@charset "UTF-8";:root{--bg-void: #0a0a0a;--bg-surface: #121212;--bg-elevated: #1e1e1e;--bg-subtle: #2a2a2a;--text-primary: #f0f0f0;--text-secondary: #b0b0b0;--text-muted: #8a8a8a;--text-dim: #505050;--accent-amber: #fbbf24;--accent-green: #22c55e;--accent-red: #ef4444;--quiz-level-c: #2196F3;--quiz-level-b: #FF9800;--quiz-level-a: #9C27B0;--border-primary: #333333;--border-subtle: #1f1f1f;--border-style-default: solid;--overlay-light: rgba(0, 0, 0, .5);--overlay-medium: rgba(0, 0, 0, .7);--overlay-dark: rgba(0, 0, 0, .95);--primary-color: #4a90e2;--secondary-color: var(--accent-amber);--accent-color: var(--accent-green);--success-color: #28a745;--danger-color: #dc3545;--warning-color: var(--accent-amber);--info-color: #17a2b8;--light-color: var(--bg-subtle);--dark-color: var(--text-primary);--text-color: var(--text-primary);--border-color: var(--border-primary);--sidebar-bg: var(--bg-elevated);--background-secondary: var(--bg-subtle);--background-light: var(--bg-surface);--btn-bg-primary: var(--bg-subtle);--btn-bg-primary-alt: var(--bg-subtle);--btn-bg-cta: #4CAF50;--btn-bg-success: #28a745;--btn-bg-danger: #dc3545;--btn-bg-success-hover: #218838;--btn-bg-danger-hover: #c82333;--btn-bg-cancel: #6c757d;--btn-bg-cancel-hover: #5a6268;--btn-bg-accept-hover: #16a34a;--gradient-primary: var(--btn-bg-primary);--gradient-primary-horizontal: var(--btn-bg-primary-alt);--gradient-secondary: var(--btn-bg-cta);--gradient-success: var(--btn-bg-success);--gradient-danger: var(--btn-bg-danger);--btn-primary-bg: var(--btn-bg-primary);--btn-primary-shadow: rgba(0, 0, 0, .3);--btn-primary-shadow-hover: rgba(0, 0, 0, .4);--btn-secondary-bg: transparent;--btn-secondary-color: var(--secondary-color);--btn-secondary-border: var(--secondary-color);--btn-danger-bg: var(--btn-bg-danger);--btn-danger-shadow: rgba(220, 53, 69, .3);--btn-danger-shadow-hover: rgba(220, 53, 69, .4);--btn-cta-bg: var(--btn-bg-cta);--btn-cta-color: #4CAF50;--btn-cta-shadow: rgba(76, 175, 80, .5);--shadow-void: 0 2px 4px rgba(0, 0, 0, .9);--shadow-surface: 0 4px 12px rgba(0, 0, 0, .5);--shadow-elevated: 0 8px 24px rgba(0, 0, 0, .2);--shadow-color-success-light: rgba(40, 167, 69, .3);--shadow-color-success-medium: rgba(40, 167, 69, .4);--shadow-color-success-strong: rgba(40, 167, 69, .5);--shadow-color-success-subtle: rgba(40, 167, 69, .05);--shadow-color-success-faint: rgba(40, 167, 69, .1);--shadow-color-success-solid: rgba(40, 167, 69, .95);--shadow-color-secondary-subtle: rgba(108, 117, 125, .1);--shadow-color-secondary-light: rgba(108, 117, 125, .3);--shadow-color-secondary-medium: rgba(108, 117, 125, .4);--shadow-sm: 0 .125rem .25rem rgba(0, 0, 0, .075);--shadow: 0 .5rem 1rem rgba(0, 0, 0, .15);--shadow-lg: 0 1rem 3rem rgba(0, 0, 0, .175);--shadow-terminal: 0 4px 20px rgba(0, 0, 0, .3);--z-base: 1;--z-raised: 10;--z-dropdown: 100;--z-sticky: 500;--z-navigation: 900;--z-modal: 1000;--z-toast: 9000;--z-max: 10000;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 1.875rem;--font-size-4xl: 2.25rem;--font-size-5xl: 3rem;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--spacing-3xl: 4rem;--spacing-section: 4rem;--radius-sm: 0;--radius-md: 0;--radius-lg: 0;--radius-xl: 0;--radius-full: 50%;--radius-circle: 50%;--bp-sm: 576px;--bp-md: 768px;--bp-lg: 992px;--bp-xl: 1200px;--terminal-bg: #121212;--terminal-bg-solid: #121212;--terminal-text: #d4d4d4;--terminal-text-white: #ffffff;--terminal-text-green: #00ff00;--terminal-prompt: #4CAF50;--terminal-border: rgba(255, 255, 255, .1);--terminal-header-bg: #2d2d2d;--terminal-dot-red: #ff6b5d;--terminal-dot-yellow: #ffc843;--terminal-dot-green: #32d74b;--terminal-header-border: #404040;--terminal-btn-bg: #3d3d3d;--terminal-btn-bg-hover: #4d4d4d;--terminal-btn-text: #888888;--terminal-btn-text-hover: #aaaaaa;--terminal-output: #00D084;--terminal-success: #4ade80;--terminal-error: #ff6b6b;--terminal-info: #60a5fa;--terminal-file-list: #87ceeb;--transition-fast: .15s ease;--transition-normal: .15s ease;--transition-slow: .3s ease;--animation-fast: .3s;--animation-normal: .6s;--animation-slow: .8s;--animation-pulse: 2s;--feedback-success-bg: #10b981;--feedback-success-icon: #4ade80;--feedback-error-bg: #ef4444;--feedback-error-icon: #f87171;--hint-color-rgb: 251, 191, 36;--hint-button-bg: #fbbf24;--hint-button-bg-hover: #f59e0b;--hint-button-text: #1a1a1a;--hint-button-shadow: rgba(var(--hint-color-rgb), .4);--progress-bar-bg: rgba(255, 255, 255, .2);--progress-bar-fill: #4ade80;--progress-text-color: #6b7280;--progress-text-highlight: #10b981;--next-lesson-bg: #22c55e;--next-lesson-bg-hover: #16a34a;--next-lesson-shadow: rgba(34, 197, 94, .4);--shadow-green-subtle: rgba(0, 208, 132, .1);--shadow-green-light: rgba(0, 208, 132, .3);--shadow-green-medium: rgba(0, 208, 132, .4)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes successPulse{0%{transform:translate(-50%,-50%) scale(.5);opacity:0}50%{transform:translate(-50%,-50%) scale(1.1);opacity:1}to{transform:translate(-50%,-50%) scale(1);opacity:1}}@keyframes cta-pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes cursor-blink{0%,50%{opacity:1}51%,to{opacity:0}}@keyframes checkmark-draw{0%{stroke-dashoffset:50}to{stroke-dashoffset:0}}@keyframes success-circle-scale{0%{transform:scale(0);opacity:0}50%{transform:scale(1.1);opacity:1}to{transform:scale(1);opacity:1}}@keyframes progressFloat{0%,to{transform:translateY(0) rotate(0)}25%{transform:translateY(-3px) rotate(1deg)}75%{transform:translateY(-2px) rotate(-1deg)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInRight{0%{opacity:0;transform:translate(30px)}to{opacity:1;transform:translate(0)}}@keyframes slideIn{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes runningMotion{0%,to{transform:translate(0) scale(1)}25%{transform:translate(-2px) scale(1.02)}75%{transform:translate(2px) scale(.98)}}@keyframes gentleBounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes shimmer{0%{left:-100%}to{left:100%}}@keyframes modalSlideIn{0%{transform:translateY(-50px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes celebrationFadeIn{0%{opacity:0}to{opacity:1}}@keyframes celebrationSlideIn{0%{opacity:0;transform:translateY(-50px) scale(.9)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes celebrationImageBounce{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.balus-modal{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#000000e6;display:flex;justify-content:center;align-items:center;z-index:9999;opacity:0;pointer-events:none;transition:opacity .5s ease}.balus-modal.show{opacity:1;pointer-events:all}.balus-image{max-width:80vw;max-height:80vh;object-fit:contain;animation:balus-appear .8s ease-out}@keyframes balus-appear{0%{transform:scale(.3) rotate(-10deg);opacity:0}50%{transform:scale(1.1) rotate(5deg);opacity:.8}to{transform:scale(1) rotate(0);opacity:1}}.blue-radial-light{position:absolute;top:55%;left:45%;transform:translate(-50%,-50%);width:50px;height:50px;border-radius:50%;background:#3b82f699;opacity:0;z-index:9998;pointer-events:none}.blue-radial-light.active{animation:blue-light-expand 2s ease-out forwards}@keyframes blue-light-expand{0%{opacity:0;transform:translate(-50%,-50%) scale(0)}20%{opacity:1;transform:translate(-50%,-50%) scale(1)}40%{opacity:.8;transform:translate(-50%,-50%) scale(5)}60%{opacity:.6;transform:translate(-50%,-50%) scale(10)}80%{opacity:.3;transform:translate(-50%,-50%) scale(20);box-shadow:0 0 100px #0096ff99}to{opacity:0;transform:translate(-50%,-50%) scale(30);box-shadow:0 0 200px #0096ff33}}.blue-radial-light:before,.blue-radial-light:after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);border-radius:50%;background:#3b82f666}.blue-radial-light:before{width:80px;height:80px;animation:blue-light-pulse-1 2s ease-out .3s forwards}.blue-radial-light:after{width:120px;height:120px;animation:blue-light-pulse-2 2s ease-out .6s forwards}@keyframes blue-light-pulse-1{0%{opacity:0;transform:translate(-50%,-50%) scale(0)}30%{opacity:.8;transform:translate(-50%,-50%) scale(1)}70%{opacity:.4;transform:translate(-50%,-50%) scale(8)}to{opacity:0;transform:translate(-50%,-50%) scale(15)}}@keyframes blue-light-pulse-2{0%{opacity:0;transform:translate(-50%,-50%) scale(0)}40%{opacity:.6;transform:translate(-50%,-50%) scale(1)}80%{opacity:.2;transform:translate(-50%,-50%) scale(6)}to{opacity:0;transform:translate(-50%,-50%) scale(12)}}.jewel-octahedron{position:absolute;left:50%;bottom:-100px;width:80px;height:80px;transform:translate(-50%);z-index:9999;pointer-events:none;opacity:0}.jewel-octahedron.active{animation:jewel-ascend 3s linear forwards}.jewel-cube{position:relative;width:120px;height:120px;transform-style:preserve-3d;transform:rotateX(45deg) rotateY(45deg);animation:jewel-rotate 2s linear infinite}.cube-face{position:absolute;width:120px;height:120px;background:#1e3a8ab3;border:2px solid rgba(30,58,138,.6);box-shadow:inset 0 0 15px #fff3,inset 0 5px 2px #fff6,0 0 35px #1e3a8acc,0 0 5px #1e3a8a66;-webkit-backdrop-filter:blur(1px);backdrop-filter:blur(1px)}.cube-front{transform:translateZ(60px);opacity:.9;filter:brightness(1.2);box-shadow:inset 0 0 30px #ffffff80,0 0 40px #1e3a8a,0 0 80px #1e3a8a80}.cube-back{transform:rotateY(180deg) translateZ(60px);opacity:.3;filter:brightness(.7)}.cube-right{transform:rotateY(90deg) translateZ(60px);opacity:.75;filter:brightness(1)}.cube-left{transform:rotateY(-90deg) translateZ(60px);opacity:.65;filter:brightness(.9)}.cube-top{transform:rotateX(90deg) translateZ(60px);opacity:.8;filter:brightness(1.1);box-shadow:inset 0 0 25px #fff6,0 0 35px #1e3a8ae6,0 0 70px #1e3a8a66}.cube-bottom{transform:rotateX(-90deg) translateZ(60px);opacity:.5;filter:brightness(.8)}@keyframes jewel-ascend{0%{opacity:0;bottom:-100px;filter:blur(0px);box-shadow:0 0 50px #1e3a8acc}10%{opacity:1;filter:blur(0px);box-shadow:0 0 80px #1e3a8ae6}50%{opacity:1;filter:blur(1px);box-shadow:0 0 120px #1e3a8a}90%{opacity:.8;filter:blur(2px);box-shadow:0 0 150px #1e3a8a99}to{opacity:0;bottom:120vh;filter:blur(3px);box-shadow:0 0 200px #1e3a8a4d}}@keyframes jewel-rotate{0%{transform:rotateX(45deg) rotateY(45deg) rotate(0)}25%{transform:rotateX(135deg) rotateY(135deg) rotate(90deg)}50%{transform:rotateX(225deg) rotateY(225deg) rotate(180deg)}75%{transform:rotateX(315deg) rotateY(315deg) rotate(270deg)}to{transform:rotateX(405deg) rotateY(405deg) rotate(360deg)}}.jewel-octahedron:before{content:"";position:absolute;top:50%;left:50%;width:100px;height:100px;transform:translate(-50%,-50%);background:#22d3ee33;border-radius:50%;animation:jewel-energy-pulse .8s ease-in-out infinite alternate;z-index:-1;filter:blur(1px)}.jewel-octahedron:after{content:"";position:absolute;top:50%;left:50%;width:150px;height:150px;transform:translate(-50%,-50%);background:#22d3ee1a;border-radius:50%;animation:jewel-energy-pulse 1.2s ease-in-out infinite alternate;z-index:-2;filter:blur(2px)}@keyframes jewel-energy-pulse{0%{opacity:.3;transform:translate(-50%,-50%) scale(.8)}to{opacity:.8;transform:translate(-50%,-50%) scale(1.2)}}@media(max-width:768px){.jewel-octahedron{width:60px;height:60px}.jewel-octahedron:before{width:100px;height:100px}.jewel-octahedron:after{width:160px;height:160px}}@media(max-width:420px){.jewel-octahedron{width:50px;height:50px}.jewel-octahedron:before{width:80px;height:80px}.jewel-octahedron:after{width:120px;height:120px}}.balus-destruction-mode{overflow:hidden!important;position:relative}.balus-collapse-1{animation:balus-shake .8s ease-in-out}.balus-collapse-2{animation:balus-tilt 1.2s ease-in-out forwards}.balus-collapse-3{animation:balus-fall 1.5s ease-in forwards}.balus-collapse-final{animation:balus-disintegrate 2s ease-in forwards}@keyframes balus-shake{0%,to{transform:translate(0) rotate(0)}10%{transform:translate(-2px,-1px) rotate(-.5deg)}20%{transform:translate(2px,1px) rotate(.5deg)}30%{transform:translate(-1px,2px) rotate(-.3deg)}40%{transform:translate(1px,-2px) rotate(.3deg)}50%{transform:translate(-2px,1px) rotate(-.2deg)}60%{transform:translate(2px,-1px) rotate(.2deg)}70%{transform:translate(-1px,-2px) rotate(-.1deg)}80%{transform:translate(1px,2px) rotate(.1deg)}90%{transform:translate(-2px,-1px) rotate(-.05deg)}}@keyframes balus-tilt{0%{transform:rotate(0) scale(1);opacity:1}25%{transform:rotate(-2deg) scale(.98);opacity:.9}50%{transform:rotate(3deg) scale(.95);opacity:.8}75%{transform:rotate(-5deg) scale(.9);opacity:.7}to{transform:rotate(-8deg) scale(.85);opacity:.6}}@keyframes balus-fall{0%{transform:rotate(-8deg) scale(.85) translateY(0);opacity:.6}30%{transform:rotate(-15deg) scale(.7) translateY(50px);opacity:.5}60%{transform:rotate(-25deg) scale(.5) translateY(200px);opacity:.3}to{transform:rotate(-45deg) scale(.2) translateY(1000px);opacity:0}}@keyframes balus-disintegrate{0%{transform:scale(1) rotate(0);opacity:1;filter:blur(0px)}25%{transform:scale(.9) rotate(-5deg);opacity:.8;filter:blur(1px)}50%{transform:scale(.7) rotate(-15deg);opacity:.6;filter:blur(3px)}75%{transform:scale(.4) rotate(-30deg);opacity:.3;filter:blur(5px)}to{transform:scale(0) rotate(-90deg) translateY(2000px);opacity:0;filter:blur(10px)}}.balus-glitch{animation:balus-glitch-effect .3s infinite}@keyframes balus-glitch-effect{0%{transform:translate(0);filter:hue-rotate(0deg)}20%{transform:translate(-2px,2px);filter:hue-rotate(90deg)}40%{transform:translate(-2px,-2px);filter:hue-rotate(180deg)}60%{transform:translate(2px,2px);filter:hue-rotate(270deg)}80%{transform:translate(2px,-2px);filter:hue-rotate(360deg)}to{transform:translate(0);filter:hue-rotate(0deg)}}.balus-crash-screen{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#000;color:#f44;display:flex;flex-direction:column;justify-content:flex-start;align-items:center;z-index:10000;font-family:Courier New,monospace;font-size:1.5rem;text-align:center;opacity:0;pointer-events:none;transition:opacity .5s ease;overflow-y:auto;overflow-x:hidden;padding:2rem 1rem;box-sizing:border-box}.balus-crash-screen.show{opacity:1;pointer-events:all}.balus-crash-title{font-size:3rem;font-weight:700;margin-bottom:1rem;animation:balus-crash-blink 1s infinite;padding:1rem 0;background:#000c;border-radius:0;text-shadow:0 0 20px rgba(255,68,68,.8);border:2px solid rgba(255,68,68,.3)}.balus-crash-message{font-size:1.2rem;margin-bottom:2rem;line-height:1.6}@keyframes balus-crash-blink{0%,50%{opacity:1}51%,to{opacity:.3}}.balus-command-explanation{margin-top:3rem;padding:2rem;background:#ffffff0d;border:2px solid #ff6666;border-radius:0;max-width:800px;opacity:0;transform:translateY(20px);animation:explanationFadeIn 1s ease-out 2s forwards}.command-explanation-title{font-size:1.8rem;font-weight:700;color:#ff0;margin-bottom:1.5rem;text-align:center;text-shadow:0 0 10px rgba(255,255,0,.5)}.command-breakdown{background:#000c;padding:1.5rem;border-radius:0;border-left:4px solid #ff4444}.command-line{font-size:1.6rem;font-weight:700;color:#0f0;margin-bottom:1.5rem;padding:.8rem;background:#000000e6;border-radius:0;border:1px solid #00ff00;text-shadow:0 0 8px rgba(0,255,0,.6);letter-spacing:2px}.command-parts{margin-bottom:1.5rem}.command-part{display:flex;align-items:center;margin:.8rem 0;padding:.6rem;background:#ffffff08;border-radius:0;border-left:3px solid transparent;transition:all .3s ease}.command-part:nth-child(1){border-left-color:#ff6b5d;animation-delay:2.2s}.command-part:nth-child(2){border-left-color:#ffc843;animation-delay:2.4s}.command-part:nth-child(3){border-left-color:#32d74b;animation-delay:2.6s}.command-part:nth-child(4){border-left-color:#007aff;animation-delay:2.8s}.command-part:nth-child(5){border-left-color:#af52de;animation-delay:3s}.command-token{font-family:Courier New,monospace;font-weight:700;padding:.3rem .8rem;border-radius:0;margin-right:1.2rem;min-width:80px;text-align:center;font-size:1.1rem}.command-token.sudo,.command-token.rm{background:var(--accent-red);color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.5)}.command-token.option{background:var(--accent-green);color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.5)}.command-token.path{background:#8b5cf6;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.5)}.command-desc{flex:1;color:#ccc;font-size:1.1rem;line-height:1.4}.command-result{display:flex;align-items:center;margin-top:1.5rem;padding:1rem;background:#ef444426;border:2px solid #ff4444;border-radius:0;animation:resultPulse 2s ease-in-out infinite 3.5s}.result-arrow{font-size:1.5rem;color:#f44;margin-right:1rem;text-shadow:0 0 10px rgba(255,68,68,.8)}.result-text{font-size:1.3rem;font-weight:700;color:#f66;text-shadow:0 0 8px rgba(255,102,102,.6)}@keyframes explanationFadeIn{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes resultPulse{0%,to{box-shadow:0 0 20px #ff44444d;border-color:#f44}50%{box-shadow:0 0 40px #f44c;border-color:#f66}}.glider-flyby{position:absolute;width:128px;height:128px;top:50%;right:-150px;z-index:10001;opacity:0;transform-origin:center center;pointer-events:none}.glider-flyby.flying{animation:glider-flyby-animation 5s linear forwards}@keyframes glider-flyby-animation{0%{transform:translate(0) translateY(0) rotate(0);right:-150px;opacity:0}3%{opacity:1}10%{transform:translate(-300px) translateY(15px) rotate(-2deg)}25%{transform:translate(-600px) translateY(25px) rotate(-3deg)}50%{transform:translate(-900px) translateY(35px) rotate(-2deg)}75%{transform:translate(-1200px) translateY(45px) rotate(-1deg);opacity:.8}90%{transform:translate(-1400px) translateY(50px) rotate(0);opacity:.4}to{transform:translate(-1600px) translateY(55px) rotate(0);opacity:0}}@media(max-width:768px){.balus-image{max-width:90vw;max-height:70vh}.blue-radial-light{top:54%;left:44%}.balus-crash-screen{padding:1.5rem .8rem;font-size:1.3rem}.balus-crash-title{font-size:2rem;margin-bottom:1.5rem;padding:1rem 0;background:#000000e6;border-radius:0;position:sticky;top:0;z-index:1}.balus-crash-message{font-size:1rem;padding:0 1rem;margin-bottom:1.5rem}.balus-command-explanation{margin-top:2rem;padding:1.5rem;max-width:95vw}.command-explanation-title{font-size:1.4rem;margin-bottom:1rem}.command-breakdown{padding:1rem}.command-line{font-size:1.2rem;padding:.6rem;letter-spacing:1px}.command-part{flex-direction:column;align-items:flex-start;margin:.6rem 0;padding:.8rem}.command-token{margin-right:0;margin-bottom:.5rem;min-width:auto;padding:.4rem .6rem;font-size:1rem}.command-desc{font-size:1rem;margin-left:0}.command-result{padding:.8rem;flex-direction:column;text-align:center}.result-arrow{margin-right:0;margin-bottom:.5rem}.result-text{font-size:1.1rem}}@media(max-width:420px){.blue-radial-light{top:53%;left:45%}.balus-crash-screen{padding:1rem .5rem;font-size:1.2rem}.balus-crash-title{font-size:1.6rem;margin-bottom:1rem;padding:.8rem 0}.balus-crash-message{font-size:.9rem;margin-bottom:1rem}.balus-command-explanation{padding:1rem;margin-top:1.5rem}.command-explanation-title{font-size:1.2rem;line-height:1.3}.command-line{font-size:1.1rem;padding:.5rem;word-break:break-all}.command-token{font-size:.9rem;padding:.3rem .5rem}.command-desc{font-size:.95rem;line-height:1.3}.result-text{font-size:1rem;line-height:1.3}}@media(max-width:768px){.glider-flyby{top:60%;width:100px;height:100px}}@media(max-width:420px){.glider-flyby{top:70%;width:80px;height:80px}}.collapse-hinge{animation:hingeCollapse 2s ease-in-out forwards;transform-origin:top left}@keyframes hingeCollapse{0%{transform-origin:top left;animation-timing-function:ease-in-out}20%,60%{transform:rotate3d(0,0,1,80deg);transform-origin:top left;animation-timing-function:ease-in-out}40%,80%{transform:rotate3d(0,0,1,60deg);transform-origin:top left;animation-timing-function:ease-in-out;opacity:1}to{transform:translate3d(0,700px,0);opacity:0}}.collapse-hinge-left{animation:hingeCollapseLeft 1.8s ease-in-out forwards;transform-origin:top left}.collapse-hinge-right{animation:hingeCollapseRight 1.8s ease-in-out forwards;transform-origin:top right}@keyframes hingeCollapseLeft{0%{transform-origin:top left}20%,60%{transform:rotate3d(0,0,1,80deg);transform-origin:top left}40%,80%{transform:rotate3d(0,0,1,60deg);transform-origin:top left;opacity:1}to{transform:translate3d(-100px,700px,0) rotate3d(0,0,1,90deg);opacity:0}}@keyframes hingeCollapseRight{0%{transform-origin:top right}20%,60%{transform:rotate3d(0,0,1,-80deg);transform-origin:top right}40%,80%{transform:rotate3d(0,0,1,-60deg);transform-origin:top right;opacity:1}to{transform:translate3d(100px,700px,0) rotate3d(0,0,1,-90deg);opacity:0}}.collapse-delay-1{animation-delay:.1s}.collapse-delay-2{animation-delay:.2s}.collapse-delay-3{animation-delay:.3s}.collapse-delay-4{animation-delay:.4s}.collapse-delay-5{animation-delay:.5s}.collapse-delay-6{animation-delay:.6s}.collapse-delay-7{animation-delay:.7s}.collapse-delay-8{animation-delay:.8s}.collapse-small{--collapse-distance: 500px}.collapse-medium{--collapse-distance: 700px}.collapse-large{--collapse-distance: 900px}.collapse-hinge,.collapse-hinge-left,.collapse-hinge-right{will-change:transform,opacity;backface-visibility:hidden;perspective:1000px}@media(prefers-reduced-motion:reduce){.balus-modal,.balus-collapse-1,.balus-collapse-2,.balus-collapse-3,.balus-collapse-final,.balus-glitch,.balus-crash-screen,.glider-flyby{animation:none!important;transition:none!important}.glider-flyby{display:none}.balus-modal.show,.balus-crash-screen.show{opacity:1}}html{color-scheme:dark}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:var(--bg-void);color:var(--text-primary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--accent-amber);text-decoration:underline;transition:color .15s ease}a:visited{color:var(--accent-amber)}a:hover{color:var(--text-primary)}.header{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background:var(--btn-bg-primary);color:#fff;box-shadow:var(--shadow-void)}.logo{font-size:1.5rem;font-weight:700;display:flex;align-items:center}.logo a{color:#fff;text-decoration:none;border:none;display:flex;align-items:center}.logo a:hover,.logo a:visited,.logo a:active,.logo a:focus{color:#fff;text-decoration:none;border:none;outline:none}.logo-image{height:50px;width:auto;transition:transform .15s ease;filter:brightness(0) invert(1)}.logo-image:hover{transform:scale(1.05)}.progress-mascot{text-align:center;margin:1rem 0}.progress-penguin-image{max-width:80px;height:auto;border-radius:0;box-shadow:0 4px 12px #0000001a;animation:progressFloat 4s ease-in-out infinite;transition:transform .15s ease}.progress-penguin-image:hover{transform:scale(1.1)}.footer-content{max-width:1200px;margin:0 auto;padding:0 2rem;text-align:center}.footer-columns{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem;margin-bottom:2rem}.footer-links{margin-bottom:1rem}.footer-link{color:var(--accent-green);text-decoration:none;margin:0 1rem;font-size:.9rem;transition:color var(--transition-fast)}.footer-link:hover{color:var(--text-primary);text-decoration:underline}.footer-column h3{color:var(--text-primary);margin-bottom:1rem;font-size:1.1rem;font-weight:600}.footer-column ul{list-style:none;padding:0;margin:0}.footer-column li{margin-bottom:.5rem}.footer-column a{color:var(--text-muted);text-decoration:none;transition:color var(--transition-fast);font-size:.9rem}.footer-column a:hover{color:var(--text-primary);text-decoration:underline}.footer-bottom{border-top:1px solid var(--border-subtle);padding-top:1.5rem;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}.footer-copyright{font-size:.8rem;color:var(--accent-green);opacity:.8}.footer-copyright p{margin:0;font-size:.85rem;color:var(--text-muted)}.footer-social{display:flex;gap:1rem;align-items:center}.footer-divider{border:none;height:1px;background:var(--border-subtle);margin:1rem 0}.footer-noscript{background:var(--bg-void);padding:2rem 1rem;text-align:center;color:var(--text-primary)}.footer-noscript nav{margin-bottom:1rem}.footer-noscript nav a{color:var(--accent-amber);text-decoration:none;margin:0 .5rem;padding:.25rem .5rem}.footer-noscript nav a:hover{text-decoration:underline}.footer-noscript nav a:focus-visible{outline:2px solid var(--accent-amber);outline-offset:2px}.footer-noscript p{color:var(--text-secondary);margin:0;font-size:.85rem}.main-nav{display:flex;align-items:center;gap:2rem}.nav-link{color:#fff;text-decoration:none;padding:.5rem 1rem;border-radius:0;transition:all var(--transition-fast);font-weight:500}.nav-link:hover{background:var(--bg-subtle);color:var(--text-primary)}.nav-link.active{background:var(--bg-elevated);color:var(--accent-amber)}.nav-dropdown{position:relative}.nav-dropdown:before{content:"";position:absolute;top:100%;left:0;right:0;height:.25rem;background:transparent;z-index:calc(var(--z-modal) - 1)}.nav-dropdown:hover .dropdown-toggle:after{transform:rotate(180deg)}.nav-dropdown:hover .dropdown-content{display:block;opacity:1;transform:translateY(0)}.dropdown-toggle{cursor:pointer}.dropdown-toggle:after{content:" ▼";font-size:.8rem;margin-left:.5rem;transition:transform var(--transition-fast)}.dropdown-content{display:none;position:absolute;top:100%;left:0;min-width:250px;background:var(--bg-surface);border-radius:0;box-shadow:var(--shadow-surface);border:1px solid var(--border-subtle);z-index:var(--z-modal);margin-top:.25rem;opacity:0;transform:translateY(-10px);transition:all var(--transition-fast)}.dropdown-content:hover{display:block;opacity:1;transform:translateY(0)}.dropdown-content a{display:block;padding:.75rem 1rem;color:var(--text-secondary);text-decoration:none;transition:background var(--transition-fast);border-bottom:1px solid var(--border-subtle)}.dropdown-content a:hover{background:var(--bg-subtle);color:var(--text-primary)}.dropdown-content a:last-child{border-bottom:none}.dropdown-content a.active{background:var(--bg-subtle);color:var(--accent-amber);font-weight:600}.main-nav .dropdown-content{min-width:200px;margin-top:.5rem}.nav-dropdown ul,.dropdown-content,.sidebar ul{list-style:none;padding:0;margin:0}.nav-dropdown li,.dropdown-content li,.sidebar li{margin-bottom:0}.hamburger-menu{display:none;background:none;border:none;cursor:pointer;padding:10px;flex-direction:column;justify-content:space-between;width:30px;height:30px;position:relative}.hamburger-line{display:block;width:100%;height:3px;background-color:#fff;border-radius:0;transition:transform var(--transition-fast),opacity var(--transition-fast);position:absolute;left:0}.hamburger-line:nth-child(1){top:0}.hamburger-line:nth-child(2){top:50%;transform:translateY(-50%)}.hamburger-line:nth-child(3){bottom:0}.hamburger-menu.active .hamburger-line:nth-child(1){transform:translateY(13px) rotate(45deg)}.hamburger-menu.active .hamburger-line:nth-child(3){transform:translateY(-13px) rotate(-45deg)}.mobile-menu-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:var(--overlay-light);z-index:calc(var(--z-navigation) - 1);opacity:0;transition:opacity var(--transition-fast)}.mobile-menu-overlay.active{display:block;opacity:1}.mobile-menu{position:fixed;top:0;right:-100%;width:300px;max-width:80%;height:100%;background:var(--bg-surface);box-shadow:-2px 0 10px #0000004d;transition:right var(--transition-fast);z-index:var(--z-navigation);overflow-y:auto}.mobile-menu-header{display:flex;justify-content:space-between;align-items:center;padding:1rem;background:var(--btn-bg-primary);color:#fff}.mobile-menu-header h3{margin:0;font-size:1.2rem}.mobile-menu-close{background:none;border:none;color:#fff;font-size:2rem;cursor:pointer;padding:0;width:30px;height:30px;display:flex;align-items:center;justify-content:center;line-height:1}.mobile-menu-content{padding:1rem}.mobile-nav-section{margin-bottom:1.5rem}.mobile-nav-section h4{color:var(--accent-amber);font-size:.9rem;font-weight:600;margin-bottom:.5rem;padding-bottom:.5rem;border-bottom:1px solid var(--border-color)}.mobile-nav-link{display:block;padding:.75rem .5rem;color:var(--text-color);text-decoration:none;transition:background-color var(--transition-fast);border-radius:0}.mobile-nav-link:hover{background-color:var(--light-color)}.mobile-progress-info{padding:.5rem;background-color:var(--light-color);border-radius:0}.mobile-progress-info p{margin:.25rem 0;font-size:.9rem}.mobile-nav-footer{margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border-color);text-align:center}.mobile-nav-footer a{color:var(--accent-amber);text-decoration:none}.sidebar{width:320px;background:var(--bg-surface);padding:1.5rem;overflow:hidden;border-right:1px solid var(--border-primary);box-shadow:var(--shadow-surface);display:flex;flex-direction:column}.sidebar h2{margin-bottom:1rem;color:var(--text-primary);font-size:1.2rem}@media(max-width:768px){.sidebar{width:100%;order:2;max-height:50vh}}.success-message{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--feedback-success-bg);color:#fff;padding:2rem 3rem;border-radius:0;font-size:1.25rem;font-weight:600;text-align:center;z-index:1000;box-shadow:var(--shadow-elevated);animation:successPulse var(--animation-slow) ease-out;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.success-feedback{display:flex;flex-direction:column;align-items:center;gap:1rem}.success-checkmark{width:60px;height:60px;animation:success-circle-scale var(--animation-fast) ease-out}.success-checkmark .checkmark-circle{fill:none;stroke:var(--feedback-success-icon);stroke-width:3;stroke-linecap:round}.success-checkmark .checkmark-check{fill:none;stroke:#fff;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:50;stroke-dashoffset:50;animation:checkmark-draw var(--animation-fast) ease-out var(--animation-fast) forwards}.error-feedback{display:flex;align-items:center;gap:.5rem;background:var(--feedback-error-bg);color:#fff;padding:1rem 1.5rem;border-radius:0;margin-top:.5rem}.error-feedback .error-icon{font-size:1.25rem}.error-feedback .hint-link{color:var(--text-primary);text-decoration:underline;cursor:pointer}.error-feedback .hint-link:hover{color:#fff}.difficulty-badge{display:inline-block;padding:.25rem .5rem;border-radius:0;font-size:.75rem;font-weight:600;text-transform:uppercase;background:var(--bg-elevated);color:var(--text-primary);border-style:var(--border-style-default);border-color:var(--text-secondary)}.difficulty-indicator{margin-right:var(--spacing-xs);font-size:.7em;letter-spacing:-.1em}.progress-bar{width:100%;height:8px;background:#fff3;border-radius:0;overflow:hidden;margin:.5rem 0}.progress-fill{height:100%;background:var(--accent-green);border-radius:0;transition:width var(--transition-slow);width:0%}.progress-fill[data-width="100"]{width:100%}.progress-fill[data-width="90"]{width:90%}.progress-fill[data-width="85"]{width:85%}.progress-fill[data-width="80"]{width:80%}.progress-fill[data-width="75"]{width:75%}.progress-fill[data-width="70"]{width:70%}.progress-fill[data-width="60"]{width:60%}.progress-fill[data-width="50"]{width:50%}.progress-fill[data-width="40"]{width:40%}.progress-fill[data-width="30"]{width:30%}.progress-fill[data-width="25"]{width:25%}.progress-fill[data-width="20"]{width:20%}.progress-fill[data-width="10"]{width:10%}.badge-count{color:var(--accent-green);font-weight:600;font-size:1.125rem}.header-progress{display:flex;align-items:center;gap:1rem;padding:.5rem 1rem;background:var(--background-secondary);border-radius:0}.header-progress-bar{width:120px;height:6px;background:var(--progress-bar-bg);border-radius:0;overflow:hidden}@media(max-width:767px){.header-progress-bar{width:80px}}.header-progress-fill{height:100%;background:var(--progress-bar-fill);border-radius:0;transition:width var(--transition-slow)}.header-progress-text{font-size:.875rem;color:var(--progress-text-color);white-space:nowrap}.header-progress-text .progress-count{font-weight:600;color:var(--progress-text-highlight)}.header-progress-text .progress-total{color:var(--text-muted)}@media(max-width:575px){.header-progress-text{font-size:.75rem}}.lesson-complete-badge{display:inline-flex;align-items:center;gap:.25rem;padding:.25rem .5rem;background:#22c55e1a;color:var(--progress-text-highlight);font-size:.75rem;font-weight:600;border-radius:0;border:1px solid rgba(34,197,94,.3)}.lesson-complete-badge:before{content:"✓"}.cta-button,.hero-button{padding:1rem 3rem;font-size:1.125rem;border-radius:0;text-decoration:none;transition:var(--transition-normal);display:inline-block;border:none;cursor:pointer;font-weight:500}.cta-button:hover,.hero-button:hover{transform:translateY(-2px);box-shadow:var(--shadow-elevated)}.cta-button-large{background:var(--bg-elevated);color:var(--text-primary);font-weight:700;border:1px solid var(--accent-amber)}.cta-button-large:hover{background:var(--bg-subtle);border-color:var(--accent-green)}.cta-button-secondary,.hero-button-secondary{background:transparent;color:var(--text-secondary);border:1px solid var(--border-primary)}.cta-button-secondary:hover,.hero-button-secondary:hover{background:var(--bg-elevated);color:var(--text-primary)}.hero-button-cta{background:var(--btn-cta-bg);color:#fff;font-size:1.3rem;padding:1.3rem 3rem;box-shadow:0 6px 20px var(--btn-cta-shadow);animation:cta-pulse var(--animation-pulse) ease-in-out infinite;position:relative;overflow:hidden;font-weight:700;letter-spacing:.5px}.hero-button-cta:before{content:"";position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:#ffffff4d;transform:translate(-50%,-50%);transition:width var(--animation-normal),height var(--animation-normal)}.hero-button-cta:hover:before{width:300px;height:300px}.hero-button-cta:hover{transform:translateY(-3px);box-shadow:0 8px 25px var(--btn-cta-shadow)}@media(max-width:767px){.hero-button-cta{font-size:1.1rem;padding:1rem 2rem;width:100%;text-align:center}}.hero-buttons,.action-buttons{display:flex;gap:2rem;justify-content:center;flex-wrap:wrap}@media(max-width:767px){.hero-buttons,.action-buttons{gap:1rem}}.action-buttons{gap:1rem}.btn-primary{display:inline-flex;align-items:center;justify-content:center;padding:.5rem 1.5rem;font-size:1rem;font-weight:600;text-decoration:none;border:none;border-radius:0;cursor:pointer;transition:all var(--transition-normal)}.btn-primary:hover{transform:translateY(-2px)}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}.btn-primary{background:var(--btn-primary-bg);color:#fff;box-shadow:0 4px 15px var(--btn-primary-shadow)}.btn-primary:hover{box-shadow:0 8px 25px var(--btn-primary-shadow-hover)}.btn-primary{padding:.5rem 2rem}.btn-secondary{display:inline-flex;align-items:center;justify-content:center;padding:.5rem 1.5rem;font-size:1rem;font-weight:600;text-decoration:none;border:none;border-radius:0;cursor:pointer;transition:all var(--transition-normal)}.btn-secondary:hover{transform:translateY(-2px)}.btn-secondary:active{transform:translateY(0)}.btn-secondary:disabled{opacity:.6;cursor:not-allowed;transform:none}.btn-secondary{background:var(--btn-secondary-bg);color:var(--btn-secondary-color);border:2px solid var(--btn-secondary-border)}.btn-secondary:hover{background:var(--btn-secondary-color);color:var(--text-primary)}.btn-secondary{padding:.5rem 2rem}.btn-danger{display:inline-flex;align-items:center;justify-content:center;padding:.5rem 1.5rem;font-size:1rem;font-weight:600;text-decoration:none;border:none;border-radius:0;cursor:pointer;transition:all var(--transition-normal)}.btn-danger:hover{transform:translateY(-2px)}.btn-danger:active{transform:translateY(0)}.btn-danger:disabled{opacity:.6;cursor:not-allowed;transform:none}.btn-danger{background:var(--btn-danger-bg);color:#fff;box-shadow:0 4px 15px var(--btn-danger-shadow)}.btn-danger:hover{box-shadow:0 8px 25px var(--btn-danger-shadow-hover)}.btn-danger{padding:.5rem 2rem}.hint-button{display:inline-flex;align-items:center;gap:.5rem;padding:.5rem 1.5rem;background:var(--hint-button-bg);color:var(--hint-button-text);font-size:1rem;font-weight:600;border:none;border-radius:0;box-shadow:0 4px 12px var(--hint-button-shadow);cursor:pointer;transition:var(--transition-normal)}.hint-button:before{content:"💡";font-size:1.125rem}.hint-button:hover{background:var(--hint-button-bg-hover);transform:translateY(-2px);box-shadow:0 6px 16px var(--hint-button-shadow)}.hint-button:active{transform:translateY(0)}.hint-content{padding:1rem;margin-top:.5rem;background:rgba(var(--hint-color-rgb),.1);border:1px solid rgba(var(--hint-color-rgb),.3);border-radius:0;color:var(--text-color);font-size:.875rem;line-height:1.6}.terminal-area .hint-content{background:rgba(var(--hint-color-rgb),.15);border-color:rgba(var(--hint-color-rgb),.4);color:var(--terminal-text)}.features-section{padding:3rem 2rem;background:var(--light-color);border-radius:0;margin-bottom:3rem}@media(max-width:575px){.features-section{padding:2rem 1rem}}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:3rem;margin-top:3rem}@media(max-width:767px){.features-grid{grid-template-columns:1fr;gap:1.5rem}}.feature-card{background:var(--bg-elevated);border-radius:0;padding:1.5rem;box-shadow:0 4px 12px #0000004d;transition:all var(--transition-normal);text-align:center}.feature-icon{font-size:3rem;margin-bottom:1rem}.feature-title{font-size:1.25rem;font-weight:700;margin-bottom:.5rem;color:var(--text-color)}.feature-description{color:var(--text-muted);line-height:1.6}.hero-section{background:var(--btn-bg-primary);color:#fff;padding:4rem 2rem;text-align:center;border-radius:0;margin-bottom:3rem}@media(max-width:575px){.hero-section{padding:3rem 1rem;margin-bottom:2rem}}.hero-content{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;gap:3rem}@media(max-width:767px){.hero-content{flex-direction:column;text-align:center;gap:2rem}}.hero-text{flex:1;text-align:left}@media(max-width:767px){.hero-text{text-align:center}}.hero-image{flex:1;max-width:500px}@media(max-width:767px){.hero-image{max-width:300px;margin:0 