:root{
  --bg:#f4f3ef;--text:#111214;--muted:#6c6f74;--line:rgba(17,18,20,.12);
  --soft:rgba(17,18,20,.06);--card:rgba(255,255,255,.58);--card2:rgba(255,255,255,.78);
  --shadow:0 24px 80px rgba(17,18,20,.075);--radius:30px;--max:1180px;--accent:#176d65;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--text);background:radial-gradient(circle at 84% 0%,rgba(255,255,255,.95),transparent 29%),var(--bg);
font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}img{display:block;max-width:100%}
.shell{width:min(calc(100% - 40px),var(--max));margin:0 auto}
.nav{position:sticky;top:0;z-index:40;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);background:rgba(244,243,239,.86);border-bottom:1px solid rgba(17,18,20,.025)}
.nav-inner{height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand,.back{display:flex;align-items:center;gap:11px;font-size:14px}.back{color:var(--muted)}
.brand{font-weight:760;letter-spacing:.13em}.back:hover,.nav-links a:hover{color:var(--text)}
.back-mark{width:18px;height:18px;border-radius:50%;border:1.4px solid currentColor;display:grid;place-items:center;font-size:10px}
.nav-title{font-weight:760;letter-spacing:.15em;font-size:14px}.nav-links{display:flex;gap:28px;color:var(--muted);font-size:14px}
.hero{padding:104px 0 88px;overflow:hidden}.hero-grid{display:grid;grid-template-columns:minmax(0,.94fr) minmax(0,1.06fr);gap:72px;align-items:center}
.kicker,.section-label,.eyebrow{color:var(--muted);font-size:12px;letter-spacing:.14em;text-transform:uppercase}
h1{margin:0;font-size:clamp(72px,9vw,126px);line-height:.92;letter-spacing:-.07em;font-weight:760}
.roman{display:block;margin-top:16px;color:var(--muted);font-size:14px;letter-spacing:.2em;text-transform:uppercase;font-weight:580}
.hero-copy{max-width:650px;margin-top:42px;color:#2f3236;font-size:clamp(20px,2.1vw,30px);line-height:1.5;letter-spacing:-.025em}
.hero-note{max-width:630px;margin-top:20px;color:var(--muted);font-size:15px;line-height:1.85}
.cta-row{margin-top:32px;display:flex;flex-wrap:wrap;gap:12px}
.btn{min-height:46px;padding:0 20px;border-radius:999px;border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;gap:9px;font-size:14px;font-weight:650;background:rgba(255,255,255,.55);transition:.2s ease}
.btn:hover{transform:translateY(-1px);border-color:rgba(17,18,20,.22)}
.btn.primary{background:var(--text);color:var(--bg);border-color:var(--text)}
.btn.accent{background:var(--accent);color:white;border-color:var(--accent)}
.btn small{font-size:10px;letter-spacing:.08em;text-transform:uppercase;opacity:.7}
.hero-media{position:relative;min-height:780px;display:flex;align-items:center;justify-content:center}
.orb{position:absolute;right:36px;top:90px;width:440px;height:440px;border-radius:50%;border:1px solid var(--soft);box-shadow:0 0 0 38px rgba(17,18,20,.015),0 0 0 76px rgba(17,18,20,.01)}
.iphone{position:relative;z-index:2;width:360px;background:#111317;border-radius:58px;padding:10px;box-shadow:0 34px 100px rgba(17,18,20,.22);border:1px solid rgba(255,255,255,.1)}
.iphone:before{content:"";position:absolute;top:14px;left:50%;transform:translateX(-50%);width:124px;height:34px;border-radius:22px;background:#0b0c0f;z-index:4}
.iphone-screen{position:relative;overflow:hidden;border-radius:48px;background:#fff}.iphone-screen img{width:100%;height:auto}
.section{padding:108px 0;border-top:1px solid var(--line)}.section-grid{display:grid;grid-template-columns:.72fr 1.28fr;gap:90px;align-items:start}
.section h2{margin:0;max-width:870px;font-size:clamp(38px,5.1vw,68px);line-height:1.08;letter-spacing:-.055em;font-weight:710}
.section-lead{max-width:720px;margin:26px 0 0;color:var(--muted);font-size:17px;line-height:1.9}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:54px}
.info-card{padding:28px;border:1px solid var(--line);border-radius:26px;background:var(--card);min-height:210px}
.info-card h3{margin:0 0 14px;font-size:24px;letter-spacing:-.035em}.info-card p{margin:0;color:var(--muted);font-size:15px;line-height:1.8}
.platforms{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:44px}
.platform-card{border:1px solid var(--line);border-radius:30px;padding:32px;background:var(--card2);position:relative;overflow:hidden}
.platform-tag{font-size:11px;letter-spacing:.13em;color:var(--muted);text-transform:uppercase;margin-bottom:28px}
.platform-card h3{margin:0 0 10px;font-size:36px;letter-spacing:-.045em}.platform-card p{margin:0;color:var(--muted);line-height:1.75;font-size:15px}
.version{display:inline-flex;margin-top:20px;padding:7px 10px;border-radius:999px;background:rgba(17,18,20,.055);font-size:12px;color:#575a60}
