/* Professional Minimalist Design System */
:root {
  --color-bg: #090b0d;
  --color-panel: #111418;
  --color-panel-glass: rgba(17, 20, 24, 0.75);
  --color-border: rgba(255, 255, 255, 0.07);
  --color-border-active: rgba(255, 255, 255, 0.15);
  
  --color-text-primary: #f1f3f5;
  --color-text-muted: #868e96;
  --color-text-dim: #5c636a;
  
  /* Muted Elegant Accents (No Neon) */
  --color-accent: #6f9c78; /* Muted Emerald Sage */
  --color-accent-hover: #83b08c;
  --color-accent-bg: rgba(111, 156, 120, 0.12);
  --color-accent-active: #a1c7aa;
  
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-ui);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-bg);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

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

.loader-card {
  width: 100%;
  max-width: 420px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.loader-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.loader-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.progress-container {
  width: 100%;
}

.loader-cta {
  margin-top: 28px;
  width: 100%;
  display: flex;
  justify-content: center;
}

.loader-heart-notice {
  margin-top: 16px;
  width: 100%;
  display: flex;
  justify-content: center;
}

.loader-heart-notice a {
  font-size: 0.72rem;
  color: var(--color-accent-hover);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.loader-heart-notice a:hover {
  color: var(--color-accent-active);
  transform: translateY(-1px);
}

.heart-notice {
  margin-top: 4px;
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  display: flex;
  justify-content: center;
}

.heart-notice a {
  font-size: 0.72rem;
  color: var(--color-accent-hover);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.heart-notice a:hover {
  color: var(--color-accent-active);
  transform: translateY(-1px);
}

.progress-bar {
  width: 100%;
  height: 4px;
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 12px;
}

#loadProgress {
  display: block;
  width: 0%;
  height: 100%;
  background-color: var(--color-accent);
  transition: width 0.2s ease;
}

.progress-details {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

/* Dashboard Shell */
.dashboard-shell {
  flex: 1;
  max-width: 1500px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  height: 100vh;
  max-height: 100vh;
}

/* App Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}



.brand h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.2;
}

.brand p {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.header-status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: rgba(255, 255, 255, 0.03);
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 500;
}

.cta-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-accent-bg);
  border: 1px solid var(--color-accent);
  color: var(--color-accent-active);
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-normal);
  box-shadow: 0 0 8px rgba(111, 156, 120, 0.15);
  animation: badgePulse 3s infinite ease-in-out;
}

.cta-link-badge:hover {
  background-color: var(--color-accent);
  color: #0f1511;
  box-shadow: 0 0 16px rgba(111, 156, 120, 0.45);
  transform: translateY(-1px);
}

.cta-link-badge svg {
  transition: transform var(--transition-fast);
}

.cta-link-badge:hover svg {
  transform: translate(1px, -1px);
}

@keyframes badgePulse {
  0% {
    box-shadow: 0 0 8px rgba(111, 156, 120, 0.15);
    border-color: rgba(111, 156, 120, 0.6);
  }
  50% {
    box-shadow: 0 0 14px rgba(111, 156, 120, 0.4);
    border-color: var(--color-accent);
  }
  100% {
    box-shadow: 0 0 8px rgba(111, 156, 120, 0.15);
    border-color: rgba(111, 156, 120, 0.6);
  }
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-text-dim);
  transition: background-color var(--transition-fast);
}

.status-dot.playing {
  background-color: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent);
}

.status-dot.buffering {
  background-color: #d9a75d; /* Muted Gold */
  animation: pulse 1.5s infinite;
}

/* Dashboard Layout */
.dashboard-content {
  flex: 1;
  display: grid;
  grid-template-columns: 240px 1fr 240px;
  gap: 20px;
  min-height: 0;
  width: 100%;
}

/* Panels */
.visualizer-panel {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
  flex: 1;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-header h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.hud-stats {
  display: flex;
  gap: 24px;
  align-items: center;
}

.hud-item {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.hud-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-dim);
}

.hud-value {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 500;
}

.visualizer-container {
  flex: 1;
  background-color: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.03);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
  min-height: 250px;
}

#noteCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

.queue-hud-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 110px;
}

.queue-hud-row {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  margin-top: 2px;
}

