:root {
  --bg: #08111f;
  --panel: #111c2d;
  --panel-strong: #16243a;
  --panel-soft: #0d1726;
  --accent: #38bdf8;
  --accent-dark: #0ea5e9;
  --gold: #fbbf24;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --light-square: #f8fafc;
  --dark-square: #38bdf8;
  --danger: #f87171;
  --success: #4ade80;
  --border: rgba(148, 163, 184, 0.22);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background:
    radial-gradient(circle at top, rgba(56, 189, 248, 0.15), transparent 32%),
    linear-gradient(180deg, #07101d 0%, #0f172a 100%);
  color: var(--text);
  min-height: 100vh;
}

header {
  padding: 1.5rem 1rem 1rem;
  text-align: center;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 2rem;
}

header p {
  margin: 0;
  color: var(--muted);
}

main {
  display: grid;
  grid-template-columns: minmax(260px, 300px) minmax(320px, 1.1fr) minmax(320px, 520px);
  gap: 1.5rem;
  align-items: start;
  padding: 1rem;
  max-width: 1500px;
  margin: 0 auto;
}

.panel {
  background: linear-gradient(180deg, rgba(22, 36, 58, 0.96), rgba(9, 16, 29, 0.96));
  border: 1px solid var(--border);
  box-shadow: 0 16px 40px rgba(8, 15, 28, 0.35);
  border-radius: 1rem;
  padding: 1rem 1.25rem;
  min-width: 0;
}

.panel h2,
.panel h3,
.panel h4 {
  margin: 0;
}

.eyebrow,
.lobby-card-kicker {
  margin: 0 0 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gold);
  font-size: 0.72rem;
}

button,
input,
select {
  font: inherit;
}

button {
  background: var(--accent);
  color: #0f172a;
  border: none;
  border-radius: 0.65rem;
  padding: 0.6rem 1rem;
  font-weight: 700;
  cursor: pointer;
}

button:hover:not(:disabled) {
  background: var(--accent-dark);
}

button:disabled {
  background: #475569;
  color: var(--muted);
  cursor: not-allowed;
}

.secondary-button {
  background: rgba(56, 189, 248, 0.14);
  color: var(--text);
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.secondary-button:hover:not(:disabled) {
  background: rgba(56, 189, 248, 0.24);
}

.status-row,
.section-copy,
.card-copy,
.bracket-copy {
  margin: 0.5rem 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.warning {
  color: var(--danger);
  font-size: 0.9rem;
}

.token-address {
  font-family: monospace;
  font-size: 0.8rem;
  word-break: break-all;
  color: var(--muted);
}

.error-text {
  color: var(--danger);
}

.lobby-panel {
  display: grid;
  gap: 1rem;
}

.lobby-header,
.game-panel-top,
.section-heading,
.lobby-card-top,
.bracket-match-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.lobby-badge,
.mode-pill,
.status-pill,
.chip,
.seat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.lobby-badge,
.mode-pill,
.chip,
.seat-pill {
  background: rgba(56, 189, 248, 0.14);
  color: var(--text);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.status-pill {
  background: rgba(148, 163, 184, 0.15);
  color: var(--text);
}

.status-pill.waiting,
.status-pill.registration,
.status-pill.idle {
  background: rgba(251, 191, 36, 0.14);
  color: #fde68a;
}

.status-pill.active,
.status-pill.running {
  background: rgba(74, 222, 128, 0.14);
  color: #bbf7d0;
}

.status-pill.complete {
  background: rgba(96, 165, 250, 0.14);
  color: #bfdbfe;
}

.stacked-label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
}

.input-row {
  display: flex;
  gap: 0.75rem;
}

.input-row input,
.ai-controls select {
  width: 100%;
  background: rgba(8, 17, 31, 0.9);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  padding: 0.65rem 0.8rem;
}

.lobby-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.lobby-section,
.stage-panel {
  background: rgba(8, 17, 31, 0.58);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 0.85rem;
  padding: 1rem;
}

.lobby-list,
.stage-shell {
  display: grid;
  gap: 0.75rem;
}

.lobby-card,
.bracket-match {
  background: linear-gradient(180deg, rgba(17, 28, 45, 0.95), rgba(8, 17, 31, 0.95));
  border: 1px solid rgba(148, 163, 184, 0.14);
  border-radius: 0.9rem;
  padding: 0.9rem;
}

.chip-row,
.board-actions,
.seat-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.empty-state {
  border: 1px dashed rgba(148, 163, 184, 0.25);
  border-radius: 0.8rem;
  padding: 1rem;
  color: var(--muted);
  text-align: center;
}

.bracket-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.bracket-round {
  display: grid;
  gap: 0.75rem;
}

.bracket-heading {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
}

.bracket-player {
  padding: 0.45rem 0.6rem;
  border-radius: 0.65rem;
  background: rgba(56, 189, 248, 0.07);
  margin-top: 0.45rem;
}

.bracket-player.winner,
.seat-pill.current-player,
.bracket-match.active {
  border: 1px solid rgba(74, 222, 128, 0.5);
  box-shadow: inset 0 0 0 1px rgba(74, 222, 128, 0.2);
}

.game-panel {
  max-width: 100%;
}

.ai-controls {
  margin: 1rem 0 0.5rem;
  display: grid;
  gap: 0.45rem;
}

.ai-controls label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.controls-disabled {
  opacity: 0.55;
}

#board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  width: min(100%, 520px);
  aspect-ratio: 1 / 1;
  margin: 1rem auto 0;
  border: 4px solid rgba(8, 17, 31, 0.8);
  border-radius: 0.75rem;
  overflow: hidden;
}

#board.board-disabled {
  opacity: 0.82;
}

.square {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  font-size: min(6vw, 2.5rem);
  user-select: none;
  cursor: pointer;
}

.square.light {
  background: var(--light-square);
}

.square.dark {
  background: var(--dark-square);
}

.square.selected {
  outline: 3px solid var(--accent);
  outline-offset: -3px;
}

.square.legal-target::after {
  content: '';
  position: absolute;
  width: 30%;
  height: 30%;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.6);
}

.piece.in-check {
  filter: drop-shadow(0 0 4px var(--danger));
}

.piece.white-piece {
  color: black;
  -webkit-text-fill-color: black;
}

.piece.black-piece {
  color: #fef08a;
  -webkit-text-fill-color: #fef08a;
}

#claim-status {
  min-height: 1.2em;
  color: var(--success);
  font-size: 0.9rem;
}

footer {
  text-align: center;
  color: var(--muted);
  padding: 1.5rem 1rem 2rem;
  font-size: 0.85rem;
}

footer a {
  color: var(--accent);
}

@media (max-width: 1200px) {
  main {
    grid-template-columns: minmax(260px, 320px) minmax(320px, 1fr);
  }

  .game-panel {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  main {
    grid-template-columns: 1fr;
  }

  .lobby-grid,
  .bracket-grid {
    grid-template-columns: 1fr;
  }

  .input-row,
  .board-actions {
    flex-direction: column;
  }

  #board {
    width: min(92vw, 520px);
  }
}