/* ==========================================================================
   STAAD Helper - Precision CAD & Engineering Workstation Theme
   Clean, Disciplined, Sharp Edges, Zero AI-Slop, High-Density Telemetry
   ========================================================================== */

:root {
  /* Dark Zinc / Charcoal Palette (inspired by engineering CAD & Linear/VS Code) */
  --bg-app: #08080a;
  --bg-canvas: #0c0c0e;
  --bg-panel: #111114;
  --bg-surface: #17171c;
  --bg-surface-hover: #212127;
  --bg-surface-active: #2b2b33;

  /* Crisp 1px Hairline Borders */
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.20);
  --border-focus: #3b82f6;

  /* Typography Colors */
  --text-primary: #f4f4f5;   /* zinc-100 */
  --text-secondary: #a1a1aa; /* zinc-400 */
  --text-muted: #71717a;     /* zinc-500 */
  --text-dim: #52525b;       /* zinc-600 */

  /* Structural Engineering Status Colors (Non-fluorescent, Solid) */
  --color-pass: #10b981;
  --color-pass-subtle: rgba(16, 185, 129, 0.12);
  --color-pass-border: rgba(16, 185, 129, 0.3);

  --color-warn: #f59e0b;
  --color-warn-subtle: rgba(245, 158, 11, 0.12);
  --color-warn-border: rgba(245, 158, 11, 0.3);

  --color-fail: #ef4444;
  --color-fail-subtle: rgba(239, 68, 68, 0.12);
  --color-fail-border: rgba(239, 68, 68, 0.35);

  --color-accent: #3b82f6;   /* Engineering sapphire */
  --color-accent-subtle: rgba(59, 130, 246, 0.12);
  --color-accent-border: rgba(59, 130, 246, 0.35);

  /* Geometry - Sharp Edges (Zero AI-Slop Pills) */
  --radius-none: 0px;
  --radius-xs: 2px;
  --radius-sm: 2px;
  --radius-md: 3px;

  /* Typography Stacks */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   App Header (Compact 46px Engineering Title Bar)
   ========================================================================== */
.app-header {
  height: 46px;
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  z-index: 50;
  flex-shrink: 0;
  user-select: none;
}

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

.brand-logo {
  width: 26px;
  height: 26px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

.brand-logo svg {
  width: 15px;
  height: 15px;
}

.brand-title {
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.brand-badge {
  font-size: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 1.5px 6px;
  border-radius: var(--radius-xs);
  background: var(--bg-surface);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

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

/* Model Status Tag */
.model-status-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  height: 28px;
}

.model-status-indicator.empty {
  color: var(--text-muted);
  border-style: solid;
  border-color: var(--border-subtle);
}

.model-status-indicator.loaded {
  border-color: var(--color-pass-border);
  background: var(--color-pass-subtle);
  color: var(--text-primary);
}

.status-indicator-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-xs);
  background: var(--text-dim);
  flex-shrink: 0;
}

.model-status-indicator.loaded .status-indicator-dot {
  background: var(--color-pass);
}

.model-name-text {
  max-width: 220px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.btn-unload {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0 2px 0 4px;
  font-size: 12px;
  line-height: 1;
  border-radius: var(--radius-xs);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-unload:hover {
  color: var(--color-fail);
}

/* Sharp Engineering Buttons */
.btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0 10px;
  height: 28px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-medium);
}

.btn:active {
  background: var(--bg-surface-active);
}

.btn svg {
  color: var(--text-muted);
  flex-shrink: 0;
}

.btn:hover svg {
  color: var(--text-secondary);
}

/* Primary Button (Sharp, Clean Steel Blue) */
.btn-primary {
  background: #2563eb;
  border: 1px solid #3b82f6;
  color: #ffffff;
  font-weight: 600;
}

.btn-primary:hover {
  background: #1d4ed8;
  border-color: #60a5fa;
}

.btn-primary svg {
  color: #ffffff;
}

.btn-primary:hover svg {
  color: #ffffff;
}

/* ==========================================================================
   Main Workspace Layout
   ========================================================================== */
.main-container {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

/* 3D Viewport Area */
.viewport-wrapper {
  flex: 1;
  position: relative;
  background-color: var(--bg-canvas);
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  overflow: hidden;
}

.viewport-wrapper.drag-active {
  box-shadow: inset 0 0 0 2px var(--color-accent);
}