auto;text-align:center}}.hero-main-image{width:100%;height:auto;border-radius:0}.hero-title{font-size:3rem;margin-bottom:2rem;font-weight:700}@media(max-width:767px){.hero-title{font-size:1.875rem}}.hero-subtitle{font-size:1.25rem;margin-bottom:3rem;opacity:.95}.cta-section{background:var(--bg-surface);color:var(--text-primary);padding:3rem;text-align:center;border-radius:0;margin:3rem 0;border:1px solid var(--border-subtle)}.cta-section h2{margin-bottom:1rem}.cta-section p{margin-bottom:2rem;opacity:.9}.cta-section .cta-button{background:var(--bg-elevated);color:var(--text-primary);padding:1rem 3rem;font-weight:700;border:1px solid var(--accent-amber)}.cta-section .cta-button:hover{background:var(--bg-subtle);border-color:var(--accent-green)}.verification-info{background:var(--light-color);padding:1rem;border-radius:0;margin:2rem 0;border-left:4px solid var(--secondary-color)}.verification-info h4{margin:0 0 .5rem;color:var(--text-color)}.verification-info p{margin:0;color:var(--text-muted);font-size:.875rem}.trouble-item{margin-bottom:2rem;padding:1.5rem;background:var(--background-light);border:1px solid var(--border-color);border-radius:0}details.warning-red,details.warning-yellow{margin-top:1.5rem;padding:1rem;background:var(--light-color);border-radius:0}details.warning-red summary,details.warning-yellow summary{cursor:pointer;font-weight:700}details.warning-yellow{border-left:4px solid var(--text-secondary)}details.warning-yellow summary{color:var(--text-primary)}details.warning-red{border-left:4px solid var(--danger-color)}details.warning-red summary{color:var(--danger-color)}.modal{position:fixed;top:0;left:0;width:100%;height:100%;background:var(--overlay-light);display:flex;justify-content:center;align-items:center;z-index:var(--z-modal)}.modal-content{background:var(--bg-surface);padding:2rem;border-radius:0;text-align:center;max-width:400px;animation:modalSlideIn var(--transition-fast);border:1px solid var(--border-primary)}.modal-button{padding:.75rem 2rem;border:none;border-radius:0;cursor:pointer;font-weight:500;transition:all var(--transition-fast)}.modal-button.cancel{background:var(--btn-bg-cancel);color:#fff}.modal-button.cancel:hover{background:var(--btn-bg-cancel-hover);transform:translateY(-2px)}.modal-button.confirm{background:var(--danger-color);color:#fff}.modal-button.confirm:hover{background:var(--btn-bg-danger-hover);transform:translateY(-2px)}.badge-display{font-size:4rem;margin:1.5rem 0}.btn-icon{font-size:1.1em;margin-right:.25rem}.lesson-complete-celebration{z-index:var(--z-toast)!important}.celebration-content{z-index:var(--z-max)!important;pointer-events:auto!important}.lesson-search-modal{position:fixed;inset:0;background:var(--overlay-medium);display:flex;justify-content:center;align-items:center;z-index:var(--z-max);animation:fadeIn var(--transition-fast)}.lesson-search-modal .modal-content{background:var(--bg-surface);padding:2rem;border-radius:0;max-width:600px;width:90%;max-height:80vh;overflow-y:auto;box-shadow:var(--shadow-elevated);animation:slideIn var(--transition-fast);border:1px solid var(--border-primary)}.search-input{width:100%;padding:.75rem 1rem;border:2px solid var(--border-subtle);border-radius:0;font-size:1rem;margin-bottom:1rem;transition:border-color var(--transition-fast);background:var(--bg-elevated);color:var(--text-primary)}.search-input:focus{outline:none;border-color:var(--accent-amber);box-shadow:0 0 0 3px #fbbf2433}.result-title{font-weight:600;color:var(--text-primary);margin-bottom:.5rem}.result-description{font-size:.9rem;color:var(--text-muted);margin-bottom:.5rem}.result-meta{display:flex;gap:1rem}.result-category,.result-difficulty{font-size:.8rem;padding:.25rem .5rem;border-radius:0;background:var(--bg-subtle);color:var(--text-secondary)}.lesson-title{font-weight:500;margin-bottom:.25rem;display:flex;align-items:center}.lesson-hierarchy-mark{color:var(--text-muted);margin-right:.5rem;font-size:.8rem}.lesson-difficulty{font-size:.75rem;color:var(--text-muted)}.progress-overview{margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border-subtle)}.progress-overview h3{font-size:1rem;margin-bottom:.75rem;color:var(--text-secondary)}.progress-text{font-size:.9rem;color:var(--text-muted)}.progress-actions{display:flex;flex-direction:column;gap:.5rem;margin-top:1rem}.reset-progress-button{width:100%;margin-top:1rem;padding:.75rem;background:var(--danger-color);color:#fff;border:none;border-radius:0;cursor:pointer;font-size:.9rem;font-weight:500;transition:all var(--transition-fast)}.reset-progress-button:hover{background:var(--btn-bg-danger-hover);transform:translateY(-2px)}.reset-progress-button:focus-visible{outline:2px solid var(--accent-amber);outline-offset:2px}.article-table{width:100%;border-collapse:collapse;margin:1rem 0}.article-table th,.article-table td{padding:.5rem;border:1px solid var(--border-subtle);text-align:left}.article-table th{background:var(--bg-elevated);font-weight:600}.article-table tr{border-bottom:1px solid var(--border-subtle)}.article-table tr:hover{background:var(--bg-subtle)}.dialogue{margin:1.5rem 0;padding:1rem;background:var(--bg-elevated);border-left:3px solid var(--accent-amber)}.speaker{padding:.5rem 1rem;margin-bottom:.5rem}.speaker:last-child{margin-bottom:0}.speaker strong{color:var(--accent-amber);font-weight:600}.speaker.linny strong{color:var(--accent-green)}.speaker.lina strong{color:var(--accent-amber)}.terminal-area{display:flex;flex-direction:column;background:var(--terminal-bg);border-radius:0;overflow:hidden;box-shadow:var(--shadow-terminal);border:1px solid var(--terminal-border);box-shadow:var(--shadow-surface)}.terminal-header{display:flex;align-items:center;justify-content:space-between;padding:.5rem 1rem;background:var(--terminal-header-bg);border-radius:0;border-bottom:1px solid var(--terminal-header-border);min-height:50px}.terminal-controls{display:flex;gap:.5rem;align-items:center}.terminal-dot,.terminal-control-btn{width:12px;height:12px;border-radius:50%}.terminal-control-btn{border:none;cursor:pointer;transition:all .15s ease}.terminal-control-btn:hover{transform:scale(1.1);box-shadow:0 2px 8px #0000004d}.terminal-control-btn.close{background:var(--accent-red)}.terminal-control-btn.minimize{background:var(--accent-amber)}.terminal-control-btn.maximize{background:var(--accent-green)}.terminal-dot{display:inline-block;box-shadow:inset 0 1px 2px #0000004d}.terminal-dot.red{background:var(--terminal-dot-red)}.terminal-dot.yellow{background:var(--terminal-dot-yellow)}.terminal-dot.green{background:var(--terminal-dot-green)}.terminal-title{color:var(--terminal-text-white);font-size:.875rem;font-weight:500;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.terminal-actions{display:flex;gap:.5rem;align-items:center}.terminal-clear{padding:.25rem .5rem;background:var(--terminal-btn-bg);color:var(--terminal-btn-text);border:1px solid var(--terminal-border);border-radius:0;cursor:pointer;font-size:.75rem;transition:var(--transition-normal)}.terminal-clear:hover{background:var(--terminal-btn-bg-hover);color:var(--terminal-btn-text-hover);transform:translateY(-1px)}.terminal-wrapper{width:100%;max-width:100%;margin:0 auto;box-shadow:var(--shadow-terminal)}.terminal{flex:1;background:var(--terminal-bg-solid);color:var(--terminal-text-white);font-family:Fira Code,Monaco,Menlo,Ubuntu Mono,Consolas,Courier New,monospace;font-size:.875rem;line-height:1.4;padding:1rem;border-radius:0;min-height:300px;overflow-y:auto;cursor:text}.terminal-output{color:var(--terminal-output);white-space:pre-wrap;word-wrap:break-word;cursor:text;margin-bottom:.5rem}.output-line{color:var(--terminal-output);margin:.25rem 0}.output-error{color:var(--terminal-error)}.output-success{color:var(--terminal-success)}.output-info{color:var(--terminal-info)}.terminal-input-line{display:flex;align-items:center;margin-top:.5rem}.terminal-prompt,.prompt{color:var(--terminal-prompt);margin-right:.5rem;font-weight:600;white-space:nowrap}.terminal-input{flex:1;background:transparent;border:none;color:var(--terminal-text-white);font-family:inherit;font-size:inherit;outline:none;caret-color:var(--terminal-prompt)}.terminal-cursor{display:inline-block;width:.5rem;height:1.2rem;background:var(--terminal-prompt);animation:cursor-blink 1s infinite;margin-left:2px}.terminal-mockup{background:var(--terminal-bg-solid);border-radius:0;padding:1rem;margin:2rem auto;font-family:Courier New,monospace;color:var(--terminal-text-green);text-align:left;max-width:500px}.terminal-mockup .prompt{color:var(--terminal-text-green)}.terminal-mockup .command{color:var(--terminal-text-white)}.terminal-line{margin:.5rem 0}.error-output{color:var(--terminal-error)}.container{max-width:1200px;margin:0 auto;background:var(--bg-surface);min-height:100vh}@media(min-width:769px)and (max-width:1199px){.container{padding:0 2rem}}@media(min-width:1200px){.container{padding:0 1rem}}@media(max-width:768px){.container{max-width:none;margin:0;display:flex;flex-direction:column;min-height:100vh;background:var(--btn-bg-primary);overflow-y:auto;overflow-x:hidden;padding:0}}.header{padding:.75rem 1rem;height:60px;position:relative;z-index:100;display:flex;align-items:center;justify-content:space-between;background:var(--btn-bg-primary);color:var(--text-primary);box-shadow:var(--shadow-sm)}@media(max-width:768px){.header{height:60px}}.header-nav{display:flex;align-items:center;justify-content:space-between;width:100%}.logo{font-size:1.1rem}.logo-image{height:40px}.main-nav{display:flex;align-items:center;gap:1rem}.main-nav .nav-link{color:var(--text-primary);text-decoration:none;font-weight:500;padding:.5rem 1rem;border-radius:0;transition:all .15s ease}.main-nav .nav-link:hover{background:var(--bg-surface)}.main-nav .nav-link.active{background:var(--bg-elevated)}.nav-dropdown{position:relative;display:inline-block}.dropdown-content{display:none;position:absolute;top:100%;left:0;background:var(--bg-elevated);min-width:250px;box-shadow:0 8px 32px #0000004d;border-radius:0;padding:.5rem 0;z-index:1000;opacity:0;transform:translateY(-.5rem);transition:all .15s ease}.dropdown-content a{color:var(--text-color);padding:.5rem 1rem;text-decoration:none;display:block;font-weight:400}.dropdown-content a:hover{background:var(--bg-light)}.dropdown-header{font-weight:600;color:var(--text-muted);padding:.5rem 1rem;font-size:.85rem;text-transform:uppercase;letter-spacing:.5px}.dropdown-section{margin-bottom:.5rem}.dropdown-section:last-child{margin-bottom:0}.hamburger-menu{display:none;flex-direction:column;justify-content:space-around;width:24px;height:24px;background:transparent;border:none;cursor:pointer;padding:0;z-index:101;position:relative}.mobile-menu,.mobile-menu-overlay{display:none}@media(max-width:768px){.main-nav{display:none}.hamburger-menu{display:flex;margin-left:auto;align-self:center}.mobile-menu,.mobile-menu-overlay{display:block}}.hamburger-line{display:block;width:24px;height:2px;background:var(--text-primary);border-radius:0;transition:all .15s ease;transform-origin:center;visibility:visible;opacity:1}.hamburger-menu.active .hamburger-line:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.hamburger-menu.active .hamburger-line:nth-child(2){opacity:0}.hamburger-menu.active .hamburger-line:nth-child(3){transform:rotate(-45deg) translate(7px,-6px)}.progress-info{display:none}.mobile-menu{position:fixed;top:0;right:-300px;width:300px;height:100%;background:var(--bg-elevated);box-shadow:0 8px 32px #0000004d;transition:all .15s ease;z-index:201;overflow-y:auto}.mobile-menu.active{right:0}.mobile-menu-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;opacity:0;visibility:hidden;transition:all .15s ease;z-index:200}.mobile-menu-overlay.active{opacity:1;visibility:visible}.mobile-menu-header{display:flex;justify-content:space-between;align-items:center;padding:1rem;background:var(--btn-bg-primary);color:var(--text-primary)}.mobile-menu-close{background:none;border:none;color:var(--text-primary);font-size:1.5rem;cursor:pointer;padding:0;width:30px;height:30px;display:flex;align-items:center;justify-content:center}.mobile-menu-content{padding:1rem 0}.mobile-nav-section{margin-bottom:2rem}.mobile-nav-section h4{font-size:.9rem;font-weight:600;color:var(--accent-amber);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem;padding:0 1rem}.mobile-nav-link{display:block;padding:.75rem 1rem;color:var(--text-color);text-decoration:none;font-size:.95rem;transition:all .15s ease;border-left:3px solid transparent}.mobile-nav-link:hover{background:var(--bg-subtle);border-left-color:var(--accent-amber);color:var(--accent-amber)}.hero-content{display:flex;flex-direction:column;align-items:center;text-align:center;gap:1.5rem}.hero-image{order:-1;width:100%;max-width:280px}.hero-main-image{width:100%;height:auto;border-radius:0;box-shadow:0 15px 30px #0003;animation:mobileHeroImageFloat 3s ease-in-out infinite}.hero-title{font-size:1.75rem;font-weight:700;margin-bottom:1rem;line-height:1.2;text-shadow:0 2px 4px rgba(0,0,0,.2)}.feature-item{display:flex;align-items:center;gap:.5rem;font-size:.9rem;justify-content:flex-start}.feature-icon{font-size:1.25rem;min-width:1.5rem}.btn-icon{font-size:1.1rem}.terminal-preview{margin-top:2rem;background:var(--bg-surface);border-radius:0;padding:1.5rem;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}.terminal-demo-image{width:100%;max-width:300px;height:auto;border-radius:0;box-shadow:0 10px 20px #0003}@keyframes mobileHeroImageFloat{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}.learning-start-section{background:var(--bg-elevated);color:var(--text-primary);padding:1.5rem 1rem 2rem;margin:1rem;border-radius:0;box-shadow:0 20px 40px #0003;max-height:90vh;overflow-y:auto;position:relative;-webkit-overflow-scrolling:touch}.learning-start-section::-webkit-scrollbar{width:4px}.learning-start-section::-webkit-scrollbar-track{background:var(--bg-surface);border-radius:0}.learning-start-section::-webkit-scrollbar-thumb{background:var(--bg-subtle);border-radius:0}.learning-start-section::-webkit-scrollbar-thumb:hover{background:var(--border-primary)}.learning-start-section:before{content:"";position:absolute;inset:0;background:#ffffff08;pointer-events:none;z-index:1}.learning-start-content{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;text-align:center;gap:1.5rem;min-height:0;height:auto}.learning-start-image{width:100%;max-width:240px;order:-1}.learning-start-main-image{width:100%;height:auto;border-radius:0;box-shadow:0 12px 25px #0003;animation:mobileLearningFloat 4s ease-in-out infinite}.learning-start-title{font-size:1.6rem;font-weight:700;margin-bottom:1rem;line-height:1.2;text-shadow:0 2px 4px rgba(0,0,0,.2)}.learning-start-description{font-size:.95rem;margin-bottom:1.5rem;line-height:1.5;opacity:.95;max-width:280px}.learning-start-tips{display:flex;flex-direction:column;align-items:center;gap:.75rem;margin-bottom:2rem;width:100%;max-width:280px}.tip-item{display:flex;align-items:center;justify-content:center;gap:.5rem;font-size:.9rem;background:var(--bg-surface);padding:.5rem .75rem;border-radius:0;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);text-align:center;width:100%;max-width:240px}.tip-icon{font-size:1.1rem;min-width:1.3rem}.start-lesson-btn{display:inline-flex;align-items:center;gap:.5rem;background:var(--bg-elevated);color:var(--text-primary);border:2px solid var(--border-primary);padding:.875rem 1.5rem;border-radius:0;font-size:1rem;font-weight:600;cursor:pointer;transition:all .15s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.start-lesson-btn:active{background:var(--bg-subtle);border-color:var(--accent-amber);transform:scale(.98)}.celebration-overlay,.levelup-overlay{position:fixed;inset:0;background:#000c;display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.celebration-modal,.levelup-modal{background:var(--bg-elevated);border-radius:0;max-width:350px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:0 25px 50px #0006;animation:mobileCelebrationSlideIn var(--animation-fast) ease-out}.celebration-content,.levelup-content{padding:2rem 1.5rem;text-align:center;display:flex;flex-direction:column;align-items:center;gap:1.5rem}.celebration-image,.levelup-image{width:100%;max-width:200px}.celebration-main-image,.levelup-main-image{width:100%;height:auto;border-radius:0;box-shadow:0 10px 20px #00000026}.celebration-title,.levelup-title{font-size:1.5rem;font-weight:700;color:var(--success-color);margin-bottom:.5rem}.celebration-message,.levelup-message{font-size:1rem;line-height:1.5;color:var(--text-color);margin-bottom:1rem}.celebration-btn,.levelup-btn{display:inline-flex;align-items:center;gap:.5rem;background:var(--success-color);color:var(--text-primary);border:none;padding:.75rem 1.25rem;border-radius:0;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .15s ease;margin:.25rem;min-width:120px}.celebration-btn:active,.levelup-btn:active{background:var(--success-hover);transform:scale(.98)}.celebration-btn.secondary{background:var(--text-muted)}.celebration-btn.secondary:active{background:var(--bg-subtle)}.levelup-details{background:var(--bg-light);border-radius:0;padding:1rem;margin:.5rem 0;width:100%;font-size:.9rem}@keyframes mobileHeroImageFloat{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}@keyframes mobileLearningFloat{0%,to{transform:translateY(0) rotate(0)}25%{transform:translateY(-5px) rotate(1deg)}75%{transform:translateY(-3px) rotate(-1deg)}}@keyframes mobileCelebrationSlideIn{0%{opacity:0;transform:translateY(30px) scale(.9)}to{opacity:1;transform:translateY(0) scale(1)}}.modal{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000}.modal-content{background:var(--bg-elevated);padding:2rem;border-radius:0;text-align:center;max-width:400px;width:90%;margin:1rem;box-shadow:0 10px 30px #0006;animation:modalSlideIn .15s ease-out}@keyframes modalSlideIn{0%{opacity:0;transform:translateY(-50px) scale(.9)}to{opacity:1;transform:translateY(0) scale(1)}}.modal-content h2{margin-bottom:1.5rem;color:var(--text-primary)}.modal-buttons{display:flex;gap:1rem;justify-content:center;margin-top:2rem}.modal-button{padding:.75rem 2rem;border:none;border-radius:0;cursor:pointer;font-weight:500;transition:all .15s ease}.modal-button.cancel{background:#6c757d;color:var(--text-primary)}.modal-button.cancel:hover{background:#5a6268;transform:translateY(-2px)}.modal-button.confirm{background:var(--danger-color);color:var(--text-primary)}.modal-button.confirm:hover{background:#c82333;transform:translateY(-2px)}.badge-celebration{background:var(--bg-elevated);border-radius:0;padding:2rem 1.5rem;text-align:center;color:var(--text-primary);box-shadow:0 25px 50px #0000004d;border:2px solid var(--accent-green);position:relative;overflow:hidden;max-width:350px;width:90%;margin:0 auto}.badge-celebration:before{content:"";position:absolute;inset:0;background:#ffffff05;pointer-events:none;z-index:1}.badge-image-container{position:relative;z-index:2;margin-bottom:1.5rem}.badge-achievement-image{max-width:200px;height:auto;border-radius:0;box-shadow:0 