:root{--color-bg:#fbfbfd;--color-surface:#fff;--color-surface-secondary:#f5f5f7;--color-text:#1d1d1f;--color-text-secondary:#6e6e73;--color-text-tertiary:#86868b;--color-accent:#0071e3;--color-accent-hover:#0077ed;--color-accent-light:#e8f0fe;--color-border:#d2d2d7;--color-border-light:#e8e8ed;--color-separator:#e8e8ed;--shadow-xs:0 1px 3px #0000000a;--shadow-sm:0 2px 8px #0000000f;--shadow-md:0 4px 16px #00000014;--shadow-lg:0 8px 32px #0000001a;--shadow-xl:0 16px 48px #0000001f;--radius-sm:8px;--radius-md:12px;--radius-lg:18px;--radius-xl:24px;--transition-fast:.2s cubic-bezier(.25, .1, .25, 1);--transition-normal:.35s cubic-bezier(.25, .1, .25, 1);--transition-slow:.5s cubic-bezier(.25, .1, .25, 1)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{background-color:var(--color-bg);color:var(--color-text);letter-spacing:-.01em;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;line-height:1.5}a{color:inherit;transition:color var(--transition-fast);text-decoration:none}.container{max-width:1200px;margin:0 auto;padding:0 22px}.site-header{z-index:1000;-webkit-backdrop-filter:saturate(180%)blur(20px);border-bottom:1px solid var(--color-border-light);background:#fbfbfdb8;position:sticky;top:0}.nav{justify-content:space-between;align-items:center;height:48px;display:flex}.logo{color:var(--color-text);align-items:center;gap:6px;font-size:18px;font-weight:600;display:flex}.logo-icon{font-size:20px}.nav-links{gap:28px;list-style:none;display:flex}.nav-links a{color:var(--color-text-secondary);transition:color var(--transition-fast);font-size:13px;font-weight:400}.nav-links a:hover{color:var(--color-text)}.nav-links a.active{color:var(--color-text);font-weight:500}.mobile-menu-btn{cursor:pointer;background:0 0;border:none;flex-direction:column;gap:4px;padding:8px;display:none}.mobile-menu-btn span{background:var(--color-text);width:18px;height:1.5px;transition:all var(--transition-fast);border-radius:2px}.hero{text-align:center;padding:100px 0 60px}.hero h1{letter-spacing:-.03em;color:var(--color-text);margin-bottom:12px;font-size:56px;font-weight:700}.hero p{color:var(--color-text-secondary);max-width:560px;margin:0 auto 40px;font-size:20px;font-weight:400}.search-box{max-width:560px;margin:0 auto;position:relative}.search-box input{background:var(--color-surface);border:1px solid var(--color-border-light);width:100%;color:var(--color-text);transition:all var(--transition-fast);box-shadow:var(--shadow-xs);border-radius:980px;outline:none;padding:14px 24px;font-size:17px}.search-box input:focus{border-color:var(--color-accent);box-shadow:0 0 0 4px #0071e31a}.search-box input::placeholder{color:var(--color-text-tertiary)}.section{padding:32px 0}.section-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.section-title{letter-spacing:-.02em;align-items:center;gap:8px;font-size:24px;font-weight:600;display:flex}.section-more{color:var(--color-accent);transition:color var(--transition-fast);font-size:14px;font-weight:400}.section-more:hover{color:var(--color-accent-hover);text-decoration:underline}.categories{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin-bottom:16px;display:grid}.category-card{background:var(--color-surface);border:1px solid var(--color-border-light);border-radius:var(--radius-lg);text-align:center;transition:all var(--transition-fast);cursor:pointer;padding:20px}.category-card:hover{box-shadow:var(--shadow-md);border-color:var(--color-border);transform:translateY(-2px)}.category-card .name{color:var(--color-text);margin-bottom:4px;font-size:17px;font-weight:600}.category-card 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8px;font-size:12px}.meta-text{color:var(--color-text-tertiary)}.video-arrow{color:var(--color-text-tertiary);transition:color var(--transition-fast);flex-shrink:0;margin-left:12px;font-size:20px;font-weight:300}.video-card:hover .video-arrow{color:var(--color-text-secondary)}.pan-links{flex-wrap:wrap;gap:6px;margin-top:10px;display:flex}.pan-link{background:var(--color-surface-secondary);color:var(--color-text-secondary);transition:all var(--transition-fast);border-radius:980px;align-items:center;gap:3px;padding:3px 8px;font-size:11px;font-weight:500;display:inline-flex}.pan-link:hover{color:var(--color-text)}.pan-link.baidu{color:#4253da;background:#eef0ff}.pan-link.aliyun{color:#c60;background:#fff0e6}.pan-link.quark{color:#1a8848;background:#e6f7ee}.pan-link.xunlei{color:#1070a8;background:#e6f4fb}.search-results{padding:32px 0}.search-stats{color:var(--color-text-tertiary);margin-bottom:20px;font-size:14px}.search-stats strong{color:var(--color-text);font-weight:600}.no-results{text-align:center;color:var(--color-text-tertiary);padding:80px 24px}.no-results h3{color:var(--color-text);margin-bottom:6px;font-size:18px;font-weight:600}.video-detail{padding:32px 0}.video-detail-header{margin-bottom:40px}.video-detail-info h1{letter-spacing:-.02em;color:var(--color-text);margin-bottom:16px;font-size:32px;font-weight:700;line-height:1.2}.video-detail-meta{flex-wrap:wrap;gap:12px;margin-bottom:24px;display:flex}.video-detail-meta-item{color:var(--color-text-tertiary);align-items:center;gap:4px;font-size:14px;display:flex}.video-detail-meta-item strong{color:var(--color-text);font-weight:500}.video-detail-description{color:var(--color-text-secondary);margin-bottom:32px;font-size:15px;line-height:1.7}.video-detail-pan-links h3{color:var(--color-text);margin-bottom:12px;font-size:16px;font-weight:600}.video-detail-pan-links .pan-link{border-radius:980px;padding:10px 18px;font-size:14px}.breadcrumb{color:var(--color-text-tertiary);padding:20px 0;font-size:13px}.breadcrumb a{color:var(--color-text-tertiary)}.breadcrumb a:hover{color:var(--color-accent)}.breadcrumb .separator{opacity:.5;margin:0 6px}.breadcrumb .current{color:var(--color-text-secondary)}.pagination{flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;margin-top:32px;display:flex}.page-btn{min-width:36px;height:36px;color:var(--color-text-secondary);background:var(--color-surface);border:1px solid var(--color-border-light);border-radius:var(--radius-sm);transition:all var(--transition-fast);cursor:pointer;justify-content:center;align-items:center;padding:0 12px;font-size:14px;font-weight:400;display:inline-flex}.page-btn:hover{background:var(--color-surface-secondary);color:var(--color-text);border-color:var(--color-border)}.page-btn.active{background:var(--color-accent);color:#fff;border-color:var(--color-accent);font-weight:500}.page-btn.page-nav{padding:0 16px}.page-ellipsis{min-width:36px;height:36px;color:var(--color-text-tertiary);letter-spacing:2px;justify-content:center;align-items:center;font-size:14px;display:inline-flex}.site-footer{border-top:1px solid var(--color-separator);text-align:center;color:var(--color-text-tertiary);margin-top:60px;padding:24px 0;font-size:12px}main{min-height:calc(100vh - 120px)}@keyframes spin{to{transform:rotate(360deg)}}.loading-spinner{border:2.5px solid var(--color-border-light);border-top-color:var(--color-accent);border-radius:50%;width:28px;height:28px;animation:.8s linear infinite spin;display:inline-block}@media (width<=768px){.hero{padding:60px 0 40px}.hero h1{font-size:36px}.hero p{font-size:17px}.nav-links{-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--color-border-light);opacity:0;pointer-events:none;transition:all var(--transition-fast);background:#fbfbfde6;flex-direction:column;gap:12px;padding:16px 22px;position:fixed;top:48px;left:0;right:0;transform:translateY(-100%)}.nav-links.active{opacity:1;pointer-events:auto;transform:translateY(0)}.mobile-menu-btn{display:flex}.video-grid{border-radius:var(--radius-md)}.categories{grid-template-columns:repeat(2,1fr)}.section-title{font-size:20px}}@media (width<=480px){.categories{grid-template-columns:1fr}.hero h1{font-size:28px}}