/* ═══════════════════════════════════════════════
   PitchPath — Synthwave Arcade Aesthetic
   ═══════════════════════════════════════════════ */

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

:root {
  /* Core palette — midnight glass + electric citrus */
  --bg-deep: #0b0d12;
  --bg-mid: #151a26;
  --bg-card: rgba(20, 26, 40, 0.72);
  --bg-card-solid: #141a28;

  --accent-lime: #a8ff5c;
  --accent-coral: #ff7b6e;
  --accent-sky: #60d6ff;
  --accent-lilac: #c6a7ff;
  --accent-gold: #ffd166;

  --text: #f2f4ff;
  --text-dim: #8a94b6;
  --text-bright: #ffffff;

  --radius: 18px;
  --radius-sm: 12px;

  --font-display: 'Fraunces', serif;
  --font-body: 'IBM Plex Sans', sans-serif;

  --sweet-spot-color: rgba(168, 255, 92, 0.16);
  --sweet-spot-border: rgba(168, 255, 92, 0.45);
}

/* ─── Background canvas ─── */
#bg-canvas {
  position: fixed; inset: 0;
  z-index: -3;
  width: 100%; height: 100%;
  background:
    radial-gradient(1200px 600px at 10% 10%, rgba(96, 214, 255, 0.22), transparent 60%),
    radial-gradient(900px 500px at 90% 20%, rgba(255, 123, 110, 0.18), transparent 60%),
    radial-gradient(700px 700px at 30% 90%, rgba(198, 167, 255, 0.2), transparent 65%),
    linear-gradient(180deg, #0b0d12 0%, #0f1320 45%, #0b0d12 100%);
}

#particles-canvas {
  position: fixed; inset: 0;
  z-index: -2;
  pointer-events: none;
  opacity: 0.6;
}

body {
  font-family: var(--font-body);
  color: var(--text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  background: var(--bg-deep);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: repeating-linear-gradient(
    120deg,
    rgba(255,255,255,0.03) 0px,
    rgba(255,255,255,0.03) 1px,
    transparent 1px,
    transparent 6px
  );
  opacity: 0.15;
  pointer-events: none;
}

.container {
  width: min(560px, 94vw);
  padding: 2rem 1.25rem 2.5rem;
  position: relative;
  flex: 1 0 auto;
}

/* ─── Utility ─── */
.hidden { display: none !important; }

/* ─── Screen transitions ─── */
.screen {
  display: none;
  animation: screenIn 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
  padding-top: 2.25rem;
}
.screen.active { display: block; }

@keyframes screenIn {
  from { opacity: 0; transform: translateY(18px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ═══ CARDS ═══ */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: 0 18px 60px rgba(8, 10, 18, 0.45);
}
.card-sm {
  background: rgba(20, 26, 40, 0.6);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  box-shadow: 0 12px 40px rgba(6, 8, 16, 0.35);
}

/* ═══ BUTTONS ═══ */
.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s;
  display: inline-flex; align-items: center; justify-content: center;
  gap: 0.5rem;
  -webkit-user-select: none; user-select: none;
}
.btn:active { transform: scale(0.96); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent-lime), var(--accent-sky));
  color: #0b0d12;
  padding: 0.9rem 2.5rem;
  box-shadow: 0 10px 30px rgba(96,214,255,0.3);
}
.btn-primary:hover { box-shadow: 0 14px 40px rgba(96,214,255,0.45); transform: translateY(-1px); }

.btn-accent {
  background: linear-gradient(135deg, var(--accent-coral), var(--accent-gold));
  color: #1b1010;
  padding: 0.9rem 2.5rem;
  box-shadow: 0 10px 30px rgba(255,123,110,0.35);
}
.btn-accent:hover { box-shadow: 0 14px 40px rgba(255,123,110,0.55); transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  padding: 0.75rem 2rem;
  border: 1px solid rgba(255,255,255,0.14);
}
.btn-ghost:hover { border-color: var(--accent-sky); color: var(--accent-sky); }

.btn-icon, .btn-icon-sm {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s, border-color 0.15s;
  display: inline-flex; align-items: center; justify-content: center;
}
.btn-icon { width: 46px; height: 46px; font-size: 1.2rem; }
.btn-icon-sm { width: 36px; height: 36px; font-size: 1rem; }
.btn-icon:hover, .btn-icon-sm:hover { background: rgba(255,255,255,0.16); border-color: var(--accent-sky); transform: scale(1.08); }
.btn-icon.playing, .btn-icon-sm.playing {
  background: var(--accent-lime); color: #10140f; animation: iconPulse 0.3s ease infinite;
}

