/**
 * AITRAIN LMS - Professional Design System
 * A comprehensive, modern design system for the learning platform
 * Version: 2.0
 */

/* ============================================
   VARIABLE FONT DECLARATIONS
   Performance-optimized with single file for all weights
   ============================================ */

/* Fallback for older browsers that don't support variable fonts */
@supports not (font-variation-settings: normal) {
  @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
}

/* Variable Font: Inter (supports weights 100-900) */
@font-face {
  font-family: 'Inter';
  src: url('https://fonts.gstatic.com/s/inter/v13/UcC73FwrK3iLTcviYw.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Inter';
  src: url('https://fonts.gstatic.com/s/inter/v13/UcC73FwrK3iLTcviYwY.woff2') format('woff2');
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}

/* Variable Font: JetBrains Mono for code */
@font-face {
  font-family: 'JetBrains Mono';
  src: url('https://fonts.gstatic.com/s/jetbrainsmono/v18/tDbY2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKxjOVGa.woff2') format('woff2');
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */

:root {
  /* ===========================================
     STANDARDIZED COLOR SYSTEM
     Semantic naming convention for consistency
     =========================================== */

  /* Primary Brand Colors (Orange) */
  --color-primary-500: #F26522;
  --color-primary-400: #FF7A3D;
  --color-primary-600: #D55A1B;
  --color-primary-glow: rgba(242, 101, 34, 0.4);
  --color-primary-bg: rgba(242, 101, 34, 0.1);
  --color-primary-bg-subtle: rgba(242, 101, 34, 0.08);
  --color-primary-focus: 0 0 0 3px rgba(242, 101, 34, 0.15);
  --color-primary-focus-glow: 0 0 0 4px rgba(242, 101, 34, 0.25);

  /* Secondary Brand Colors (Navy) */
  --color-secondary-500: #1E3A5F;

  /* Gray/Neutral Colors */
  --color-gray-50: #F8FAFC;
  --color-gray-100: #F1F5F9;
  --color-gray-200: #E2E8F0;
  --color-gray-300: #CBD5E1;
  --color-gray-400: #94A3B8;
  --color-gray-500: #64748B;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1E293B;
  --color-gray-900: #0F172A;

  /* Success Colors (Green) */
  --color-success-500: #10B981;
  --color-success-400: #34D399;
  --color-success-600: #059669;
  --color-success-bg: rgba(16, 185, 129, 0.1);

  /* Warning Colors (Yellow/Amber) */
  --color-warning-500: #F59E0B;
  --color-warning-400: #FBBF24;
  --color-warning-600: #D97706;
  --color-warning-bg: rgba(245, 158, 11, 0.1);

  /* Error/Danger Colors (Red) */
  --color-error-500: #EF4444;
  --color-error-400: #F87171;
  --color-error-600: #DC2626;
  --color-error-bg: rgba(239, 68, 68, 0.1);

  /* Info Colors (Blue) */
  --color-info-500: #3B82F6;
  --color-info-400: #60A5FA;
  --color-info-600: #2563EB;
  --color-info-bg: rgba(59, 130, 246, 0.1);

  /* Additional Colors */
  --color-purple-500: #8B5CF6;
  --color-purple-bg: rgba(139, 92, 246, 0.1);

  /* Text Colors */
  --color-text-primary: #0F172A;
  --color-text-secondary: #475569;
  --color-text-tertiary: #64748B;
  --color-text-muted: #94A3B8;
  --color-text-inverse: #FFFFFF;
  --color-text-on-primary: #FFFFFF;

  /* Surface Colors */
  --color-surface-primary: #FFFFFF;
  --color-surface-secondary: #F8FAFC;
  --color-surface-overlay-dark: rgba(0, 0, 0, 0.5);
  --color-surface-overlay-darker: rgba(0, 0, 0, 0.8);

  /* Border Colors */
  --color-border-print: #ddd;

  /* Legacy Aliases (for backward compatibility) */
  --brand-primary: var(--color-primary-500);
  --brand-primary-dark: var(--color-primary-600);
  --brand-primary-light: var(--color-primary-400);
  --brand-secondary: var(--color-secondary-500);
  --brand-accent: var(--color-success-500);

  --color-success: var(--color-success-500);
  --color-warning: var(--color-warning-500);
  --color-error: var(--color-error-500);
  --color-info: var(--color-info-500);

