/* OGLE Variable Star Sonifier - Professional Dark Astronomy Theme */

:root {
  --bg-main: #0d1117;
  --bg-card: #161b22;
  --bg-sidebar: #0b0e14;
  --bg-dark: #07090e;
  --border-color: #30363d;
  --text-main: #f0f6fc;
  --text-muted: #8b949e;
  --accent-cyan: #58a6ff;
  --accent-magenta: #bc8cff;
  --accent-green: #238636;
  --accent-green-hover: #2ea043;
  --accent-orange: #d29922;
  --plot-obs: #58a6ff;
  --plot-line: #bc8cff;
  --plot-raw: #f778ba;

  /* Multi-Survey Epoch Color Tokens */
  --survey-o2: #f0883e;
  --survey-o2-bg: rgba(240, 136, 62, 0.18);
  --survey-o2-border: rgba(240, 136, 62, 0.4);

  --survey-o3: #bc8cff;
  --survey-o3-bg: rgba(188, 140, 255, 0.18);
  --survey-o3-border: rgba(188, 140, 255, 0.4);

  --survey-o4: #58a6ff;
  --survey-o4-bg: rgba(88, 166, 255, 0.18);
  --survey-o4-border: rgba(88, 166, 255, 0.4);

  --plot-ghost: rgba(139, 148, 158, 0.16);
  --plot-ghost-line: rgba(88, 166, 255, 0.28);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  height: 100vh;
  overflow: hidden;
}

.mono {
  font-family: 'JetBrains Mono', monospace;
}

.app-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header */
.app-header {
  height: 42px;
  background-color: var(--bg-sidebar);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
  flex-shrink: 0;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 18px;
}

.brand-text h1 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.2px;
}

.brand-text .subtitle {
  font-size: 11px;
  color: var(--text-muted);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #8b949e;
}

.status-indicator.live {
  background-color: #2ea043;
  box-shadow: 0 0 8px rgba(46, 160, 67, 0.6);
}

/* App Main Container */
.main-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 320px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.sidebar-header h2 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.sidebar-title-link {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}

.sidebar-title-link:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
}

.badge {
  background-color: rgba(88, 166, 255, 0.15);
  color: var(--accent-cyan);
  font-size: 10.5px;
  padding: 2px 7px;
  border-radius: 12px;
  font-family: 'JetBrains Mono', monospace;
}

.filter-card {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.filter-group label {
  font-size: 10.5px;
  font-weight: 500;
  color: var(--text-muted);
}

select, input[type="text"], input[type="number"] {
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-main);
  font-size: 11.5px;
  padding: 5px 8px;
  outline: none;
  transition: border-color 0.15s ease;
}

select:focus, input[type="text"]:focus, input[type="number"]:focus {
  border-color: var(--accent-cyan);
}

.range-inputs {
  display: flex;
  align-items: center;
  gap: 6px;
}

.range-inputs input {
  width: 100%;
}

.range-inputs span {
  font-size: 11px;
  color: var(--text-muted);
}

.search-input-wrap {
  display: flex;
  gap: 6px;
}

.search-input-wrap input {
  flex: 1;
}

.icon-btn {
  background-color: var(--border-color);
  color: var(--text-main);
  border: none;
  border-radius: 6px;
  padding: 0 10px;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.icon-btn:hover {
  background-color: #3d444d;
}

/* Star List */
.star-list-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.star-list-header {
  padding: 6px 14px;
  background-color: rgba(22, 27, 34, 0.5);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  font-size: 10.5px;
  color: var(--text-muted);
}

.star-list {
  flex: 1;
  overflow-y: auto;
}

.star-list-item {
  padding: 8px 14px;
  border-bottom: 1px solid rgba(48, 54, 61, 0.4);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.star-list-item:hover {
  background-color: rgba(48, 54, 61, 0.3);
}

.star-list-item.selected {
  background-color: rgba(88, 166, 255, 0.12);
  border-left: 3px solid var(--accent-cyan);
}

.star-item-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.star-item-id {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-cyan);
}

.star-item-subtype {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  background-color: rgba(188, 140, 255, 0.15);
  color: var(--accent-magenta);
}

.star-item-bottom {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
}

.loading-spinner {
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

.loading-more {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 12px;
  text-align: center;
  color: var(--text-muted);
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
}