.btn-back {
  position: absolute;
  top: 0.4rem; left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  z-index: 10;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
}
.btn-back:hover { color: var(--accent-sky); border-color: rgba(96,214,255,0.5); background: rgba(96,214,255,0.12); }

.btn-row { display: flex; gap: 0.75rem; justify-content: center; margin-top: 1.5rem; }

/* ═══ START SCREEN ═══ */
.logo-group { text-align: center; margin-bottom: 2.2rem; }

.logo-icon {
  font-size: 2.6rem;
  display: inline-block;
  animation: logoFloat 4s ease-in-out infinite;
  text-shadow: 0 10px 30px rgba(255,123,110,0.35);
}
@keyframes logoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2.9rem;
  letter-spacing: 0.01em;
  background: linear-gradient(130deg, var(--accent-lime) 0%, var(--accent-sky) 55%, var(--accent-lilac) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: none;
}

.tagline {
  color: var(--text-dim);
  font-size: 1.05rem;
  font-weight: 400;
  margin-top: 0.4rem;
  letter-spacing: 0.02em;
}

.instructions { margin-bottom: 2rem; }
.instructions h2 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  color: var(--accent-gold);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.instruction-row {
  display: flex; align-items: center; gap: 0.75rem;
  font-size: 1rem;
  padding: 0.4rem 0;
}
.instruction-row .icon { font-size: 1.3rem; flex-shrink: 0; }

.start-buttons {
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
  margin-bottom: 2rem;
}
.start-buttons .btn { width: 220px; }

/* ═══ HIGH SCORES ═══ */
.highscore-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,230,0,0.15);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  text-align: left;
}
.highscore-card h3 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--accent-gold);
  margin-bottom: 0.75rem;
}
.hs-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.35rem 0;
  font-size: 0.9rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.hs-row:last-child { border: none; }
.hs-rank { color: var(--accent-gold); font-family: var(--font-display); font-size: 0.8rem; width: 2rem; }
.hs-diff { color: var(--text-dim); font-size: 0.8rem; text-transform: capitalize; }
.hs-score { color: var(--accent-sky); font-family: var(--font-display); }

/* ═══ CALIBRATION ═══ */
.screen-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  letter-spacing: 0.02em;
  color: var(--accent-sky);
  text-align: center;
  margin: 1.8rem 0 0.6rem;
}
.screen-subtitle {
  text-align: center;
  color: var(--text-dim);
  font-size: 1rem;
  margin-bottom: 1.6rem;
}

.calibrate-note {
  display: flex; align-items: center; justify-content: center; gap: 1rem;
  margin-bottom: 1.5rem;
}
.note-big {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent-coral);
}

.calibrate-feedback { text-align: center; margin-bottom: 1.25rem; }
.detected-pitch {
  display: inline-flex; flex-direction: column; align-items: center; gap: 0.2rem;
  margin-bottom: 0.5rem;
}
.detected-pitch .label { font-size: 0.75rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.06em; }
.value-lg {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-sky);
}

.status-text {
  font-size: 0.95rem;
  color: var(--text-dim);
  min-height: 1.4rem;
  transition: color 0.2s;
}
.status-text.match { color: var(--accent-lime); font-weight: 600; }
.status-text.close { color: var(--accent-sky); }

/* ═══ PITCH BAR ═══ */
.pitch-bar-wrap { margin-bottom: 1.5rem; }

.pitch-bar {
  background: var(--bg-card-solid);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  height: 72px;
  position: relative;
  overflow: hidden;
}

/* Sweet spot zone */
.sweet-spot {
  position: absolute;
  top: 0; bottom: 0;
  background: var(--sweet-spot-color);
  border-left: 2px solid var(--sweet-spot-border);
  border-right: 2px solid var(--sweet-spot-border);
  transition: left 0.15s ease-out, width 0.15s ease-out;
  pointer-events: none;
}

.marker {
  position: absolute;
  height: 100%;
  border-radius: 3px;
  transition: left 0.08s linear;
  pointer-events: none;
}

.marker.target {
  width: 6px;
  background: var(--accent-coral);
  box-shadow: 0 0 14px var(--accent-coral);
  left: 50%; transform: translateX(-50%);
  z-index: 2;
}

.marker.current {
  width: 6px;
  background: var(--accent-sky);
  box-shadow: 0 0 14px var(--accent-sky);
  left: 50%; transform: translateX(-50%);
  z-index: 3;
}