  /* Level Colors */
  --color-explorer: var(--color-info-500);
  --color-builder: var(--color-success-500);
  --color-pro: var(--color-purple-500);

  /* ===========================================
     FLUID TYPOGRAPHY SCALE - Phase 13 (2026 Design)
     Uses CSS clamp() for smooth responsive scaling
     Scales between 320px and 1200px viewport width
     Minimum sizes ensure accessibility (never below 12px)
     =========================================== */
  /* Variable font settings */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family: var(--font-sans);
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;

  /* Font weight scale using variable font */
  --font-weight-thin: 100;
  --font-weight-extralight: 200;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;

  /* Optical sizing for better rendering at different sizes */
  --font-optical-sizing: auto;

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.8125rem, 0.75rem + 0.3125vw, 0.9375rem);
  --text-base: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --text-lg: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --text-xl: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --text-2xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-3xl: clamp(1.5rem, 1.25rem + 1.25vw, 1.875rem);
  --text-4xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.25rem);
  --text-5xl: clamp(2.25rem, 1.75rem + 2.5vw, 3rem);

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px var(--color-primary-glow, rgba(242, 101, 34, 0.3));

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-bounce: 300ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Z-Index Scale (unified across platform) */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal-backdrop: 300;
  --z-modal: 400;
  --z-popover: 500;
  --z-tooltip: 600;
  --z-toast: 700;
  --z-command: 800;
  --z-max: 9999;

  /* Layout */
  --sidebar-width: 260px;
  --sidebar-collapsed: 72px;
  --topbar-height: 64px;
  --content-max-width: 1400px;
}

/* ============================================
   LIGHT THEME (Default)
   ============================================ */

:root,
[data-theme="light"] {
  --bg-primary: var(--color-surface-primary);
  --bg-secondary: var(--color-gray-50);
  --bg-tertiary: var(--color-gray-100);
  --bg-hover: var(--color-gray-200);
  --bg-active: var(--color-gray-300);

  --text-primary: var(--color-text-primary);
  --text-secondary: var(--color-text-secondary);
  --text-tertiary: var(--color-text-tertiary);
  --text-muted: var(--color-text-muted);
  --text-inverse: var(--color-text-inverse);

  --border-light: var(--color-gray-200);
  --border-medium: var(--color-gray-300);
  --border-dark: var(--color-gray-400);

  --card-bg: var(--color-surface-primary);
  --card-border: var(--color-gray-200);
  --card-shadow: var(--shadow-md);

  --input-bg: var(--color-surface-primary);
  --input-border: var(--color-gray-300);
  --input-focus: var(--brand-primary);

  --sidebar-bg: var(--color-surface-primary);
  --sidebar-border: var(--color-gray-200);
  --sidebar-text: var(--color-text-secondary);
  --sidebar-active: var(--color-primary-bg);

  --topbar-bg: var(--color-surface-primary);
  --topbar-border: var(--color-gray-200);

  --code-bg: var(--color-gray-100);
}

/* ============================================
   DARK THEME
   ============================================ */

[data-theme="dark"] {
  --bg-primary: var(--color-gray-900);
  --bg-secondary: var(--color-gray-800);
  --bg-tertiary: var(--color-gray-700);
  --bg-hover: var(--color-gray-600);
  --bg-active: var(--color-gray-500);

  --text-primary: var(--color-gray-50);
  --text-secondary: var(--color-gray-300);
  --text-tertiary: var(--color-gray-400);
  --text-muted: var(--color-gray-500);
  --text-inverse: var(--color-gray-900);

  --border-light: var(--color-gray-700);
  --border-medium: var(--color-gray-600);
  --border-dark: var(--color-gray-500);

  --card-bg: var(--color-gray-800);
  --card-border: var(--color-gray-700);
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);

  --input-bg: var(--color-gray-800);
  --input-border: var(--color-gray-600);
  --input-focus: var(--brand-primary);

  --sidebar-bg: var(--color-gray-800);
  --sidebar-border: var(--color-gray-700);
  --sidebar-text: var(--color-gray-300);
  --sidebar-active: var(--color-primary-bg);

  --topbar-bg: var(--color-gray-800);
  --topbar-border: var(--color-gray-700);

  --code-bg: var(--color-gray-700);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

