/* ==========================================================================
   Staging Calculator & CAD Designer - Industrial Design System
   Crafted adhering to: /impeccable, /apple-design, /emil-design-eng, /antislop
   ========================================================================== */

:root {
  /* Surface Tokens - Deep Structural Carbon Palette */
  --bg-ground: #0a0b0e;
  --bg-panel: #12141a;
  --bg-surface: #171a22;
  --bg-surface-hover: #1e222c;
  --bg-surface-active: #232836;
  
  /* Legacy aliases for backward compatibility */
  --bg-primary: var(--bg-ground);
  --bg-secondary: var(--bg-panel);
  --bg-tertiary: var(--bg-surface);
  --card-bg: var(--bg-panel);
  
  /* Border & Separation Tokens */
  --card-border: #232733;
  --card-border-hover: #363d4e;
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-focus: #f59e0b;
  
  /* Accent Tokens - High-Visibility Industrial Safety Gold */
  --accent-primary: #f59e0b;
  --accent-primary-hover: #fbbf24;
  --accent-primary-dark: #d97706;
  --accent-secondary: #f4f4f5;
  
  /* Typography Colors */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #8596ac;
  
  /* Semantic Status Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --danger-border: rgba(239, 68, 68, 0.25);
  
  /* Fonts */
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  /* Geometry & Radii */
  --border-radius-lg: 10px;
  --border-radius-md: 6px;
  --border-radius-sm: 4px;
  --border-radius-full: 9999px;
  
  /* Motion & Curves - Emil Kowalski & Apple Design Specifications */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-fast: 100ms var(--ease-out);
  --transition-normal: 180ms var(--ease-out);
  --transition-speed: 0.15s;
  
  /* Elevation Shadows - Crisp Neutral Mechanical Depth */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-inner: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

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

html {
  color-scheme: dark;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-ground);
  background-image: 
    radial-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(180deg, #090a0d 0%, #12141a 100%);
  background-size: 24px 24px, 100% 100%;
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* Tabular numbers for all data displays */
input[type="number"],
.kpi-val,
.summary-table td,
.bom-item-qty,
.svg-deck-label,
.svg-dimension-text {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------------
   Layout Shell
   -------------------------------------------------------------------------- */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 1.25rem 1.5rem;
  max-width: 1620px;
  margin: 0 auto;
  gap: 1.25rem;
}

/* --------------------------------------------------------------------------
   Header Bar
   -------------------------------------------------------------------------- */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(18, 20, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm), var(--shadow-inner);
  border-radius: var(--border-radius-lg);
  padding: 0.75rem 1.25rem;
  position: relative;
  z-index: 50;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.logo-icon {
  background: var(--bg-surface);
  border: 1px solid var(--card-border);
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  padding: 5px;
  flex-shrink: 0;
  transition: border-color var(--transition-normal);
}

.logo-icon:hover {
  border-color: var(--accent-primary);
}

.logo-text h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-primary);
}

.accent-text {
  color: var(--accent-primary);
}

.tagline {
  font-size: 0.775rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.01em;
}

/* Navigation Tabs */
.header-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--bg-ground);
  padding: 3px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--card-border);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.95rem;
  border-radius: var(--border-radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

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

.nav-link:active {
  transform: scale(0.97);
}

.nav-link.active {
  background: var(--bg-surface);
  border-color: var(--card-border);
  color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

.nav-link i {
  width: 16px;
  height: 16px;
}

/* Header Actions & Unit Switcher */
.header-actions {
  display: flex;
  align-items: center;
}

.unit-toggle-container {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.toggle-label {
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.toggle-switch-wrapper {
  position: relative;
}

.toggle-checkbox {
  display: none;
}

.toggle-switch-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 140px;
  height: 32px;
  background: var(--bg-ground);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  position: relative;
  padding: 2px;
  user-select: none;
  transition: border-color var(--transition-fast);
}

.toggle-switch-label:hover {
  border-color: var(--card-border-hover);
}

.toggle-option {
  flex: 1;
  text-align: center;
  font-size: 0.775rem;
  font-weight: 600;
  z-index: 2;
  color: var(--text-secondary);
  transition: color 150ms var(--ease-out);
}