.loading-more::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid rgba(88, 166, 255, 0.2);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spinner-spin 0.8s linear infinite;
}

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

/* Main Panel */
.main-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 8px 16px;
  gap: 8px;
  overflow-y: auto;
  background-color: var(--bg-dark);
}

/* Star Info Card */
.star-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 14px;
  box-sizing: border-box;
  flex-shrink: 0;
}

.star-card-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.star-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
}

.star-title-group h2 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.3px;
  font-family: 'JetBrains Mono', monospace;
  margin: 0;
  line-height: 1.2;
  white-space: nowrap;
}

.star-type-badge {
  background-color: rgba(88, 166, 255, 0.15);
  color: var(--accent-cyan);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.star-coords {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  margin-bottom: 0;
  font-family: 'JetBrains Mono', monospace;
  white-space: nowrap;
}

.star-quick-metrics {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  flex-shrink: 0;
  padding-top: 0;
}

.metric-item {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.metric-label {
  font-size: 10px;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.metric-value {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-main);
}

/* Epoch and Period Explorer Cards (Separate panels) */
.epoch-card,
.period-card,
.period-explorer-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  flex-shrink: 0;
}

/* Card Divider */
.card-divider {
  display: none;
}

/* ==========================================================================
   Observation Epoch / Time-Range Explorer Styles
   ========================================================================== */

/* Epoch Explorer Section */
.epoch-explorer-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.epoch-explorer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: nowrap;
  gap: 10px;
}

.epoch-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Live Range Readout Badge */
.epoch-readout-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.2px;
  background: rgba(88, 166, 255, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(88, 166, 255, 0.35);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.epoch-readout-badge:hover {
  background: rgba(88, 166, 255, 0.2);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 8px rgba(88, 166, 255, 0.35);
}

.epoch-readout-badge.gap-active {
  background: rgba(210, 153, 34, 0.15);
  color: #d29922;
  border-color: rgba(210, 153, 34, 0.4);
}

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

/* Survey Buttons Group */
.epoch-survey-buttons {
  display: flex;
  align-items: center;
  gap: 4px;
}

.epoch-survey-btn {
  background-color: rgba(33, 38, 45, 0.8);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: 4px;
  padding: 0 7px;
  font-size: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  height: 23px;
  box-sizing: border-box;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.epoch-survey-btn:hover {
  background-color: #30363d;
  color: var(--text-main);
  border-color: #58a6ff;
}

.epoch-survey-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

/* Distinct Active States for Survey Epochs */
.epoch-survey-btn[data-survey="OGLE-II"].active {
  background-color: var(--survey-o2-bg);
  border-color: var(--survey-o2);
  color: #ffa657;
  font-weight: 700;
  box-shadow: 0 0 8px rgba(240, 136, 62, 0.4);
}

.epoch-survey-btn[data-survey="OGLE-III"].active {
  background-color: var(--survey-o3-bg);
  border-color: var(--survey-o3);
  color: #d2a8ff;
  font-weight: 700;
  box-shadow: 0 0 8px rgba(188, 140, 255, 0.4);
}

.epoch-survey-btn[data-survey="OGLE-IV"].active {
  background-color: var(--survey-o4-bg);
  border-color: var(--survey-o4);
  color: #79c0ff;
  font-weight: 700;
  box-shadow: 0 0 8px rgba(88, 166, 255, 0.4);
}

.epoch-survey-btn[data-survey="all"].active {
  background-color: rgba(35, 134, 54, 0.22);
  border-color: var(--accent-green);
  color: #3fb950;
  font-weight: 700;
  box-shadow: 0 0 8px rgba(35, 134, 54, 0.4);
}

/* Auto-Sweep Button */
.epoch-sweep-btn {
  background-color: rgba(48, 54, 61, 0.5);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 4px;
  padding: 0 8px;
  font-size: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  height: 23px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.epoch-sweep-btn:hover {
  background-color: var(--border-color);
  border-color: #58a6ff;
  color: #ffffff;
}

.epoch-sweep-btn.active {
  background-color: rgba(35, 134, 54, 0.25);
  border-color: #3fb950;
  color: #3fb950;
  box-shadow: 0 0 10px rgba(63, 185, 80, 0.4);
}

.epoch-sweep-btn.active .sweep-icon {
  animation: sweep-pulse 1s infinite alternate ease-in-out;
}

