/* ==========================================================================
   Real Estate Photography Hub — Dashboard / App Stylesheet
   realestatephotographyhub.com
   Authenticated area: course dashboard, modules, lessons, tools, resources
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. Brand Variables (mirrors global.css)
   -------------------------------------------------------------------------- */
:root {
  /* Brand palette */
  --dark: #111111;
  --dark-secondary: #1A1A1A;
  --dark-tertiary: #222222;
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-lighter: #60a5fa;
  --primary-pale: rgba(37,99,235,0.15);
  --success: #10b981;
  --success-light: rgba(16,185,129,0.15);
  --success-dark: #059669;
  --warning: #f59e0b;
  --warning-light: rgba(245,158,11,0.15);
  --danger: #ef4444;
  --danger-light: rgba(239,68,68,0.15);

  /* Neutrals */
  --gray-50: #151515;
  --gray-100: #1A1A1A;
  --gray-200: rgba(255,255,255,0.06);
  --gray-300: rgba(255,255,255,0.1);
  --gray-400: #6b7280;
  --gray-500: #9CA3AF;
  --gray-600: #9CA3AF;
  --gray-700: #d1d5db;
  --gray-800: #e0e0e0;
  --gray-900: #ffffff;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-display: 'Oswald', sans-serif;

  /* Spacing */
  --sidebar-width: 260px;
  --header-height: 64px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 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, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 8px 10px -6px rgba(0, 0, 0, 0.06);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

/* Oswald display headings */
.page-title,
.module-card-title,
.module-header-title,
.lesson-header-title,
.overall-progress-title,
.account-section-title,
.tool-card-title,
.resource-card-name,
.welcome-banner-title,
.section-heading,
.empty-state-title {
  font-family: var(--font-display);
  text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   1. App Layout — Sidebar + Main Content
   -------------------------------------------------------------------------- */
.app-layout {
  display: flex;
  min-height: 100vh;
  background: #111111;
}

/* ----- Sidebar ----- */
.app-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  width: var(--sidebar-width);
  height: 100vh;
  background: #111111;
  color: #fff;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--dark-tertiary) transparent;
  transition: transform var(--transition-base);
}

.app-sidebar::-webkit-scrollbar {
  width: 5px;
}

.app-sidebar::-webkit-scrollbar-thumb {
  background: var(--dark-tertiary);
  border-radius: 4px;
}

/* Sidebar logo area */
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 22px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
}

.sidebar-logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.sidebar-logo span {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

/* Sidebar navigation */
.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-nav-label {
  display: block;
  padding: 10px 12px 6px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gray-400);
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-300);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.sidebar-nav a svg,
.sidebar-nav a .nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.sidebar-nav a:hover {
  background: var(--dark-secondary);
  color: #fff;
}

.sidebar-nav a:hover svg,
.sidebar-nav a:hover .nav-icon {
  opacity: 1;
}

.sidebar-nav a.active {
  background: var(--primary);
  color: #fff;
}

.sidebar-nav a.active svg,
.sidebar-nav a.active .nav-icon {
  opacity: 1;
}

.sidebar-nav a .nav-badge {
  margin-left: auto;
  padding: 2px 8px;
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--primary-light);
  color: #fff;
  border-radius: 999px;
}

.sidebar-nav a.active .nav-badge {
  background: rgba(255, 255, 255, 0.25);
}

/* Sidebar user section */
.sidebar-user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  border-top: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
  margin-top: auto;
}

.sidebar-user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--dark-tertiary);
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
}

.sidebar-user-name {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-email {
  display: block;
  font-size: 0.75rem;
  color: var(--gray-400);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-logout {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  color: var(--gray-400);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.sidebar-user-logout:hover {
  background: var(--dark-secondary);
  color: #fff;
}

/* ----- Main Content Area ----- */
.app-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-content {
  flex: 1;
  padding: 32px 36px 48px;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   2. App Header — Top Bar with Breadcrumbs + User Avatar Dropdown
   -------------------------------------------------------------------------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 36px;
  background: #1A1A1A;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  box-shadow: none;
}

