/* LayerPlay App Styles */
/* Design tokens match landing page */

:root {
  --bg-deep: #0a0a0f;
  --bg-card: #12121a;
  --bg-surface: #0f0f17;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --accent-secondary: #22d3ee;
  --text-primary: #f0f0f5;
  --text-secondary: #8b8ba0;
  --text-dim: #555570;
  --border: rgba(255,255,255,0.06);
  --drums-color: #f97316;
  --bass-color: #8b5cf6;
  --keys-color: #22d3ee;
  --lead-color: #34d399;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.6;
  min-height: 100vh;
}
h1, h2, h3, h4, h5 { font-family: 'Space Grotesk', sans-serif; }

/* --- NAV --- */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.logo-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: white;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.nav-btn {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.nav-btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.nav-btn-ghost:hover {
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.15);
}

.nav-btn-primary {
  background: var(--accent);
  color: white;
}
.nav-btn-primary:hover {
  background: #5558e6;
}

/* --- HIDDEN UTILITY --- */
.hidden { display: none !important; }

/* --- UPLOAD VIEW --- */
.upload-view {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
  padding-top: 80px;
}

.drop-zone {
  width: 100%;
  max-width: 560px;
  padding: 4rem 2rem;
  border: 2px dashed rgba(99, 102, 241, 0.25);
  border-radius: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  background: var(--bg-card);
  position: relative;
  overflow: hidden;
}

.drop-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(99,102,241,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.06);
  transform: scale(1.01);
}

.drop-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  display: block;
  opacity: 0.7;
}

.drop-zone h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  position: relative;
}

.drop-zone p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  position: relative;
}

.upload-hint {
  margin-top: 1.5rem;
  color: var(--text-dim);
  font-size: 0.78rem;
  position: relative;
}

/* --- PROCESSING VIEW --- */
.processing-view {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
  padding-top: 80px;
}

.processing-card {
  text-align: center;
  max-width: 480px;
  width: 100%;
}

.processing-card h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 2rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.progress-container {
  width: 100%;
  height: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* Spinner animation */
.processing-card::after {
  content: '';
  display: block;
  width: 40px;
  height: 40px;
  margin: 2rem auto 0;
  border: 3px solid rgba(255,255,255,0.06);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- PLAYER VIEW --- */
.player-view {
  padding-top: 60px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.player-header {
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  flex-wrap: wrap;
  gap: 0.8rem;
}

.player-track-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.player-track-info h3 {
  font-size: 1rem;
  font-weight: 600;
  max-width: 300px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bpm-badge {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent);
  border-radius: 20px;
  letter-spacing: 0.5px;
}

.layer-toggles {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.layer-toggle {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--layer-color, var(--text-secondary));
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.layer-toggle .toggle-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--layer-color, var(--text-secondary));
  transition: all 0.2s;
}

.layer-toggle .note-count {
  font-weight: 400;
  font-size: 0.65rem;
  opacity: 0.6;
  margin-left: 0.2rem;
}

.layer-toggle:hover {
  border-color: var(--layer-color, rgba(255,255,255,0.2));
  background: rgba(255,255,255,0.03);
}

.layer-toggle.muted {
  opacity: 0.35;
  border-color: rgba(255,255,255,0.04);
}

.layer-toggle.muted .toggle-dot {
  background: #444;
}

/* --- LAYER GROUPS (toggle + export button) --- */
.layer-group {
  display: flex;
  align-items: center;
  gap: 0;
}

.layer-group .layer-toggle {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  border-right: none;
}

.midi-export-btn {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.72rem;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border);
  border-left: 1px solid rgba(255,255,255,0.03);
  border-radius: 0 8px 8px 0;
  background: transparent;
  color: var(--layer-color, var(--text-secondary));
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.5;
}

.midi-export-btn:hover {
  opacity: 1;
  background: rgba(255,255,255,0.06);
  border-color: var(--layer-color, rgba(255,255,255,0.2));
}

.midi-export-btn:active {
  transform: scale(0.92);
}

.midi-export-btn svg {
  flex-shrink: 0;
}

/* Export All button */
.export-all-btn {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: 8px;
  background: rgba(99, 102, 241, 0.08);
  color: var(--accent);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.export-all-btn:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--accent);
}

.export-all-btn:active {
  transform: scale(0.95);
}

/* --- VISUALIZER --- */
.viz-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  min-height: 380px;
}

.viz-container canvas {
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-deep);
  cursor: pointer;
}

/* --- PLAYER CONTROLS --- */
.player-controls {
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

.play-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.play-btn:hover {
  background: #5558e6;
  transform: scale(1.05);
}

.play-btn:active {
  transform: scale(0.95);
}

.play-btn svg {
  width: 18px;
  height: 18px;
}

/* Seek bar */
.seek-bar {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.seek-bar::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg-deep);
  transition: transform 0.15s;
}

.seek-bar::-webkit-slider-thumb:hover {
  transform: scale(1.3);
}

.seek-bar::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg-deep);
}

.time-display {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.78rem;
  color: var(--text-secondary);
  white-space: nowrap;
  min-width: 90px;
  text-align: right;
}

/* --- ERROR TOAST --- */
.error-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 0.8rem 1.5rem;
  background: #dc2626;
  color: white;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  z-index: 200;
  opacity: 0;
  transition: all 0.3s;
  box-shadow: 0 8px 30px rgba(220,38,38,0.3);
}

.error-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
  .player-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .player-track-info {
    width: 100%;
  }
  .layer-toggles {
    width: 100%;
  }
  .player-controls {
    padding: 0.8rem 1rem;
    gap: 0.6rem;
  }
  .play-btn {
    width: 38px;
    height: 38px;
  }
  .viz-container {
    padding: 0.5rem;
    min-height: 300px;
  }
  .drop-zone {
    padding: 3rem 1.5rem;
  }
  nav {
    padding: 0.8rem 1rem;
  }
}

@media (max-width: 480px) {
  .layer-toggle .note-count {
    display: none;
  }
  .time-display {
    min-width: 70px;
    font-size: 0.7rem;
  }
  .export-all-btn span,
  .export-all-btn {
    font-size: 0.65rem;
    padding: 0.35rem 0.6rem;
  }
}