/* ==========================================================================
   Constellation – Base Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --color-bg: #0d0d0f;
  --color-surface: #18181b;
  --color-surface-elevated: #232326;
  --color-border: #2a2a2e;
  --color-text-primary: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-accent: #22c55e;
  /* Vibrant Green */
  --color-accent-dark: #15803d;
  /* Deep Green for contrast */
  --color-accent-dim: rgba(34, 197, 94, 0.15);
  --color-band-core: #22c55e;
  --color-band-near: #facc15;
  --color-band-far: #ef4444;
  --color-band-edge: #71717a;
  --color-stage-glow: rgba(34, 197, 94, 0.03);
  --color-stage-glow-fade: rgba(0, 0, 0, 0);
  --color-stage-ring: rgba(255, 255, 255, 0.08);
  --color-stage-ring-label: rgba(255, 255, 255, 0.15);
  --color-gap-glow: rgba(34, 197, 94, 0.4);
  --color-gap-glow-fade: rgba(34, 197, 94, 0);
  --color-gap-inner: #4ade80;
  --color-gap-outer: #22c55e;
  --color-gap-border: rgba(255, 255, 255, 0.3);
  --color-gap-text: #ffffff;
  --color-node-muted-fill: #3f3f46;
  --color-node-muted-stroke: #52525b;
  --color-node-muted-text: #a1a1aa;
  --color-node-text: #fafafa;
  --color-node-text-light: #fafafa;
  --color-node-text-dark: #111111;
  --color-node-selection: #22c55e;
  --color-node-selection-glow: rgba(34, 197, 94, 0.3);
  --color-node-selection-glow-fade: rgba(34, 197, 94, 0);
  --color-node-shadow: rgba(0, 0, 0, 0.4);
  --color-node-shadow-strong: rgba(0, 0, 0, 0.8);
  --color-node-band-label: rgba(255, 255, 255, 0.5);
  --stage-hue-start: 120;
  --stage-hue-end: 0;
  --node-fill-mode: hue;
  --stage-ring-width: 1;
  --node-stroke-width: 2;
  --gap-border-width: 2;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  /* Layout */
  --topbar-height: 56px;
  --panel-width: 280px;

  /* Transitions */
  --transition-fast: 120ms ease;
  --transition-base: 200ms ease;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* Light Theme Overrides */
[data-theme="light"] {
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-surface-elevated: #f4f4f5;
  --color-border: #e4e4e7;
  --color-text-primary: #18181b;
  --color-text-secondary: #52525b;
  --color-text-muted: #a1a1aa;
  --color-accent: #16a34a;
  --color-accent-dark: #15803d;
  --color-accent-dim: rgba(22, 163, 74, 0.1);
}