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

/* ==========================================================================
   Empty State Card (Sharp, Clean CAD Importer)
   ========================================================================== */
.empty-state-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 25;
  pointer-events: none;
  background: rgba(8, 8, 10, 0.65);
}

.empty-state-card {
  pointer-events: auto;
  background: var(--bg-panel);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 32px 36px;
  max-width: 480px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.7);
}

.empty-state-card.dragover {
  border-color: var(--color-accent);
  background: var(--bg-surface);
}

.empty-state-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.empty-state-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.empty-state-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 20px;
}

.supported-formats-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 20px;
  text-align: left;
}

.supported-label {
  display: block;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.format-badges {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.badge-format {
  font-size: 11.5px;
  padding: 5px 8px;
  border-radius: var(--radius-xs);
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-format b {
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.btn-hero {
  padding: 0 16px;
  height: 34px;
  font-size: 12.5px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.drop-hint {
  display: block;
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 12px;
}

.drop-hint b {
  color: var(--text-secondary);
}

/* ==========================================================================
   Unified Top-Left Viewport HUD (Telemetry + Filters in One Clean Strip)
   ========================================================================== */
.viewport-hud {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  align-items: center;
  background: rgba(17, 17, 20, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 3px;
  z-index: 20;
  user-select: none;
  box-shadow: 0 8px 20px -5px rgba(0, 0, 0, 0.6);
}

/* Telemetry Counters */
.hud-metrics {
  display: flex;
  align-items: center;
  gap: 1px;
}

.metric-cell {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-xs);
}

.metric-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.metric-val {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.metric-cell.pass .metric-val { color: var(--color-pass); }
.metric-cell.warn .metric-val { color: var(--color-warn); }
.metric-cell.fail .metric-val { color: var(--color-fail); }
.metric-cell.dcr .metric-val { color: #60a5fa; }

.hud-divider {
  width: 1px;
  height: 18px;
  background: var(--border-subtle);
  margin: 0 4px;
}

/* Filter Buttons Segmented Bar */
.filter-tabs {
  display: flex;
  align-items: center;
  gap: 2px;
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 4px 8px;
  height: 26px;
  border-radius: var(--radius-xs);
  font-size: 11.5px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.tab-btn svg {
  color: var(--text-dim);
  flex-shrink: 0;
}

.tab-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--bg-surface);
  border-color: var(--border-medium);
  color: var(--text-primary);
  font-weight: 600;
}

.tab-btn.active svg {
  color: var(--text-primary);
}

.tab-btn.tab-fail.active {
  background: var(--color-fail-subtle);
  border-color: var(--color-fail-border);
  color: var(--color-fail);
}

.tab-btn.tab-fail.active svg {
  color: var(--color-fail);
}

.tab-count-badge {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  padding: 0 4px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
}

.tab-btn.active .tab-count-badge {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
}

.tab-btn.tab-fail.active .tab-count-badge {
  background: rgba(239, 68, 68, 0.2);
  color: var(--color-fail);
}

/* ==========================================================================
   CAD Viewport Camera Presets (Sharp Vertical CAD Strip)
   ========================================================================== */
.view-presets {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  flex-direction: column;
  background: rgba(17, 17, 20, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
  z-index: 20;
  box-shadow: 0 8px 20px -5px rgba(0, 0, 0, 0.6);
}

.preset-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

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

.preset-btn svg {
  width: 14px;
  height: 14px;
}

/* ==========================================================================
   Floating 3D Viewport Controls Toolbar (Bottom-Center)
   ========================================================================== */
.floating-toolbar {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(17, 17, 20, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 3px;
  display: flex;
  align-items: center;
  gap: 3px;
  z-index: 20;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.7);
  user-select: none;
}

.tool-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 0 8px;
  height: 26px;
  border-radius: var(--radius-xs);
  font-size: 11.5px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.tool-btn svg {
  color: var(--text-muted);
  flex-shrink: 0;
  width: 13px;
  height: 13px;
}

.tool-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.tool-btn.active {
  background: var(--bg-surface);
  border-color: var(--border-medium);
  color: var(--text-primary);
  font-weight: 600;
}

.tool-btn.active svg {
  color: var(--text-primary);
}

.toolbar-divider {
  width: 1px;
  height: 16px;
  background: var(--border-subtle);
  margin: 0 2px;
}

