/* Base reset */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji; line-height: 1.5; }

/* Theme tokens */
:root {
  --bg: #fafafa;
  --fg: #0a0a0a;
  --muted: #5a5a5a;
  --border: #e5e5e5;
  --card: rgba(255,255,255,0.7);

  --dot-gap: 18px;           /* dot spacing */
  --dot-size: 1px;           /* dot size */
  --dot-color: rgba(0,0,0,0.12);
  --grid-gap: 96px;          /* grid spacing */
  --grid-color: rgba(0,0,0,0.06);
  --axis-color: rgba(0,0,0,0.16);
}
.dark {
  --bg: #0a0a0a;
  --fg: #f3f3f3;
  --muted: #b1b1b1;
  --border: #1e1e1e;
  --card: rgba(255,255,255,0.03);

  --dot-color: rgba(255,255,255,0.14);
  --grid-color: rgba(255,255,255,0.09);
  --axis-color: rgba(255,255,255,0.22);
}

body {
  color: var(--fg);
  background-color: var(--bg);
  /* dotted lab-paper background + grid lines */
  background-image:
    radial-gradient(var(--dot-color) var(--dot-size), transparent var(--dot-size)),
    linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);
  background-size:
    var(--dot-gap) var(--dot-gap),
    var(--grid-gap) var(--grid-gap),
    var(--grid-gap) var(--grid-gap);
  background-attachment: fixed, fixed, fixed;
  background-position: 0 0, 0 0, 0 0;
}

.container { max-width: 1120px; margin: 0 auto; padding: 24px; }

header { position: sticky; top: 0; z-index: 10; backdrop-filter: saturate(180%) blur(6px); background: color-mix(in oklab, var(--bg) 90%, transparent); border-bottom: 1px solid var(--border); }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 600; letter-spacing: 0.02em; }
.brand img { height: 22px; }

nav { display: flex; align-items: center; gap: 24px; }

/* Toggle switch */
.toggle {
  --h: 28px;
  --w: 52px;
  width: var(--w);
  height: var(--h);
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  transition: background .25s ease, border-color .25s ease;
}
.toggle .knob {
  position: absolute; top: 2px; left: 2px;
  width: calc(var(--h) - 4px); height: calc(var(--h) - 4px);
  border-radius: 999px;
  background: var(--fg);
  transition: transform .25s ease;
}
html.dark .toggle .knob { transform: translateX(calc(var(--w) - var(--h))); }

main { padding-top: 48px; }

.hero { padding: 72px 0 40px; display: grid; gap: 16px; }
.kicker { color: var(--muted); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; }
.headline { font-size: clamp(32px, 6vw, 56px); line-height: 1.05; font-weight: 650; letter-spacing: -0.01em; }
.sub { max-width: 64ch; color: var(--muted); font-size: 16px; }

.grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; }
.card {
  grid-column: span 4;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease;
}
.card:hover { transform: translateY(-2px); border-color: color-mix(in oklab, var(--fg) 12%, var(--border)); }
.card h3 { margin: 0 0 6px; font-size: 16px; letter-spacing: 0.01em; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

.section { padding: 48px 0; border-top: 1px solid var(--border); }
.list { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px 20px; margin-top: 10px; }
.list li { color: var(--muted); }

.axis {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
}
.axis .h, .axis .v {
  position: absolute;
  background: var(--axis-color);
}
.axis .h { height: 1px; left: 0; right: 0; top: 50%; }
.axis .v { width: 1px; top: 0; bottom: 0; left: 50%; }

footer { padding: 40px 0 60px; color: var(--muted); font-size: 13px; }

/* fade-in animation */
.reveal { opacity: 0; transform: translateY(8px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-in { opacity: 1; transform: translateY(0); }

@media (max-width: 900px) {
  .card { grid-column: span 6; }
  .list { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .card { grid-column: span 12; }
  header .container { padding: 14px 18px; }
  .container { padding: 18px; }
}