:root {
  /* Background */
  --color-bg-primary: #0b0c13;
  --color-bg-secondary: #0d0e17;
  --color-bg-tertiary: #0a0b12;
  --color-bg-elevated: #13141f;
  --color-bg-popover: #12131d;
  --color-bg-loading: rgba(13, 14, 23, 0.9);

  /* Border */
  --color-border-default: #151825;
  --color-border-subtle: #1c2035;
  --color-border-strong: #273042;

  /* Text */
  --color-text-primary: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-tertiary: #64748b;
  --color-text-muted: #475569;
  --color-text-disabled: #3b4252;
  --color-text-subtle: #8b95a5;
  --color-text-icon: #4b5563;

  /* Accent */
  --color-accent-blue: #3b82f6;
  --color-accent-blue-light: #60a5fa;
  --color-accent-blue-pale: #bfdbfe;
  --color-accent-cyan: #06b6d4;
  /* Semantic default accent alias */
  --color-accent: var(--color-accent-blue);
  --color-accent-light: var(--color-accent-blue-light);
  --color-accent-hover: #93c5fd;
  --color-accent-contrast: #ffffff;
  --color-accent-surface-soft: rgba(59, 130, 246, 0.08);
  --color-accent-surface-subtle: rgba(59, 130, 246, 0.1);
  --color-accent-surface: rgba(59, 130, 246, 0.12);
  --color-accent-surface-selected: rgba(59, 130, 246, 0.15);
  --color-accent-surface-hover: rgba(59, 130, 246, 0.2);
  --color-accent-surface-strong: rgba(59, 130, 246, 0.24);
  --color-accent-border: rgba(59, 130, 246, 0.28);
  --color-accent-purple: #8b5cf6;
  --color-accent-purple-light: #a78bfa;
  --color-accent-purple-surface: rgba(139, 92, 246, 0.1);
  --color-accent-purple-surface-hover: rgba(139, 92, 246, 0.2);
  --color-accent-purple-border: rgba(139, 92, 246, 0.25);

  /* Status surfaces */
  --color-status-success-surface: rgba(34, 197, 94, 0.12);
  --color-status-success-border: rgba(34, 197, 94, 0.3);
  --color-status-warning-surface: rgba(245, 158, 11, 0.12);
  --color-status-warning-surface-soft: rgba(245, 158, 11, 0.08);
  --color-status-warning-surface-selected: rgba(245, 158, 11, 0.15);
  --color-status-warning-border: rgba(245, 158, 11, 0.3);
  --color-status-warning-border-soft: rgba(245, 158, 11, 0.18);
  --color-status-error-surface: rgba(239, 68, 68, 0.12);
  --color-status-error-surface-soft: rgba(239, 68, 68, 0.15);
  --color-status-error-border: rgba(239, 68, 68, 0.3);

  /* Interaction */
  --color-surface-hover: rgba(255, 255, 255, 0.05);
  --color-surface-hover-subtle: rgba(255, 255, 255, 0.04);
  --color-surface-subtle: rgba(255, 255, 255, 0.02);
  --color-surface-muted: rgba(255, 255, 255, 0.03);
  --color-surface-control: rgba(255, 255, 255, 0.06);
  --viewer-surface-subtle: rgba(255, 255, 255, 0.03);
  --viewer-surface-elevated: rgba(255, 255, 255, 0.05);
  --color-overlay-scrim: rgba(0, 0, 0, 0.5);
  --color-overlay-scrim-strong: rgba(0, 0, 0, 0.6);
  --color-overlay-surface-dim: rgba(0, 0, 0, 0.18);
  --color-overlay-surface: rgba(0, 0, 0, 0.5);
  --color-overlay-surface-strong: rgba(0, 0, 0, 0.55);
  --color-overlay-surface-hud: rgba(0, 0, 0, 0.6);
  --color-overlay-surface-hud-soft: rgba(0, 0, 0, 0.5);
  --color-overlay-panel-soft: rgba(13, 14, 23, 0.92);
  --color-overlay-panel-strong: rgba(13, 14, 23, 0.95);
  --color-overlay-label: rgba(13, 14, 23, 0.85);
  --color-overlay-banner: rgba(20, 20, 24, 0.92);
  --shadow-control: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-text: 0 1px 3px rgba(0, 0, 0, 1);
  --shadow-text-soft: 0 1px 2px rgba(0, 0, 0, 0.8);
  --shadow-label-box: 0 2px 6px rgba(0, 0, 0, 0.35);
  --shadow-banner: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-popover: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-panel: 0 12px 32px rgba(0, 0, 0, 0.65);
  --shadow-dialog-strong: 0 12px 48px rgba(0, 0, 0, 0.7);
  --shadow-floating-panel: 0 14px 30px rgba(0, 0, 0, 0.35);
  --shadow-floating-dock: 0 10px 24px rgba(0, 0, 0, 0.28);