/* Stress Legend */
.stress-legend {
  position: absolute;
  bottom: 14px;
  left: 14px;
  background: rgba(17, 17, 20, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  z-index: 20;
}

.legend-title {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.legend-gradient {
  height: 6px;
  width: 150px;
  border-radius: var(--radius-none);
  background: linear-gradient(to right, #10b981 0%, #3b82f6 50%, #f59e0b 80%, #ef4444 100%);
}

.legend-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 9.5px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  margin-top: 3px;
}

/* Hover Tooltip */
.viewport-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(17, 17, 20, 0.96);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xs);
  padding: 6px 10px;
  font-size: 11.5px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.6);
  z-index: 40;
  display: none;
  min-width: 160px;
}

/* ==========================================================================
   Right Inspector & Engineering Properties Sidebar
   ========================================================================== */
.inspector-sidebar {
  width: 380px;
  background: var(--bg-panel);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  z-index: 30;
  flex-shrink: 0;
  overflow-y: auto;
}

.sidebar-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-panel);
}

.sidebar-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.sidebar-content {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* Member Summary Card */
.member-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px;
  position: relative;
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.member-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.member-meta {
  font-size: 11.5px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 2px;
}

/* Sharp Status Tag (No Pill Shapes) */
.status-badge {
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  font-size: 10px;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.status-badge.pass {
  background: var(--color-pass-subtle);
  color: var(--color-pass);
  border: 1px solid var(--color-pass-border);
}

.status-badge.warn {
  background: var(--color-warn-subtle);
  color: var(--color-warn);
  border: 1px solid var(--color-warn-border);
}

.status-badge.fail {
  background: var(--color-fail-subtle);
  color: var(--color-fail);
  border: 1px solid var(--color-fail-border);
}

/* DCR Meter Section */
.dcr-meter-section {
  margin: 10px 0;
}

.meter-header {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  margin-bottom: 5px;
}

.meter-label {
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.05em;
}

.meter-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.meter-track {
  width: 100%;
  height: 5px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-none);
  overflow: hidden;
  position: relative;
}

.meter-fill {
  height: 100%;
  border-radius: var(--radius-none);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.meter-threshold-line {
  position: absolute;
  left: 66.67%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: rgba(255, 255, 255, 0.35);
  z-index: 2;
}

/* 2x2 Precision Metric Tiles */
.prop-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border-subtle);
}

.prop-box {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  padding: 8px 10px;
  border-radius: var(--radius-xs);
}

.prop-name {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 4px;
}

.prop-name svg {
  color: var(--text-dim);
  width: 11px;
  height: 11px;
}

.prop-val {
  font-size: 12.5px;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-primary);
  margin-top: 3px;
  font-variant-numeric: tabular-nums;
}

/* Failure Reason Box */
.failure-box {
  background: var(--color-fail-subtle);
  border: 1px solid var(--color-fail-border);
  border-radius: var(--radius-sm);
  padding: 12px;
}

/* Compliance / Safety Box for Passing Members */
.compliance-box {
  background: var(--color-pass-subtle);
  border: 1px solid var(--color-pass-border);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.box-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-fail);
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: -0.01em;
}

.box-desc {
  font-size: 11.5px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 6px;
}

/* Engineering Solutions & What-If Redesign Card */
.solutions-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.solutions-header {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}

.solutions-header svg {
  color: var(--color-accent);
}

.solution-body {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.solution-impact {
  font-size: 11.5px;
  color: var(--color-pass);
  margin-top: 8px;
  padding: 6px 8px;
  background: var(--color-pass-subtle);
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-pass-border);
  font-family: var(--font-mono);
}

.solution-actions {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.what-if-select {
  background: var(--bg-panel);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 6px 10px;
  font-size: 12px;
  font-family: var(--font-mono);
  outline: none;
  cursor: pointer;
}

.what-if-select:focus {
  border-color: var(--border-focus);
}

/* ==========================================================================
   Modals & Drawers (Clean Zinc Styling)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-overlay.open {
  display: flex;
}

.modal-content {
  background: var(--bg-panel);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  width: 100%;
  max-width: 760px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
  overflow: hidden;
}

.modal-header {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
}

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

.modal-body {
  padding: 18px;
  overflow-y: auto;
  font-size: 12.5px;
  line-height: 1.55;
}

.audit-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 11.5px;
}

.audit-table th, .audit-table td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.audit-table th {
  background: var(--bg-surface);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.05em;
}