.toggle-option.active {
  color: #0b0c10;
  font-weight: 700;
}

.toggle-slider {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 66px;
  height: 26px;
  background: var(--accent-primary);
  border-radius: var(--border-radius-sm);
  transition: transform 200ms var(--ease-spring);
  z-index: 1;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

.toggle-checkbox:checked + .toggle-switch-label .toggle-slider {
  transform: translateX(68px);
}

.toggle-checkbox:checked + .toggle-switch-label .toggle-option.active {
  color: #0b0c10;
}

/* --------------------------------------------------------------------------
   Main Workspace Layout
   -------------------------------------------------------------------------- */
.app-workspace {
  display: grid;
  grid-template-columns: 370px 1fr;
  gap: 1.25rem;
  align-items: start;
}

/* --------------------------------------------------------------------------
   Sidebar Controls Panel
   -------------------------------------------------------------------------- */
.sidebar-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.panel-section {
  background: var(--bg-panel);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm), var(--shadow-inner);
  border-radius: var(--border-radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
}

.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-title i {
  color: var(--accent-primary);
  width: 16px;
  height: 16px;
}

/* Form Inputs */
.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.input-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.unit-indicator {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 0.75rem;
  color: var(--text-muted);
  width: 15px;
  height: 15px;
  pointer-events: none;
}

.form-input {
  width: 100%;
  background-color: var(--bg-surface);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 0.55rem 0.75rem 0.55rem 2.1rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.875rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.form-input:hover {
  border-color: var(--card-border-hover);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  background-color: var(--bg-surface-hover);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.08);
}

.form-input[type="number"] {
  font-family: var(--font-mono);
  font-weight: 500;
}

/* Custom Select Dropdowns */
.select-wrapper {
  position: relative;
}

.select-wrapper::after {
  content: "";
  position: absolute;
  right: 0.85rem;
  width: 6px;
  height: 6px;
  border-right: 2px solid var(--text-secondary);
  border-bottom: 2px solid var(--text-secondary);
  transform: rotate(45deg) translateY(-2px);
  pointer-events: none;
  transition: transform var(--transition-fast);
}

.select-input {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  padding-right: 2rem;
}

/* --------------------------------------------------------------------------
   Segmented Controls
   -------------------------------------------------------------------------- */
.segmented-control {
  display: flex;
  background: var(--bg-ground);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 3px;
  gap: 2px;
}

.segmented-control input[type="radio"] {
  display: none;
}

.segmented-control .segment-btn {
  flex: 1;
  text-align: center;
  padding: 0.45rem 0.35rem;
  cursor: pointer;
  border-radius: var(--border-radius-sm);
  border: 1px solid transparent;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1px;
  user-select: none;
}

.segmented-control .segment-btn:active {
  transform: scale(0.97);
}

.segmented-control .segment-btn .btn-title {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

.segmented-control .segment-btn .btn-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.segmented-control input[type="radio"]:checked + .segment-btn {
  background: var(--bg-surface);
  border-color: var(--card-border);
  box-shadow: var(--shadow-sm);
}

.segmented-control input[type="radio"]:checked + .segment-btn .btn-title {
  color: var(--accent-primary);
}

.segmented-control input[type="radio"]:checked + .segment-btn .btn-desc {
  color: var(--text-secondary);
}

.segmented-control.text-only .segment-btn {
  padding: 0.45rem 0.6rem;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.segmented-control.text-only input[type="radio"]:checked + .segment-btn {
  color: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   Accessory Controls & Switch Toggles
   -------------------------------------------------------------------------- */
.accessory-toggle-box {
  background: transparent;
  border-top: 1px solid var(--card-border);
  padding: 0.85rem 0 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

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

.toggle-title-desc {
  display: flex;
  flex-direction: column;
}

.toggle-title-desc .title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

.toggle-title-desc .desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* iOS / Apple-Style Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 22px;
  flex-shrink: 0;
}

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

.switch .slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-ground);
  border: 1px solid var(--card-border);
  transition: background-color 200ms var(--ease-out), border-color 200ms var(--ease-out);
}