/* ============================================
   CSS RESET & BASE
   ============================================ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background: var(--bg-secondary);
  min-height: 100vh;
  /* Variable font features */
  font-optical-sizing: var(--font-optical-sizing);
  font-feature-settings: 'liga' 1, 'calt' 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   FLUID TYPOGRAPHY - Phase 13 (2026 Design Trends)
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
  /* Tighter tracking at larger sizes for better readability */
  letter-spacing: -0.02em;
}

h1, .h1 {
  font-size: var(--text-5xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.03em;
}

h2, .h2 {
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.025em;
}

h3, .h3 {
  font-size: var(--text-3xl);
  letter-spacing: -0.015em;
}

h4, .h4 {
  font-size: var(--text-2xl);
}

h5, .h5 {
  font-size: var(--text-xl);
}

h6, .h6 {
  font-size: var(--text-lg);
}

p {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

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

a:hover {
  color: var(--brand-primary-dark);
}

small {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

code, pre, .mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  /* Variable mono font features */
  font-feature-settings: 'liga' 1, 'calt' 1;
}

code {
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
}

pre {
  background: var(--code-bg);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
}

/* ============================================
   LAYOUT COMPONENTS
   ============================================ */

.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sticky);
  transition: width var(--transition-base), transform var(--transition-base);
}

.sidebar-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--sidebar-border);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.sidebar-logo {
  height: 32px;
  width: auto;
}

.sidebar-brand {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
}

.sidebar-brand span {
  color: var(--brand-primary);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) 0;
}

.nav-section {
  padding: var(--space-2) var(--space-4);
}

.nav-section-title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: var(--space-2) var(--space-4);
  margin-bottom: var(--space-1);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-1) var(--space-2);
  border-radius: var(--radius-lg);
  color: var(--sidebar-text);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: all var(--transition-fast);
  cursor: pointer;
}

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

.nav-item.active {
  background: var(--sidebar-active);
  color: var(--brand-primary);
}

.nav-item svg,
.nav-item i {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.nav-badge {
  margin-left: auto;
  background: var(--brand-primary);
  color: white;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

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

/* Topbar */
.topbar {
  position: sticky;
  top: 0;
  height: var(--topbar-height);
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--topbar-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  z-index: var(--z-sticky);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.topbar-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.topbar-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.topbar-breadcrumb a {
  color: var(--text-tertiary);
}

.topbar-breadcrumb a:hover {
  color: var(--brand-primary);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.topbar-search {
  position: relative;
}

.topbar-search input {
  width: 280px;
  padding: var(--space-2) var(--space-4);
  padding-left: 40px;
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.topbar-search input:focus {
  outline: none;
  background: var(--input-bg);
  border-color: var(--brand-primary);
  box-shadow: var(--color-primary-focus);
}

.topbar-search input:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
  background: var(--input-bg);
  border-color: var(--brand-primary);
  box-shadow: var(--color-primary-focus);
}

.topbar-search svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
}

/* Content Area */
.content {
  flex: 1;
  padding: var(--space-6);
  max-width: var(--content-max-width);
  margin: 0 auto;
  width: 100%;
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border-light);
  background: var(--bg-secondary);
}

/* Course Card */
.course-card {
  display: flex;
  flex-direction: column;
}

.course-card-image {
  position: relative;
  height: 160px;
  background: linear-gradient(135deg, var(--brand-secondary) 0%, var(--brand-primary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.course-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-card-badge {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  background: var(--color-explorer);
  color: white;
}

.course-card-badge.builder { background: var(--color-builder); }
.course-card-badge.pro { background: var(--color-pro); }

.course-card-content {
  padding: var(--space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.course-card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card-description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.course-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.course-card-meta svg {
  width: 16px;
  height: 16px;
}

.course-card-progress {
  margin-top: var(--space-4);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  line-height: 1;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--brand-primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--brand-primary-dark);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
}

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

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-success {
  background: var(--color-success);
  color: white;
}

.btn-danger {
  background: var(--color-error);
  color: white;
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-base);
}

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

.btn-icon {
  padding: var(--space-2);
  width: 40px;
  height: 40px;
}

.btn-icon.sm {
  width: 32px;
  height: 32px;
}

/* ============================================
   FORM ELEMENTS
   ============================================ */

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-lg);
  font-family: inherit;
  font-size: var(--text-base);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: var(--color-primary-focus);
}

