/* ==========================================================================
   fedu.vn/font Interactive Type Hub — Master Stylesheet
   Aesthetic: Editorial Brutalist / Swiss Modern Type Foundry (Grilli / Pangram)
   Architecture: Pure CSS3, Tri-Theme Custom Properties, Single-Variable Batching
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Root Variables & Typography Stacks
   -------------------------------------------------------------------------- */
:root {
  /* System font stacks */
  --font-display: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  /* Type Tester Live Batching Variables (Controlled by Sliders at 60 FPS) */
  --tester-font-size: 36px;
  --tester-line-height: 1.2;
  --tester-letter-spacing: 0.00em;
  --tester-text-align: left;
  --tester-text-transform: none;

  /* Layout Dimensions */
  --max-content-width: 1440px;
  --header-height: 60px;
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;

  /* Transitions */
  --trans-fast: 120ms cubic-bezier(0.16, 1, 0.3, 1);
  --trans-normal: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Layer Indexing */
  --z-base: 1;
  --z-sticky: 100;
  --z-modal-backdrop: 900;
  --z-modal: 1000;
  --z-toast: 1100;
}

/* --------------------------------------------------------------------------
   2. Theme 1: Light Mode (Default — Clean Architectural Editorial)
   -------------------------------------------------------------------------- */
html[data-theme="light"],
:root {
  --bg-primary: #FFFFFF;
  --bg-surface: #F8F9FA;
  --bg-elevated: #FFFFFF;
  --bg-hover: #F1F3F5;

  --text-primary: #111111;
  --text-secondary: #555555;
  --text-tertiary: #888888;
  --text-inverse: #FFFFFF;

  --border-subtle: #E5E5E5;
  --border-strong: #CCCCCC;
  --border-focus: #111111;

  --accent-primary: #111111;
  --accent-hover: #333333;
  --accent-text: #FFFFFF;
  --accent-focus-ring: rgba(0, 0, 0, 0.2);
  --accent-glow: none;

  --badge-bg: #EEEEEE;
  --badge-text: #333333;
  --badge-border: #E0E0E0;
  --badge-vn-bg: #E6F8ED;
  --badge-vn-text: #0E853C;
  --badge-vn-border: #BCE8CC;

  --slider-track: #E2E4E8;
  --slider-fill: #111111;
  --slider-thumb: #111111;

  --toolbar-bg: rgba(255, 255, 255, 0.94);
  --modal-overlay: rgba(0, 0, 0, 0.55);
  --card-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

/* --------------------------------------------------------------------------
   3. Theme 2: Dark Mode (Grilli-Pangram Master Foundry)
   -------------------------------------------------------------------------- */
html[data-theme="dark"] {
  --bg-primary: #121212;
  --bg-surface: #1A1A1A;
  --bg-elevated: #242424;
  --bg-hover: #2E2E2E;

  --text-primary: #F5F5F7;
  --text-secondary: #A1A1A6;
  --text-tertiary: #6E6E73;
  --text-inverse: #121212;

  --border-subtle: #282828;
  --border-strong: #3D3D3D;
  --border-focus: #F5F5F7;

  --accent-primary: #FFFFFF;
  --accent-hover: #E5E5E5;
  --accent-text: #121212;
  --accent-focus-ring: rgba(255, 255, 255, 0.25);
  --accent-glow: none;

  --badge-bg: #222222;
  --badge-text: #D1D1D6;
  --badge-border: #333333;
  --badge-vn-bg: #112818;
  --badge-vn-text: #4EFA87;
  --badge-vn-border: #1B452D;

  --slider-track: #2C2C2E;
  --slider-fill: #F5F5F7;
  --slider-thumb: #FFFFFF;

  --toolbar-bg: rgba(18, 18, 18, 0.88);
  --modal-overlay: rgba(0, 0, 0, 0.82);
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* --------------------------------------------------------------------------
   4. Theme 3: Neon Accent Mode (Cyberpunk / Terminal Tech)
   -------------------------------------------------------------------------- */
html[data-theme="neon"] {
  --bg-primary: #0D0E15;
  --bg-surface: #141622;
  --bg-elevated: #1C1F30;
  --bg-hover: #252A42;

  --text-primary: #E0E6ED;
  --text-secondary: #8B95A5;
  --text-tertiary: #525D70;
  --text-inverse: #0D0E15;

  --border-subtle: #23283E;
  --border-strong: #363E5E;
  --border-focus: #00FF66;

  --accent-primary: #00FF66;
  --accent-hover: #26FF7D;
  --accent-text: #0D0E15;
  --accent-focus-ring: rgba(0, 255, 102, 0.35);
  --accent-glow: 0 0 16px rgba(0, 255, 102, 0.4);

  --badge-bg: #13241B;
  --badge-text: #00FF66;
  --badge-border: #1B452D;
  --badge-vn-bg: #13241B;
  --badge-vn-text: #00FF66;
  --badge-vn-border: #1B452D;

  --slider-track: #1C2333;
  --slider-fill: #00FF66;
  --slider-thumb: #00FF66;

