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1fr;gap:var(--spacing-xl);margin-bottom:var(--spacing-xl)}.category-sidebar{display:flex;flex-direction:column;gap:var(--spacing-lg)}.filter-section{background:#fff;padding:var(--spacing-md);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-sm)}.filter-title{font-size:1.1rem;margin-bottom:var(--spacing-sm);color:var(--text-primary);font-weight:600}.filter-options{display:flex;flex-direction:column;gap:var(--spacing-xs)}.filter-option{display:flex;align-items:center;gap:.5rem;padding:.5rem;border-radius:var(--border-radius-sm);cursor:pointer;transition:background var(--transition-fast)}.filter-option:hover{background:var(--bg-secondary)}.filter-option input[type=radio]{cursor:pointer}.filter-option span{font-size:.95rem;color:var(--text-secondary)}.filter-option input[type=radio]:checked+span{color:var(--primary-color);font-weight:500}.tag-filters{display:flex;flex-wrap:wrap;gap:.5rem}.tag-filter{background:var(--bg-secondary);color:var(--text-secondary);padding:.375rem .875rem;border-radius:var(--border-radius-md);border:2px solid transparent;font-size:.875rem;cursor:pointer;transition:all var(--transition-fast)}.tag-filter:hover{border-color:var(--primary-color);color:var(--primary-color)}.tag-filter.active{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;border-color:transparent}.clear-filters{width:100%;margin-top:var(--spacing-sm);padding:.5rem;background:var(--bg-secondary);color:var(--text-secondary);border:none;border-radius:var(--border-radius-md);font-size:.875rem;cursor:pointer;transition:all var(--transition-fast)}.clear-filters:hover{background:var(--primary-color);color:#fff}.category-main{min-height:400px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-xl);text-align:center;color:var(--text-secondary);min-height:400px}.empty-state svg{opacity:.3;margin-bottom:var(--spacing-md)}.empty-state h3{font-size:1.5rem;color:var(--text-primary);margin-bottom:var(--spacing-sm)}.empty-state p{font-size:1rem;max-width:400px}@media (max-width: 1024px){.category-content{grid-template-columns:240px 1fr;gap:var(--spacing-lg)}.videos-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}}@media (max-width: 768px){.category-hero{padding:var(--spacing-lg) 0}.category-title{font-size:2rem}.category-description{font-size:1rem}.category-content{grid-template-columns:1fr}.category-sidebar{order:2}.category-main{order:1}.filter-section{padding:var(--spacing-sm)}.videos-grid{grid-template-columns:1fr}}@media (max-width: 480px){.category-title{font-size:1.75rem}.category-description{font-size:.9rem}}.search-page{padding:var(--spacing-xl) 0;min-height:70vh;animation:fadeIn .5s ease-in-out}.search-header{margin-bottom:var(--spacing-xl);text-align:center}.search-title{font-size:2rem;color:var(--text-primary);margin-bottom:var(--spacing-sm)}.query-text{color:var(--primary-color);background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.search-results-count{font-size:1rem;color:var(--text-secondary)}.search-results-count strong{color:var(--primary-color);font-weight:600}.videos-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--spacing-lg)}.empty-state,.search-tips{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-xl);text-align:center;min-height:400px}.empty-state svg,.search-tips svg{opacity:.3;margin-bottom:var(--spacing-md);color:var(--text-secondary)}.empty-state h3,.search-tips h3{font-size:1.75rem;color:var(--text-primary);margin-bottom:var(--spacing-sm)}.empty-state p,.search-tips p{font-size:1.1rem;color:var(--text-secondary);max-width:500px;margin-bottom:var(--spacing-lg)}.suggestions,.popular-searches{margin-top:var(--spacing-lg);width:100%;max-width:600px}.suggestions h4,.popular-searches h4{font-size:1rem;color:var(--text-secondary);margin-bottom:var(--spacing-sm);text-align:left}.suggestion-tags,.popular-tags{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.suggestion-tag,.popular-tag{padding:.5rem 1rem;background:var(--bg-secondary);color:var(--text-primary);border-radius:var(--border-radius-lg);text-decoration:none;transition:all var(--transition-base);font-size:.95rem}.suggestion-tag:hover,.popular-tag:hover{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-sm)}mark{background:linear-gradient(135deg,#ff6b6b33,#4ecdc433);color:var(--primary-color);padding:0 .25rem;border-radius:2px;font-weight:500}.tips-content{display:flex;flex-direction:column;align-items:center;max-width:700px}@media (max-width: 1024px){.videos-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}}@media (max-width: 768px){.search-page{padding:var(--spacing-lg) 0}.search-title{font-size:1.75rem}.videos-grid{grid-template-columns:1fr}.empty-state,.search-tips{padding:var(--spacing-lg)}.empty-state h3,.search-tips h3{font-size:1.5rem}.empty-state p,.search-tips p{font-size:1rem}}@media (max-width: 480px){.search-title{font-size:1.5rem}.empty-state svg,.search-tips svg{width:60px;height:60px}.suggestion-tag,.popular-tag{padding:.4rem .8rem;font-size:.875rem}}.info-page{animation:fadeIn .5s ease-in-out}.info-hero{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:var(--spacing-xl) 0;text-align:center;margin-bottom:var(--spacing-xl)}.info-hero h1{font-size:2.5rem;margin-bottom:var(--spacing-sm);text-shadow:2px 4px 8px rgba(0,0,0,.2)}.info-hero p{font-size:1.2rem;opacity:.95}.info-content{max-width:900px;margin:0 auto;padding-bottom:var(--spacing-xl)}.info-section{background:#fff;padding:var(--spacing-xl);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-sm);margin-bottom:var(--spacing-xl)}.info-section h2{font-size:1.75rem;color:var(--text-primary);margin-bottom:var(--spacing-md);padding-bottom:var(--spacing-sm);border-bottom:2px solid var(--border-color);position:relative}.info-section h2:before{content:"";position:absolute;bottom:-2px;left:0;width:60px;height:2px;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color))}.info-section h3{font-size:1.25rem;color:var(--text-primary);margin-bottom:var(--spacing-sm)}.info-section p{color:var(--text-secondary);line-height:1.8;margin-bottom:var(--spacing-sm)}.section-desc{color:var(--text-secondary);font-size:1rem;margin-bottom:var(--spacing-lg);text-align:center}.mission-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--spacing-lg);margin-top:var(--spacing-lg)}.mission-card{text-align:center;padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--border-radius-md);transition:all var(--transition-base)}.mission-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}.mission-icon{font-size:3rem;margin-bottom:var(--spacing-sm)}.mission-card h3{color:var(--text-primary);margin-bottom:var(--spacing-sm)}.mission-card p{color:var(--text-secondary);font-size:.95rem;line-height:1.6}.timeline{position:relative;padding:var(--spacing-lg) 0;margin-top:var(--spacing-lg)}.timeline:before{content:"";position:absolute;left:50%;transform:translate(-50%);width:2px;height:100%;background:var(--border-color)}.timeline-item{display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-xl);margin-bottom:var(--spacing-xl);position:relative}.timeline-item:before{content:"";position:absolute;left:50%;top:0;transform:translate(-50%);width:12px;height:12px;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));border-radius:50%;border:3px solid white;box-shadow:0 0 0 2px var(--border-color);z-index:1}.timeline-item:nth-child(odd) .timeline-date{text-align:right}.timeline-item:nth-child(2n) .timeline-date{grid-column:2;text-align:left}.timeline-item:nth-child(2n) .timeline-content{grid-column:1;grid-row:1}.timeline-date{color:var(--primary-color);font-weight:600;font-size:1rem;padding:var(--spacing-sm)}.timeline-content{background:var(--bg-secondary);padding:var(--spacing-md);border-radius:var(--border-radius-md)}.timeline-content h3{color:var(--text-primary);margin-bottom:var(--spacing-xs);font-size:1.1rem}.timeline-content p{color:var(--text-secondary);font-size:.95rem;margin:0}.values-list{display:flex;flex-direction:column;gap:var(--spacing-md);margin-top:var(--spacing-lg)}.value-item{padding:var(--spacing-md);border-left:4px solid var(--primary-color);background:var(--bg-secondary);border-radius:var(--border-radius-sm)}.value-item h3{font-size:1.1rem;color:var(--text-primary);margin-bottom:var(--spacing-xs)}.value-item p{color:var(--text-secondary);font-size:.95rem;margin:0}.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--spacing-lg);margin-top:var(--spacing-lg)}.contact-grid.large{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.contact-item,.contact-card{display:flex;align-items:flex-start;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--border-radius-md);transition:all var(--transition-base)}.contact-card{flex-direction:column;align-items:center;text-align:center;padding:var(--spacing-lg)}.contact-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}.contact-icon{font-size:2rem;flex-shrink:0}.contact-icon.large{font-size:3rem;margin-bottom:var(--spacing-sm)}.contact-info h4,.contact-card h3{font-size:1.1rem;color:var(--text-primary);margin-bottom:var(--spacing-xs)}.contact-info p,.contact-card