/* ============================================================
   STRUDEL BUILDER - CSS
   Canvas Piano Roll Edition
   ============================================================ */

:root {
  --bg-deep: #0a0a0f;
  --bg-surface: #12121a;
  --bg-card: #1a1a26;
  --bg-card-hover: #22222f;
  --bg-elevated: #252533;
  --border: #2a2a3a;
  --border-active: #4a4a6a;
  --text-primary: #e8e8f0;
  --text-secondary: #8888a0;
  --text-dim: #555568;
  --accent-drums: #ff6b4a;
  --accent-bass: #4aadff;
  --accent-melody: #b44aff;
  --accent-chords: #4affb4;
  --accent-fx: #ffcc4a;
  --glow-drums: #ff6b4a33;
  --glow-bass: #4aadff33;
  --glow-melody: #b44aff33;
  --glow-chords: #4affb433;
  --radius-s: 6px;
  --radius-m: 8px;
  --radius-l: 12px;
}

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

body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== HEADER ===== */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent-melody), var(--accent-drums));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  color: white;
}

.logo-text {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.logo-text span {
  color: var(--text-dim);
  font-weight: 400;
  font-size: 12px;
  margin-left: 8px;
}

.transport {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* ===== BUTTONS ===== */

.btn {
  padding: 7px 16px;
  border-radius: var(--radius-m);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-primary);
  font-family: 'Outfit', sans-serif;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
}

.btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
}

.btn:disabled {
  opacity: 0.5;
  cursor: wait;
}

.btn-play {
  background: linear-gradient(135deg, var(--accent-melody), var(--accent-bass));
  border: none;
  color: white;
  font-weight: 600;
  padding: 7px 24px;
}

.btn-play:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

.btn-play.playing {
  background: linear-gradient(135deg, var(--accent-drums), #ff4444);
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 12px #ff6b4a44; }
  50% { box-shadow: 0 0 22px #ff6b4a66; }
}

/* ===== TEMPO + SCALE CONTROLS ===== */

.tempo-control {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--bg-card);
  border-radius: var(--radius-m);
  border: 1px solid var(--border);
}

.tempo-control label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  font-weight: 600;
}

.tempo-control input {
  width: 48px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  font-weight: 500;
  text-align: center;
  outline: none;
}

.tempo-control input::-webkit-inner-spin-button,
.tempo-control input::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.scale-row {
  display: flex;
  gap: 6px;
  align-items: center;
}

.scale-select {
  padding: 5px 10px;
  border-radius: var(--radius-s);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-family: 'Outfit', sans-serif;
  font-size: 13px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s;
}

.scale-select:focus {
  border-color: var(--border-active);
}

/* ===== PRESETS ROW ===== */

.presets-row {
  display: flex;
  gap: 6px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}

.presets-row::-webkit-scrollbar { display: none; }

.preset-chip {
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
  flex-shrink: 0;
}

.preset-chip:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.preset-chip.active {
  background: var(--bg-elevated);
  border-color: var(--accent-melody);
  color: var(--text-primary);
}

/* ===== MAIN LAYOUT ===== */

.main {
  display: flex;
  height: calc(100vh - 97px);
}

/* ===== TRACKS PANEL ===== */

.tracks-panel {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-active) transparent;
}

.tracks-panel::-webkit-scrollbar {
  width: 6px;
}

.tracks-panel::-webkit-scrollbar-thumb {
  background: var(--border-active);
  border-radius: 3px;
}

/* ===== TRACK CARD ===== */

.track-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  overflow: hidden;
  transition: border-color 0.2s;
}

.track-card:hover {
  border-color: var(--border-active);
}

.track-card.active {
  border-color: var(--border-active);
}

.track-header {
  display: flex;
  align-items: center;
  padding: 10px 14px;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  transition: background 0.1s;
}

.track-header:hover {
  background: var(--bg-card-hover);
}

.track-color {
  width: 4px;
  height: 28px;
  border-radius: 2px;
  flex-shrink: 0;
}

.track-name {
  font-weight: 600;
  font-size: 14px;
  flex: 1;
}

.track-event-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  flex-shrink: 0;
}

.track-controls-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.track-btn {
  width: 26px;
  height: 26px;
  border-radius: var(--radius-s);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.12s;
}

.track-btn:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-active);
}

.track-btn.muted {
  opacity: 0.3;
}

.track-body {
  padding: 0 14px 14px;
  display: none;
}

.track-card.active .track-body {
  display: block;
}

/* ===== SECTION LABELS ===== */

.section-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-dim);
  font-weight: 600;
  margin-bottom: 6px;
  margin-top: 10px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.canvas-hint {
  font-size: 9px;
  text-transform: none;
  letter-spacing: 0.2px;
  color: var(--text-dim);
  opacity: 0.5;
  font-weight: 400;
}

