/* TPU-MLIR site — shared styles. Light by default, auto dark. */
:root{
  --bg:#ffffff;
  --surface:#f7f8fb;
  --surface-2:#eef1f7;
  --text:#0e1422;
  --muted:#5a6478;
  --line:#e3e7ef;
  --line-2:#cdd5e2;
  --brand:#4338ca;
  --brand-2:#6d28d9;
  --accent:#ea580c;
  --accent-2:#0ea5a4;
  --good:#15803d;
  --code-bg:#0f1729;
  --code-text:#e6edff;
  --code-muted:#8ea0c7;
  --code-comment:#7a8aa8;
  --code-string:#a5e3a1;
  --code-flag:#ffd28a;
  --code-prompt:#7aa2ff;
  --shadow-sm:0 1px 2px rgba(15,22,40,.06);
  --shadow-md:0 6px 24px rgba(15,22,40,.08);
  --radius:10px;
  --max:1180px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b1020;
    --surface:#0f1530;
    --surface-2:#131a3a;
    --text:#e7ecf8;
    --muted:#9fb0d2;
    --line:rgba(255,255,255,.08);
    --line-2:rgba(255,255,255,.16);
    --brand:#8b9bff;
    --brand-2:#b3a3ff;
    --accent:#fb923c;
    --accent-2:#2dd4bf;
    --good:#34d399;
    --code-bg:#080d1c;
    --shadow-sm:0 1px 2px rgba(0,0,0,.4);
    --shadow-md:0 8px 32px rgba(0,0,0,.4);
  }
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,
    "PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
:lang(zh-CN), :lang(zh){line-height:1.8}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
code,pre,kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;font-size:.92em}
:not(pre)>code{
  background:var(--surface-2);padding:.12em .42em;border-radius:6px;
  border:1px solid var(--line);font-size:.88em;
}
.container{max-width:var(--max);margin:0 auto;padding:0 24px}
.kicker{
  text-transform:uppercase;letter-spacing:.16em;font-size:12px;font-weight:700;
  color:var(--accent);margin-bottom:10px;
}
section{padding:72px 0;border-top:1px solid var(--line)}
section:first-of-type{border-top:0}
h1,h2,h3,h4{margin:0 0 14px;line-height:1.2;font-weight:700;letter-spacing:-.01em}
h2{font-size:clamp(26px,3.4vw,38px)}
h3{font-size:18px}
p.lead{font-size:18px;color:var(--muted);max-width:60ch;margin:0 0 22px}
.sub{color:var(--muted);max-width:65ch;margin:0 0 28px}

header.nav{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(150%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:62px;gap:12px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--text)}
.logo .mark{
  width:30px;height:30px;border-radius:8px;
  background:linear-gradient(135deg,var(--brand),var(--accent));
  display:grid;place-items:center;color:#fff;font-weight:900;
  font-family:ui-monospace,Menlo,monospace;font-size:14px;
  box-shadow:0 4px 14px rgba(67,56,202,.35);
}
.nav-links{display:flex;gap:22px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.nav-links a{color:var(--muted);font-size:14px;font-weight:500}
.nav-links a:hover{color:var(--text);text-decoration:none}
.lang{font-size:13px;color:var(--muted);border-left:1px solid var(--line);padding-left:18px}
.lang a{color:var(--muted);margin-right:4px}
.lang a.active{color:var(--text);font-weight:700}
.nav-cta{
  display:inline-flex;align-items:center;gap:6px;
  border:1px solid var(--line-2);padding:7px 14px;border-radius:8px;color:var(--text);
  font-size:13px;font-weight:600;background:var(--surface);
}
.nav-cta:hover{text-decoration:none;border-color:var(--brand)}

.hero{padding:64px 0 32px;border-top:0}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center}
@media (max-width:880px){.hero-grid{grid-template-columns:1fr;gap:32px}}
.hero h1{font-size:clamp(34px,5.4vw,58px);line-height:1.05;margin:0 0 18px;font-weight:800;letter-spacing:-.025em}
.hero h1 .accent{
  background:linear-gradient(135deg,var(--brand),var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;color:var(--muted);
  border:1px solid var(--line);background:var(--surface);
  padding:5px 10px;border-radius:999px;font-weight:500;
}
.badge .dot{width:6px;height:6px;border-radius:50%;background:var(--good)}
.cta-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border-radius:8px;font-weight:600;font-size:14px;
  border:1px solid var(--line-2);background:var(--surface);color:var(--text);
}
.btn:hover{text-decoration:none;border-color:var(--brand)}
.btn.primary{
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;border-color:transparent;
  box-shadow:0 6px 20px rgba(67,56,202,.32);
}
.btn.primary:hover{filter:brightness(1.07)}
.btn svg{width:16px;height:16px;flex-shrink:0}