.queue-hud-row .readout-progress {
  width: 60px;
  height: 4px;
  background-color: rgba(255, 255, 255, 0.04);
  border-radius: 2px;
  overflow: hidden;
}

.queue-hud-row #queueFill {
  display: block;
  width: 0%;
  height: 100%;
  background-color: var(--color-accent);
  transition: width 0.15s ease;
}

/* Controls Panel Bottom */
.main-column {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

.sidebar-column {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
  overflow-y: auto;
  max-height: 100%;
  padding-right: 4px;
}

/* Custom Scrollbar for Sidebar Column */
.sidebar-column::-webkit-scrollbar {
  width: 4px;
}
.sidebar-column::-webkit-scrollbar-track {
  background: transparent;
}
.sidebar-column::-webkit-scrollbar-thumb {
  background-color: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
}
.sidebar-column::-webkit-scrollbar-thumb:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

.info-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.info-card {
  background-color: var(--color-panel);
  border: 1px dashed var(--color-border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.info-card h5 {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 6px;
  margin-bottom: 4px;
}

.info-card p {
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--color-text-muted);
}

/* Controls Panel Bottom */
.controls-panel-bottom {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.controls-main-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.playback-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.playback-actions button {
  flex-shrink: 0;
}

.seeding-group {
  display: flex;
  align-items: center;
}

.settings-dropdown, .playing-style-panel {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background-color: var(--color-panel);
  padding: 16px;
  transition: background-color var(--transition-fast);
}

.settings-dropdown[open] {
  background-color: var(--color-panel);
}

.settings-dropdown summary {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  cursor: pointer;
  outline: none;
  user-select: none;
  transition: color var(--transition-fast);
  list-style: none; /* Hide default arrow */
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.settings-dropdown summary::-webkit-details-marker {
  display: none; /* Hide default arrow in Safari */
}

.settings-dropdown summary::after {
  content: '+';
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-text-dim);
}

.settings-dropdown[open] summary::after {
  content: '−';
}

.settings-dropdown summary:hover {
  color: var(--color-text-primary);
}

.settings-vertical-stack {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 16px;
}

.settings-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.settings-column h5 {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 6px;
  margin-bottom: 4px;
}

button {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  height: 42px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 16px;
  white-space: nowrap;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.35 !important;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #0f1511;
  border: none;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
}

.btn-primary:active:not(:disabled) {
  background-color: var(--color-accent-active);
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: var(--color-border-active);
}

/* Subtle attention styling for New Song button */
#newSongBtn {
  border-color: rgba(111, 156, 120, 0.25);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#newSongBtn:not(:disabled) {
  animation: newSongPulse 3.5s infinite ease-in-out;
}

#newSongBtn:hover:not(:disabled) {
  animation: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 16px rgba(111, 156, 120, 0.4);
  background-color: rgba(111, 156, 120, 0.25);
}

#newSongBtn svg {
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

#newSongBtn:hover:not(:disabled) svg {
  transform: rotate(360deg);
}

@keyframes newSongPulse {
  0% {
    border-color: rgba(111, 156, 120, 0.25);
    box-shadow: 0 0 0px rgba(111, 156, 120, 0);
    background-color: rgba(255, 255, 255, 0.04);
  }
  50% {
    border-color: rgba(111, 156, 120, 0.85);
    box-shadow: 0 0 12px rgba(111, 156, 120, 0.3);
    background-color: rgba(111, 156, 120, 0.16);
  }
  100% {
    border-color: rgba(111, 156, 120, 0.25);
    box-shadow: 0 0 0px rgba(111, 156, 120, 0);
    background-color: rgba(255, 255, 255, 0.04);
  }
}

/* Sliders */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

/* Slider Thumb */
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-text-primary);
  border: 2px solid var(--color-bg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  background: var(--color-accent);
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-text-primary);
  border: 2px solid var(--color-bg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.15);
  background: var(--color-accent);
}

/* Advanced Configuration */
.advanced-details {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.advanced-details summary {
  font-size: 0.78rem;
  color: var(--color-text-dim);
  cursor: pointer;
  user-select: none;
  outline: none;
  transition: color var(--transition-fast);
}