.marker.current.matched {
  background: var(--accent-lime);
  box-shadow: 0 0 24px var(--accent-lime), 0 0 48px rgba(57,255,20,0.3);
  width: 8px;
}

.bar-labels {
  display: flex; justify-content: space-between;
  padding: 0.3rem 0.5rem 0;
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ═══ GAME HUD ═══ */
.game-hud {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 2rem 0 1rem;
}

.hud-item {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  text-align: center;
  min-width: 70px;
  position: relative;
}

.hud-label {
  display: block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.hud-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
}

.score-box .hud-value { color: var(--accent-sky); }
.streak-box .hud-value { color: var(--accent-gold); }
.combo-box .hud-value { color: var(--accent-lilac); }

.streak-fire {
  position: absolute;
  top: -8px; right: -4px;
  font-size: 1.2rem;
  animation: fireWiggle 0.4s ease-in-out infinite;
}

@keyframes fireWiggle {
  0%, 100% { transform: rotate(-5deg); }
  50% { transform: rotate(5deg); }
}

/* Score pop animation */
@keyframes scorePop {
  0% { transform: scale(1); }
  40% { transform: scale(1.35); }
  100% { transform: scale(1); }
}
.score-pop .hud-value { animation: scorePop 0.35s ease; }

/* ═══ CHALLENGE HUD ═══ */
.challenge-hud { margin-bottom: 1rem; }

.challenge-progress-bar {
  height: 6px;
  background: var(--bg-card-solid);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.4rem;
}
.challenge-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-coral), var(--accent-sky));
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
}

.challenge-info {
  display: flex; justify-content: space-between;
  font-size: 0.8rem; color: var(--text-dim);
}
.challenge-timer {
  font-family: var(--font-display);
  color: var(--accent-gold);
}

/* ═══ TOLERANCE ═══ */
.tolerance-control {
  margin-bottom: 1rem;
}
.tolerance-control label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}
.tolerance-control #tolerance-value {
  color: var(--accent-sky);
  font-weight: 600;
}

#tolerance-slider {
  width: 100%; height: 6px;
  border-radius: 3px;
  background: var(--bg-deep);
  outline: none;
  -webkit-appearance: none;
}
#tolerance-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent-coral);
  cursor: pointer;
  transition: transform 0.15s;
  box-shadow: 0 0 10px rgba(255,45,123,0.5);
}
#tolerance-slider::-webkit-slider-thumb:hover { transform: scale(1.25); }
#tolerance-slider::-moz-range-thumb {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent-coral);
  cursor: pointer; border: none;
}

/* ═══ TRANSPOSE ═══ */
.transpose-control {
  margin-bottom: 1rem;
}
.transpose-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}
.transpose-label {
  font-size: 0.8rem;
  color: var(--text-dim);
}
.transpose-display {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-lilac);
  min-width: 3rem;
  text-align: right;
}
.transpose-buttons {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}
.btn-transpose, .btn-transpose-reset {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
}
.btn-transpose:hover, .btn-transpose-reset:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--accent-lilac);
  transform: scale(1.05);
}
.btn-transpose:active, .btn-transpose-reset:active {
  transform: scale(0.95);
}
.btn-transpose-reset {
  font-family: var(--font-display);
  color: var(--accent-lilac);
}

/* ═══ NOTE DISPLAY ═══ */
.pitch-display {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.note-card {
  background: rgba(18, 24, 38, 0.7);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 0.9rem 1.25rem;
  text-align: center;
  min-width: 110px;
  box-shadow: 0 14px 34px rgba(6, 10, 22, 0.4);
}
.note-card .label {
  display: block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 0.15rem;
}
.note-name {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  display: block;
}
.target-card .note-name { color: var(--accent-coral); }
.your-card .note-name { color: var(--accent-sky); }

.note-actions {
  display: flex; gap: 0.4rem; justify-content: center; margin-top: 0.4rem;
}

/* ═══ PROGRESS RING ═══ */
.hold-section { display: flex; justify-content: center; margin-bottom: 1rem; }

.progress-ring {
  width: 110px; height: 110px;
  position: relative;
}
.progress-ring svg { transform: rotate(-90deg); }

.progress-ring circle {
  fill: none;
  stroke-width: 7;
  stroke-linecap: round;
}

.ring-bg { stroke: rgba(255,255,255,0.06); }
.ring-progress {
  stroke: var(--accent-lime);
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transition: stroke-dashoffset 0.08s linear;
  filter: drop-shadow(0 0 6px rgba(57,255,20,0.5));
}