/* Disco Theme Overrides */
[data-theme="disco"] {
  --bauhaus-red: #d62828;
  --bauhaus-blue: #1f5fbf;
  --bauhaus-yellow: #f5c518;
  --bauhaus-black: #111111;
  --bauhaus-white: #fff7e1;
  --color-bg: #f7f2e4;
  --color-surface: #fffaf0;
  --color-surface-elevated: #fff1cf;
  --color-border: var(--bauhaus-black);
  --color-text-primary: var(--bauhaus-black);
  --color-text-secondary: #1f2937;
  --color-text-muted: #4b5563;
  --color-accent: var(--bauhaus-red);
  --color-accent-dark: var(--bauhaus-blue);
  --color-accent-dim: rgba(245, 197, 24, 0.35);
  --color-band-core: var(--bauhaus-red);
  --color-band-near: var(--bauhaus-yellow);
  --color-band-far: var(--bauhaus-blue);
  --color-band-edge: var(--bauhaus-black);
  --color-stage-glow: rgba(245, 197, 24, 0.2);
  --color-stage-glow-fade: rgba(247, 242, 228, 0);
  --color-stage-ring: rgba(17, 17, 17, 0.35);
  --color-stage-ring-label: rgba(17, 17, 17, 0.7);
  --color-gap-glow: rgba(214, 40, 40, 0.25);
  --color-gap-glow-fade: rgba(214, 40, 40, 0);
  --color-gap-inner: var(--bauhaus-yellow);
  --color-gap-outer: var(--bauhaus-red);
  --color-gap-border: var(--bauhaus-black);
  --color-gap-text: var(--bauhaus-black);
  --color-node-muted-fill: #e5e7eb;
  --color-node-muted-stroke: #111111;
  --color-node-muted-text: #374151;
  --color-node-text: var(--bauhaus-black);
  --color-node-text-light: #fffaf0;
  --color-node-text-dark: var(--bauhaus-black);
  --color-node-selection: var(--bauhaus-black);
  --color-node-selection-glow: rgba(31, 95, 191, 0.3);
  --color-node-selection-glow-fade: rgba(31, 95, 191, 0);
  --color-node-shadow: transparent;
  --color-node-shadow-strong: transparent;
  --color-node-band-label: rgba(17, 17, 17, 0.85);
  --stage-hue-start: 0;
  --stage-hue-end: 60;
  --node-fill-mode: band;
  --stage-ring-width: 2;
  --node-stroke-width: 2;
  --gap-border-width: 2;
  --font-sans: 'Futura', 'Avenir Next', 'Trebuchet MS', 'Century Gothic', sans-serif;
  --radius-sm: 0;
  --radius-md: 0;
  --radius-lg: 0;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.5;
  min-height: 100vh;
  overflow: hidden;
  user-select: none;
}

input,
textarea,
[contenteditable="true"] {
  user-select: text;
}

/* --------------------------------------------------------------------------
   Layout Shell
   -------------------------------------------------------------------------- */
#app {
  display: grid;
  grid-template-rows: var(--topbar-height) 1fr;
  grid-template-columns: var(--panel-width) 1fr var(--panel-width);
  grid-template-areas:
    "topbar topbar topbar"
    "left   stage  right";
  height: 100vh;
  width: 100vw;
}

/* --------------------------------------------------------------------------
   Top Bar
   -------------------------------------------------------------------------- */
#topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-md);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  gap: var(--space-md);
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.topbar-center {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.logo-mark {
  position: relative;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.logo-ring {
  position: absolute;
  border-radius: 50%;
  border: 1.5px solid;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.logo-ring-1 {
  width: 28px;
  height: 28px;
  border-color: var(--color-band-far, #ef4444);
  animation: logo-pulse 4s ease-in-out infinite;
}

.logo-ring-2 {
  width: 20px;
  height: 20px;
  border-color: var(--color-band-near, #facc15);
  animation: logo-pulse 4s ease-in-out 0.5s infinite;
}

.logo-ring-3 {
  width: 12px;
  height: 12px;
  border-color: var(--color-band-core, #22c55e);
  animation: logo-pulse 4s ease-in-out 1s infinite;
}

.logo-dot {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  top: 50%;
  left: 50%;
}

.logo-dot-1 {
  background: var(--color-band-core, #22c55e);
  transform: translate(-50%, -50%);
}

.logo-dot-2 {
  background: var(--color-band-near, #facc15);
  transform: translate(calc(-50% + 5px), calc(-50% - 3px));
}

.logo-dot-3 {
  background: var(--color-band-far, #ef4444);
  transform: translate(calc(-50% - 4px), calc(-50% + 6px));
}

@keyframes logo-pulse {

  0%,
  100% {
    opacity: 0.6;
  }

  50% {
    opacity: 1;
  }
}

.topbar-divider {
  width: 1px;
  height: 24px;
  background: var(--color-border);
}

/* Top Bar Buttons */
.topbar-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.topbar-btn:hover {
  background: var(--color-border);
  color: var(--color-text-primary);
}

