:root {
  --bg: #000000;
  --surface: #0d0d0d;
  --line: #222222;
  --text: #f0f0f0;
  --muted: #9a9a9a;
  /* Set from the selected theme by main.js. */
  --accent: #ffffff;
  --accent-dim: #3c3c3c;
  --sans: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Cascadia Code", Consolas, ui-monospace, monospace;
}

* { 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(--text);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.4s;
}

a { color: inherit; }
code { font-family: var(--mono); font-size: 0.92em; color: var(--accent); }

/* Navigation */
.nav {
  position: absolute;
  inset: 0 0 auto 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  background: linear-gradient(var(--bg), transparent);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; letter-spacing: 0.02em; }
.brand img { filter: invert(1); }
.nav nav { display: flex; gap: 22px; font-size: 14px; }
.nav nav a { text-decoration: none; color: var(--muted); transition: color 0.2s; }
.nav nav a:hover { color: var(--text); }

/* Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  place-items: center;
  overflow: hidden;
}
#terrain { position: absolute; inset: 0; width: 100%; height: 100%; }

.mark {
  position: relative;
  /* Matches the box the terrain warps around (see main.js). */
  width: min(540px, calc(100vw - 32px));
  height: min(190px, calc((100vw - 32px) * 0.36));
  display: grid;
  place-content: center;
  text-align: center;
  margin-bottom: 18vh;
}
.corner { position: absolute; width: 22px; height: 22px; border-color: var(--accent-dim); border-style: solid; border-width: 0; }
.tl { left: 10%; top: 11%; border-left-width: 1.5px; border-top-width: 1.5px; }
.tr { right: 10%; top: 11%; border-right-width: 1.5px; border-top-width: 1.5px; }
.bl { left: 10%; bottom: 11%; border-left-width: 1.5px; border-bottom-width: 1.5px; }
.br { right: 10%; bottom: 11%; border-right-width: 1.5px; border-bottom-width: 1.5px; }
.mark { grid-auto-flow: column; align-items: center; gap: 0.3em; font-size: clamp(34px, 8vw, 68px); }
/* Sized in em so the logo stays as tall as the wordmark's capitals at every width. */
.logo { width: 0.74em; height: auto; color: var(--accent); }
.wordmark { margin: 0; font-weight: 600; font-size: 1em; line-height: 1; letter-spacing: -0.01em; }

.hero-copy {
  position: absolute;
  inset: auto 0 0 0;
  padding: 0 24px 56px;
  text-align: center;
  background: linear-gradient(transparent, var(--bg) 55%);
}
.hero-copy h1 { margin: 0 0 8px; font-size: clamp(26px, 4vw, 40px); font-weight: 600; letter-spacing: -0.01em; }
.hero-copy p { margin: 0 auto; max-width: 560px; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin: 24px 0 12px; }
.button {
  display: inline-block;
  padding: 11px 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: border-color 0.2s, background-color 0.2s, color 0.2s;
}
.button:hover { border-color: var(--muted); }
.button.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.button.primary:hover { filter: brightness(1.1); }
.button:focus-visible, .swatch:focus-visible, .nav a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.fine { font-size: 13px; }

/* Sections */
.section { max-width: 1040px; margin: 0 auto; padding: 88px 24px 0; }
.section h2 { margin: 0 0 28px; font-size: clamp(24px, 3vw, 32px); font-weight: 600; letter-spacing: -0.01em; }
.lede { margin: -16px 0 28px; color: var(--muted); }
h3 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.features article { padding: 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.features p, .groups p, .steps p { margin: 0; color: var(--muted); font-size: 15px; }

.groups { display: grid; gap: 0; border-top: 1px solid var(--line); }
.groups > div { display: grid; grid-template-columns: 140px 1fr; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.groups h3 { margin: 0; font-family: var(--mono); font-weight: 400; font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); padding-top: 2px; }

.swatches { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.swatch {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: #f0f0f0;
  font: inherit;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s;
}
.swatch:hover { transform: translateY(-1px); border-color: var(--muted); }
.swatch[aria-pressed="true"] { border-color: var(--accent); }
.swatch .bar { height: 14px; border-radius: 4px; }

.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.steps li { display: flex; gap: 18px; padding: 20px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.steps li > span {
  flex: none;
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border: 1px solid var(--accent-dim);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
}

.footer {
  max-width: 1040px;
  margin: 88px auto 0;
  padding: 28px 24px 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 12px 24px; }
.footer-links span { margin-right: auto; }
.footer a { text-decoration: none; }
.footer a:hover { color: var(--text); }
.trademarks { margin: 16px 0 0; max-width: 720px; font-size: 12px; line-height: 1.5; opacity: 0.8; }

/* Legal pages */
.legal { max-width: 720px; margin: 0 auto; padding: 112px 24px 0; }
.legal h1 { margin: 0 0 4px; font-size: clamp(28px, 4vw, 36px); font-weight: 600; letter-spacing: -0.01em; }
.legal .updated { margin: 0 0 36px; color: var(--muted); font-size: 14px; }
.legal h2 { margin: 36px 0 10px; font-size: 19px; font-weight: 600; }
.legal p, .legal li { color: #cfcfcf; }
.legal ul { padding-left: 22px; }
.legal li + li { margin-top: 6px; }
.legal a { color: var(--accent); }

@media (max-width: 640px) {
  .nav { padding: 12px 16px; }
  .nav nav { gap: 14px; }
  .nav nav a:not(:last-child) { display: none; }
  .section { padding: 64px 16px 0; }
  .hero-copy { padding: 0 16px 40px; }
  .mark { margin-bottom: 30vh; }
  .groups > div { grid-template-columns: 1fr; gap: 4px; }
  .footer { padding: 24px 16px 32px; }
  .legal { padding: 88px 16px 0; }
}