:root{
  --paper:#f5f2ea;
  --paper-2:#fffdf8;
  --ink:#17140f;
  --ink-2:#3b362e;
  --muted:#7b7365;
  --faint:#9c9486;
  --line:#e4ddcd;
  --line-2:#d2c9b5;
  --accent:#bf4a2b;      /* 朱砂 / 陶土 */
  --accent-2:#12504a;    /* 松墨 */
  --code-bg:#efe9db;
  --serif:"Fraunces",Georgia,"Songti SC",serif;
  --sans:"Instrument Sans",-apple-system,"Segoe UI","Noto Sans SC",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  --maxw:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font:16px/1.72 var(--sans);
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
code{font-family:var(--mono);font-size:.85em;background:var(--code-bg);
  border:1px solid var(--line);border-radius:5px;padding:.08em .4em;color:#2c2822}
pre{margin:0;background:#1c1a15;color:#efe9dc;border-radius:12px;padding:18px 20px;overflow:auto}
pre code{background:none;border:none;color:inherit;padding:0;font-size:12.6px;line-height:1.6}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}

/* grain overlay */
.grain{position:fixed;inset:0;pointer-events:none;z-index:100;opacity:.4;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E")}

/* nav */
.nav{position:sticky;top:0;z-index:20;background:rgba(245,242,234,.82);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--serif);font-weight:600;font-size:17px;letter-spacing:.2px}
.logo{display:inline-grid;place-items:center;width:31px;height:31px;border-radius:9px;background:var(--ink);
  color:var(--paper-2);font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.5px}
.links{display:flex;gap:26px;font-size:14px;color:var(--muted)}
.links a{display:inline-flex;gap:7px;align-items:center;transition:color .2s}
.links a i{font-style:normal;font-family:var(--mono);font-size:11px;color:var(--faint)}
.links a:hover{color:var(--ink)}

/* hero */
.hero{padding:104px 0 84px;max-width:var(--maxw)}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.28em;text-transform:uppercase;color:var(--accent);
  margin:0 0 26px;display:flex;align-items:center;gap:12px}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--accent);display:inline-block}
.hero h1{font-family:var(--serif);font-weight:600;font-size:clamp(38px,6.4vw,74px);line-height:1.04;
  letter-spacing:-.02em;margin:0 0 30px;max-width:15ch}
.hero h1 em{font-style:italic;font-weight:500;color:var(--accent)}
.lead{max-width:60ch;color:var(--ink-2);font-size:clamp(16px,1.5vw,19.5px);margin:0 0 38px}
.lead strong{font-weight:600;border-bottom:2px solid var(--accent);padding-bottom:1px}
.cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:64px}
.btn{display:inline-flex;align-items:center;padding:13px 26px;border-radius:999px;font-size:15px;font-weight:500;
  transition:transform .25s cubic-bezier(.2,.7,.3,1),box-shadow .25s,background .2s}
.btn.solid{background:var(--ink);color:var(--paper-2)}
.btn.solid:hover{transform:translateY(-2px);box-shadow:0 14px 30px -14px rgba(23,20,15,.7)}
.btn.ghost{border:1px solid var(--line-2);color:var(--ink)}
.btn.ghost:hover{background:var(--paper-2);transform:translateY(-2px)}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:2px;margin:0;
  border-top:1px solid var(--line)}
.facts>div{padding:20px 4px 0}
.facts dt{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:8px}
.facts dd{margin:0;font-size:14.5px;color:var(--ink-2)}

/* sections */
.section{padding:76px 0;border-top:1px solid var(--line)}
.sec-head{display:flex;align-items:baseline;gap:18px;margin-bottom:14px}
.sec-head .num{font-family:var(--mono);font-size:12px;color:var(--accent);padding-top:6px}
.sec-head h2{font-family:var(--serif);font-weight:600;font-size:clamp(26px,3.4vw,38px);letter-spacing:-.01em;margin:0}
.sec-head .rule{flex:1;height:1px;background:var(--line)}
.sec-sub{color:var(--muted);margin:0 0 38px;max-width:62ch}

.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:16px;overflow:hidden}
.card{background:var(--paper-2);padding:30px 30px 34px;position:relative;transition:background .3s}
.card:hover{background:#fffefb}
.card .k{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--accent);display:block;margin-bottom:22px}
.card h3{font-family:var(--serif);font-weight:600;font-size:20px;margin:0 0 10px}
.card p{margin:0;color:var(--muted);font-size:14.5px;line-height:1.65}