/* Hamburger toggle (hidden on desktop) */
.app-header-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-right: 12px;
  background: transparent;
  border: none;
  color: var(--gray-700);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.app-header-toggle:hover {
  background: rgba(255,255,255,0.06);
}

.app-header-toggle svg {
  width: 24px;
  height: 24px;
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--gray-500);
}

.breadcrumbs a {
  color: var(--gray-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--primary);
}

.breadcrumbs .breadcrumb-separator {
  color: #4b5563;
  user-select: none;
}

.breadcrumbs .breadcrumb-current {
  color: #ffffff;
  font-weight: 600;
}

/* Header right section */
.app-header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* User avatar dropdown */
.user-dropdown {
  position: relative;
}

.user-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px 6px 6px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.user-dropdown-trigger:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
}

.user-dropdown-trigger img {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
}

.user-dropdown-trigger .user-dropdown-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: #e0e0e0;
}

.user-dropdown-trigger .user-dropdown-chevron {
  width: 16px;
  height: 16px;
  color: var(--gray-400);
  transition: transform var(--transition-fast);
}

.user-dropdown.open .user-dropdown-chevron {
  transform: rotate(180deg);
}

.user-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 200;
  min-width: 200px;
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast),
    visibility var(--transition-fast);
}

.user-dropdown.open .user-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-dropdown-menu a,
.user-dropdown-menu button {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 16px;
  font-size: 0.85rem;
  color: var(--gray-700);
  text-decoration: none;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast);
  text-align: left;
}

.user-dropdown-menu a:first-child,
.user-dropdown-menu button:first-child {
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.user-dropdown-menu a:last-child,
.user-dropdown-menu button:last-child {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.user-dropdown-menu a:hover,
.user-dropdown-menu button:hover {
  background: rgba(255,255,255,0.06);
}

.user-dropdown-menu svg {
  width: 18px;
  height: 18px;
  color: var(--gray-400);
  flex-shrink: 0;
}

.user-dropdown-divider {
  height: 1px;
  margin: 4px 0;
  background: rgba(255,255,255,0.06);
}

/* --------------------------------------------------------------------------
   3. Dashboard Grid — Module Cards in Responsive Grid
   -------------------------------------------------------------------------- */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

/* --------------------------------------------------------------------------
   4. Module Card
   -------------------------------------------------------------------------- */
.module-card {
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: box-shadow var(--transition-base), transform var(--transition-base),
    border-color var(--transition-base);
}

.module-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: rgba(255,255,255,0.12);
}

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

.module-card-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--primary-pale);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.module-card-number.completed {
  background: var(--success-light);
  color: var(--success-dark);
}

.module-card-status {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.module-card-status.not-started {
  background: var(--gray-100);
  color: var(--gray-500);
}

.module-card-status.in-progress {
  background: var(--primary-pale);
  color: var(--primary);
}

.module-card-status.completed {
  background: var(--success-light);
  color: var(--success-dark);
}

.module-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.35;
  margin: 0;
}

.module-card-description {
  font-size: 0.875rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.module-card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--gray-400);
}

.module-card-meta svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.module-card-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* Module card progress bar */
.module-card-progress {
  margin-top: auto;
  padding-top: 8px;
}

.progress-bar-track {
  width: 100%;
  height: 6px;
  background: rgba(255,255,255,0.1);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary-light);
  border-radius: 999px;
  transition: width var(--transition-slow);
}

.progress-bar-fill.complete {
  background: var(--success);
}

.module-card-progress-text {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--gray-500);
}

.module-card-continue {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  margin-top: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.module-card-continue:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
}

.module-card-continue svg {
  width: 16px;
  height: 16px;
}

/* --------------------------------------------------------------------------
   5. Overall Progress Section
   -------------------------------------------------------------------------- */
.overall-progress {
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 32px;
}

.overall-progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.overall-progress-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin: 0;
}

.overall-progress-count {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray-500);
}

.overall-progress-count strong {
  color: var(--primary);
}

.overall-progress .progress-bar-track {
  height: 12px;
  border-radius: 999px;
}

.overall-progress .progress-bar-fill {
  border-radius: 999px;
}

.overall-progress-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.overall-progress-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.overall-progress-stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
}

.overall-progress-stat-label {
  font-size: 0.75rem;
  color: var(--gray-500);
}

/* --------------------------------------------------------------------------
   6. Module Detail Page
   -------------------------------------------------------------------------- */

/* Module header */
.module-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.module-header-top {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.module-header-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 14px;
  background: var(--primary-pale);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.module-header-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--gray-900);
  margin: 0;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.module-header-description {
  font-size: 1rem;
  color: var(--gray-500);
  line-height: 1.65;
  margin: 0;
  max-width: 720px;
}

.module-header-progress {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
}

.module-header-progress .progress-bar-track {
  flex: 1;
  max-width: 320px;
  height: 8px;
}

.module-header-progress-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-500);
  white-space: nowrap;
}

/* Lesson list */
.lesson-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  text-decoration: none;
  color: var(--gray-800);
  background: #1A1A1A;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition-fast);
  cursor: pointer;
}

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

.lesson-item:hover {
  background: #222222;
}

.lesson-item-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: rgba(255,255,255,0.06);
  color: var(--gray-500);
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
}

.lesson-item-status {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
}

.lesson-item-status.pending {
  border: 2px solid var(--gray-300);
  color: transparent;
}

.lesson-item-status.in-progress {
  border: 2px solid var(--primary-light);
  background: var(--primary-pale);
  color: var(--primary);
}

.lesson-item-status.complete {
  background: var(--success);
  color: #fff;
}

.lesson-item-status svg {
  width: 16px;
  height: 16px;
}

.lesson-item-content {
  flex: 1;
  min-width: 0;
}

.lesson-item-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--gray-800);
  line-height: 1.4;
}

.lesson-item-subtitle {
  font-size: 0.8rem;
  color: var(--gray-400);
  margin-top: 2px;
}

.lesson-item-duration {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--gray-400);
  white-space: nowrap;
  flex-shrink: 0;
}

.lesson-item-chevron {
  width: 20px;
  height: 20px;
  color: var(--gray-300);
  flex-shrink: 0;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.lesson-item:hover .lesson-item-chevron {
  color: var(--gray-500);
  transform: translateX(2px);
}

/* Completed lesson */
.lesson-item.completed .lesson-item-title {
  color: var(--gray-400);
}

.lesson-item.completed .lesson-item-duration {
  color: var(--gray-300);
}

.lesson-item.completed .lesson-item-number {
  background: var(--success-light);
  color: var(--success-dark);
}

/* Current / active lesson */
.lesson-item.current {
  background: rgba(37,99,235,0.15);
  border-left: 3px solid var(--primary);
}

.lesson-item.current .lesson-item-title {
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   7. Lesson Viewer Page
   -------------------------------------------------------------------------- */

/* Lesson header */
.lesson-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}

.lesson-header-left {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.lesson-header-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0;
  letter-spacing: -0.01em;
}

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

.lesson-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--gray-600);
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast),
    color var(--transition-fast);
}

.lesson-nav-btn:hover {
  background: #222222;
  border-color: rgba(255,255,255,0.12);
  color: var(--gray-800);
}

.lesson-nav-btn:disabled,
.lesson-nav-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.lesson-nav-btn svg {
  width: 16px;
  height: 16px;
}

/* Lesson viewer layout */
.lesson-viewer-layout {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

/* PDF viewer */
.pdf-viewer {
  flex: 1;
  min-width: 0;
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.pdf-viewer iframe {
  display: block;
  width: 100%;
  min-height: 600px;
  height: 75vh;
  border: none;
}

.pdf-viewer-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  text-align: center;
  gap: 16px;
}

.pdf-viewer-fallback svg {
  width: 48px;
  height: 48px;
  color: var(--gray-300);
}

.pdf-viewer-fallback p {
  color: var(--gray-500);
  font-size: 0.95rem;
}

/* Lesson actions */
.lesson-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.lesson-actions .btn-mark-complete {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: var(--success);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.lesson-actions .btn-mark-complete:hover {
  background: var(--success-dark);
  transform: translateY(-1px);
}

