/**
 * TurBayUI v0.5 - Authentic Samsung One UI 6/7 Inspired Design System
 * Calm, ultra-refined, ergonomic, zero neon, gentle pastel accents, squircle surfaces.
 */

:root {
  /* Samsung One UI Core Palette */
  --tb-primary: #0072DE;
  --tb-primary-hover: #0060BD;
  --tb-primary-active: #00509E;
  --tb-primary-subtle: #EBF4FC;
  --tb-primary-border: #BCD9F8;

  /* Natural One UI Pastel Functional Colors */
  --tb-green: #198754;
  --tb-green-subtle: #E8F5E9;
  --tb-amber: #D97706;
  --tb-amber-subtle: #FEF3C7;
  --tb-red: #E02424;
  --tb-red-subtle: #FDE8E8;
  --tb-purple: #7E22CE;
  --tb-purple-subtle: #F3E8FF;
  --tb-accent-green: var(--tb-green);

  /* Surfaces & Hierarchy (Clean Soft Off-White to Pure White) */
  --tb-bg-canvas: #F2F4F8;
  --tb-bg-surface: #FFFFFF;
  --tb-bg-card: var(--tb-bg-surface);
  --tb-bg-subtle: #F6F8FB;
  --tb-bg-hover: #EAEFF6;
  --tb-bg-inset: #EEF2F7;
  --tb-switch-track-off: #CBD5E1;

  /* Menu Pill Tokens */
  --tb-menu-active-bg: var(--tb-bg-surface);
  --tb-menu-active-color: var(--tb-primary);

  /* Typography Colors */
  --tb-text-title: #0F172A;
  --tb-text-body: #334155;
  --tb-text-muted: #64748B;
  --tb-text-subtle: #94A3B8;
  --tb-text-inverse: #FFFFFF;

  /* Borders & Dividers */
  --tb-border: #E2E8F0;
  --tb-border-subtle: #EDF2F7;
  --tb-border-focus: #0072DE;

  /* Squircles & Geometric Radii */
  --tb-radius-xs: 8px;
  --tb-radius-sm: 12px;
  --tb-radius-md: 18px;
  --tb-radius-card: 22px;
  --tb-radius-icon: 16px;
  --tb-radius-lg: 24px;
  --tb-radius-xl: 30px;
  --tb-radius-full: 9999px;

  /* Shadows - Ambient & Natural (No glowing, no multi-color) */
  --tb-shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --tb-shadow-card: 0 4px 16px -2px rgba(15, 23, 42, 0.04), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
  --tb-shadow-elevated: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
  --tb-shadow-dropdown: 0 12px 32px rgba(15, 23, 42, 0.12);

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

  /* Springs & Transitions */
  --tb-transition: 0.18s cubic-bezier(0.2, 0.8, 0.2, 1);
}

[data-theme="dark"] {
  --tb-bg-canvas: #0E1015;
  --tb-bg-surface: #181B22;
  --tb-bg-card: var(--tb-bg-surface);
  --tb-bg-subtle: #212530;
  --tb-bg-hover: #292E3C;
  --tb-bg-inset: #13151B;
  --tb-switch-track-off: #2A2F3D;

  --tb-menu-active-bg: #2D3342;
  --tb-menu-active-color: #38BDF8;

  --tb-text-title: #F8FAFC;
  --tb-text-body: #CBD5E1;
  --tb-text-muted: #94A3B8;
  --tb-text-subtle: #64748B;
  --tb-text-inverse: #0E1015;

  --tb-border: #282D3B;
  --tb-border-subtle: #1F232E;
  --tb-border-focus: #38BDF8;

  --tb-primary-subtle: rgba(0, 114, 222, 0.18);
  --tb-primary-border: rgba(0, 114, 222, 0.4);

  /* Dark-Mode High-Contrast Functional Tokens */
  --tb-green: #34D399;
  --tb-amber: #FBBF24;
  --tb-red: #F87171;
  --tb-purple: #C084FC;
  --tb-accent-green: var(--tb-green);

  --tb-green-subtle: rgba(52, 211, 153, 0.16);
  --tb-amber-subtle: rgba(251, 191, 36, 0.16);
  --tb-red-subtle: rgba(248, 113, 113, 0.18);
  --tb-purple-subtle: rgba(192, 132, 252, 0.16);

  --tb-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --tb-shadow-card: 0 4px 16px -2px rgba(0, 0, 0, 0.4), 0 2px 6px -1px rgba(0, 0, 0, 0.25);
  --tb-shadow-elevated: 0 12px 32px rgba(0, 0, 0, 0.5);
  --tb-shadow-dropdown: 0 16px 40px rgba(0, 0, 0, 0.6);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--tb-font);
  background-color: var(--tb-bg-canvas);
  color: var(--tb-text-body);
  line-height: 1.5;
  letter-spacing: -0.015em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--tb-primary);
  text-decoration: none;
  transition: opacity var(--tb-transition);
}

a:hover {
  opacity: 0.85;
}

/* Layout Containers */
.tb-container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.tb-container-narrow {
  max-width: 720px;
}

/* Top One UI Header Bar */
.tb-navbar {
  background-color: var(--tb-bg-surface);
  background-color: color-mix(in srgb, var(--tb-bg-surface) 90%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--tb-border);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 12px 0;
  transition: background-color var(--tb-transition), border-color var(--tb-transition);
}

.tb-nav-row,
.tb-nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.tb-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--tb-text-title);
  letter-spacing: -0.025em;
}

.tb-brand-icon {
  width: 38px;
  height: 38px;
  background-color: var(--tb-primary);
  color: #FFFFFF;
  border-radius: var(--tb-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.15rem;
  box-shadow: 0 2px 8px rgba(0, 114, 222, 0.28);
  flex-shrink: 0;
}

/* Samsung One UI Segmented Menu Pills */
.tb-menu-pills {
  display: inline-flex;
  align-items: center;
  background-color: var(--tb-bg-subtle);
  border: 1px solid var(--tb-border);
  border-radius: var(--tb-radius-full);
  padding: 4px;
  gap: 4px;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.tb-menu-pills::-webkit-scrollbar {
  display: none;
}

.tb-menu-item {
  padding: 8px 18px;
  border-radius: var(--tb-radius-full);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--tb-text-muted);
  cursor: pointer;
  border: none;
  background: transparent;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--tb-transition);
  user-select: none;
  white-space: nowrap;
  flex-shrink: 0;
  outline: none;
}

.tb-menu-item:hover {
  color: var(--tb-text-title);
}

.tb-menu-item:active {
  transform: scale(0.96);
}

.tb-menu-item.active {
  background-color: var(--tb-menu-active-bg);
  color: var(--tb-menu-active-color);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .tb-menu-item.active {
  background-color: var(--tb-menu-active-bg);
  color: var(--tb-menu-active-color);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

/* Samsung One UI Spacious Reachability Header */
.tb-samsung-header {
  padding: 40px 0 24px 0;
  margin-bottom: 8px;
}

.tb-header-kicker {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tb-primary);
  margin-bottom: 6px;
  display: inline-block;
}

.tb-header-title {
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--tb-text-title);
  line-height: 1.15;
}

.tb-header-subtitle {
  font-size: clamp(0.9rem, 1.8vw, 1.05rem);
  color: var(--tb-text-muted);
  margin-top: 6px;
  line-height: 1.45;
  max-width: 680px;
}

/* One UI Inset Grouped Card Container */
.tb-card {
  background-color: var(--tb-bg-surface);
  border: 1px solid var(--tb-border-subtle);
  border-radius: var(--tb-radius-card);
  padding: 24px;
  margin-bottom: 18px;
  box-shadow: var(--tb-shadow-card);
  transition: background-color var(--tb-transition), border-color var(--tb-transition), box-shadow var(--tb-transition);
}

.tb-card-inset {
  background-color: var(--tb-bg-subtle);
  border: 1px solid var(--tb-border-subtle);
  border-radius: var(--tb-radius-md);
  padding: 18px 20px;
  margin-bottom: 16px;
  transition: background-color var(--tb-transition), border-color var(--tb-transition);
}

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

.tb-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--tb-text-title);
  letter-spacing: -0.02em;
}

/* Samsung Inset List Rows */
.tb-list-group {
  display: flex;
  flex-direction: column;
}

.tb-list-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--tb-border-subtle);
}

.tb-list-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.tb-list-row:first-child {
  padding-top: 0;
}

/* App Grid (One UI Home / App Drawer Style) */
.tb-app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 16px;
}

.tb-app-item {
  background-color: var(--tb-bg-surface);
  border: 1px solid var(--tb-border-subtle);
  border-radius: var(--tb-radius-card);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 4px 16px -2px rgba(15, 23, 42, 0.04), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
  transition: transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.2s ease, border-color 0.2s ease;
}

.tb-app-item:hover {
  border-color: var(--tb-primary-border);
  transform: translateY(-2px);
  box-shadow: var(--tb-shadow-elevated);
}

.tb-app-item:active {
  transform: scale(0.98);
}

.tb-app-top {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 12px;
}

.tb-app-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--tb-radius-icon);
  background-color: var(--tb-bg-subtle);
  border: 1px solid var(--tb-border-subtle);
  object-fit: cover;
  flex-shrink: 0;
}

.tb-app-info {
  flex-grow: 1;
}

.tb-app-info h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--tb-text-title);
  letter-spacing: -0.02em;
  margin-bottom: 2px;
}

.tb-app-desc {
  font-size: 0.85rem;
  color: var(--tb-text-muted);
  line-height: 1.45;
  margin-bottom: 16px;
  flex-grow: 1;
}

/* Buttons (Samsung Tactile Pill) */
.tb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--tb-radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--tb-transition);
  user-select: none;
  white-space: nowrap;
  outline: none;
}

.tb-btn:active {
  transform: scale(0.965);
}

.tb-btn-primary {
  background-color: var(--tb-primary);
  color: #FFFFFF;
}

.tb-btn-primary:hover {
  background-color: var(--tb-primary-hover);
}

.tb-btn-secondary {
  background-color: var(--tb-bg-subtle);
  color: var(--tb-text-title);
  border-color: var(--tb-border);
}

.tb-btn-secondary:hover {
  background-color: var(--tb-bg-hover);
}

.tb-btn-danger {
  background-color: var(--tb-red-subtle);
  color: var(--tb-red);
}

.tb-btn-danger:hover {
  background-color: rgba(248, 113, 113, 0.22);
  color: var(--tb-red);
}

.tb-btn-tonal {
  background-color: var(--tb-primary-subtle);
  color: var(--tb-primary);
  border: 1px solid var(--tb-primary-border);
}

.tb-btn-tonal:hover {
  background-color: color-mix(in srgb, var(--tb-primary) 22%, transparent);
}

.tb-btn-ghost {
  background: transparent;
  color: var(--tb-text-muted);
}

.tb-btn-ghost:hover {
  background-color: var(--tb-bg-subtle);
  color: var(--tb-text-title);
}

.tb-btn-lg {
  padding: 12px 24px;
  font-size: 1rem;
}

.tb-btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}

.tb-btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: var(--tb-radius-full);
}

/* Samsung One UI Search Bar Pill */
.tb-search-wrapper {
  position: relative;
  width: 100%;
  max-width: 280px;
  display: flex;
  align-items: center;
}

.tb-search-icon {
  position: absolute;
  left: 14px;
  color: var(--tb-text-muted);
  pointer-events: none;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--tb-transition);
}

.tb-search-input {
  width: 100%;
  padding: 10px 18px 10px 38px;
  border-radius: var(--tb-radius-full);
  background-color: var(--tb-bg-subtle);
  border: 1px solid var(--tb-border);
  color: var(--tb-text-title);
  font-size: 0.885rem;
  font-family: inherit;
  outline: none;
  transition: all var(--tb-transition);
}

.tb-search-input:focus {
  background-color: var(--tb-bg-surface);
  border-color: var(--tb-primary);
  box-shadow: 0 0 0 3px var(--tb-primary-subtle);
}

.tb-search-wrapper:focus-within .tb-search-icon {
  color: var(--tb-primary);
}

/* Badges */
.tb-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  font-size: 0.725rem;
  font-weight: 600;
  border-radius: var(--tb-radius-full);
  letter-spacing: 0.02em;
}

.tb-badge-primary {
  background-color: var(--tb-primary-subtle);
  color: var(--tb-primary);
}

.tb-badge-success {
  background-color: var(--tb-green-subtle);
  color: var(--tb-green);
}

.tb-badge-warning {
  background-color: var(--tb-amber-subtle);
  color: var(--tb-amber);
}

.tb-badge-danger {
  background-color: var(--tb-red-subtle);
  color: var(--tb-red);
}

.tb-badge-neutral {
  background-color: var(--tb-bg-subtle);
  color: var(--tb-text-muted);
  border: 1px solid var(--tb-border);
}

/* Form Controls */
.tb-form-group {
  margin-bottom: 16px;
}

.tb-label {
  display: block;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--tb-text-muted);
  margin-bottom: 6px;
}

.tb-input, .tb-select, .tb-textarea {
  width: 100%;
  padding: 11px 16px;
  font-family: inherit;
  font-size: 0.9rem;
  background-color: var(--tb-bg-subtle);
  color: var(--tb-text-title);
  border: 1px solid var(--tb-border);
  border-radius: var(--tb-radius-sm);
  outline: none;
  transition: all var(--tb-transition);
}

.tb-input:focus, .tb-select:focus, .tb-textarea:focus {
  background-color: var(--tb-bg-surface);
  border-color: var(--tb-primary);
  box-shadow: 0 0 0 3px var(--tb-primary-subtle);
}

.tb-textarea {
  min-height: 100px;
  resize: vertical;
}

/* Samsung One UI Switch */
.tb-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
  gap: 10px;
}

.tb-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.tb-switch-track {
  width: 46px;
  height: 26px;
  background-color: var(--tb-switch-track-off);
  border-radius: var(--tb-radius-full);
  position: relative;
  transition: background-color 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.tb-switch-thumb {
  width: 20px;
  height: 20px;
  background-color: #FFFFFF;
  border-radius: 50%;
  position: absolute;
  top: 3px;
  left: 3px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.tb-switch input:checked + .tb-switch-track {
  background-color: var(--tb-primary);
}

.tb-switch input:checked + .tb-switch-track .tb-switch-thumb {
  transform: translateX(20px);
}

/* Stat Widgets */
.tb-stat-tile {
  background-color: var(--tb-bg-surface);
  border: 1px solid var(--tb-border-subtle);
  border-radius: var(--tb-radius-card);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--tb-shadow-sm);
  transition: all var(--tb-transition);
}

.tb-stat-tile:hover {
  border-color: var(--tb-primary-border);
  transform: translateY(-2px);
}

.tb-stat-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--tb-radius-sm);
  background-color: var(--tb-primary-subtle);
  color: var(--tb-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
}

.tb-stat-tile-blue .tb-stat-icon { background-color: var(--tb-primary-subtle); color: var(--tb-primary); }
.tb-stat-tile-green .tb-stat-icon { background-color: var(--tb-green-subtle); color: var(--tb-green); }
.tb-stat-tile-amber .tb-stat-icon { background-color: var(--tb-amber-subtle); color: var(--tb-amber); }
.tb-stat-tile-purple .tb-stat-icon { background-color: var(--tb-purple-subtle); color: var(--tb-purple); }

.tb-stat-val {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--tb-text-title);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.tb-stat-lbl {
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--tb-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

/* Tables */
.tb-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--tb-radius-md);
  border: 1px solid var(--tb-border);
  background-color: var(--tb-bg-surface);
}

.tb-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  text-align: left;
}

.tb-table th {
  background-color: var(--tb-bg-subtle);
  color: var(--tb-text-muted);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 12px 18px;
  border-bottom: 1px solid var(--tb-border);
}

.tb-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--tb-border-subtle);
  color: var(--tb-text-body);
  vertical-align: middle;
}

.tb-table tr:last-child td {
  border-bottom: none;
}

.tb-table tr:hover td {
  background-color: var(--tb-bg-subtle);
}

/* Modals */
.tb-modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--tb-transition);
}

