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

:root {
  color-scheme: dark;
  --bg: #0a0c10;
  --surface: #12151c;
  --surface2: #1a1e28;
  --border: #2a3040;
  --border-light: #3a4258;
  --text: #e8eaf0;
  --text-dim: #7a8298;
  --text-muted: #505872;

  --blue: #5b8af5;
  --blue-bg: rgba(91,138,245,0.08);
  --blue-border: rgba(91,138,245,0.25);
  --teal: #2dd4bf;
  --teal-bg: rgba(45,212,191,0.08);
  --amber: #f59e0b;
  --amber-bg: rgba(245,158,11,0.08);
  --amber-border: rgba(245,158,11,0.25);
  --green: #22c55e;
  --green-bg: rgba(34,197,94,0.08);
  --red: #ef4444;
  --red-bg: rgba(239,68,68,0.08);
  --violet: #8b5cf6;
}

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

html, body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

main.doc {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px 96px;
}

/* ── Top nav ── */
.nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  align-items: center;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.2px;
}
.nav a:hover { color: var(--text); }
.nav a.active { color: var(--blue); }
.nav .brand {
  color: var(--text);
  font-weight: 700;
  margin-right: auto;
  letter-spacing: -0.2px;
}
.nav .brand em { color: var(--blue); font-style: normal; }

/* ── Typography ── */
h1 { font-size: 26px; font-weight: 700; letter-spacing: -0.4px; margin-bottom: 6px; }
h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 44px 0 14px;
  color: var(--blue);
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
  letter-spacing: -0.1px;
}
h3 { font-size: 15px; font-weight: 600; margin: 22px 0 8px; color: var(--text); }
h4 {
  font-size: 12px;
  font-weight: 600;
  margin: 18px 0 6px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.7px;
}

p, li { font-size: 14px; color: var(--text); }
p { margin-bottom: 12px; }
.sub { font-size: 14px; color: var(--text-dim); margin-bottom: 22px; }

ul, ol { padding-left: 22px; margin-bottom: 14px; }
li { margin-bottom: 4px; }

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

strong { color: var(--text); font-weight: 600; }
em { color: var(--text-dim); font-style: italic; }

/* ── Code ── */
code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  background: var(--surface2);
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid var(--border);
  color: var(--teal);
}
pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 12px 0 18px;
}
pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: var(--text);
  font-size: 12.5px;
  line-height: 1.55;
}

/* ── Tables ── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 18px;
  font-size: 13px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
th, td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th {
  background: var(--surface2);
  font-weight: 600;
  color: var(--text-dim);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
tbody tr:last-child td { border-bottom: 0; }

/* ── Callouts ── */
.callout {
  padding: 10px 14px;
  border-radius: 6px;
  margin: 12px 0 18px;
  font-size: 13px;
  border-left: 3px solid var(--amber);
  background: var(--amber-bg);
  color: var(--text);
}
.callout.good { border-left-color: var(--green); background: var(--green-bg); }
.callout.bad  { border-left-color: var(--red);   background: var(--red-bg); }
.callout strong { color: var(--text); }

/* ── Pills ── */
.pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2px;
  margin-right: 4px;
  vertical-align: middle;
  background: var(--surface2);
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.pill-shipped  { background: var(--green-bg); color: var(--green); border-color: rgba(34,197,94,0.3); }
.pill-partial  { background: var(--amber-bg); color: var(--amber); border-color: var(--amber-border); }
.pill-proposed { background: var(--blue-bg);  color: var(--blue);  border-color: var(--blue-border); }
.pill-build    { background: var(--blue-bg);  color: var(--blue);  border-color: var(--blue-border); }
.pill-buy      { background: var(--amber-bg); color: var(--amber); border-color: var(--amber-border); }
.pill-hyb      { background: var(--green-bg); color: var(--green); border-color: rgba(34,197,94,0.3); }

/* ── Cards & grid ── */
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 720px) { .grid { grid-template-columns: 1fr; } }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.card h3 { margin-top: 0; }

/* ── Mermaid diagram wrapper ── */
.diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin: 12px 0 20px;
  overflow-x: auto;
}
.diagram .mermaid {
  display: flex;
  justify-content: center;
  background: transparent;
}
.diagram .mermaid svg {
  max-width: 100% !important;
  height: auto !important;
  background: transparent !important;
}

/* ── Footer ── */
.doc-footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}
.doc-footer a { color: var(--text-dim); margin: 0 4px; }
.doc-footer a:hover { color: var(--text); }