.switch .slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-muted);
  transition: transform 200ms var(--ease-spring), background-color 200ms var(--ease-out);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

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

.switch input:checked + .slider:before {
  transform: translateX(16px);
  background-color: #0b0c10;
}

.switch .slider.round {
  border-radius: var(--border-radius-full);
}

.switch .slider.round:before {
  border-radius: 50%;
}

/* Accessory Sub-details / Perimeter Checkboxes */
.accessory-subdetails {
  border-top: 1px solid var(--card-border);
  padding-top: 0.65rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  animation: slideDown 150ms var(--ease-out);
}

.sub-label {
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sides-selector-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.45rem;
}

.side-checkbox {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.25rem 0;
}

.side-checkbox input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  background-color: var(--bg-ground);
  border: 1px solid var(--card-border);
  width: 16px;
  height: 16px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  display: grid;
  place-content: center;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  flex-shrink: 0;
}

.side-checkbox input[type="checkbox"]:active {
  transform: scale(0.92);
}

.side-checkbox input[type="checkbox"]:checked {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.side-checkbox input[type="checkbox"]::before {
  content: "";
  width: 9px;
  height: 9px;
  transform: scale(0);
  transition: 100ms transform ease-in-out;
  box-shadow: inset 1em 1em #0b0c10;
  transform-origin: center;
  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}

.side-checkbox input[type="checkbox"]:checked::before {
  transform: scale(1);
}

.side-checkbox label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  transition: color var(--transition-fast);
}

.side-checkbox label:hover {
  color: var(--text-primary);
}

.hidden {
  display: none !important;
}

/* --------------------------------------------------------------------------
   Main Workspace Panels & Cards
   -------------------------------------------------------------------------- */
.main-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  min-width: 0;
}

.card,
.visualizer-panel,
.visualizer-card {
  background: var(--bg-panel);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm), var(--shadow-inner);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  position: relative;
}

.panel-header,
.card-header {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--card-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.panel-header-title,
.card-header-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.panel-header-title i,
.card-header-title i {
  color: var(--accent-primary);
  width: 16px;
  height: 16px;
}

.panel-header h3,
.card-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Visualizer Controls & Toolbars */
.visualizer-tools {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.tool-btn {
  background: var(--bg-surface);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  width: 30px;
  height: 30px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

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

.tool-btn:active {
  transform: scale(0.94);
}

.tool-btn.active {
  background: var(--accent-primary);
  color: #0b0c10;
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

.tool-btn i {
  width: 15px;
  height: 15px;
}

.visualizer-tools .divider {
  width: 1px;
  height: 16px;
  background: var(--card-border);
  margin: 0 0.2rem;
}

/* --------------------------------------------------------------------------
   Stage Visualizer Viewport (SVG & Blueprint)
   -------------------------------------------------------------------------- */
.visualizer-content {
  position: relative;
  height: 520px;
  background-color: #07080b;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

#stage-svg {
  width: 100%;
  height: 100%;
  min-height: 100%;
  flex: 1;
  cursor: grab;
  display: block;
}

#stage-svg:active {
  cursor: grabbing;
}

/* Blueprint Visualization Legend */
.visualization-legend {
  position: absolute;
  bottom: 0.85rem;
  left: 0.85rem;
  background: rgba(18, 20, 26, 0.85);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--border-radius-md);
  padding: 0.35rem 0.65rem;
  display: flex;
  gap: 0.85rem;
  font-size: 0.775rem;
  pointer-events: none;
  z-index: 5;
  user-select: none;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.legend-color {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.deck-legend {
  background: var(--bg-surface);
  border: 1px solid #4a5165;
}

.cut-legend {
  background: rgba(239, 68, 68, 0.15);
  border: 1px dashed var(--danger);
}

.rail-legend {
  background: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   Dynamic SVG Render Elements
   -------------------------------------------------------------------------- */
.svg-deck {
  fill: #141720;
  stroke: #383f52;
  stroke-width: 1.5;
  rx: 2px;
  ry: 2px;
  transition: fill var(--transition-fast), stroke var(--transition-fast);
  cursor: pointer;
}

