/* Geist and Geist Mono, SIL Open Font License 1.1, self-hosted.
   Latin subset only — the site is English. Serving from the same origin removes the only
   third-party request the page makes.

   These are VARIABLE fonts: Google returns one identical file per weight (verified by md5 —
   four "weights" of Geist were the same 29,288 bytes). Declaring a weight range serves one
   file instead of four and cuts the font payload from 159.5 KB to 51.2 KB. */

@font-face {
  font-family: 'Geist';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('/assets/fonts/geist-variable.woff2') format('woff2-variations'),
       url('/assets/fonts/geist-variable.woff2') format('woff2');
}

@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url('/assets/fonts/geist-mono-variable.woff2') format('woff2-variations'),
       url('/assets/fonts/geist-mono-variable.woff2') format('woff2');
}

/* Keel — visual system.
   Palette and type are lifted from trystudio.ai's system: a near-black ground with the
   whole hierarchy built from white at different opacities, and colour reserved for meaning.
   The accent is Keel's own copper rather than their YC orange. */

:root {
  --bg: #141414;
  --bg-lift: #191919;
  --fg: #ffffff;
  --fg-strong: rgba(255, 255, 255, 0.8);
  --fg-body: rgba(255, 255, 255, 0.7);
  --fg-secondary: #a3a3b0;
  --fg-tertiary: rgba(255, 255, 255, 0.62);   /* 3.83:1 -> 7.0:1 */
  --fg-quaternary: rgba(255, 255, 255, 0.55);  /* 1.86:1 -> 5.6:1 */

  --surface: rgba(255, 255, 255, 0.04);
  --surface-strong: rgba(255, 255, 255, 0.08);
  --line-soft: rgba(255, 255, 255, 0.08);
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.24);

  --accent: #e0894a;
  --accent-dim: rgba(224, 137, 74, 0.16);
  --positive: #5bbf9a;
  --negative: #d96a6a;
  --warn: #d9b45b;
  --info: #6aa3d8;

  --sans: Geist, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wide: 72rem;
  --mid: 48rem;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg-strong);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 clamp(20px, 5vw, 40px); }
.narrow { max-width: var(--mid); }

/* ---- type ---- */
h1, h2, h3 { color: var(--fg); margin: 0; text-wrap: balance; font-weight: 600; letter-spacing: -0.022em; }
h1 { font-size: clamp(34px, 5.6vw, 60px); line-height: 1.04; }
h2 { font-size: clamp(25px, 3.2vw, 36px); line-height: 1.14; }
h3 { font-size: 19px; line-height: 1.3; letter-spacing: -0.012em; }
p { margin: 0; color: var(--fg-body); }
a { color: var(--fg-strong); }

/* The `label // qualifier` tag Studio uses to caption every visual. */
.tag {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--fg-tertiary);
  text-transform: lowercase;
}
.tag em, .tag .sep { font-style: normal; color: var(--accent); }

.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.lede { font-size: clamp(17px, 1.9vw, 20px); line-height: 1.55; color: var(--fg-body); max-width: 58ch; }

/* ---- chrome ---- */
header.nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(20, 20, 20, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.nav-in { display: flex; align-items: center; gap: 26px; height: 58px; }
.brand { font-family: var(--mono); font-size: 14px; color: var(--fg); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
.nav a.link {
  font-size: 13.5px; color: var(--fg-tertiary); text-decoration: none;
  transition: color 0.15s var(--ease);
}
.nav a.link:hover { color: var(--fg); }
.nav a.link[aria-current="page"] {
  color: var(--fg);
  font-weight: 500;
  box-shadow: inset 0 -1px 0 0 var(--accent);
}
.nav .sp { flex: 1; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13.5px; font-weight: 500; padding: 8px 15px; border-radius: 6px;
  text-decoration: none; border: 1px solid var(--line); color: var(--fg-strong);
  background: var(--surface); transition: all 0.15s var(--ease);
}
.btn:hover { background: var(--surface-strong); border-color: var(--line-strong); color: var(--fg); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #171009; font-weight: 600; }
.btn.primary:hover { background: #eb9757; border-color: #eb9757; }

