:root {
  color-scheme: light;
  --bg: #0b0b10;
  --fg: #f3f3f3;
  --muted: #b7b7c2;
  --accent: #ff9f1c;
  --panel: rgba(12, 12, 18, 0.85);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: radial-gradient(1200px 800px at 20% 10%, #1b1b28, #09090d 60%, #050508 100%);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--fg);
}

#game {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(6px);
  z-index: 10;
}

.overlay.hidden {
  display: none;
}

.hidden {
  display: none;
}

.panel {
  width: min(520px, 92vw);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 24px;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.panel h1 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: 0.3px;
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 22px;
  letter-spacing: 0.2px;
}

.panel p {
  margin: 0 0 16px;
  color: var(--muted);
}

.field {
  display: grid;
  gap: 6px;
  margin-bottom: 16px;
  font-size: 14px;
  color: var(--muted);
}

.checkbox-field {
  margin-top: 4px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
}

input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

input[type="range"] {
  width: 100%;
  margin: 6px 0 0;
  accent-color: var(--accent);
}

select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: #f3f3f3;
  color: #1b1200;
  color-scheme: light;
  -webkit-text-fill-color: #1b1200;
}

select option {
  color: #1b1200;
  background: #f3f3f3;
}

.row {
  display: flex;
  gap: 12px;
}

button {
  flex: 1;
  padding: 12px 16px;
  border-radius: 10px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent);
  color: #1b1200;
}

button.ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--fg);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.hint {
  margin-top: 16px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.hint code {
  color: #ffd38a;
}

.hud {
  position: fixed;
  top: 18px;
  left: 18px;
  display: grid;
  gap: 6px;
  z-index: 5;
  font-size: 14px;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.6);
}

#hud-stage {
  font-weight: 600;
}

#hud-timer {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

#hud-status {
  color: var(--muted);
}

@media (max-width: 720px) {
  .panel {
    padding: 18px;
  }

  .panel h1 {
    font-size: 22px;
  }

  .panel h2 {
    font-size: 18px;
  }
}