@keyframes sweep-pulse {
  from { opacity: 0.6; transform: scale(0.9); }
  to { opacity: 1.0; transform: scale(1.15); }
}

/* Interactive Epoch Slider Track */
.epoch-slider-wrapper {
  position: relative;
  width: 100%;
  padding-top: 2px;
  padding-bottom: 2px;
}

.epoch-track-wrap {
  position: relative;
  width: 100%;
  height: 22px;
  background-color: #07090e;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  overflow: visible;
  display: flex;
  align-items: center;
  box-sizing: border-box;
}

/* Barcode Density Canvas */
.time-density-canvas {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 4px;
  pointer-events: none;
  background-color: transparent;
}

/* Out-of-window dimming curtains */
.time-range-dim {
  position: absolute;
  top: 0;
  bottom: 0;
  background: rgba(7, 9, 14, 0.72);
  pointer-events: none;
  z-index: 2;
  transition: width 0.05s ease;
}

.time-range-dim-left {
  left: 0;
  border-top-left-radius: 5px;
  border-bottom-left-radius: 5px;
}

.time-range-dim-right {
  right: 0;
  border-top-right-radius: 5px;
  border-bottom-right-radius: 5px;
}

/* Middle Draggable Range Fill */
.time-range-fill {
  position: absolute;
  top: -1px;
  bottom: -1px;
  background: rgba(88, 166, 255, 0.16);
  border-top: 2px solid rgba(88, 166, 255, 0.7);
  border-bottom: 2px solid rgba(88, 166, 255, 0.7);
  cursor: grab;
  touch-action: none;
  user-select: none;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s ease;
}

.time-range-fill:hover {
  background: rgba(88, 166, 255, 0.24);
  border-color: var(--accent-cyan);
}

.time-range-fill:active,
.time-range-fill.dragging {
  cursor: grabbing;
  background: rgba(88, 166, 255, 0.32);
  border-color: #ffffff;
  box-shadow: inset 0 0 10px rgba(88, 166, 255, 0.5);
}

/* Grip icon inside fill */
.time-range-grip {
  display: flex;
  gap: 3px;
  align-items: center;
  pointer-events: none;
  opacity: 0.5;
  transition: opacity 0.15s ease;
}

.time-range-fill:hover .time-range-grip,
.time-range-fill.dragging .time-range-grip {
  opacity: 0.9;
}

.grip-bar {
  width: 2px;
  height: 12px;
  background-color: #ffffff;
  border-radius: 1px;
}

/* Dual Slider Thumbs */
.time-thumb {
  position: absolute;
  top: 50%;
  width: 12px;
  height: 26px;
  border-radius: 3px;
  background: linear-gradient(180deg, #58a6ff 0%, #1f6feb 100%);
  border: 2px solid #ffffff;
  box-shadow: 0 0 6px rgba(88, 166, 255, 0.8), 0 2px 4px rgba(0, 0, 0, 0.6);
  cursor: ew-resize;
  touch-action: none;
  user-select: none;
  z-index: 6;
  transform: translate(-50%, -50%);
  box-sizing: border-box;
  transition: transform 0.1s ease, box-shadow 0.15s ease, background 0.15s ease;
}

/* Larger hit target for touch accessibility */
.time-thumb::before {
  content: '';
  position: absolute;
  top: -8px;
  bottom: -8px;
  left: -8px;
  right: -8px;
}

/* Visual Grip Ridges */
.time-thumb::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 2px;
  height: 10px;
  background: rgba(255, 255, 255, 0.85);
  transform: translate(-50%, -50%);
  border-radius: 1px;
}

.time-thumb:hover {
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 0 10px rgba(88, 166, 255, 1.0), 0 0 0 2px rgba(88, 166, 255, 0.35);
}

.time-thumb:active,
.time-thumb.dragging {
  cursor: grabbing;
  transform: translate(-50%, -50%) scale(1.15);
  background: linear-gradient(180deg, #79c0ff 0%, #388bfd 100%);
  box-shadow: 0 0 14px rgba(88, 166, 255, 1.0), 0 0 0 2px rgba(88, 166, 255, 0.5);
}

/* Time Indents Track */
.time-indents-track {
  position: relative;
  width: 100%;
  height: 18px;
  margin-top: 2px;
}

.time-indent-marker {
  position: absolute;
  top: 0;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  user-select: none;
  transition: transform 0.1s ease;
}

