/* Kefuro — 版式数值对标 typesafe.ai 实测(见 site/research/typesafe.json),
   字体换成可免费使用的近似款,强调色换成 Kefuro 自己的琥珀色。 */
:root{
  --bg:#fefefe; --ink:#1e1e1e; --ink-86:rgba(30,30,30,.86); --grey:#dedede; --line:rgba(0,0,0,.1);
  --amber:#ffb547; --amber-deep:#f08a24; --sky:#dcecff;
  --display:"Inter Tight","Helvetica Neue",Arial,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
  --term:"VT323","JetBrains Mono",monospace;
  --gutter:100px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--display);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
h1,h2,h3{font-weight:500;margin:0}

/* 导航:对标实测 18px / 500 / 字距 0.54px(0.03em) */
.nav{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:flex-start;pointer-events:none}
.nav .mid,.nav .right{display:flex;gap:6px}
.pill{pointer-events:auto;display:inline-block;background:#fff;padding:7px 7px 9px;font-size:18px;font-weight:500;letter-spacing:.03em;line-height:18px;text-decoration:none;color:var(--ink)}
.pill.dark{background:var(--ink);color:#fff}
.pill.brand{font-weight:600}

/* 首屏 */
.hero{position:relative;text-align:center;padding:120px 16px 90px;margin-top:-34px;overflow:hidden}
.sky{position:absolute;inset:0 0 auto 0;height:520px;z-index:-1;
  background:
    radial-gradient(60% 75% at -2% 18%,var(--amber) 0,rgba(255,181,71,.85) 38%,rgba(255,181,71,.35) 62%,transparent 78%),
    radial-gradient(52% 70% at 104% 8%,#ffc56b 0,rgba(255,197,107,.85) 36%,rgba(255,197,107,.3) 62%,transparent 78%),
    radial-gradient(30% 40% at 96% 62%,rgba(240,138,36,.7),transparent 70%),
    radial-gradient(26% 34% at 6% 70%,rgba(240,138,36,.55),transparent 70%),
    linear-gradient(var(--sky),var(--sky) 55%,var(--bg));
  -webkit-mask:linear-gradient(#000 72%,transparent);mask:linear-gradient(#000 72%,transparent)}
.sky::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.55) .9px,transparent 1px),radial-gradient(rgba(30,30,30,.16) .7px,transparent .8px);background-size:5px 5px,3px 3px;background-position:0 0,1px 2px;mix-blend-mode:normal}
.window{background:#e4e4e4;border:1px solid var(--ink);box-shadow:inset 0 0 0 2px #fff,0 0 0 1px var(--ink);font-family:var(--term);color:var(--ink);text-align:left}
.window .bar{background:var(--ink);color:#e8e8e8;font-size:18px;padding:0 6px;line-height:22px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.window .body{padding:8px 10px;font-size:19px;line-height:1.1}
.news{width:min(400px,100%);margin:20px auto 0}
.news .body{text-align:center}
.marks{position:relative;height:0;margin:60px var(--gutter) 0}
.marks i{position:absolute;top:0;left:0;width:10px;height:10px;border:1px solid var(--ink);border-width:1px 0 0 1px}
.marks i:last-child{left:auto;right:0;transform:scaleX(-1)}
.kicker{font-size:17px;font-weight:500;letter-spacing:-.01em;margin:40px 0 44px}
.kicker .dots{display:inline-block;width:90px;border-bottom:2px dotted var(--ink);vertical-align:middle}
/* H1 对标实测 150px / 行高 120px(0.8)/ 500;Inter Tight 比 Die Grotesk 宽,字距收紧 -0.045em 补齐 */
.hero .marks{margin-top:50px}
.hero h1{font-size:clamp(46px,10.4vw,150px);line-height:.8;letter-spacing:-.045em;max-width:1120px;margin:0 auto}
.bigcta{display:inline-block;margin-top:60px;font-size:clamp(34px,4.4vw,64px);font-weight:500;letter-spacing:-.045em;line-height:.9;text-decoration:none;border-bottom:4px solid var(--ink);padding-bottom:6px}
.vert{position:absolute;left:112px;top:470px;writing-mode:vertical-rl;transform:rotate(180deg);font:11px var(--mono);letter-spacing:.06em;opacity:.8;margin:0}

/* 琥珀色主叙事段 */
.amber{background:var(--amber);padding:34px var(--gutter) 120px;position:relative}
.desk{position:relative;height:780px;border:1px dotted rgba(30,30,30,.5);
  background-image:radial-gradient(rgba(30,30,30,.35) 1px,transparent 1.2px),radial-gradient(circle at 80% 45%,rgba(30,30,30,.45) 0,transparent 26%),radial-gradient(circle at 18% 85%,rgba(30,30,30,.4) 0,transparent 24%);
  background-size:6px 6px,100% 100%,100% 100%}
.desk .tag{position:absolute;left:0;top:0;background:var(--ink);color:var(--amber);font:18px var(--term);padding:0 6px}
.desk .window{position:absolute}
.desk .inv{background:var(--ink);color:#e8e8e8;font-size:34px;font-weight:400;padding:0 4px;display:inline-block;margin-bottom:6px}
.chip{display:inline-block;background:#cfcfcf;margin:6px 6px 0 0;padding:0 4px}
.w1{left:11%;top:110px;width:190px}.w2{left:25%;top:160px;width:200px}.w3{left:40%;top:60px;width:270px}
.table{left:26%;top:250px;width:min(620px,60%)}
.table .row{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1.3fr) 90px;gap:12px;align-items:center;padding:10px 0;border-bottom:1px solid #999}
.table .row span:last-child{text-align:right}
.table .inv{font-size:19px;margin:0;padding:1px 5px}
.track{position:relative;height:2px;background:#999}.track i{position:absolute;top:-6px;width:10px;height:10px;background:var(--ink)}
.table .note{font-size:16px;margin:10px 0 0;opacity:.8}
.clock{right:10px;top:40px;width:230px}
.ver{left:10px;bottom:14px;width:280px}
.huge{font-size:clamp(44px,9.6vw,150px);line-height:.8;letter-spacing:-.045em;text-align:center;color:#3a2a1c;margin:80px auto 0;max-width:1200px}
.cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px;margin-top:90px}
.cols>div{border-left:1px solid var(--ink);padding-left:10px}
.label{font:500 11px var(--mono);letter-spacing:.02em;margin:0 0 40px}
.cols p:not(.label){font-size:24px;line-height:1.1;letter-spacing:-.01em;margin:0}
/* 大数字段:对标实测 H2 64px / 0.9 */
.stat{font-size:clamp(40px,6.6vw,96px);line-height:.9;letter-spacing:-.045em;margin-top:120px;color:#3a2a1c}
.label.foot{margin:16px 0 0;max-width:560px}

