:root {
  --void: #06060a;
  --panel: rgba(8, 12, 24, 0.94);
  --text: #e8f4ff;
  --muted: rgba(232, 244, 255, 0.5);
  --cyan: #00ffd5;
  --magenta: #ff00aa;
  --gold: #ffd700;
  --border: rgba(0, 255, 213, 0.15);
  --glow: 0 0 24px rgba(0, 255, 213, 0.25);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: "JetBrains Mono", "Courier New", monospace;
  color: var(--text);
  background: var(--void);
  user-select: none;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 30% 10%, rgba(0, 255, 213, 0.08) 0%, transparent 45%),
    radial-gradient(ellipse at 80% 90%, rgba(255, 0, 170, 0.06) 0%, transparent 40%);
  z-index: 0;
}

.stage {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 0.5rem;
  gap: 0.5rem;
}

.hud {
  display: flex;
  align-items: center;
  width: min(960px, 100%);
  padding: 0 0.25rem;
  gap: 0.75rem;
}

.hud-block {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.hud-block.hud-center {
  flex: 1;
  text-align: center;
}

.hud-block.hud-right {
  align-items: flex-end;
  margin-left: auto;
}

.hud-label {
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.hud-value {
  font-family: Orbitron, sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--cyan);
  text-shadow: var(--glow);
}

.level-tag {
  font-family: Orbitron, sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--magenta);
}

.hud-actions {
  display: flex;
  gap: 0.4rem;
}

.icon-btn {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.65rem;
  padding: 0.35rem 0.55rem;
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.icon-btn:hover {
  border-color: var(--cyan);
  box-shadow: var(--glow);
}

.canvas-wrap {
  position: relative;
  width: min(960px, 100%);
  border: 2px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(255, 0, 170, 0.08),
    0 12px 40px rgba(0, 0, 0, 0.5),
    inset 0 0 60px rgba(0, 255, 213, 0.03);
}

#gameCanvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 960 / 480;
  background: #0a1628;
  cursor: pointer;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(4, 6, 12, 0.88);
  backdrop-filter: blur(8px);
  padding: 1rem;
}

.overlay.hidden {
  display: none;
}

.card {
  width: min(420px, 100%);
  padding: 1.75rem 1.5rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--glow);
}

.title-main {
  display: block;
  font-family: Orbitron, sans-serif;
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 900;
  letter-spacing: 0.08em;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--cyan), var(--magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-sub {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.tagline {
  margin: 1rem 0;
  font-size: 0.78rem;
  line-height: 1.55;
  color: rgba(232, 244, 255, 0.75);
}

.tagline strong {
  color: var(--cyan);
}

.controls-hint {
  font-size: 0.68rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.controls-hint kbd {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: rgba(0, 255, 213, 0.06);
  color: var(--cyan);
}

.options-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-bottom: 1rem;
  font-size: 0.72rem;
}

.options-row label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  color: var(--muted);
}

.options-row input {
  accent-color: var(--cyan);
}

.level-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-bottom: 1rem;
  max-height: 180px;
  overflow-y: auto;
}

.level-btn {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: rgba(0, 255, 213, 0.04);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  text-align: left;
}

.level-btn:hover {
  background: rgba(0, 255, 213, 0.1);
  border-color: var(--cyan);
}

.level-btn-name {
  font-family: Orbitron, sans-serif;
  font-weight: 600;
  font-size: 0.82rem;
}

.level-btn-best {
  color: var(--muted);
  font-size: 0.68rem;
}

.footer-links {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.68rem;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--cyan);
}

.end-title {
  font-family: Orbitron, sans-serif;
  font-size: 1.3rem;
  color: #00ff88;
  text-align: center;
  margin-bottom: 0.75rem;
}

.end-stats {
  margin-bottom: 1rem;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  padding: 0.35rem 0;
  font-size: 0.78rem;
  border-bottom: 1px solid var(--border);
}

.stat-row strong {
  color: var(--cyan);
  font-family: Orbitron, sans-serif;
}

.play-btn {
  display: block;
  width: 100%;
  padding: 0.75rem;
  font-family: Orbitron, sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--void);
  background: linear-gradient(135deg, var(--cyan), #00ccaa);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.12s;
}

.play-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--glow);
}

.physics-note {
  margin-top: 0.75rem;
  font-size: 0.62rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.4;
}

@media (max-width: 520px) {
  .hud-actions {
    display: none;
  }

  .card {
    padding: 1.25rem 1rem;
  }
}