.tb-modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.tb-modal {
  background-color: var(--tb-bg-surface);
  border: 1px solid var(--tb-border-subtle);
  border-radius: var(--tb-radius-lg);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--tb-shadow-elevated);
  padding: 28px;
  transform: translateY(14px) scale(0.98);
  transition: transform var(--tb-transition);
}

.tb-modal-backdrop.active .tb-modal {
  transform: translateY(0) scale(1);
}

.tb-modal-handle {
  display: none;
}

.tb-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.tb-modal-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--tb-text-title);
  letter-spacing: -0.02em;
}

/* Toast (Samsung One UI Bottom Center Pill) */
.tb-toast-container {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  pointer-events: none;
}

.tb-toast {
  background-color: var(--tb-text-title);
  color: var(--tb-bg-surface);
  border-radius: var(--tb-radius-full);
  padding: 11px 22px;
  font-size: 0.885rem;
  font-weight: 600;
  box-shadow: var(--tb-shadow-dropdown);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: tb-toast-pop 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
  pointer-events: auto;
}

@keyframes tb-toast-pop {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Code Blocks & Copy Action */
.tb-code-block {
  background-color: var(--tb-bg-subtle);
  border: 1px solid var(--tb-border);
  border-radius: var(--tb-radius-md);
  margin: 14px 0 20px 0;
  overflow: hidden;
}

.tb-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background-color: var(--tb-bg-surface);
  border-bottom: 1px solid var(--tb-border-subtle);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--tb-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tb-code-block pre,
pre.docs-code {
  background-color: var(--tb-bg-subtle);
  border-radius: var(--tb-radius-md);
  padding: 16px 18px;
  font-family: var(--tb-font-mono);
  font-size: 0.825rem;
  overflow-x: auto;
  color: var(--tb-text-title);
  line-height: 1.55;
  margin: 0;
}

/* Documentation Navigation */
.docs-nav {
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.docs-nav a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--tb-radius-sm);
  color: var(--tb-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--tb-transition);
}

.docs-nav a:hover,
.docs-nav a.active {
  background-color: var(--tb-bg-subtle);
  color: var(--tb-primary);
}

/* ================================================= */
/* RESPONSIVE VIEWPORT OPTIMIZATION                  */
/* ================================================= */

/* Desktop (>1024px) */
@media (min-width: 1025px) {
  .tb-app-grid {
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 18px;
  }
}

/* Tablet (600px - 1024px) */
@media (min-width: 600px) and (max-width: 1024.98px) {
  .tb-app-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

/* Small Screens & Mobile (<= 768px) */
@media (max-width: 768px) {
  .tb-nav-row,
  .tb-nav-wrapper {
    flex-wrap: wrap;
    gap: 12px;
  }

  .tb-menu-pills {
    order: 3;
    width: 100%;
    justify-content: flex-start;
  }

  /* Prevent iOS Safari auto-zoom on input tap */
  .tb-input,
  .tb-select,
  .tb-textarea,
  .tb-search-input {
    font-size: 16px !important;
  }

  /* Touch targets minimum comfortable height */
  .tb-btn {
    min-height: 40px;
  }

  .tb-btn-icon {
    min-width: 40px;
    min-height: 40px;
  }
}

/* Mobile Bottom-Sheet & Viewport Constraints (< 640px) */
@media (max-width: 639.98px) {
  .tb-container {
    padding: 0 16px;
  }

  .tb-app-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .tb-search-wrapper {
    max-width: 100%;
  }

  /* One UI Bottom-Sheet Modal */
  .tb-modal-backdrop {
    align-items: flex-end;
    padding: 0;
  }

  .tb-modal {
    border-radius: 28px 28px 0 0;
    max-height: 85vh;
    width: 100%;
    max-width: 100%;
    padding: 16px 20px 28px 20px;
    border-bottom: none;
    border-left: none;
    border-right: none;
    transform: translateY(100%);
    transition: transform 0.28s cubic-bezier(0.32, 0.72, 0, 1);
  }

  .tb-modal-backdrop.active .tb-modal {
    transform: translateY(0);
  }

  .tb-modal-handle {
    display: block;
    width: 42px;
    height: 5px;
    background-color: var(--tb-border);
    border-radius: var(--tb-radius-full);
    margin: 0 auto 16px auto;
    flex-shrink: 0;
  }
}

