/* TalkBridge betadoc — one skin for the site and the documentation page.
   Self-contained: system fonts, no CDN, no external request of any kind. */

:root {
  --ground: #f4f6f7;
  --surface: #ffffff;
  --sunk: #e9eff0;
  --ink: #0f1a1c;
  --ink2: #3d4f54;
  --muted: #667a7f;
  --rule: #d3dee0;
  --rule2: #e5ecee;
  --signal: #0b6f6a;
  --signal-lift: #e2f1ef;
  --built: #14713f;
  --built-lift: #dcf1e5;
  --partial: #96590a;
  --partial-lift: #f8ecd8;
  --road: #667a7f;
  --road-lift: #eceff0;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #0b1214;
    --surface: #121d20;
    --sunk: #0e181a;
    --ink: #e6eef0;
    --ink2: #bccacd;
    --muted: #8ba0a5;
    --rule: #27373b;
    --rule2: #1b292c;
    --signal: #4fc4bb;
    --signal-lift: #0f2f2d;
    --built: #4ade80;
    --built-lift: #08301b;
    --partial: #e0b154;
    --partial-lift: #2d2311;
    --road: #8ba0a5;
    --road-lift: #1a2528;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 62rem; margin: 0 auto; padding: 0 1.5rem; }
.narrow { max-width: 44rem; }

a { color: var(--signal); text-underline-offset: 2px; }

/* ------------------------------------------------------------- topbar -- */

.topbar {
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
  position: sticky; top: 0; z-index: 10;
}
.topbar .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding-top: 0.9rem; padding-bottom: 0.9rem;
}
.brand { font-weight: 700; letter-spacing: -0.02em; font-size: 1.05rem; text-decoration: none; color: var(--ink); }
.brand span { color: var(--signal); }
.topnav { display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; }
.topnav a { font-size: 0.9rem; text-decoration: none; color: var(--ink2); }
.topnav a:hover { color: var(--ink); }
.topnav a.cta {
  background: var(--signal); color: #fff; padding: 0.45rem 0.9rem;
  border-radius: 4px; font-weight: 600;
}

/* --------------------------------------------------------------- hero -- */

.hero { padding: 4rem 0 3rem; border-bottom: 1px solid var(--rule); }
.kicker {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--signal); margin: 0 0 1.1rem;
}
h1 {
  font-size: clamp(2.3rem, 6.5vw, 3.6rem); line-height: 1.03;
  letter-spacing: -0.035em; margin: 0 0 1.1rem; text-wrap: balance;
}
.lede { font-size: 1.2rem; line-height: 1.55; color: var(--ink2); max-width: 38em; margin: 0 0 1.75rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
.btn {
  display: inline-block; padding: 0.7rem 1.25rem; border-radius: 5px;
  font-weight: 600; font-size: 0.95rem; text-decoration: none;
  border: 1px solid var(--signal);
}
.btn-primary { background: var(--signal); color: #fff; }
.btn-ghost { background: transparent; color: var(--signal); }

.stats { display: flex; flex-wrap: wrap; gap: 2.5rem; margin-top: 2.5rem; }
.stat .n { display: block; font-size: 1.8rem; font-weight: 700; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.stat .k { display: block; font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-top: 0.4rem; }

/* ------------------------------------------------------------ section -- */

section { padding: 3.5rem 0; border-bottom: 1px solid var(--rule2); }
section:last-of-type { border-bottom: none; }
h2 { font-size: 1.75rem; letter-spacing: -0.025em; margin: 0 0 0.6rem; text-wrap: balance; }
h3 { font-size: 1.05rem; margin: 0 0 0.4rem; letter-spacing: -0.01em; }
p { margin: 0 0 1rem; max-width: 65ch; }
.section-lede { font-size: 1.05rem; color: var(--ink2); max-width: 60ch; margin-bottom: 2rem; }

code { font-family: var(--mono); font-size: 0.87em; background: var(--sunk); border: 1px solid var(--rule2); border-radius: 3px; padding: 0.08em 0.34em; }
pre { font-family: var(--mono); font-size: 0.82rem; background: var(--sunk); border: 1px solid var(--rule2); border-radius: 5px; padding: 0.9rem 1rem; overflow-x: auto; line-height: 1.5; }
pre code { background: none; border: none; padding: 0; }

.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1.5rem; }
.card { background: var(--surface); border: 1px solid var(--rule2); border-radius: 6px; padding: 1.25rem; }
.card p { font-size: 0.94rem; color: var(--ink2); margin: 0; max-width: none; }

.scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; min-width: 36rem; }
th { text-align: left; font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); padding: 0 0.85rem 0.6rem 0; border-bottom: 1px solid var(--ink); white-space: nowrap; }
td { padding: 0.75rem 0.85rem 0.75rem 0; border-bottom: 1px solid var(--rule2); vertical-align: top; }
td.num { font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }

.pill { display: inline-block; font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase; padding: 0.2rem 0.5rem; border-radius: 3px; font-weight: 600; white-space: nowrap; }
.pill-built { background: var(--built-lift); color: var(--built); }
.pill-partial { background: var(--partial-lift); color: var(--partial); }
.pill-road { background: var(--road-lift); color: var(--road); }

.lanes { display: grid; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); gap: 1.5rem; }
.lane { background: var(--surface); border: 1px solid var(--rule2); border-top: 3px solid var(--signal); border-radius: 6px; padding: 1.4rem; }
.lane h3 { margin-bottom: 0.5rem; }
.lane .tag { font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); display: block; margin-bottom: 0.75rem; }
.lane ul { margin: 0.75rem 0 0; padding-left: 1.1rem; font-size: 0.92rem; color: var(--ink2); }
.lane li { margin-bottom: 0.35rem; }

.callout { background: var(--signal-lift); border-left: 3px solid var(--signal); padding: 1rem 1.15rem; border-radius: 0 5px 5px 0; margin: 1.75rem 0; }
.callout p { margin: 0; font-size: 0.96rem; }

svg { max-width: 100%; height: auto; }

footer { border-top: 1px solid var(--rule); padding: 2.5rem 0 3.5rem; color: var(--muted); font-size: 0.86rem; }
footer a { color: var(--ink2); }

/* -------------------------------------------------------------- docs --- */

.doclayout { display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 3rem; align-items: start; padding: 2.5rem 0 4rem; }
.toc { position: sticky; top: 5rem; font-size: 0.9rem; }
.toc h4 { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin: 0 0 0.75rem; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { margin-bottom: 0.5rem; }
.toc a { text-decoration: none; color: var(--ink2); }
.toc a:hover { color: var(--signal); }
.doc section { padding: 0 0 2.5rem; border-bottom: 1px solid var(--rule2); margin-bottom: 2.5rem; }
.doc section:last-child { border-bottom: none; }

@media (max-width: 800px) {
  .doclayout { grid-template-columns: 1fr; gap: 1.5rem; }
  .toc { position: static; }
}

a:focus-visible, button:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }