* { box-sizing: border-box; }

:root {
  --game-bg: #0d1117;
  color-scheme: dark;
  --slider-track: #262c33;
  --slider-thumb: #8b949e;
}

html, body {
  margin: 0;
  height: 100%;
}

body {
  background: #0a0c10;
  color: #c9d1d9;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

#app { height: 100%; }

.hidden { display: none !important; }

button { touch-action: manipulation; user-select: none; }

/* Buttons */
.btn {
  background: #1c2128;
  color: #c9d1d9;
  border: 1px solid #30363d;
  border-radius: 10px;
  padding: 12px 20px;
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.btn:hover:not(:disabled) { background: #24292f; border-color: #444c56; }
.btn:active:not(:disabled) { background: #2a3138; }
.btn:disabled { opacity: .35; cursor: not-allowed; }
.btn.sm { padding: 9px 14px; font-size: 14px; }
.btn.ghost { background: transparent; border-color: transparent; color: #8b949e; }
.btn.ghost:hover:not(:disabled) { color: #c9d1d9; background: transparent; }
.btn.dp { width: 54px; height: 54px; padding: 0; font-size: 20px; border-radius: 12px; }

/* Screens */
.screen { min-height: 100%; }
.screen.centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
  text-align: center;
}

.title { font-size: 40px; letter-spacing: .15em; margin: 0; }
.subtitle { color: #8b949e; margin: 0 0 12px; font-size: 15px; }

/* New game settings */
.settings { display: flex; flex-direction: column; gap: 18px; margin: 8px 0 4px; }
.setting { display: flex; flex-direction: column; gap: 8px; }
.setting > label { color: #8b949e; font-size: 13px; letter-spacing: .04em; }
.stepper { display: flex; align-items: center; gap: 14px; justify-content: center; }
.stepper-value { min-width: 28px; font-size: 20px; font-variant-numeric: tabular-nums; }
.seed-row { display: flex; align-items: center; gap: 10px; }
.seed-value {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  color: #a5b6c9;
  background: #12161c;
  border: 1px solid #262c33;
  border-radius: 8px;
  padding: 8px 12px;
  min-width: 200px;
}

/* Game screen */
#game-screen {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--game-bg);
}
.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
}
.hud-center { color: #8b949e; font-size: 14px; text-align: center; }
.hud-progress { margin-top: 2px; }
.hud-right {
  display: flex;
  gap: 14px;
  color: #8b949e;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.canvas-wrap {
  position: relative;
  width: fit-content;
  line-height: 0;
}
#maze-canvas { display: block; }

.controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 14px 16px 22px;
}
.dpad {
  display: grid;
  grid-template-rows: repeat(3, auto);
  grid-template-columns: repeat(3, auto);
  gap: 8px;
}
#btn-up { grid-area: 1 / 2; }
#btn-left { grid-area: 2 / 1; }
#btn-right { grid-area: 2 / 3; }
#btn-down { grid-area: 3 / 2; }

.board {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.vert-slider {
  position: absolute;
  right: 100%;
  margin-right: 10px;
  top: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.vert-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  writing-mode: vertical-lr;
  direction: rtl;
  width: 22px;
  flex: 1 1 auto;
  cursor: pointer;
  max-height: 500px;
  margin-top: 75px;
}

.horiz-slider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 6px 16px 2px;
}

.horiz-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  width: min(500px, 72vw);
  height: 20px;
  cursor: pointer;
  max-width: 500px;
}

.slider-tag {
  color: #8b949e;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: .03em;
  white-space: nowrap;
}

/* Slider track + thumb tinted with the current game palette */
.horiz-slider input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 3px;
  background: var(--slider-track);
}
.horiz-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  margin-top: -6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--slider-thumb);
}
.horiz-slider input[type="range"]::-moz-range-track {
  height: 6px;
  border-radius: 3px;
  background: var(--slider-track);
}
.horiz-slider input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--slider-thumb);
  border: none;
}

.vert-slider input[type="range"]::-webkit-slider-runnable-track {
  width: 6px;
  border-radius: 3px;
  background: var(--slider-track);
}
.vert-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  margin-left: -6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--slider-thumb);
}
.vert-slider input[type="range"]::-moz-range-track {
  width: 6px;
  border-radius: 3px;
  background: var(--slider-track);
}
.vert-slider input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--slider-thumb);
  border: none;
}

/* Overlays */
.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(4, 6, 9, .72);
  padding: 24px;
  z-index: 10;
}
.menu-card {
  background: #151a20;
  border: 1px solid #262c33;
  border-radius: 16px;
  padding: 30px 34px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  min-width: 240px;
  text-align: center;
  box-shadow: 0 18px 50px rgba(0, 0, 0, .5);
}
.menu-card h2 { margin: 0 0 4px; font-size: 24px; }
.menu-card p { margin: 0; color: #8b949e; font-size: 15px; }