/* ==========================================================================
   TURBAY MAIL (R2) — 3-Pane Samsung One UI Layout
   ========================================================================== */
.tb-mail-container {
  display: flex;
  height: calc(100vh - 84px);
  min-height: 600px;
  background-color: var(--tb-bg-surface);
  border-radius: var(--tb-radius-card);
  border: 1px solid var(--tb-border);
  box-shadow: var(--tb-shadow-card);
  overflow: hidden;
}

.tb-mail-sidebar {
  width: 260px;
  flex-shrink: 0;
  background-color: var(--tb-bg-subtle);
  border-right: 1px solid var(--tb-border);
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 12px;
}

.tb-mail-nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  overflow-y: auto;
}

.tb-mail-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--tb-radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--tb-text-body);
  cursor: pointer;
  border: none;
  background: transparent;
  transition: background-color var(--tb-transition), color var(--tb-transition);
  text-align: left;
  width: 100%;
}

.tb-mail-nav-item:hover {
  background-color: var(--tb-bg-hover);
  color: var(--tb-text-title);
}

.tb-mail-nav-item.active {
  background-color: var(--tb-primary-subtle);
  color: var(--tb-primary);
}

.tb-mail-list-pane {
  width: 380px;
  flex-shrink: 0;
  border-right: 1px solid var(--tb-border);
  display: flex;
  flex-direction: column;
  background-color: var(--tb-bg-surface);
}

.tb-mail-list-header {
  padding: 16px 18px 12px 18px;
  border-bottom: 1px solid var(--tb-border);
  background-color: var(--tb-bg-surface);
}

.tb-mail-list-items {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tb-mail-item {
  padding: 12px 14px;
  border-radius: var(--tb-radius-md);
  cursor: pointer;
  transition: background-color var(--tb-transition), transform var(--tb-transition);
  border: 1px solid transparent;
  background-color: var(--tb-bg-card);
  position: relative;
}

.tb-mail-item:hover {
  background-color: var(--tb-bg-hover);
}

.tb-mail-item.selected {
  background-color: var(--tb-primary-subtle);
  border-color: var(--tb-primary-border);
}

.tb-mail-item.unread .tb-mail-item-title {
  font-weight: 700;
  color: var(--tb-text-title);
}

.tb-mail-unread-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--tb-primary);
  display: inline-block;
  margin-right: 6px;
}

.tb-mail-detail-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--tb-bg-surface);
  overflow-y: auto;
}

.tb-mail-detail-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--tb-text-muted);
  font-size: 0.95rem;
  gap: 12px;
}

.tb-mail-detail-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--tb-border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tb-mail-detail-body {
  padding: 24px;
  flex: 1;
  line-height: 1.7;
  color: var(--tb-text-body);
  font-size: 0.95rem;
}

/* ==========================================================================
   TURBAY CALENDAR (R3) — Multi-View Calendar Layout
   ========================================================================== */
.tb-calendar-container {
  display: flex;
  flex-direction: column;
  background-color: var(--tb-bg-surface);
  border-radius: var(--tb-radius-card);
  border: 1px solid var(--tb-border);
  box-shadow: var(--tb-shadow-card);
  padding: 20px;
  gap: 16px;
}

.tb-calendar-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.tb-calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
}

.tb-calendar-day-header {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--tb-text-muted);
  text-transform: uppercase;
  padding: 8px 0;
  letter-spacing: 0.05em;
}

.tb-calendar-cell {
  min-height: 96px;
  background-color: var(--tb-bg-subtle);
  border-radius: var(--tb-radius-md);
  border: 1px solid var(--tb-border-subtle);
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  transition: background-color var(--tb-transition), border-color var(--tb-transition);
}

.tb-calendar-cell:hover {
  background-color: var(--tb-bg-hover);
  border-color: var(--tb-border);
}

.tb-calendar-cell.other-month {
  opacity: 0.38;
}

.tb-calendar-cell.today {
  border-color: var(--tb-primary);
  background-color: var(--tb-primary-subtle);
}