/* downloads */
.dl{display:flex;flex-direction:column;gap:12px}
.dl-row{display:grid;grid-template-columns:56px 1fr auto;gap:22px;align-items:center;
  background:var(--paper-2);border:1px solid var(--line);border-radius:15px;padding:22px 26px;
  transition:transform .28s cubic-bezier(.2,.7,.3,1),box-shadow .28s,border-color .25s}
.dl-row:hover{transform:translateY(-3px);box-shadow:0 22px 44px -30px rgba(23,20,15,.55);border-color:var(--line-2)}
.dl-glyph{width:56px;height:56px;border-radius:13px;display:grid;place-items:center;background:var(--paper);
  border:1px solid var(--line);font-size:22px;color:var(--accent-2)}
.dl-top{display:flex;align-items:center;gap:10px;margin-bottom:7px}
.dl-plat{font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--ink)}
.chip{font-family:var(--mono);font-size:11px;color:var(--accent);border:1px solid color-mix(in srgb,var(--accent) 40%,transparent);
  background:color-mix(in srgb,var(--accent) 8%,transparent);border-radius:999px;padding:2px 9px;letter-spacing:.02em}
.dl-info b{display:block;font-size:16.5px;font-weight:600;margin-bottom:3px}
.dl-info span{display:block;color:var(--faint);font-size:13px}
.dl-info em{display:block;color:var(--muted);font-size:13.5px;font-style:normal;margin-top:7px;max-width:60ch}
.dl-act{display:inline-flex;align-items:center;gap:8px;font-size:14.5px;font-weight:500;color:var(--ink);
  border-bottom:1.5px solid var(--ink);padding-bottom:3px;white-space:nowrap;transition:gap .25s,color .2s}
.dl-act:hover{gap:13px;color:var(--accent);border-color:var(--accent)}

/* steps */
.step-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px;margin-bottom:40px}
.step{background:var(--paper-2);border:1px solid var(--line);border-radius:15px;padding:26px 26px 30px}
.step h3{font-family:var(--serif);font-weight:600;font-size:18px;display:flex;align-items:center;gap:12px;margin:0 0 16px}
.step h3 span{font-family:var(--mono);font-size:12px;color:var(--paper-2);background:var(--ink);border-radius:7px;
  padding:3px 8px;font-weight:400}
.step ul{margin:0;padding-left:18px;color:var(--muted);font-size:14.5px}
.step li{margin:9px 0}
.step b{color:var(--ink)}
.step p.mini{color:var(--muted);font-size:14px;margin:0 0 14px}
.step pre{margin:14px 0}
.warn{background:linear-gradient(0deg,color-mix(in srgb,var(--accent) 6%,var(--paper-2)),var(--paper-2));
  border:1px solid color-mix(in srgb,var(--accent) 30%,var(--line));border-radius:14px;padding:20px 24px;
  color:var(--ink-2);font-size:14.5px}
.warn b{color:var(--accent);font-weight:600;margin-right:4px}

/* changelog */
.cl-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:26px;border-bottom:1px solid var(--line);padding-bottom:0}
.cl-tab{appearance:none;background:none;border:none;border-bottom:2px solid transparent;cursor:pointer;
  font-family:var(--sans);font-size:14.5px;color:var(--muted);padding:11px 16px;display:inline-flex;align-items:center;
  gap:9px;margin-bottom:-1px;transition:color .2s,border-color .2s}
.cl-tab:hover{color:var(--ink)}
.cl-tab.is-active{color:var(--ink);border-color:var(--ink)}
.cl-panel{display:none}
.cl-panel.is-active{display:block;animation:fade .4s ease}
.cl-panel h4{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);
  margin:26px 0 10px}
.cl-panel h4:first-child{margin-top:0}
.cl-panel h3{font-family:var(--serif);font-weight:600;font-size:22px;margin:0 0 14px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.cl-panel h3 .date{font-family:var(--mono);font-size:12px;font-weight:400;color:var(--faint)}
.cl-panel ul{margin:0 0 6px;padding-left:20px;color:var(--muted);font-size:14.5px}
.cl-panel li{margin:8px 0}
.cl-panel strong{color:var(--ink-2);font-weight:600}

/* footer */
footer{border-top:1px solid var(--line);padding:46px 0 70px}
.foot-in{display:flex;flex-direction:column;gap:16px}
.foot-brand{display:flex;align-items:center;gap:11px;font-family:var(--serif);font-weight:600;font-size:16px}
.foot-vers{display:flex;gap:10px;flex-wrap:wrap}
.foot-vers .fv{display:inline-flex;gap:8px;align-items:center;font-family:var(--mono);font-size:12px;color:var(--muted);
  border:1px solid var(--line);border-radius:999px;padding:4px 12px}
.foot-vers .fv b{color:var(--ink);font-weight:500}
.foot-meta{font-size:13.5px;color:var(--faint)}
.foot-meta a{color:var(--accent-2);border-bottom:1px solid var(--line-2)}

/* reveal */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .8s ease,transform .8s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

@media (max-width:640px){
  .wrap{padding:0 20px}
  .hero{padding:70px 0 56px}
  .links{gap:16px}
  .links a i{display:none}
  .dl-row{grid-template-columns:44px 1fr;grid-template-areas:"g m" "a a";gap:16px}
  .dl-glyph{grid-area:g;width:44px;height:44px;font-size:18px}
  .dl-info{grid-area:m}
  .dl-act{grid-area:a;justify-self:start}
}