.time-indent-marker.edge-left {
  transform: translateX(0);
  align-items: flex-start;
}

.time-indent-marker.edge-right {
  transform: translateX(-100%);
  align-items: flex-end;
}

.time-indent-tick {
  width: 2px;
  height: 5px;
  border-radius: 1px;
  transition: all 0.15s ease;
}

.time-indent-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px;
  font-weight: 500;
  white-space: nowrap;
  margin-top: 1px;
  transition: color 0.15s ease;
}

/* Survey boundary colors */
.time-indent-marker.survey-o2 .time-indent-tick {
  background-color: var(--survey-o2);
  box-shadow: 0 0 4px rgba(240, 136, 62, 0.7);
}
.time-indent-marker.survey-o2 .time-indent-label {
  color: #ffa657;
}

.time-indent-marker.survey-o3 .time-indent-tick {
  background-color: var(--survey-o3);
  box-shadow: 0 0 4px rgba(188, 140, 255, 0.7);
}
.time-indent-marker.survey-o3 .time-indent-label {
  color: #d2a8ff;
}

.time-indent-marker.survey-o4 .time-indent-tick {
  background-color: var(--survey-o4);
  box-shadow: 0 0 4px rgba(88, 166, 255, 0.7);
}
.time-indent-marker.survey-o4 .time-indent-label {
  color: #79c0ff;
}

.time-indent-marker.survey-latest .time-indent-tick {
  background-color: #8b949e;
}
.time-indent-marker.survey-latest .time-indent-label {
  color: var(--text-muted);
}

.time-indent-marker:hover .time-indent-label {
  color: #ffffff;
  font-weight: 700;
}

/* Magnetic Snapped State */
.time-indent-marker.snapped .time-indent-tick {
  background-color: #ffffff;
  height: 11px;
  width: 3.5px;
  box-shadow: 0 0 8px #ffffff, 0 0 4px currentColor;
  transform: scale(1.15);
}

.time-indent-marker.snapped .time-indent-label {
  color: #ffffff;
  font-weight: 800;
  text-shadow: 0 0 6px currentColor;
}

.period-explorer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: nowrap;
  gap: 10px;
}

.period-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: nowrap;
}

.explorer-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  font-weight: 600;
}

.period-input-wrap {
  display: flex;
  align-items: center;
  gap: 4px;
}

.period-input-wrap input {
  background-color: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--accent-cyan);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 6px;
  width: 110px;
  height: 24px;
  box-sizing: border-box;
  outline: none;
}

.period-input-wrap input:focus {
  border-color: var(--accent-cyan);
}

.period-input-wrap.focus-p1 input {
  border-color: #bc8cff;
  color: #d2a8ff;
  box-shadow: 0 0 8px rgba(188, 140, 255, 0.35);
}

.period-input-wrap.focus-p1 input:focus {
  border-color: #bc8cff;
  box-shadow: 0 0 12px rgba(188, 140, 255, 0.5);
}

.period-input-wrap.focus-p2 input {
  border-color: #f0883e;
  color: #ffa657;
  box-shadow: 0 0 8px rgba(240, 136, 62, 0.35);
}

.period-input-wrap.focus-p2 input:focus {
  border-color: #f0883e;
  box-shadow: 0 0 12px rgba(240, 136, 62, 0.5);
}

.period-input-wrap .unit {
  font-size: 11px;
  color: var(--text-muted);
}

.nudge-btn {
  background-color: var(--border-color);
  color: var(--text-main);
  border: none;
  border-radius: 4px;
  width: 22px;
  height: 24px;
  font-size: 12px;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s ease;
}

.nudge-btn:hover {
  background-color: #3d444d;
}

.drift-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 6px;
  border-radius: 12px;
  font-family: var(--font-mono, monospace);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2px;
  height: 22px;
  box-sizing: border-box;
  background: rgba(110, 118, 129, 0.15);
  color: #8b949e;
  border: 1px solid rgba(110, 118, 129, 0.3);
  margin-left: 4px;
  cursor: help;
  user-select: none;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.drift-badge.in-phase {
  background: rgba(63, 185, 80, 0.15);
  color: #3fb950;
  border-color: rgba(63, 185, 80, 0.35);
}

.drift-badge.subtle {
  background: rgba(88, 166, 255, 0.15);
  color: #58a6ff;
  border-color: rgba(88, 166, 255, 0.35);
}