.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
  border-color: var(--input-focus);
  box-shadow: var(--color-primary-focus);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-hint {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-top: var(--space-1);
}

.form-error {
  font-size: var(--text-sm);
  color: var(--color-error);
  margin-top: var(--space-1);
}

/* ============================================
   PROGRESS BARS
   ============================================ */

.progress {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--brand-primary) 0%, var(--brand-primary-light) 100%);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.progress-bar.success { background: var(--color-success); }
.progress-bar.warning { background: var(--color-warning); }

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
}

/* ============================================
   BADGES & TAGS
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-primary { background: var(--color-primary-bg); color: var(--brand-primary); }
.badge-success { background: var(--color-success-bg); color: var(--color-success); }
.badge-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-error { background: var(--color-error-bg); color: var(--color-error); }
.badge-info { background: var(--color-info-bg); color: var(--color-info); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

/* ============================================
   STATS CARDS
   ============================================ */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-5);
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  transition: all var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-glow);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-bg);
  color: var(--brand-primary);
  flex-shrink: 0;
}

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

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

.stat-value {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: var(--space-1);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.stat-change {
  font-size: var(--text-xs);
  margin-top: var(--space-1);
}

.stat-change.positive { color: var(--color-success); }
.stat-change.negative { color: var(--color-error); }

/* ============================================
   AVATAR & USER ELEMENTS
   ============================================ */

.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  overflow: hidden;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-sm { width: 32px; height: 32px; font-size: var(--text-xs); }
.avatar-lg { width: 56px; height: 56px; font-size: var(--text-lg); }
.avatar-xl { width: 80px; height: 80px; font-size: var(--text-2xl); }

.avatar-group {
  display: flex;
}

.avatar-group .avatar {
  border: 2px solid var(--bg-primary);
  margin-left: -8px;
}

.avatar-group .avatar:first-child {
  margin-left: 0;
}

.user-menu {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.user-menu:hover {
  background: var(--bg-hover);
}

.user-info {
  text-align: right;
}

.user-name {
  font-weight: var(--font-medium);
  color: var(--text-primary);
  font-size: var(--text-sm);
}

.user-role {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* ============================================
   NOTIFICATIONS & ALERTS
   ============================================ */

.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.alert-info {
  background: var(--color-info-bg);
  border: 1px solid var(--color-info);
  color: var(--color-info);
}

.alert-success {
  background: var(--color-success-bg);
  border: 1px solid var(--color-success);
  color: var(--color-success);
}

.alert-warning {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning);
  color: var(--color-warning);
}

.alert-error {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  color: var(--color-error);
}

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

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
}

.toast {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  padding: var(--space-4) var(--space-5);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  z-index: var(--z-toast);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   MODALS
   ============================================ */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--color-surface-overlay-dark);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--card-bg);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  transform: scale(0.95);
  transition: transform var(--transition-base);
}

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

.modal-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-tertiary);
  transition: all var(--transition-fast);
}

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

.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* ============================================
   DROPDOWN MENUS
   ============================================ */

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--space-2);
  min-width: 200px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
}

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

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.dropdown-item svg {
  width: 18px;
  height: 18px;
}

.dropdown-divider {
  height: 1px;
  background: var(--border-light);
  margin: var(--space-2) 0;
}

/* ============================================
   TABLES
   ============================================ */

.table-container {
  overflow-x: auto;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
}

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

th, td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

th {
  background: var(--bg-secondary);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  font-size: var(--text-sm);
}

td {
  color: var(--text-secondary);
}

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

tr:hover td {
  background: var(--bg-hover);
}

/* ============================================
   TABS
   ============================================ */

.tabs {
  display: flex;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: var(--space-6);
}

.tab {
  padding: var(--space-3) var(--space-5);
  font-weight: var(--font-medium);
  color: var(--text-tertiary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all var(--transition-fast);
}

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

.tab.active {
  color: var(--brand-primary);
  border-bottom-color: var(--brand-primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ============================================
   EMPTY STATES
   ============================================ */

.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-6);
}

.empty-state-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-6);
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.empty-state-icon svg {
  width: 40px;
  height: 40px;
}

.empty-state-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.empty-state-description {
  color: var(--text-tertiary);
  max-width: 400px;
  margin: 0 auto var(--space-6);
}