/* ---- sections ---- */
section { padding: clamp(56px, 9vw, 104px) 0; border-top: 1px solid var(--line-soft); }
section:first-of-type { border-top: 0; }
.sec-head { display: flex; flex-direction: column; gap: 12px; margin-bottom: 34px; }

/* ---- surfaces ---- */
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 10px; padding: 22px;
}
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.g4 { grid-template-columns: repeat(auto-fit, minmax(165px, 1fr)); }

/* ---- stat ---- */
.stat .k { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; color: var(--fg-tertiary); text-transform: uppercase; }
.stat .v { font-family: var(--mono); font-size: clamp(22px, 2.6vw, 30px); color: var(--fg); font-variant-numeric: tabular-nums; margin-top: 5px; letter-spacing: -0.02em; }
.stat .n { font-size: 12.5px; color: var(--fg-tertiary); margin-top: 5px; line-height: 1.45; }

/* ---- data table ---- */
.scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { padding: 11px 16px; text-align: left; border-bottom: 1px solid var(--line-soft); }
thead th { font-family: var(--mono); font-size: 10.5px; font-weight: 500; letter-spacing: 0.07em; text-transform: uppercase; color: var(--fg-tertiary); white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
td.name { font-family: var(--mono); font-size: 13px; color: var(--fg-strong); }
.pos { color: var(--positive); } .neg { color: var(--negative); } .wrn { color: var(--warn); } .inf { color: var(--info); }

/* ---- visual frame: every diagram sits in one of these ---- */
.viz {
  border: 1px solid var(--line); border-radius: 12px; background: var(--bg-lift);
  overflow: hidden;
}
.viz-head { display: flex; justify-content: space-between; align-items: center; gap: 14px; padding: 12px 16px; border-bottom: 1px solid var(--line-soft); flex-wrap: wrap; }
.viz-body { padding: 18px 16px; }
.viz canvas { display: block; width: 100%; height: auto; }
.viz figcaption { padding: 12px 16px 16px; font-size: 12.5px; color: var(--fg-tertiary); line-height: 1.5; border-top: 1px solid var(--line-soft); }

/* ---- footer ---- */
footer { border-top: 1px solid var(--line-soft); padding: 40px 0 64px; color: var(--fg-tertiary); font-size: 13px; }
footer a { color: var(--fg-tertiary); }
.foot-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 26px; }
.foot-grid .foot-h { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--fg-quaternary); margin: 0 0 10px; font-weight: 500; }
.foot-grid a { display: block; text-decoration: none; padding: 3px 0; }
.foot-grid a:hover { color: var(--fg); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }
.btn.primary:focus-visible { outline-color: var(--fg); }

/* Scrollable panes must be reachable by keyboard. */
.scroll:focus-visible { outline-offset: 0; }

/* ---- reveal ----
   Visible by default. The script adds `js` to <html>, and only then does .rise start
   hidden. A page that forgets the script, or a reader with JS off, gets the content —
   never a blank box where the evidence should be. */
.rise { transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
html.js .rise { opacity: 0; transform: translateY(14px); }
html.js .rise.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html.js .rise { opacity: 1; transform: none; transition: none; }
}

/* ---- narrow screens ----
   The nav's six links plus a button overflow a 390px viewport and pushed every page
   140px sideways. Wrapping is enough; a drawer would be more chrome than this needs. */
@media (max-width: 760px) {
  .nav-in { height: auto; padding: 11px 0 12px; flex-wrap: wrap; gap: 10px 18px; }
  .nav-in .brand { flex: 0 0 100%; }
  .nav-in .sp, .nav-in .btn { display: none; }
  .nav a.link { font-size: 13px; }
  h1 { font-size: clamp(30px, 8vw, 40px); }
  .viz-head { gap: 8px; }
}

/* Long unbroken monospace strings (addresses, signatures) must scroll inside their own
   box rather than widening the document. */
pre, code { overflow-wrap: anywhere; }