/* ==========================================================================
   HeightCompare - Production CSS Architecture
   Mobile-first, Semantic, WCAG AA Accessible, Zero CLS, Light/Dark Modes
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Light Mode */
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-surface-muted: #f1f5f9;
  --bg-input: #ffffff;
  --bg-stage: #f8fafc;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --border-color: #e2e8f0;
  --border-color-hover: #cbd5e1;
  --border-color-focus: #4f46e5;

  --accent-primary: #4f46e5;
  --accent-primary-hover: #4338ca;
  --accent-light: #eef2ff;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);

  --color-success: #10b981;
  --color-success-light: #ecfdf5;
  --color-warning: #f59e0b;
  --color-warning-light: #fffbeb;
  --color-danger: #ef4444;
  --color-danger-light: #fef2f2;
  --color-info: #0ea5e9;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);

  /* Spacing & Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Container width */
  --max-width: 1200px;
}

/* Dark Mode Tokens */
[data-theme="dark"] {
  --bg-app: #090d16;
  --bg-surface: #131b2e;
  --bg-surface-elevated: #1a243d;
  --bg-surface-muted: #1c2742;
  --bg-input: #101626;
  --bg-stage: #0d1322;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --border-color: #263352;
  --border-color-hover: #374770;
  --border-color-focus: #818cf8;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.15);

  --color-success: #34d399;
  --color-success-light: rgba(52, 211, 153, 0.15);
  --color-warning: #fbbf24;
  --color-warning-light: rgba(251, 191, 36, 0.15);
  --color-danger: #f87171;
  --color-danger-light: rgba(248, 113, 113, 0.15);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

img, svg {
  display: block;
  max-width: 100%;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

/* Screen reader only utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus visibility for accessibility */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   3. Layout Structure
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* --------------------------------------------------------------------------
   4. Site Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.brand-logo {
  height: 2.25rem;
  width: auto;
}

.main-nav {
  display: none;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.5rem;
}

.nav-link {
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.5rem 0.25rem;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-primary);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.mobile-menu-btn {
  display: inline-flex;
}

/* Mobile Nav Drawer */
.mobile-nav-menu {
  display: none;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
}

.mobile-nav-menu.is-open {
  display: block;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mobile-nav-link {
  display: block;
  padding: 0.5rem 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 2.5rem 0 1.5rem;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background-color: var(--accent-light);
  color: var(--accent-primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 1.5rem;
}

.hero-cta-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   6. Buttons & Interactive Controls
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  text-decoration: none;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: var(--bg-surface-muted);
  border-color: var(--border-color-hover);
  text-decoration: none;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-pill {
  border-radius: var(--radius-full);
}

/* --------------------------------------------------------------------------
   7. Main Comparison Application Layout
   -------------------------------------------------------------------------- */
.app-section {
  padding: 1.5rem 0 3.5rem;
}

.app-workspace {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Top Toolbar */
.stage-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.preset-pills-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.25rem;
}

.preset-pill-btn {
  padding: 0.35rem 0.75rem;
  background-color: var(--bg-surface-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-pill-btn:hover {
  background-color: var(--accent-light);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* Visualizer Card Stage */
.stage-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  position: relative;
  transition: border-color var(--transition-normal);
}

.stage-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-surface-elevated);
}

.stage-title-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stage-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.stage-viewport-container {
  width: 100%;
  height: 480px;
  max-height: 70vh;
  min-height: 380px;
  background-color: var(--bg-stage);
  overflow-x: auto;
  overflow-y: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 0.5rem 0;
}

/* Custom scrollbar for stage viewport */
.stage-viewport-container::-webkit-scrollbar {
  height: 8px;
}
.stage-viewport-container::-webkit-scrollbar-track {
  background: var(--bg-surface-muted);
}
.stage-viewport-container::-webkit-scrollbar-thumb {
  background: var(--border-color-hover);
  border-radius: 4px;
}

#height-comparison-svg {
  height: 100%;
  width: auto;
  min-width: 600px;
  display: block;
}

.visual-person-group {
  cursor: pointer;
  outline: none;
  transition: opacity var(--transition-fast);
}

.empty-stage-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  padding: 3rem 1rem;
  text-align: center;
}

.empty-stage-state svg {
  margin-bottom: 1rem;
  stroke: var(--text-muted);
}

/* --------------------------------------------------------------------------
   8. Lower Workspace Grid: Inputs + Summary Table
   -------------------------------------------------------------------------- */
.workspace-lower-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* Person Inputs Panel */
.inputs-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.panel-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.panel-title {
  font-size: 1.2rem;
  font-weight: 700;
}

.people-cards-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

/* Individual Person Card */
.person-input-card {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: all var(--transition-fast);
}

.person-input-card:hover, .person-input-card:focus-within {
  border-color: var(--border-color-focus);
  box-shadow: var(--shadow-sm);
}

