/* zh.tou.gg landing — same tokens as the app (brief §13): dark, JetBrains Mono, flare orange, dot grid. */
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/jetbrains-mono-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/jetbrains-mono-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:700;font-display:swap;src:url(/fonts/jetbrains-mono-latin-700-normal.woff2) format("woff2")}
:root{
  --bg:#0F0F0F;--surface:#171717;--surface2:#1F1F1F;--line:#2D2D2D;--ink:#F2EFE9;--muted:#9A968F;
  --accent:#FF6A1A;--accent-ink:#FF7A33;--on-accent:#140A04;--py:#FF7A33;--uz:#5ED48E;--gram:#93A9FF;--outline:#3A3A3A;--dot:rgba(255,255,255,.075);
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --han:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;
  --kai:"Kaiti SC","STKaiti","KaiTi","BiauKai","Noto Serif SC","Songti SC",serif;
  color-scheme:dark;
}
@media (prefers-color-scheme:light){:root{
  --bg:#F4EEE1;--surface:#FFFCF5;--surface2:#F7F0E2;--line:#E2D7C2;--ink:#171512;--muted:#6B6254;
  --accent-ink:#B4480C;--py:#C8302A;--uz:#0E7A3E;--gram:#3B58D8;--outline:#E4DACA;--dot:rgba(60,40,10,.08);color-scheme:light}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 var(--sans);
  background-image:radial-gradient(var(--dot) 1px,transparent 1.3px);background-size:14px 14px}
a{color:var(--accent-ink)}
.wrap{max-width:1080px;margin:0 auto;padding:0 calc(20px + env(safe-area-inset-right,0px)) 0 calc(20px + env(safe-area-inset-left,0px))}
.row{display:flex;align-items:center;gap:14px}
.mono{font-family:var(--mono)}.muted{color:var(--muted)}.py{color:var(--py)}.uz{color:var(--uz)}.gm{color:var(--gram)}
.top{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);padding:calc(10px + env(safe-area-inset-top,0px)) 0 10px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-family:var(--mono);font-weight:500;margin-right:auto}
.logo{width:38px;height:38px;display:grid;place-items:center;border:1.5px solid var(--accent);border-radius:9px;font-family:var(--kai);font-size:23px;color:var(--accent)}
.links{display:flex;gap:18px;font-family:var(--mono);font-size:13px}
.links a{color:var(--muted);text-decoration:none}.links a:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:9px 16px;border-radius:9px;border:1px solid var(--line);
  background:var(--surface2);color:var(--ink);font-family:var(--mono);font-size:14px;text-decoration:none;white-space:nowrap}
.btn.pri{background:var(--accent);border-color:var(--accent);color:var(--on-accent);font-weight:700}
.btn.big{min-height:50px;padding:12px 22px;font-size:15px}
.btn:hover{filter:brightness(1.08)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
h1{font-family:var(--mono);font-weight:700;letter-spacing:-.03em;font-size:clamp(30px,4.6vw,50px);line-height:1.12;margin:10px 0 16px}
h2{font-family:var(--mono);font-size:24px;letter-spacing:-.02em;margin:0 0 18px}
h3{font-family:var(--mono);font-size:16px;margin:0 0 8px}
.kicker{font-family:var(--mono);font-size:13px;color:var(--muted);margin:0}
.lead{font-size:19px;max-width:62ch}
.fine{font-family:var(--mono);font-size:12.5px;color:var(--muted)}
section{padding:64px 0 8px}
.hero{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:48px;align-items:center;padding-top:64px}
.cta{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0 10px}
.writer-demo{margin:0;justify-self:center;width:min(100%,360px)}
.gridbox{position:relative;aspect-ratio:1;border:2px solid var(--accent);border-radius:10px;background:var(--surface);overflow:hidden}
.gridbox svg.g{position:absolute;inset:0;width:100%;height:100%}
.gridbox svg.g path{stroke:var(--line);stroke-width:1;stroke-dasharray:4 4;fill:none;vector-effect:non-scaling-stroke}
#demo-hw{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--kai);font-size:clamp(120px,22vw,240px);line-height:1}
.writer-demo figcaption{text-align:center;margin-top:10px;font-size:15px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px}
.card p{margin:0 0 12px;font-size:15.5px}
.mini-list{border:1px solid var(--line);border-radius:10px;overflow:hidden;font-size:15px}
.mini-list .it{display:grid;grid-template-columns:28px 34px 44px 1fr;align-items:center;gap:8px;padding:7px 10px;border-top:1px solid var(--line)}
.mini-list .it:first-child{border-top:0}
.mini-list .n{font-family:var(--mono);font-size:12px;color:var(--muted)}
.mini-list b{font-family:var(--han);font-size:22px;font-weight:500}
.cov{height:18px;border-radius:5px;background:repeating-linear-gradient(135deg,var(--surface2) 0 5px,var(--line) 5px 6px)}
.strip{display:flex;gap:5px;flex-wrap:wrap}
.step{position:relative;border:1px solid var(--line);border-radius:6px;background:var(--bg)}
.step svg{display:block}.step i{position:absolute;right:3px;top:0;font:9px var(--mono);color:var(--muted)}
.sd{fill:var(--ink)}.sk{fill:var(--accent)}.sf{fill:var(--outline)}
.tones{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.tones span{border:1px solid var(--line);border-radius:10px;text-align:center;padding:8px 0;font-size:22px;color:var(--py);background:var(--bg)}
.tones span i{display:block;font:11px var(--mono);color:var(--muted);font-style:normal}
.tones span.on{border-color:var(--uz)}
.hw{border-left:3px solid var(--accent);padding:4px 0 4px 12px;font-size:14.5px;display:grid;gap:6px}
.tag{display:inline-block;font:11px var(--mono);padding:2px 8px;border-radius:999px;border:1px solid var(--line)}
.tag.o{color:var(--accent-ink);border-color:color-mix(in srgb,var(--accent) 45%,transparent)}
.tag.g{color:var(--uz);border-color:color-mix(in srgb,var(--uz) 45%,transparent)}
.tag.b{color:var(--gram);border-color:color-mix(in srgb,var(--gram) 45%,transparent)}
.sent{display:grid;gap:2px}.sent b{font-family:var(--han);font-size:24px;font-weight:500}
.chips{display:flex;gap:6px}.chips span{min-width:36px;height:36px;border-radius:999px;border:1px solid var(--line);display:grid;place-items:center;font-family:var(--mono);font-size:13px}
.chips .on{border-color:var(--accent);color:var(--accent-ink)}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:12px;max-width:760px}
.steps li{counter-increment:s;position:relative;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 18px 16px 62px}
.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:18px;top:16px;font-family:var(--mono);color:var(--accent-ink);font-weight:700}
.teacher .lead{margin-top:0}
details{border-top:1px solid var(--line);padding:6px 0;max-width:760px}
details:last-of-type{border-bottom:1px solid var(--line)}
summary{cursor:pointer;font-family:var(--mono);font-size:15px;padding:10px 0;min-height:44px}
details p{margin:0 0 12px;color:var(--muted)}
.end{text-align:center;padding:72px 0 48px}
.big-hz{font-family:var(--kai);font-size:96px;margin:0;line-height:1;color:var(--accent)}
.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding:22px 20px calc(28px + env(safe-area-inset-bottom,0px));border-top:1px solid var(--line);font-size:13px;font-family:var(--mono)}
@media (max-width:860px){
  .hero{grid-template-columns:1fr;gap:28px;padding-top:36px}
  .grid,.grid.two{grid-template-columns:1fr}
  .links{display:none}
  .writer-demo{width:min(78vw,300px)}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}