  --toolbar-bg: rgba(13, 14, 21, 0.92);
  --modal-overlay: rgba(5, 6, 10, 0.88);
  --card-shadow: 0 4px 24px rgba(0, 255, 102, 0.1);
}

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

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background-color var(--trans-normal), color var(--trans-normal);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: transparent;
  border: none;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   6. Top Header Navigation
   -------------------------------------------------------------------------- */
.site-header {
  height: var(--header-height);
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-primary);
  position: relative;
  z-index: calc(var(--z-sticky) + 10);
}

.site-header__inner {
  max-width: var(--max-content-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.fonthub-logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  flex-shrink: 0;
  transition: transform var(--trans-fast);
}
.brand-logo-wrap:hover .fonthub-logo-icon {
  transform: scale(1.05);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.1;
}

.brand-sub {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.brand-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-switcher {
  display: inline-flex;
  padding: 3px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  gap: 2px;
}

.theme-btn {
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--trans-fast);
}

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

.theme-btn.active {
  background: var(--accent-primary);
  color: var(--accent-text);
}

/* --------------------------------------------------------------------------
   7. Sticky Frosted Type Tester Toolbar
   -------------------------------------------------------------------------- */
.type-tester-toolbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--toolbar-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.toolbar-container {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toolbar-row-top {
  display: flex;
  align-items: center;
  gap: 12px;
}

.input-wrap-main {
  position: relative;
  flex: 1;
}

.global-text-input {
  width: 100%;
  height: 40px;
  padding: 0 36px 0 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--trans-fast), box-shadow var(--trans-fast);
}

.global-text-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--accent-focus-ring);
}

.input-clear-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-tertiary);
  border-radius: 50%;
}

.input-clear-btn:hover {
  color: var(--text-primary);
}

.preset-select-wrap select {
  height: 40px;
  padding: 0 32px 0 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none' stroke='%23888888' stroke-width='1.5'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

.preset-select-wrap select:focus {
  border-color: var(--border-focus);
}

.toolbar-row-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.slider-group {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.slider-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.slider-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  min-width: 40px;
}

.slider-val {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-primary);
  min-width: 52px;
}

/* Custom range slider */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100px;
  height: 4px;
  background: var(--slider-track);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--slider-thumb);
  cursor: pointer;
  transition: transform var(--trans-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border: none;
  border-radius: 50%;
  background: var(--slider-thumb);
  cursor: pointer;
}

.button-controls-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.segmented-control {
  display: inline-flex;
  padding: 2px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-sm);
  gap: 2px;
}

.btn-seg {
  padding: 4px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 2px;
  color: var(--text-secondary);
  transition: all var(--trans-fast);
}

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

.btn-seg.active {
  background: var(--accent-primary);
  color: var(--accent-text);
}

.btn-reset-tester {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--trans-fast);
}

.btn-reset-tester:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

/* --------------------------------------------------------------------------
   8. Search & Faceted Filter Section
   -------------------------------------------------------------------------- */
.filter-section {
  max-width: var(--max-content-width);
  margin: 20px auto 0;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.search-bar-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-input-wrap {
  position: relative;
  flex: 1;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  height: 46px;
  padding: 0 80px 0 42px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--trans-fast), box-shadow var(--trans-fast);
}

.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--accent-focus-ring);
}

.search-latency-badge {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: var(--border-radius-sm);
  pointer-events: none;
}

.results-meta {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* Category Filter Chips */
.chips-container {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.chip-btn {
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 100px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--trans-fast);
  white-space: nowrap;
}

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

.chip-btn.active {
  background: var(--accent-primary);
  color: var(--accent-text);
  border-color: var(--accent-primary);
  font-weight: 600;
}

.chip-count {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  opacity: 0.75;
}

/* Secondary Filter Row */
.secondary-filters-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 4px;
}

.filter-select {
  height: 34px;
  padding: 0 28px 0 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-sm);
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 12 12' fill='none' stroke='%23888888' stroke-width='1.5'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}

.filter-select:hover, .filter-select:focus {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.vn-toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.vn-toggle-checkbox {
  accent-color: var(--accent-primary);
  cursor: pointer;
}

.btn-clear-filters {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  cursor: pointer;
  text-decoration: underline;
  margin-left: auto;
}

.btn-clear-filters:hover {
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   9. Dynamic Font Specimen Grid
   -------------------------------------------------------------------------- */
.main-content {
  max-width: var(--max-content-width);
  margin: 24px auto 60px;
  padding: 0 24px;
}

.font-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 24px;
}

/* --------------------------------------------------------------------------
   10. Font Card Component
   -------------------------------------------------------------------------- */
.font-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  box-shadow: var(--card-shadow);
  transition: transform var(--trans-fast), border-color var(--trans-fast);
}

.font-card:hover {
  border-color: var(--border-strong);
}

/* Card Header */
.card-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.card-family-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.card-designer-row {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.card-badges-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--border-radius-sm);
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

.badge-vn {
  background: var(--badge-vn-bg);
  color: var(--badge-vn-text);
  border: 1px solid var(--badge-vn-border);
}