15px 30px #0000004d;animation:badgeImageFloat var(--animation-pulse) ease-in-out infinite;aspect-ratio:1/1;object-fit:cover}.badge-content{position:relative;z-index:2}.badge-title{font-size:1.5rem;font-weight:700;margin-bottom:1.5rem;text-shadow:0 2px 4px rgba(0,0,0,.3)}.badge-info{display:flex;align-items:center;gap:1rem;justify-content:center;margin-bottom:2rem;background:var(--bg-surface);border-radius:0;padding:1rem;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.badge-icon{font-size:3rem;min-width:3rem}.badge-details{text-align:left}.badge-name{font-size:1.1rem;font-weight:600;margin:0 0 .25rem}.badge-description{font-size:.9rem;opacity:.9;margin:0;line-height:1.4}.badge-close-btn{background:var(--bg-elevated);color:var(--text-primary);border:2px solid var(--border-primary);padding:.75rem 1.5rem;border-radius:0;font-size:1rem;font-weight:600;cursor:pointer;transition:all .15s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.badge-close-btn:active{background:var(--bg-subtle);border-color:var(--accent-amber);transform:scale(.98)}@keyframes badgeImageFloat{0%,to{transform:translateY(0) scale(1)}50%{transform:translateY(-8px) scale(1.05)}}.tabs{display:flex;height:50px;background:var(--bg-elevated);border-bottom:1px solid var(--border-subtle);overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;position:relative;z-index:50}.tabs::-webkit-scrollbar{display:none}.tab{flex:0 0 auto;padding:.75rem 1rem;background:transparent;border:none;color:var(--text-muted);font-size:.9rem;font-weight:500;cursor:pointer;white-space:nowrap;transition:all .15s ease;border-bottom:2px solid transparent;min-width:80px}.tab:hover{color:var(--accent-amber);background:var(--bg-subtle)}.tab.active{color:var(--accent-amber);border-bottom-color:var(--accent-amber);font-weight:600;background:var(--bg-subtle)}.challenge-panel{background:var(--bg-surface);border-bottom:1px solid var(--border-subtle);transition:all .15s ease;overflow:hidden;position:relative;z-index:40}.challenge-header{display:flex;justify-content:space-between;align-items:center;padding:1rem;cursor:pointer;-webkit-user-select:none;user-select:none}.challenge-title{font-size:1.1rem;font-weight:600;color:var(--text-color);margin:0}.challenge-content{padding:0 1rem 1rem;opacity:1}.challenge-description{color:var(--text-color);font-size:.95rem;line-height:1.5;margin-bottom:1rem}.challenge-meta{display:flex;gap:1rem;margin-bottom:1rem}.challenge-hint{background:#ffc1071a;border:1px solid rgba(255,193,7,.3);border-radius:0;padding:.75rem;font-size:.85rem;color:#856404}.hint-container{margin:1rem 0;padding:0}.hint-button{background:var(--bg-elevated);color:var(--text-secondary);border:1px solid var(--border-primary);padding:.75rem 1rem;border-radius:0;cursor:pointer;font-weight:500;transition:all .15s ease;display:flex;align-items:center;gap:.5rem;font-size:.9rem;width:100%;-webkit-tap-highlight-color:rgba(74,144,226,.2);touch-action:manipulation}.hint-button:hover,.hint-button:active{background:var(--bg-subtle);border-color:var(--border-subtle);transform:translateY(-1px);box-shadow:0 2px 8px #0000004d}.hint-content{margin-top:.75rem;padding:1rem;background:var(--bg-subtle);border-radius:0;font-style:italic;color:var(--accent-amber);line-height:1.6;border-left:4px solid var(--accent-amber);font-size:.85rem}.terminal-container{flex:1;display:flex;flex-direction:column;padding:1rem;background:var(--btn-bg-primary);position:relative;z-index:30;min-height:0}.terminal-area{flex:1;min-height:0}.lesson-list{display:none;flex-direction:column;gap:.5rem;padding:1rem;background:var(--bg-surface);max-height:400px;overflow-y:auto;border-bottom:1px solid var(--border-subtle)}.lesson-list.active{display:flex}@media(min-width:769px){.lesson-list{max-height:450px}}@media(max-width:768px){.lesson-list{max-height:350px}}@media(min-width:1200px){.lesson-list{max-height:500px}}.lesson-item{padding:.75rem;background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;cursor:pointer;transition:all .15s ease;-webkit-user-select:none;user-select:none}.lesson-item:hover{border-color:var(--accent-amber);box-shadow:var(--shadow-elevated);transform:translateY(-1px)}.lesson-item.active,.lesson-item.selected{border-color:var(--accent-amber);background:var(--bg-subtle)}.lesson-item.selected{box-shadow:0 0 0 2px #fbbf2433}.lesson-item.completed{background:var(--shadow-color-success-subtle);border-color:var(--shadow-color-success-light)}.lesson-item.completed.selected,.lesson-item.completed.active{background:var(--shadow-color-success-faint);border-color:var(--shadow-color-success-strong)}.lesson-title{font-weight:600;color:var(--text-color);margin-bottom:.25rem;font-size:.9rem}.lesson-difficulty{font-size:.8rem;color:var(--text-muted)}.slide-up{animation:mobileSlideUp .15s ease-out}@keyframes mobileSlideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.tab,.lesson-item,.challenge-header{-webkit-tap-highlight-color:rgba(74,144,226,.2);touch-action:manipulation}.learning-content-cards{background:var(--bg-surface);padding:2rem 1rem;margin:1rem 0;border-radius:0;box-shadow:0 4px 12px #0000004d}.learning-content-cards h2{text-align:center;color:var(--text-color);margin-bottom:1.5rem;font-size:1.5rem;font-weight:600}.guide-card{border-left-color:var(--accent-amber)}.practice-card{border-left-color:var(--success-color)}.mobile-modal-content{background:var(--bg-elevated);padding:2rem 1.5rem;border-radius:0;box-shadow:0 8px 32px #0006;width:100%;max-width:400px;text-align:center;transform:scale(.9);transition:transform .15s ease}.mobile-modal-content h2,.mobile-modal-content h3{color:var(--text-color);margin-bottom:1rem;font-size:1.5rem}.mobile-modal-content p{color:var(--text-muted);margin-bottom:2rem;line-height:1.5;font-size:.9rem}.mobile-modal-buttons{display:flex;flex-direction:column;gap:.75rem}.mobile-modal-button{background:var(--btn-bg-primary);color:var(--text-primary);border:none;padding:1rem;border-radius:0;font-weight:500;cursor:pointer;font-size:1rem;touch-action:manipulation;-webkit-tap-highlight-color:rgba(251,191,36,.2)}.mobile-modal-button:active{transform:scale(.98)}.mobile-modal-button.secondary{background:var(--bg-elevated);color:var(--accent-amber);border:2px solid var(--accent-amber)}.article-recommendation{position:fixed;bottom:70px;right:10px;left:auto;max-width:350px;min-width:280px;background:var(--bg-elevated);border-radius:0;box-shadow:var(--shadow-surface);border-top:4px solid var(--accent-amber);transform:translateY(100px);transition:transform .15s ease;z-index:var(--z-navigation)}.article-recommendation.show{transform:translateY(0)}@supports (padding-bottom: env(safe-area-inset-bottom)){.article-recommendation{bottom:calc(70px + env(safe-area-inset-bottom))}}.hero-content{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center;max-width:1200px;margin:0 auto}.hero-text{animation:fadeInUp .8s ease-out}.hero-title{font-size:2.5rem;font-weight:700;margin-bottom:1.5rem;line-height:1.2;text-shadow:0 2px 4px rgba(0,0,0,.2)}.feature-item{display:flex;align-items:center;gap:.75rem;font-size:1rem}.feature-icon{font-size:1.5rem;display:inline-block;min-width:2rem}.btn-icon{font-size:1.2rem}.hero-image{display:flex;justify-content:center;align-items:center;animation:fadeInRight .8s ease-out}.hero-main-image{max-width:100%;height:auto;border-radius:0;box-shadow:0 20px 40px #0003;transition:transform .15s ease}.hero-main-image:hover{transform:scale(1.05)}.feature-demo{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}.terminal-demo-image{max-width:100%;height:auto;border-radius:0;box-shadow:0 15px 30px #0003;transition:transform .15s ease}.terminal-demo-image:hover{transform:scale(1.03)}@media(max-width:767px){.hero-content{grid-template-columns:1fr;gap:2rem;text-align:center}.hero-title{font-size:1.8rem}.hero-image{order:-1}.feature-demo{grid-template-columns:1fr}}.recent-updates{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:var(--spacing-lg);margin-bottom:var(--spacing-xl)}.progress-running-mascot{text-align:center;padding:1.5rem 1rem;margin:1rem 0;background:var(--btn-bg-primary);border-radius:0;color:#fff;box-shadow:var(--shadow-surface)}.progress-running-image{max-width:120px;height:auto;border-radius:0;box-shadow:var(--shadow-surface);margin-bottom:.75rem;animation:runningMotion 2s ease-in-out infinite;transition:transform .15s ease}.progress-running-image:hover{transform:scale(1.05)}.progress-info{display:flex;gap:2rem;align-items:center}.level-indicator{background:var(--bg-subtle);padding:.5rem 1rem;border-radius:0}.badges-container{display:flex;align-items:center;gap:.5rem}.badge-count{font-size:1.2rem}.progress-ring{transform:rotate(-90deg)}.progress-ring-background{fill:none;stroke:var(--bg-subtle);stroke-width:2}.progress-ring-progress{fill:none;stroke:var(--accent-green);stroke-width:2;stroke-linecap:round;stroke-dasharray:50.27;stroke-dashoffset:50.27;transition:stroke-dashoffset .3s ease}.progress-percentage{font-size:.75rem;font-weight:600;color:var(--accent-green);min-width:32px;text-align:center}.linux-intro-section{padding:3rem 2rem;background:var(--bg-elevated)}.linux-intro-section h2{text-align:center;font-size:1.8rem;margin-bottom:2rem;color:var(--text-primary)}.intro-content{max-width:900px;margin:0 auto}.intro-text{line-height:1.8}.intro-text p{margin-bottom:1.5rem;font-size:1.05rem;color:var(--text-secondary)}.intro-text h3{font-size:1.2rem;margin:1.5rem 0 1rem;color:var(--secondary-color)}.benefit-list,.target-list{list-style:none;padding:0;margin:0 0 1.5rem}.benefit-list li,.target-list li{padding:.8rem 0 .8rem 2rem;position:relative;border-bottom:1px solid var(--border-subtle)}.benefit-list li:before{content:"✓";position:absolute;left:0;color:var(--accent-green);font-weight:700}.target-list li:before{content:"→";position:absolute;left:0;color:var(--secondary-color)}.learning-flow-section{padding:3rem 2rem;background:var(--bg-surface)}.learning-flow-section h2{text-align:center;font-size:1.8rem;margin-bottom:2rem;color:var(--text-primary)}.flow-steps{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:1.5rem}.flow-step{display:flex;align-items:flex-start;gap:1.5rem;padding:1.5rem;background:var(--bg-subtle);border-radius:0;border-left:4px solid var(--secondary-color)}.step-number{flex-shrink:0;width:50px;height:50px;background:var(--btn-bg-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700}.step-content h3{font-size:1.2rem;margin-bottom:.5rem;color:var(--text-primary)}.step-content p{color:var(--text-secondary);line-height:1.6;margin:0}.step-content code{background:var(--bg-surface);padding:2px 6px;border-radius:0;font-family:monospace;font-size:.9em}.faq-excerpt-section{padding:3rem 2rem;background:var(--bg-elevated)}.faq-excerpt-section h2{text-align:center;font-size:1.8rem;margin-bottom:2rem;color:var(--text-primary)}.faq-excerpt-list{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:1rem}.faq-excerpt-item{background:var(--bg-subtle);padding:1.5rem;border-radius:0;box-shadow:var(--shadow-surface);border-left:3px solid var(--secondary-color)}.faq-excerpt-question{font-size:1.1rem;color:var(--text-primary);margin-bottom:.8rem}.faq-excerpt-answer{color:var(--text-secondary);line-height:1.7;margin:0}.faq-excerpt-answer code{background:var(--bg-surface);padding:2px 6px;border-radius:0;font-family:monospace;font-size:.9em}.faq-more-link{display:inline-block;color:var(--secondary-color);text-decoration:none;font-weight:600;padding:.5rem 1rem;border:2px solid var(--secondary-color);border-radius:0;transition:all .15s ease}.faq-more-link:hover{background:var(--secondary-color);color:#fff}.faq-more-link:focus-visible{outline:2px solid var(--accent-amber);outline-offset:2px}.troubleshoot-banner{margin:2rem auto 0;max-width:600px}.troubleshoot-link{display:flex;align-items:center;gap:1rem;padding:1rem 1.5rem;background:var(--bg-subtle);border:2px solid var(--border-primary);border-radius:0;text-decoration:none;transition:all .15s ease}.troubleshoot-link:hover{transform:translateY(-2px);box-shadow:var(--shadow-surface);background:var(--bg-surface)}.troubleshoot-link:focus-visible{outline:2px solid var(--accent-amber);outline-offset:2px}.banner-icon{font-size:1.8rem;flex-shrink:0}.banner-text{flex:1}.banner-text strong{display:block;color:var(--accent-amber);font-size:1rem;margin-bottom:.25rem}.banner-text small{color:var(--text-secondary);font-size:.85rem}.banner-arrow{font-size:1.5rem;color:var(--accent-amber);flex-shrink:0}@media(max-width:767px){.linux-intro-section,.learning-flow-section,.faq-excerpt-section{padding:2rem 1rem}.linux-intro-section h2,.learning-flow-section h2,.faq-excerpt-section h2{font-size:1.5rem}.flow-step{flex-direction:column;align-items:center;text-align:center;gap:1rem}.step-number{width:40px;height:40px;font-size:1.2rem}.benefit-list li,.target-list li{padding-left:1.5rem}.troubleshoot-banner{margin:1.5rem 1rem 0}.troubleshoot-link{padding:.875rem 1rem;gap:.75rem}.banner-icon{font-size:1.5rem}.banner-text strong{font-size:.9rem}.banner-text small{font-size:.8rem}.banner-arrow{font-size:1.2rem}}.lesson-info-panel{background:var(--bg-elevated);border:2px solid var(--border-primary);border-radius:0;padding:1.25rem;margin-bottom:1.5rem;box-shadow:var(--shadow-surface);position:relative;min-height:120px;transition:all .15s ease;overflow:hidden}.lesson-info-panel:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:2px;background:var(--accent-green);animation:shimmer 2s infinite}.lesson-info-panel:hover{transform:translateY(-2px);box-shadow:var(--shadow-elevated);border-color:var(--accent-amber)}.lesson-info-panel h3{color:var(--accent-amber);font-size:1.1rem;font-weight:600;margin-bottom:.75rem;line-height:1.4}.lesson-info-panel p{color:var(--text-secondary);font-size:.9rem;line-height:1.5;margin-bottom:0}.lesson-info-panel .hint-content{margin-top:1rem;padding:.75rem;background:#ffbf0040;border:1px solid var(--accent-amber);border-radius:0;font-size:.85rem;color:var(--accent-amber)}.lesson-filter-grid{display:grid;grid-template-columns:1fr 1fr;gap:.5rem;margin-bottom:1rem}.lesson-filter-grid .filter-btn{padding:.6rem .75rem;font-size:.85rem;font-weight:500;white-space:nowrap;text-align:center}.lesson-list-scrollable{flex:1;overflow-y:auto;max-height:calc(100vh - 400px)}.lesson-list-section{display:flex;flex-direction:column;flex:1;min-height:0}.lesson-item,.lesson-card{padding:1rem;background:var(--bg-elevated);border-radius:0;cursor:pointer;transition:all .15s cubic-bezier(.4,0,.2,1);border:1px solid var(--border-subtle);position:relative;margin:.5rem 1rem;font-size:.9rem;border-left:4px solid var(--border-subtle);display:flex;flex-direction:column;align-items:flex-start;box-shadow:var(--shadow-elevated);color:var(--text-primary)}.lesson-item:hover,.lesson-card:hover{transform:translate(4px) translateY(-2px);border-color:var(--border-primary);border-left-color:var(--accent-green);background:var(--bg-subtle);box-shadow:var(--shadow-surface)}.lesson-item.active,.lesson-card.active{background:var(--btn-bg-primary);color:#fff;border-color:var(--secondary-color);border-left-color:var(--accent-amber);transform:translate(8px);box-shadow:var(--shadow-surface)}.lesson-item:focus-visible,.lesson-card:focus-visible{outline:2px solid var(--accent-amber);outline-offset:2px}.lesson-item.completed,.lesson-card.completed{background:var(--bg-elevated);border-left-color:var(--accent-green)}.lesson-item.completed:after,.lesson-card.completed:after{content:"✅";position:absolute;right:10px;top:10px;font-size:1.125rem;z-index:var(--z-raised)}.lesson-item.active:not(.completed):after,.lesson-card.active:not(.completed):after{content:"";display:none}.lesson-item.active.completed:after,.lesson-card.active.completed:after{content:"✅";display:block}.lesson-content{width:100%;display:flex;flex-direction:column;gap:.5rem}.lesson-title{font-weight:600;color:var(--text-primary);line-height:1.3;font-size:1rem;margin-bottom:.25rem}.lesson-description{font-size:.85rem;color:var(--text-muted);line-height:1.4;margin:.25rem 0}.lesson-item.active .lesson-description,.lesson-card.active .lesson-description{color:#ffffffd9}.lesson-item.active .lesson-title,.lesson-card.active .lesson-title{color:#fff}.lesson-meta{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.5rem;font-size:.75rem;color:var(--text-muted);width:100%;margin-top:.25rem}.lesson-item.active .lesson-meta,.lesson-card.active .lesson-meta{color:#fffc}.lesson-status-icon{font-size:1.25rem;transition:transform .15s ease;flex-shrink:0}.lesson-item:hover .lesson-status-icon,.lesson-card:hover .lesson-status-icon{transform:scale(1.1)}.lesson-difficulty{background:var(--shadow-color-secondary-subtle);color:var(--text-muted);padding:.125rem .5rem;border-radius:0;font-size:.7rem;font-weight:500;white-space:nowrap;border-style:solid;border-color:transparent}.lesson-difficulty.beginner{background:#22c55e1a;color:var(--accent-green);border-width:1px;border-color:var(--accent-green)}.lesson-difficulty.intermediate{background:#fbbf241a;color:var(--accent-amber);border-width:2px;border-color:var(--accent-amber)}.lesson-difficulty.application,.lesson-difficulty.advanced{background:#ef44441a;color:var(--accent-red);border-width:3px;border-color:var(--accent-red)}.lesson-item.active .lesson-difficulty,.lesson-card.active .lesson-difficulty{background:var(--bg-subtle);color:var(--text-primary)}@media(max-width:768px){.lesson-info-panel{min-height:80px;padding:1rem}.lesson-filter-grid{grid-template-columns:1fr 1fr;gap:.4rem}.lesson-filter-grid .filter-btn{padding:.5rem .6rem;font-size:.8rem}}.challenge-area{padding:1.5rem;background:var(--light-color);display:flex;gap:1.5rem;min-height:200px}.challenge-card{flex:1;background:var(--bg-elevated);border-radius:0;padding:2rem;box-shadow:var(--shadow-surface);border:2px solid var(--border-subtle);transition:all .15s ease;position:relative;overflow:hidden}.challenge-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--accent-green);opacity:0;transition:opacity .15s ease}.challenge-card.active:before{opacity:1}.challenge-card.active{border-color:var(--accent-amber);box-shadow:var(--shadow-surface)}.challenge-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:1.5rem}.challenge-title-group h2{color:var(--text-color);margin:0 0 .75rem;font-size:1.5rem;font-weight:700}.challenge-meta{display:flex;gap:1rem;align-items:center}.difficulty-badge{display:inline-block;padding:.3rem .8rem;border-radius:0;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px;background:var(--bg-elevated);color:var(--text-primary);border-style:var(--border-style-default);border-color:var(--text-secondary)}.difficulty-badge.beginner{border-width:1px}.difficulty-badge.intermediate{border-width:2px}.difficulty-badge.application,.difficulty-badge.advanced{border-width:3px}.challenge-status-wrapper{display:flex;align-items:center}.challenge-status{padding:.6rem 