.card-top-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.person-number-badge {
  width: 1.85rem;
  height: 1.85rem;
  border-radius: var(--radius-full);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.person-name-wrapper {
  flex: 1;
}

.person-name-input {
  width: 100%;
  padding: 0.45rem 0.75rem;
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.person-name-input:focus {
  border-color: var(--accent-primary);
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.icon-action-btn {
  background: transparent;
  border: none;
  padding: 0.4rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

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

.icon-action-btn.text-danger:hover {
  background-color: var(--color-danger-light);
  color: var(--color-danger);
}

.card-middle-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.height-input-cluster {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.single-height-input-field {
  flex: 1;
}

.single-height-input, .height-feet-input, .height-inches-input {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.05rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.single-height-input:focus, .height-feet-input:focus, .height-inches-input:focus {
  border-color: var(--accent-primary);
}

.split-feet-inches-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
}

.split-input-field {
  position: relative;
  flex: 1;
}

.split-input-field input {
  padding-right: 2rem;
}

.unit-addon {
  position: absolute;
  right: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  pointer-events: none;
}

.unit-select, .gender-select {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
}

.card-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--border-color);
}

.height-equivalent-pill {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.color-picker-cluster {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.swatches-container {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.color-swatch-btn {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.color-swatch-btn:hover {
  transform: scale(1.2);
}

.color-swatch-btn.active {
  border-color: var(--text-primary);
  transform: scale(1.15);
}

.custom-color-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.2rem;
}

.custom-color-input {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.inline-validation-msg {
  font-size: 0.82rem;
  color: var(--color-danger);
  font-weight: 500;
  padding: 0.3rem 0.5rem;
  background-color: var(--color-danger-light);
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   9. Summary Stats Cards & Comparison Table
   -------------------------------------------------------------------------- */
.summary-and-table-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.summary-card-container {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.stat-card {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 1rem;
  border-radius: var(--radius-lg);
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
}

.stat-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  flex-shrink: 0;
}

.stat-tallest .stat-icon {
  background-color: var(--color-success-light);
  color: var(--color-success);
}

.stat-shortest .stat-icon {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
}

.stat-difference .stat-icon {
  background-color: var(--accent-light);
  color: var(--accent-primary);
}

.stat-average .stat-icon {
  background-color: var(--bg-surface-muted);
  color: var(--text-secondary);
}

.stat-meta {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-value {
  font-size: 1.3rem;
  font-weight: 800;
  line-height: 1.25;
}

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

.stat-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* Comparison Table */
.table-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
}

.table-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.comparison-table th {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--border-color);
}

.comparison-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.font-bold {
  font-weight: 700;
}

.font-mono {
  font-family: var(--font-mono);
}

.table-person-cell {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.color-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: var(--radius-full);
  display: inline-block;
  flex-shrink: 0;
}

.sub-cell {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: normal;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
}

.badge-tallest {
  background-color: var(--color-success-light);
  color: var(--color-success);
}

.badge-shortest {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
}

.badge-baseline {
  background-color: var(--bg-surface-muted);
  color: var(--text-muted);
}

.text-taller {
  color: var(--color-success);
}

/* --------------------------------------------------------------------------
   10. Mini Height Converter Widget
   -------------------------------------------------------------------------- */
.converter-widget-section {
  padding: 3rem 0;
  border-top: 1px solid var(--border-color);
}

.widget-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.widget-header {
  margin-bottom: 1.5rem;
}

.widget-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 0.35rem;
}

.converter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1rem;
}

.converter-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.converter-field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.converter-input-wrap {
  position: relative;
}

.converter-input-wrap input {
  width: 100%;
  padding: 0.65rem 2.2rem 0.65rem 0.75rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-primary);
}

.converter-input-wrap .unit-tag {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   11. Structured SEO Content Sections
   -------------------------------------------------------------------------- */
.content-section {
  padding: 3.5rem 0;
  border-top: 1px solid var(--border-color);
}

.article-content {
  max-width: 820px;
  margin: 0 auto;
}

.content-heading {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.content-subheading {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 2rem 0 0.85rem;
  color: var(--text-primary);
}

.content-paragraph {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.content-list {
  margin: 1rem 0 1.5rem 1.5rem;
  color: var(--text-secondary);
}

.content-list li {
  margin-bottom: 0.5rem;
}

/* FAQ Accordion */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.faq-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 1.2rem 1.5rem;
  text-align: left;
  background: none;
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-answer {
  padding: 0 1.5rem 1.2rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   12. Zero-CLS Ad Slot Placeholders
   -------------------------------------------------------------------------- */
.ad-slot-container {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 2rem 0;
  width: 100%;
}

.ad-slot-placeholder {
  width: 100%;
  max-width: 728px;
  min-height: 90px;
  background-color: var(--bg-surface-muted);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 1rem;
}