.download-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.code{display:inline-flex;align-items:center;gap:7px;padding:10px 13px;border-radius:13px;background:#eeede8;font-size:13px}
.feature{display:grid;grid-template-columns:minmax(0,.94fr) minmax(0,1.06fr);gap:70px;align-items:center}.feature.reverse{grid-template-columns:minmax(0,1.06fr) minmax(0,.94fr)}.feature.reverse .feature-copy{order:2}
.feature-copy .index{color:var(--muted);font-size:11px;letter-spacing:.14em;margin-bottom:24px}.feature-copy h3{margin:0;font-size:clamp(38px,4.7vw,60px);line-height:1.1;letter-spacing:-.05em}
.feature-copy p{max-width:590px;margin:22px 0 0;color:var(--muted);font-size:16px;line-height:1.9}
.feature-art{border:1px solid var(--line);border-radius:32px;background:rgba(255,255,255,.5);padding:34px;display:flex;align-items:center;justify-content:center;min-height:620px}
.screen-card{width:min(100%,320px);border-radius:34px;overflow:hidden;background:white;border:1px solid rgba(17,18,20,.08);box-shadow:0 20px 70px rgba(17,18,20,.09)}
.screen-card img{width:100%;height:auto}.screen-cap{padding:16px 18px 18px;color:#575b60;font-size:13px;line-height:1.7;border-top:1px solid rgba(17,18,20,.06);background:rgba(255,255,255,.94)}
.callout{padding:28px 30px;border-radius:26px;border:1px solid rgba(23,109,101,.18);background:rgba(232,241,239,.72)}
.callout h3{margin:0 0 11px;font-size:24px}.callout p{margin:0;color:#4f5b59;line-height:1.85}
.link-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:42px}
.link-card{padding:26px 28px;border:1px solid var(--line);border-radius:24px;background:var(--card);display:flex;justify-content:space-between;gap:20px;align-items:center}
.link-card h3{margin:0 0 6px;font-size:21px}.link-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.65}.arrow{font-size:22px;color:var(--muted)}
.footer{padding:34px 0 48px;border-top:1px solid var(--line)}.footer-inner{display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:13px}
.footer-links{display:flex;gap:18px;flex-wrap:wrap}
.doc-hero{padding:90px 0 55px}.doc-hero h1{font-size:clamp(48px,7vw,86px);line-height:.98}.doc-meta{margin-top:20px;color:var(--muted);font-size:14px}
.doc-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:56px;padding-bottom:110px}
.toc{position:sticky;top:105px;align-self:start;border:1px solid var(--line);border-radius:24px;background:rgba(255,255,255,.46);padding:18px}
.toc a{display:block;padding:8px 9px;color:var(--muted);font-size:13px;line-height:1.4;border-radius:10px}.toc a:hover{background:rgba(17,18,20,.045);color:var(--text)}
.doc{max-width:860px}.doc h2{font-size:32px;letter-spacing:-.035em;margin:54px 0 16px}.doc h2:first-child{margin-top:0}.doc h3{font-size:21px;margin:30px 0 10px}
.doc p,.doc li{color:#45484d;font-size:16px;line-height:1.9}.doc ul,.doc ol{padding-left:22px}.doc hr{border:0;border-top:1px solid var(--line);margin:45px 0}
.doc blockquote{margin:22px 0;padding:18px 22px;border-left:3px solid var(--accent);background:rgba(232,241,239,.65);border-radius:0 16px 16px 0}
.doc blockquote p{margin:0}.notice{padding:20px 22px;border-radius:18px;background:rgba(255,255,255,.65);border:1px solid var(--line);margin:22px 0}.notice.warn{background:rgba(255,243,218,.66)}
.download-hero-card{border:1px solid var(--line);border-radius:32px;background:var(--card2);padding:36px;margin:20px 0 38px}.download-hero-card h2{margin:0 0 12px;font-size:40px}
.steps{counter-reset:step;display:grid;gap:14px}.step{counter-increment:step;padding:18px 20px 18px 58px;border:1px solid var(--line);border-radius:18px;position:relative;background:rgba(255,255,255,.5)}.step:before{content:counter(step);position:absolute;left:18px;top:16px;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--text);color:var(--bg);font-size:12px}
@media(max-width:1000px){.hero-grid,.section-grid,.feature,.feature.reverse{grid-template-columns:1fr}.feature.reverse .feature-copy{order:0}.hero-media{min-height:680px}.section-grid{gap:30px}.doc-layout{grid-template-columns:1fr}.toc{position:static;display:none}}
@media(max-width:760px){.shell{width:min(calc(100% - 28px),var(--max))}.nav-inner{height:66px}.nav-links{display:none}.hero{padding:72px 0 58px}.hero-media{min-height:560px}.orb{width:260px;height:260px;top:120px;right:20px}.iphone{width:260px;border-radius:44px;padding:8px}.iphone:before{width:102px;height:28px;top:12px}.iphone-screen{border-radius:36px}.section{padding:78px 0}.card-grid,.platforms,.link-grid{grid-template-columns:1fr}.feature-art{min-height:auto;padding:22px}.screen-card{width:min(100%,300px)}.footer-inner{flex-direction:column}.doc-hero{padding:64px 0 38px}.doc h2{font-size:27px}}