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

/* Hide scrollbars */
* { scrollbar-width: none; -ms-overflow-style: none; }
*::-webkit-scrollbar { display: none; }

:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --surface2: #1a1a26;
  --border: #2a2a3a;
  --cyan: #00f0ff;
  --cyan-dim: #00f0ff44;
  --magenta: #ff00aa;
  --magenta-dim: #ff00aa44;
  --green: #00ff88;
  --green-dim: #00ff8844;
  --red: #ff3355;
  --red-dim: #ff335544;
  --yellow: #ffcc00;
  --text: #e8e8f0;
  --text-dim: #888899;
  --glow-cyan: 0 0 20px #00f0ff66, 0 0 40px #00f0ff22;
  --glow-magenta: 0 0 20px #ff00aa66, 0 0 40px #ff00aa22;
  --glow-green: 0 0 20px #00ff8866, 0 0 40px #00ff8822;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Chakra Petch', sans-serif;
  overflow-y: auto;
  overflow-x: hidden;
}

/* Scanline overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.08) 2px,
    rgba(0,0,0,0.08) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* Background grid */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,240,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── HEADER ── */
.header {
  text-align: center;
  padding: 16px 0 12px;
  flex-shrink: 0;
  position: relative;
}
.settings-gear {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-dim);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 6px 10px;
  transition: all 0.2s;
}
.settings-gear:hover { color: var(--cyan); border-color: var(--cyan-dim); }

/* Settings screen */
.settings-screen {
  display: none;
  padding: 10px 16px 30px;
}
.settings-screen.active { display: block; }
.settings-back {
  font-family: 'Chakra Petch', sans-serif;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--cyan);
  font-size: 0.9rem;
  cursor: pointer;
  padding: 8px 16px;
  margin-bottom: 16px;
  transition: all 0.2s;
}
.settings-back:hover { border-color: var(--cyan); background: var(--surface2); }
.settings-title {
  font-family: 'Orbitron', monospace;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 20px;
  letter-spacing: 3px;
}
.settings-group {
  margin-bottom: 20px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}
.settings-group-title {
  font-family: 'Orbitron', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--magenta);
  letter-spacing: 2px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.setting-row:last-child { margin-bottom: 0; }
.setting-label {
  font-size: 0.85rem;
  color: var(--text-dim);
  flex: 1;
}
.setting-value {
  font-family: 'Orbitron', monospace;
  font-size: 0.8rem;
  color: var(--cyan);
  min-width: 50px;
  text-align: right;
  margin-left: 8px;
}
.setting-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 140px;
  height: 6px;
  border-radius: 3px;
  background: var(--surface2);
  outline: none;
  margin: 0 10px;
}
.setting-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--cyan);
  cursor: pointer;
  box-shadow: 0 0 8px var(--cyan-dim);
}
.setting-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--cyan);
  cursor: pointer;
  border: none;
}
.settings-save {
  font-family: 'Chakra Petch', sans-serif;
  width: 100%;
  padding: 14px;
  font-size: 1.1rem;
  font-weight: 700;
  border: 2px solid var(--green);
  border-radius: 12px;
  background: transparent;
  color: var(--green);
  cursor: pointer;
  letter-spacing: 2px;
  transition: all 0.2s;
  margin-top: 10px;
}
.settings-save:hover { background: var(--green); color: var(--bg); }
.settings-reset {
  font-family: 'Chakra Petch', sans-serif;
  width: 100%;
  padding: 10px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  letter-spacing: 1px;
  transition: all 0.2s;
  margin-top: 8px;
}
.settings-reset:hover { border-color: var(--red); color: var(--red); }

.logo {
  font-family: 'Orbitron', monospace;
  font-size: 2.2rem;
  font-weight: 900;
  letter-spacing: 6px;
  background: linear-gradient(135deg, var(--cyan), var(--magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 0 12px rgba(0,240,255,0.3));
  text-transform: uppercase;
}

.logo-sub {
  font-size: 0.7rem;
  letter-spacing: 8px;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-top: 2px;
}

/* ── SCREENS ── */
.screen {
  display: none;
  flex: 1;
  flex-direction: column;
}
.screen.active {
  display: flex;
}

/* ── SETUP SCREEN ── */
#setup {
  gap: 16px;
  overflow-y: auto;
}

.section-label {
  font-family: 'Orbitron', monospace;
  font-size: 0.7rem;
  letter-spacing: 4px;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.interval-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.interval-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'Chakra Petch', sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 10px 6px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  line-height: 1.3;
  user-select: none;
}

.interval-btn:hover {
  border-color: var(--cyan-dim);
  background: var(--surface2);
}

.interval-btn.selected {
  background: linear-gradient(135deg, rgba(0,240,255,0.12), rgba(255,0,170,0.08));
  border-color: var(--cyan);
  color: var(--text);
  box-shadow: var(--glow-cyan);
}

.scale-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.scale-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'Chakra Petch', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 10px 6px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  line-height: 1.3;
  user-select: none;
}

.scale-btn:hover {
  border-color: var(--cyan-dim);
  background: var(--surface2);
}