.drift-badge.warning {
  background: rgba(210, 153, 34, 0.15);
  color: #d29922;
  border-color: rgba(210, 153, 34, 0.35);
}

.drift-badge.smeared {
  background: rgba(248, 81, 73, 0.18);
  color: #f85149;
  border-color: rgba(248, 81, 73, 0.4);
}

.period-mode-buttons {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
}

.period-mode-btn {
  background-color: rgba(33, 38, 45, 0.8);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: 4px;
  padding: 0 8px;
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  height: 24px;
  box-sizing: border-box;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.period-mode-btn:hover {
  background-color: #30363d;
  color: var(--text-main);
  border-color: #58a6ff;
}

.period-mode-btn.primary.active {
  background-color: rgba(88, 166, 255, 0.2);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  font-weight: 700;
  box-shadow: 0 0 8px rgba(88, 166, 255, 0.35);
}

.period-mode-btn.secondary {
  border-color: rgba(240, 136, 62, 0.4);
  color: #ffa657;
}

.period-mode-btn.secondary:hover {
  background-color: rgba(240, 136, 62, 0.15);
  border-color: #f0883e;
  color: #ffffff;
}

.period-mode-btn.secondary.active {
  background-color: rgba(240, 136, 62, 0.22);
  border-color: #f0883e;
  color: #ffa657;
  font-weight: 700;
  box-shadow: 0 0 8px rgba(240, 136, 62, 0.4);
}

.period-mode-btn.poly-btn {
  border-color: rgba(188, 140, 255, 0.4);
  color: #d2a8ff;
  font-weight: 600;
  margin-left: 6px;
  position: relative;
}

.period-mode-btn.poly-btn:hover {
  background-color: rgba(188, 140, 255, 0.15);
  border-color: var(--accent-magenta);
  color: #ffffff;
}

.period-mode-btn.poly-btn.active {
  background-color: rgba(188, 140, 255, 0.22);
  border-color: var(--accent-magenta);
  color: #d2a8ff;
  font-weight: 700;
  box-shadow: 0 0 10px rgba(188, 140, 255, 0.4);
}

.period-mode-btn.fm-btn {
  border-color: rgba(247, 120, 186, 0.4);
  color: #f778ba;
  font-weight: 600;
  transition: all 0.15s ease;
}

.period-mode-btn.fm-btn:hover {
  background-color: rgba(247, 120, 186, 0.15);
  border-color: #f778ba;
  color: #ff9bce;
}

.period-mode-btn.fm-btn.active {
  background-color: rgba(247, 120, 186, 0.25);
  border-color: #f778ba;
  color: #ff9bce;
  font-weight: 700;
  box-shadow: 0 0 10px rgba(247, 120, 186, 0.45);
}

/* Disabled styling when polyphonic locks period to published ratios */
.period-slider-wrapper.disabled {
  opacity: 0.35;
  pointer-events: none;
  filter: grayscale(0.8);
  cursor: not-allowed;
}

.period-input-wrap.disabled input {
  opacity: 0.45;
  cursor: not-allowed;
  background-color: rgba(22, 27, 34, 0.6);
  border-color: rgba(48, 54, 61, 0.5);
  color: var(--text-muted);
}

.period-input-wrap.disabled .nudge-btn {
  opacity: 0.3;
  pointer-events: none;
  cursor: not-allowed;
}

.period-input-wrap.disabled .drift-badge {
  opacity: 0.4;
}

.fm-legend-tag {
  font-size: 11px;
  color: #f778ba;
  font-weight: 600;
  margin-left: 6px;
}

/* Slider Track & Indents */
.period-slider-wrapper {
  position: relative;
  width: 100%;
  padding-top: 2px;
  padding-bottom: 2px;
}

.slider-track-wrap {
  position: relative;
  width: 100%;
  height: 16px;
  display: flex;
  align-items: center;
}

#period-scrub-slider {
  width: 100%;
  height: 8px;
  margin: 0;
  padding: 0;
  background: #21262d;
  border-radius: 4px;
  outline: none;
  cursor: pointer;
  position: relative;
  z-index: 3;
  -webkit-appearance: none;
  appearance: none;
  display: block;
}

#period-scrub-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(88, 166, 255, 0.8);
  border: 2px solid #ffffff;
  transition: transform 0.1s ease;
}

