@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #111113;
  --surface: #18181b;
  --surface-2: #1f1f23;
  --border: #27272a;
  --border-h: #3f3f46;
  --t1: #fafafa;
  --t2: #a1a1aa;
  --t3: #71717a;
  --t4: #52525b;
  --blue: #3b82f6;
  --blue-dim: rgba(59,130,246,0.12);
  --green: #22c55e;
  --green-dim: rgba(34,197,94,0.1);
  --amber: #f59e0b;
  --amber-dim: rgba(245,158,11,0.1);
  --red: #ef4444;
  --red-dim: rgba(239,68,68,0.1);
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --sidebar: 250px;
  --toc: 200px;
  --header: 52px;
  --content-max: 720px;
  --radius: 8px;
}

html { background: var(--bg); color-scheme: dark; scroll-behavior: smooth; }

body {
  font: 400 14.5px/1.65 var(--sans);
  color: var(--t2);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ═══ HEADER ═══ */
.hdr {
  position: fixed; inset: 0 0 auto; height: var(--header);
  background: rgba(17,17,19,0.82); backdrop-filter: blur(12px) saturate(1.6);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; z-index: 100;
}

.hdr-left { display: flex; align-items: center; gap: 10px; }

.hdr-logo {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--t1);
}

.hdr-logo img { width: 22px; height: 22px; border-radius: 4px; }
.hdr-logo span { font-weight: 600; font-size: 14px; letter-spacing: -0.01em; }

.hdr-sep { color: var(--t4); font-weight: 300; font-size: 18px; }
.hdr-label { font-size: 14px; color: var(--t3); }

.hdr-pill {
  font: 500 10px var(--mono); color: var(--t3);
  background: var(--surface); border: 1px solid var(--border);
  padding: 2px 6px; border-radius: 99px;
}

.hdr-right { display: flex; align-items: center; gap: 6px; }

.hdr-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font: 500 13px var(--sans); color: var(--t3);
  background: var(--surface); border: 1px solid var(--border);
  padding: 5px 12px; border-radius: 6px; cursor: pointer;
  transition: all .12s ease;
}

.hdr-btn:hover { color: var(--t1); border-color: var(--border-h); background: var(--surface-2); }
.hdr-btn svg { width: 14px; height: 14px; flex-shrink: 0; }

/* ═══ LAYOUT ═══ */
.shell { display: flex; padding-top: var(--header); min-height: 100vh; }

/* ═══ SIDEBAR ═══ */
.side {
  width: var(--sidebar); position: fixed;
  top: var(--header); bottom: 0; left: 0;
  border-right: 1px solid var(--border);
  overflow-y: auto; padding: 16px 10px; z-index: 50;
}

.side::-webkit-scrollbar { width: 0; }

.sg { margin-bottom: 20px; }

.sg-label {
  font: 600 10.5px var(--sans);
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--t4); padding: 0 10px; margin-bottom: 3px;
}

.sg ul { list-style: none; }

.sl {
  display: flex; align-items: center; gap: 7px;
  font-size: 13px; color: var(--t3);
  padding: 5px 10px; border-radius: 6px;
  transition: all .1s ease;
}

.sl:hover { color: var(--t2); background: var(--surface); }
.sl.on { color: var(--t1); background: var(--surface-2); font-weight: 500; }
.sl svg { width: 15px; height: 15px; opacity: .5; flex-shrink: 0; }
.sl.on svg { opacity: .8; }

/* ═══ CONTENT ═══ */
.main {
  margin-left: var(--sidebar); flex: 1;
  max-width: var(--content-max);
  padding: 40px 48px 96px;
}

.pg { display: none; }
.pg.on { display: block; animation: fade .15s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(2px); } to { opacity: 1; } }

