:root {
  --bg-primary: #0D1117;
  --bg-secondary: #161B22;
  --bg-tertiary: #21262D;
  --text-primary: #F0F6FC;
  --text-secondary: #8B949E;
  --text-muted: #484F58;
  --accent: #3B82F6;
  --border: #30363D;
  --btn-bg: #21262D;
  --btn-active: #30363D;
  --overlay-bg: rgba(0, 0, 0, 0.85);
  --board-bg: #0A0E14;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #FFFFFF;
    --bg-secondary: #F6F8FA;
    --bg-tertiary: #E9ECF0;
    --text-primary: #1B1E28;
    --text-secondary: #57606A;
    --text-muted: #8C959F;
    --accent: #3182F6;
    --border: #D0D7DE;
    --btn-bg: #E9ECF0;
    --btn-active: #D0D7DE;
    --overlay-bg: rgba(255, 255, 255, 0.9);
    --board-bg: #F0F2F5;
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

html, body {
  width: 100%;
  height: 100dvh;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Pretendard', 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  height: 100dvh;
  max-width: 480px;
  margin: 0 auto;
  position: relative;
  background: var(--bg-primary);
}

/* Header */
#header {
  width: 100%;
  padding: 12px 16px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  flex-shrink: 0;
  z-index: 10;
}

.header-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.label {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  font-weight: 600;
}

.value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.value.accent {
  color: var(--accent);
}

#lives-display {
  display: flex;
  gap: 4px;
  font-size: 18px;
}

/* Canvas Area */
#canvas-wrapper {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  overflow: hidden;
  background: var(--board-bg);
}

#gameCanvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

/* D-pad controls */
#controls {
  width: 100%;
  padding: 12px 16px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.stats-mini {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 80px;
}

.stat-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.stat-icon {
  font-size: 14px;
  width: 18px;
  text-align: center;
}

.stat-text {
  font-size: 13px;
  color: var(--text-secondary);
}

.stat-text span {
  color: var(--text-primary);
  font-weight: 600;
}

#dpad {
  display: grid;
  grid-template-columns: repeat(3, 44px);
  grid-template-rows: repeat(3, 44px);
  gap: 3px;
}

.dpad-btn {
  background: var(--btn-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s, transform 0.1s;
  touch-action: manipulation;
  -webkit-user-select: none;
}

.dpad-btn:active,
.dpad-btn.pressed {
  background: var(--btn-active);
  transform: scale(0.93);
}

.dpad-center {
  background: transparent;
  border-color: transparent;
  font-size: 12px;
  color: var(--text-muted);
  cursor: default;
}

.dpad-center:active {
  transform: none;
  background: transparent;
}

/* Overlays */
.overlay {
  position: absolute;
  inset: 0;
  background: var(--overlay-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 24px;
  gap: 0;
}

.overlay.hidden {
  display: none;
}

.game-title {
  font-size: 48px;
  font-weight: 800;
  background: linear-gradient(135deg, #3B82F6, #60A5FA, #93C5FD);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -2px;
  line-height: 1;
  margin-bottom: 6px;
  text-align: center;
}

.game-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 32px;
}

.overlay-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  width: 100%;
  max-width: 300px;
  margin-bottom: 16px;
}

.overlay-card-title {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 600;
  margin-bottom: 12px;
}

.score-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.score-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.score-label {
  font-size: 11px;
  color: var(--text-secondary);
}

.score-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}

.score-value.accent {
  color: var(--accent);
}

.hint-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hint-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

.hint-key {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 40px;
  text-align: center;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  max-width: 300px;
  transition: opacity 0.15s, transform 0.1s;
  font-family: inherit;
  letter-spacing: -0.3px;
}

.btn-primary:active {
  opacity: 0.85;
  transform: scale(0.97);
}

.btn-secondary {
  background: var(--btn-bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  max-width: 300px;
  transition: opacity 0.15s, transform 0.1s;
  font-family: inherit;
  margin-top: 8px;
}

.btn-secondary:active {
  opacity: 0.85;
  transform: scale(0.97);
}

.result-icon {
  font-size: 56px;
  margin-bottom: 12px;
  line-height: 1;
}

.result-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.8px;
}

.result-sub {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* Level badge */
.level-badge {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.level-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* Best score display */
.best-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.best-val {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 15px;
}

@media (max-height: 700px) {
  .game-title { font-size: 38px; margin-bottom: 4px; }
  .game-subtitle { margin-bottom: 20px; }
  .overlay-card { padding: 14px; margin-bottom: 12px; }
  #header { padding: 8px 14px 6px; }
  #controls { padding: 8px 14px 10px; }
  .dpad-btn { width: 40px; height: 40px; font-size: 16px; }
  #dpad { grid-template-columns: repeat(3, 40px); grid-template-rows: repeat(3, 40px); }
}