/* Specimen Area (Reactive to Global Sliders) */
.card-specimen-wrap {
  min-height: 90px;
  padding: 12px 0;
  border-top: 1px dashed var(--border-subtle);
  border-bottom: 1px dashed var(--border-subtle);
  display: flex;
  align-items: center;
}

.preview-text {
  width: 100%;
  font-size: var(--tester-font-size);
  line-height: var(--tester-line-height);
  letter-spacing: var(--tester-letter-spacing);
  text-align: var(--tester-text-align);
  text-transform: var(--tester-text-transform);
  outline: none;
  word-break: break-word;
  overflow-wrap: anywhere;
  cursor: text;
  transition: color var(--trans-fast);
}

.preview-text:focus {
  background: var(--bg-hover);
  border-radius: var(--border-radius-sm);
}

/* Weights Bar */
.card-weights-bar {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 6px;
  padding: 4px 2px 6px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.card-weights-bar::-webkit-scrollbar {
  height: 3px;
}

.card-weights-bar::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}

.weight-chip {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--trans-fast);
}

.weight-chip:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  background: var(--bg-hover);
}

.weight-chip.active {
  background: var(--accent-primary);
  color: var(--accent-text);
  font-weight: 700;
  border-color: var(--accent-primary);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

.title-with-fav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-fav {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  opacity: 0.35;
  transition: opacity var(--trans-fast), transform var(--trans-fast);
  padding: 2px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-fav:hover,
.btn-fav.active {
  opacity: 1;
  transform: scale(1.15);
}

.btn-copy-name {
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  color: var(--text-tertiary);
  opacity: 0.5;
  padding: 3px 5px;
  border-radius: var(--border-radius-sm);
  display: inline-flex;
  align-items: center;
  transition: all var(--trans-fast);
}

.btn-copy-name:hover {
  opacity: 1;
  color: var(--text-primary);
  background: var(--bg-hover);
  border-color: var(--border-subtle);
}

/* Metadata & Notes Drawer */
.card-drawer {
  font-size: 0.8rem;
  border-radius: var(--border-radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
}

.drawer-trigger {
  padding: 8px 12px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.drawer-trigger:hover {
  color: var(--text-primary);
}

.drawer-content {
  padding: 12px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.anatomy-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px 12px;
}

.anatomy-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
}

.anatomy-item .label {
  color: var(--text-tertiary);
}

.anatomy-item .val {
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.director-quote {
  font-style: italic;
  color: var(--text-secondary);
  font-size: 0.8rem;
  border-left: 2px solid var(--border-strong);
  padding-left: 8px;
}

/* Card Footer Actions */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 6px;
}

.btn-download-family {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  background: var(--accent-primary);
  color: var(--accent-text);
  cursor: pointer;
  transition: all var(--trans-fast);
  white-space: nowrap;
}

.btn-download-family:hover {
  background: var(--accent-hover);
  box-shadow: var(--accent-glow);
}

.secondary-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-icon-action {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 7px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--trans-fast);
}

.btn-icon-action:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

/* --------------------------------------------------------------------------
   11. Empty State & Scroll Sentinel
   -------------------------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.empty-state.hidden {
  display: none;
}

.empty-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.scroll-sentinel {
  height: 20px;
  width: 100%;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   12. Vietnamese Glyph Map Modal
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal-backdrop);
  background-color: var(--modal-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--trans-fast);
}

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

.modal-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--border-radius-lg);
  max-width: 900px;
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  transform: scale(0.96);
  transition: transform var(--trans-fast);
}

.modal-overlay.open .modal-dialog {
  transform: scale(1);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title-group h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-title-group p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.modal-close-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
}

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

.modal-tabs {
  padding: 10px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.modal-tab-btn {
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
}

.modal-tab-btn.active {
  background: var(--accent-primary);
  color: var(--accent-text);
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.glyph-group-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.glyph-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
  gap: 6px;
}

.glyph-cell {
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--trans-fast);
}

.glyph-cell:hover {
  background: var(--accent-primary);
  color: var(--accent-text);
  transform: translateY(-2px);
  border-color: var(--accent-primary);
}

.modal-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* Toast Notifications */
.toast-notice {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: var(--z-toast);
  background: var(--accent-primary);
  color: var(--accent-text);
  padding: 10px 18px;
  border-radius: var(--border-radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  opacity: 0;
  transform: translateY(12px);
  transition: all var(--trans-fast);
  pointer-events: none;
}

.toast-notice.show {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   13. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .font-grid {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
  }

  .slider-group {
    gap: 12px;
  }

  input[type="range"] {
    width: 80px;
  }
}

@media (max-width: 680px) {
  .site-header__inner {
    padding: 0 16px;
  }

  .toolbar-container {
    padding: 0 16px;
  }

  .filter-section {
    padding: 0 16px;
  }

  .main-content {
    padding: 0 16px;
  }

  .font-grid {
    grid-template-columns: 1fr;
  }

  .toolbar-row-top {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-row-bottom {
    flex-direction: column;
    align-items: stretch;
  }

  .slider-group {
    justify-content: space-between;
  }

  .button-controls-group {
    justify-content: space-between;
  }

  .card-footer {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-download-family {
    justify-content: center;
  }

  .secondary-actions {
    justify-content: center;
  }
}