1.2rem;border-radius:0;font-weight:600;font-size:.9rem;display:flex;align-items:center;gap:.5rem;transition:all .15s ease}.challenge-status.completed{background:transparent;color:var(--accent-green);border:2px solid var(--accent-green)}.challenge-status.completed:before{content:"✓";font-weight:700}.challenge-status.pending{background:transparent;color:var(--text-secondary);border:2px solid var(--border-primary)}.challenge-status.pending:before{content:"📋"}.challenge-content{display:flex;flex-direction:column;gap:1.5rem}.challenge-description{font-size:1.1rem;line-height:1.7;color:var(--text-secondary);background:var(--bg-subtle);padding:1.5rem;border-radius:0;border-left:4px solid var(--accent-amber)}.command-reference{background:#4a90e20d;padding:1.5rem;border-radius:0;border:1px solid rgba(74,144,226,.1)}.command-reference h4{margin-bottom:1rem;color:var(--accent-amber);font-size:1rem}.command-list{display:flex;flex-wrap:wrap;gap:.75rem}.command-item{background:var(--bg-elevated);padding:.5rem 1rem;border-radius:0;font-family:Courier New,monospace;font-size:.9rem;color:var(--text-primary);border:1px solid var(--border-subtle);transition:all .15s ease;cursor:pointer}.command-item:hover{background:var(--btn-bg-primary);color:var(--text-primary);transform:translateY(-1px);box-shadow:var(--shadow-elevated)}.command-item:focus-visible{outline:2px solid var(--accent-amber);outline-offset:2px}.hint-container{background:var(--bg-elevated);padding:1.5rem;border-radius:0;border:1px solid var(--border-subtle);box-shadow:0 2px 10px #0003}.hint-button{background:var(--bg-subtle);color:var(--text-primary);border:1px solid var(--border-primary);padding:.8rem 1.5rem;border-radius:0;cursor:pointer;font-weight:500;transition:all .15s ease;display:flex;align-items:center;gap:.5rem;font-size:1rem}.hint-button:hover{background:var(--accent-amber);color:var(--bg-void);border-color:var(--accent-amber);transform:translateY(-1px);box-shadow:0 2px 8px #fbbf244d}.hint-button:focus-visible{outline:2px solid var(--accent-amber);outline-offset:2px}.hint-content{margin-top:1.5rem;padding:1.5rem;background:var(--bg-subtle);border-radius:0;font-style:italic;color:var(--accent-amber);line-height:1.6;border-left:4px solid var(--accent-amber)}.progress-stats{display:flex;flex-direction:column;gap:1rem}.learning-start-section{display:flex;align-items:center;justify-content:center;min-height:300px;padding:2rem}.learning-start-content{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center;max-width:800px;margin:0 auto}.learning-start-image{display:flex;justify-content:center;align-items:center}.learning-start-main-image{max-width:100%;height:auto;border-radius:0;box-shadow:0 15px 30px #0000001a;animation:gentleBounce 2s ease-in-out infinite}.learning-start-text h3{font-size:1.5rem;margin-bottom:1rem;color:var(--accent-amber);font-weight:700}.learning-start-text p{font-size:1rem;line-height:1.6;margin-bottom:1.5rem;color:var(--text-color)}.tip-item{display:flex;align-items:center;gap:.5rem;font-size:.9rem;color:var(--text-muted)}.tip-icon{font-size:1.2rem;min-width:1.5rem}@media(max-width:768px){.learning-start-content{grid-template-columns:1fr;gap:2rem;text-align:center}.learning-start-image{order:-1}}.dashboard-container{min-height:100vh;background:var(--bg-void);position:relative}.dashboard-main{max-width:1200px;margin:0 auto;padding:2rem 1rem;margin-top:2rem}.breadcrumb{max-width:1200px;margin:0 auto;padding:1rem 1rem 0;margin-top:1rem;font-size:.9rem;color:var(--text-muted)}@media(min-width:768px){.dashboard-container .main-nav{display:flex}.dashboard-container .hamburger-menu,.dashboard-container .mobile-menu,.dashboard-container .mobile-menu-overlay{display:none}}.learning-summary{background:var(--bg-surface);border-radius:0;padding:2rem;box-shadow:0 4px 6px #0000004d;margin-bottom:2rem;border:1px solid var(--border-subtle)}.summary-header{text-align:center;margin-bottom:2rem}.summary-header h1{margin:0 0 .5rem;color:var(--text-primary);font-size:2.5rem;font-weight:700}.summary-subtitle{color:var(--text-secondary);font-size:1.1rem;margin:0}.summary-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-bottom:2rem}.summary-card{background:var(--bg-elevated);border-radius:0;border-left:4px solid var(--border-primary);padding:1.5rem;color:var(--text-primary);display:flex;align-items:center;gap:1rem;transition:transform .15s ease,box-shadow .15s ease}.summary-card:hover{transform:translateY(-2px);box-shadow:0 8px 15px #0000004d}.summary-icon{font-size:2.5rem;opacity:.9}.summary-value{font-size:1.8rem;font-weight:700;margin-bottom:.25rem}.summary-label{font-size:.9rem;color:var(--text-secondary)}.overall-progress-section{text-align:center}.progress-bar-container{max-width:600px;margin:0 auto}.progress-bar{width:100%;height:12px;background:var(--bg-subtle);border-radius:0;overflow:hidden;margin-bottom:1rem}.progress-bar-fill{height:100%;background:var(--btn-bg-primary-alt);border-radius:0;width:0%;transition:width var(--animation-slow) ease}.progress-text{font-size:1.1rem;font-weight:600;color:var(--text-primary)}.badge-section{background:var(--bg-surface);border-radius:0;padding:2rem;box-shadow:0 4px 6px #0000004d;margin-bottom:2rem;border:1px solid var(--border-subtle)}.badge-section h2{margin:0 0 2rem;color:var(--text-primary);font-size:1.8rem;text-align:center}.badge-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1.5rem;justify-items:center;max-width:100%}.badge-item{display:flex;flex-direction:column;align-items:center;padding:1rem;border-radius:0;background:var(--bg-elevated);transition:all .15s ease;cursor:pointer;text-align:center;position:relative;width:100%;aspect-ratio:1/1.2;justify-content:space-between;box-sizing:border-box;border:1px solid var(--border-subtle)}.badge-item:hover{transform:translateY(-3px);box-shadow:0 8px 15px #0000004d;background:var(--bg-subtle)}.badge-icon{font-size:3rem;margin-bottom:.5rem;position:relative}.badge-icon-hexagon{width:80px;height:80px;background:var(--bg-subtle);margin:0 auto .5rem;position:relative;display:flex;align-items:center;justify-content:center;clip-path:polygon(50% 0%,100% 25%,100% 75%,50% 100%,0% 75%,0% 25%);font-size:2rem;transition:all .15s ease}.badge-item.earned .badge-icon-hexagon{background:var(--accent-green);color:var(--bg-void);text-shadow:none}.badge-item.locked .badge-icon-hexagon{background:var(--bg-subtle);color:var(--text-dim);filter:grayscale(100%);opacity:.7}.badge-name{font-size:.9rem;font-weight:600;color:var(--text-primary);margin-bottom:.25rem;line-height:1.2}.badge-item.locked .badge-name{color:var(--text-muted)}.badge-status{font-size:.8rem;color:var(--text-secondary)}.badge-item.earned .badge-status{color:var(--success-color);font-weight:600}.badge-item.locked .badge-status{color:var(--text-muted)}.badge-lock-icon{position:absolute;bottom:-5px;right:-5px;background:var(--danger-color);color:#fff;border-radius:50%;width:20px;height:20px;display:flex;align-items:center;justify-content:center;font-size:.8rem}.badge-item.earned .badge-lock-icon{background:var(--success-color)}.badge-share-buttons{display:flex;gap:.5rem;margin-top:.5rem;justify-content:center}.badge-share-btn{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:50%;width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s ease;font-size:.9rem;padding:0;color:var(--text-secondary)}.badge-share-btn:hover{transform:scale(1.1);box-shadow:0 2px 8px #00000026}.badge-share-web:hover{background:#007acc;color:#fff;border-color:#007acc}.badge-share-twitter:hover{background:#1da1f2;color:#fff;border-color:#1da1f2}.badge-share-facebook:hover{background:#1877f2;color:#fff;border-color:#1877f2}.badge-item.locked .badge-share-buttons{display:none}.badge-modal{position:fixed;top:0;left:0;width:100%;height:100%;z-index:1000;display:none;align-items:center;justify-content:center}.badge-modal.active{display:flex}.badge-modal-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#00000080;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.badge-modal-content{position:relative;background:var(--bg-surface);border-radius:0;max-width:400px;width:90%;max-height:80vh;overflow-y:auto;animation:modalSlideIn .15s ease;box-shadow:0 10px 30px #00000080;border:1px solid var(--border-primary)}@keyframes modalSlideIn{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.badge-modal-close{position:absolute;top:1rem;right:1rem;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text-secondary);transition:color .15s ease}.badge-modal-close:hover{color:var(--text-primary)}.badge-modal-header{text-align:center;padding:2rem 2rem 1rem}.badge-modal-icon{font-size:4rem;margin-bottom:1rem}.badge-modal-title{margin:0;color:var(--text-primary);font-size:1.5rem}.badge-modal-body{padding:0 2rem 2rem}.badge-modal-description{color:var(--text-secondary);line-height:1.6;margin-bottom:1.5rem}.badge-modal-condition{background:var(--bg-subtle);padding:1rem;border-radius:0;margin-bottom:1rem;border-left:4px solid var(--accent-amber);color:var(--text-secondary)}.badge-modal-status{padding:.75rem;border-radius:0;font-weight:600;text-align:center}.badge-modal-status.earned{background:#22c55e26;color:var(--accent-green);border:1px solid var(--accent-green)}.badge-modal-status.locked{background:#ef444426;color:var(--accent-red);border:1px solid var(--accent-red)}.share-section{background:var(--bg-surface);border-radius:0;padding:2rem;box-shadow:0 4px 6px #0000004d;margin-bottom:2rem;text-align:center;border:1px solid var(--border-subtle)}.share-section h2{margin:0 0 1rem;color:var(--text-primary);font-size:1.8rem}.share-buttons{display:flex;gap:1rem;justify-content:center;margin-bottom:1rem;flex-wrap:wrap}.share-button{display:flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;border:none;border-radius:0;font-size:1rem;cursor:pointer;transition:all .15s ease;text-decoration:none;color:#fff;min-width:130px;justify-content:center}.share-web{background:var(--secondary-color)}.share-twitter{background:#1da1f2}.share-facebook{background:#4267b2}.share-button:hover{transform:translateY(-2px);box-shadow:0 4px 8px #0003}.share-description{color:var(--text-secondary);margin:0;font-size:.9rem}.continue-learning{background:var(--bg-surface);border-radius:0;padding:2rem;box-shadow:0 4px 6px #0000004d;text-align:center;border:1px solid var(--border-subtle)}.continue-learning h2{margin:0 0 1.5rem;color:var(--text-primary);font-size:1.8rem}.continue-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.continue-button{display:inline-flex;align-items:center;gap:.5rem;padding:1rem 2rem;border-radius:0;text-decoration:none;font-size:1.1rem;font-weight:600;transition:all .15s ease;min-width:200px;justify-content:center}.continue-button.primary{background:var(--btn-bg-primary);color:#fff}.continue-button.secondary{background:var(--bg-elevated);color:var(--text-primary);border:2px solid var(--border-primary)}.continue-button:hover{transform:translateY(-2px);box-shadow:0 6px 12px #0000004d}.continue-button.secondary:hover{background:var(--bg-subtle);border-color:var(--text-muted)}@media(max-width:768px){.dashboard-main{padding:1rem .5rem}.learning-summary,.badge-section,.share-section,.continue-learning{padding:1.5rem;margin-bottom:1.5rem}.summary-header h1{font-size:2rem}.summary-cards{grid-template-columns:1fr}.badge-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1rem}.badge-item{min-height:140px}.badge-share-btn{width:28px;height:28px;font-size:.8rem}.badge-icon-hexagon{width:60px;height:60px;font-size:1.5rem}.share-buttons{flex-direction:column;align-items:center}.share-button{width:200px}.continue-actions{flex-direction:column;align-items:center}.continue-button{width:250px}}@media(max-width:480px){.breadcrumb{padding:.5rem}.dashboard-main{padding:1rem .25rem}.summary-header h1{font-size:1.8rem}.badge-grid{grid-template-columns:repeat(2,1fr);gap:.8rem}.badge-item{min-height:120px;padding:.8rem}.badge-share-btn{width:24px;height:24px;font-size:.7rem}.badge-share-buttons{gap:.3rem}.badge-modal-content{width:95%}}.data-management{background:var(--bg-surface);border-radius:0;padding:2rem;margin-top:2rem;box-shadow:0 4px 15px #0000004d;border:1px solid var(--border-subtle)}.data-management h2{color:var(--text-primary);margin-bottom:1.5rem;font-size:1.5rem;display:flex;align-items:center;gap:.5rem}.data-management-content{display:flex;flex-direction:column;gap:1.5rem}.data-management-description{color:var(--text-secondary);line-height:1.6}.data-management-description p{margin-bottom:.8rem}.data-management-description strong{color:#e74c3c;font-weight:600}.data-management-actions{display:flex;justify-content:center}.reset-progress-button{background:var(--accent-red);color:#fff;border:none;padding:1rem 2rem;border-radius:0;font-size:1rem;font-weight:600;cursor:pointer;transition:all .15s ease;box-shadow:0 4px 15px #ff52524d;display:flex;align-items:center;gap:.5rem}.reset-progress-button:hover{filter:brightness(1.1);transform:translateY(-2px);box-shadow:0 6px 20px #ff525266}.reset-progress-button:active{transform:translateY(0);box-shadow:0 2px 10px #e74c3c4d}.quiz-progress{background:var(--bg-surface);border-radius:0;padding:2rem;margin-bottom:2rem;box-shadow:0 4px 20px #0000004d;border:1px solid var(--border-subtle)}.quiz-progress h2{margin:0 0 1.5rem;color:var(--text-primary);font-size:1.8rem;text-align:center}.quiz-progress-content{display:flex;flex-direction:column;gap:2rem}.quiz-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:1.5rem}.quiz-stat-card{background:var(--btn-bg-primary);border-radius:0;padding:1.5rem;color:#fff;display:flex;align-items:center;gap:1rem;box-shadow:0 4px 15px #0000004d;transition:transform .15s ease}.quiz-stat-card:hover{transform:translateY(-3px)}.quiz-stat-card .stat-icon{font-size:2rem;opacity:.9}.quiz-stat-card .stat-content{flex:1}.quiz-stat-card .stat-value{font-size:1.8rem;font-weight:800;margin-bottom:.3rem;text-shadow:0 1px 3px rgba(0,0,0,.3);color:#fff}.quiz-stat-card .stat-label{font-size:.9rem;opacity:.95;font-weight:500;text-shadow:0 1px 2px rgba(0,0,0,.2);color:#fff}.level-stats-section{background:var(--bg-elevated);border-radius:0;padding:1.5rem}.level-stats-section h3{margin:0 0 1rem;color:var(--text-primary);font-size:1.4rem}.level-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1rem}.level-stat-card{background:var(--bg-subtle);border-radius:0;padding:1.2rem;border-left:4px solid var(--border-primary);transition:all .15s ease}.level-stat-card.attempted{border-left:4px solid var(--accent-green);background:var(--bg-elevated)}.level-stat-card.not-attempted{border-left:4px solid var(--border-subtle);background:var(--bg-surface)}.level-stat-card:hover{transform:translateY(-2px);box-shadow:0 4px 15px #0000001a}.level-header{margin-bottom:1rem}.level-name{font-size:1.1rem;font-weight:600;margin-bottom:.3rem}.level-description{font-size:.85rem;color:var(--text-secondary)}.level-stats{display:flex;flex-direction:column;gap:.5rem}.level-score,.level-average,.level-attempts{display:flex;justify-content:space-between;align-items:center}.level-not-attempted{text-align:center;padding:1rem 0}.challenge-button{background:var(--secondary-color);color:#fff;text-decoration:none;padding:.6rem 1.2rem;border-radius:0;font-size:.9rem;font-weight:500;transition:all .15s ease;display:inline-block}.challenge-button:hover{filter:brightness(1.1);transform:translateY(-1px)}.result-rank{background:var(--btn-bg-primary);color:#fff;width:2rem;height:2rem;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.9rem;flex-shrink:0}.result-info{flex:1}.result-level{font-weight:600;font-size:1rem;color:var(--text-primary);margin-bottom:.2rem}.result-score{font-size:1.1rem;font-weight:700;color:var(--success-color);margin-bottom:.2rem}.result-details{font-size:.85rem;color:var(--text-secondary)}.result-date{font-size:.8rem;color:var(--text-muted);text-align:right;flex-shrink:0}@media(max-width:768px){.data-management{padding:1.5rem;margin-top:1.5rem}.data-management h2{font-size:1.3rem}.reset-progress-button{width:100%;justify-content:center;padding:1.2rem 1.5rem}.quiz-progress{padding:1.5rem;margin-bottom:1.5rem}.quiz-stats-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:.8rem}.quiz-stat-card{padding:1rem;flex-direction:column;text-align:center;gap:.5rem}.quiz-stat-card .stat-icon{font-size:1.5rem}.quiz-stat-card .stat-value{font-size:1.5rem;font-weight:800;text-shadow:0 1px 3px rgba(0,0,0,.3);color:#fff}.level-stats-grid{grid-template-columns:1fr;gap:.8rem}.level-stat-card{padding:1rem}.result-rank{align-self:flex-start}.result-date{text-align:left;align-self:flex-end}}.reading-progress{background:var(--bg-surface);border-radius:0;padding:2rem;margin-bottom:2rem;box-shadow:0 4px 20px #0000004d;border:1px solid var(--border-subtle)}.reading-progress h2{margin:0 0 1.5rem;color:var(--text-primary);font-size:1.8rem;text-align:center}.reading-progress-content{display:flex;flex-direction:column;gap:2rem}.reading-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:1.5rem}.reading-stat-card{background:var(--accent-green);border-radius:0;padding:1.5rem;color:var(--bg-void);display:flex;align-items:center;gap:1rem;box-shadow:0 4px 15px var(--shadow-green-light);transition:transform .15s ease}.reading-stat-card:hover{transform:translateY(-3px)}.reading-stat-card .stat-icon{font-size:2rem;opacity:.9}.reading-stat-card .stat-content{flex:1}.reading-stat-card .stat-value{font-size:1.8rem;font-weight:800;margin-bottom:.3rem;text-shadow:0 1px 3px rgba(0,0,0,.3);color:#fff}.reading-stat-card .stat-label{font-size:.9rem;opacity:.95;font-weight:500;text-shadow:0 1px 2px rgba(0,0,0,.2);color:#fff}.reading-category-section{background:var(--bg-elevated);border-radius:0;padding:1.5rem}.reading-category-section h3{margin:0 0 1rem;color:var(--text-primary);font-size:1.4rem}.reading-category-stats{display:flex;flex-direction:column;gap:1rem}.category-stat-item{background:var(--bg-subtle);border-radius:0;padding:1rem;display:flex;align-items:center;justify-content:space-between;gap:1rem;box-shadow:0 2px 8px #0003;transition:transform .15s ease}.category-stat-item:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000004d}.category-name{font-weight:600;font-size:1rem;color:var(--text-primary);flex-shrink:0}.category-progress{display:flex;align-items:center;gap:.8rem;flex:1}.category-bar{background:var(--bg-surface);border-radius:0;height:8px;flex:1;overflow:hidden}.category-fill{height:100%;border-radius:0;transition:width var(--animation-fast) ease}.category-fill.guides,.category-fill.tutorials{background:var(--accent-green)}.category-fill.faq{background:var(--accent-red)}.category-count{font-weight:600;font-size:.9rem;color:var(--text-secondary);flex-shrink:0}.reading-recent-section{background:var(--bg-elevated);border-radius:0;padding:1.5rem}.reading-recent-section