.stats{
  display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:28px;
  border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);
}
.stats .s{padding:14px 18px;border-right:1px solid var(--line)}
.stats .s:last-child{border-right:0}
.stats .v{font-size:22px;font-weight:800;color:var(--text);letter-spacing:-.01em}
.stats .v .u{font-size:14px;color:var(--muted);font-weight:600;margin-left:2px}
.stats .l{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-top:2px}

.hero-diagram{
  background:var(--surface);border:1px solid var(--line);border-radius:14px;
  padding:18px;box-shadow:var(--shadow-md);position:relative;
}
.hero-diagram .cap{font-size:12px;color:var(--muted);margin-top:10px;text-align:center}
.hero-diagram svg{width:100%;height:auto;display:block}

.grid{display:grid;gap:18px}
.cols-2{grid-template-columns:repeat(2,1fr)}
.cols-3{grid-template-columns:repeat(3,1fr)}
.cols-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:900px){.cols-3,.cols-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.cols-2,.cols-3,.cols-4{grid-template-columns:1fr}}

.card{
  border:1px solid var(--line);background:var(--surface);
  border-radius:var(--radius);padding:20px;transition:border-color .15s;
}
.card:hover{border-color:var(--line-2)}
.card .icon{
  width:36px;height:36px;border-radius:8px;display:grid;place-items:center;
  background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand);
  margin-bottom:12px;
}
.card .icon svg{width:20px;height:20px}
.card h3{margin:0 0 6px}
.card p{margin:0;color:var(--muted);font-size:14.5px}

.workflow{counter-reset:step}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media (max-width:900px){.steps{grid-template-columns:1fr}}
.step{
  counter-increment:step;
  border:1px solid var(--line);background:var(--surface);
  border-radius:var(--radius);padding:22px;position:relative;
}
.step::before{
  content:counter(step,decimal-leading-zero);
  position:absolute;top:14px;right:18px;
  font-family:ui-monospace,Menlo,monospace;font-size:13px;
  color:var(--accent);font-weight:800;letter-spacing:.1em;
}
.step h3{margin-top:0}
.step pre{margin:14px 0 0}

pre{
  background:var(--code-bg);color:var(--code-text);
  border-radius:8px;padding:14px 16px;overflow:auto;
  font-size:13px;line-height:1.55;border:1px solid rgba(255,255,255,.06);
}
.tk-c{color:var(--code-comment);font-style:italic}
.tk-p{color:var(--code-prompt);user-select:none}
.tk-s{color:var(--code-string)}
.tk-f{color:var(--code-flag)}
.tk-k{color:#c39bff;font-weight:600}

.matrix{
  display:grid;grid-template-columns:repeat(3,1fr);gap:0;
  border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);overflow:hidden;
}
@media (max-width:900px){.matrix{grid-template-columns:1fr}}
.matrix .col{padding:22px 24px;border-right:1px solid var(--line)}
.matrix .col:last-child{border-right:0}
@media (max-width:900px){
  .matrix .col{border-right:0;border-bottom:1px solid var(--line)}
  .matrix .col:last-child{border-bottom:0}
}
.matrix h4{
  margin:0 0 12px;font-size:12px;text-transform:uppercase;letter-spacing:.12em;
  color:var(--muted);font-weight:700;
}
.pill-row{display:flex;flex-wrap:wrap;gap:6px}
.pill{
  display:inline-flex;align-items:center;
  border:1px solid var(--line);background:var(--bg);
  padding:5px 11px;border-radius:999px;font-size:13px;color:var(--text);
}
.pill strong{color:var(--accent);font-weight:700;margin-right:4px}

.demo{
  border:1px solid var(--line);background:var(--surface);
  border-radius:var(--radius);overflow:hidden;
}
.demo img{width:100%;height:auto;display:block;background:#000}
.demo .cap{padding:12px 16px;font-size:13.5px;color:var(--muted)}

.qs{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media (max-width:900px){.qs{grid-template-columns:1fr}}
.qs .panel{
  border:1px solid var(--line);border-radius:var(--radius);
  background:var(--surface);overflow:hidden;
}
.qs .panel .head{
  display:flex;align-items:center;gap:8px;
  padding:12px 16px;border-bottom:1px solid var(--line);
  font-size:13px;font-weight:600;
}
.qs .panel .head .tag{
  font-size:11px;padding:2px 8px;border-radius:999px;
  background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand);
  border:1px solid color-mix(in srgb,var(--brand) 30%,transparent);font-weight:700;
}
.qs .panel pre{margin:0;border-radius:0;border:0}

.res-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
@media (max-width:700px){.res-list{grid-template-columns:1fr}}
.res-list a{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;
  color:var(--text);background:var(--surface);font-weight:500;
}
.res-list a:hover{text-decoration:none;border-color:var(--brand)}
.res-list a .k{color:var(--muted);font-size:12.5px;font-weight:500}

footer{border-top:1px solid var(--line);padding:28px 0 36px;color:var(--muted);font-size:13.5px}
.foot-inner{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center}
.foot-links a{color:var(--muted);margin-left:14px}
.foot-links a:hover{color:var(--text)}