/* ============================================
   LOADING STATES
   ============================================ */

.skeleton {
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

/* Skeleton variants for different elements */
.skeleton-text {
  height: 1em;
  min-width: 60px;
  display: inline-block;
  vertical-align: middle;
}

.skeleton-text.short { width: 40px; }
.skeleton-text.medium { width: 80px; }
.skeleton-text.long { width: 120px; }

/* Skeleton for stat values (numbers that start as 0) */
.skeleton-stat {
  display: inline-block;
  min-width: 2ch;
  height: 1.2em;
  vertical-align: middle;
}

/* Skeleton for cards */
.skeleton-card {
  height: 180px;
  border-radius: var(--radius-xl);
}

/* Skeleton for list items */
.skeleton-list-item {
  height: 60px;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
}

.skeleton-list-item:last-child {
  margin-bottom: 0;
}

/* Skeleton for badges/avatars */
.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  flex-shrink: 0;
}

.skeleton-badge {
  width: 72px;
  height: 72px;
  border-radius: 50%;
}

/* Phase 13 (2026 Design Trends) - Enhanced Skeleton Variants */

/* Skeleton title - larger text placeholder */
.skeleton-title {
  height: 1.5em;
  width: 60%;
  margin-bottom: 1em;
}

/* Skeleton button placeholder */
.skeleton-button {
  height: 40px;
  width: 120px;
  border-radius: var(--radius-lg);
}

/* Skeleton paragraph - multiple lines */
.skeleton-paragraph {
  display: flex;
  flex-direction: column;
  gap: 0.5em;
}

.skeleton-paragraph .skeleton-line {
  height: 1em;
  width: 100%;
}

.skeleton-paragraph .skeleton-line:last-child {
  width: 70%;
}

/* Skeleton image placeholder */
.skeleton-image {
  width: 100%;
  height: 200px;
  border-radius: var(--radius-lg);
}

.skeleton-image.square {
  aspect-ratio: 1;
  height: auto;
}

.skeleton-image.video {
  aspect-ratio: 16/9;
  height: auto;
}

/* Skeleton for lesson content */
.skeleton-lesson-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.skeleton-lesson-content .skeleton-video {
  aspect-ratio: 16/9;
  width: 100%;
  border-radius: var(--radius-xl);
}

.skeleton-lesson-content .skeleton-meta {
  display: flex;
  gap: var(--space-4);
}

.skeleton-lesson-content .skeleton-meta-item {
  height: 1em;
  width: 80px;
}

/* Skeleton for course cards */
.skeleton-course-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
}

.skeleton-course-card .skeleton-thumbnail {
  height: 160px;
  border-radius: var(--radius-lg);
}

.skeleton-course-card .skeleton-badge-row {
  display: flex;
  gap: var(--space-2);
}

.skeleton-course-card .skeleton-badge-small {
  height: 20px;
  width: 60px;
  border-radius: var(--radius-full);
}

/* Skeleton for stats cards */
.skeleton-stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
}

.skeleton-stat-card .skeleton-stat-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
}

.skeleton-stat-card .skeleton-stat-value {
  height: 1.5em;
  width: 60%;
}

.skeleton-stat-card .skeleton-stat-label {
  height: 0.875em;
  width: 80%;
}

/* Skeleton grid helper */
.skeleton-grid {
  display: grid;
  gap: var(--space-4);
}

.skeleton-grid.cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.skeleton-grid.cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.skeleton-grid.cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 768px) {
  .skeleton-grid.cols-2,
  .skeleton-grid.cols-3,
  .skeleton-grid.cols-4 {
    grid-template-columns: 1fr;
  }
}

/* Skeleton wrapper - shows skeleton while loading, hides when done */
.skeleton-wrapper {
  position: relative;
}

.skeleton-wrapper[data-loaded="true"] .skeleton-placeholder {
  display: none;
}

.skeleton-wrapper[data-loaded="true"] .content-actual {
  display: block;
}

.skeleton-wrapper:not([data-loaded="true"]) .content-actual {
  display: none;
}

/* Alternative animation: pulse instead of shimmer */
.skeleton.pulse {
  animation: skeleton-pulse 2s ease-in-out infinite;
  background: var(--bg-tertiary);
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

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

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--bg-tertiary);
  border-top-color: var(--brand-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

[data-theme="dark"] .loading-overlay {
  background: rgba(15, 23, 42, 0.8);
}

/* Loading state wrapper - hides content until loaded */
[data-loading="true"] {
  position: relative;
}

