:root{
  --bg:#f7f8fb;
  --surface:#ffffff;
  --surface-soft:#f1f4f9;
  --text:#111827;
  --muted:#64748b;
  --line:#e5eaf2;
  --brand:#0f172a;
  --accent:#5f6f89;
  --accent-soft:#e7edf6;
  --radius-xl:30px;
  --radius-lg:22px;
  --shadow:0 22px 70px rgba(15,23,42,.08);
  --shadow-soft:0 14px 34px rgba(15,23,42,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(circle at 20% 0%,#eef3fb 0,#f7f8fb 34%,#fbfcfe 100%);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.72;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img,video{max-width:100%;display:block}
.container{width:min(1180px,calc(100% - 40px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(247,248,251,.82);backdrop-filter:blur(18px);border-bottom:1px solid rgba(229,234,242,.72)}
.navbar{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:18px 0}
.brand-logo{display:inline-flex;align-items:center;gap:12px;font-weight:800;letter-spacing:-.02em}
.brand-logo img{width:42px;height:42px;border-radius:12px;box-shadow:0 8px 18px rgba(15,23,42,.12)}
.brand-logo span{font-size:22px}
.nav-links{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.nav-links a{padding:10px 14px;border-radius:999px;color:#334155;font-size:15px;transition:background .2s ease,color .2s ease,transform .2s ease}
.nav-links a:hover,.nav-links a.active{background:var(--brand);color:#fff;transform:translateY(-1px)}
.search-strip{padding:0 0 18px}
.search-box{display:flex;align-items:center;gap:12px;background:rgba(255,255,255,.86);border:1px solid var(--line);border-radius:999px;padding:9px 10px 9px 18px;box-shadow:var(--shadow-soft)}
.search-box input{flex:1;border:0;outline:0;background:transparent;font-size:15px;color:var(--text);min-width:0}
.search-box button,.button{border:0;border-radius:999px;background:var(--brand);color:#fff;padding:12px 20px;font-weight:700;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s ease;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.search-box button:hover,.button:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(15,23,42,.18)}
.button.secondary{background:#fff;color:var(--brand);border:1px solid var(--line)}
.search-note{margin:10px 0 0;color:var(--muted);font-size:14px;min-height:24px}
.hero{padding:84px 0 72px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(320px,.88fr);gap:56px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:#475569;font-size:14px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 13px;box-shadow:var(--shadow-soft)}
h1,h2,h3,h4,h5,h6{letter-spacing:-.035em;line-height:1.18;color:var(--brand);margin:0}
h1{font-size:clamp(42px,7vw,82px);margin-top:24px}
h2{font-size:clamp(30px,4vw,52px)}
h3{font-size:24px}
p{margin:0;color:#475569}
.hero-copy{font-size:18px;margin:22px 0 30px;max-width:720px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-card{background:rgba(255,255,255,.78);border:1px solid rgba(229,234,242,.9);box-shadow:var(--shadow);border-radius:var(--radius-xl);padding:22px;position:relative;overflow:hidden}
.hero-card::before{content:"";position:absolute;inset:-80px -90px auto auto;width:260px;height:260px;background:radial-gradient(circle,rgba(95,111,137,.18),transparent 70%)}
.video-preview{position:relative;border-radius:24px;overflow:hidden;background:var(--surface-soft);isolation:isolate;aspect-ratio:16/10}
.video-preview img{width:100%;height:100%;object-fit:cover;transition:transform .45s ease;filter:saturate(.92)}
.video-preview:hover img{transform:scale(1.035)}
.play-button{position:absolute;inset:50% auto auto 50%;transform:translate(-50%,-50%) scale(.92);width:72px;height:72px;border-radius:50%;border:1px solid rgba(255,255,255,.64);background:rgba(15,23,42,.86);display:grid;place-items:center;opacity:0;transition:opacity .25s ease,transform .25s ease;box-shadow:0 20px 48px rgba(15,23,42,.28)}
.play-button::before{content:"";margin-left:5px;border-left:18px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent}
.video-card:hover .play-button,.video-preview:hover .play-button,.video-card:focus-within .play-button{opacity:1;transform:translate(-50%,-50%) scale(1)}
.section{padding:78px 0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:30px}
.section-head p{max-width:640px}
理念,.idea-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.idea-card,.metric,.review,.faq-card,.panel,.simple-card{background:rgba(255,255,255,.82);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow-soft)}
.idea-card strong,.metric strong{display:block;font-size:28px;color:var(--brand);letter-spacing:-.04em;margin-bottom:8px}
.video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.video-card{background:#fff;border:1px solid var(--line);border-radius:28px;overflow:hidden;box-shadow:var(--shadow-soft);transition:transform .24s ease,box-shadow .24s ease,border-color .24s ease}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:#d7dfeb}
.video-card .video-preview{border-radius:0;aspect-ratio:16/9}
