:root {
  --bg: #0b0e12;
  --bg2: #11151b;
  --fg: #e8f1ea;
  --dim: #7d8b96;
  --accent: #59e88f;
  --accent2: #ffcb47;
  --danger: #ff5d5d;
  --panel: #161b22;
  --border: #2a323d;
  --mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--mono);
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 18px 12px 40px;
  background:
    radial-gradient(circle at 15% -10%, #123326 0%, transparent 55%),
    radial-gradient(circle at 100% 0%, #2a1830 0%, transparent 45%),
    var(--bg);
}

#app {
  width: 100%;
  max-width: 860px;
}

header {
  text-align: center;
  margin-bottom: 10px;
}

header h1 {
  font-size: 2.1rem;
  margin: 0 0 4px;
  letter-spacing: -0.02em;
  color: var(--accent);
  text-shadow: 0 0 18px rgba(89, 232, 143, 0.35);
}

header h1 .disk { display: inline-block; transform: translateY(2px); }

header p {
  margin: 0;
  color: var(--dim);
  font-size: 0.9rem;
}

header p a { color: var(--accent2); }

#hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin: 14px 0 8px;
  padding: 8px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.95rem;
  flex-wrap: wrap;
}

#hud .stat { display: flex; align-items: center; gap: 6px; }
#hud .stat .label { color: var(--dim); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; }
#hud .stat .val { font-weight: 700; }
#hud #stars { color: var(--danger); letter-spacing: 2px; }
#hud #combo.hot { color: var(--accent2); }

#upgrade-track {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  padding: 6px 14px;
  background: rgba(255, 203, 71, 0.06);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.78rem;
  color: var(--dim);
  flex-wrap: wrap;
}

#upgrade-track #upgrade-icons {
  font-size: 1rem;
  letter-spacing: 3px;
}

#upgrade-track #upgrade-next {
  color: var(--accent2);
}

#stage {
  position: relative;
  width: 100%;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #060809;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), inset 0 0 0 1px rgba(255,255,255,0.02);
}

#game {
  display: block;
  width: 100%;
  height: auto;
}

.scanlines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0,0,0,0) 0px,
    rgba(0,0,0,0) 2px,
    rgba(0,0,0,0.12) 3px
  );
  mix-blend-mode: multiply;
  opacity: 0.5;
}

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(6, 8, 9, 0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
  gap: 14px;
}

.overlay.hidden { display: none; }

.overlay h2 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--accent2);
}

.overlay .big-score {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--accent);
  text-shadow: 0 0 20px rgba(89, 232, 143, 0.4);
}

.overlay .subline { color: var(--dim); font-size: 0.85rem; max-width: 480px; line-height: 1.5; }

.overlay .howto {
  text-align: left;
  color: var(--dim);
  font-size: 0.82rem;
  line-height: 1.65;
  max-width: 480px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
}

.overlay .howto b { color: var(--fg); }
.overlay .howto .k { color: var(--accent2); }

button, .btn {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--accent);
  color: #06110b;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

button:hover, .btn:hover { filter: brightness(1.08); }

button.secondary, .btn.secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}

.share-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

#touch-controls {
  position: absolute;
  inset: 0;
  display: none;
  pointer-events: none;
}

#touch-controls.active { display: block; }

.dpad {
  position: absolute;
  left: 14px;
  bottom: 14px;
  width: 132px;
  height: 132px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 4px;
  pointer-events: auto;
}

.dpad button {
  padding: 0;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--fg);
  font-size: 1.1rem;
  border-radius: 8px;
}

.dpad button:active { background: rgba(89, 232, 143, 0.35); }

#btn-up { grid-column: 2; grid-row: 1; }
#btn-left { grid-column: 1; grid-row: 2; }
#btn-right { grid-column: 3; grid-row: 2; }
#btn-down { grid-column: 2; grid-row: 3; }

.action-btn {
  position: absolute;
  right: 18px;
  bottom: 24px;
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: var(--accent2);
  color: #241800;
  border: none;
  font-weight: 800;
  font-size: 0.78rem;
  pointer-events: auto;
  box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}

.action-btn:active { filter: brightness(0.9); }

footer {
  margin-top: 22px;
  text-align: center;
  color: var(--dim);
  font-size: 0.78rem;
}

footer a { color: var(--accent2); }

canvas#shareCanvas { display: none; }

@media (max-width: 480px) {
  header h1 { font-size: 1.6rem; }
  .overlay .howto { font-size: 0.76rem; }
}