.lesson-actions .btn-mark-complete.is-completed {
  background: var(--gray-300);
  color: var(--gray-600);
  cursor: default;
  pointer-events: none;
}

.lesson-actions .btn-mark-complete svg {
  width: 18px;
  height: 18px;
}

.lesson-actions .btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #e0e0e0;
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.lesson-actions .btn-download:hover {
  background: #222222;
  border-color: rgba(255,255,255,0.12);
}

.lesson-actions .btn-download svg {
  width: 18px;
  height: 18px;
}

/* Lesson sidebar — list of lessons in current module */
.lesson-sidebar {
  width: 280px;
  flex-shrink: 0;
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.lesson-sidebar-header {
  padding: 18px 20px;
  font-size: 0.85rem;
  font-weight: 700;
  color: #ffffff;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  background: #151515;
}

.lesson-sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 520px;
  overflow-y: auto;
}

.lesson-sidebar-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  font-size: 0.82rem;
  color: var(--gray-600);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  transition: background var(--transition-fast);
  cursor: pointer;
}

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

.lesson-sidebar-item:hover {
  background: rgba(255,255,255,0.04);
}

.lesson-sidebar-item.current {
  background: rgba(37,99,235,0.15);
  color: var(--primary);
  font-weight: 600;
  border-left: 3px solid var(--primary);
}

.lesson-sidebar-item.completed {
  color: var(--gray-400);
}

.lesson-sidebar-item .sidebar-lesson-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.lesson-sidebar-item.completed .sidebar-lesson-icon {
  color: var(--success);
}

.lesson-sidebar-item.current .sidebar-lesson-icon {
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   8. Tools Page
   -------------------------------------------------------------------------- */

/* Tool grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

/* Tool card */
.tool-card {
  position: relative;
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.tool-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(255,255,255,0.12);
}

.tool-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.tool-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  object-fit: contain;
  background: rgba(255,255,255,0.06);
  padding: 6px;
  flex-shrink: 0;
}

.tool-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin: 0;
}

.tool-card-description {
  font-size: 0.875rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin: 0;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 8px;
  gap: 12px;
}

.tool-card-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.tool-card-btn:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
}

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

/* Tool badge — "We Use This" */
.tool-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--success-dark);
  background: var(--success-light);
  border-radius: 999px;
  white-space: nowrap;
}

.tool-badge svg {
  width: 14px;
  height: 14px;
}

/* Badge positioned in top right of card */
.tool-card .tool-badge {
  position: absolute;
  top: 16px;
  right: 16px;
}

/* --------------------------------------------------------------------------
   9. Resources Page
   -------------------------------------------------------------------------- */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.resource-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.resource-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(255,255,255,0.12);
}

.resource-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--primary-pale);
  color: var(--primary);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.resource-card-icon svg {
  width: 24px;
  height: 24px;
}

.resource-card-icon.pdf {
  background: #fee2e2;
  color: var(--danger);
}

.resource-card-icon.zip {
  background: var(--warning-light);
  color: var(--warning);
}

.resource-card-icon.image {
  background: #ede9fe;
  color: #7c3aed;
}

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

.resource-card-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin: 0 0 4px;
}

.resource-card-description {
  font-size: 0.825rem;
  color: var(--gray-500);
  line-height: 1.55;
  margin: 0 0 14px;
}

.resource-card-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-pale);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.resource-card-download:hover {
  background: var(--primary);
  color: #fff;
}

.resource-card-download svg {
  width: 14px;
  height: 14px;
}

/* --------------------------------------------------------------------------
   10. Account Page
   -------------------------------------------------------------------------- */
.account-page {
  max-width: 720px;
}

.account-section {
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 24px;
}

.account-section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin: 0 0 6px;
}

.account-section-description {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin: 0 0 24px;
  line-height: 1.5;
}

.account-form-group {
  margin-bottom: 20px;
}

.account-form-group:last-child {
  margin-bottom: 0;
}

.account-form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: #9CA3AF;
  margin-bottom: 6px;
}

.account-form-input {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  color: #e0e0e0;
  background: #111111;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.account-form-input:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.account-form-input::placeholder {
  color: var(--gray-400);
}

