:root {
  color-scheme: dark;
  --bg: #081016;
  --ink: #edf8f4;
  --muted: #9bb0ae;
  --panel: #121d22;
  --panel2: #18272d;
  --line: #2a4148;
  --accent: #73f0c2;
  --gold: #ffc857;
  --danger: #ff6b6b;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  font: 15px/1.35 Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 50% 0%, rgba(115, 240, 194, 0.14), transparent 34rem),
    linear-gradient(180deg, #09161a 0%, #070b10 100%);
}

button {
  border: 1px solid var(--line);
  background: #17262c;
  color: var(--ink);
  min-height: 44px;
  border-radius: 8px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}
button:hover { border-color: var(--accent); }

.shell {
  width: min(1180px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 18px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  align-items: start;
}

.stage, .ledger {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(18, 29, 34, 0.92);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

.stage { padding: 16px; }
.brand-row, .panel-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}
h1, h2 { margin: 0; letter-spacing: 0; }
h1 { font-size: clamp(32px, 7vw, 72px); line-height: 0.95; }
h2 { font-size: 20px; }
p { margin: 0; color: var(--muted); }
.icon-button { width: 48px; font-size: 22px; }

.hud {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 14px 0;
}
.hud div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel2);
  padding: 10px;
}
.hud span, .preview span, .panel-title span { display: block; color: var(--muted); font-size: 12px; text-transform: uppercase; }
.hud strong { display: block; font-size: 23px; margin-top: 2px; }

.play-wrap {
  display: grid;
  grid-template-columns: minmax(280px, 520px) minmax(180px, 1fr);
  gap: 14px;
  align-items: stretch;
}

.board {
  --gap: 6px;
  aspect-ratio: 6 / 12;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-template-rows: repeat(12, 1fr);
  gap: var(--gap);
  width: min(100%, 520px);
  padding: var(--gap);
  border-radius: 8px;
  border: 1px solid #39545d;
  background: linear-gradient(180deg, #0a1218, #101d24);
  outline: none;
}
.board:focus { border-color: var(--accent); }

.cell {
  min-width: 0;
  min-height: 0;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.045);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.04);
}
.shard {
  box-shadow: inset 0 -12px 20px rgba(0,0,0,0.25), inset 0 0 0 1px rgba(255,255,255,0.16), 0 4px 22px rgba(0,0,0,0.24);
}
.active { outline: 2px solid rgba(255,255,255,0.38); }
.plasma { background: linear-gradient(145deg, #ff6b6b, #9d2140); }
.crystal { background: linear-gradient(145deg, #73f0c2, #147b71); }
.ore { background: linear-gradient(145deg, #ffc857, #9a621a); }
.spark { background: linear-gradient(145deg, #8cb6ff, #2c54aa); }
.void { background: linear-gradient(145deg, #d99cff, #663c9a); }

.side {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: 12px;
}
.preview, .mission, .status, .mini-help {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0d171c;
  padding: 12px;
}
.next-piece {
  width: 58px;
  display: grid;
  gap: 6px;
  margin-top: 10px;
}
.next-piece .cell { width: 58px; height: 58px; }
.mission { color: #d9eee8; font-weight: 800; }
.status { color: var(--gold); }
.primary { background: linear-gradient(180deg, #54dfae, #219173); color: #03110d; border-color: #74e9c0; }

.controls {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 12px;
}
.controls button { font-size: 22px; }

.ledger { padding: 16px; }
.leaderboard {
  list-style: none;
  padding: 0;
  margin: 14px 0;
  display: grid;
  gap: 8px;
}
.leaderboard li {
  display: grid;
  grid-template-columns: 86px 1fr;
  gap: 10px;
  align-items: center;
  padding: 10px;
  border-radius: 8px;
  background: var(--panel2);
  border: 1px solid var(--line);
}
.leaderboard span { color: var(--muted); overflow-wrap: anywhere; }
.mini-help { display: grid; gap: 8px; }

.flash .stage { border-color: var(--accent); }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; padding: 10px; }
  .play-wrap { grid-template-columns: 1fr; }
  .side { grid-template-columns: 1fr 1fr; grid-template-rows: auto auto; }
  .primary { grid-column: span 2; }
  .hud { grid-template-columns: repeat(2, 1fr); }
  .board { width: 100%; max-height: 66vh; justify-self: center; }
}

@media (max-width: 480px) {
  .stage, .ledger { padding: 10px; }
  .side { grid-template-columns: 1fr; }
  .primary { grid-column: auto; }
  .next-piece { grid-template-columns: repeat(3, 42px); width: auto; }
  .next-piece .cell { width: 42px; height: 42px; }
  .hud strong { font-size: 20px; }
}