.topbar-btn.primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.topbar-btn.primary:hover {
  background: #ea580c;
  border-color: #ea580c;
}

.btn-icon {
  font-size: 0.875rem;
}

.btn-label {
  white-space: nowrap;
}

/* Top Bar Selects */
.topbar-select-group {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.select-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.topbar-select {
  padding: var(--space-xs) var(--space-sm);
  padding-right: var(--space-lg);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2371717a' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}

.topbar-select:hover {
  border-color: var(--color-text-muted);
}

.topbar-select:focus {
  outline: none;
  border-color: var(--color-accent);
}

/* Top Bar Toggle (iOS-style) */
.topbar-toggle-group {
  display: flex;
  align-items: center;
}

.topbar-toggle-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  user-select: none;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.topbar-toggle-label:hover {
  color: var(--color-text-secondary);
}

.topbar-toggle-label input[type="checkbox"] {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.ios-track {
  width: 30px;
  height: 16px;
  border-radius: 999px;
  background: var(--color-border);
  position: relative;
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.ios-track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-text-muted);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.topbar-toggle-label input[type="checkbox"]:checked+.ios-track {
  background: var(--color-accent);
}

.topbar-toggle-label input[type="checkbox"]:checked+.ios-track::after {
  transform: translateX(14px);
  background: #fff;
}

.topbar-toggle-label input[type="checkbox"]:checked~span {
  color: var(--color-accent);
}

.topbar-toggle-label input[type="checkbox"]:focus-visible+.ios-track {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Left Panel (Snapshots)
   -------------------------------------------------------------------------- */
#panel-left {
  grid-area: left;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.panel-btn {
  padding: var(--space-xs) var(--space-sm);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.panel-btn:hover {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.panel-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
}

.panel-footer {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--color-border);
}

.panel-btn-sm {
  flex: 1;
  padding: var(--space-xs) var(--space-sm);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 0.625rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.panel-btn-sm:hover {
  background: var(--color-surface-elevated);
  border-color: var(--color-text-muted);
  color: var(--color-text-secondary);
}

/* Import Status */
.import-status {
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
}

.import-status:empty {
  display: none;
}

.import-status.success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid #22c55e;
  color: #22c55e;
}

.import-status.error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid #ef4444;
  color: #ef4444;
}

.modal-footer-left {
  display: flex;
  gap: var(--space-sm);
}

/* --------------------------------------------------------------------------
   Center Stage
   -------------------------------------------------------------------------- */
#stage {
  grid-area: stage;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  overflow: hidden;
}

/* Stage grain texture (ported from v8) */
#stage::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.22'/%3E%3C/svg%3E");
  opacity: 0.2;
  mix-blend-mode: soft-light;
  pointer-events: none;
  z-index: 1;
}

#stage-canvas {
  width: 100%;
  height: 100%;
  position: relative;
  z-index: 0;
}

/* --------------------------------------------------------------------------
   Right Panel (Nodes)
   -------------------------------------------------------------------------- */
#panel-right {
  grid-area: right;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border-left: 1px solid var(--color-border);
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   Placeholder Styles
   -------------------------------------------------------------------------- */
.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  text-align: center;
  padding: var(--space-lg);
}

.placeholder-card {
  background: var(--color-surface-elevated);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  text-align: center;
}

.placeholder-card small {
  display: block;
  margin-top: var(--space-xs);
  opacity: 0.6;
}

/* --------------------------------------------------------------------------
   Snapshot Cards
   -------------------------------------------------------------------------- */
.snapshot-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-sm);
  align-items: center;
}

/* Snapshot Mini-Map (ported from v8) */
.snapshot-minimap {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1.5px solid var(--color-border);
  position: relative;
  background: var(--color-bg);
  flex-shrink: 0;
  overflow: hidden;
}

.snapshot-minimap-dot {
  position: absolute;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.snapshot-info {
  min-width: 0;
  overflow: hidden;
}