.account-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.account-form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

.account-btn-save {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.account-btn-save:hover {
  background: var(--primary-light);
}

.account-btn-cancel {
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-500);
  background: transparent;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.account-btn-cancel:hover {
  background: var(--gray-50);
  color: var(--gray-700);
}

.account-danger-zone {
  border-color: var(--danger-light);
}

.account-danger-zone .account-section-title {
  color: var(--danger);
}

/* --------------------------------------------------------------------------
   11. Welcome Banner
   -------------------------------------------------------------------------- */
.welcome-banner {
  background: linear-gradient(135deg, var(--primary) 0%, #1d4ed8 100%);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  margin-bottom: 32px;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.welcome-banner::after {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 50%;
  pointer-events: none;
}

.welcome-banner-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.welcome-banner-subtitle {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.8);
  margin: 0;
  line-height: 1.6;
  max-width: 560px;
}

.welcome-banner-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 10px 22px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  background: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.welcome-banner-cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.welcome-banner-cta svg {
  width: 16px;
  height: 16px;
}

/* --------------------------------------------------------------------------
   12. Empty State
   -------------------------------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 24px;
  background: #1A1A1A;
  border: 2px dashed rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  color: var(--gray-300);
  margin-bottom: 20px;
}

.empty-state-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin: 0 0 8px;
}

.empty-state-description {
  font-size: 0.9rem;
  color: var(--gray-500);
  margin: 0 0 24px;
  max-width: 380px;
  line-height: 1.6;
}

.empty-state-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast);
}

.empty-state-action:hover {
  background: var(--primary-light);
}

/* --------------------------------------------------------------------------
   13. Page section title (reusable)
   -------------------------------------------------------------------------- */
.page-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
  margin: 0 0 4px;
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 0.95rem;
  color: var(--gray-500);
  margin: 0 0 28px;
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   14. Sidebar Overlay (mobile)
   -------------------------------------------------------------------------- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.sidebar-overlay.active {
  display: block;
  opacity: 1;
}

/* --------------------------------------------------------------------------
   15. Notifications / Toasts (utility)
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--gray-900);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  transform: translateY(100px);
  opacity: 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

.toast.success {
  background: var(--success-dark);
}

.toast.error {
  background: var(--danger);
}

.toast svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.toast-close {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 8px;
  width: 24px;
  height: 24px;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   16. Responsive — Tablet (max-width: 1024px)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .app-sidebar {
    width: 220px;
  }

  :root {
    --sidebar-width: 220px;
  }

  .app-content {
    padding: 24px 24px 40px;
  }

  .app-header {
    padding: 0 24px;
  }

  .dashboard-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
  }

  .tool-grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
  }

  .resource-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
  }

  .lesson-viewer-layout {
    flex-direction: column;
  }

  .lesson-sidebar {
    width: 100%;
    order: -1;
  }

  .lesson-sidebar-list {
    max-height: 200px;
  }

  .overall-progress-stats {
    gap: 24px;
  }

  .welcome-banner {
    padding: 24px 28px;
  }

  .welcome-banner-title {
    font-size: 1.3rem;
  }

  .account-form-row {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   17. Responsive — Mobile (max-width: 768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  /* Sidebar becomes slide-out hamburger menu */
  .app-sidebar {
    width: var(--sidebar-width, 280px);
    transform: translateX(-100%);
    box-shadow: none;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
  }

  .app-sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-xl);
  }

  .sidebar-overlay.active {
    display: block;
    opacity: 1;
  }

  /* Reset sidebar width for mobile */
  :root {
    --sidebar-width: 280px;
  }

  /* Show hamburger toggle */
  .app-header-toggle {
    display: flex;
  }

  /* Main content full width on mobile */
  .app-main {
    margin-left: 0;
  }

  .app-header {
    padding: 0 16px;
  }

  .app-content {
    padding: 20px 16px 36px;
  }

  /* Dashboard grid single column */
  .dashboard-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .tool-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .resource-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* Module header */
  .module-header-title {
    font-size: 1.35rem;
  }

