:root {
  --bg: oklch(98% 0.005 250);
  --surface: oklch(100% 0 0);
  --fg: oklch(22% 0.02 240);
  --muted: oklch(50% 0.018 240);
  --border: oklch(90% 0.008 240);
  --accent: oklch(58% 0.16 145);

  --font-display: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, Menlo, monospace;

  --cell-a: oklch(58% 0.16 145);
  --cell-b: oklch(72% 0.14 170);
  --cell-glow: color-mix(in oklch, var(--cell-a), white 38%);
  --grid: color-mix(in oklch, var(--border), var(--fg) 8%);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 16% 12%, color-mix(in oklch, var(--accent), transparent 84%), transparent 30rem),
    linear-gradient(135deg, color-mix(in oklch, var(--bg), white 60%), var(--bg));
  color: var(--fg);
  font-family: var(--font-body);
  font-variant-numeric: tabular-nums;
}

button, input { font: inherit; }

.page {
  width: min(1440px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: color-mix(in oklch, var(--surface), transparent 12%);
  box-shadow: 0 18px 50px color-mix(in oklch, var(--fg), transparent 92%);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid color-mix(in oklch, var(--accent), var(--border) 45%);
  border-radius: 13px;
  background: color-mix(in oklch, var(--accent), white 86%);
  color: var(--fg);
  font-family: var(--font-mono);
  font-weight: 800;
  box-shadow: 0 0 0 5px color-mix(in oklch, var(--accent), transparent 88%);
}

.brand strong {
  display: block;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: -0.02em;
}

.brand span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 2px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: nowrap;
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 5px color-mix(in oklch, var(--accent), transparent 82%);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(390px, 1.35fr);
  gap: 22px;
  align-items: stretch;
  margin-top: 22px;
}

.intro,
.lab-card,
.panel,
.prompt-card {
  border: 1px solid var(--border);
  border-radius: 22px;
  background: color-mix(in oklch, var(--surface), transparent 4%);
  box-shadow: 0 24px 60px color-mix(in oklch, var(--fg), transparent 93%);
}

.intro {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 580px;
  padding: clamp(24px, 4vw, 42px);
  overflow: hidden;
  position: relative;
}

.intro::after {
  content: "";
  position: absolute;
  inset-inline-end: -110px;
  inset-block-end: -120px;
  width: 290px;
  height: 290px;
  border: 1px dashed color-mix(in oklch, var(--accent), transparent 40%);
  border-radius: 50%;
  opacity: 0.55;
}

.eyebrow {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid color-mix(in oklch, var(--accent), var(--border) 45%);
  border-radius: 999px;
  color: color-mix(in oklch, var(--accent), var(--fg) 18%);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1 {
  max-width: 780px;
  margin: 24px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(42px, 7vw, 86px);
  line-height: 0.96;
  letter-spacing: -0.045em;
}

.lede {
  max-width: 54ch;
  margin: 0;
  color: var(--muted);
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.55;
  text-wrap: pretty;
}

.rules {
  display: grid;
  gap: 10px;
  margin-top: 32px;
  padding: 0;
  list-style: none;
  color: var(--fg);
  position: relative;
  z-index: 1;
}

.rules li {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: color-mix(in oklch, var(--bg), var(--surface) 48%);
}

.rules b {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: color-mix(in oklch, var(--accent), white 84%);
  color: color-mix(in oklch, var(--accent), black 30%);
  font-family: var(--font-mono);
  font-size: 13px;
}

.rules span {
  color: var(--muted);
  line-height: 1.45;
}

.lab-card {
  padding: clamp(14px, 2vw, 22px);
  min-width: 0;
}

.board-shell {
  display: grid;
  gap: 14px;
  height: 100%;
}

.board-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.board-title {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
  font-family: var(--font-mono);
}