  /* Status */
  --color-status-success: #22c55e;
  --color-status-success-light: #86efac;
  --color-status-error: #ef4444;
  --color-status-error-light: #fecaca;
  --color-status-warning: #f59e0b;
  --color-status-warning-light: #fbbf24;
  --color-status-warning-pale: #fcd34d;
  --color-status-info: #a78bfa;
  --color-status-info-light: #c4b5fd;
  --color-status-info-pale: #dcc7ff;
  --color-status-info-surface: rgba(167, 139, 250, 0.12);
  --color-status-info-surface-hover: rgba(167, 139, 250, 0.2);
  --color-status-info-border: rgba(167, 139, 250, 0.28);
  --color-accent-cyan-light: #22d3ee;
  --color-accent-cyan-surface: rgba(6, 182, 212, 0.1);
  --color-accent-cyan-surface-hover: rgba(6, 182, 212, 0.2);
  --color-accent-cyan-border: rgba(6, 182, 212, 0.28);

  /* Activity chrome */
  --color-activity-files: var(--color-accent-blue);
  --color-activity-files-light: var(--color-accent-blue-light);
  --color-activity-files-surface: var(--color-accent-surface-subtle);
  --color-activity-files-surface-hover: var(--color-accent-surface-hover);
  --color-activity-tools: var(--color-status-warning);
  --color-activity-tools-light: var(--color-status-warning-light);
  --color-activity-tools-surface: rgba(245, 158, 11, 0.1);
  --color-activity-tools-surface-hover: rgba(245, 158, 11, 0.2);
  --color-activity-workflow: var(--color-accent-blue);
  --color-activity-workflow-light: var(--color-accent-blue-light);
  --color-activity-workflow-surface: var(--color-accent-surface-subtle);
  --color-activity-workflow-surface-hover: var(--color-accent-surface-hover);
  --color-activity-hub: var(--color-accent-purple);
  --color-activity-hub-light: var(--color-accent-purple-light);
  --color-activity-hub-surface: var(--color-accent-purple-surface);
  --color-activity-hub-surface-hover: var(--color-accent-purple-surface-hover);
  --color-activity-ext: var(--color-accent-cyan);
  --color-activity-ext-light: var(--color-accent-cyan-light);
  --color-activity-ext-surface: var(--color-accent-cyan-surface);
  --color-activity-ext-surface-hover: var(--color-accent-cyan-surface-hover);

  /* Top bar chrome */
  --color-topbar-action-primary: #22c55e;
  --color-topbar-action-primary-light: #4ade80;
  --color-topbar-action-primary-hover: #86efac;
  --color-topbar-action-primary-surface: rgba(34, 197, 94, 0.16);
  --color-topbar-action-primary-surface-hover: rgba(34, 197, 94, 0.26);
  --color-topbar-action-primary-border: rgba(34, 197, 94, 0.32);
  --color-topbar-action-secondary: #8b95a5;
  --color-topbar-action-secondary-hover: #e2e8f0;
  --color-topbar-action-secondary-surface-hover: rgba(255, 255, 255, 0.05);

  /* Side panel chrome */
  --color-sidepanel-segmented-active: var(--color-text-primary);
  --color-sidepanel-segmented-active-surface: rgba(255, 255, 255, 0.06);
  --color-sidepanel-segmented-inactive: var(--color-text-tertiary);

  /* Viewport overlays */
  --color-viewport-orientation-marker: #4ade80;
  --color-analysis-compare: #a855f7;
  --color-analysis-compare-a: #60a5fa;
  --color-analysis-compare-b: #f472b6;
  --color-analysis-mesh: #22c55e;
  --color-analysis-plane-primary: #fbbf24;
  --color-analysis-plane-x-axis: #f87171;
  --color-analysis-plane-y-axis: #4ade80;
  --color-analysis-plane-z-axis: #60a5fa;
  --color-analysis-plane-roll: #a78bfa;
  --color-analysis-sync: #22d3ee;
  --color-analysis-voi: #22d3ee;
  --color-analysis-crop: #fb923c;
  --color-analysis-crop-alt: #f97316;

  /* Typography — scale */
  --font-scale: 1;
  --font-small-scale: 1;
  --font-line-height-normal: 1.45;
  --font-family-mono: 'IBM Plex Mono', 'JetBrains Mono', 'SF Mono', monospace;
  --font-size-xs: calc(10px * var(--font-scale) * var(--font-small-scale));
  --font-size-sm: calc(12px * var(--font-scale));
  --font-size-md: calc(14px * var(--font-scale));
  --font-size-lg: calc(16px * var(--font-scale));
  --font-size-xl: calc(18px * var(--font-scale));
  --font-size-xxl: calc(20px * var(--font-scale));
  /* Typography — semantic aliases (hybrid) */
  --font-size-caption: calc(11px * var(--font-scale) * var(--font-small-scale));
  --font-size-body: calc(13px * var(--font-scale));
  --font-size-title: calc(15px * var(--font-scale));
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-none: 1;
  --line-height-normal: var(--font-line-height-normal);
  --letter-spacing-tight: 0.04em;
  --letter-spacing-wide: 0.08em;
  --letter-spacing-wider: 0.1em;

