:root {
  --bg-primary: #0D1117;
  --bg-secondary: #161B22;
  --bg-tertiary: #21262D;
  --text-primary: #F0F6FC;
  --text-secondary: #8B949E;
  --text-muted: #484F58;
  --accent: #3B82F6;
  --accent-glow: rgba(59, 130, 246, 0.3);
  --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;
    --accent-glow: rgba(49, 130, 246, 0.2);
    --border: #D0D7DE;
    --btn-bg: #E9ECF0;
    --btn-active: #D0D7DE;
    --overlay-bg: rgba(255, 255, 255, 0.9);
    --board-bg: #F0F2F5;
  }
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  touch-action: manipulation;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Pretendard', 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  user-select: none;
  -webkit-user-select: none;
}

/* ─── App Shell ─────────────────────────────────────── */
#app {
  position: relative;
  width: 100%;
  max-width: 480px;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ─── Overlays ──────────────────────────────────────── */
.overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--overlay-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 24px;
  gap: 20px;
  transition: opacity 0.3s ease;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

/* ─── Title ─────────────────────────────────────────── */
.game-title {
  font-size: clamp(3rem, 16vw, 5rem);
  font-weight: 900;
  letter-spacing: -2px;
  background: linear-gradient(135deg, #3B82F6, #8B5CF6, #EC4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  text-align: center;
}

.game-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.5;
}

/* ─── Score Card (overlay) ───────────────────────────── */
.score-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 32px;
  text-align: center;
  width: 100%;
  max-width: 280px;
}

.score-card .label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.score-card .value {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}

.score-card .value.accent {
  background: linear-gradient(135deg, #3B82F6, #8B5CF6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.new-record-badge {
  display: inline-block;
  background: linear-gradient(135deg, #F59E0B, #EF4444);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 99px;
  margin-top: 8px;
}

/* ─── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--btn-bg);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  min-width: 160px;
}

.btn:active {
  background: var(--btn-active);
  transform: scale(0.96);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn.primary:active {
  background: #2563EB;
  box-shadow: none;
}

/* ─── HUD ───────────────────────────────────────────── */
#hud {
  flex-shrink: 0;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 16px 8px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.hud-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 4px;
}

.hud-item .hud-label {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.hud-item .hud-value {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  transition: color 0.2s;
}

#timer-value {
  color: var(--accent);
}

#timer-value.urgent {
  color: #EF4444;
  animation: pulse-urgent 0.5s ease-in-out infinite alternate;
}

@keyframes pulse-urgent {
  from { opacity: 1; }
  to   { opacity: 0.5; }
}

/* combo */
#combo-display {
  flex-shrink: 0;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
}

.combo-text {
  font-size: 0.85rem;
  font-weight: 700;
  color: #F59E0B;
  letter-spacing: 0.5px;
  animation: combo-pop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes combo-pop {
  from { transform: scale(0.5); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

/* ─── Board ─────────────────────────────────────────── */
#board-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--board-bg);
  padding: 16px;
}

#board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 340px;
  aspect-ratio: 1;
}

/* ─── Hole ──────────────────────────────────────────── */
.hole {
  position: relative;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 2px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.15s;
}

.hole::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(255,255,255,0.06), transparent 60%);
  pointer-events: none;
}

.hole.miss-flash {
  animation: miss-anim 0.3s ease;
}

@keyframes miss-anim {
  0%   { border-color: var(--border); }
  40%  { border-color: #EF4444; background: rgba(239, 68, 68, 0.15); }
  100% { border-color: var(--border); background: var(--bg-tertiary); }
}

/* ─── Mole ──────────────────────────────────────────── */
.mole {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1.8rem, 8vw, 2.6rem);
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #6B4C2A, #3D2B15);
  transform: translateY(100%);
  transition: transform 0.18s cubic-bezier(0.34, 1.3, 0.64, 1);
  pointer-events: none;
}

.mole.up {
  transform: translateY(0%);
}

.mole.hit {
  animation: hit-anim 0.25s ease forwards;
  pointer-events: none;
}

@keyframes hit-anim {
  0%   { transform: translateY(0%) scale(1); background: radial-gradient(circle, #F59E0B, #EF4444); }
  50%  { transform: translateY(-10%) scale(1.25); }
  100% { transform: translateY(100%) scale(0.6); opacity: 0; }
}

/* ─── Score Popup ───────────────────────────────────── */
.score-popup {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  font-size: 1.1rem;
  font-weight: 800;
  color: #3B82F6;
  pointer-events: none;
  animation: score-rise 0.7s ease forwards;
  white-space: nowrap;
  z-index: 5;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

@keyframes score-rise {
  0%   { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(-40px); }
}

/* ─── Bottom bar ────────────────────────────────────── */
#bottom-bar {
  flex-shrink: 0;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

#best-score-bar {
  font-size: 0.78rem;
  color: var(--text-muted);
}

#best-score-bar span {
  color: var(--text-secondary);
  font-weight: 700;
}

/* ─── Misc ──────────────────────────────────────────── */
.divider {
  width: 100%;
  max-width: 280px;
  height: 1px;
  background: var(--border);
}