.snapshot-card:hover {
  background: var(--color-border);
  border-color: var(--color-text-muted);
}

.snapshot-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xs);
}

.snapshot-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-primary);
}

.snapshot-delete {
  flex-shrink: 0;
  padding: 0 2px;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: 0.6875rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  white-space: nowrap;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.snapshot-card:hover .snapshot-delete {
  opacity: 1;
}

.snapshot-delete:hover {
  color: #ef4444;
}

.snapshot-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.snapshot-time {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
}

.snapshot-nodes {
  font-size: 0.625rem;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Node Cards
   -------------------------------------------------------------------------- */
.node-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--node-color, var(--band-color, var(--color-border)));
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

/* Node Color Dot — inline LED style */
.node-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--node-color, var(--band-color, var(--color-border)));
  flex-shrink: 0;
  display: inline-block;
  transition: background 120ms ease;
}

.node-card:hover {
  background: var(--color-border);
}

.node-card.selected {
  border-color: var(--node-color, var(--band-color, var(--color-accent)));
  border-left-color: var(--node-color, var(--band-color, var(--color-accent)));
  background: radial-gradient(circle at 0% 50%,
      color-mix(in srgb, var(--node-color, var(--band-color, var(--color-accent))) 10%, var(--color-surface-elevated) 90%),
      var(--color-surface-elevated) 60%);
}


.node-card.muted {
  opacity: 0.5;
}

.node-card.muted .node-name {
  text-decoration: line-through;
}

.node-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.node-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-primary);
}

.node-band {
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--node-color, var(--band-color, var(--color-text-muted)));
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  margin-left: auto;
}

.node-card-meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.node-role {
  font-style: italic;
}

/* Node Card Actions */
.node-card-actions {
  display: flex;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

.node-action-btn {
  flex: 1;
  padding: var(--space-xs);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.node-action-btn:hover {
  background: var(--color-surface-elevated);
  border-color: var(--color-text-muted);
}

.node-action-btn.active {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
}

.node-card.off-stage {
  opacity: 0.4;
  border-style: dashed;
}

/* --------------------------------------------------------------------------
   Add Node Button
   -------------------------------------------------------------------------- */
.add-node-btn {
  width: 100%;
  padding: var(--space-md);
  background: transparent;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-top: var(--space-sm);
}

.add-node-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* --------------------------------------------------------------------------
   Modals
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 1;
  visibility: visible;
  transition: all var(--transition-base);
}

.modal-overlay[aria-hidden="true"] {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 440px;
  max-height: 90vh;
  overflow: hidden;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
  transform: translateY(0);
  transition: transform var(--transition-base);
}

.modal-overlay[aria-hidden="true"] .modal {
  transform: translateY(20px);
}

.modal.modal-large {
  max-width: 680px;
}

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

.modal-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.modal-close {
  padding: var(--space-xs) var(--space-sm);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-surface-elevated);
  color: var(--color-text-primary);
}

.modal-body {
  padding: var(--space-lg);
  overflow-y: auto;
  max-height: 60vh;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
  gap: var(--space-sm);
}

.modal-footer-right {
  display: flex;
  gap: var(--space-sm);
}

/* Form Elements */
.form-group {
  margin-bottom: var(--space-md);
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.form-group input[type="text"],
.form-group textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  transition: border-color var(--transition-fast);
}

.form-group input[type="text"]:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-group input[type="text"]::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: flex;
  gap: var(--space-lg);
}

.form-row .form-group {
  flex: 1;
}

.form-group input[type="checkbox"] {
  margin-right: var(--space-xs);
}

/* Form Sections */
.form-section {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.form-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.form-section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

/* Checkbox Label */
.checkbox-label {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  font-size: 0.8125rem;
}

.checkbox-label input[type="checkbox"] {
  margin-right: var(--space-sm);
  accent-color: var(--color-accent);
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--color-border);
  border-radius: 20px;
  transition: all var(--transition-fast);
}