.svg-deck:hover {
  fill: #1c212f;
  stroke: var(--accent-primary);
}

.svg-deck-cut {
  fill: rgba(239, 68, 68, 0.08);
  stroke: var(--danger);
  stroke-width: 1.5;
  stroke-dasharray: 4 2;
  rx: 2px;
  ry: 2px;
}

.svg-deck-cut:hover {
  fill: rgba(239, 68, 68, 0.16);
}

.svg-deck-label {
  fill: var(--text-secondary);
  font-size: 11px;
  font-family: var(--font-mono);
  pointer-events: none;
  text-anchor: middle;
  dominant-baseline: middle;
  font-weight: 500;
}

.svg-deck-hover-label {
  fill: var(--accent-primary);
  font-weight: 700;
}

.svg-rail {
  stroke: var(--accent-primary);
  stroke-width: 3.5;
  stroke-linecap: round;
}

.svg-stage-outline {
  fill: none;
  stroke: var(--card-border-hover);
  stroke-width: 2;
  stroke-dasharray: 4 4;
  pointer-events: none;
}

.svg-dimension-line {
  stroke: var(--text-muted);
  stroke-width: 1;
  stroke-dasharray: 2 2;
}

.svg-dimension-text {
  fill: var(--text-secondary);
  font-size: 11px;
  font-family: var(--font-mono);
  text-anchor: middle;
  font-weight: 500;
}

.svg-measurement-marker {
  fill: var(--text-muted);
}

.svg-connector-dot {
  fill: var(--bg-ground);
  stroke: var(--text-secondary);
  stroke-width: 1.5;
  r: 3;
}

.svg-connection-bolt {
  fill: var(--accent-primary);
  stroke: var(--bg-ground);
  stroke-width: 1;
  r: 3;
}

/* Placed Active Shape Selection in CAD Designer */
.svg-deck-active {
  stroke: var(--accent-primary) !important;
  stroke-width: 2.5 !important;
  fill: #1e2433 !important;
}

/* --------------------------------------------------------------------------
   KPI Summary Dashboard
   -------------------------------------------------------------------------- */
.summary-dashboard {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.kpi-card,
.kpi-stat {
  background: var(--bg-panel);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm), var(--shadow-inner);
  border-radius: var(--border-radius-lg);
  padding: 1.1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.kpi-card:hover,
.kpi-stat:hover {
  border-color: var(--card-border-hover);
  box-shadow: var(--shadow-md);
}

.kpi-card.highlight-card,
.kpi-stat.highlight-card {
  border-color: rgba(245, 158, 11, 0.4);
}

.kpi-icon {
  background: var(--bg-surface);
  width: 46px;
  height: 46px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.highlight-card .kpi-icon {
  background: var(--accent-primary);
  color: #0b0c10;
}

.kpi-icon i {
  width: 20px;
  height: 20px;
}

.kpi-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.kpi-label {
  font-size: 0.775rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.kpi-val {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.kpi-sub {
  font-size: 0.775rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --------------------------------------------------------------------------
   Dashboard Details & Spec Tables
   -------------------------------------------------------------------------- */
.dashboard-details {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 1.25rem;
}

.details-section {
  background: var(--bg-panel);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm), var(--shadow-inner);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 280px;
}

.table-container {
  padding: 0.85rem 1.25rem;
  flex: 1;
}

.summary-table {
  width: 100%;
  border-collapse: collapse;
}

.summary-table th, .summary-table td {
  padding: 0.65rem 0;
  text-align: left;
  border-bottom: 1px solid var(--card-border);
  font-size: 0.85rem;
}

.summary-table th {
  color: var(--text-secondary);
  font-weight: 500;
  width: 45%;
}

.summary-table td {
  color: var(--text-primary);
  font-weight: 600;
  font-family: var(--font-mono);
}

.summary-table tr:last-child th, .summary-table tr:last-child td {
  border-bottom: none;
}

/* Bill of Materials List */
.bom-list-wrapper {
  padding: 0.85rem 1.25rem;
  flex: 1;
}

.bom-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.bom-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  border-bottom: 1px solid var(--card-border);
  padding: 0.65rem 0.25rem;
  transition: background-color var(--transition-fast);
}

