/* Terabeat site. Tokens follow the Loop Stage (docs/LOOP_STAGE_UI.md,
   lib/stage/theme/stage_theme.dart). */

@font-face { font-family: "Michroma"; src: url("fonts/Michroma-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Space Grotesk"; src: url("fonts/SpaceGrotesk-Variable.ttf") format("truetype"); font-weight: 300 700; font-display: swap; }
@font-face { font-family: "Martian Mono"; src: url("fonts/MartianMono-Variable.ttf") format("truetype"); font-weight: 100 800; font-display: swap; }

:root {
  --ground: #05060A;
  --surface: #0A0C14;
  --well: #080A12;
  --line: #1E2438;
  --line-soft: #1A1F33;
  --text: #E8ECFF;
  --muted: #8A93B8;
  --dim: #3A4160;
  --cyan: #3BE8FF;
  --violet: #A38BFF;
  --lime: #C6FF4A;
  --coral: #FF4D6D;
  --display: "Michroma", "Space Grotesk", system-ui, sans-serif;
  --ui: "Space Grotesk", system-ui, sans-serif;
  --mono: "Martian Mono", ui-monospace, Menlo, monospace;
  --gutter: 16px;
  --max: 1040px;
}

* { box-sizing: border-box; }
html { color-scheme: dark; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--text);
  font-family: var(--ui);
  font-size: 17px;
  line-height: 1.55;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -1;
  background-image:
    linear-gradient(to right, rgba(30,36,56,.28) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30,36,56,.28) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.narrow { max-width: 720px; }

/* Header */
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 0; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); font-family: var(--display); font-size: 15px; letter-spacing: .18em; text-transform: uppercase; }
.brand:hover { text-decoration: none; }
.brand svg { width: 28px; height: 28px; }
.nav { display: flex; gap: 22px; font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; }
.nav a { color: var(--muted); }
.nav a[aria-current="page"], .nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero { display: grid; grid-template-columns: 1fr; gap: 36px; align-items: center; padding: 28px 0 56px; }
@media (min-width: 820px) { .hero { grid-template-columns: 1.1fr 1fr; padding: 56px 0 80px; } }
.kicker { font-family: var(--mono); font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); margin: 0 0 18px; }
.kicker b { color: var(--coral); font-weight: 600; }
h1 { font-family: var(--display); font-weight: 400; font-size: clamp(28px, 5.6vw, 46px); line-height: 1.12; letter-spacing: .01em; margin: 0 0 20px; }
h1 em { font-style: normal; color: var(--cyan); }
.lede { font-size: 19px; color: var(--muted); max-width: 46ch; margin: 0 0 28px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 18px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--surface);
  color: var(--text); font-family: var(--mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase;
}
.btn:hover { text-decoration: none; border-color: var(--cyan); box-shadow: 0 0 18px rgba(59,232,255,.18); }
.btn.soon { color: var(--muted); cursor: default; }
.btn.soon:hover { border-color: var(--line); box-shadow: none; }
.btn.soon small { font-size: 10px; color: var(--dim); letter-spacing: .1em; }

/* Loop core */
.core { position: relative; width: min(100%, 360px); aspect-ratio: 1; margin: 0 auto; }
.core svg { width: 100%; height: 100%; display: block; overflow: visible; }
.core .sweep { transform-origin: 50% 50%; animation: sweep 4s linear infinite; }
@keyframes sweep { to { transform: rotate(360deg); } }
.core .pulse { animation: pulse 2s ease-in-out infinite; transform-origin: 50% 50%; }
@keyframes pulse { 0%, 100% { opacity: .55; } 50% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .core .sweep, .core .pulse { animation: none; } }

/* Feature cards */
.features { display: grid; grid-template-columns: 1fr; gap: 14px; padding: 0 0 64px; }
@media (min-width: 720px) { .features { grid-template-columns: repeat(3, 1fr); } }
.card {
  background: linear-gradient(180deg, #10131F, var(--surface));
  border: 1px solid var(--line); border-radius: 16px; padding: 22px 20px;
  position: relative; overflow: hidden;
}
.card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--accent, var(--cyan)); box-shadow: 0 0 16px var(--accent, var(--cyan)); }
.card h3 { font-family: var(--mono); font-weight: 600; font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--accent, var(--cyan)); margin: 0 0 10px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.card.pads { --accent: var(--cyan); }
.card.keys { --accent: var(--violet); }
.card.fx   { --accent: var(--lime); }

/* Spec strip */
.specs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: 14px; overflow: hidden; margin-bottom: 72px; }
@media (min-width: 720px) { .specs { grid-template-columns: repeat(4, 1fr); } }
.spec { background: var(--well); padding: 18px 16px; }
.spec b { display: block; font-family: var(--display); font-size: 20px; font-weight: 400; margin-bottom: 4px; }
.spec span { font-family: var(--mono); font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }

/* Prose pages */
.page { padding: 12px 0 72px; }
.page h1 { font-size: clamp(24px, 4.5vw, 34px); margin-bottom: 8px; }
.page .meta { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin: 0 0 36px; }
.page h2 { font-family: var(--mono); font-weight: 600; font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--cyan); margin: 40px 0 12px; padding-top: 18px; border-top: 1px solid var(--line-soft); }
.page h3 { font-family: var(--ui); font-weight: 600; font-size: 17px; margin: 22px 0 6px; }
.page p, .page li { color: #C3C9E6; }
.page ul { padding-left: 20px; }
.page li { margin: 6px 0; }
.page table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 12px 0 8px; }
.page th, .page td { text-align: left; vertical-align: top; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line-soft); }
.page th { font-family: var(--mono); font-weight: 600; font-size: 10px; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.page code { font-family: var(--mono); font-size: 13px; color: var(--text); background: var(--surface); border: 1px solid var(--line-soft); border-radius: 6px; padding: 1px 6px; }
.callout { border: 1px solid var(--line); border-left: 3px solid var(--lime); border-radius: 12px; background: var(--surface); padding: 16px 18px; margin: 20px 0; }
.callout p { margin: 0; }
details { border: 1px solid var(--line-soft); border-radius: 12px; background: var(--surface); padding: 0 18px; margin: 10px 0; }
details summary { cursor: pointer; padding: 14px 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; font-family: var(--mono); color: var(--muted); }
details[open] summary::after { content: "−"; }
details p { margin: 0 0 16px; }

/* Footer */
.foot { border-top: 1px solid var(--line-soft); padding: 26px 0 40px; display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: center; justify-content: space-between; font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.foot a { color: var(--muted); }
.foot a:hover { color: var(--text); }
.foot nav { display: flex; flex-wrap: wrap; gap: 18px; }