.toggle-slider::before {
  content: "";
  position: absolute;
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background: var(--color-text-muted);
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.toggle-switch input:checked+.toggle-slider {
  background: var(--color-accent);
}

.toggle-switch input:checked+.toggle-slider::before {
  transform: translateX(16px);
  background: #fff;
}

/* Form Select */
.form-select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  padding-right: var(--space-xl);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2371717a' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  transition: border-color var(--transition-fast);
}

.form-select:focus {
  outline: none;
  border-color: var(--color-accent);
}

/* Beam Controls */
.beam-controls {
  transition: opacity var(--transition-base);
}

.beam-controls.disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* Slider Group */
.slider-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.form-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--color-border);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.form-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.form-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.form-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

.slider-value {
  min-width: 40px;
  text-align: right;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
}

/* Modal Medium Size */
.modal.modal-medium {
  max-width: 520px;
}

/* Form hint text */
.form-hint {
  display: block;
  margin-top: var(--space-xs);
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #fff;
}

.btn-primary:hover {
  background: #16a34a;
  border-color: #16a34a;
}

.btn-secondary {
  background: transparent;
}

.btn-danger {
  background: transparent;
  border-color: #ef4444;
  color: #ef4444;
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* Prompt Output */
.prompt-output-container {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.prompt-output {
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  white-space: pre-wrap;
  word-wrap: break-word;
  max-height: 400px;
  overflow-y: auto;
  user-select: text;
  cursor: text;
}

/* Body Modal Open State */
body.modal-open {
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   Mobile Responsive
   -------------------------------------------------------------------------- */
#mobile-bottom-bar,
#mobile-panels-overlay {
  display: none;
}

@media (max-width: 960px) {
  #app {
    grid-template-rows: 1fr var(--topbar-height);
    grid-template-columns: 1fr;
    grid-template-areas:
      "stage"
      "bottom";
  }

  #topbar,
  #panel-left,
  #panel-right {
    display: none !important;
  }

  /* Bottom Bar */
  #mobile-bottom-bar {
    grid-area: bottom;
    display: flex;
    align-items: center;
    justify-content: space-around;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 0 var(--space-md);
    z-index: 100;
  }

  .mobile-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm);
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
  }

  .mobile-btn.primary {
    color: var(--color-accent);
    font-weight: 600;
  }

  /* Mobile Panels Overlay */
  #mobile-panels-overlay {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
    bottom: var(--topbar-height);
    background: var(--color-bg);
    z-index: 50;
    transition: transform var(--transition-base);
  }

  #mobile-panels-overlay.hidden {
    transform: translateY(100%);
  }

  .mobile-panels-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
  }

  .mobile-tabs {
    display: flex;
    gap: var(--space-md);
  }

  .mobile-tab {
    background: transparent;
    border: none;
    padding: var(--space-sm);
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
  }

  .mobile-tab.active {
    color: var(--color-text-primary);
    border-bottom-color: var(--color-accent);
  }

  .mobile-panels-content {
    flex: 1;
    overflow-y: auto;
    position: relative;
  }

  .mobile-panel-view {
    display: none;
    padding: var(--space-md);
  }

  .mobile-panel-view.active {
    display: block;
  }
}

/* --------------------------------------------------------------------------
   Context Menu (Right-click Help)
   -------------------------------------------------------------------------- */
.context-menu {
  position: fixed;
  z-index: 2000;
  min-width: 120px;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5), 0 0 1px rgba(34, 197, 94, 0.2);
  opacity: 0;
  visibility: hidden;
  transform: scale(0.95) translateY(-4px);
  transform-origin: top left;
  transition: all var(--transition-fast);
  overflow: hidden;
}

.context-menu.visible {
  opacity: 1;
  visibility: visible;
  transform: scale(1) translateY(0);
}

.context-menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.context-menu-item:hover {
  background: var(--color-accent-dim);
  color: var(--color-accent);
}

