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3rem}.category-card{background:linear-gradient(135deg,#f8f9ff,#fff);padding:2.5rem;border-radius:16px;box-shadow:0 8px 25px #00000014;transition:all .4s ease;text-align:center;position:relative;overflow:hidden;border:2px solid #e8ecff;text-decoration:none}.category-card:hover{transform:translateY(-8px);box-shadow:0 15px 40px #667eea26;border-color:var(--secondary-color)}.category-icon{font-size:4rem;margin-bottom:1.5rem;display:block}.category-card h3{color:var(--dark-color);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(--gradient-primary);color:#fff;padding:.4rem 1rem;border-radius:20px;font-size:.8rem;font-weight:600}.featured-articles{margin-top:3rem}.featured-articles h3{text-align:center;color:var(--dark-color);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:#ffffffe6;padding:1.8rem;border-radius:12px;box-shadow:0 4px 15px #0000000f;transition:all .3s ease;text-align:center;border:1px solid rgba(102,126,234,.1);text-decoration:none}.featured-card:hover{transform:translateY(-3px);box-shadow:0 8px 20px #667eea1f;border-color:#667eea4d}.featured-icon{font-size:2.5rem;margin-bottom:1rem;display:block}.featured-card h4{color:var(--dark-color);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:#fff;padding:3rem;border-radius:16px;box-shadow:var(--shadow-lg);max-width:500px;width:90%;text-align:center;transform:scale(.9);transition:transform .3s ease}.modal-content h2{color:var(--dark-color);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(--gradient-primary);color:#fff;border:none;padding:1rem 2rem;border-radius:25px;font-weight:500;cursor:pointer;transition:all .3s ease;flex:1;min-width:150px}.modal-button:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.modal-button.secondary{background:#fff;color:var(--primary-color);border:2px solid var(--primary-color)}.modal-button.secondary:hover{background:var(--primary-color);color:#fff}.article-recommendation{position:fixed;bottom:20px;right:20px;max-width:400px;min-width:320px;background:#fff;border-radius:12px;box-shadow:var(--shadow-lg);border-left:4px solid var(--info-color);transform:translate(420px);transition:transform .3s ease;z-index:900}.article-recommendation.show{transform:translate(0)}.recommendation-content{padding:1.5rem;display:flex;align-items:center;gap:1rem}.recommendation-icon{font-size:1.5rem;flex-shrink:0}.recommendation-text{flex:1;line-height:1.5}.recommendation-text strong{color:var(--dark-color);display:block;margin-bottom:.25rem}.recommendation-text a{color:var(--primary-color);text-decoration:none;font-weight:500}.recommendation-text a:hover{text-decoration:underline}.recommendation-close{background:none;border:none;font-size:1.2rem;color:var(--text-muted);cursor:pointer;padding:.25rem;border-radius:var(--radius-full);width:30px;height:30px;display:flex;align-items:center;justify-content:center;transition:background-color .2s ease}.recommendation-close:hover{background-color:var(--light-color)}@media(max-width:768px){.learning-content-cards{padding:2rem 1rem;margin:1rem 0}.content-grid{grid-template-columns:1fr;gap:1rem}.content-card{padding:1.5rem}.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)}}.index-link{font-weight:600!important;background:#667eea1a!important;border-radius:4px!important;padding:8px 12px!important;transition:all .2s ease!important}.index-link:hover{background:#667eea33!important;transform:translate(4px)!important}.dropdown-divider{height:1px;background:#0000001a;margin:8px 0;border:none}.footer-divider{height:1px;background:#fff3;margin:8px 0;list-style:none}.linux-intro-section{padding:3rem 2rem;background:#f8f9fa}.linux-intro-section h2{text-align:center;font-size:1.8rem;margin-bottom:2rem;color:var(--text-color)}.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:#444}.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 #eee}.benefit-list li:before{content:"✓";position:absolute;left:0;color:var(--success-color);font-weight:700}.target-list li:before{content:"→";position:absolute;left:0;color:var(--secondary-color)}.learning-flow-section{padding:3rem 2rem;background:#fff}.learning-flow-section h2{text-align:center;font-size:1.8rem;margin-bottom:2rem;color:var(--text-color)}.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:#f8f9fa;border-radius:12px;border-left:4px solid var(--secondary-color)}.step-number{flex-shrink:0;width:50px;height:50px;background:var(--gradient-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-color)}.step-content p{color:#666;line-height:1.6;margin:0}.step-content code{background:#e9ecef;padding:2px 6px;border-radius:4px;font-family:monospace;font-size:.9em}.faq-excerpt-section{padding:3rem 2rem;background:#f8f9fa}.faq-excerpt-section h2{text-align:center;font-size:1.8rem;margin-bottom:2rem;color:var(--text-color)}.faq-excerpt-list{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:1rem}.faq-excerpt-item{background:#fff;padding:1.5rem;border-radius:8px;box-shadow:0 2px 4px #0000000d;border-left:3px solid var(--secondary-color)}.faq-excerpt-question{font-size:1.1rem;color:var(--text-color);margin-bottom:.8rem}.faq-excerpt-answer{color:#666;line-height:1.7;margin:0}.faq-excerpt-answer code{background:#e9ecef;padding:2px 6px;border-radius:4px;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:6px;transition:all .2s ease}.faq-more-link:hover{background:var(--secondary-color);color:#fff}@media(max-width:768px){.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:2rem auto 0;max-width:600px}.troubleshoot-link{display:flex;align-items:center;gap:1rem;padding:1rem 1.5rem;background:linear-gradient(135deg,#fff9f5,#ffefe5);border:2px solid #e67e22;border-radius:12px;text-decoration:none;transition:all .3s ease}.troubleshoot-link:hover{transform:translateY(-2px);box-shadow:0 4px 12px #e67e2240;background:linear-gradient(135deg,#fff5ed,#ffe8d9)}.banner-icon{font-size:1.8rem;flex-shrink:0}.banner-text{flex:1}.banner-text strong{display:block;color:#d35400;font-size:1rem;margin-bottom:.25rem}.banner-text small{color:#666;font-size:.85rem}.banner-arrow{font-size:1.5rem;color:#e67e22;flex-shrink:0}@media(max-width:768px){.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}}