.tag-relevant {
  background: var(--color-pass-subtle);
  color: var(--color-pass);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 10.5px;
}

.tag-discarded {
  background: var(--color-fail-subtle);
  color: var(--color-fail);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 10.5px;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xs);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Models Explorer Modal Styling */
.models-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  font-size: 12px;
}

.models-table th, .models-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}

.models-table th {
  background: var(--bg-surface);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.06em;
}

.models-table tr:hover td {
  background: var(--bg-surface-hover);
}

.model-entry-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.model-entry-meta {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 2px;
}

.file-link-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 7px;
  border-radius: var(--radius-xs);
  font-size: 11px;
  font-family: var(--font-mono);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
}

.file-link-chip.linked {
  border-color: var(--color-pass-border);
  background: var(--color-pass-subtle);
  color: var(--color-pass);
}

.file-link-chip.missing {
  border-color: var(--border-subtle);
  color: var(--text-dim);
}

/* ==========================================================================
   CAD Toast Notification System (Sleek non-blocking toasts)
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
  max-width: 420px;
}

.cad-toast {
  pointer-events: auto;
  background: rgba(17, 17, 20, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  box-shadow: 0 12px 30px -5px rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  animation: toastSlideIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.cad-toast.toast-fadeout {
  opacity: 0;
  transform: translateY(8px);
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toast-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 1px;
}

.cad-toast.success .toast-icon {
  color: var(--color-pass);
}

.cad-toast.error .toast-icon {
  color: var(--color-fail);
}

.cad-toast.warn .toast-icon {
  color: var(--color-warn);
}

.cad-toast.info .toast-icon {
  color: var(--accent);
}

.toast-body {
  flex: 1;
  min-width: 0;
}

.toast-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.toast-msg {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 3px;
  line-height: 1.4;
  word-break: break-word;
}

.toast-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0 2px;
  font-size: 14px;
  line-height: 1;
  margin-top: -1px;
}

.toast-close:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   Header Solver Status Chip
   ========================================================================== */
.solver-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 10.5px;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-muted);
  margin-left: 6px;
}

.solver-chip.linked {
  border-color: var(--color-pass-border);
  background: var(--color-pass-subtle);
  color: var(--color-pass);
}

.solver-chip.unlinked {
  border-color: rgba(245, 158, 11, 0.3);
  background: rgba(245, 158, 11, 0.08);
  color: var(--color-warn);
}

/* ==========================================================================
   CAD Info Modal Stats Grid
   ========================================================================== */
.modal-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 8px;
  margin: 14px 0;
}

.modal-stat-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 10px;
  text-align: center;
}

.modal-stat-box.pass {
  border-color: var(--color-pass-border);
  background: var(--color-pass-subtle);
}

.modal-stat-box.fail {
  border-color: var(--color-fail-border);
  background: var(--color-fail-subtle);
}

.modal-stat-num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
}

.modal-stat-box.pass .modal-stat-num {
  color: var(--color-pass);
}

.modal-stat-box.fail .modal-stat-num {
  color: var(--color-fail);
}

.modal-stat-label {
  font-size: 9.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Inspector Model Overview & Solver Diagnostics Panel
   ========================================================================== */
.inspector-overview-panel {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.overview-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.overview-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.overview-card-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
}

.overview-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

.overview-metric-item {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 8px 10px;
}

.overview-metric-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.overview-metric-lbl {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

.solver-status-box {
  border-radius: var(--radius-xs);
  padding: 10px 12px;
  border: 1px solid var(--border-subtle);
  margin-bottom: 8px;
}

.solver-status-box.linked {
  background: var(--color-pass-subtle);
  border-color: var(--color-pass-border);
}

.solver-status-box.unlinked {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.25);
}

.solver-status-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.solver-status-title {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.solver-status-badge {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: var(--radius-xs);
}

.solver-status-badge.pass {
  background: rgba(34, 197, 94, 0.2);
  color: var(--color-pass);
}

.solver-status-badge.warn {
  background: rgba(245, 158, 11, 0.2);
  color: var(--color-warn);
}

.solver-detail-text {
  font-size: 11px;
  color: var(--text-secondary);
  line-height: 1.45;
}

.inspector-nav-back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
  margin-bottom: 10px;
  border-radius: var(--radius-xs);
}

.inspector-nav-back:hover {
  color: var(--text-primary);
  background: var(--bg-surface-hover);
}