#period-scrub-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

#period-scrub-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(88, 166, 255, 0.8);
  border: 2px solid #ffffff;
  transition: transform 0.1s ease;
}

/* Multi-Handle Slider for Polyphonic & FM Synthesis */
.period-slider-wrapper.multi-mode #period-scrub-slider::-webkit-slider-thumb {
  opacity: 0;
  pointer-events: none;
}

.period-slider-wrapper.multi-mode #period-scrub-slider::-moz-range-thumb {
  opacity: 0;
  pointer-events: none;
}

.multi-thumb-track {
  position: absolute;
  top: 0;
  left: 9px;
  width: calc(100% - 18px);
  height: 20px;
  pointer-events: none;
  z-index: 6;
}

.multi-thumb {
  position: absolute;
  top: 50%;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  cursor: grab;
  touch-action: none;
  user-select: none;
  pointer-events: auto;
  transform: translate(-50%, -50%);
  border: 2px solid #ffffff;
  box-sizing: border-box;
  transition: transform 0.1s ease, box-shadow 0.15s ease;
}

.multi-thumb:hover {
  transform: translate(-50%, -50%) scale(1.15);
}

.multi-thumb:active,
.multi-thumb.dragging {
  cursor: grabbing;
  transform: translate(-50%, -50%) scale(1.22);
}

/* Mode 1 Thumb (P1, Purple / FM Carrier) */
.multi-thumb.thumb-p1 {
  background: #bc8cff;
  box-shadow: 0 0 10px rgba(188, 140, 255, 0.85);
}

.multi-thumb.thumb-p1:hover,
.multi-thumb.thumb-p1.active {
  box-shadow: 0 0 14px rgba(188, 140, 255, 1.0), 0 0 0 3px rgba(188, 140, 255, 0.4);
}

/* Mode 2 Thumb (P2, Amber / FM Modulator) */
.multi-thumb.thumb-p2 {
  background: #f0883e;
  box-shadow: 0 0 10px rgba(240, 136, 62, 0.85);
}

.multi-thumb.thumb-p2:hover,
.multi-thumb.thumb-p2.active {
  box-shadow: 0 0 14px rgba(240, 136, 62, 1.0), 0 0 0 3px rgba(240, 136, 62, 0.4);
}

.slider-indents-track {
  position: relative;
  width: calc(100% - 18px);
  margin-left: 9px;
  margin-right: 9px;
  height: 18px;
  margin-top: 2px;
}

.slider-indent-marker {
  position: absolute;
  top: 0;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  user-select: none;
  transition: transform 0.1s ease;
}

.slider-indent-tick {
  width: 2px;
  height: 5px;
  background-color: #8b949e;
  border-radius: 1px;
  transition: all 0.15s ease;
}

/* Primary Published Mode Notches (P1, P2, Pn) - Slightly Larger */
.slider-indent-marker.mode-primary .slider-indent-tick {
  width: 3px;
  height: 7px;
  border-radius: 1px;
}

.slider-indent-marker.primary.mode-primary .slider-indent-tick {
  background-color: var(--accent-cyan);
  box-shadow: 0 0 6px rgba(88, 166, 255, 0.9);
}

.slider-indent-marker.secondary.mode-primary .slider-indent-tick {
  background-color: #f0883e;
  box-shadow: 0 0 6px rgba(240, 136, 62, 0.9);
}

.slider-indent-marker.mode-primary .slider-indent-label {
  font-size: 10px;
  font-weight: 700;
  color: #c9d1d9;
  margin-top: 1px;
}

.slider-indent-marker.primary.mode-primary .slider-indent-label {
  color: #79c0ff;
}

.slider-indent-marker.secondary.mode-primary .slider-indent-label {
  color: #ffa657;
}

/* Harmonic Notches (0.5P, 2P) - Smaller */
.slider-indent-marker.harmonic .slider-indent-tick {
  height: 6px;
  width: 2px;
}

.slider-indent-marker.primary.harmonic .slider-indent-tick {
  background-color: rgba(121, 192, 255, 0.6);
  box-shadow: 0 0 3px rgba(121, 192, 255, 0.4);
}

.slider-indent-marker.secondary.harmonic .slider-indent-tick {
  background-color: rgba(240, 136, 62, 0.6);
  box-shadow: 0 0 3px rgba(240, 136, 62, 0.4);
}