.advanced-details summary:hover {
  color: var(--color-text-muted);
}

.advanced-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 12px;
}

.input-file-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.input-file-group label {
  font-size: 0.72rem;
  color: var(--color-text-muted);
}

input[type="file"] {
  font-size: 0.72rem;
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 6px 8px;
  color: var(--color-text-muted);
  outline: none;
}

input[type="file"]::file-selector-button {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-text-primary);
  padding: 2px 8px;
  margin-right: 8px;
  cursor: pointer;
  font-size: 0.68rem;
}

.advanced-info {
  font-size: 0.68rem;
  color: var(--color-text-dim);
  font-style: italic;
}

/* Select Dropdown & Seeding Style overrides */
.select-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.select-group label {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

select {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  height: 38px;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text-primary);
  padding: 0 10px;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

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

select option {
  background-color: #111418;
  color: #f1f3f5;
}

/* Custom Pretty Select Dropdown styles */
.custom-select-container {
  position: relative;
  width: 100%;
}

.custom-select-container select {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0 36px 0 14px;
  height: 42px;
  outline: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.custom-select-container select:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--color-border-active);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.08);
}

.custom-select-container select:focus {
  border-color: var(--color-emerald-accent);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.12);
}

/* Custom Chevron Indicator */
.custom-select-container::after {
  content: "";
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 5px;
  background-color: var(--color-text-muted);
  clip-path: polygon(100% 0, 0 0, 50% 100%);
  pointer-events: none;
  transition: background-color var(--transition-fast);
}

.custom-select-container:hover::after {
  background-color: var(--color-emerald-accent);
}

.midi-seed-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background-color: rgba(255, 255, 255, 0.01);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px;
}

.midi-info-text {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.midi-info-subtext {
  font-size: 0.72rem;
  color: var(--color-text-dim);
  margin-top: 4px;
}

/* Pulse Animation */
@keyframes pulse {
  0% { opacity: 0.5; }
  50% { opacity: 1; }
  100% { opacity: 0.5; }
}

/* Mobile Compatibility & Responsiveness */
@media (max-width: 840px) {
  .cta-extra-text {
    display: none;
  }
  
  .dashboard-shell {
    height: auto;
    max-height: none;
    overflow-y: auto;
    padding: 16px;
    gap: 16px;
  }
  
  .main-column {
    order: 1;
  }

  .sidebar-column {
    order: 2;
    display: flex;
    flex-direction: column;
  }
  
  .sidebar-column .settings-dropdown {
    order: 2;
  }
  
  .sidebar-column .playing-style-panel {
    order: 1;
  }

  .sidebar-spacer {
    order: 3;
  }
  
  .dashboard-content {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 0;
  }
  
  .visualizer-panel {
    height: auto;
    flex: none;
  }
  
  .visualizer-container {
    height: 300px;
    min-height: 250px;
  }
  
  .controls-main-row {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  
  .playback-actions {
    width: 100%;
  }
  
  .playback-actions button {
    flex: 1;
  }
  
  .seeding-group {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .settings-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .hud-stats {
    flex-wrap: wrap;
    gap: 12px;
  }
}

@media (max-width: 480px) {
  .loader-card {
    padding: 28px 20px;
  }
  
  .app-header {
    padding-bottom: 12px;
  }

  .app-header h2 {
    font-size: 1.1rem;
  }
  
  .visualizer-panel {
    padding: 12px;
    height: auto;
    gap: 12px;
  }
  
  .panel-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .hud-stats {
    width: 100%;
    justify-content: space-between;
  }
}

/* MIDI Timeline & Seeding Selections */
.midi-timeline {
  display: flex;
  gap: 3px;
  height: 52px;
  background-color: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 6px 8px 14px 8px; /* Bottom padding accommodates bar labels */
  overflow-x: auto;
  align-items: flex-end;
  margin-bottom: 8px;
  margin-top: 4px;
}

/* Custom Scrollbar for Timeline */
.midi-timeline::-webkit-scrollbar {
  height: 4px;
}
.midi-timeline::-webkit-scrollbar-track {
  background: transparent;
}
.midi-timeline::-webkit-scrollbar-thumb {
  background-color: rgba(255, 255, 255, 0.08);
  border-radius: 10px;
}

.timeline-bar-col {
  flex: 1;
  min-width: 10px;
  max-width: 24px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  cursor: pointer;
  position: relative;
  border-radius: 3px;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.timeline-bar-col:hover {
  background-color: rgba(255, 255, 255, 0.04);
  transform: translateY(-1px);
}