.hold-text {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}
.hold-text.active {
  color: var(--accent-lime);
  animation: holdPulse 0.6s ease infinite;
}

@keyframes holdPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  50% { transform: translate(-50%, -50%) scale(1.08); opacity: 0.85; }
}

/* ═══ FEEDBACK ═══ */
.feedback {
  text-align: center;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  min-height: 1.8rem;
  color: var(--accent-lime);
}

.feedback.miss {
  color: var(--accent-coral);
  animation: feedbackShake 0.35s ease;
}

@keyframes feedbackShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* Score fly animation */
.score-fly {
  position: fixed;
  pointer-events: none;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--accent-lime);
  text-shadow: 0 0 10px rgba(57,255,20,0.6);
  z-index: 100;
  animation: scoreFly 0.8s ease-out forwards;
}

@keyframes scoreFly {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-60px) scale(1.3); }
}

/* Particle burst */
.particle {
  position: fixed;
  width: 6px; height: 6px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 99;
  animation: particleBurst 0.6s ease-out forwards;
}

@keyframes particleBurst {
  0% { opacity: 1; transform: translate(var(--dx), var(--dy)) scale(1); }
  100% { opacity: 0; transform: translate(calc(var(--dx) * 4), calc(var(--dy) * 4)) scale(0); }
}

/* Screen shake */
.shake {
  animation: screenShake 0.3s ease;
}
@keyframes screenShake {
  0%, 100% { transform: translate(0,0); }
  25% { transform: translate(-3px, 2px); }
  50% { transform: translate(3px, -2px); }
  75% { transform: translate(-2px, 1px); }
}

/* ═══ DIFFICULTY SELECT ═══ */
.difficulty-cards {
  display: flex; flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.diff-card {
  background: rgba(18, 24, 38, 0.7);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: calc(var(--radius) + 2px);
  padding: 1.4rem 1.25rem;
  display: flex; align-items: center; gap: 1rem;
  cursor: pointer;
  transition: transform 0.18s, border-color 0.2s, box-shadow 0.2s, background 0.2s;
  text-align: left;
  font-family: var(--font-body);
  color: var(--text);
}
.diff-card:hover {
  transform: translateY(-2px) scale(1.01);
  border-color: rgba(96,214,255,0.45);
  background: rgba(22, 30, 48, 0.85);
  box-shadow: 0 18px 40px rgba(6, 10, 22, 0.45);
}
.diff-card:active { transform: scale(0.98); }

.diff-emoji { font-size: 2rem; flex-shrink: 0; }
.diff-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  display: block;
}
.diff-desc {
  font-size: 0.8rem;
  color: var(--text-dim);
  display: block;
  margin-top: 0.15rem;
}

/* ═══ RESULTS ═══ */
.results-card {
  text-align: center;
  margin: 1.5rem 0;
}
.result-row {
  display: flex; justify-content: space-between;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 1rem;
}
.result-row:last-of-type { border: none; }
.result-val {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--accent-sky);
}
.new-highscore {
  margin-top: 1rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--accent-gold);
  animation: hsFlash 0.6s ease infinite alternate;
}
@keyframes hsFlash {
  from { opacity: 0.6; transform: scale(1); }
  to   { opacity: 1;   transform: scale(1.05); }
}

/* ═══ ICON PULSE ═══ */
@keyframes iconPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

/* ═══ RESPONSIVE ═══ */
@media (max-width: 480px) {
  .container { padding: 1rem 0.75rem 1.5rem; }
  .logo { font-size: 2.2rem; }
  .pitch-display { gap: 0.6rem; }
  .note-card { min-width: 90px; padding: 0.6rem 0.75rem; }
  .note-name { font-size: 1.5rem; }
  .game-hud { gap: 0.5rem; }
  .hud-item { padding: 0.4rem 0.6rem; min-width: 60px; }
  .hud-value { font-size: 1.3rem; }
  .progress-ring { width: 90px; height: 90px; }
  .start-buttons .btn { width: 200px; }
}

@media (max-width: 360px) {
  .logo { font-size: 1.8rem; }
  .pitch-display { flex-direction: column; align-items: center; }
}

/* ═══ FOOTER ═══ */
.site-footer {
  width: 100%;
  max-width: 480px;
  text-align: center;
  padding: 2rem 1rem 1rem;
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 300;
  opacity: 0.7;
  transition: opacity 0.2s;
  margin-top: auto;
}
.site-footer:hover {
  opacity: 1;
}