/* ===== CANVAS PIANO ROLL ===== */

.canvas-container {
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  margin-bottom: 8px;
}

.canvas-container canvas {
  display: block;
  width: 100%;
}

/* ===== GRID RESOLUTION SELECTOR ===== */

.grid-res-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}

.grid-res-chip {
  padding: 3px 10px;
  border-radius: var(--radius-s);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.12s;
}

.grid-res-chip:hover {
  border-color: var(--border-active);
  color: var(--text-secondary);
}

.grid-res-chip.active {
  background: var(--bg-elevated);
  border-color: var(--border-active);
  color: var(--text-primary);
}

/* ===== SOUND SELECTOR ===== */

.sound-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 8px;
}

.sound-chip {
  padding: 4px 11px;
  border-radius: var(--radius-s);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 12px;
  font-family: 'JetBrains Mono', monospace;
  cursor: pointer;
  transition: all 0.12s;
}

.sound-chip:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.sound-chip.selected {
  border-color: transparent;
  color: white;
}

/* ===== SLIDERS ===== */

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.slider-label {
  font-size: 12px;
  color: var(--text-secondary);
  width: 72px;
  flex-shrink: 0;
  font-weight: 500;
}

.slider-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  width: 40px;
  text-align: right;
  flex-shrink: 0;
}

input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 3px;
  border-radius: 2px;
  background: var(--border);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--text-primary);
  cursor: pointer;
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--text-primary);
  cursor: pointer;
  border: none;
}

/* ===== TRANSFORMS ===== */

.transform-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 8px;
}

.transform-chip {
  padding: 4px 11px;
  border-radius: var(--radius-s);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  cursor: pointer;
  transition: all 0.12s;
}

.transform-chip:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.transform-chip.active {
  background: var(--bg-elevated);
  border-color: var(--border-active);
  color: var(--text-primary);
}

/* ===== CHORD PICKER (floating) ===== */

.chord-picker {
  position: fixed;
  z-index: 200;
  background: var(--bg-elevated);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-m);
  padding: 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  max-width: 220px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
}

.chord-picker-item {
  padding: 4px 10px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.1s;
}

.chord-picker-item:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.chord-picker-item.active {
  background: var(--accent-chords);
  color: #000;
  font-weight: 600;
}

/* ===== CODE PANEL ===== */

.code-panel {
  width: 360px;
  background: var(--bg-surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.code-panel-header {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.code-panel-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-dim);
  font-weight: 600;
}

.code-output {
  flex: 1;
  padding: 14px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-active) transparent;
}

.code-output::-webkit-scrollbar {
  width: 5px;
}

.code-output::-webkit-scrollbar-thumb {
  background: var(--border-active);
  border-radius: 3px;
}

.code-output pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
}

.code-output .keyword { color: var(--accent-melody); }
.code-output .string { color: var(--accent-chords); }
.code-output .number { color: var(--accent-drums); }
.code-output .function { color: var(--accent-bass); }

/* ===== ADD TRACK BUTTON ===== */

.add-track-btn {
  padding: 12px;
  border-radius: var(--radius-l);
  border: 2px dashed var(--border);
  background: transparent;
  color: var(--text-dim);
  font-family: 'Outfit', sans-serif;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.add-track-btn:hover {
  border-color: var(--border-active);
  color: var(--text-secondary);
  background: var(--bg-card);
}

/* ===== LOADING OVERLAY ===== */

.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-deep);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity 0.4s;
}

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

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent-melody);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  margin-top: 14px;
  color: var(--text-secondary);
  font-size: 13px;
}

/* ===== RESPONSIVE ===== */

@media (max-width: 960px) {
  .code-panel { display: none; }

  .main { height: calc(100vh - 97px); }

  .header {
    flex-wrap: wrap;
    gap: 8px;
  }

  .logo-text span { display: none; }

  .transport {
    width: 100%;
    justify-content: flex-end;
  }
}

@media (max-width: 600px) {
  .header { padding: 10px 12px; }
  .tracks-panel { padding: 10px; }
  .presets-row { padding: 8px 12px; }

  .track-header { padding: 8px 10px; }
  .track-body { padding: 0 10px 10px; }

  .transport { gap: 6px; }
  .btn { padding: 6px 12px; font-size: 12px; }
  .btn-play { padding: 6px 18px; }

  .slider-label { width: 56px; font-size: 11px; }

  .canvas-hint { display: none; }
}