:root{--bg:#0a0e14;--panel:#101722;--text:#eef2f6;--muted:#9aa7b4;--accent:#7fc4ff;--accent2:#52e3c2;--line:rgba(255,255,255,.1);--max:1120px;--radius:20px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(900px 420px at 15% 0%,rgba(127,196,255,.08),transparent 60%),radial-gradient(800px 380px at 90% 8%,rgba(82,227,194,.06),transparent 55%),var(--bg);color:var(--text);font:16px/1.6 Inter,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;letter-spacing:.01em}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.nav{position:sticky;top:0;z-index:10;background:rgba(10,14,20,.78);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--max);margin:0 auto;padding:12px 24px;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:750;letter-spacing:.03em}.brand img{width:34px;height:34px}.brand span{color:var(--muted);font-weight:500}
.nav-links{display:flex;gap:18px;flex-wrap:wrap;align-items:center;color:var(--muted);font-size:.95rem}.nav-links a:hover{color:var(--text)}
.lang-switch{border:1px solid var(--line);border-radius:999px;padding:4px 13px;font-size:.86rem;font-weight:650;color:var(--text)}.lang-switch:hover{border-color:var(--accent);color:var(--text)}
.hero{padding:96px 0 72px}.eyebrow,.kicker{color:var(--accent2);text-transform:uppercase;letter-spacing:.17em;font-size:.76rem;font-weight:650;margin:0 0 14px}
h1{font-size:clamp(2.4rem,6.5vw,4.4rem);line-height:1.04;margin:0 0 20px;letter-spacing:-.035em;max-width:19ch}h2{font-size:clamp(1.7rem,4vw,2.55rem);line-height:1.08;margin:0 0 16px;letter-spacing:-.03em;max-width:30ch}h3{margin:0 0 10px;font-size:1.12rem}
.sub,.lede,p{color:var(--muted);max-width:72ch}.sub{font-size:clamp(1.03rem,2vw,1.2rem);margin:0 0 30px}.lede{font-size:1.04rem;margin:0 0 26px}p{margin:0 0 16px}.lead{color:var(--text)}.hero-line{color:var(--text);font-size:clamp(1.05rem,2vw,1.22rem);font-weight:700;margin:-10px 0 30px;max-width:64ch}
section{padding:76px 0;border-top:1px solid var(--line)}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.04);font-weight:650}.btn.primary{background:linear-gradient(135deg,#7fc4ff,#a8d8ff);color:#06121f;border:0}.btn:hover{transform:translateY(-1px);border-color:rgba(127,196,255,.55)}
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.card,.cred,.panel{border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.01));padding:26px}.tag{display:inline-block;color:var(--accent);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;font-weight:650;margin-bottom:12px}
.build-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 22px;max-width:900px}.build-list li{color:var(--muted);padding-left:22px;position:relative}.build-list li:before{content:"";width:8px;height:8px;border-radius:2px;background:var(--accent2);position:absolute;left:0;top:.55em}
.principles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.principle{border:1px solid var(--line);border-radius:16px;padding:16px 18px;background:rgba(255,255,255,.02);color:var(--muted);font-size:.95rem}.principle strong{display:block;color:var(--text);margin-bottom:4px}
.about-grid,.contact-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:34px;align-items:start}.cred h3{color:var(--accent2);font-size:1rem;letter-spacing:.06em;text-transform:uppercase}.cred ul{list-style:none;margin:0 0 18px;padding:0;display:grid;gap:8px;color:var(--muted);font-size:.95rem}
.steps{list-style:none;counter-reset:step;padding:0;margin:8px 0 0;max-width:820px}.steps li{counter-increment:step;position:relative;padding:16px 0 16px 62px;border-bottom:1px solid var(--line);color:var(--muted)}.steps li:before{content:counter(step,decimal-leading-zero);position:absolute;left:0;top:14px;color:var(--accent);font-weight:750}.steps strong{color:var(--text)}
.footer{padding:30px 0 44px;color:var(--muted);font-size:.92rem;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
.demo{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--panel)}
.demo-bar{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.03);font-size:.88rem}
.demo-dot{width:9px;height:9px;border-radius:50%;background:var(--accent2);flex:none;box-shadow:0 0 0 3px rgba(82,227,194,.14)}
.demo-name{color:var(--muted);font-weight:650}
.demo-open{margin-left:auto;color:var(--accent);font-weight:650;white-space:nowrap}.demo-open:hover{text-decoration:underline}
.demo-stage{position:relative;min-height:620px;display:flex;align-items:center;justify-content:center;padding:24px;background:radial-gradient(600px 300px at 50% 0%,rgba(127,196,255,.07),transparent 70%)}
.demo-stage.live{padding:0}
.demo-stage iframe{width:100%;height:620px;border:0;display:block}
.demo-launch{display:flex;flex-direction:column;align-items:center;gap:9px;padding:28px 34px;border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,.045);color:var(--text);font:inherit;cursor:pointer;max-width:430px;text-align:center}
.demo-launch:hover{border-color:rgba(127,196,255,.55);transform:translateY(-1px)}
.demo-play{color:var(--accent2);font-size:1.45rem;line-height:1}
.demo-launch strong{font-size:1.05rem}
.demo-note{color:var(--muted);font-size:.86rem;line-height:1.5}
.demo+.demo{margin-top:20px}
.demo-foot{font-size:.9rem;margin:16px 0 0}.demo-foot a{color:var(--accent)}.demo-foot a:hover{text-decoration:underline}
@media(max-width:880px){.cards,.principles,.about-grid,.contact-grid,.build-list{grid-template-columns:1fr}.hero{padding:64px 0 52px}section{padding:58px 0}.demo-stage{min-height:460px;padding:18px}.demo-stage iframe{height:460px}}

html[lang="zh-Hans"] body {
  line-height: 1.8;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", Roboto, Helvetica, Arial, sans-serif;
}
html[lang="zh-Hans"] h1 { max-width: 23ch; font-size: clamp(2.2rem, 6vw, 4rem); line-height: 1.12; letter-spacing: -0.01em; }
html[lang="zh-Hans"] h2 { max-width: 34ch; font-size: clamp(1.6rem, 3.8vw, 2.4rem); line-height: 1.2; letter-spacing: -0.01em; }
html[lang="zh-Hans"] .sub, html[lang="zh-Hans"] .lede, html[lang="zh-Hans"] p { max-width: 74ch; }
html[lang="zh-Hans"] .hero-line { max-width: 66ch; }
html[lang="zh-Hans"] .build-list li::before { top: 0.65em; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent2); outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}