/* ----- design tokens ----- */
:root {
  --bg-0: #06070d;
  --bg-1: #0a0d18;
  --bg-2: #111524;
  --panel: rgba(20, 24, 38, 0.65);
  --panel-strong: rgba(28, 33, 52, 0.85);
  --panel-border: rgba(120, 140, 200, 0.14);
  --panel-border-strong: rgba(140, 165, 230, 0.28);
  --grid: rgba(255, 255, 255, 0.04);
  --grid-strong: rgba(255, 255, 255, 0.08);
  --text: #e7ecff;
  --text-dim: #8b95b5;
  --text-faint: #59628a;
  --accent: #7aa6ff;
  --accent-2: #b87aff;
  --good: #5be7c4;
  --warn: #ffd166;
  --danger: #ff5d8f;

  --piece-I: #25e1ff;
  --piece-O: #ffd400;
  --piece-T: #c466ff;
  --piece-S: #4ce26b;
  --piece-Z: #ff4d6d;
  --piece-J: #4d7dff;
  --piece-L: #ff9b3d;

  --radius: 14px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: 'Rajdhani', 'Inter', system-ui, -apple-system, Segoe UI, sans-serif;
  color: var(--text);
  background: var(--bg-0);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background:
    radial-gradient(1200px 800px at 20% 10%, rgba(80, 110, 200, 0.18), transparent 60%),
    radial-gradient(1000px 700px at 80% 90%, rgba(160, 80, 220, 0.16), transparent 60%),
    radial-gradient(800px 600px at 50% 50%, rgba(0, 180, 200, 0.07), transparent 60%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1) 60%, #050610);
  min-height: 100vh;
  position: relative;
}

/* ambient orbs */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  opacity: 0.55;
  z-index: 0;
  animation: orb-drift 22s ease-in-out infinite alternate;
}
.orb-a { width: 460px; height: 460px; left: -120px; top: -120px; background: radial-gradient(circle, #4d7dff 0%, transparent 70%); }
.orb-b { width: 540px; height: 540px; right: -160px; bottom: -160px; background: radial-gradient(circle, #b87aff 0%, transparent 70%); animation-duration: 28s; }
.orb-c { width: 380px; height: 380px; left: 40%; top: 60%; background: radial-gradient(circle, #25e1ff 0%, transparent 70%); animation-duration: 34s; opacity: 0.35; }

@keyframes orb-drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(40px, -30px) scale(1.08); }
}

/* ----- layout ----- */
.stage {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 220px auto 220px;
  gap: 24px;
  align-items: start;
  justify-content: center;
  padding: 28px 28px 96px;
  max-width: 1100px;
  margin: 0 auto;
  min-height: 100vh;
}

.col {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 64px; /* align with board content under header */
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.04),
    0 10px 30px rgba(0, 0, 0, 0.35);
}

.panel-title {
  margin: 0 0 8px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.panel-hold canvas,
.panel-next canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  background:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(0, 0, 0, 0.22)),
    radial-gradient(circle at 30% 20%, rgba(122, 166, 255, 0.08), transparent 60%);
}

/* stats */
.panel-stats {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.stat {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 6px 4px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
}
.stat:last-child { border-bottom: none; }
.stat-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.stat-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 22px;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.stat-divider { color: var(--text-faint); margin: 0 2px; font-weight: 400; }
.stat-target { color: var(--text-dim); font-weight: 400; }

/* ----- board area ----- */
.board-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.board-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding-bottom: 4px;
  width: 300px;
}
.title-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.title-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.32em;
  color: var(--accent);
  text-transform: uppercase;
}
.title {
  margin: 0;
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: linear-gradient(135deg, #ffffff 0%, #b6c6ff 50%, #b87aff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.timer {
  font-family: 'JetBrains Mono', monospace;
  font-size: 44px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--text);
  margin-top: 4px;
  text-shadow: 0 0 22px rgba(122, 166, 255, 0.35);
}
.title { font-size: 22px; opacity: 0.92; }

.board-frame {
  position: relative;
  border-radius: var(--radius);
  padding: 8px;
  background: linear-gradient(180deg, rgba(122, 166, 255, 0.28), rgba(184, 122, 255, 0.18));
  box-shadow:
    0 0 0 1px rgba(140, 165, 230, 0.42),
    0 30px 70px rgba(0, 0, 0, 0.6),
    0 0 80px rgba(122, 166, 255, 0.18);
}
#board {
  display: block;
  border-radius: 10px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, rgba(0, 0, 0, 0.35) 100%),
    radial-gradient(circle at 50% 0%, rgba(122, 166, 255, 0.06), transparent 60%),
    #08091a;
}

.board-overlay {
  position: absolute;
  inset: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(6, 7, 13, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 10px;
  z-index: 5;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.18s ease;
}
.board-overlay.hidden { opacity: 0; pointer-events: none; }

.overlay-card {
  text-align: center;
  padding: 30px 24px;
  max-width: 280px;
}
.overlay-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}
.overlay-eyebrow.win { color: var(--good); }
.overlay-eyebrow.lose { color: var(--danger); }
.overlay-eyebrow.paused { color: var(--warn); }
.overlay-title {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #fff 0%, #b6c6ff 60%, #b87aff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.overlay-sub {
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 14px;
  line-height: 1.5;
}
.overlay-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 18px;
  margin-bottom: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  text-align: left;
}
.overlay-stats[hidden] { display: none; }
.overlay-stats > div {
  display: flex;
  justify-content: space-between;
  padding: 6px 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 6px;
}
.overlay-stats .k { color: var(--text-faint); letter-spacing: 0.1em; text-transform: uppercase; font-size: 10px; align-self: center; }
.overlay-stats .v { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }

.overlay-hint {
  margin-top: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* ----- legend ----- */
.legend {
  position: fixed;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 20px;
  padding: 10px 18px;
  background: rgba(10, 12, 22, 0.72);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2;
  font-size: 12px;
}
.legend-row {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.legend-label {
  color: var(--text-dim);
  text-transform: uppercase;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
}
.kbd-group { display: inline-flex; gap: 2px; align-items: center; color: var(--text-faint); font-size: 11px; }
kbd {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  min-width: 18px;
  text-align: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-bottom-width: 2px;
  border-radius: 5px;
  color: var(--text);
}

/* line clear pop */
@keyframes flash {
  0% { background: rgba(255, 255, 255, 0.16); }
  100% { background: transparent; }
}

/* ----- responsive ----- */
@media (max-width: 960px) {
  body { overflow: auto; }
  .stage {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 16px 12px 32px;
    min-height: auto;
  }
  .col { margin-top: 0; flex-direction: row; flex-wrap: wrap; justify-content: center; }
  .col-right { order: 3; }
  .panel { flex: 1 1 180px; max-width: 320px; }
  .panel-next canvas { max-height: 220px; }
  .board-wrap { width: 100%; }
  .board-header { width: 100%; max-width: 360px; margin: 0 auto; }
  .board-frame { width: min(92vw, 360px); margin: 0 auto; }
  #board { width: 100%; height: auto; aspect-ratio: 1 / 2; }
  .board-overlay { inset: 8px; }
  .legend {
    position: static;
    transform: none;
    margin: 18px auto 8px;
    flex-direction: row;
    flex-wrap: wrap;
    border-radius: 14px;
    padding: 10px 12px;
    max-width: 360px;
  }
  .timer { font-size: 36px; }
  .title { font-size: 18px; }
}

@media (max-width: 480px) {
  .timer { font-size: 30px; }
  .panel-stats .stat-value { font-size: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  .bg-orb { animation: none; }
}