  .module-header-progress {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .module-header-progress .progress-bar-track {
    max-width: 100%;
    width: 100%;
  }

  /* Lesson list */
  .lesson-item {
    padding: 14px 16px;
    gap: 12px;
  }

  .lesson-item-duration {
    display: none;
  }

  /* Lesson viewer */
  .lesson-viewer-layout {
    flex-direction: column;
  }

  .lesson-sidebar {
    width: 100%;
    order: -1;
  }

  .pdf-viewer iframe {
    min-height: 400px;
    height: 60vh;
  }

  .lesson-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .lesson-header-title {
    font-size: 1.15rem;
  }

  .lesson-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .lesson-actions .btn-mark-complete,
  .lesson-actions .btn-download {
    justify-content: center;
  }

  /* Overall progress */
  .overall-progress {
    padding: 20px;
  }

  .overall-progress-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .overall-progress-stats {
    flex-direction: column;
    gap: 12px;
  }

  .overall-progress-stat {
    flex-direction: row;
    align-items: center;
    gap: 8px;
  }

  /* Welcome banner */
  .welcome-banner {
    padding: 20px;
  }

  .welcome-banner-title {
    font-size: 1.15rem;
  }

  .welcome-banner-subtitle {
    font-size: 0.875rem;
  }

  /* Module card */
  .module-card {
    padding: 20px;
  }

  .module-card-title {
    font-size: 1.05rem;
  }

  /* Page titles */
  .page-title {
    font-size: 1.25rem;
  }

  /* Account page */
  .account-section {
    padding: 20px;
  }

  .account-form-row {
    grid-template-columns: 1fr;
  }

  /* Breadcrumbs: hide middle items on mobile */
  .breadcrumbs .breadcrumb-collapsible {
    display: none;
  }

  /* User dropdown: hide name on mobile */
  .user-dropdown-trigger .user-dropdown-name {
    display: none;
  }

  /* Tool card badge repositioning */
  .tool-card .tool-badge {
    position: static;
    align-self: flex-start;
  }

  /* Empty state */
  .empty-state {
    padding: 40px 20px;
  }

  /* Toast repositioning */
  .toast {
    left: 16px;
    right: 16px;
    bottom: 16px;
  }
}

/* --------------------------------------------------------------------------
   18. Small mobile (max-width: 480px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .app-content {
    padding: 16px 12px 32px;
  }

  .module-card-header {
    flex-direction: column;
    gap: 8px;
  }

  .lesson-header-nav {
    width: 100%;
  }

  .lesson-nav-btn {
    flex: 1;
    justify-content: center;
  }

  .welcome-banner-cta {
    width: 100%;
    justify-content: center;
  }

  .tool-card {
    padding: 20px;
  }

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

  .resource-card-icon {
    width: 40px;
    height: 40px;
  }
}

/* --------------------------------------------------------------------------
   19. Print styles
   -------------------------------------------------------------------------- */
@media print {
  .app-sidebar,
  .app-header,
  .app-header-toggle,
  .sidebar-overlay,
  .lesson-sidebar,
  .lesson-actions,
  .toast {
    display: none !important;
  }

  .app-main {
    margin-left: 0;
  }

  .app-content {
    padding: 0;
    max-width: none;
  }

  .module-card,
  .tool-card,
  .resource-card,
  .account-section,
  .overall-progress {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}

/* --------------------------------------------------------------------------
   20. Utility classes
   -------------------------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.text-danger {
  color: var(--danger) !important;
}

.text-muted {
  color: var(--gray-400) !important;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }

/* Focus visible for keyboard navigation */
.app-sidebar a:focus-visible,
.sidebar-nav a:focus-visible,
.lesson-item:focus-visible,
.lesson-sidebar-item:focus-visible,
.module-card-continue:focus-visible,
.tool-card-btn:focus-visible,
.resource-card-download:focus-visible,
.account-btn-save:focus-visible,
.lesson-nav-btn:focus-visible,
.user-dropdown-trigger:focus-visible,
.app-header-toggle:focus-visible,
.btn-mark-complete:focus-visible,
.btn-download:focus-visible {
  outline: 2px solid var(--primary-light);
  outline-offset: 2px;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------------------------
   21. Skeleton Loading
   -------------------------------------------------------------------------- */
.skeleton {
  background: linear-gradient(90deg, #1A1A1A 25%, #222222 50%, #1A1A1A 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 14px;
  margin-bottom: 8px;
  width: 80%;
}

