:root {
  --bg-top: #09111f;
  --bg-bottom: #13273f;
  --panel: rgba(7, 15, 29, 0.82);
  --panel-border: rgba(163, 196, 255, 0.22);
  --text: #f6f7fb;
  --muted: #adc0df;
  --accent: #ffd166;
  --accent-soft: rgba(255, 209, 102, 0.16);
  --danger: #ff6b6b;
  --shadow: rgba(0, 0, 0, 0.28);
  --board-shadow: rgba(7, 15, 29, 0.5);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(95, 168, 255, 0.22), transparent 34%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

body {
  min-height: 100vh;
}

.layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(320px, 1fr);
  gap: 24px;
  padding: 28px;
  align-items: center;
}

.hud-panel,
.board-shell {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 28px;
  box-shadow: 0 24px 60px var(--shadow);
  backdrop-filter: blur(12px);
}

.hud-panel {
  padding: 28px;
}

.eyebrow,
.label {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--muted);
}

h1 {
  margin: 8px 0 12px;
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  line-height: 0.95;
}

.subtitle,
.message,
.controls li {
  color: var(--muted);
  line-height: 1.55;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0;
}

.stat-card,
.next-piece,
.controls,
.audio-panel {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.03);
}

.stat-card {
  padding: 16px 14px;
}

.stat-card strong {
  display: block;
  margin-top: 10px;
  font-size: 1.75rem;
}

.next-piece,
.controls,
.audio-panel {
  padding: 18px;
  margin-top: 18px;
}

.preview-stack {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-height: 128px;
}

.preview-orb {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  box-shadow:
    inset -6px -7px 10px rgba(0, 0, 0, 0.25),
    inset 4px 4px 10px rgba(255, 255, 255, 0.2),
    0 8px 18px rgba(0, 0, 0, 0.18);
}

.controls ul {
  margin: 12px 0 0;
  padding-left: 18px;
}

kbd {
  display: inline-block;
  min-width: 2rem;
  padding: 4px 8px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--accent-soft);
  color: var(--text);
  font-weight: 700;
  text-align: center;
}

.message {
  margin-top: 22px;
}

.audio-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.sound-toggle {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, rgba(76, 201, 240, 0.28), rgba(76, 201, 240, 0.08));
  color: var(--text);
  border-radius: 999px;
  padding: 11px 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.sound-toggle.is-on {
  background: linear-gradient(180deg, rgba(6, 214, 160, 0.34), rgba(6, 214, 160, 0.12));
}

.board-shell {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 18px;
}

.board-wrap {
  width: min(100%, 336px);
}

canvas {
  width: min(100%, 336px);
  height: auto;
  border-radius: 22px;
  box-shadow: 0 24px 44px var(--board-shadow);
}

.touch-controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.touch-controls button {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, rgba(255, 209, 102, 0.24), rgba(255, 209, 102, 0.1));
  color: var(--text);
  border-radius: 14px;
  padding: 12px 8px;
  font: inherit;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.touch-controls button:active {
  transform: translateY(1px) scale(0.99);
}

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .hud-panel {
    order: 2;
  }

  .board-shell {
    order: 1;
  }
}

@media (max-width: 520px) {
  .stats {
    grid-template-columns: 1fr;
  }

  .hud-panel {
    padding: 22px;
  }

  .touch-controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}