:root{--primary:#5B4BDB;--primary-soft:#8B7CF6;--ink:#1E1B2E;--text:#292734;--muted:#6F6B7A;--bg:#F7F7FB;--bg-soft:#EFEFFC;--accent:#F05A7E;--line:#ddddef;--white:#fff;--radius:22px;--shadow:0 16px 40px rgba(30,27,46,.08);--shell:min(1180px,calc(100% - 40px))}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.75}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}a:hover{color:var(--primary)}button,input{font:inherit}.shell{width:var(--shell);margin-inline:auto}.skip-link{position:fixed;left:16px;top:12px;z-index:1000;padding:10px 14px;background:var(--ink);color:#fff;border-radius:10px;transform:translateY(-160%)}.skip-link:focus{transform:none}.site-header{position:sticky;top:0;z-index:50;background:rgba(247,247,251,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(221,221,239,.8)}.header-grid{min-height:76px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:12px;margin-right:auto}.brand-mark{font-weight:900;letter-spacing:-.04em;font-size:1.55rem;color:var(--primary)}.brand-text{font-size:.92rem;color:var(--muted)}.site-nav{display:flex;align-items:center;gap:6px}.site-nav a{padding:9px 13px;border-radius:999px;color:var(--muted);font-size:.95rem}.site-nav a[aria-current=page],.site-nav a:hover{background:var(--bg-soft);color:var(--primary)}.nav-toggle{display:none;border:1px solid var(--line);background:#fff;padding:8px 12px;border-radius:12px}.site-main{min-height:64vh}.home-intro{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(320px,.8fr);gap:56px;align-items:center;padding-top:68px;padding-bottom:70px}.home-intro h1,.page-hero h1,.video-index-head h1,.detail h1{font-size:clamp(2.15rem,5vw,4.55rem);line-height:1.08;letter-spacing:-.055em;margin:.15em 0 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1fr;gap:18px}.content-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.content-grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}.content-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 8px 26px rgba(30,27,46,.045)}.content-card__media{display:block;overflow:hidden}.content-card__media img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .28s ease}.content-card:hover .content-card__media img{transform:scale(1.025)}.content-card__body{padding:22px}.content-card h3{font-size:1.18rem;line-height:1.28;margin:4px 0 10px;color:var(--ink)}.content-card p{font-size:.95rem;color:var(--muted);margin:0}.content-card--compact .content-card__media img{aspect-ratio:3/2}.content-card--compact .content-card__body{padding:18px}.tag-row{display:flex;flex-wrap:wrap;gap:7px;margin-top:16px}.tag{display:inline-flex;padding:5px 9px;border-radius:999px;background:var(--bg-soft);color:#5c5581;font-size:.76rem}.split-callout{display:grid;grid-template-columns:.82fr 1.18fr;gap:44px;align-items:start}.mini-stack{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.site-footer{background:var(--ink);color:#dedbea;padding:54px 0 24px}.footer-grid{display:grid;grid-template-columns:1fr auto;gap:40px}.footer-grid p{max-width:560px;color:#a9a5b7}.footer-grid nav{display:grid;gap:8px}.footer-grid a{color:#f2f0f8}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:30px;padding-top:20px;color:#9c98ab;font-size:.88rem}.page-hero{padding-top:54px;padding-bottom:58px;display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,.62fr);gap:46px;align-items:center}.page-hero--textual{display:block;max-width:1100px}.page-hero__image{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:30px}.page-hero--app .page-hero__image{aspect-ratio:4/5}.breadcrumb 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1fr;gap:48px}.video-index-head{padding-top:54px}.video-index-head__grid{display:grid;grid-template-columns:1fr 340px;align-items:end;gap:38px}.video-index-head img{border-radius:26px;aspect-ratio:4/3;object-fit:cover}.filter-bar{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:26px;padding:14px 16px;border:1px solid var(--line);background:#fff;border-radius:16px}.filter-buttons{display:flex;flex-wrap:wrap;gap:8px}.filter-btn{border:1px solid var(--line);background:#fff;color:var(--muted);padding:7px 11px;border-radius:999px;cursor:pointer}.filter-btn.is-active,.filter-btn:hover{border-color:var(--primary-soft);background:var(--bg-soft);color:var(--primary)}.noscript-note{padding:12px;background:#fff6da;border-radius:12px}.security-panel{display:grid;grid-template-columns:1fr 300px;gap:44px;align-items:center}.security-panel img{border-radius:24px;aspect-ratio:4/3;object-fit:cover}.detail{padding-top:44px;padding-bottom:78px}.detail-head{display:grid;grid-template-columns:1fr 420px;gap:48px;align-items:center}.detail-head img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:28px}.detail-body{max-width:820px;margin:54px auto 0;font-size:1.06rem}.detail-body h2{margin-top:2em;color:var(--ink)}.not-found{text-align:center;padding-top:100px;padding-bottom:120px}.status-code{font-size:clamp(5rem,15vw,11rem);font-weight:900;line-height:1;color:var(--primary);letter-spacing:-.08em}.not-found h1{font-size:2rem;color:var(--ink)}.not-found .action-row{justify-content:center}@media 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