.canvas-wrap {
  display: grid;
  place-items: center;
  min-height: 450px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background:
    linear-gradient(90deg, color-mix(in oklch, var(--grid), transparent 45%) 1px, transparent 1px),
    linear-gradient(color-mix(in oklch, var(--grid), transparent 45%) 1px, transparent 1px),
    color-mix(in oklch, var(--surface), var(--bg) 34%);
  background-size: 28px 28px;
  overflow: hidden;
  position: relative;
}

.canvas-wrap::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px dashed color-mix(in oklch, var(--accent), transparent 70%);
  border-radius: 14px;
  pointer-events: none;
}

canvas {
  width: min(100%, 820px);
  height: auto;
  max-height: 70vh;
  aspect-ratio: 1.333;
  border-radius: 14px;
  background: color-mix(in oklch, var(--surface), var(--bg) 26%);
  cursor: crosshair;
  touch-action: none;
}

.caption {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.dashboard {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 22px;
  margin-top: 22px;
  align-items: start;
}

.panel {
  padding: 18px;
}

.panel h2,
.prompt-card h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 2.4vw, 34px);
  line-height: 1.06;
  letter-spacing: -0.03em;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.button {
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--fg);
  font-weight: 750;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover { transform: translateY(-1px); border-color: color-mix(in oklch, var(--accent), var(--border) 40%); }
.button:active { transform: translateY(0); }

.button.primary {
  background: color-mix(in oklch, var(--accent), white 82%);
  border-color: color-mix(in oklch, var(--accent), var(--border) 22%);
  color: color-mix(in oklch, var(--fg), var(--accent) 22%);
}

.theme-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.theme {
  min-height: 76px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  cursor: pointer;
  text-align: start;
}

.theme[aria-pressed="true"] {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.swatches {
  display: flex;
  gap: 5px;
  margin-bottom: 9px;
}

.swatches i {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  border: 1px solid color-mix(in oklch, var(--border), var(--fg) 12%);
}

.swatch-sprout-a { background: oklch(58% 0.16 145); }
.swatch-sprout-b { background: oklch(72% 0.14 170); }
.swatch-nebula-a { background: oklch(60% 0.18 285); }
.swatch-nebula-b { background: oklch(70% 0.14 235); }
.swatch-sunny-a { background: oklch(70% 0.15 65); }
.swatch-sunny-b { background: oklch(74% 0.12 35); }

.theme strong { display: block; font-size: 13px; }
.theme span { display: block; color: var(--muted); font-size: 12px; margin-top: 3px; }

.slider-row {
  display: grid;
  gap: 10px;
  margin-top: 16px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in oklch, var(--bg), var(--surface) 56%);
}

.slider-row label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.stat {
  min-height: 98px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat strong {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 40px);
  line-height: 1;
  letter-spacing: -0.04em;
}

.prompt-card {
  margin-top: 10px;
  padding: 18px;
}

.prompt-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 14px 0 0;
  list-style: none;
}

.prompt-list li {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in oklch, var(--bg), white 50%);
  color: var(--muted);
  line-height: 1.5;
}

.prompt-list strong {
  color: var(--fg);
}

.explain {
  margin: 14px 0 0;
  padding: 14px;
  border-inline-start: 4px solid var(--accent);
  border-radius: 12px;
  background: color-mix(in oklch, var(--accent), white 90%);
  color: color-mix(in oklch, var(--fg), var(--accent) 15%);
  line-height: 1.5;
}

@media (max-width: 1020px) {
  .hero,
  .dashboard { grid-template-columns: 1fr; }
  .intro { min-height: auto; }
  .canvas-wrap { min-height: 360px; }
}

@media (max-width: 680px) {
  .page { width: min(100% - 20px, 1440px); padding-top: 10px; }
  .topbar { align-items: flex-start; border-radius: 16px; }
  .status-pill { display: none; }
  .intro, .lab-card, .panel, .prompt-card { border-radius: 18px; }
  .control-grid, .theme-row, .stats-grid { grid-template-columns: 1fr; }
  .canvas-wrap { min-height: 260px; }
  h1 { font-size: clamp(38px, 13vw, 58px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; }
}