:root{
    --bg:#f7f5f0;
    --panel:#ffffff;
    --panel-soft:#fbfaf7;
    --ink:#16181d;
    --muted:#6c717d;
    --line:rgba(22,24,29,.11);
    --accent:#1d2433;
    --accent-soft:#ece7dd;
    --radius:28px;
    --shadow:0 24px 80px rgba(29,36,51,.09);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
    margin:0;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;
    color:var(--ink);
    background:radial-gradient(circle at top left, #fff 0, var(--bg) 34%, #f3f0ea 100%);
    line-height:1.7;
}
a{color:inherit;text-decoration:none}
img,video{max-width:100%;display:block}
.site-header{
    position:sticky;top:0;z-index:50;
    background:rgba(247,245,240,.88);
    backdrop-filter:blur(20px);
    border-bottom:1px solid var(--line);
}
.nav-wrap{
    max-width:1180px;margin:0 auto;
    display:flex;align-items:center;justify-content:space-between;
    gap:24px;padding:18px 22px 12px;
}
.brand-logo{display:inline-flex;align-items:center;gap:12px;font-weight:700;letter-spacing:.02em}
.logo-mark{
    width:48px;height:48px;border-radius:18px;
    display:grid;place-items:center;
    color:#fff;background:linear-gradient(145deg,#111827,#344054);
    box-shadow:0 16px 34px rgba(17,24,39,.18);
}
.logo-text{font-size:15px;color:var(--muted)}
.main-nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:center}
.main-nav a{padding:9px 12px;border-radius:999px;color:#3d424d;font-size:14px;transition:.25s ease}
.main-nav a:hover{background:#fff;box-shadow:0 10px 30px rgba(29,36,51,.07);transform:translateY(-1px)}
.nav-cta,.primary-btn,.secondary-btn,.join-form button{
    border:1px solid var(--accent);border-radius:999px;padding:12px 18px;
    font-weight:700;transition:.25s ease;white-space:nowrap;
}
.nav-cta,.primary-btn,.join-form button{background:var(--accent);color:#fff}
.secondary-btn{background:rgba(255,255,255,.55);color:var(--accent)}
.nav-cta:hover,.primary-btn:hover,.secondary-btn:hover,.join-form button:hover{transform:translateY(-2px);box-shadow:0 18px 44px rgba(29,36,51,.14)}
.search-bar{
    max-width:1180px;margin:0 auto;padding:0 22px 16px;
    display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;
}
.search-bar label{font-size:13px;color:var(--muted)}
.search-bar input{
    width:100%;border:1px solid var(--line);background:#fff;border-radius:999px;padding:13px 16px;
    outline:none;color:var(--ink);
}
.search-bar input:focus{border-color:rgba(29,36,51,.38);box-shadow:0 0 0 4px rgba(29,36,51,.06)}
.search-bar button{border:0;background:#fff;border-radius:999px;padding:12px 16px;cursor:pointer}
.search-note{grid-column:2 / 4;margin:0;color:var(--muted);font-size:13px;min-height:18px}
.hero,.section,.join,.stats{max-width:1180px;margin:0 auto}
.hero{
    padding:90px 22px 64px;display:grid;grid-template-columns:minmax(0,1.35fr) minmax(260px,.65fr);gap:34px;align-items:stretch;
}
.hero-copy,.hero-panel,.section,.join,.stats{position:relative}
.eyebrow{margin:0 0 14px;color:var(--muted);font-size:13px;letter-spacing:.16em;text-transform:uppercase;font-weight:700}
h1,h2,h3{line-height:1.16;margin:0;color:var(--ink);letter-spacing:-.04em}
h1{font-size:clamp(42px,7vw,86px);max-width:900px}
h2{font-size:clamp(30px,4vw,52px)}
h3{font-size:22px}
p{color:var(--muted)}
.hero-copy>p:not(.eyebrow){font-size:18px;max-width:720px;margin:26px 0 0}
.hero-actions{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.hero-panel{
    border:1px solid var(--line);background:rgba(255,255,255,.68);border-radius:var(--radius);padding:34px;
    box-shadow:var(--shadow);min-height:360px;display:flex;flex-direction:column;justify-content:end;overflow:hidden;
}
.hero-panel:before{content:"";position:absolute;inset:22px;border-radius:24px;background:linear-gradient(145deg,rgba(236,231,221,.75),rgba(255,255,255,.25));z-index:-1}
.hero-panel span{color:var(--muted)}
.hero-panel strong{font-size:96px;letter-spacing:-.08em;line-height:1;color:var(--accent)}
.section{padding:70px 22px}
.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,440px);gap:36px;align-items:end;margin-bottom:30px}
.section-head.compact{display:block;max-width:860px}
.section-head p{margin:0}.lead{font-size:20px;max-width:980px;margin:0;color:#3f4652}
.video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.video-card,.board-card,.review-card,.inner-card{
    background:rgba(255,255,255,.75);border:1px solid var(--line);border-radius:var(--radius);
    box-shadow:0 16px 60px rgba(29,36,51,.06);overflow:hidden;transition:.28s ease;
}
.video-card:hover,.board-card:hover,.review-card:hover,.inner-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.video-figure{position:relative;margin:0;aspect-ratio:16/10;background:#fff;overflow:hidden}
.video-shell{width:100%;height:100%;object-fit:cover;background:#eee}
.sr-image{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;pointer-events:none}