  /* Spacing */
  --spacing-0: 0px;
  --spacing-1: 2px;
  --spacing-2: 4px;
  --spacing-3: 6px;
  --spacing-4: 8px;
  --spacing-5: 10px;
  --spacing-6: 12px;
  --spacing-7: 14px;
  --spacing-8: 16px;
  --spacing-10: 20px;
  --spacing-12: 24px;

  /* Borders */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 6px;
  --radius-xl: 8px;
  --radius-xxl: 12px;
  --radius-full: 16px;
  --border-thin: 1px;
  --border-medium: 1.5px;
  --border-thick: 2px;

  /* Shadows */
  --shadow-dropdown: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-modal: 0 8px 32px rgba(0, 0, 0, 0.6);
  --shadow-viewport: 0 0 0 1px rgba(59, 130, 246, 0.5);

  /* Scrollbar */
  --color-scrollbar-track: rgba(255, 255, 255, 0.04);
  --color-scrollbar-thumb: rgba(100, 116, 139, 0.78);
  --color-scrollbar-thumb-hover: rgba(148, 163, 184, 0.9);
  --color-scrollbar-thumb-active: rgba(226, 232, 240, 0.92);
  --color-scrollbar-corner: rgba(255, 255, 255, 0.02);

  /* Z-index */
  --z-dropdown: 100;
  --z-tooltip: 200;
  --z-modal: 1000;
}

html {
  scrollbar-color: var(--color-scrollbar-thumb) var(--color-scrollbar-track);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-scrollbar-thumb) var(--color-scrollbar-track);
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-track {
  background: var(--color-scrollbar-track);
}

*::-webkit-scrollbar-thumb {
  background: var(--color-scrollbar-thumb);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--color-scrollbar-thumb-hover);
  border: 2px solid transparent;
  background-clip: padding-box;
}

*::-webkit-scrollbar-thumb:active {
  background: var(--color-scrollbar-thumb-active);
  border: 2px solid transparent;
  background-clip: padding-box;
}

*::-webkit-scrollbar-corner {
  background: var(--color-scrollbar-corner);
}

/* PDF text layer — pdf.js TextLayer overlay. Rendered absolutely on top of
   the canvas; spans carry transparent color so glyphs remain visual-only on
   the canvas while selection / copy still operate on the DOM text. */
.pdf-text-layer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: auto;
  user-select: text;
  line-height: 1;
  opacity: 1;
  /* pdf.js expects a `--scale-factor` CSS var for font sizing inside spans. */
  --scale-factor: 1;
}

.pdf-text-layer span,
.pdf-text-layer br {
  color: transparent;
  position: absolute;
  white-space: pre;
  cursor: text;
  transform-origin: 0% 0%;
}

.pdf-text-layer ::selection {
  background: rgba(59, 130, 246, 0.4);
  color: transparent;
}

.pdf-text-layer .pdf-find-match {
  background: rgba(245, 158, 11, 0.35);
  border-radius: 2px;
}

.pdf-text-layer .pdf-find-match-current {
  background: rgba(245, 158, 11, 0.7);
}

/* PDF link overlay — transparent clickable rectangles positioned over each
   pdf.js link annotation. We host our own buttons (not pdf.js's annotation
   layer anchors) so the click handler can intercept navigation and route the
   URL through clipboard + audit instead of launching a browser. */
.pdf-link-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.pdf-link-layer button {
  position: absolute;
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  pointer-events: auto;
  outline-offset: 2px;
}

.pdf-link-layer button:focus-visible {
  outline: 2px solid rgba(59, 130, 246, 0.8);
}

.pdf-link-layer button:hover {
  background: rgba(59, 130, 246, 0.15);
}

/* Slice index slider — Radiant-style position indicator (no progress fill).
   Custom div-based slider (not native range) for pixel-precise control. */
.medio-slice-slider-wrap {
  position: absolute;
  right: 8px;
  top: 30px;
  bottom: 12px;
  width: 14px;
  z-index: 20;
  cursor: pointer;
  touch-action: none;
}

.medio-slice-slider-track {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-border-default);
  border-radius: 3px;
  pointer-events: none;
}

.medio-slice-slider-state-layer {
  position: absolute;
  inset: 0;
  border-radius: 3px;
  overflow: hidden;
}

.medio-slice-slider-state-segment {
  position: absolute;
  left: 0;
  right: 0;
  opacity: 0.95;
}

.medio-slice-slider-thumb {
  position: absolute;
  left: 0;
  right: 0;
  height: 12px;
  background: var(--color-accent-blue);
  border: 1px solid var(--color-bg-secondary);
  border-radius: 2px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
  pointer-events: none;
  transition:
    background 0.12s,
    transform 0.12s;
}

.medio-slice-slider-wrap:hover .medio-slice-slider-thumb {
  filter: brightness(1.15);
}

.medio-slice-slider-wrap:active .medio-slice-slider-thumb {
  transform: scale(1.05);
}