.context-menu-item .icon {
  font-size: 0.875rem;
  opacity: 0.7;
}

.context-menu-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-xs) 0;
}

/* Help Modal */
.modal.modal-help {
  max-width: 360px;
}

.help-content {
  text-align: center;
}

.help-target {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent-dim);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.help-target-icon {
  font-size: 1.25rem;
}

.help-target-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.help-description {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.help-description strong {
  color: var(--color-text-primary);
  font-weight: 500;
}

.help-tip {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: left;
}

.help-tip-icon {
  flex-shrink: 0;
  margin-top: 1px;
}

/* About Modal */
.modal.modal-about {
  max-width: 560px;
}

.about-modal-stack {
  display: grid;
  gap: var(--space-md);
}

.about-modal-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.about-modal-card h3 {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.about-modal-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.about-modal-steps {
  margin: 0 0 0 1.2rem;
  display: grid;
  gap: var(--space-sm);
}

.about-modal-steps li {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.55;
}

.about-modal-steps strong {
  color: var(--color-text-primary);
}

.about-modal-note {
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-left: 2px solid var(--color-accent);
  background: var(--color-accent-dim);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
}


/* --------------------------------------------------------------------------
   Disco Theme: Bauhaus Kindergarten (1930s)
   -------------------------------------------------------------------------- */
[data-theme="disco"] #topbar {
  background: var(--bauhaus-yellow);
  border-bottom: 3px solid var(--bauhaus-black);
}

[data-theme="disco"] .topbar-divider {
  width: 2px;
  background: var(--bauhaus-black);
}

[data-theme="disco"] .logo {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
}

[data-theme="disco"] #panel-left,
[data-theme="disco"] #panel-right {
  background: var(--bauhaus-white);
}

[data-theme="disco"] #panel-left {
  border-right: 3px solid var(--bauhaus-black);
}

[data-theme="disco"] #panel-right {
  border-left: 3px solid var(--bauhaus-black);
}

[data-theme="disco"] #mobile-bottom-bar {
  background: var(--bauhaus-yellow);
  border-top: 3px solid var(--bauhaus-black);
}

[data-theme="disco"] #mobile-panels-overlay {
  background: var(--bauhaus-white);
}

[data-theme="disco"] .mobile-panels-header {
  background: var(--bauhaus-blue);
  border-bottom: 3px solid var(--bauhaus-black);
  color: var(--bauhaus-white);
}

[data-theme="disco"] #panel-left .panel-header {
  background: var(--bauhaus-blue);
  color: var(--bauhaus-white);
  border-bottom: 3px solid var(--bauhaus-black);
}

[data-theme="disco"] #panel-right .panel-header {
  background: var(--bauhaus-red);
  color: var(--bauhaus-white);
  border-bottom: 3px solid var(--bauhaus-black);
}

[data-theme="disco"] .panel-header {
  font-weight: 700;
  letter-spacing: 0.12em;
}

[data-theme="disco"] .panel-footer {
  border-top: 3px solid var(--bauhaus-black);
  background: var(--bauhaus-white);
}

[data-theme="disco"] .topbar-btn,
[data-theme="disco"] .panel-btn,
[data-theme="disco"] .panel-btn-sm,
[data-theme="disco"] .node-action-btn,
[data-theme="disco"] .add-node-btn,
[data-theme="disco"] .btn,
[data-theme="disco"] .topbar-select,
[data-theme="disco"] .form-select,
[data-theme="disco"] .form-group input[type="text"],
[data-theme="disco"] .snapshot-card,
[data-theme="disco"] .node-card,
[data-theme="disco"] .placeholder-card,
[data-theme="disco"] .modal,
[data-theme="disco"] .modal-close,
[data-theme="disco"] .mobile-btn,
[data-theme="disco"] .mobile-tab {
  border-radius: 0;
  box-shadow: none;
  border-width: 2px;
  border-color: var(--bauhaus-black);
}

