:root {
  color-scheme: dark;
  --bg: #060c1b;
  --panel: #111d38;
  --line: #345388;
  --text: #eef4ff;
  --muted: #a8bde5;
  --cyan: #71f4ff;
  --pink: #ff8fda;
  --amber: #ffd07f;
  --ok: #8ff8b8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% -5%, rgba(113, 244, 255, 0.2), transparent 36%),
    radial-gradient(circle at 88% 0%, rgba(255, 143, 218, 0.18), transparent 32%),
    linear-gradient(180deg, #0e1630 0%, var(--bg) 100%);
}

.deck {
  width: min(1100px, 95vw);
  margin: 1.25rem auto 2rem;
  display: grid;
  gap: 0.85rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0));
  padding: 0.95rem 1.05rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  color: var(--cyan);
  font-size: 0.72rem;
}

h1 {
  margin: 0.26rem 0 0;
  font-size: clamp(1.65rem, 4vw, 2.5rem);
}

.subtitle {
  margin: 0.45rem 0 0;
  color: var(--muted);
  max-width: 66ch;
}

.hud {
  display: grid;
  gap: 0.65rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.48rem;
}

.stat {
  border: 1px solid #385a90;
  border-radius: 10px;
  background: rgba(8, 15, 31, 0.64);
  padding: 0.45rem 0.56rem;
  display: grid;
  gap: 0.12rem;
}

.stat span {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.64rem;
}

.stat strong {
  font-size: 1.08rem;
  font-variant-numeric: tabular-nums;
}

.boost-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.boost-track {
  width: min(360px, 52vw);
  height: 12px;
  border-radius: 999px;
  border: 1px solid #42649b;
  overflow: hidden;
  background: #0a1329;
}

.boost-fill {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #43d0ff, #7effc8, #ffe288);
  transition: width 120ms linear;
}

#boostLabel {
  color: #d3e2ff;
  font-size: 0.85rem;
}

.hint {
  margin: 0;
  color: #bfd2f5;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

button {
  border: 1px solid #3d5f95;
  border-radius: 10px;
  background: #15233d;
  color: var(--text);
  font: inherit;
  padding: 0.5rem 0.88rem;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.08);
}

button:active {
  transform: translateY(1px);
}

button.primary {
  border-color: #08b8c8;
  background: linear-gradient(180deg, #76f6ff, #1792a6);
  color: #05232c;
  font-weight: 700;
}

.track-panel {
  padding: 0.72rem;
}

canvas {
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid #3c5f97;
  display: block;
  background: #040914;
}

.notes ul {
  margin: 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.3rem;
}

.back-link {
  display: inline-block;
  margin-top: 0.78rem;
  color: #9cf7ff;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

@media (max-width: 980px) {
  .stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .deck {
    width: min(560px, 96vw);
  }

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

  .boost-wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  .boost-track {
    width: 100%;
  }
}