.bom-item:last-child {
  border-bottom: none;
}

.bom-item:hover {
  background: rgba(255, 255, 255, 0.02);
}

.bom-item-name {
  display: flex;
  flex-direction: column;
}

.bom-item-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

.bom-item-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.bom-item-qty {
  background: var(--bg-ground);
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.825rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--card-border);
}

/* --------------------------------------------------------------------------
   Custom Stage Designer Styles
   -------------------------------------------------------------------------- */
.designer-shapes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  padding: 0.25rem 0;
}

.shape-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 0.55rem 0.85rem;
  cursor: grab;
  user-select: none;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.shape-item:hover {
  border-color: var(--accent-primary);
  background: var(--bg-surface-hover);
}

.shape-item:active {
  cursor: grabbing;
  transform: scale(0.98);
}

.shape-preview-box {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-ground);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  flex-shrink: 0;
}

.shape-preview-svg {
  width: 100%;
  height: 100%;
}

.shape-details {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.shape-title {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--text-primary);
}

.shape-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.canvas-toolbar {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
  padding: 0.5rem 0.85rem;
  background: rgba(18, 20, 26, 0.95);
  border-bottom: 1px solid var(--card-border);
}

.canvas-instruction {
  margin-left: auto;
  font-size: 0.775rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.canvas-instruction kbd {
  background: var(--bg-surface);
  border: 1px solid var(--card-border);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-size: 0.75rem;
}

/* 3D Preview Mode Dimming State */
.view-3d-active .panel-section:not(#inspector-panel),
.view-3d-active #btn-rotate-shape,
.view-3d-active #btn-delete-shape,
.view-3d-active #btn-clear-canvas,
.view-3d-active #btn-snap-grid {
  opacity: 0.35;
  pointer-events: none;
  transition: opacity 180ms var(--ease-out);
}

/* Custom Dropdown Overlays */
.custom-dropdown-container {
  position: relative;
}

.dropdown-menu-overlay {
  position: absolute;
  top: 100%;
  left: 1.5rem;
  right: 1.5rem;
  background: var(--bg-panel);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  max-height: 320px;
  overflow-y: auto;
  z-index: 999;
  box-shadow: var(--shadow-lg);
  padding: 0.5rem;
  margin-top: 6px;
  animation: modalScaleIn 160ms var(--ease-out);
}

/* --------------------------------------------------------------------------
   Action Buttons & Triggers
   -------------------------------------------------------------------------- */
.btn-primary {
  background: var(--accent-primary);
  color: #0b0c10;
  border: 1px solid var(--accent-primary);
  font-weight: 700;
  padding: 0.6rem 1.25rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-family: inherit;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  border-color: var(--accent-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: scale(0.97);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--card-border);
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-family: inherit;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

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

.btn-secondary:active {
  transform: scale(0.97);
}

.btn-designer-input {
  width: 100%;
  background-color: var(--bg-surface);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.6rem 1rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-family: inherit;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-designer-input:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.btn-designer-input:active {
  transform: scale(0.97);
}

.btn-designer-danger {
  width: 100%;
  background-color: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger);
  font-weight: 600;
  padding: 0.6rem 1rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-family: inherit;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-designer-danger:hover {
  background-color: #dc2626;
  border-color: #dc2626;
  color: #ffffff;
}

.btn-designer-danger:active {
  transform: scale(0.97);
}

/* --------------------------------------------------------------------------
   Modal Dialog Architecture
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(7, 8, 11, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms var(--ease-out);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-panel);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-lg);
  width: 90%;
  max-width: 480px;
  box-shadow: var(--shadow-lg), var(--shadow-inner);
  overflow: hidden;
  transform: scale(0.96) translateY(6px);
  transition: transform 220ms var(--ease-spring);
}

.modal-overlay.open .modal-content {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--card-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
}

.modal-header h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.35rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--card-border);
}

.modal-close-btn:active {
  transform: scale(0.92);
}

.modal-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--card-border);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.01);
}

/* --------------------------------------------------------------------------
   SEO Guide & Technical Documentation Section
   -------------------------------------------------------------------------- */
.seo-guide-section {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--card-border);
  margin-bottom: 2rem;
  grid-column: 1 / -1;
}