/* 浅色段 */
.plain{padding:120px var(--gutter)}
h2.mid{font-size:clamp(36px,4.4vw,64px);line-height:.9;letter-spacing:-.04em;color:var(--ink-86);margin-bottom:60px}
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;border-top:1px solid var(--ink)}
.steps li{padding:18px 20px 30px 0;border-right:1px solid var(--line)}
.steps li+li{padding-left:20px}
.steps .n{font:500 12px var(--mono)}
.steps h3{font-size:28px;letter-spacing:-.03em;line-height:1;margin:40px 0 14px}
.steps p,.models p{font-size:18px;line-height:1.3;margin:0;color:var(--ink-86)}
.models{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.models article{border:1px solid var(--ink);padding:18px;min-height:280px;background:#fff}
.models h3{font-size:40px;letter-spacing:-.045em;line-height:.9;margin:50px 0 16px}
.status{font:500 12px var(--mono);background:var(--amber);padding:3px 6px}
.status.soon{background:var(--grey)}
.langs{margin-top:40px;font-size:20px}.langs .label{margin:0 12px 0 0}

/* FAQ 暗色段 */
.faq{background:var(--ink);color:#f2f2f2;padding:120px var(--gutter)}
.faq h2.mid{color:#f2f2f2}
.faq details{border-top:1px solid rgba(255,255,255,.25);max-width:900px}
.faq summary{cursor:pointer;list-style:none;font:500 15px var(--mono);padding:18px 0;display:flex;justify-content:space-between}
.faq summary::after{content:"+";font-size:20px}
.faq details[open] summary::after{content:"−"}
.faq summary::-webkit-details-marker{display:none}
.faq details p{font-size:20px;line-height:1.3;margin:0 0 22px;max-width:760px}

.foot-big{padding:100px var(--gutter) 30px;text-align:center}
.wordmark{font-size:clamp(80px,17vw,260px);font-weight:600;letter-spacing:-.06em;line-height:.8;margin:0}
.foot-big .links{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 28px;margin-top:50px;font:12px var(--mono)}

@media (max-width:900px){
  :root{--gutter:16px}
  .nav .mid{display:none}
  .pill{font-size:15px}
  .hero{padding-top:90px}
  .vert{display:none}
  .desk{height:auto;padding:40px 10px 10px;display:grid;gap:12px}
  .desk .window{position:static;width:auto}
  .table .row{grid-template-columns:1fr auto;}
  .table .track{display:none}
  .cols,.steps,.models{grid-template-columns:1fr}
  .steps li,.steps li+li{padding:18px 0 24px;border-right:0;border-bottom:1px solid var(--line)}
  .cols{gap:28px;margin-top:50px}
  .label{margin-bottom:12px}
  .plain,.faq{padding-top:80px;padding-bottom:80px}
}

/* 中文:0.8 行高会让汉字互相压住,CJK 单独放宽,取消负字距 */
:lang(zh-CN) .hero h1,:lang(zh-CN) .huge{line-height:1.02;letter-spacing:-.02em}
:lang(zh-CN) .stat,:lang(zh-CN) .bigcta,:lang(zh-CN) h2.mid,:lang(zh-CN) .models h3,:lang(zh-CN) .steps h3{line-height:1.1;letter-spacing:-.01em}
:lang(zh-CN) .cols p:not(.label){line-height:1.35;font-size:22px}

/* 内测报名表单 */
.ea{padding:110px var(--gutter)}
.ea h2.mid{color:#3a2a1c;margin-bottom:20px}
.ea-lead{font-size:22px;line-height:1.25;max-width:720px;margin:0 0 40px;letter-spacing:-.01em}
.ea-form{max-width:760px}
.ea-form .body{display:grid;gap:14px;padding:18px}
.ea-form label{display:grid;gap:6px;font:500 13px var(--mono)}
.ea-form input,.ea-form select,.ea-form textarea{font:16px var(--display);padding:10px;border:1px solid var(--ink);background:#fff;border-radius:0;width:100%;color:var(--ink)}
.ea-form .two{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.ea-form button{justify-self:start;background:var(--ink);color:#fff;border:0;padding:12px 20px;font:500 18px var(--display);letter-spacing:.03em;cursor:pointer}
.ea-form button:disabled{opacity:.6;cursor:wait}
.ea-form .hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.ea-status{margin:0;font:15px var(--mono);min-height:1.2em}
.ea-status.ok{color:#1d5e20}.ea-status.err{color:#9b1c1c}
.ea-alt{margin:18px 0 0;font:13px var(--mono)}
@media (max-width:900px){.ea-form .two{grid-template-columns:1fr}.ea{padding:80px var(--gutter)}}