:root{--primary-color:#e74c3c;--primary-hover:#c0392b;--text-main:#2c3e50;--text-secondary:#7f8c8d;--bg-main:#fff;--bg-secondary:#ecf0f1;--border-color:#bdc3c7;--shadow-light:rgba(0,0,0,.08);--shadow-medium:rgba(0,0,0,.12)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg-main);color:var(--text-main);line-height:1.6;font-size:16px}.site-header{background:var(--bg-main);border-bottom:2px solid var(--primary-color);box-shadow:0 2px 8px var(--shadow-light);position:sticky;top:0;z-index:100}.header-container{max-width:1400px;margin:0 auto;padding:0 20px}.site-logo{padding:18px 0;text-align:center}.site-logo a{font-size:28px;font-weight:700;color:var(--primary-color);text-decoration:none;letter-spacing:2px}.site-nav{border-top:1px solid 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20px}.page-title{font-size:32px;font-weight:700;color:var(--text-main);margin-bottom:12px;line-height:1.3}.page-subtitle{font-size:16px;color:var(--text-secondary);margin-bottom:30px;line-height:1.8}.section{margin-bottom:50px}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:12px;border-bottom:3px solid var(--primary-color)}.section-title{font-size:24px;font-weight:700;color:var(--text-main)}.section-more{font-size:14px;color:var(--primary-color);text-decoration:none;transition:color .3s ease}.section-more:hover{color:var(--primary-hover)}.section-description{font-size:15px;color:var(--text-secondary);line-height:1.8;margin-bottom:25px}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.video-card{background:var(--bg-main);border:1px solid var(--border-color);border-radius:8px;overflow:hidden;transition:all .3s 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var(--primary-color)}.detail-text{font-size:16px;color:var(--text-secondary);line-height:1.9;text-indent:2em;margin-bottom:15px}.detail-highlight{background:var(--bg-secondary);padding:20px;border-radius:8px;border-left:4px solid var(--primary-color);font-size:16px;line-height:1.8;color:var(--text-main)}.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}.related-card{background:var(--bg-secondary);border-radius:8px;padding:15px;border:1px solid var(--border-color);transition:all .3s ease}.related-card:hover{background:var(--bg-main);border-color:var(--primary-color);box-shadow:0 4px 12px var(--shadow-light)}.related-card a{text-decoration:none;color:inherit}.related-title{font-size:16px;font-weight:600;color:var(--text-main);margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}.related-desc{font-size:13px;color:var(--text-secondary);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.site-intro{background:linear-gradient(135deg,#fff 0%,#f8f9fa 100%);border:2px solid var(--primary-color);border-radius:12px;padding:30px;margin-bottom:40px;box-shadow:0 4px 15px var(--shadow-light)}.site-intro-title{font-size:26px;font-weight:700;color:var(--primary-color);margin-bottom:18px;text-align:center}.site-intro-text{font-size:15px;color:var(--text-secondary);line-height:1.9;text-align:justify;margin-bottom:12px}.link-list{list-style:none;padding:15px 0}.link-list li{margin-bottom:10px}.link-list a{color:var(--primary-color);text-decoration:none;font-size:15px;font-weight:500;display:inline-flex;align-items:center;gap:6px;transition:color .3s ease}.link-list a:hover{color:var(--primary-hover);text-decoration:underline}.link-list a::before{content:"▸";font-size:18px}.site-footer{background:var(--text-main);color:#ecf0f1;padding:30px 20px;margin-top:60px;text-align:center}.footer-container{max-width:1400px;margin:0 auto}.footer-text{font-size:14px;line-height:1.8;color:#bdc3c7}.notice-box{background:#fff3cd;border:2px solid #ffc107;border-radius:8px;padding:30px;text-align:center;margin:50px auto;max-width:600px}.notice-title{font-size:24px;color:#856404;margin-bottom:15px}.notice-text{font-size:16px;color:#856404;line-height:1.8;margin-bottom:20px}.notice-links{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}.btn{display:inline-block;padding:12px 30px;background:var(--primary-color);color:#fff;text-decoration:none;border-radius:6px;font-weight:600;transition:all .3s 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ease;z-index:99}.back-to-top:hover{background:var(--primary-hover);transform:translateY(-4px)}.back-to-top.show{display:flex}