h3{margin:0 0 1rem;color:var(--text-primary);font-size:1.4rem}.reading-actions{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap}.action-btn{display:inline-flex;align-items:center;gap:.5rem;padding:.8rem 1.5rem;border-radius:0;text-decoration:none;font-weight:500;transition:all .15s ease;border:2px solid transparent}.action-btn.guides{background:var(--accent-green);color:var(--bg-void)}.action-btn.guides:hover{filter:brightness(.9);transform:translateY(-2px);box-shadow:0 4px 15px var(--shadow-green-light)}.action-btn.tutorials{background:var(--accent-green);color:var(--bg-void)}.action-btn.tutorials:hover{filter:brightness(.9);transform:translateY(-2px);box-shadow:0 4px 15px var(--shadow-green-light)}.action-btn.faq{background:var(--accent-red);color:var(--bg-void)}.action-btn.faq:hover{filter:brightness(.9);transform:translateY(-2px);box-shadow:0 4px 15px #ff52524d}@media(max-width:768px){.reading-progress{padding:1.5rem;margin-bottom:1.5rem}.reading-stats-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:.8rem}.reading-stat-card{padding:1rem;flex-direction:column;text-align:center;gap:.5rem}.reading-stat-card .stat-icon,.reading-stat-card .stat-value{font-size:1.5rem}.category-stat-item{flex-direction:column;align-items:flex-start;gap:.8rem;padding:1rem}.category-progress{width:100%}.reading-actions{gap:.5rem}.action-btn{font-size:.9rem;padding:.7rem 1.2rem}}.quiz-page-container{min-height:100vh;background:var(--bg-void)}.quiz-main{max-width:1200px;margin:0 auto;padding:2rem 1rem}.quiz-wrapper{display:flex;gap:2rem}.quiz-container{flex:1;background:var(--bg-surface);border-radius:0;padding:2rem;box-shadow:0 10px 30px #0006;min-height:600px;border:1px solid var(--border-subtle)}.quiz-sidebar{width:300px;display:flex;flex-direction:column;gap:1.5rem}.sidebar-section{background:var(--bg-elevated);border-radius:0;padding:1.5rem;box-shadow:0 4px 10px #0000004d;border:1px solid var(--border-subtle)}.sidebar-section h3{margin:0 0 1rem;color:var(--text-primary);font-size:1.1rem}.sidebar-section p{color:var(--text-secondary);line-height:1.6;font-size:.95rem}.sidebar-section ul{margin:1rem 0 0;padding-left:1.5rem;color:var(--text-secondary)}.level-list{margin:0}.level-list dt{font-weight:600;margin:.75rem 0 .25rem;color:var(--text-primary)}.level-list dd{margin:0 0 0 1rem;color:var(--text-secondary);font-size:.9rem}.level-selection{text-align:center}.level-selection h2{color:var(--text-primary);margin-bottom:.5rem;font-size:2rem}.level-selection .description{color:var(--text-secondary);margin-bottom:2rem;font-size:1.1rem}.level-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-bottom:3rem}.level-card{position:relative;height:100%}.level-button{width:100%;min-height:200px;padding:1.5rem 1rem;background:var(--bg-elevated);border:3px solid;border-radius:0;cursor:pointer;transition:all .15s ease;position:relative;overflow:hidden;display:flex;flex-direction:column;justify-content:space-between;align-items:center;text-align:center;height:100%}.level-button:hover{transform:translateY(-5px);box-shadow:0 10px 25px #0006;background:var(--bg-subtle)}.level-button:active{transform:translateY(-2px)}.level-icon{font-size:2.5rem;margin-bottom:.5rem}.level-button h3{margin:.5rem 0;color:var(--text-primary);font-size:1.2rem;flex-shrink:0}.level-name{font-size:1.1rem;font-weight:600;color:var(--text-primary);margin:.25rem 0;flex-shrink:0}.level-description{font-size:.9rem;color:var(--text-secondary);margin:.5rem 0;flex-grow:1;display:flex;align-items:center;justify-content:center;line-height:1.4}.level-icon{flex-shrink:0}.question-count{position:absolute;top:10px;right:10px;background:#ffffff1a;padding:.25rem .5rem;border-radius:0;font-size:.85rem;font-weight:600;color:var(--text-secondary)}.breadcrumb{background:var(--bg-surface);padding:1rem 2rem;font-size:.9rem;color:var(--text-muted);border-bottom:1px solid var(--border-subtle)}.breadcrumb a{color:var(--accent-amber);text-decoration:none;transition:color .15s ease}.breadcrumb a:hover{color:var(--text-primary);text-decoration:underline}.question-type-badge{display:inline-flex;align-items:center;gap:.5rem;background:var(--btn-bg-primary);color:#fff;padding:.5rem 1rem;border-radius:0;font-size:.9rem;font-weight:600;margin-bottom:1rem;box-shadow:0 2px 8px #0000004d}.choice-label{display:flex;align-items:center;gap:1rem;padding:1rem;background:var(--bg-subtle);border:2px solid var(--border-primary);border-radius:0;margin-bottom:.75rem;cursor:pointer;transition:all .15s ease;-webkit-user-select:none;user-select:none}.choice-label:hover{background:var(--bg-elevated);border-color:var(--secondary-color);transform:translateY(-2px);box-shadow:0 4px 12px #00000040}.choice-checkbox{width:20px;height:20px;accent-color:var(--secondary-color);transform:scale(1.2)}.choice-content{display:flex;align-items:center;gap:.75rem;flex:1}.choice-label .choice-number{background:var(--secondary-color);color:#fff;width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.9rem;flex-shrink:0}.choice-label code{background:transparent;color:var(--text-primary);font-size:1rem;font-weight:500}.choice-label:has(.choice-checkbox:checked){background:var(--btn-bg-primary);border-color:var(--secondary-color);color:#fff}.choice-label:has(.choice-checkbox:checked) code{color:#fff}.choice-label:has(.choice-checkbox:disabled){opacity:.7;cursor:not-allowed}.choice-label.correct-choice,.choice-label.correct-choice:hover,.choice-label.correct-choice:has(.choice-checkbox:checked),.choice-label.correct-choice:has(.choice-checkbox:checked):hover{background:var(--btn-bg-success);border-color:var(--success-color);color:#fff;transform:none;cursor:default}.choice-label.correct-choice code,.choice-label.correct-choice:has(.choice-checkbox:checked) code{color:#fff}.choice-label.incorrect-choice,.choice-label.incorrect-choice:hover,.choice-label.incorrect-choice:has(.choice-checkbox:checked),.choice-label.incorrect-choice:has(.choice-checkbox:checked):hover{background:var(--btn-bg-danger);border-color:var(--danger-color);color:#fff;transform:none;cursor:default}.choice-label.incorrect-choice code,.choice-label.incorrect-choice:has(.choice-checkbox:checked) code{color:#fff}.answer-comparison{background:var(--bg-subtle);padding:1rem;border-radius:0;margin-bottom:1rem;border-left:4px solid var(--secondary-color)}.correct-answers{margin:.5rem 0;font-size:.95rem;color:var(--text-secondary)}.correct-answers strong{color:var(--text-primary);font-weight:600}.selection-info{margin:1rem 0;text-align:center}.quiz-question{display:flex;flex-direction:column;gap:1.5rem}.quiz-header{border-bottom:2px solid var(--border-primary);padding-bottom:1rem}.progress-info{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.level-badge{padding:.5rem 1rem;border-radius:0;color:#fff;font-weight:600;font-size:.9rem}.question-number{color:var(--text-secondary);font-weight:500}.progress-bar{width:100%;height:8px;background:var(--bg-subtle);border-radius:0;overflow:hidden}.progress-fill{height:100%;background:var(--btn-bg-primary-alt);border-radius:0;transition:width .15s ease}.question-content h3{color:var(--text-primary);font-size:1.3rem;line-height:1.6;margin:0 0 2rem}.choices{display:flex;flex-direction:column;gap:1rem}.choice-button{display:flex;align-items:center;gap:1rem;padding:1rem 1.5rem;background:var(--bg-subtle);border:2px solid var(--border-primary);border-radius:0;cursor:pointer;transition:all .15s ease;text-align:left;font-size:1rem;position:relative;color:var(--text-primary)}.choice-button:hover:not(:disabled){background:var(--bg-elevated);border-color:var(--secondary-color);transform:translate(5px)}.choice-button:disabled{cursor:not-allowed;opacity:.7}.choice-button.correct{background:#22c55e33;border-color:var(--success-color)}.choice-button.incorrect{background:#ef444433;border-color:var(--danger-color)}.choice-number{display:flex;align-items:center;justify-content:center;width:30px;height:30px;background:var(--bg-elevated);border-radius:50%;font-weight:600;color:var(--secondary-color);flex-shrink:0}.choice-button code{font-family:Courier New,monospace;font-size:1rem;color:var(--text-primary);background:#0000004d;padding:.2rem .4rem;border-radius:0}.feedback{margin-top:1rem;animation:slideIn .15s ease}.feedback.hidden{display:none}.explanation{background:#0000004d;padding:.75rem;border-radius:0;margin-top:.75rem}.quiz-actions{display:flex;justify-content:center;margin-top:2rem}.next-button{padding:.75rem 2rem;background:var(--btn-bg-primary);color:#fff;border:none;border-radius:0;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .15s ease}.next-button:hover{transform:translateY(-2px);box-shadow:0 5px 15px #0006}.next-button.hidden{display:none}.quiz-results{text-align:center}.quiz-results h2{color:var(--text-primary);margin-bottom:2rem;font-size:2rem}.result-message{margin:2rem 0;padding:1.5rem;background:var(--bg-subtle);border-radius:0;border:1px solid var(--border-primary)}.result-message h3{margin:0 0 .5rem;color:var(--text-primary)}.result-message p{margin:0;color:var(--text-secondary)}.result-stats{display:flex;justify-content:center;gap:3rem;margin:2rem 0}.answer-review{margin:3rem 0;text-align:left}.answer-review h3{color:var(--text-primary);margin-bottom:1rem}.answer-list{display:flex;flex-direction:column;gap:.75rem;max-height:400px;overflow-y:auto;padding:1rem;background:var(--bg-subtle);border-radius:0}.answer-item{display:flex;align-items:flex-start;gap:1rem;padding:.75rem;background:var(--bg-elevated);border-radius:0;border:1px solid var(--border-primary)}.answer-item.correct{border-color:var(--success-color)}.answer-item.incorrect{border-color:var(--danger-color)}.answer-number{font-weight:600;color:var(--secondary-color);min-width:35px}.answer-icon{font-size:1.2rem}.answer-details{flex:1}.answer-question{color:var(--text-primary);margin:0 0 .5rem;font-weight:500}.answer-correction{color:var(--text-secondary);font-size:.9rem;margin:0}.answer-correction code{background:var(--bg-subtle);padding:.1rem .3rem;border-radius:0;font-family:monospace;color:var(--text-primary)}.result-actions{display:flex;gap:1rem;justify-content:center;margin-top:2rem}.action-button{padding:.75rem 1.5rem;border:none;border-radius:0;font-size:1rem;font-weight:600;cursor:pointer;transition:all .15s ease}.action-button.primary{background:var(--btn-bg-primary);color:#fff}.action-button.secondary{background:#6c757d;color:#fff}.action-button.share{background:#1da1f2;color:#fff}.action-button:hover{transform:translateY(-2px);box-shadow:0 5px 15px #0003}.quiz-stats{margin-top:2rem;padding:1.5rem;background:var(--bg-subtle);border-radius:0;border:1px solid var(--border-primary)}.quiz-stats h3{margin:0 0 1rem;color:var(--text-primary)}.loading-spinner{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px}.spinner{width:50px;height:50px;border:5px solid var(--bg-subtle);border-top:5px solid var(--secondary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@media(max-width:1024px){.quiz-wrapper{flex-direction:column}.quiz-sidebar{width:100%;order:2}.quiz-container{order:1}}@media(max-width:768px){.hamburger-menu{display:flex;margin-left:auto;align-self:center}.main-nav{display:none}.quiz-main{padding:1rem .5rem}.quiz-container{padding:1.5rem;border-radius:0}.level-grid{grid-template-columns:1fr;gap:1rem}.level-button{min-height:180px;padding:1.25rem 1rem}.question-content h3{font-size:1.1rem}.choice-button{padding:.75rem 1rem;font-size:.95rem}.result-stats{flex-direction:column;gap:1rem}.result-actions{flex-direction:column;align-items:stretch}.quiz-sidebar{display:none}}@media(max-width:480px){.quiz-container{padding:1rem}.level-button{padding:1rem .75rem;min-height:160px}.level-icon{font-size:2rem}.choice-button{padding:.75rem;gap:.75rem}.choice-number{width:25px;height:25px;font-size:.9rem}}.article-container{max-width:1200px;margin:0 auto;background:var(--bg-surface);color:var(--text-secondary);min-height:100vh}.article-main{display:flex;max-width:1000px;margin:0 auto;padding:2rem;gap:2rem;justify-content:center}.article-main article{flex:1;max-width:900px;width:100%}.article-main a:not(.cta-button):not(.cta-button-secondary):not(.back-link){color:var(--accent-amber);text-decoration:underline;transition:color .15s ease}.article-main a:not(.cta-button):not(.cta-button-secondary):not(.back-link):hover{color:var(--text-primary)}@media(max-width:767px){.article-main{flex-direction:column;padding:1rem}}.breadcrumb{background:var(--bg-void);padding:1rem 2rem;font-size:.875rem;color:var(--text-muted);border-bottom:1px solid var(--border-primary)}.breadcrumb a{color:var(--text-primary);text-decoration:none}.breadcrumb a:hover{color:var(--accent-green);text-decoration:underline}.article-hero-image{width:100%;max-width:900px;aspect-ratio:3/2;margin:0 auto 2rem;border-radius:0;overflow:hidden;box-shadow:var(--shadow-sm)}.article-hero-image img{width:100%;height:100%;object-fit:contain;object-position:center center}@media(max-width:767px){.article-hero-image{aspect-ratio:1/1;margin-bottom:1.5rem}}.article-meta{display:flex;gap:1rem;margin-bottom:2rem;font-size:.875rem;color:var(--text-muted);flex-wrap:wrap}.article-intro{font-size:1.125rem;line-height:1.6;color:var(--text-secondary);margin-bottom:2rem;padding:1.5rem;background:var(--bg-elevated);border-left:4px solid var(--accent-green);border-radius:0}.article-intro .lead{font-size:1.25rem;font-weight:500;margin:0;color:var(--text-primary)}.article-toc,.toc{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:1.5rem;margin:2rem 0}.article-toc h2,.article-toc h3,.toc h2,.toc h3{margin-bottom:1rem;color:var(--text-primary);font-size:1.125rem}.article-toc ol,.article-toc ul,.toc ol,.toc ul{margin:0;padding-left:1.5rem}.article-toc li,.toc li{margin-bottom:.5rem;color:var(--text-secondary)}.article-toc a,.toc a{color:var(--text-primary);text-decoration:none}.article-toc a:hover,.toc a:hover{color:var(--accent-green);text-decoration:underline}section{margin:3rem 0}section h2{color:var(--text-primary);border-bottom:2px solid var(--accent-green);padding-bottom:.5rem;margin-bottom:1.5rem}section h3{color:var(--text-primary);margin-top:2rem;margin-bottom:1rem}.command-example,.code-example{margin:1.5rem 0}.command-example h4,.code-example h4{color:var(--text-primary);margin-bottom:.5rem;font-size:1rem}.code-example code{display:block;background:var(--bg-elevated);color:var(--terminal-text);padding:1rem;border-radius:0;font-family:Consolas,Monaco,Courier New,monospace;font-size:.875rem;line-height:1.4;white-space:pre-wrap;word-break:break-word;overflow-wrap:break-word;max-width:100%;overflow-x:auto;border:1px solid var(--border-primary)}.step code,.solution-code code{display:block;background:var(--bg-elevated);color:var(--terminal-text);padding:1rem;border-radius:0;font-family:Consolas,Monaco,Courier New,monospace;font-size:.85rem;line-height:1.4;white-space:pre-wrap;word-break:break-word;overflow-wrap:break-word;max-width:100%;overflow-x:auto;border:1px solid var(--border-primary);margin:.5rem 0}.solution-steps{margin:1rem 0}.step{margin-bottom:1.5rem}.step h6{color:var(--text-primary);margin-bottom:.5rem;font-size:.95rem;font-weight:600}.code-example pre{background:var(--bg-elevated);color:var(--text-primary);padding:1.5rem;border-radius:0;font-family:SF Mono,Monaco,Consolas,Liberation Mono,Courier New,monospace;font-size:.875rem;line-height:1.3;overflow-x:auto;margin:.5rem 0;border:2px solid var(--border-primary);white-space:pre;letter-spacing:.2px;box-shadow:none;unicode-bidi:embed;font-feature-settings:"liga" 0;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.terminal-screenshot{width:100%;height:auto;border-radius:0;border:2px solid var(--border-primary);display:block;box-shadow:none}.header-label{top:5%;left:75%}@media(max-width:575px){.header-label{top:3%}}.sidebar-label{top:45%;left:12%}@media(max-width:575px){.sidebar-label{top:40%;left:10%}}.terminal-label{bottom:15%;left:75%}@media(max-width:575px){.terminal-label{bottom:12%;left:78%}}.command,.code{background:var(--bg-elevated);color:var(--terminal-text);padding:1rem;border-radius:0;font-family:Consolas,Monaco,Courier New,monospace;font-size:.875rem;overflow-x:auto;margin:.5rem 0;border:1px solid var(--border-primary)}@media(max-width:767px){.command,.code{font-size:.8rem;padding:.75rem}}.output{background:var(--bg-surface);color:var(--terminal-success);padding:1rem;border-radius:0;font-family:Consolas,Monaco,Courier New,monospace;font-size:.875rem;overflow-x:auto;margin:.5rem 0;border:1px solid var(--border-subtle)}@media(max-width:767px){.output{font-size:.8rem;padding:.75rem}}.explanation{color:var(--text-muted);font-style:italic;margin-top:.5rem;font-size:.875rem}code{background:var(--bg-elevated);color:var(--accent-green);padding:.2rem .4rem;border-radius:0;font-family:Consolas,Monaco,Courier New,monospace;font-size:.9em}.info-box,.tip-box,.warning-box,.danger-box{margin:1.5rem 0;padding:1rem;border-radius:0;border-left:4px solid;background:var(--bg-elevated)}.info-box{border-color:var(--text-secondary);color:var(--text-secondary)}.tip-box{border-color:var(--accent-green);color:var(--text-secondary)}.warning-box{border-color:var(--text-muted);color:var(--text-secondary)}.danger-box{border-color:var(--accent-red);color:var(--text-secondary)}.highlight-box{background:var(--bg-elevated);color:var(--text-primary);padding:1.5rem;border-radius:0;margin:2rem 0;box-shadow:none;border:2px solid var(--accent-green)}.highlight-box h3{margin-bottom:1rem;color:var(--text-primary);font-weight:600}.highlight-box ul{margin:0;padding-left:1.5rem}.highlight-box li{color:var(--text-secondary);font-weight:500;margin-bottom:.5rem;line-height:1.6}table{width:100%;border-collapse:collapse;margin:1.5rem 0;border:2px solid var(--border-primary);border-radius:0;overflow:hidden;box-shadow:none}th,td{padding:.75rem;text-align:left;border-bottom:1px solid var(--border-primary);border-right:1px solid var(--border-primary);color:var(--text-secondary)}th:last-child,td:last-child{border-right:none}tbody tr:last-child td{border-bottom:none}th{background:var(--bg-elevated);font-weight:600;color:var(--text-primary);border-bottom:2px solid var(--border-primary)}tr:hover{background:var(--bg-subtle)}.option-table,.command-table,.permission-table{font-size:.875rem;width:100%;border-collapse:collapse;margin:1.5rem 0;border:2px solid var(--border-primary);border-radius:0;overflow:hidden;box-shadow:none}.option-table th,.command-table th,.permission-table th{background:var(--bg-elevated);padding:1rem .75rem;text-align:left;border-bottom:2px solid var(--border-primary);font-weight:600;color:var(--text-primary);border-right:1px solid var(--border-primary)}.option-table