.scale-btn.selected {
  background: linear-gradient(135deg, rgba(0,240,255,0.12), rgba(255,0,170,0.08));
  border-color: var(--cyan);
  color: var(--text);
  box-shadow: var(--glow-cyan);
}

.scale-btn .chord-label {
  display: block;
  font-size: 0.6rem;
  color: var(--text-dim);
  margin-top: 2px;
  opacity: 0.7;
}

.scale-btn.selected .chord-label {
  color: var(--cyan);
  opacity: 1;
}

.mode-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.mode-btn {
  flex: 1 1 auto;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'Chakra Petch', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 10px 6px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.mode-btn:hover {
  border-color: var(--cyan-dim);
}

.mode-btn.selected {
  background: linear-gradient(135deg, rgba(0,240,255,0.1), rgba(255,0,170,0.06));
  border-color: var(--cyan);
  color: var(--text);
}

.direction-row {
  display: flex;
  gap: 8px;
}

.dir-btn {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'Chakra Petch', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.dir-btn:hover {
  border-color: var(--cyan-dim);
}

.dir-btn.selected {
  background: linear-gradient(135deg, rgba(0,240,255,0.1), rgba(255,0,170,0.06));
  border-color: var(--cyan);
  color: var(--text);
}

.preset-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.preset-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'Chakra Petch', sans-serif;
  font-size: 0.72rem;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.preset-btn:hover {
  border-color: var(--magenta-dim);
  color: var(--text);
}
.speed-btn.active {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-dim);
}

.time-slider-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 4px;
}
.time-slider {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--surface2);
  outline: none;
}
.time-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--cyan);
  cursor: pointer;
  box-shadow: var(--glow-cyan);
}
.time-label {
  font-family: 'Orbitron', monospace;
  font-size: 1rem;
  color: var(--cyan);
  min-width: 36px;
  text-align: right;
}

.start-btn {
  background: linear-gradient(135deg, var(--cyan), var(--magenta));
  border: none;
  color: #000;
  font-family: 'Orbitron', monospace;
  font-size: 1.1rem;
  font-weight: 900;
  padding: 16px;
  border-radius: 8px;
  cursor: pointer;
  letter-spacing: 4px;
  text-transform: uppercase;
  transition: all 0.3s;
  margin-top: auto;
  flex-shrink: 0;
}

.start-btn:hover {
  transform: scale(1.02);
  box-shadow: var(--glow-cyan), var(--glow-magenta);
}

.start-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* ── GAME SCREEN ── */
#game {
  gap: 12px;
  position: relative;
}

.game-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.score-display {
  font-family: 'Orbitron', monospace;
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
}

.score-label {
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 3px;
}

.hi-score {
  font-family: 'Orbitron', monospace;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.timer-bar-wrap {
  height: 4px;
  background: var(--surface2);
  border-radius: 2px;
  overflow: hidden;
  flex-shrink: 0;
}

.timer-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--yellow), var(--red));
  border-radius: 2px;
  transition: width 0.1s linear;
  width: 100%;
}

/* Challenge display */
.challenge-area {
  flex: 0 0 auto;
  text-align: center;
  padding: 20px 0;
}

.interval-name {
  font-family: 'Orbitron', monospace;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--magenta);
  text-shadow: var(--glow-magenta);
  margin-bottom: 8px;
}

.note-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 30px;
  margin-top: 10px;
}

.note-box {
  text-align: center;
}

.note-box-label {
  font-size: 0.6rem;
  letter-spacing: 3px;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.note-box-value {
  font-family: 'Orbitron', monospace;
  font-size: 2.2rem;
  font-weight: 900;
}

.note-from { color: var(--text-dim); }
.note-target { color: var(--cyan); text-shadow: var(--glow-cyan); }

.arrow-dir {
  font-size: 2rem;
  color: var(--magenta);
  animation: arrowPulse 1s ease-in-out infinite;
}

@keyframes arrowPulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.2); }
}

/* Piano visualization */
.piano-wrap {
  flex: 0 0 auto;
  padding: 12px 0;
}

.piano {
  position: relative;
  height: 70px;
  display: flex;
  margin: 0 auto;
  max-width: 100%;
  border-radius: 0 0 4px 4px;
  overflow: hidden;
}

.piano-key {
  flex: 1;
  background: linear-gradient(180deg, #e8e8e8, #d0d0d0);
  border: 1px solid #999;
  border-radius: 0 0 3px 3px;
  position: relative;
  min-width: 0;
}

.piano-key.black {
  background: linear-gradient(180deg, #333, #111);
  border-color: #000;
  margin: 0 -3%;
  z-index: 2;
  flex: 0.6;
  height: 60%;
}

.piano-key.active-from {
  background: linear-gradient(180deg, var(--magenta), #aa0066) !important;
  box-shadow: 0 0 12px var(--magenta);
}

.piano-key.active-target {
  background: linear-gradient(180deg, var(--cyan), #0088aa) !important;
  box-shadow: 0 0 12px var(--cyan);
}

.piano-key.active-singing {
  background: linear-gradient(180deg, var(--green), #00aa55) !important;
  box-shadow: 0 0 12px var(--green);
}