.density-fill {
  width: 100%;
  background-color: var(--color-text-dim);
  border-radius: 1.5px;
  transition: background-color var(--transition-fast), height var(--transition-normal);
}

/* Warm-up context window styling */
.timeline-bar-col.in-warmup {
  background-color: rgba(111, 156, 120, 0.08);
}
.timeline-bar-col.in-warmup .density-fill {
  background-color: var(--color-accent); /* Soft sage green */
}

/* Selected Bar styling */
.timeline-bar-col.is-selected {
  background-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.3);
}
.timeline-bar-col.is-selected .density-fill {
  background-color: var(--color-text-primary); /* Solid white */
}

/* Label for bar number */
.timeline-bar-col::after {
  content: attr(data-bar-label);
  position: absolute;
  bottom: -11px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.58rem;
  color: var(--color-text-dim);
  pointer-events: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
  white-space: nowrap;
  opacity: 0;
}

.timeline-bar-col.labeled::after {
  opacity: 0.6;
}

.timeline-bar-col:hover::after {
  opacity: 1;
  color: var(--color-text-primary);
}

/* Segmented Toggle Control Group */
.toggle-group-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toggle-group-label {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.toggle-group {
  display: flex;
  background-color: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 3px;
  gap: 2px;
}

#seedSourceGroup.toggle-group {
  flex-direction: column;
  gap: 8px;
  background-color: transparent;
  border: none;
  padding: 0;
}

#seedSourceGroup.toggle-group .toggle-btn {
  height: 42px;
  font-size: 0.85rem;
  border: 1px solid var(--color-border);
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--color-text-muted);
  justify-content: flex-start;
  padding: 0 16px;
  position: relative;
  transition: all var(--transition-normal);
  overflow: hidden;
}

.rec-tag {
  font-size: 0.55rem;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background-color: rgba(111, 156, 120, 0.08);
  color: var(--color-accent);
  border: 1px solid rgba(111, 156, 120, 0.25);
  padding: 2px 5px;
  border-radius: 3px;
  font-weight: 600;
  margin-left: auto;
  transition: all var(--transition-fast);
}

#seedSourceGroup.toggle-group .toggle-btn:hover:not(:disabled) .rec-tag,
#seedSourceGroup.toggle-group .toggle-btn.active .rec-tag {
  background-color: var(--color-accent);
  color: #0f1511;
  border-color: var(--color-accent);
}

#seedSourceGroup.toggle-group .toggle-btn:hover:not(:disabled) {
  color: var(--color-text-primary);
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--color-border-active);
  transform: translateX(3px);
}

#seedSourceGroup.toggle-group .toggle-btn.active {
  background-color: var(--color-accent-bg);
  color: var(--color-text-primary);
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(111, 156, 120, 0.12);
}

#seedSourceGroup.toggle-group .toggle-btn::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--color-accent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

#seedSourceGroup.toggle-group .toggle-btn.active::before {
  opacity: 1;
}

#seedSourceGroup.toggle-group .toggle-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

.toggle-group .toggle-btn {
  flex: 1;
  height: 34px;
  font-size: 0.8rem;
  font-weight: 500;
  border: none;
  background-color: transparent;
  color: var(--color-text-muted);
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  padding: 0 16px;
}

.toggle-group .toggle-btn:hover:not(:disabled) {
  color: var(--color-text-primary);
  background-color: rgba(255, 255, 255, 0.02);
}

.toggle-group .toggle-btn.active {
  background-color: var(--color-accent);
  color: #0f1511;
}

.toggle-group .toggle-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.timeline-bar-col.disabled {
  opacity: 0.25;
  cursor: not-allowed;
  pointer-events: none;
}

/* Active Recording Styling */
.btn-recording {
  border-color: rgba(217, 83, 79, 0.4) !important;
  background-color: rgba(217, 83, 79, 0.08) !important;
  color: #f1f3f5 !important;
}

.btn-recording:hover:not(:disabled) {
  background-color: rgba(217, 83, 79, 0.15) !important;
}

@keyframes recordPulse {
  0% { opacity: 0.4; }
  50% { opacity: 1; }
  100% { opacity: 0.4; }
}

.pulse-record {
  animation: recordPulse 1.5s infinite;
}