th:last-child,.command-table th:last-child,.permission-table th:last-child{border-right:none}.option-table td,.command-table td,.permission-table td{padding:.75rem;text-align:left;border-bottom:1px solid var(--border-primary);border-right:1px solid var(--border-primary);color:var(--text-secondary)}.option-table td:last-child,.command-table td:last-child,.permission-table td:last-child{border-right:none}.option-table tr:last-child td,.command-table tr:last-child td,.permission-table tr:last-child td{border-bottom:none}.option-table tr:hover,.command-table tr:hover,.permission-table tr:hover{background:var(--bg-subtle)}.option-table code,.command-table code,.permission-table code{background:var(--bg-subtle);padding:.2rem .4rem;border-radius:0;color:var(--accent-green);font-weight:500}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin:2rem 0}@media(max-width:767px){.features-grid{grid-template-columns:1fr}}.concept-card,.feature-card{background:var(--bg-elevated);padding:1.5rem;border-radius:0;border:1px solid var(--border-primary)}.concept-card h3,.feature-card h3{color:var(--text-primary);margin-bottom:1rem}.concept-card p,.feature-card p{color:var(--text-secondary)}.action-buttons{display:flex;gap:1rem;margin:2rem 0;flex-wrap:wrap}@media(max-width:767px){.action-buttons{flex-direction:column}}.btn-primary,.btn-secondary{display:inline-block;padding:.75rem 1.5rem;border-radius:0;text-decoration:none;font-weight:500;text-align:center;transition:var(--transition-normal);border:none;cursor:pointer;font-size:1rem}@media(max-width:767px){.btn-primary,.btn-secondary{width:100%}}.btn-primary{background:var(--accent-green);color:var(--bg-void)}.btn-primary:hover{opacity:.9;transform:translateY(-2px);box-shadow:none}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary);border:2px solid var(--border-primary)}.btn-secondary:hover{background:var(--bg-subtle);color:var(--text-primary);transform:translateY(-2px);box-shadow:none}.summary-box{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:2rem;margin:3rem 0;border-left:4px solid var(--accent-green)}.summary-box h2{color:var(--text-primary);margin-bottom:1rem}.summary-box p,.summary-box li{color:var(--text-secondary)}.next-steps{background:var(--bg-elevated);border-radius:0;padding:2rem;margin:3rem 0;text-align:center;border:1px solid var(--border-primary)}.article-sidebar{display:none}@media(max-width:767px){.article-sidebar{width:100%;order:1}}.sidebar-section{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:1.5rem;margin-bottom:2rem}.sidebar-section.sticky{position:sticky;top:2rem}@media(max-width:767px){.sidebar-section.sticky{position:static}}.sidebar-section h3{margin-bottom:1rem;color:var(--text-primary);font-size:1.125rem}.sidebar-section ul{list-style:none;padding:0;margin:0}.sidebar-section li{margin-bottom:.5rem;padding:.5rem;background:var(--bg-subtle);border-radius:0;border:1px solid var(--border-primary)}.sidebar-section a{color:var(--text-primary);text-decoration:none;font-size:.875rem}.sidebar-section a:hover{color:var(--accent-green)}.challenge-list{margin:1.5rem 0}.challenge-item{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:1rem;margin:1rem 0}.challenge-item h4{color:var(--text-primary);margin-bottom:.5rem}.challenge-item p{color:var(--text-secondary)}article ol{margin:1rem 0;padding-left:1.5rem;list-style-type:decimal}article ol li{margin-bottom:.5rem;padding-left:.25rem;line-height:1.5;color:var(--text-secondary)}.faq-page .faq-category{margin-bottom:2rem}.faq-item{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;margin-bottom:1rem;overflow:hidden}.faq-question{background:var(--bg-subtle);padding:1rem;margin:0;cursor:pointer;-webkit-user-select:none;user-select:none;display:flex;justify-content:space-between;align-items:center;transition:background var(--transition-normal);color:var(--text-primary)}.faq-question:hover{background:var(--bg-elevated)}.faq-question:after{content:"▼";transition:transform var(--transition-normal);font-size:.8rem;color:var(--text-muted)}.faq-question.active:after{transform:rotate(180deg)}.faq-answer{padding:1rem;display:none;border-top:1px solid var(--border-primary);color:var(--text-secondary)}.faq-answer.active{display:block}@media print{.header,.breadcrumb,.article-sidebar,.action-buttons{display:none}.article-main{flex-direction:column;max-width:none;padding:0}.article-main article{max-width:none}.command,.code,.output{background:var(--light-color)!important;color:var(--text-color)!important;border:1px solid var(--border-color)}a{color:var(--text-color)!important}.highlight-box,.btn-primary,.btn-secondary{background:var(--light-color)!important;color:var(--text-color)!important;border:1px solid var(--border-color)}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}@media(prefers-contrast:high){.btn-primary,.btn-secondary,.command,.code,.output{border:2px solid var(--text-color)}}pre{overflow-x:auto;white-space:pre-wrap;word-wrap:break-word;max-width:100%}pre.command,pre.output{white-space:pre;overflow-x:auto}.permission-diagram{font-size:.8rem;overflow-x:auto;white-space:pre;max-width:100%}@media(max-width:767px){.permission-diagram{font-size:.65rem}}@media(max-width:767px){pre{font-size:.75rem;padding:.75rem}.permission-breakdown{overflow-x:auto;-webkit-overflow-scrolling:touch}}.comparison-item{padding:.75rem;text-align:left;border-right:1px solid var(--border-primary);font-size:.875rem;color:var(--text-secondary)}.comparison-item:first-child{text-align:left;font-weight:500}.comparison-item:last-child{border-right:none}@media(max-width:767px){.comparison-item{border-right:none;border-bottom:1px solid var(--border-primary);display:flex;justify-content:space-between;align-items:center;padding:.6rem 1rem}.comparison-item:last-child{border-bottom:none}.comparison-item:before{content:attr(data-label);font-weight:600;color:var(--text-muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.5px}}.practice-button{display:inline-flex;align-items:center;gap:.5rem;background:var(--accent-green);color:var(--bg-void);border:none;padding:.75rem 1rem;border-radius:0;font-size:.875rem;font-weight:500;cursor:pointer;margin-top:.75rem;transition:var(--transition-normal);box-shadow:none}.practice-button:hover{transform:translateY(-2px);opacity:.9;box-shadow:none}.practice-button:active{transform:translateY(0)}@media(max-width:767px){.practice-button{padding:.625rem .875rem;font-size:.85rem}}.practice-button-inline{display:inline-flex;align-items:center;gap:.25rem;background:var(--accent-green);color:var(--bg-void);border:none;padding:.375rem .75rem;border-radius:0;font-size:.8rem;font-weight:500;cursor:pointer;margin-left:.5rem;transition:var(--transition-normal);box-shadow:none;vertical-align:middle}.practice-button-inline:hover{transform:translateY(-1px);opacity:.9;box-shadow:none}.practice-button-inline:active{transform:translateY(0)}@media(max-width:767px){.practice-button-inline{padding:.25rem .5rem;font-size:.75rem;margin-left:.375rem}}.practice-icon{font-size:1rem}@media(max-width:767px){.practice-icon{font-size:.875rem}}.practice-text{font-weight:500}.command-box .practice-button{margin-top:1rem;width:100%;justify-content:center}.command-list li .practice-button-inline{margin-left:1rem}.article-author-section{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:1.5rem;margin-bottom:2rem;box-shadow:none}@media(max-width:767px){.article-author-section{padding:1.25rem;margin-bottom:1.5rem}}.article-read-button-container{margin:3rem 0 2rem;padding:0;max-width:1000px;margin-left:auto;margin-right:auto;padding-left:2rem;padding-right:2rem}@media(max-width:767px){.article-read-button-container{padding-left:1rem;padding-right:1rem;margin:2rem 0 1.5rem}}.article-read-section{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:2rem;text-align:center;box-shadow:none}@media(max-width:767px){.article-read-section{padding:1.5rem;margin:0}}.article-read-header h3{color:var(--text-primary);margin-bottom:.5rem;font-size:1.25rem}.article-read-header p{color:var(--text-secondary);margin-bottom:1.5rem;font-size:.95rem}.article-read-button-wrapper{margin:1.5rem 0}.article-read-button{background:var(--accent-green);color:var(--bg-void);border:none;padding:1rem 2rem;border-radius:50px;font-size:1.125rem;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:.5rem;transition:var(--transition-normal);box-shadow:none;min-width:200px}.article-read-button:hover{transform:translateY(-2px);opacity:.9;box-shadow:none}.article-read-button:active{transform:translateY(0)}.article-read-button:disabled{opacity:.7;cursor:not-allowed;transform:none}.article-already-read{display:flex;flex-direction:column;align-items:center;gap:.75rem}.article-unread-button{background:var(--bg-subtle);color:var(--text-primary);border:1px solid var(--border-primary);padding:.5rem 1rem;border-radius:0;font-size:.875rem;cursor:pointer;transition:background-color var(--transition-normal)}.article-unread-button:hover{background:var(--bg-elevated)}.article-read-stats{margin:1.5rem 0;padding:1rem 0;border-top:1px solid var(--border-primary)}.reading-stats{display:flex;justify-content:center;gap:2rem;flex-wrap:wrap}@media(max-width:767px){.reading-stats{gap:1rem;justify-content:space-around}}.article-read-encouragement{margin-top:1.5rem;padding-top:1rem;border-top:1px solid var(--border-primary)}.article-read-encouragement p{margin-bottom:1rem;color:var(--text-secondary);font-size:.95rem}.article-navigation-links{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap}@media(max-width:767px){.article-navigation-links{gap:.5rem}}.article-nav-link{display:inline-flex;align-items:center;gap:.3rem;padding:.5rem 1rem;background:var(--bg-elevated);color:var(--text-primary);text-decoration:none;border:1px solid var(--border-primary);border-radius:0;font-size:.875rem;transition:var(--transition-normal)}.article-nav-link:hover{background:var(--accent-green);color:var(--bg-void);transform:translateY(-1px);text-decoration:none;border-color:var(--accent-green)}@media(max-width:767px){.article-nav-link{font-size:.8rem;padding:.4rem .8rem}}.article-notification{position:fixed;top:20px;right:20px;background:var(--bg-elevated);padding:1rem 1.5rem;border-radius:0;box-shadow:none;display:flex;align-items:center;gap:.5rem;z-index:1000;opacity:0;transform:translateY(-20px);transition:var(--transition-normal);max-width:300px;border:1px solid var(--border-primary)}.article-notification.success{border-left:4px solid var(--accent-green)}.article-notification.error{border-left:4px solid var(--accent-red)}.article-notification.info{border-left:4px solid var(--text-secondary)}@media(max-width:767px){.article-notification{right:10px;left:10px;max-width:none}}.badge-notification{position:fixed;top:80px;right:20px;background:var(--bg-elevated);color:var(--text-primary);padding:1.5rem;border-radius:0;box-shadow:none;z-index:1001;opacity:0;transform:translate(100%) scale(.8);transition:all .5s cubic-bezier(.175,.885,.32,1.275);max-width:320px;border:2px solid var(--accent-green)}@media(max-width:767px){.badge-notification{right:10px;left:10px;max-width:none}}.badge-content{display:flex;align-items:center;gap:1rem}@media(max-width:767px){.badge-content{gap:.75rem}}.badge-icon{font-size:2rem;animation:badgePulse 2s infinite}@media(max-width:767px){.badge-icon{font-size:1.5rem}}.badge-name{font-size:.875rem;font-weight:600;color:var(--accent-green);margin-bottom:.25rem}.badge-title{font-size:1.125rem;font-weight:700;margin-bottom:.25rem}.badge-description{font-size:.85rem;color:var(--text-secondary)}@keyframes badgePulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.category-header .category-badge{position:static}.tutorial-choice-nav{display:flex;gap:1.5rem;justify-content:center;margin:2rem auto 3rem;max-width:700px;padding:0 1rem}@media(max-width:575px){.tutorial-choice-nav{flex-direction:column;gap:1rem}}.choice-card{flex:1;display:flex;flex-direction:column;align-items:center;padding:1.5rem 2rem;background:var(--bg-elevated);border:2px solid var(--border-primary);border-radius:0;text-decoration:none;transition:var(--transition-normal);text-align:center}.choice-card:hover{transform:translateY(-4px);border-color:var(--accent-green);box-shadow:none;text-decoration:none}@media(max-width:575px){.choice-card{padding:1.25rem 1.5rem}}.choice-icon{font-size:2rem;margin-bottom:.5rem}@media(max-width:575px){.choice-icon{font-size:1.75rem}}.choice-title{font-size:1.125rem;font-weight:600;color:var(--text-primary);margin-bottom:.25rem}@media(max-width:575px){.choice-title{font-size:1rem}}.choice-desc{font-size:.85rem;color:var(--text-secondary)}.choice-learning{border-color:var(--accent-green)}.choice-troubleshoot{border-color:var(--accent-red);background:var(--bg-elevated)}.choice-troubleshoot:hover{border-color:var(--accent-red);box-shadow:none}.troubleshooting-section{background:var(--bg-elevated);border:2px solid var(--accent-red);border-radius:0;padding:2rem;margin:3rem 0}.troubleshooting-section .category-header h2{border-bottom-color:var(--accent-red)}.troubleshooting-section .category-badge{position:static;background:var(--accent-red);color:var(--bg-void)}@media(max-width:767px){.troubleshooting-section{padding:1.5rem 1rem;margin:2rem 0}}.section-intro{text-align:center;color:var(--text-secondary);margin-bottom:2rem;font-size:1rem}.troubleshoot-category{margin-bottom:2rem}.troubleshoot-category:last-child{margin-bottom:0}.troubleshoot-category h3{color:var(--text-primary);font-size:1.125rem;margin-bottom:1rem;padding-bottom:.5rem;border-bottom:1px solid var(--border-primary)}@media(max-width:767px){.troubleshoot-category h3{font-size:1rem}}.guides-index{max-width:1200px;margin:0 auto;padding:2rem 1rem}.guides-hero{background:var(--bg-elevated);color:var(--text-primary);padding:3rem 2rem;border-radius:0;text-align:center;margin-bottom:3rem;border:1px solid var(--border-primary)}.guides-hero h1{font-size:2.25rem;margin-bottom:1rem;font-weight:700}.guides-hero p{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto}.guides-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem;margin-bottom:3rem}.guide-card{background:var(--bg-elevated);border-radius:0;box-shadow:none;padding:0;overflow:hidden;transition:var(--transition-normal);text-decoration:none;color:inherit;display:block;position:relative;cursor:pointer;border:1px solid var(--border-primary)}.guide-card>.guide-card-content>a[href]:last-child:after{content:"";position:absolute;inset:0;z-index:1}.guide-card:hover{transform:translateY(-4px);border-color:var(--accent-green);box-shadow:none}.guide-card-image{width:100%;aspect-ratio:3/2;overflow:hidden;background:var(--bg-subtle);position:relative}.guide-card-image img{width:100%;height:100%;object-fit:cover;object-position:center center;transition:transform .3s ease}.guide-card:hover .guide-card-image img{transform:scale(1.05)}.guide-card-content{padding:1.5rem}.guide-card h3{margin-bottom:.5rem;color:var(--text-primary);font-size:1.3rem;font-weight:600}.guide-card p{color:var(--text-secondary);line-height:1.6;margin-bottom:1rem;font-size:.95rem}.guide-card a{color:var(--accent-green);text-decoration:none;font-weight:500;display:inline-flex;align-items:center;gap:.25rem;transition:color .2s ease}.guide-card a:hover{color:var(--text-primary)}.guide-meta{display:flex;align-items:center;gap:1rem;margin-bottom:1rem;font-size:.875rem;color:var(--text-muted)}.guide-meta span{display:flex;align-items:center;gap:.25rem}.learning-path{background:var(--bg-elevated);border-radius:0;padding:3rem;box-shadow:none;margin-bottom:3rem;border:1px solid var(--border-primary)}.guides-grid.compact{gap:1rem}.guides-grid.compact .guide-card{background:var(--bg-elevated)}.guides-grid.compact .guide-card-content{padding:1rem 1.25rem}@media(max-width:767px){.guides-grid.compact .guide-card-content{padding:.875rem 1rem}}.guides-grid.compact h4{font-size:1rem;margin-bottom:.5rem;color:var(--text-primary)}.guides-grid.compact p{font-size:.85rem;color:var(--text-secondary);margin-bottom:.75rem;line-height:1.5}.guides-grid.compact a{font-size:.875rem;color:var(--accent-green);font-weight:500}.guides-grid.compact a:hover{color:var(--text-primary)}.guide-card.troubleshoot{border-left:4px solid var(--accent-red)}.next-reading{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:1.5rem 2rem;margin:3rem 0 2rem}.next-reading h2{color:var(--text-primary);font-size:1.25rem;margin-bottom:1rem;padding-bottom:.5rem;border-bottom:2px solid var(--accent-green)}@media(max-width:767px){.next-reading h2{font-size:1.125rem}}@media(max-width:767px){.next-reading{padding:1.25rem 1.5rem;margin:2rem 0 1.5rem}}.next-reading-list{list-style:none;padding:0;margin:0}.next-reading-list li{margin-bottom:.75rem;padding-left:1.5rem;position:relative;color:var(--text-secondary)}.next-reading-list li:before{content:"→";position:absolute;left:0;color:var(--accent-green);font-weight:700}.next-reading-list li:last-child{margin-bottom:0}@media(max-width:767px){.next-reading-list li{margin-bottom:.6rem;font-size:.95rem}}.next-reading-list a{color:var(--accent-green);text-decoration:none;font-weight:500;transition:color var(--transition-fast)}.next-reading-list a:hover{color:var(--text-primary);text-decoration:underline}.feature-header{display:flex;align-items:center;gap:.5rem;margin-bottom:1rem}.feature-header h3{margin:0;color:var(--text-primary);font-size:1.125rem}.feature-emoji{font-size:1.25rem}.article-main .badge-examples{display:flex;flex-direction:column;gap:.5rem}.article-main .badge-examples .badge-item{display:flex;flex-direction:row;align-items:center;gap:.5rem;background:var(--bg-subtle);padding:.5rem 1rem;border-radius:0;border:1px solid var(--border-primary);aspect-ratio:auto;height:auto;min-height:0;max-height:none;flex:0 0 auto;width:100%;justify-content:flex-start;text-align:left;cursor:default}.article-main .badge-examples .badge-item:hover{transform:none;box-shadow:none}.article-main .badge-examples .badge-icon{font-size:1.125rem;flex-shrink:0;margin-bottom:0}.article-main .badge-examples .badge-name{font-weight:600;color:var(--text-primary);font-size:.875rem}.article-main .badge-examples .badge-desc{color:var(--text-secondary);font-size:.875rem;margin-left:auto;text-align:right}@media(max-width:767px){.article-main .badge-examples .badge-desc{display:none}}.level-progression{display:flex;flex-direction:column;gap:.5rem}.level-item{display:flex;align-items:center;gap:.5rem;background:var(--bg-subtle);padding:.5rem 1rem;border-radius:0;border:1px solid var(--border-primary)}.level-icon{font-size:1.125rem;flex-shrink:0}.level-name{font-weight:600;color:var(--text-primary);font-size:.875rem}.level-requirement{color:var(--text-secondary);font-size:.875rem;margin-left:auto}.article-main .tip-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1rem}@media(max-width:767px){.article-main .tip-grid{grid-template-columns:1fr}}.article-main .tip-grid .tip-item{display:block;background:var(--bg-subtle);border:1px solid var(--border-primary);border-radius:0;padding:1rem;max-width:none;width:100%;text-align:left}.article-main .tip-grid .tip-item h4{display:block;width:100%;color:var(--text-primary);font-size:1rem;margin-bottom:.5rem;writing-mode:horizontal-tb}.article-main .tip-grid .tip-item p{display:block;width:100%;color:var(--text-secondary);font-size:.875rem;line-height:1.5;margin:0}.example-item{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:1.5rem;margin-bottom:1rem}.example-item h4{color:var(--text-primary);font-size:1rem;margin-bottom:.5rem}.example-item pre.code{background:var(--bg-surface);border:1px solid var(--border-subtle);padding:1rem;overflow-x:auto}.pattern-item{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:1rem;margin-bottom:.5rem}.pattern-item h6{color:var(--accent-amber);font-size:.875rem;margin-bottom:.25rem}.pattern-item code{display:block;background:var(--bg-surface);color:var(--text-primary);padding:.5rem;font-family:Consolas,Monaco,Courier New,monospace;font-size:.875rem;overflow-x:auto}.pattern-item .strict-version{margin-top:.5rem;padding-top:.5rem;border-top:1px solid var(--border-subtle)}.pattern-item .strict-version p{color:var(--text-muted);font-size:.75rem;margin-bottom:.25rem}.mistake-item{background:var(--bg-elevated);border:1px solid var(--border-primary);border-left:4px solid var(--accent-red);border-radius:0;padding:1.5rem;margin-bottom:1rem}.mistake-item h4{color:var(--text-primary);font-size:1rem;margin-bottom:.5rem}.mistake-item .error-example{background:var(--bg-surface);border:1px solid var(--accent-red);padding:.5rem;margin-bottom:.5rem}.mistake-item .error-example code{color:var(--accent-red);font-family:Consolas,Monaco,Courier New,monospace}.solution{background:var(--bg-surface);border:1px solid var(--border-subtle);border-left:4px solid var(--accent-green);border-radius:0;padding:1rem;margin-top:.5rem}.solution h5{color:var(--accent-green);font-size:.875rem;margin-bottom:.5rem}.solution ul{margin:0;padding-left:1.5rem}.solution ul li{color:var(--text-secondary);margin-bottom:.25rem}.method{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:0;padding:1rem;margin-bottom:.5rem}.method h6{color:var(--text-primary);font-size:.875rem;margin-bottom:.25rem}.method code{display:block;background:var(--bg-elevated);color:var(--accent-amber);padding:.5rem;font-family:Consolas,Monaco,Courier New,monospace;font-size:.875rem}.arrow{color:var(--text-muted);text-align:center;font-size:1.125rem;padding:.25rem 0}.sitemap-toc{background:var(--bg-subtle, #2a2a2a);border-radius:0;padding:1rem 1.5rem;margin-bottom:2rem}.sitemap-toc ul{display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;list-style:none;padding:0;margin:0}.sitemap-toc a{color:var(--accent-amber, #c9a227);text-decoration:none;font-weight:500}.sitemap-toc a:hover{text-decoration:underline}.search-section{background:var(--bg-elevated, #1e1e1e);color:var(--text-primary, #f0f0f0);padding:1.5rem;border-radius:0;margin-bottom:2rem}.search-section h2{color:#fff;margin-top:0;margin-bottom:.5rem;font-size:1.25rem}.search-section p{margin-bottom:1rem;opacity:.9}.search-box{display:flex;gap:.5rem;align-items:center}.search-input-wrapper{flex:1;position:relative}.search-input{width:100%;padding:.75rem 2.5rem .75rem 1rem;border:none;border-radius:0;font-size:1rem}.search-clear{position:absolute;right:.5rem;top:50%;transform:translateY(-50%);background:none;border:none;font-size:1.25rem;cursor:pointer;color:#b0b0b0;display:none;padding:.25rem;line-height:1}.search-clear:hover{color:#f0f0f0}.search-stats{font-size:.9rem;opacity:.9;margin-top:.75rem}.search-no-results{background:#ffffff1a;padding:1rem;border-radius:0;margin-top:1rem;display:none}.search-no-results a{color:#fff;text-decoration:underline}.sitemap-section{margin-bottom:2.5rem}.sitemap-section h2{border-bottom:2px solid var(--border-primary, #333);padding-bottom:.5rem;margin-bottom:1rem}.sitemap-list{list-style:none;padding:0;margin:0}.sitemap-item{padding:.75rem 0;border-bottom:1px solid var(--border-subtle, #1f1f1f)}.sitemap-item:last-child{border-bottom:none}.sitemap-item a{font-weight:500;color:var(--accent-amber, #c9a227);text-decoration:none}.sitemap-item a:hover{text-decoration:underline}.sitemap-item.hidden{display:none}.sitemap-description{margin:.25rem 0 0;font-size:.9rem;color:#b0b0b0}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:600px){.sitemap-toc ul{flex-direction:column;gap:.5rem}.search-box{flex-direction:column}.search-input-wrapper{width:100%}}.noscript-content{max-width:800px;margin:2rem auto;padding:2rem;background:var(--bg-elevated, #1e1e1e);border-radius:0}.noscript-content h2{color:var(--text-primary, #f0f0f0);margin-bottom:1rem}.noscript-content p{color:var(--text-secondary, #b0b0b0);margin-bottom:1.5rem}.noscript-content p:nth-of-type(2){margin-bottom:1rem}.noscript-content ul{color:var(--text-primary, #f0f0f0);line-height:2}.noscript-content ul a{color:var(--accent-amber, #fbbf24)}.seo-content{max-width:900px;margin:0 auto 2rem;padding:2rem;background:var(--bg-surface, #121212);border-radius:0}.seo-content h2{color:var(--text-primary, #f0f0f0);font-size:1.5rem;margin-bottom:1rem}.seo-content h3{color:var(--text-primary, #f0f0f0);font-size:1.2rem;margin:1.5rem 0 1rem}.seo-content p{color:var(--text-secondary, #b0b0b0);line-height:1.8;margin-bottom:1.5rem}.seo-content p a{color:var(--accent-amber, #fbbf24)}.seo-content ul{color:var(--text-secondary, #b0b0b0);line-height:2;padding-left:1.5rem}.privacy-policy{max-width:900px;margin:0 auto;background:var(--bg-surface);padding:3rem;border-radius:0;box-shadow:var(--shadow-elevated);line-height:1.7;color:var(--text-secondary);border:1px solid var(--border-subtle)}.privacy-policy h1{color:var(--text-primary);font-size:2.5rem;text-align:center;margin-bottom:1rem;border-bottom:3px solid var(--accent-green);padding-bottom:1rem;font-weight:700}.privacy-policy h2{color:var(--text-primary);font-size:1.5rem;margin:3rem 0 1.5rem;padding:.75rem 0 .5rem 1rem;border-left:5px solid var(--accent-green);background:transparent;font-weight:600}.privacy-policy h3{color:var(--text-primary);font-size:1.2rem;margin:2rem 0 1rem;font-weight:600}.privacy-policy p{margin:1rem 0;text-align:justify;font-size:1rem}.privacy-policy ul,.privacy-policy ol{margin:1rem 0 1rem 2rem}.privacy-policy li{margin:.5rem 0;line-height:1.6}.privacy-policy a{color:var(--accent-amber);text-decoration:underline;transition:color var(--transition-fast)}.privacy-policy a:hover{color:var(--text-primary)}.privacy-policy strong{color:var(--text-primary);font-weight:600}.privacy-policy .highlight{background:var(--bg-subtle);padding:2rem;border-left:6px solid var(--accent-green);border-radius:0;margin:2rem 0;box-shadow:0 4px 15px var(--shadow-green-subtle)}.privacy-policy .highlight p{margin:.5rem 0}.privacy-policy .contact-info{background:var(--bg-surface);padding:2rem;border-radius:0;margin:2rem 0;border:1px solid var(--border-primary);box-shadow:inset 0 1px 3px #0000000d}.privacy-policy .toc{background:var(--bg-surface);padding:2rem;border-radius:0;margin:2rem 0;border:1px solid var(--border-primary)}.privacy-policy .toc h3{margin-top:0;color:var(--text-primary);text-align:center;font-size:1.3rem}.privacy-policy .toc ul{margin:1rem 0 0;list-style:none;columns:2;column-gap:2rem}.privacy-policy .toc li{margin:.5rem 0;break-inside:avoid}.privacy-policy .toc a{color:var(--accent-amber);text-decoration:none;font-weight:500;transition:color var(--transition-fast);display:block;padding:.3rem .5rem;border-radius:0}.privacy-policy .toc a:hover{color:var(--text-primary);background:var(--bg-subtle)}.privacy-policy .back-link{display:inline-flex;align-items:center;gap:.5rem;margin-top:3rem;padding:1rem 2rem;background:var(--accent-green);color:var(--bg-void);text-decoration:none;font-weight:600;border-radius:0;transition:all var(--transition-fast);box-shadow:0 4px 15px var(--shadow-green-light)}.privacy-policy .back-link:hover{transform:translateY(-2px);box-shadow:0 8px 25px var(--shadow-green-medium);filter:brightness(.9)}.privacy-policy .last-updated{color:var(--text-secondary);font-style:italic;margin-bottom:2rem;text-align:center;font-size:.9rem;padding:.5rem 1rem;background:var(--bg-elevated);border-radius:0;display:inline-block;width:100%}.error-page{text-align:center;padding:var(--spacing-xl) var(--spacing-md);max-width:800px;margin:0 auto}.error-content{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-lg)}.error-image{width:100%;max-width:200px;margin:0 auto}@media(max-width:767px){.error-image{max-width:150px}}.error-penguin-image{width:100%;height:auto;object-fit:contain}.error-code{font-size:6rem;font-weight:700;color:var(--accent-amber);line-height:1;margin:var(--spacing-md) 0}@media(max-width:767px){.error-code{font-size:4rem}}.error-title{font-size:var(--font-size-2xl);color:var(--text-primary);margin-bottom:var(--spacing-md)}@media(max-width:767px){.error-title{font-size:var(--font-size-xl)}}.error-description{color:var(--text-secondary);line-height:1.8;max-width:600px}.terminal-mockup{background:var(--bg-void);border:1px solid var(--border-primary);border-radius:0;padding:var(--spacing-md);text-align:left;font-family:var(--font-mono);font-size:var(--font-size-sm);max-width:100%;overflow-x:auto;margin:var(--spacing-lg) 0}.terminal-line{margin:var(--spacing-xs) 0;white-space:nowrap}.terminal-line .prompt{color:var(--accent-green)}.terminal-line .command{color:var(--text-primary);margin-left:var(--spacing-xs)}.terminal-line .error-output{color:var(--accent-red)}.terminal-line .file-list{color:var(--terminal-file-list)}.search-box{display:flex;gap:var(--spacing-sm);max-width:500px;width:100%;margin:var(--spacing-lg) 0}@media(max-width:767px){.search-box{flex-direction:column}}.search-input{flex:1;padding:var(--spacing-sm) var(--spacing-md);background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;color:var(--text-primary);font-size:var(--font-size-base)}.search-input::placeholder{color:var(--text-muted)}.search-input:focus{outline:none;border-color:var(--accent-amber)}.search-button{padding:var(--spacing-sm) var(--spacing-lg);background:var(--btn-bg-primary);color:var(--text-primary);border:1px solid var(--border-primary);border-radius:0;cursor:pointer;font-size:var(--font-size-base);transition:var(--transition-normal)}.search-button:hover{background:var(--bg-subtle)}.suggestions{text-align:left;max-width:500px;width:100%;margin:var(--spacing-lg) 0}.suggestions h3{color:var(--text-primary);margin-bottom:var(--spacing-md)}.suggestion-list{list-style:none;padding:0}.suggestion-list li{margin:var(--spacing-sm) 0}.suggestion-list li a{color:var(--accent-amber);text-decoration:none;transition:var(--transition-normal)}.suggestion-list li a:hover{color:var(--text-primary);text-decoration:underline}.quick-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-md);width:100%;max-width:700px;margin:var(--spacing-lg) 0}.quick-link-card{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:0;padding:var(--spacing-md);text-align:left}.quick-link-card h4{color:var(--text-primary);margin-bottom:var(--spacing-xs)}.quick-link-card p{color:var(--text-secondary);font-size:var(--font-size-sm);margin-bottom:var(--spacing-sm)}.quick-link-card a{color:var(--accent-amber);text-decoration:none;font-size:var(--font-size-sm)}.quick-link-card a:hover{text-decoration:underline}.action-buttons{display:flex;gap:var(--spacing-md);justify-content:center;flex-wrap:wrap;margin-top:var(--spacing-xl)}.back-button{padding:var(--spacing-sm) var(--spacing-lg);background:transparent;color:var(--text-secondary);border:1px solid var(--border-primary);border-radius:0;cursor:pointer;transition:var(--transition-normal)}.back-button:hover{background:var(--bg-subtle);color:var(--text-primary)}.additional-info{text-align:left;max-width:500px;width:100%;margin-top:var(--spacing-2xl);padding:var(--spacing-lg);background:var(--bg-elevated);border-radius:0}.additional-info h3{color:var(--text-primary);margin-bottom:var(--spacing-sm)}.additional-info p{color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.additional-info ul{color:var(--text-secondary);padding-left:var(--spacing-lg);text-align:left;max-width:400px;margin:0 auto}.additional-info ul li{margin:var(--spacing-xs) 0}.hidden{display:none!important}.d-flex{display:flex}.mt-1{margin-top:.25rem}.mt-2{margin-top:.5rem}.mt-3,.mt-md{margin-top:1rem}.mb-1{margin-bottom:.25rem}.mb-2{margin-bottom:.5rem}.mb-3{margin-bottom:1rem}.p-1{padding:.25rem}.p-2{padding:.5rem}.p-3{padding:1rem}.slide-up{animation:slideUp var(--animation-fast) ease-out}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}*{margin:0;padding:0;box-sizing:border-box}.lesson-complete-celebration,.level-up-celebration{position:fixed;top:0;left:0;width:100%;height:100%;background:#000c;display:flex;justify-content:center;align-items:center;z-index:var(--z-modal);animation:celebrationFadeIn .3s ease-out}.celebration-content,.level-up-content{background:var(--bg-surface);border-radius:0;padding:3rem;text-align:center;box-shadow:0 20px 40px #00000080;animation:celebrationSlideIn .6s ease-out;max-width:500px;margin:2rem;border:1px solid var(--border-primary)}.celebration-image,.level-up-image{margin-bottom:2rem}.celebration-main-image,.level-up-main-image{max-width:200px;height:auto;border-radius:0;animation:celebrationImageBounce 1s ease-out infinite}.celebration-text h3,.level-up-text h3{font-size:2rem;margin-bottom:1rem;color:var(--accent-green);font-weight:700}.celebration-text p,.level-up-text p{font-size:1.1rem;line-height:1.5;color:var(--text-color)}@media(max-width:768px){.learning-start-content{grid-template-columns:1fr;gap:2rem;text-align:center}.learning-start-image{order:-1}.celebration-content,.level-up-content{padding:2rem;margin:1rem}.celebration-main-image,.level-up-main-image{max-width:150px}}ul{margin:1rem 0;padding-left:1.5rem;list-style-type:disc}ol{margin:1rem 0;padding-left:1.5rem;list-style-type:decimal}li{margin-bottom:.5rem;line-height:1.5;color:var(--text-secondary)}.lesson-list ul,.challenge-list ul,.features-grid ul,.lesson-list ol,.challenge-list ol,.features-grid ol{margin:.75rem 0;padding-left:1.25rem}.lesson-list li,.challenge-list li,.features-grid li{margin-bottom:.4rem;font-size:.9rem}@media(max-width:768px){.hamburger-menu{display:flex}.main-nav{display:none}.header{padding:1rem}.logo{font-size:1.2rem}.logo-image{height:40px}.progress-info{display:none}.article-container{padding:0}.article-main{padding:1rem}}@media(max-width:768px)and (max-width:768px){.terminal-area{order:1}}.learning-content-cards{background:var(--bg-surface);padding:3rem 2rem;margin:2rem 0;border-radius:0;box-shadow:0 4px 12px #0000004d;border:1px solid var(--border-primary)}.learning-content-cards h2{text-align:center;color:var(--text-primary);margin-bottom:2rem;font-size:2rem;font-weight:600}.category-cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;max-width:800px;margin:0 auto 3rem}.category-card{background:var(--bg-elevated);padding:2.5rem;border-radius:0;box-shadow:0 8px 25px #0003;transition:all .15s ease;text-align:center;position:relative;overflow:hidden;border:2px solid var(--border-subtle);text-decoration:none}.category-card:hover{transform:translateY(-8px);box-shadow:0 15px 40px #00000026;border-color:var(--secondary-color)}.category-icon{font-size:4rem;margin-bottom:1.5rem;display:block}.category-card h3{color:var(--text-primary);font-size:1.6rem;margin-bottom:1rem;font-weight:700}.category-card p{color:var(--text-muted);line-height:1.6;margin-bottom:1.5rem;font-size:1rem}.category-card small{color:var(--secondary-color);font-weight:600}.category-badge{position:absolute;top:1rem;right:1rem;background:var(--btn-bg-primary);color:#fff;padding:.4rem 1rem;border-radius:0;font-size:.8rem;font-weight:600}.featured-articles{margin-top:3rem}.featured-articles h3{text-align:center;color:var(--text-primary);margin-bottom:1.5rem;font-size:1.4rem;font-weight:600}.featured-cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;max-width:600px;margin:0 auto}.featured-card{background:var(--bg-elevated);padding:1.8rem;border-radius:0;box-shadow:0 4px 15px #0003;transition:all .15s ease;text-align:center;border:1px solid var(--border-subtle);text-decoration:none}.featured-card:hover{transform:translateY(-3px);box-shadow:0 8px 20px #0000001f;border-color:#0000004d}.featured-icon{font-size:2.5rem;margin-bottom:1rem;display:block}.featured-card h4{color:var(--text-primary);font-size:1.2rem;margin-bottom:.8rem;font-weight:600}.featured-card p{color:var(--text-muted);line-height:1.5;font-size:.9rem}.modal-content{background:var(--bg-surface);padding:3rem;border-radius:0;box-shadow:var(--shadow-lg);border:1px solid var(--border-primary);max-width:500px;width:90%;text-align:center;transform:scale(.9);transition:transform .15s ease}.modal-content h2{color:var(--text-primary);margin-bottom:1rem;font-size:1.8rem}.modal-content p{color:var(--text-muted);margin-bottom:2rem;line-height:1.6}.modal-buttons{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.modal-button{background:var(--btn-bg-primary);color:#fff;border:none;padding:1rem 2rem;border-radius:0;font-weight:500;cursor:pointer;transition:all .15s ease;flex:1;min-width:150px}.modal-button:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0006}.modal-button.secondary{background:var(--bg-elevated);color:var(--text-primary);border:2px solid var(--border-primary)}.modal-button.secondary:hover{background:var(--btn-bg-primary);color:var(--text-primary)}.article-recommendation{position:fixed;bottom:20px;right:20px;max-width:400px;min-width:320px;background:var(--bg-elevated);border-radius:0;box-shadow:var(--shadow-lg);border-left:4px solid var(--accent-amber);transform:translate(420px);transition:transform .15s ease;z-index:var(--z-navigation)}.article-recommendation.show{transform:translate(0)}@media(max-width:768px){.learning-content-cards{padding:2rem 1rem;margin:1rem 0}.category-cards-grid{grid-template-columns:1fr;gap:1.5rem;margin-bottom:2rem}.category-card{padding:2rem 1.5rem}.category-icon{font-size:3rem}.category-card h3{font-size:1.4rem}.featured-cards-grid{grid-template-columns:1fr;gap:1rem}.featured-card{padding:1.5rem}.featured-articles{margin-top:2rem}.modal-content{padding:2rem 1.5rem;margin:1rem}.modal-buttons{flex-direction:column}.article-recommendation{bottom:10px;right:10px;left:auto;max-width:350px;min-width:280px;transform:translateY(100px)}.article-recommendation.show{transform:translateY(0)}}.dropdown-divider{height:1px;background:#0000001a;margin:8px 0;border:none}.footer-divider{height:1px;background:var(--border-subtle);margin:8px 0;list-style:none}