/* Pitch meter */
.pitch-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  min-height: 0;
}

.pitch-meter-wrap {
  position: relative;
  height: 50px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.pitch-meter-center {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
  z-index: 3;
}

.pitch-meter-zones {
  position: absolute;
  inset: 0;
  display: flex;
}

.pitch-zone {
  flex: 1;
}

.pitch-zone.far-low { background: rgba(255,51,85,0.08); }
.pitch-zone.low { background: rgba(255,204,0,0.06); }
.pitch-zone.center-zone { background: rgba(0,255,136,0.08); }
.pitch-zone.high { background: rgba(255,204,0,0.06); }
.pitch-zone.far-high { background: rgba(255,51,85,0.08); }

.pitch-needle {
  position: absolute;
  top: 4px;
  bottom: 4px;
  width: 6px;
  background: var(--green);
  border-radius: 3px;
  box-shadow: var(--glow-green);
  transition: left 0.08s ease-out, background 0.2s;
  z-index: 4;
  left: 50%;
  transform: translateX(-50%);
}

.pitch-needle.off-pitch {
  background: var(--red);
  box-shadow: 0 0 12px var(--red);
}

.pitch-needle.close {
  background: var(--yellow);
  box-shadow: 0 0 12px var(--yellow);
}

.singing-note {
  text-align: center;
  font-family: 'Orbitron', monospace;
  font-size: 1rem;
  color: var(--text-dim);
  min-height: 1.4em;
}

.singing-note span {
  color: var(--green);
  text-shadow: var(--glow-green);
}

/* Progress fill for correct hold */
.hold-progress-wrap {
  height: 6px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
}

.hold-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--green));
  border-radius: 3px;
  width: 0%;
  transition: width 0.05s linear;
}

/* Success flash */
.success-flash {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, rgba(0,255,136,0.2), transparent 70%);
  pointer-events: none;
  opacity: 0;
  z-index: 100;
}

.success-flash.show {
  animation: flashIn 0.4s ease-out;
}

@keyframes flashIn {
  0% { opacity: 1; }
  100% { opacity: 0; }
}

/* Streak dots */
.streak-dots {
  display: flex;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  padding: 4px 0;
  flex-shrink: 0;
}

.streak-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
  animation: dotIn 0.3s ease-out;
}

@keyframes dotIn {
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.4); }
  100% { transform: scale(1); opacity: 1; }
}

/* ── GAME OVER ── */
#gameover {
  align-items: center;
  justify-content: center;
  gap: 24px;
  text-align: center;
}

.go-title {
  font-family: 'Orbitron', monospace;
  font-size: 2rem;
  font-weight: 900;
  color: var(--red);
  text-shadow: 0 0 30px rgba(255,51,85,0.5);
  letter-spacing: 6px;
}

.go-score {
  font-family: 'Orbitron', monospace;
  font-size: 4rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--cyan), var(--magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.go-score-label {
  font-size: 0.7rem;
  letter-spacing: 4px;
  color: var(--text-dim);
  text-transform: uppercase;
}

.go-best {
  font-family: 'Orbitron', monospace;
  font-size: 0.85rem;
  color: var(--yellow);
}

.go-new-best {
  color: var(--green);
  text-shadow: var(--glow-green);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.retry-btn {
  background: linear-gradient(135deg, var(--cyan), var(--magenta));
  border: none;
  color: #000;
  font-family: 'Orbitron', monospace;
  font-size: 1rem;
  font-weight: 900;
  padding: 14px 40px;
  border-radius: 8px;
  cursor: pointer;
  letter-spacing: 3px;
  text-transform: uppercase;
  transition: all 0.3s;
}

.retry-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--glow-cyan), var(--glow-magenta);
}

.back-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'Chakra Petch', sans-serif;
  font-size: 0.8rem;
  padding: 8px 20px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.back-btn:hover {
  border-color: var(--text-dim);
  color: var(--text);
}

/* Mic permission hint */
.mic-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  padding: 4px;
}

/* Replay hint */
.replay-hint {
  font-family: 'Chakra Petch', sans-serif;
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  padding: 10px 16px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  margin: 4px auto;
  max-width: 320px;
}
.replay-hint:hover, .replay-hint:active {
  color: var(--cyan);
  border-color: var(--cyan-dim);
  background: var(--surface2);
}
.answer-btn {
  border-color: var(--magenta-dim, #553355);
  color: var(--magenta, #ff66cc);
}
.answer-btn:hover, .answer-btn:active {
  color: var(--magenta, #ff66cc);
  border-color: var(--magenta, #ff66cc);
  background: var(--surface2);
}
.replay-hint kbd {
  display: inline-block;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 6px;
  font-family: 'Chakra Petch', sans-serif;
  font-size: 0.65rem;
  color: var(--cyan);
}

/* Responsive */
@media (max-height: 700px) {
  .logo { font-size: 1.6rem; }
  .challenge-area { padding: 10px 0; }
  .interval-name { font-size: 1.2rem; }
  .note-box-value { font-size: 1.6rem; }
  .piano { height: 50px; }
}