.slider-indent-marker.harmonic .slider-indent-label {
  font-size: 9.5px;
  font-weight: 500;
  color: var(--text-muted);
  opacity: 0.8;
  margin-top: 2px;
}

.slider-indent-label {
  font-family: 'JetBrains Mono', monospace;
  white-space: nowrap;
}

.slider-indent-marker:hover .slider-indent-label {
  color: var(--text-main);
  opacity: 1;
}

/* Snapped state when thumb lands in magnetic zone */
.slider-indent-marker.snapped .slider-indent-tick {
  background-color: #ffffff;
  height: 13px;
  width: 4px;
  box-shadow: 0 0 10px #58a6ff, 0 0 4px #ffffff;
  transform: scale(1.15);
}

.slider-indent-marker.secondary.snapped .slider-indent-tick {
  box-shadow: 0 0 10px #f0883e, 0 0 4px #ffffff;
}

.slider-indent-marker.snapped .slider-indent-label {
  color: #ffffff;
  font-weight: 800;
  text-shadow: 0 0 8px rgba(88, 166, 255, 0.9);
}

.slider-indent-marker.secondary.snapped .slider-indent-label {
  text-shadow: 0 0 8px rgba(240, 136, 62, 0.9);
}

.period-slider-hint {
  font-size: 10.5px;
  color: var(--text-muted);
  opacity: 0.85;
  margin-top: 4px;
  text-align: center;
  user-select: none;
  letter-spacing: 0.1px;
}

/* Canvas Container */
.canvas-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1 1 180px;
  min-height: 180px;
}

.canvas-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.legend-group {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  color: var(--text-muted);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.legend-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.obs-dot { background-color: var(--plot-obs); }
.wave-dot { background-color: var(--plot-line); }
.ghost-dot { background-color: rgba(139, 148, 158, 0.45); }

.canvas-controls-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.smoothness-control-wrap {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(48, 54, 61, 0.35);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2px 8px;
  font-size: 10.5px;
}

.smoothness-control-wrap label {
  color: var(--text-muted);
  font-weight: 500;
}

#smoothness-slider {
  width: 55px;
  height: 4px;
  accent-color: var(--accent-magenta);
  cursor: pointer;
}

.smoothness-val {
  font-size: 10.5px;
  color: var(--accent-magenta);
  font-weight: 600;
  min-width: 26px;
  text-align: right;
  font-family: 'JetBrains Mono', monospace;
}

.toggle-pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background-color: rgba(48, 54, 61, 0.5);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2px 10px;
  height: 23px;
  font-size: 10.5px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  flex-shrink: 0;
}

.toggle-pill-btn:hover {
  background-color: var(--border-color);
  color: var(--text-main);
}

.toggle-pill-btn .pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #8b949e;
  transition: all 0.2s ease;
}

.toggle-pill-btn.active {
  background-color: rgba(188, 140, 255, 0.18);
  border-color: var(--accent-magenta);
  color: var(--accent-magenta);
}

.toggle-pill-btn.active .pill-dot {
  background-color: var(--accent-magenta);
  box-shadow: 0 0 6px rgba(188, 140, 255, 0.8);
}

.canvas-wrapper {
  position: relative;
  flex: 1;
  width: 100%;
  min-height: 140px;
  background-color: #0b0e14;
  border-radius: 6px;
  border: 1px solid rgba(48, 54, 61, 0.4);
  overflow: hidden;
  box-sizing: border-box;
}

#phase-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(11, 14, 20, 0.85);
  color: var(--text-muted);
  font-size: 14px;
  pointer-events: none;
}

/* Audio Panel */
.audio-panel {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 14px;
  flex-shrink: 0;
}

.audio-panel-grid {
  display: grid;
  grid-template-columns: 195px 240px 1fr;
  gap: 16px;
  align-items: stretch;
}

.playback-controls {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 5px;
  min-width: 0;
}

.play-row {
  display: flex;
  align-items: stretch;
  gap: 6px;
  width: 100%;
}

.play-btn {
  flex: 1;
  background-color: var(--accent-green);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0 12px;
  height: 34px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s ease;
  box-shadow: 0 2px 6px rgba(35, 134, 54, 0.4);
  box-sizing: border-box;
}

.play-btn:hover:not(:disabled) {
  background-color: var(--accent-green-hover);
  transform: translateY(-1px);
}