p{color:var(--text-secondary);font-size:.95rem;margin:0}.contact-card p.primary{color:var(--primary-color);font-weight:600;font-size:1rem;margin-bottom:var(--spacing-xs)}.contact-card p.secondary{color:var(--text-secondary);font-size:.9rem}.contact-info .note{font-size:.85rem;color:var(--text-light);margin-top:var(--spacing-xs)}.guide-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:var(--spacing-lg);margin-top:var(--spacing-lg)}.guide-card{padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--border-radius-md);position:relative;transition:all var(--transition-base)}.guide-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}.guide-number{position:absolute;top:-15px;left:var(--spacing-md);width:40px;height:40px;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.2rem;box-shadow:var(--shadow-sm)}.guide-card h3{margin-top:var(--spacing-md);margin-bottom:var(--spacing-sm)}.guide-card p{font-size:.95rem;line-height:1.6;margin:0}.faq-list{margin-top:var(--spacing-lg)}.faq-item{background:var(--bg-secondary);border-radius:var(--border-radius-md);margin-bottom:var(--spacing-sm);overflow:hidden;cursor:pointer;transition:all var(--transition-base)}.faq-item:hover{box-shadow:var(--shadow-sm)}.faq-question{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-md)}.faq-question h3{font-size:1rem;color:var(--text-primary);margin:0}.faq-icon{width:30px;height:30px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:var(--primary-color);flex-shrink:0}.faq-answer{padding:0 var(--spacing-md) var(--spacing-md);animation:slideDown .3s ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.faq-answer p{color:var(--text-secondary);font-size:.95rem;line-height:1.7;margin:0}.support-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:var(--spacing-md);margin-top:var(--spacing-lg)}.support-item{padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--border-radius-md)}.support-item h3{font-size:1.1rem;margin-bottom:var(--spacing-sm)}.support-item p{font-size:.9rem;margin:0}.legal-list{margin-top:var(--spacing-lg)}.legal-item{margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-lg);border-bottom:1px solid var(--border-color)}.legal-item:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.legal-item h3{color:var(--text-primary);margin-bottom:var(--spacing-sm);font-size:1.1rem}.legal-item p{color:var(--text-secondary);font-size:.95rem;line-height:1.8;margin:0}.contact-form{margin-top:var(--spacing-lg)}.form-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--spacing-md)}.form-group{margin-bottom:var(--spacing-md)}.form-group label{display:block;margin-bottom:var(--spacing-xs);color:var(--text-primary);font-weight:500;font-size:.95rem}.form-group input,.form-group textarea{width:100%;padding:.75rem 1rem;border:2px solid var(--border-color);border-radius:var(--border-radius-md);font-size:1rem;transition:all var(--transition-base);background:var(--bg-secondary)}.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--primary-color);background:#fff;box-shadow:0 0 0 3px #ff6b6b1a}.form-group input.error,.form-group textarea.error{border-color:var(--error-color)}.error-message{display:block;color:var(--error-color);font-size:.85rem;margin-top:var(--spacing-xs)}.submit-btn{width:100%;padding:1rem;font-size:1.1rem;margin-top:var(--spacing-sm)}.success-message{display:flex;flex-direction:column;align-items:center;padding:var(--spacing-xl);text-align:center}.success-message svg{color:var(--success-color);margin-bottom:var(--spacing-md)}.success-message h3{color:var(--success-color);margin-bottom:var(--spacing-sm)}.success-message p{color:var(--text-secondary);margin:0}.faq-categories{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:var(--spacing-md);margin-top:var(--spacing-lg)}.faq-category{padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--border-radius-md)}.faq-category h3{font-size:1.1rem;margin-bottom:var(--spacing-sm)}.faq-category ul{list-style:none;padding:0}.faq-category li{color:var(--text-secondary);padding:var(--spacing-xs) 0;font-size:.95rem;padding-left:var(--spacing-sm);position:relative}.faq-category li:before{content:"•";position:absolute;left:0;color:var(--primary-color)}.address-info{background:var(--bg-secondary);padding:var(--spacing-lg);border-radius:var(--border-radius-md);margin-top:var(--spacing-md)}.address-info p{margin-bottom:var(--spacing-xs);color:var(--text-secondary);font-size:.95rem}.address-info p strong{color:var(--text-primary);font-size:1.1rem}.cta-section{text-align:center;background:linear-gradient(135deg,#ff6b6b0d,#4ecdc40d)}.cta-section