/* --------------------------------------------------------------------------
   13. Toast Notifications
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast-item {
  background-color: #0f172a;
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  transform: translateY(15px);
  transition: all var(--transition-fast);
  pointer-events: auto;
}

.toast-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.toast-item.toast-info {
  background-color: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   14. Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.5rem;
  max-width: 320px;
}

.footer-nav-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   14b. Contact Page & Form Styles
   -------------------------------------------------------------------------- */
.contact-page-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

@media (min-width: 900px) {
  .contact-page-grid {
    grid-template-columns: 1.25fr 1fr;
  }
}

.contact-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

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

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-label .required {
  color: var(--color-danger);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-light);
}

textarea.form-control {
  resize: vertical;
  min-height: 130px;
}

.form-error {
  font-size: 0.82rem;
  color: var(--color-danger);
  font-weight: 500;
  display: none;
}

.form-error.is-visible {
  display: block;
}

.contact-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-info-block {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.contact-icon-wrap {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  background-color: var(--accent-light);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-block-meta h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.contact-block-meta p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.contact-success-state {
  display: none;
  text-align: center;
  padding: 2.5rem 1.5rem;
}

.contact-success-state.is-visible {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.success-icon-badge {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-full);
  background-color: var(--color-success-light);
  color: var(--color-success);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

/* --------------------------------------------------------------------------
   14c. Blog Page & Admin Management Styles
   -------------------------------------------------------------------------- */
.blog-header-section {
  padding: 1.5rem 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.blog-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

.blog-search-wrap {
  position: relative;
  min-width: 260px;
  flex: 1;
  max-width: 420px;
}

.blog-search-input {
  width: 100%;
  padding: 0.65rem 1rem 0.65rem 2.4rem;
  font-size: 0.95rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.blog-search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.blog-search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.blog-categories-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.blog-cat-pill {
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.blog-cat-pill:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.blog-cat-pill.active {
  background-color: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

/* Blog Posts Grid */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  margin-top: 1rem;
}

@media (min-width: 640px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .blog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.blog-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  cursor: pointer;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-color-focus);
}

.blog-card-cover {
  height: 140px;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 1rem;
}

.blog-card-badge {
  background-color: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(6px);
  color: #ffffff;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.blog-card-body {
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.blog-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.65rem;
  color: var(--text-primary);
}

.blog-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex: 1;
}

.blog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-primary);
}

/* Article Reader View */
.reader-container {
  max-width: 820px;
  margin: 0 auto;
  padding: 1.5rem 0 3.5rem;
}

.reader-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.reader-back-btn:hover {
  color: var(--accent-primary);
}

.reader-cover-banner {
  height: 220px;
  border-radius: var(--radius-xl);
  margin-bottom: 2rem;
  display: flex;
  align-items: flex-end;
  padding: 1.5rem;
}

.reader-header {
  margin-bottom: 2rem;
}

.reader-meta-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.85rem;
}

.reader-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.reader-author-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.reader-body-content {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.reader-body-content h3 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 2rem 0 0.85rem;
}

.reader-body-content h4 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.5rem 0 0.65rem;
}

.reader-body-content p {
  margin-bottom: 1.35rem;
}

.reader-body-content ul, .reader-body-content ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.reader-body-content li {
  margin-bottom: 0.5rem;
}

.reader-body-content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2.5rem 0;
}

/* Hidden Admin Portal Styles */
.admin-pin-card {
  max-width: 440px;
  margin: 3rem auto;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.admin-lock-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-full);
  background-color: var(--accent-light);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
}

.admin-dashboard {
  display: none;
}

.admin-dashboard.is-unlocked {
  display: block;
}

.admin-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.admin-stat-card {
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.admin-editor-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 992px) {
  .admin-editor-layout {
    grid-template-columns: 1.3fr 1fr;
  }
}

.gradient-picker-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.gradient-option-btn {
  height: 44px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
}

.gradient-option-btn.active {
  border-color: var(--text-primary);
  transform: scale(1.05);
}

/* --------------------------------------------------------------------------
   15. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (min-width: 640px) {
  .hero-title {
    font-size: 2.85rem;
  }
  
  .card-middle-row {
    grid-template-columns: 1.5fr 1fr;
  }
}

@media (min-width: 768px) {
  .main-nav {
    display: block;
  }

  .mobile-menu-btn {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: 3.25rem;
  }

  .workspace-lower-grid {
    grid-template-columns: 1.15fr 1fr;
  }
}

/* --------------------------------------------------------------------------
   16. Print Stylesheet
   -------------------------------------------------------------------------- */
@media print {
  body {
    background-color: #ffffff !important;
    color: #000000 !important;
  }

  .site-header, .site-footer, .stage-toolbar, .hero-cta-row, .ad-slot-container, .btn, .icon-action-btn, .mobile-nav-menu {
    display: none !important;
  }

  .stage-card, .table-card, .summary-card-container {
    box-shadow: none !important;
    border: 1px solid #000000 !important;
  }
}