[data-theme="disco"] .mobile-tab {
  color: var(--bauhaus-black);
}

[data-theme="disco"] .mobile-tab.active {
  color: var(--bauhaus-black);
  border-bottom-color: var(--bauhaus-black);
}

[data-theme="disco"] .topbar-btn,
[data-theme="disco"] .panel-btn,
[data-theme="disco"] .panel-btn-sm,
[data-theme="disco"] .node-action-btn,
[data-theme="disco"] .btn,
[data-theme="disco"] .mobile-btn {
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

[data-theme="disco"] .topbar-btn,
[data-theme="disco"] .panel-btn,
[data-theme="disco"] .panel-btn-sm,
[data-theme="disco"] .node-action-btn,
[data-theme="disco"] .btn {
  background: var(--bauhaus-white);
  color: var(--bauhaus-black);
}

[data-theme="disco"] .topbar-btn:hover,
[data-theme="disco"] .panel-btn:hover,
[data-theme="disco"] .panel-btn-sm:hover,
[data-theme="disco"] .node-action-btn:hover,
[data-theme="disco"] .btn:hover {
  background: var(--bauhaus-yellow);
  color: var(--bauhaus-black);
}

[data-theme="disco"] .topbar-btn.primary {
  background: var(--bauhaus-red);
  border-color: var(--bauhaus-black);
  color: var(--bauhaus-white);
}

[data-theme="disco"] .topbar-btn.primary:hover {
  background: var(--bauhaus-blue);
  color: var(--bauhaus-white);
}

[data-theme="disco"] .btn-primary {
  background: var(--bauhaus-blue);
  border-color: var(--bauhaus-black);
  color: var(--bauhaus-white);
}

[data-theme="disco"] .btn-primary:hover {
  background: var(--bauhaus-red);
  color: var(--bauhaus-white);
}

[data-theme="disco"] .btn-secondary {
  background: var(--bauhaus-yellow);
  color: var(--bauhaus-black);
}

[data-theme="disco"] .btn-danger {
  background: var(--bauhaus-red);
  border-color: var(--bauhaus-black);
  color: var(--bauhaus-white);
}

[data-theme="disco"] .btn-danger:hover {
  background: var(--bauhaus-blue);
  color: var(--bauhaus-white);
}

[data-theme="disco"] .select-label {
  color: var(--bauhaus-black);
  letter-spacing: 0.1em;
}

[data-theme="disco"] .topbar-select,
[data-theme="disco"] .form-select {
  background-color: var(--bauhaus-white);
  color: var(--bauhaus-black);
  border-color: var(--bauhaus-black);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23111111' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E");
}

[data-theme="disco"] .topbar-select:focus,
[data-theme="disco"] .form-select:focus {
  border-color: var(--bauhaus-blue);
}

[data-theme="disco"] .snapshot-card {
  background: var(--bauhaus-white);
  border-left: 6px solid var(--bauhaus-blue);
}

[data-theme="disco"] .snapshot-card:hover {
  background: #fff2c2;
}

[data-theme="disco"] .snapshot-delete {
  color: var(--bauhaus-black);
}

[data-theme="disco"] .snapshot-delete:hover {
  color: var(--bauhaus-red);
}

[data-theme="disco"] .snapshot-nodes {
  background: var(--bauhaus-yellow);
  color: var(--bauhaus-black);
  border: 2px solid var(--bauhaus-black);
  border-radius: 0;
}

[data-theme="disco"] .node-card {
  background: var(--bauhaus-white);
  border-left-width: 6px;
}

[data-theme="disco"] .node-card.selected {
  background: #fff2c2;
  border-color: var(--bauhaus-black);
}

[data-theme="disco"] .node-band {
  background: var(--bauhaus-yellow);
  color: var(--bauhaus-black);
  border: 2px solid var(--bauhaus-black);
  border-radius: 0;
}