h2{border:none;padding-bottom:0}.cta-section h2:before{display:none}.cta-section .btn{margin-top:var(--spacing-md)}@media (max-width: 768px){.info-hero h1{font-size:2rem}.info-hero p{font-size:1rem}.info-section{padding:var(--spacing-lg)}.info-section h2{font-size:1.5rem}.timeline:before{left:20px}.timeline-item{grid-template-columns:1fr;padding-left:50px}.timeline-item:before{left:20px;transform:translate(0)}.timeline-date,.timeline-item:nth-child(odd) .timeline-date,.timeline-item:nth-child(2n) .timeline-date{text-align:left;grid-column:1}.timeline-item:nth-child(2n) .timeline-content{grid-column:1;grid-row:2}.mission-grid,.guide-grid,.contact-grid,.form-row{grid-template-columns:1fr}}@media (max-width: 480px){.info-hero h1{font-size:1.75rem}.info-section{padding:var(--spacing-md)}.contact-icon.large{font-size:2.5rem}}:root{--primary-color: #FF6B6B;--secondary-color: #4ECDC4;--accent-color: #FFE66D;--success-color: #51CF66;--warning-color: #FFA94D;--error-color: #FF6B6B;--text-primary: #2C3E50;--text-secondary: #7F8C8D;--text-light: #BDC3C7;--bg-primary: #FFFFFF;--bg-secondary: #F8F9FA;--bg-dark: #2C3E50;--border-color: #E9ECEF;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .08);--shadow-md: 0 4px 12px rgba(0, 0, 0, .12);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .16);--spacing-xs: .5rem;--spacing-sm: 1rem;--spacing-md: 1.5rem;--spacing-lg: 2rem;--spacing-xl: 3rem;--border-radius-sm: 4px;--border-radius-md: 8px;--border-radius-lg: 12px;--border-radius-xl: 16px;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;--transition-fast: .15s ease-in-out;--transition-base: .25s ease-in-out;--transition-slow: .4s ease-in-out}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-family);color:var(--text-primary);background-color:var(--bg-secondary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{line-height:1.2;font-weight:600;margin-bottom:var(--spacing-sm)}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.75rem}h4{font-size:1.5rem}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-bottom:var(--spacing-sm);line-height:1.8}a{color:var(--primary-color);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--secondary-color)}img{max-width:100%;height:auto;display:block}button{font-family:inherit;cursor:pointer;border:none;outline:none;transition:all var(--transition-base)}input,textarea,select{font-family:inherit;font-size:1rem}.container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.container-wide{max-width:1400px;margin:0 auto;padding:0 var(--spacing-md)}.app{min-height:100vh;display:flex;flex-direction:column}.main-content{flex:1;padding-top:80px}.section{padding:var(--spacing-xl) 0}.section-title{font-size:2rem;margin-bottom:var(--spacing-lg);text-align:center;position:relative;padding-bottom:var(--spacing-sm)}.section-title:after{content:"";position:absolute;bottom:0;left:50%;transform:translate(-50%);width:60px;height:3px;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color));border-radius:2px}.btn{padding:.75rem 1.5rem;border-radius:var(--border-radius-md);font-weight:500;font-size:1rem;transition:all var(--transition-base);display:inline-flex;align-items:center;gap:.5rem;cursor:pointer}.btn-primary{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;border:none}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn-secondary{background:#fff;color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{border-color:var(--primary-color);color:var(--primary-color)}.card{background:#fff;border-radius:var(--border-radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);transition:all var(--transition-base)}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px)}.loading{display:flex;justify-content:center;align-items:center;min-height:400px}.loading-spinner{width:50px;height:50px;border:4px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.fade-in{animation:fadeIn .5s ease-in-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 1024px){html{font-size:15px}.container{padding:0 var(--spacing-sm)}.section{padding:var(--spacing-lg) 0}h1{font-size:2rem}h2{font-size:1.75rem}h3{font-size:1.5rem}}@media (max-width: 768px){html{font-size:14px}.main-content{padding-top:70px}.section{padding:var(--spacing-md) 0}.section-title{font-size:1.5rem}h1{font-size:1.75rem}h2{font-size:1.5rem}h3{font-size:1.25rem}}@media (max-width: 480px){.btn{padding:.625rem 1.25rem;font-size:.9rem}}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--text-light);border-radius:5px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}