.video-body{padding:20px}
.tag-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.tag{font-size:12px;color:#334155;background:var(--accent-soft);border:1px solid #dbe4f0;border-radius:999px;padding:5px 9px}
.video-body h3{font-size:20px;margin-bottom:10px}
.stat-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:16px;color:#64748b;font-size:13px}
.image-description{font-size:12px;color:#748094;margin-top:12px;border-top:1px solid var(--line);padding-top:10px}
.board-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.board-card{background:linear-gradient(180deg,#fff,rgba(255,255,255,.74));border:1px solid var(--line);border-radius:24px;padding:24px;box-shadow:var(--shadow-soft);transition:transform .2s ease,border-color .2s ease}
.board-card:hover{transform:translateY(-4px);border-color:#cbd5e1}
.board-card .icon{width:42px;height:42px;border-radius:14px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:800;margin-bottom:18px}
.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.metric strong{font-size:34px}
.reviews{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.review p{margin-top:12px}.review b{display:block;color:var(--brand)}.review small{color:var(--muted)}
.faq-list{display:grid;gap:12px}.faq-card{padding:0;overflow:hidden}.faq-card summary{cursor:pointer;padding:20px 24px;font-weight:800;color:var(--brand);list-style:none}.faq-card summary::-webkit-details-marker{display:none}.faq-card p{padding:0 24px 22px}.faq-card[open]{box-shadow:var(--shadow)}
.join-panel{display:grid;grid-template-columns:1fr .86fr;gap:24px;align-items:center;background:var(--brand);color:#fff;border-radius:34px;padding:42px;overflow:hidden;position:relative}.join-panel h2,.join-panel p{color:#fff}.join-panel::after{content:"";position:absolute;right:-80px;top:-80px;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.08)}
.join-form{display:grid;gap:12px;position:relative}.join-form input,.join-form textarea{width:100%;border:1px solid rgba(255,255,255,.22);border-radius:16px;background:rgba(255,255,255,.1);padding:13px 14px;color:#fff;outline:0}.join-form input::placeholder,.join-form textarea::placeholder{color:rgba(255,255,255,.72)}.join-form .button{background:#fff;color:var(--brand)}
.social-row{display:flex;gap:10px;flex-wrap:wrap}.social-button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 14px;color:#334155;cursor:pointer;transition:transform .2s ease}.social-button:hover{transform:translateY(-2px)}
.breadcrumb{padding-top:30px;color:#64748b;font-size:14px}.breadcrumb a{color:#0f172a;font-weight:700}
.page-hero{padding:58px 0 30px}.page-hero h1{font-size:clamp(36px,5vw,64px)}.page-hero p{max-width:820px;margin-top:18px;font-size:18px}
.content-grid{display:grid;grid-template-columns:2fr 1fr;gap:24px}.stack{display:grid;gap:18px}.simple-card h2,.simple-card h3{margin-bottom:12px}.simple-card ul{margin:14px 0 0;padding-left:20px;color:#475569}.simple-card li{margin:8px 0}.pill-list{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.rank-list{counter-reset:item;display:grid;gap:12px}.rank-item{display:flex;gap:14px;align-items:flex-start;padding:16px;border:1px solid var(--line);border-radius:18px;background:#fff}.rank-item::before{counter-increment:item;content:counter(item);width:32px;height:32px;border-radius:10px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:800;flex:0 0 32px}
.site-footer{padding:58px 0 34px;border-top:1px solid var(--line);background:rgba(255,255,255,.6)}.footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:28px}.footer-links{display:grid;gap:8px}.footer-links a{color:#475569}.footer-meta{margin-top:28px;color:#64748b;font-size:14px;display:flex;gap:12px;flex-wrap:wrap}.footer-logo{margin-bottom:14px}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(16px);opacity:0;background:var(--brand);color:#fff;border-radius:999px;padding:12px 18px;box-shadow:var(--shadow);transition:opacity .25s ease,transform .25s ease;z-index:60}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media (max-width:960px){.hero-grid,.idea-grid,.join-panel,.content-grid{grid-template-columns:1fr}.video-grid,.board-grid,.reviews{grid-template-columns:repeat(2,minmax(0,1fr))}.metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.navbar{align-items:flex-start;flex-direction:column}.nav-links{width:100%}}
@media (max-width:640px){.container{width:min(100% - 26px,1180px)}.hero{padding:54px 0}.section{padding:54px 0}.video-grid,.board-grid,.reviews,.metrics{grid-template-columns:1fr}.section-head{display:block}.section-head p{margin-top:12px}.search-box{border-radius:24px;align-items:stretch;flex-direction:column}.search-box button{width:100%}.footer-grid{grid-template-columns:1fr}.join-panel{padding:28px;border-radius:26px}.nav-links a{padding:9px 11px}.hero-actions .button{width:100%}}

.mt-14{margin-top:14px}.mt-18{margin-top:18px}.side-grid{grid-template-columns:1fr}