: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;
  }
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Pretendard', 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  justify-content: center;
  align-items: center;
}

#app {
  position: relative;
  width: 100%;
  max-width: 480px;
  height: 100dvh;
  overflow: hidden;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

/* ── Canvas ── */
#gameCanvas {
  display: block;
  width: 100%;
  height: 100%;
  background-color: var(--board-bg);
  cursor: crosshair;
  touch-action: none;
}

/* ── HUD ── */
#hud {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.6) 0%, transparent 100%);
  pointer-events: none;
  z-index: 10;
}

@media (prefers-color-scheme: light) {
  #hud {
    background: linear-gradient(to bottom, rgba(255,255,255,0.7) 0%, transparent 100%);
  }
}

.hud-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.hud-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.hud-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

#timerValue {
  font-size: 26px;
  font-weight: 800;
  color: var(--accent);
  transition: color 0.3s;
}

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

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

/* ── Overlay base ── */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: var(--overlay-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 20;
  padding: 32px 24px;
  text-align: center;
  gap: 0;
  transition: opacity 0.25s ease;
}

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

/* ── Title ── */
.game-title {
  font-size: 64px;
  font-weight: 900;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent) 0%, #A78BFA 50%, #EC4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}

.game-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  letter-spacing: 0.04em;
}

/* ── Stats card ── */
.stats-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 28px;
  width: 100%;
  max-width: 300px;
  margin-bottom: 28px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
}

.stat-row + .stat-row {
  border-top: 1px solid var(--border);
}

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

.stat-row-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-row-value.highlight {
  color: var(--accent);
  font-size: 18px;
}

/* ── High score badge ── */
.highscore-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 99px;
  margin-bottom: 16px;
  opacity: 0;
  transition: opacity 0.3s;
}

.highscore-badge.visible {
  opacity: 1;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  width: 100%;
  max-width: 300px;
  padding: 16px 24px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--btn-bg);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.btn:active {
  background: var(--btn-active);
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-size: 18px;
  padding: 18px 24px;
}

.btn-primary:active {
  background: color-mix(in srgb, var(--accent) 80%, black);
}

.btn + .btn {
  margin-top: 10px;
}

/* ── Instructions ── */
.instructions {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 300px;
}

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

.inst-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 3px solid transparent;
  flex-shrink: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.inst-dot::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: currentColor;
  position: absolute;
}

.inst-dot.bullseye {
  border-color: #EF4444;
  color: #EF4444;
}

.inst-dot.inner {
  border-color: #F59E0B;
  color: #F59E0B;
}

.inst-dot.outer {
  border-color: #10B981;
  color: #10B981;
}

/* ── Result overlay extras ── */
.result-title {
  font-size: 40px;
  font-weight: 900;
  margin-bottom: 6px;
  background: linear-gradient(135deg, var(--accent) 0%, #A78BFA 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.new-record {
  font-size: 13px;
  font-weight: 700;
  color: #F59E0B;
  letter-spacing: 0.06em;
  margin-bottom: 20px;
  min-height: 18px;
}

/* ── Score popup (DOM layer) ── */
.score-popup {
  position: absolute;
  font-size: 20px;
  font-weight: 800;
  pointer-events: none;
  z-index: 15;
  animation: floatUp 0.7s ease-out forwards;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

@keyframes floatUp {
  0%   { opacity: 1; transform: translateY(0) scale(1); }
  60%  { opacity: 1; transform: translateY(-30px) scale(1.1); }
  100% { opacity: 0; transform: translateY(-60px) scale(0.8); }
}

.score-popup.bullseye { color: #EF4444; }
.score-popup.inner    { color: #F59E0B; }
.score-popup.outer    { color: #10B981; }
.score-popup.miss     { color: var(--text-muted); font-size: 14px; }

/* ── Combo display ── */
#comboDisplay {
  position: absolute;
  top: 72px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: #F59E0B;
  pointer-events: none;
  z-index: 11;
  opacity: 0;
  transition: opacity 0.3s;
  white-space: nowrap;
}

#comboDisplay.visible {
  opacity: 1;
}