.skeleton-text.short { width: 40%; }
.skeleton-text.medium { width: 60%; }

.skeleton-heading {
  height: 24px;
  width: 50%;
  margin-bottom: 12px;
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.skeleton-card {
  height: 200px;
  border-radius: var(--radius-lg);
}

.skeleton-bar {
  height: 8px;
  border-radius: 999px;
}

/* --------------------------------------------------------------------------
   22. Micro-Animations
   -------------------------------------------------------------------------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.4s ease-out both;
}

.animate-in-delay-1 { animation-delay: 0.05s; }
.animate-in-delay-2 { animation-delay: 0.1s; }
.animate-in-delay-3 { animation-delay: 0.15s; }
.animate-in-delay-4 { animation-delay: 0.2s; }
.animate-in-delay-5 { animation-delay: 0.25s; }
.animate-in-delay-6 { animation-delay: 0.3s; }

/* Staggered module card animation */
.module-card {
  opacity: 0;
  animation: fadeInUp 0.4s ease-out both;
}

.module-card:nth-child(1) { animation-delay: 0.05s; }
.module-card:nth-child(2) { animation-delay: 0.1s; }
.module-card:nth-child(3) { animation-delay: 0.15s; }
.module-card:nth-child(4) { animation-delay: 0.2s; }
.module-card:nth-child(5) { animation-delay: 0.25s; }
.module-card:nth-child(6) { animation-delay: 0.3s; }
.module-card:nth-child(7) { animation-delay: 0.35s; }
.module-card:nth-child(8) { animation-delay: 0.4s; }

/* Hover lift effect */
.hover-lift {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* Scale on press */
.press-scale:active {
  transform: scale(0.97);
}

/* Lesson item entrance */
.lesson-item {
  opacity: 0;
  animation: fadeInUp 0.3s ease-out both;
}

.lesson-item:nth-child(1) { animation-delay: 0.02s; }
.lesson-item:nth-child(2) { animation-delay: 0.04s; }
.lesson-item:nth-child(3) { animation-delay: 0.06s; }
.lesson-item:nth-child(4) { animation-delay: 0.08s; }
.lesson-item:nth-child(5) { animation-delay: 0.1s; }
.lesson-item:nth-child(6) { animation-delay: 0.12s; }
.lesson-item:nth-child(7) { animation-delay: 0.14s; }
.lesson-item:nth-child(8) { animation-delay: 0.16s; }
.lesson-item:nth-child(9) { animation-delay: 0.18s; }
.lesson-item:nth-child(10) { animation-delay: 0.2s; }

/* Welcome banner entrance */
.welcome-banner {
  opacity: 0;
  animation: fadeInUp 0.5s ease-out 0.1s both;
}

/* Overall progress entrance */
.overall-progress {
  opacity: 0;
  animation: fadeInUp 0.5s ease-out 0.15s both;
}

/* --------------------------------------------------------------------------
   23. Mobile Bottom Tab Navigation
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .mobile-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0 1rem;
    height: 56px;
    background: #111111;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    position: sticky;
    top: 0;
    z-index: 50;
  }

  .mobile-logo {
    font-family: 'Oswald', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    color: #ffffff;
  }

  .hamburger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    color: var(--gray-700);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
  }

  .hamburger:hover {
    background: var(--gray-100);
  }

  .sidebar-overlay.open {
    display: block;
    opacity: 1;
  }

  /* Larger tap targets */
  .sidebar-nav a {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  button, a.nav-link, .complete-btn, .download-btn,
  .module-btn, .resource-download-btn, .tool-link,
  .lesson-item {
    min-height: 44px;
  }
}

/* Hide mobile header on desktop */
@media (min-width: 769px) {
  .mobile-header {
    display: none;
  }

  .sidebar-overlay {
    display: none !important;
  }
}