[data-theme="disco"] .node-card-actions {
  border-top: 2px solid var(--bauhaus-black);
}

[data-theme="disco"] .node-action-btn.active {
  background: var(--bauhaus-yellow);
  border-color: var(--bauhaus-black);
  color: var(--bauhaus-black);
}

[data-theme="disco"] .add-node-btn {
  background: var(--bauhaus-white);
  border-color: var(--bauhaus-black);
}

[data-theme="disco"] .add-node-btn:hover {
  background: var(--bauhaus-yellow);
  color: var(--bauhaus-black);
}

[data-theme="disco"] .modal-overlay {
  background: rgba(17, 17, 17, 0.4);
  backdrop-filter: none;
}

[data-theme="disco"] .modal {
  border: 3px solid var(--bauhaus-black);
  background: var(--bauhaus-white);
}

[data-theme="disco"] .modal-header {
  background: var(--bauhaus-yellow);
  border-bottom: 3px solid var(--bauhaus-black);
}

[data-theme="disco"] .modal-footer {
  border-top: 3px solid var(--bauhaus-black);
}

[data-theme="disco"] .modal-close {
  background: var(--bauhaus-white);
  color: var(--bauhaus-black);
}

[data-theme="disco"] .modal-close:hover {
  background: var(--bauhaus-blue);
  color: var(--bauhaus-white);
}

[data-theme="disco"] .form-section {
  border-bottom: 2px solid var(--bauhaus-black);
}

[data-theme="disco"] .form-group input[type="text"] {
  background: var(--bauhaus-white);
  color: var(--bauhaus-black);
  border-color: var(--bauhaus-black);
}

[data-theme="disco"] .form-group input[type="text"]:focus {
  border-color: var(--bauhaus-blue);
  box-shadow: none;
}

[data-theme="disco"] .toggle-slider {
  border-radius: 0;
  border: 2px solid var(--bauhaus-black);
  background: var(--bauhaus-white);
}

[data-theme="disco"] .toggle-slider::before {
  border-radius: 0;
  background: var(--bauhaus-black);
}

[data-theme="disco"] .toggle-switch input:checked+.toggle-slider {
  background: var(--bauhaus-blue);
}

[data-theme="disco"] .toggle-switch input:checked+.toggle-slider::before {
  background: var(--bauhaus-yellow);
}

[data-theme="disco"] .context-menu {
  border: 2px solid var(--bauhaus-black);
  box-shadow: none;
}

[data-theme="disco"] .help-tip {
  background: var(--bauhaus-yellow);
  color: var(--bauhaus-black);
  border-radius: 0;
  border: 2px solid var(--bauhaus-black);
}

/* ─────────────────────────────────────────────────────────────────
   Library Modal
   ───────────────────────────────────────────────────────────────── */

.library-toolbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-surface);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.library-search {
  width: 100%;
  padding: 10px 12px;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 1rem;
}

.library-search:focus {
  outline: none;
  border-color: var(--color-accent);
}

.library-filters {
  display: flex;
  gap: var(--space-xs);
  overflow-x: auto;
  padding-bottom: 4px;
}

.filter-chip {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.filter-chip.active,
.filter-chip:hover {
  background: var(--color-accent-dim);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.library-scroll-content {
  max-height: 60vh;
  overflow-y: auto;
  padding: var(--space-lg);
}

.library-section {
  margin-bottom: var(--space-xl);
}

.library-section-title {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

/* Card Style (for Trios & Recents) */
.library-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  cursor: pointer;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 100px;
}

.library-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.library-card-title {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.library-card-subtitle {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* List Style (for All Nodes) */
.library-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.library-node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.library-node-row:hover {
  background: var(--color-bg);
}

.library-node-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.library-node-name {
  font-weight: 600;
  color: var(--color-text-primary);
}

.library-node-role {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.library-add-btn {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.library-add-btn:hover {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}