:root {
  --bg: #16161a;
  --surface: #222229;
  --border: #2e2e38;
  --accent: #f0a050;
  --accent2: #e07090;
  --danger: #f87171;
  --text: #e8e6e3;
  --text-dim: #8b8b97;
  --mono: 'JetBrains Mono', monospace;
  --display: 'Inter', system-ui, sans-serif;
  --body: 'Inter', system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--body);
  overflow-x: hidden;
}

.back-link {
  position: fixed;
  top: calc(20px + env(safe-area-inset-top, 0px));
  left: 24px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.back-link:hover { color: var(--accent); }

.shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: calc(92px + env(safe-area-inset-top, 0px)) 24px 40px;
  position: relative;
  z-index: 1;
}

.kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--accent);
  text-transform: uppercase;
}

.title {
  font-family: var(--display);
  font-size: clamp(56px, 10vw, 108px);
  font-weight: 800;
  line-height: 0.9;
  margin-top: 10px;
}

.title span {
  display: block;
  color: var(--accent);
}

.subtitle {
  margin-top: 14px;
  color: var(--text-dim);
}

.panel {
  margin-top: 20px;
  border: 1px solid var(--border);
  background: rgba(34, 34, 41, 0.82);
  border-radius: 18px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.hud {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  padding: 12px;
}

.chip {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  padding: 10px 12px;
  display: grid;
  gap: 5px;
}

.chip span {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.chip strong {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 700;
}

.stage-wrap {
  position: relative;
  padding: 14px;
}

#gameCanvas {
  width: 100%;
  max-width: 100%;
  display: block;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #12121a;
  touch-action: none;
}

.overlay {
  position: absolute;
  inset: 14px;
  border-radius: 14px;
  background: rgba(22, 22, 26, 0.85);
  backdrop-filter: blur(4px);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 20px;
}

.overlay h2 {
  font-family: var(--display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.overlay p {
  margin-top: 8px;
  color: var(--text-dim);
  max-width: 540px;
}

#finalSummary {
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
}

.difficulty-control {
  margin-top: 14px;
  display: grid;
  gap: 6px;
  width: min(300px, 100%);
}

.difficulty-control span {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.difficulty-control select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: #fff;
  padding: 10px 12px;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hidden { display: none; }

.btn {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: #fff;
  padding: 12px 16px;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s;
}

.btn-primary {
  border-color: rgba(240, 160, 80, 0.45);
  box-shadow: 0 2px 12px rgba(240, 160, 80, 0.10);
}

.btn-primary:hover { color: var(--accent); }

.legend {
  padding: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.legend-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  padding: 10px;
  font-size: 13px;
  color: #a8a8b4;
  display: flex;
  align-items: center;
  gap: 8px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: 0 0 10px;
}

.dot.food { background: #22c55e; }
.dot.growth { background: #3b82f6; }
.dot.magnet { background: #eab308; }
.dot.hazard { background: var(--danger); }
.dot.barrier { background: #a855f7; }
.dot.shield { background: #00ffdc; }

.health-chip {
  display: grid;
  gap: 5px;
}

.health-bar {
  width: 100%;
  height: 10px;
  background: rgba(255,255,255,0.08);
  border-radius: 5px;
  overflow: hidden;
}

.health-fill {
  height: 100%;
  min-height: 10px;
  width: 100%;
  background: #22c55e;
  border-radius: 5px;
  transition: width 0.1s linear, background 0.15s linear;
}

.pause-chip {
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: #fff;
  font-size: 18px;
  display: grid;
  place-items: center;
  padding: 10px 12px;
  font-family: var(--mono);
  transition: border-color 0.12s;
}

.pause-chip:hover {
  border-color: var(--accent2);
}

.high-scores {
  margin-top: 12px;
  text-align: left;
  width: min(320px, 100%);
}

.high-scores h3 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}

.high-scores ol {
  list-style: none;
  counter-reset: rank;
  padding: 0;
}

.high-scores li {
  counter-increment: rank;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text);
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  margin-bottom: 4px;
}

.high-scores li::before {
  content: counter(rank) ". ";
  color: var(--text-dim);
}

.high-scores li strong {
  color: #fff;
}

@media (max-width: 860px) {
  .hud { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .legend { grid-template-columns: 1fr; }
}