:root{--primary:#2A6CF0;--secondary:#bc52ee;--text-primary:#111827;--text-secondary:#4b5563;--background:#ffffff;--background-secondary:#f9fafb;--border:#e5e7eb;--radius:12px;--radius-sm:8px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--text-primary);background:var(--background-secondary);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}.container{width:min(1180px,calc(100% - 48px));margin:0 auto}
.site-header{height:74px;background:var(--background);border-bottom:1px solid var(--border);position:relative;z-index:2}.nav-wrap,.footer-wrap{height:100%;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;flex-shrink:0}.brand-logo{display:block;width:124px;height:auto;max-height:44px;object-fit:contain}nav{display:flex;align-items:center;gap:34px;color:var(--text-secondary);font-size:14px}nav a:hover{color:var(--primary)}.nav-link{color:var(--primary)}
.hero{min-height:492px;background:var(--background);overflow:hidden;position:relative;color:var(--text-primary)}.hero-backdrop{position:absolute;inset:0;background:var(--background-secondary)}.hero-grid{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;min-height:492px}.eyebrow{font-size:11px;letter-spacing:.16em;color:var(--secondary);font-weight:700;margin:0 0 18px;display:flex;align-items:center;gap:9px}.eyebrow span{display:inline-block;width:24px;height:2px;background:var(--secondary)}h1{font-size:clamp(44px,5.5vw,70px);line-height:1.13;letter-spacing:.02em;margin:0 0 22px;font-weight:750}h1 em{font-style:normal;color:var(--secondary)}.hero-text{color:var(--text-secondary);line-height:1.9;max-width:420px;font-size:16px;margin:0 0 30px}.primary-button{display:inline-flex;align-items:center;gap:18px;padding:13px 19px;background:var(--primary);color:#fff;border-radius:var(--radius-sm);font-size:14px;font-weight:700;box-shadow:0 8px 18px rgba(42,108,240,.18);transition:transform .2s,background .2s}.primary-button:hover{background:#1f5dd4;transform:translateY(-2px)}.primary-button span{font-size:18px;line-height:1}.hero-cover{position:relative;width:min(560px,100%);justify-self:end}.hero-cover img{width:100%;display:block;box-shadow:0 18px 36px rgba(17,24,39,.16);border:1px solid var(--border);border-radius:var(--radius)}.cover-badge{position:absolute;right:-18px;bottom:-18px;background:var(--background);color:var(--text-primary);padding:14px 18px;display:flex;align-items:baseline;gap:8px;box-shadow:0 10px 24px rgba(17,24,39,.14);border:1px solid var(--border);border-radius:var(--radius)}.cover-badge b{font-size:30px;color:var(--primary)}.cover-badge span{font-size:12px;color:var(--text-secondary)}
.catalog-section{padding:72px 0 86px}.section-heading{display:flex;align-items:end;justify-content:space-between;margin-bottom:28px}.section-heading h2,.about-section h2{font-size:34px;margin:0;letter-spacing:.02em}.section-note{color:var(--text-secondary);font-size:13px;line-height:1.8;text-align:right;margin:0}.catalog-layout{display:grid;grid-template-columns:190px 1fr;gap:26px;align-items:start}.directory{position:sticky;top:22px;background:var(--background);border:1px solid var(--border);padding:18px 12px;border-radius:var(--radius)}.directory-title{display:flex;justify-content:space-between;align-items:center;padding:0 8px 14px;border-bottom:1px solid var(--border);font-size:14px;font-weight:700}.directory-title span{font-size:11px;color:var(--primary);letter-spacing:.1em}.directory-item{width:100%;display:flex;justify-content:space-between;align-items:center;border:0;background:transparent;color:var(--text-secondary);padding:11px 8px;text-align:left;font:inherit;font-size:13px;cursor:pointer;transition:color .2s,background .2s}.directory-item b{font-size:11px;font-weight:500;color:#9ca3af}.directory-item:hover{color:var(--primary);background:var(--background-secondary)}.directory-item.active{color:var(--primary);font-weight:700;background:#eef4ff;border-left:2px solid var(--primary);padding-left:6px}.directory-item.active b{color:var(--primary)}.catalog-toolbar{display:flex;align-items:center;gap:18px;padding:16px;background:var(--background);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:24px}.search-box{height:42px;display:flex;align-items:center;gap:9px;flex:1;border:1px solid var(--border);padding:0 13px;color:var(--primary);border-radius:var(--radius-sm)}.search-box input{border:0;outline:0;width:100%;font:inherit;color:var(--text-primary);background:transparent}.search-box input::placeholder{color:#9ca3af}.result-count{margin:0 0 0 auto;color:var(--text-secondary);font-size:12px;white-space:nowrap}.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.video-card{background:var(--background);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:transform .2s,box-shadow .2s,border-color .2s;overflow:hidden}.video-card:hover,.video-card:focus-within{transform:translateY(-4px);border-color:#a9c2f7;box-shadow:0 13px 26px rgba(42,108,240,.1)}.thumb{aspect-ratio:16/9;background:#eef2f7;position:relative;overflow:hidden}.thumb img{width:100%;height:100%;object-fit:cover;display:block}.play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:42px;height:42px;border-radius:50%;background:var(--primary);color:#fff;display:grid;place-items:center;font-size:17px;padding-left:2px;opacity:0;transition:opacity .2s}.video-card:hover .play,.video-card:focus-within .play{opacity:1}.card-body{padding:15px 16px 16px}.card-category{font-size:11px;color:var(--primary);letter-spacing:.08em}.card-title{font-size:16px;margin:7px 0 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-meta{display:flex;justify-content:space-between;color:#9ca3af;font-size:11px;margin-top:13px}.empty-state{text-align:center;padding:62px 0;color:var(--text-secondary)}.empty-state strong,.empty-state span{display:block}.empty-state span{font-size:13px;margin-top:8px}