/* ==========================================================================
   Design / results cards (parsed from the STAAD .ANL)
   ========================================================================== */
.design-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 10px 12px;
  margin-top: 10px;
  font-size: 11.5px;
}
.design-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; font-size: 10px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 8px; }
.design-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 12px; margin-bottom: 8px; }
.design-row { display: flex; flex-direction: column; gap: 1px; min-width: 0; padding: 4px 0; border-bottom: 1px solid var(--border-subtle); }
.design-row span { font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-dim); }
.design-row b { font-family: var(--font-mono); font-size: 11px; color: var(--text-primary); font-weight: 600; word-break: break-word; }
.design-row b.pass { color: var(--color-pass); } .design-row b.warn { color: var(--color-warn); } .design-row b.fail { color: var(--color-fail); }
.design-table { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 10px; margin: 4px 0 6px; }
.design-table th, .design-table td { border: 1px solid var(--border-subtle); padding: 3px 5px; text-align: right; white-space: nowrap; }
.design-table th:first-child, .design-table td:first-child { text-align: left; font-family: var(--font-sans); color: var(--text-muted); text-transform: uppercase; font-size: 9px; letter-spacing: 0.04em; }
.design-table td i { color: var(--text-dim); font-style: normal; }
.design-note { font-size: 11px; color: var(--text-secondary); line-height: 1.45; margin-top: 4px; }
.chk-notice { font-size: 11px; line-height: 1.5; margin: 6px 0 8px; padding: 7px 9px; border: 1px solid #b7791f; border-left-width: 4px; background: rgba(183,121,31,.14); color: #fde68a; }
.chk-notice select { margin-left: 4px; max-width: 100%; font-size: 11px; background: var(--bg-surface, #1f2328); color: inherit; border: 1px solid #b7791f; padding: 2px 4px; }
.design-note.warn { color: #fde68a; } .design-note.fail { color: var(--color-fail); }
.msg-row { display: grid; grid-template-columns: auto 1fr auto; gap: 8px; align-items: baseline; padding: 5px 0; border-top: 1px solid var(--border-subtle); font-size: 11px; line-height: 1.4; }
.msg-row b { font-size: 9.5px; letter-spacing: 0.06em; }
.msg-row.warning b { color: var(--color-warn); } .msg-row.error b { color: var(--color-fail); } .msg-row.note b { color: #60a5fa; }
.msg-row i { font-style: normal; color: var(--text-dim); font-family: var(--font-mono); font-size: 10px; }
.status-badge.none { color: var(--text-muted); border-color: var(--border-medium); background: var(--bg-surface); }
.design-card::-webkit-scrollbar { height: 6px; }
#design-card { overflow-x: auto; }