.tb-calendar-day-num {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--tb-text-title);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.tb-calendar-cell.today .tb-calendar-day-num {
  background-color: var(--tb-primary);
  color: #FFFFFF;
}

.tb-calendar-event-pill {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--tb-radius-xs);
  color: #FFFFFF;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  transition: opacity var(--tb-transition);
}

.tb-calendar-event-pill:hover {
  opacity: 0.85;
}

.tb-calendar-week-grid {
  display: grid;
  grid-template-columns: 60px repeat(7, 1fr);
  gap: 1px;
  background-color: var(--tb-border);
  border-radius: var(--tb-radius-md);
  overflow: hidden;
}

.tb-calendar-week-timecol {
  background-color: var(--tb-bg-subtle);
  font-size: 0.72rem;
  color: var(--tb-text-muted);
  text-align: right;
  padding: 8px 6px;
}

.tb-calendar-week-daycol {
  background-color: var(--tb-bg-surface);
  min-height: 48px;
  padding: 4px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

/* ==========================================================================
   TURBAY TASKS (R4) — Interactive Dual Views & Kanban Board
   ========================================================================== */
.tb-tasks-stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.tb-stat-tile {
  background-color: var(--tb-bg-surface);
  border: 1px solid var(--tb-border);
  border-radius: var(--tb-radius-card);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--tb-shadow-sm);
}

.tb-stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1;
  color: var(--tb-text-title);
}

.tb-stat-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--tb-text-muted);
  margin-top: 4px;
}

/* Task List View */
.tb-task-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tb-task-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background-color: var(--tb-bg-surface);
  border: 1px solid var(--tb-border);
  border-radius: var(--tb-radius-md);
  box-shadow: var(--tb-shadow-sm);
  transition: transform var(--tb-transition), border-color var(--tb-transition), background-color var(--tb-transition);
}

.tb-task-row:hover {
  border-color: var(--tb-border-focus);
  background-color: var(--tb-bg-subtle);
}

.tb-task-row.completed {
  opacity: 0.65;
  background-color: var(--tb-bg-inset);
}

.tb-task-row.completed .tb-task-title {
  text-decoration: line-through;
  color: var(--tb-text-muted);
}

.tb-task-checkbox {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--tb-border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--tb-transition);
  background-color: var(--tb-bg-surface);
}

.tb-task-checkbox.checked {
  background-color: var(--tb-green);
  border-color: var(--tb-green);
  color: #FFFFFF;
}

/* Kanban Board View */
.tb-kanban-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  min-height: 550px;
  align-items: start;
}

.tb-kanban-col {
  background-color: var(--tb-bg-subtle);
  border-radius: var(--tb-radius-card);
  border: 1px solid var(--tb-border);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 480px;
}

.tb-kanban-col-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--tb-border);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--tb-text-title);
}

.tb-kanban-dropzone {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  min-height: 380px;
}

.tb-kanban-dropzone.drag-over {
  background-color: var(--tb-primary-subtle);
  border: 2px dashed var(--tb-primary);
  border-radius: var(--tb-radius-md);
}

.tb-kanban-card {
  background-color: var(--tb-bg-surface);
  border: 1px solid var(--tb-border);
  border-radius: var(--tb-radius-md);
  padding: 14px;
  box-shadow: var(--tb-shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: grab;
  transition: transform var(--tb-transition), box-shadow var(--tb-transition);
}

.tb-kanban-card:hover {
  box-shadow: var(--tb-shadow-card);
  border-color: var(--tb-border-focus);
}

.tb-kanban-card.dragging {
  opacity: 0.4;
  cursor: grabbing;
}

/* Responsive adjustments for Mail, Calendar, Tasks */
@media (max-width: 960px) {
  .tb-mail-container {
    flex-direction: column;
    height: auto;
  }
  .tb-mail-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--tb-border);
  }
  .tb-mail-list-pane {
    width: 100%;
    border-right: none;
    max-height: 400px;
  }
  .tb-kanban-board {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .tb-kanban-board {
    grid-template-columns: 1fr;
  }
  .tb-calendar-cell {
    min-height: 64px;
  }
}