.about-section{background:#eef4ff;padding:60px 0}.about-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:80px;align-items:start}.about-section h2{line-height:1.45}.steps{display:grid;gap:22px}.steps>div{display:flex;gap:18px;align-items:flex-start;padding-bottom:20px;border-bottom:1px solid #d7e2f7}.steps b{font-size:13px;color:var(--secondary);letter-spacing:.1em}.steps span{font-size:14px;color:var(--text-secondary);line-height:1.7}.steps strong{display:block;color:var(--text-primary);font-size:15px;margin-bottom:3px}.site-footer{height:78px;background:var(--text-primary);color:#d1d5db;font-size:12px}.player-dialog{width:min(920px,calc(100% - 32px));padding:0;border:0;background:var(--text-primary);color:#fff;box-shadow:0 25px 80px rgba(17,24,39,.35);border-radius:var(--radius)}.player-dialog::backdrop{background:rgba(17,24,39,.58)}.dialog-head{display:flex;justify-content:space-between;align-items:center;padding:18px 22px}.dialog-head h2{font-size:19px;margin:5px 0 0}.dialog-category{color:#d79af5;font-size:11px;letter-spacing:.08em}.icon-button{border:0;background:transparent;color:#fff;font-size:28px;line-height:1;cursor:pointer;padding:0 3px}.player-dialog video{width:100%;display:block;background:#000;max-height:70vh}.dialog-actions{padding:15px 22px 20px}.dialog-actions .primary-button{padding:10px 16px;font-size:13px}
@media(max-width:900px){.video-grid{grid-template-columns:repeat(2,1fr)}.hero-grid{gap:24px}.about-grid{gap:40px}}@media(max-width:680px){.container{width:min(100% - 30px,1180px)}.site-header{height:auto;padding:14px 0}.nav-wrap{gap:12px}nav{gap:12px;font-size:12px}nav a:first-child{display:none}.hero-grid{grid-template-columns:1fr;padding:54px 0 70px}.hero-cover{width:92%;justify-self:start;margin-top:16px}.hero{min-height:0}.hero-grid{min-height:0}.catalog-section{padding:50px 0 60px}.section-heading{align-items:start;gap:15px}.section-heading h2,.about-section h2{font-size:27px}.section-note{font-size:11px}.catalog-layout{display:block}.directory{position:static;display:flex;align-items:center;gap:8px;overflow:auto;padding:12px;margin-bottom:16px}.directory-title{flex:0 0 auto;border:0;border-right:1px solid var(--border);padding:0 13px 0 3px;font-size:12px;border-radius:var(--radius-sm)}.directory-title span{display:none}.directory-item{flex:0 0 auto;width:auto;gap:11px;white-space:nowrap;padding:9px 11px}.directory-item.active{border-left:0;padding-left:11px}.catalog-toolbar{flex-wrap:wrap}.search-box{flex-basis:100%}.result-count{margin-left:0}.video-grid{grid-template-columns:repeat(2,1fr);gap:12px}.card-body{padding:11px 12px 13px}.card-title{font-size:14px}.about-grid{grid-template-columns:1fr;gap:32px}.site-footer{height:auto;padding:22px 0}.footer-wrap{align-items:flex-start;gap:8px;flex-direction:column}}@media(max-width:390px){.video-grid{grid-template-columns:1fr}}

.site-footer{height:auto;background:var(--background);color:var(--text-secondary);font-size:14px;padding:58px 0 28px;border-top:1px solid var(--border)}.official-footer{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr 2.1fr;gap:34px;align-items:start}.footer-brand img{width:156px;height:auto;display:block;margin:0 0 26px}.footer-brand strong{display:block;color:var(--text-primary);font-size:17px}.footer-column,.footer-contact{display:flex;flex-direction:column;gap:16px}.footer-column h3,.footer-contact h3{font-size:17px;color:var(--text-primary);margin:0 0 8px}.footer-column a{color:var(--text-secondary)}.footer-column a:hover{color:var(--primary)}.footer-contact p{margin:0;line-height:1.6}.qr-list{display:flex;gap:18px;margin-top:22px}.qr-list a{display:flex;flex-direction:column;align-items:center;gap:10px;color:var(--text-secondary);font-size:13px}.qr-list img{width:112px;height:112px;object-fit:cover;background:var(--background);border-radius:var(--radius);box-shadow:0 8px 22px rgba(17,24,39,.08)}.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid var(--border);margin-top:58px;padding-top:28px;color:#9ca3af;font-size:13px}@media(max-width:900px){.official-footer{grid-template-columns:repeat(3,1fr)}.footer-brand{grid-column:1/-1}.footer-contact{grid-column:1/-1}.footer-bottom{gap:12px;flex-wrap:wrap}}@media(max-width:680px){.official-footer{grid-template-columns:repeat(2,1fr);gap:30px 22px}.footer-brand{grid-column:1/-1}.footer-contact{grid-column:1/-1}.qr-list{gap:12px}.qr-list img{width:88px;height:88px}.footer-bottom{margin-top:38px;padding-top:20px;flex-direction:column;font-size:11px}}
.player-dialog{position:relative;overflow:hidden}.player-dialog .dialog-head{position:absolute;z-index:2;top:0;left:0;right:0;background:linear-gradient(180deg,rgba(17,24,39,.86),rgba(17,24,39,0));padding:15px 20px 42px}.player-dialog video{width:100%;height:auto;aspect-ratio:2560/1230;background:#000;max-height:70vh}