.play-btn.playing {
  background-color: #da3633;
  box-shadow: 0 2px 6px rgba(218, 54, 51, 0.4);
}

.play-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.download-icon-btn {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  background-color: var(--border-color);
  color: var(--text-main);
  border: 1px solid rgba(240, 246, 252, 0.1);
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-sizing: border-box;
  padding: 0;
  transition: all 0.15s ease;
}

.download-icon-btn:hover:not(:disabled) {
  background-color: #388bfd;
  color: #fff;
  border-color: #58a6ff;
  transform: translateY(-1px);
}

.download-icon-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.playback-subcontrols {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.volume-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 2px;
  font-size: 10.5px;
  color: var(--text-muted);
  height: 18px;
}

.volume-row label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.volume-row input[type="range"] {
  flex: 1;
  height: 14px;
  accent-color: var(--accent-magenta);
  cursor: pointer;
}

.volume-row .mono {
  width: 28px;
  text-align: right;
  font-size: 10.5px;
}

.gain-scaling-row {
  display: flex;
  width: 100%;
}

.gain-scaling-row .toggle-pill-btn {
  width: 100%;
  justify-content: center;
  font-size: 10.5px;
  height: 22px;
  padding: 0 6px;
}

.pitch-controls {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
  padding: 1px 0;
  box-sizing: border-box;
}

.pitch-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  line-height: 1.2;
}

.pitch-header label {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.pitch-display {
  color: var(--accent-cyan);
  font-weight: 700;
  font-size: 11.5px;
}

.pitch-slider-wrap {
  display: flex;
  align-items: center;
  height: 20px;
  margin: 3px 0 6px 0;
  width: 100%;
}

#pitch-slider {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
  height: 18px;
  margin: 0;
}

.pitch-presets {
  display: flex;
  gap: 8px;
  width: 100%;
}

.pitch-presets .preset-btn {
  flex: 1;
  text-align: center;
  justify-content: center;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.pitch-presets #prop-pitch-btn {
  flex: 1.4;
}

.preset-btn {
  background-color: rgba(48, 54, 61, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 10.5px;
  padding: 2px 8px;
  height: 22px;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  transition: all 0.15s ease;
  box-sizing: border-box;
}

.preset-btn:hover {
  background-color: var(--border-color);
  color: var(--text-main);
  border-color: #58a6ff;
}

.preset-btn.active {
  background-color: rgba(88, 166, 255, 0.2);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  font-weight: 700;
  box-shadow: 0 0 8px rgba(88, 166, 255, 0.35);
}

.physics-gauge {
  background-color: rgba(11, 14, 20, 0.65);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 14px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
  box-sizing: border-box;
}

.gauge-header {
  font-size: 9.5px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 3px;
  border-bottom: 1px solid rgba(48, 54, 61, 0.5);
  padding-bottom: 2px;
  font-weight: 600;
}

.gauge-content {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 10.5px;
}

.gauge-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.g-label {
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  white-space: nowrap;
  flex-shrink: 0;
}

.g-val {
  color: var(--text-main);
  font-size: 10.5px;
  white-space: nowrap;
  text-align: right;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.gauge-highlight {
  margin-top: 3px;
  padding-top: 3px;
  border-top: 1px dashed rgba(48, 54, 61, 0.8);
}

.g-speedup-label {
  color: var(--accent-orange);
  font-weight: 500;
  font-family: 'JetBrains Mono', monospace;
  white-space: nowrap;
  flex-shrink: 0;
}

.g-speedup-val {
  color: var(--accent-orange);
  font-weight: 700;
  white-space: nowrap;
  text-align: right;
}

/* ==========================================================================
   Responsive Design Breakpoints for Time-Range Explorer & Audio Panel
   ========================================================================== */

@media (max-width: 900px) {
  .epoch-explorer-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .epoch-controls-group {
    width: 100%;
    justify-content: space-between;
  }

  .audio-panel-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .physics-gauge {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  .epoch-controls-group {
    flex-wrap: wrap;
  }

  .epoch-survey-buttons {
    flex-wrap: wrap;
  }

  .epoch-survey-btn {
    padding: 0 6px;
    font-size: 10px;
    height: 24px;
  }

  .epoch-readout-badge {
    font-size: 10px;
    padding: 2px 6px;
  }

  .audio-panel-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .physics-gauge {
    grid-column: auto;
  }
}