/* Code-check records */
.det-sketch { display: flex; gap: 10px; flex-wrap: wrap; margin: 6px 0; }
.det-sketch figure { margin: 0; text-align: center; font-size: 9px; color: var(--text-muted); }
.det-sketch svg { background: var(--bg-panel); border: 1px solid var(--border-subtle); }
.det-assume { font-size: 10.5px; color: var(--text-secondary); margin: 4px 0 6px; padding-left: 14px; }
.det-assume li { margin: 2px 0; }
.det-opts { font-size: 11px; line-height: 1.6; }
.det-opts label { display: grid; grid-template-columns: 1fr 90px; gap: 8px; align-items: center; margin: 3px 0; }
.det-opts input[type=number], .det-opts select { font-size: 11px; padding: 3px 5px; background: var(--bg-panel); color: inherit; border: 1px solid var(--border-medium); }
.det-link { font-size: 10px; color: var(--color-accent); cursor: pointer; text-decoration: underline; margin-left: 6px; }
.chk-chip { font-size: 9px; font-weight: 700; letter-spacing: 0.08em; padding: 2px 6px; border-radius: 2px; border: 1px solid var(--border-medium); color: var(--text-muted); background: var(--bg-panel); white-space: nowrap; }
.chk-chip.pass { color: var(--color-pass); border-color: var(--color-pass-border); background: var(--color-pass-subtle); }
.chk-chip.warning { color: var(--color-warn); border-color: var(--color-warn-border); background: var(--color-warn-subtle); }
.chk-chip.fail { color: var(--color-fail); border-color: var(--color-fail-border); background: var(--color-fail-subtle); }
.chk { border-top: 1px solid var(--border-subtle); }
.chk summary { display: grid; grid-template-columns: auto 1fr auto; grid-template-areas: "chip title ratio" "chip clause ratio"; gap: 0 8px; align-items: center; padding: 7px 0; cursor: pointer; list-style: none; }
.chk summary::-webkit-details-marker { display: none; }
.chk summary .chk-chip { grid-area: chip; } .chk-title { grid-area: title; font-weight: 600; font-size: 11.5px; color: var(--text-primary); }
.chk-clause { grid-area: clause; font-size: 10px; color: var(--text-dim); } .chk-ratio { grid-area: ratio; font-family: var(--font-mono); font-weight: 700; font-size: 12px; color: var(--text-secondary); }
.chk.fail .chk-ratio { color: var(--color-fail); } .chk.warning .chk-ratio { color: var(--color-warn); } .chk.pass .chk-ratio { color: var(--color-pass); }
.chk-body { padding: 2px 0 10px 4px; font-size: 11px; color: var(--text-secondary); line-height: 1.5; }
.chk-body p { margin: 4px 0 8px; } .chk-verdict { color: var(--text-primary); font-weight: 500; }
.chk-h { font-size: 9.5px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-dim); margin: 8px 0 3px; }
.chk-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.chk-kv { display: grid; grid-template-columns: 1fr auto; gap: 0 8px; padding: 2px 0; border-bottom: 1px dotted var(--border-subtle); }
.chk-kv span { color: var(--text-muted); } .chk-kv b { font-family: var(--font-mono); font-weight: 600; color: var(--text-primary); text-align: right; }
.chk-kv i { grid-column: 1 / -1; font-style: normal; font-size: 10px; color: var(--text-dim); }
.chk-body ul { margin: 2px 0 4px 16px; } .chk-verify { color: #fde68a; font-size: 10.5px; }
@media (max-width: 760px) { .chk-cols { grid-template-columns: 1fr; } }

.chk-group { margin-top: 8px; }
.chk-group-head { display: flex; align-items: center; gap: 8px; font-size: 10.5px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-secondary); padding: 6px 0 2px; border-top: 2px solid var(--border-medium); }
.chk-group-head i { font-style: normal; font-weight: 500; text-transform: none; letter-spacing: 0; color: var(--text-dim); margin-left: auto; font-size: 10px; }
#chk-occupancy { color: #60a5fa; }

/* Interpreted STAAD messages and glossary */
.msg { border-top: 1px solid var(--border-subtle); }
.msg summary { display: grid; grid-template-columns: auto 1fr auto auto; gap: 8px; align-items: center; padding: 6px 0; cursor: pointer; list-style: none; font-size: 11px; }
.msg summary::-webkit-details-marker { display: none; }
.msg summary b { font-size: 9px; letter-spacing: 0.08em; padding: 2px 5px; border: 1px solid var(--border-medium); border-radius: 2px; color: var(--text-muted); }
.msg.error summary b { color: var(--color-fail); border-color: var(--color-fail-border); } .msg.warning summary b { color: var(--color-warn); border-color: var(--color-warn-border); } .msg.note summary b, .msg.info summary b { color: #60a5fa; border-color: var(--color-accent-border); }
.msg-title { font-weight: 600; color: var(--text-primary); } .msg-count { font-family: var(--font-mono); color: var(--text-dim); font-size: 10px; }
.msg summary i { font-style: normal; font-family: var(--font-mono); font-size: 10px; color: var(--text-dim); }
.msg-body { padding: 0 0 8px 2px; font-size: 11px; color: var(--text-secondary); line-height: 1.5; } .msg-body p { margin: 3px 0 6px; } .msg-body ul { margin: 0 0 6px 16px; }
.msg-text { font-family: var(--font-mono); font-size: 10px; color: var(--text-muted); white-space: pre-wrap; } .msg-ref { color: var(--text-dim); font-size: 10px; }
.msg-members a { color: #60a5fa; margin-right: 4px; font-family: var(--font-mono); }
.gloss { border-top: 1px solid var(--border-subtle); } .gloss summary { padding: 7px 0; cursor: pointer; list-style: none; display: flex; gap: 10px; align-items: baseline; font-size: 12px; }
.gloss summary::-webkit-details-marker { display: none; } .gloss summary b { color: var(--text-primary); } .gloss summary span { font-size: 10px; color: var(--text-dim); }
.gloss .msg-body { font-size: 12px; }