.seo-guide-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.seo-guide-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 1.2em;
  background: var(--accent-primary);
  border-radius: 2px;
}

.seo-guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

.seo-content-block h3 {
  color: var(--accent-primary);
  margin-bottom: 0.85rem;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
}

.seo-content-block p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.seo-content-block ul {
  padding-left: 1.25rem;
  margin-bottom: 1rem;
}

.seo-content-block li {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.seo-faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.seo-faq-item {
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  background: var(--bg-surface);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.seo-faq-item[open] {
  border-color: var(--card-border-hover);
}

.seo-faq-item summary {
  padding: 0.85rem 1rem;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  outline: none;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.seo-faq-item summary::-webkit-details-marker {
  display: none;
}

.seo-faq-item summary::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--accent-primary);
  font-weight: 500;
  transition: transform var(--transition-fast);
}

.seo-faq-item[open] summary::after {
  content: '−';
}

.seo-faq-item summary:hover {
  color: var(--accent-primary);
}

.seo-faq-content {
  padding: 0 1rem 1rem 1rem;
  font-size: 0.825rem;
  line-height: 1.6;
  color: var(--text-secondary);
  border-top: 1px solid var(--card-border);
  padding-top: 0.75rem;
}

/* --------------------------------------------------------------------------
   Keyframe Animations
   -------------------------------------------------------------------------- */
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes modalScaleIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints (Antislop-Layoutmobile & Touch Polish)
   -------------------------------------------------------------------------- */
@media (max-width: 1100px) {
  .app-workspace {
    grid-template-columns: 1fr;
  }
  
  .sidebar-panel {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  
  .panel-section:last-child {
    grid-column: span 2;
  }
  
  .seo-guide-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .app-container {
    padding: 0.75rem;
    gap: 1rem;
  }
  
  .app-header {
    flex-direction: column;
    gap: 0.85rem;
    align-items: stretch;
    padding: 0.85rem 1rem;
  }
  
  .header-logo {
    justify-content: flex-start;
  }
  
  .header-nav {
    width: 100%;
    justify-content: center;
  }
  
  .header-nav .nav-link {
    flex: 1;
    justify-content: center;
    padding: 0.6rem 0.5rem;
    min-height: 44px; /* Touch target */
  }
  
  .header-actions {
    width: 100%;
  }
  
  .unit-toggle-container {
    justify-content: space-between;
    width: 100%;
  }
  
  .toggle-switch-label {
    height: 36px;
  }
  
  .toggle-slider {
    height: 30px;
    width: 66px;
  }
  
  .sidebar-panel {
    grid-template-columns: 1fr;
  }
  
  .panel-section:last-child {
    grid-column: span 1;
  }
  
  .kpi-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  
  .dashboard-details {
    grid-template-columns: 1fr;
  }
  
  .visualizer-content {
    height: 380px;
  }
  
  /* Touch target expansions for mobile */
  .tool-btn {
    width: 36px;
    height: 36px;
  }
  
  .form-input, .select-input {
    min-height: 44px;
    font-size: 16px; /* Prevents auto-zoom on iOS */
  }
  
  .segmented-control .segment-btn {
    min-height: 44px;
  }
  
  .switch {
    width: 44px;
    height: 26px;
  }
  
  .switch .slider:before {
    height: 18px;
    width: 18px;
  }
  
  .switch input:checked + .slider:before {
    transform: translateX(18px);
  }
  
  .canvas-instruction {
    display: none; /* Hide desktop keyboard hints on mobile */
  }
}

@media (max-width: 480px) {
  .input-grid {
    grid-template-columns: 1fr;
  }
  
  .sides-selector-grid {
    grid-template-columns: 1fr;
  }
  
  .seo-guide-section {
    padding: 1.25rem 1rem;
  }
}

/* --------------------------------------------------------------------------
   Accessibility: Reduced Motion Preference
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .tool-btn:active,
  .btn-primary:active,
  .btn-secondary:active,
  .nav-link:active,
  .segment-btn:active {
    transform: none !important;
  }
}