.video-figure figcaption{position:absolute;left:14px;right:14px;bottom:12px;color:rgba(22,24,29,.72);background:rgba(255,255,255,.72);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.52);border-radius:16px;padding:8px 10px;font-size:12px}
.play-indicator{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(.9);opacity:0;border:0;width:62px;height:62px;border-radius:50%;background:rgba(22,24,29,.86);color:#fff;cursor:pointer;transition:.25s ease}
.video-card:hover .play-indicator,.video-card.is-ready .play-indicator{opacity:1;transform:translate(-50%,-50%) scale(1)}
.video-body{padding:22px}.topic-meta{font-size:12px;color:var(--muted);margin-bottom:10px;letter-spacing:.08em}.video-body p{min-height:84px}
.tags{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.tags span{font-size:12px;border:1px solid var(--line);border-radius:999px;padding:6px 10px;background:#fff}
.metrics{display:flex;gap:12px;flex-wrap:wrap;color:#3b414d;font-size:13px;border-top:1px solid var(--line);padding-top:15px}
.board-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.board-card a{display:block;padding:26px;min-height:210px}.board-dot{display:block;width:10px;height:10px;border-radius:50%;background:var(--accent);margin-bottom:38px}.board-card p{margin-bottom:0}
.stats{padding:20px 22px 70px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.stats div{padding:28px;background:#fff;border:1px solid var(--line);border-radius:24px}.stats strong{display:block;font-size:38px;letter-spacing:-.05em}.stats span{color:var(--muted);font-size:14px}
.review-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.review-card{padding:26px}.review-card p{min-height:96px}.review-card strong{display:block}.review-card span{color:var(--muted);font-size:13px}
.faq-list{display:grid;gap:12px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:22px;padding:20px}.faq-list summary{cursor:pointer;font-weight:700}.faq-list p{margin-bottom:0}
.share-row{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.share-btn{border:1px solid var(--line);border-radius:22px;background:#fff;padding:18px;text-align:left;cursor:pointer;font-weight:700}.share-btn span{display:block;color:var(--muted);font-weight:400;font-size:13px;margin-top:8px}
.join{margin-top:40px;margin-bottom:50px;padding:42px 22px;display:grid;grid-template-columns:1fr 420px;gap:28px;align-items:center;background:rgba(255,255,255,.58);border:1px solid var(--line);border-radius:34px;box-shadow:var(--shadow)}
.join-form{display:grid;gap:12px}.join-form label{font-size:13px;color:var(--muted)}.join-form input{display:block;width:100%;margin-top:6px;border:1px solid var(--line);border-radius:18px;padding:14px;background:#fff}.join-form button{cursor:pointer;width:100%}
.inner-links{padding-top:20px}.inner-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.inner-card{padding:22px}.inner-card strong{display:block;margin-bottom:10px}.inner-card span{display:block;color:var(--muted);font-size:14px}
.page-hero{max-width:1180px;margin:0 auto;padding:76px 22px 30px}.page-hero h1{font-size:clamp(38px,6vw,72px)}.page-hero p{max-width:790px;font-size:18px}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:22px}.content-list{display:grid;gap:16px}.content-item{background:#fff;border:1px solid var(--line);border-radius:24px;padding:24px}.content-item h3{margin-bottom:8px}.policy-list{counter-reset:item;display:grid;gap:14px}.policy-list li{list-style:none;background:#fff;border:1px solid var(--line);border-radius:22px;padding:20px}.policy-list li:before{counter-increment:item;content:"0" counter(item);font-weight:800;color:var(--muted);margin-right:12px}
.site-footer{margin-top:60px;background:#111827;color:#fff;padding:54px 22px 26px}.footer-grid{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:1.4fr .8fr 1fr;gap:34px}.footer-grid p,.site-footer a,.copyright{color:rgba(255,255,255,.72)}.footer-grid a{display:block;margin:8px 0}.footer-grid h2{font-size:16px;color:#fff;letter-spacing:0}.footer-logo .logo-mark{background:#fff;color:#111827}.copyright{max-width:1180px;margin:34px auto 0;font-size:13px;border-top:1px solid rgba(255,255,255,.12);padding-top:22px}.update-time{font-weight:700;color:#fff!important}
@media (max-width:980px){.nav-wrap{align-items:flex-start;flex-direction:column}.main-nav{justify-content:flex-start}.hero,.join{grid-template-columns:1fr}.section-head{grid-template-columns:1fr}.video-grid,.board-grid,.review-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stats,.share-row,.inner-grid,.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.search-bar{grid-template-columns:1fr}.search-note{grid-column:auto}.hero{padding-top:54px}.video-grid,.board-grid,.review-grid,.stats,.share-row,.inner-grid,.footer-grid{grid-template-columns:1fr}.nav-cta{display:none}.hero-panel{min-height:260px}.hero-panel strong{font-size:72px}.section,.page-hero{padding-left:16px;padding-right:16px}.join{margin-left:16px;margin-right:16px}.video-body p{min-height:auto}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}