:root {
  color-scheme: light dark;
  --bg: #f4ead7;
  --surface: #fff9f0;
  --text: #2b1d12;
  --muted: #5e4f3e;
  --accent: #c45127;
  --accent-2: #3f7f34;
  --line: #d4b48f;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1f130e;
    --surface: #2a1a13;
    --text: #f6e5cc;
    --muted: #d7bc95;
    --accent: #ff7a3d;
    --accent-2: #7ec86d;
    --line: #5d3f2e;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Fraunces', serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(196, 81, 39, 0.25), transparent 40%),
    radial-gradient(circle at 80% 20%, rgba(63, 127, 52, 0.2), transparent 42%),
    var(--bg);
  min-height: 100vh;
}

.top-nav,
.hero,
main,
footer {
  width: min(1000px, 92vw);
  margin: 0 auto;
}

.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.top-nav a {
  text-decoration: none;
  color: var(--text);
  margin-left: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
}

.top-nav a:hover,
.top-nav a:focus-visible {
  color: var(--accent);
  outline: none;
}

.brand {
  margin-left: 0;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.5rem;
  letter-spacing: 0.06em;
}

.hero {
  padding: 3rem 0 2rem;
}

.eyebrow {
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

h1,
h2 {
  font-family: 'Bebas Neue', sans-serif;
  letter-spacing: 0.02em;
  margin: 0.2rem 0;
}

h1 {
  font-size: clamp(2.8rem, 8vw, 6rem);
  line-height: 0.95;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.subhead,
.muted,
footer {
  color: var(--muted);
}

.subhead {
  max-width: 62ch;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  font-size: 0.95rem;
}

main {
  display: grid;
  gap: 1.2rem;
  padding-bottom: 2rem;
}

.panel,
.arena > div,
.traits {
  border: 1px solid var(--line);
  background: color-mix(in oklab, var(--surface) 86%, transparent);
  border-radius: 18px;
  padding: 1rem;
  backdrop-filter: blur(4px);
}

.panel-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.cta {
  display: inline-block;
  margin-top: 0.6rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  color: var(--text);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.84rem;
  background: color-mix(in oklab, var(--surface) 93%, transparent);
}

.cta:hover,
.cta:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

.arena {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.unit-grid,
.board,
.synergy-list {
  display: grid;
  gap: 0.7rem;
}

.unit-grid {
  grid-template-columns: repeat(2, minmax(120px, 1fr));
}

.board {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  min-height: 70px;
}

.slot,
.unit,
.trait {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.65rem;
}

.slot {
  min-height: 66px;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--muted);
}

.unit,
.trait {
  background: color-mix(in oklab, var(--surface) 90%, transparent);
}

.unit {
  text-align: left;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease;
}

.unit:hover,
.unit:focus-visible {
  transform: translateY(-2px);
  border-color: var(--accent);
  outline: none;
}

.trait.active {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 1px color-mix(in oklab, var(--accent-2) 50%, transparent);
}

.depth-tabs,
.option-list {
  display: grid;
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.depth-tabs {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.depth-btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.55rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text);
  background: transparent;
  cursor: pointer;
}

.depth-btn.active {
  border-color: var(--accent);
  color: var(--accent);
}

.module-copy {
  margin: 0;
}

.option-btn {
  width: 100%;
}

.is-correct {
  border-color: var(--accent-2);
}

.is-wrong {
  border-color: var(--accent);
}

.next-btn {
  margin-top: 1rem;
}

.scorebar {
  margin-top: 0.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'JetBrains Mono', monospace;
}

#score {
  font-size: 1.4rem;
  color: var(--accent);
}

footer {
  font-size: 0.9rem;
  padding: 0 0 2rem;
}