:root{--bg:#f5f5f7;--ink:#1d1d1f;--muted:#6e6e73;--faint:#86868b;--line:#e3e3e8;--chip:#e8e8ed;--chip-ink:#3a3a3c;--blue:#1a6bff;--blue-dark:#0f56d6;--card:#fff;--pad:clamp(16px,5vw,48px);color-scheme:light}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;font-size:17px;line-height:1.55;-webkit-font-smoothing:antialiased}
img,video{display:block;max-width:100%;height:auto}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:6px}
.wrap{width:100%;max-width:1120px;margin:0 auto;padding:0 var(--pad)}
.skip{position:absolute;left:-999px}
.skip:focus{left:16px;top:12px;z-index:20;background:#fff;padding:8px 14px;border-radius:8px}
.nav{position:sticky;top:0;z-index:10;background:rgba(245,245,247,.82);backdrop-filter:saturate(180%) blur(18px);-webkit-backdrop-filter:saturate(180%) blur(18px);border-bottom:1px solid rgba(0,0,0,.06)}
.nav .wrap{display:flex;align-items:center;gap:24px;height:56px}
.brand{display:flex;align-items:center;gap:9px;color:var(--ink);font-weight:700;font-size:18px;letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand img{width:28px;height:28px}
.nav nav{margin-left:auto}
.nav ul{display:flex;gap:24px;list-style:none;margin:0;padding:0;font-size:14px}
.nav ul a{color:var(--ink)}
.nav .lang{font-size:14px;color:var(--muted);white-space:nowrap}
.hero{text-align:center;padding:clamp(48px,8vw,88px) 0 0}
.hero img.icon{width:clamp(88px,12vw,128px);height:auto;margin:0 auto 20px;filter:drop-shadow(0 16px 28px rgba(26,107,255,.25))}
.eyebrow{color:var(--blue);font-size:15px;font-weight:600;letter-spacing:.02em;margin:0 0 8px}
h1{font-size:clamp(36px,6.4vw,68px);line-height:1.1;letter-spacing:-.025em;margin:0;font-weight:800}
h2{font-size:clamp(28px,4.4vw,46px);line-height:1.15;letter-spacing:-.02em;margin:0;font-weight:800}
h3{font-size:20px;line-height:1.3;margin:0 0 6px}
.lede{font-size:clamp(18px,2.2vw,22px);color:var(--muted);max-width:720px;margin:18px auto 0}
.cta{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin:28px 0 0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 24px;border-radius:999px;background:var(--blue);color:#fff;font-weight:600;font-size:16px}
.btn:hover{background:var(--blue-dark);text-decoration:none}
.btn.ghost{background:var(--chip);color:var(--ink)}
.btn.ghost:hover{background:#dcdce2}
.btn[aria-disabled=true]{opacity:.5;cursor:not-allowed}
.btn[aria-disabled=true]:hover{background:var(--blue)}
.btn svg{width:18px;height:18px;fill:currentColor;flex:none}
.note{color:var(--faint);font-size:14px;margin:14px 0 0}
.chips{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;list-style:none;margin:18px 0 0;padding:0}
.chips li{background:var(--chip);color:var(--chip-ink);font-size:14px;padding:5px 13px;border-radius:999px}
.film{margin:clamp(32px,6vw,56px) auto 0;max-width:1040px;border-radius:18px;overflow:hidden;background:#fff;box-shadow:0 24px 70px rgba(20,30,60,.14)}
.feature{padding:clamp(56px,9vw,104px) 0 0;text-align:center}
.feature p.desc{color:var(--muted);max-width:640px;margin:14px auto 0}
.feature picture{display:block;margin:clamp(24px,4vw,40px) auto 0}
.feature picture img{width:100%}
.band{margin-top:clamp(64px,10vw,120px);background:#fff;padding:clamp(56px,8vw,96px) 0}
.center{text-align:center}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:clamp(28px,4vw,44px) auto 0;max-width:860px;text-align:left}
.card{background:var(--bg);border-radius:20px;padding:28px}
.band.alt{background:transparent}
.band.alt .card{background:#fff;box-shadow:0 8px 30px rgba(20,30,60,.07)}
.card .price{font-size:34px;font-weight:800;letter-spacing:-.02em;margin:2px 0 12px}
.card ul{list-style:none;margin:0;padding:0}
.card li{padding:6px 0 6px 26px;position:relative;font-size:16px}
.card li:before{content:"";position:absolute;left:2px;top:13px;width:12px;height:7px;border-left:2px solid var(--blue);border-bottom:2px solid var(--blue);transform:rotate(-45deg)}
.card.dl{display:flex;flex-direction:column;align-items:flex-start;gap:6px}
.card.dl p{margin:0 0 14px;color:var(--muted);font-size:15px}
.badge{display:inline-block;background:#eaf1ff;color:var(--blue);font-size:13px;font-weight:600;padding:2px 10px;border-radius:999px;margin-bottom:8px}
.faq{max-width:760px;margin:clamp(24px,4vw,40px) auto 0;text-align:left}
.faq details{border-top:1px solid var(--line);padding:16px 0}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{font-weight:600;cursor:pointer;font-size:17px}
.faq p{margin:10px 0 0;color:var(--muted)}
.doc{max-width:760px;margin:0 auto;padding:clamp(40px,7vw,72px) 0}
.doc h1{font-size:clamp(32px,5vw,46px);margin-bottom:12px}
.doc h2{font-size:22px;letter-spacing:-.01em;margin:32px 0 8px}
.doc p,.doc li{color:#3a3a3c}
.doc ul{padding-left:22px}
.foot{border-top:1px solid var(--line);padding:32px 0 40px;color:var(--faint);font-size:14px}
.foot .wrap{display:flex;flex-wrap:wrap;gap:8px 24px;align-items:center;justify-content:space-between}
.foot ul{display:flex;flex-wrap:wrap;gap:8px 20px;list-style:none;margin:0;padding:0}
.foot a{color:var(--muted)}
@media (max-width:760px){.nav nav{display:none}.nav .lang{margin-left:auto}.grid2{grid-template-columns:minmax(0,1fr)}.card{padding:22px}.film{border-radius:12px}body{font-size:16px}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}