.crumb { font-size: 12px; color: var(--t4); margin-bottom: 6px; }
.crumb b { color: var(--t3); font-weight: 500; }

h1 {
  font-size: 26px; font-weight: 700; color: var(--t1);
  letter-spacing: -0.025em; margin-bottom: 6px; line-height: 1.2;
}

.lead { font-size: 15px; color: var(--t2); margin-bottom: 32px; line-height: 1.6; }

h2 {
  font-size: 16px; font-weight: 600; color: var(--t1);
  letter-spacing: -0.01em;
  margin: 32px 0 10px; padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

h3 { font-size: 14px; font-weight: 600; color: var(--t1); margin: 20px 0 6px; }
h4 { font-size: 13px; font-weight: 600; color: var(--t1); margin: 14px 0 4px; }

p { margin-bottom: 12px; }
strong { color: var(--t1); font-weight: 500; }
em { color: var(--t3); }

ul, ol { padding-left: 18px; margin-bottom: 14px; }
li { margin-bottom: 4px; font-size: 14px; }

code {
  font: 500 12.5px var(--mono);
  background: var(--surface-2); color: #e4e4e7;
  padding: 2px 5px; border-radius: 4px;
}

hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }

/* ═══ RIGHT TOC ═══ */
.toc {
  width: var(--toc); position: fixed;
  top: calc(var(--header) + 40px);
  right: 24px; z-index: 40;
  display: none;
}

@media (min-width: 1200px) { .toc { display: block; } }

.toc-label {
  font: 600 10px var(--sans);
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--t4); margin-bottom: 8px; padding-left: 10px;
}

.toc ul { list-style: none; border-left: 1px solid var(--border); }

.toc li a {
  display: block; font-size: 12px; color: var(--t4);
  padding: 3px 0 3px 10px; margin-left: -1px;
  border-left: 2px solid transparent;
  transition: all .1s ease;
}

.toc li a:hover { color: var(--t2); }

.toc li a.on {
  color: var(--blue); border-left-color: var(--blue);
  font-weight: 500;
}

/* ═══ CARDS ═══ */
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 20px 0; }

.crd {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px;
  transition: border-color .12s;
}

.crd:hover { border-color: var(--border-h); }

.crd-icon { margin-bottom: 8px; color: var(--t3); }
.crd-icon svg { width: 18px; height: 18px; }

.crd h4 { font-size: 13.5px; font-weight: 600; color: var(--t1); margin-bottom: 4px; }
.crd p { font-size: 12.5px; color: var(--t3); line-height: 1.5; margin: 0; }

/* ═══ CODE BLOCKS ═══ */
.cb {
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; margin: 14px 0;
}

.cb-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 5px 10px; background: var(--surface); border-bottom: 1px solid var(--border);
}

.cb-lang { font: 500 10px var(--mono); color: var(--t4); text-transform: uppercase; letter-spacing: .04em; }

.cb-copy {
  display: inline-flex; align-items: center; gap: 4px;
  font: 500 11px var(--sans); color: var(--t4);
  background: transparent; border: 1px solid var(--border);
  padding: 2px 7px; border-radius: 4px; cursor: pointer;
  transition: all .12s;
}

.cb-copy:hover { color: var(--t2); border-color: var(--border-h); }
.cb-copy svg { width: 12px; height: 12px; }

pre {
  padding: 12px 14px; background: #0f0f11;
  overflow-x: auto; font: 400 13px/1.6 var(--mono); color: #d4d4d8;
}

pre code { background: none; padding: 0; color: inherit; font-size: inherit; }

/* syntax colors for code */
.kw { color: #c084fc; }
.fn { color: #60a5fa; }
.str { color: #86efac; }
.cm { color: #52525b; }
.num { color: #fbbf24; }

/* ═══ TABS ═══ */
.tabs { margin: 16px 0; }

.tab-row {
  display: flex; gap: 0;
  border-bottom: 1px solid var(--border);
}

.tab-t {
  background: none; border: none; font: 500 12.5px var(--sans);
  color: var(--t4); padding: 7px 12px; cursor: pointer;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: all .1s;
}

.tab-t:hover { color: var(--t3); }
.tab-t.on { color: var(--t1); border-bottom-color: var(--t1); }

.tab-p { display: none; }
.tab-p.on { display: block; }

/* ═══ CALLOUT ═══ */
.callout {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 12px 14px; border-radius: var(--radius);
  margin: 16px 0; font-size: 13px; line-height: 1.5;
}

.callout svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 1px; }
.callout p { margin: 0; }
.callout code { background: rgba(255,255,255,0.06); }

.callout.info { background: var(--blue-dim); color: #93c5fd; }
.callout.info svg { color: var(--blue); }

.callout.safe { background: var(--green-dim); color: #86efac; }
.callout.safe svg { color: var(--green); }

.callout.warn { background: var(--amber-dim); color: #fcd34d; }
.callout.warn svg { color: var(--amber); }

.callout.danger { background: var(--red-dim); color: #fca5a5; }
.callout.danger svg { color: var(--red); }

/* ═══ TABLE ═══ */
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 13px; }
th, td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { font: 600 10px var(--sans); text-transform: uppercase; letter-spacing: .05em; color: var(--t4); }
td { color: var(--t2); }
td strong { color: var(--t1); }

/* ═══ CHANGELOG ═══ */
.rel {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; margin-bottom: 16px;
}

.rel-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 8px; }
.rel-tag { font: 600 15px var(--sans); color: var(--t1); }
.rel-date { font: 400 12px var(--sans); color: var(--t4); }

/* ═══ STEP LIST ═══ */
.steps { counter-reset: step; list-style: none; padding-left: 0; }
.steps li {
  counter-increment: step; padding-left: 28px; position: relative;
  margin-bottom: 10px; font-size: 14px;
}
.steps li::before {
  content: counter(step);
  position: absolute; left: 0; top: 1px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--surface-2); border: 1px solid var(--border);
  font: 600 10px var(--sans); color: var(--t3);
  display: flex; align-items: center; justify-content: center;
}

/* ═══ INLINE BADGE ═══ */
.badge {
  display: inline-block; font: 500 10px var(--mono);
  padding: 1px 6px; border-radius: 4px;
  vertical-align: middle; margin-left: 4px;
}
.badge.rust { background: #7c2d121a; color: #fca5a5; border: 1px solid #7c2d1233; }
.badge.python { background: #1e3a5f1a; color: #93c5fd; border: 1px solid #1e3a5f33; }
.badge.ci { background: #14532d1a; color: #86efac; border: 1px solid #14532d33; }

/* ═══ VERDICT BADGES ═══ */
.v-badge {
  display: inline-block; font: 600 11px var(--mono);
  padding: 2px 8px; border-radius: 4px;
}
.v-badge.ac { background: var(--green-dim); color: #86efac; border: 1px solid rgba(34,197,94,0.25); }
.v-badge.tle { background: var(--amber-dim); color: #fcd34d; border: 1px solid rgba(245,158,11,0.25); }
.v-badge.mle { background: var(--amber-dim); color: #fdba74; border: 1px solid rgba(249,115,22,0.25); }
.v-badge.wa { background: var(--red-dim); color: #fca5a5; border: 1px solid rgba(239,68,68,0.25); }
.v-badge.re { background: var(--red-dim); color: #f87171; border: 1px solid rgba(220,38,38,0.25); }

/* ═══ ARCH DIAGRAM ═══ */
.arch-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; margin: 16px 0;
  font: 400 12.5px/1.55 var(--mono); color: var(--t2);
  overflow-x: auto; white-space: pre;
}

/* ═══ RESPONSIVE ═══ */
@media (max-width: 800px) {
  .side { display: none; }
  .main { margin-left: 0; padding: 24px 16px; }
  .grid { grid-template-columns: 1fr; }
}