[data-loading="true"] > .content-loaded {
  visibility: hidden;
}

[data-loading="true"] > .loading-placeholder {
  display: block;
}

[data-loading="false"] > .loading-placeholder {
  display: none;
}

/* Error state styles */
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  text-align: center;
  color: var(--text-tertiary);
}

.error-state-icon {
  width: 48px;
  height: 48px;
  color: var(--color-error);
  margin-bottom: var(--space-4);
}

.error-state-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.error-state-message {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

/* Fade in animation for loaded content */
.fade-in {
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Stat value loading state - prevents "0" flash */
.stat-value[data-loading="true"],
.hero-stat-value[data-loading="true"],
.team-stat-value[data-loading="true"],
.progress-stat-value[data-loading="true"],
.analytics-summary-value[data-loading="true"] {
  color: transparent;
  position: relative;
}

.stat-value[data-loading="true"]::after,
.hero-stat-value[data-loading="true"]::after,
.team-stat-value[data-loading="true"]::after,
.progress-stat-value[data-loading="true"]::after,
.analytics-summary-value[data-loading="true"]::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

/* ============================================
   VIDEO PLAYER
   ============================================ */

.video-container {
  position: relative;
  background: var(--color-gray-900);
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.video-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-4);
  background: linear-gradient(transparent, var(--color-surface-overlay-darker));
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.video-container:hover .video-controls {
  opacity: 1;
}

.video-progress {
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  cursor: pointer;
}

.video-progress-bar {
  height: 100%;
  background: var(--brand-primary);
  border-radius: var(--radius-full);
  position: relative;
}

.video-progress-bar::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  background: white;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.video-container:hover .video-progress-bar::after {
  opacity: 1;
}

.video-buttons {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: white;
}

.video-buttons button {
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.video-buttons button:hover {
  background: rgba(255, 255, 255, 0.2);
}
/* Note: White rgba values used for video controls for contrast on dark background */

.video-time {
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}

.video-buttons .spacer {
  flex: 1;
}

/* ============================================
   THEME TOGGLE
   ============================================ */

.theme-toggle {
  position: relative;
  width: 60px;
  height: 32px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  cursor: pointer;
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

.theme-toggle::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 24px;
  height: 24px;
  background: var(--brand-primary);
  border-radius: 50%;
  transition: transform var(--transition-base);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .theme-toggle::before {
  transform: translateX(28px);
}

.theme-toggle-icons {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 7px;
  pointer-events: none;
}

.theme-toggle-icons svg {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --space-6: 1rem;
    --space-8: 1.5rem;
  }

  .topbar-search {
    display: none;
  }

  .user-info {
    display: none;
  }

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

  .content {
    padding: var(--space-4);
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  .sidebar,
  .topbar,
  .btn,
  .theme-toggle {
    display: none !important;
  }

  .main-content {
    margin: 0 !important;
  }

  .card {
    box-shadow: none;
    border: 1px solid var(--color-border-print);
  }
}

/* ============================================
   UTILITIES
   ============================================ */

.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); border: 0; }

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-brand { color: var(--brand-primary); }

.bg-primary { background: var(--bg-primary); }
.bg-secondary { background: var(--bg-secondary); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.transition { transition: all var(--transition-base); }
.cursor-pointer { cursor: pointer; }
.select-none { user-select: none; }

/* ============================================
   MOBILE TOUCH TARGET OPTIMIZATION
   WCAG 2.5.5 - Minimum 44x44px touch targets
   Preferred 48x48px for primary actions
   ============================================ */

/* Touch Target Utility Classes */
.touch-target {
  min-height: 44px;
  min-width: 44px;
}

.touch-target-lg {
  min-height: 48px;
  min-width: 48px;
}

/* Ensure proper touch target spacing */
.touch-spacing {
  gap: 8px;
}

.touch-spacing-lg {
  gap: 12px;
}

/* Mobile Touch Target Media Queries */
/* Target all common mobile viewports: 320px-480px */
@media (max-width: 480px) {
  /* ==========================================
     ROOT ADJUSTMENTS FOR MOBILE
     ========================================== */
  :root {
    /* Increase base spacing for touch */
    --touch-target-min: 44px;
    --touch-target-preferred: 48px;
    --touch-spacing: 8px;
  }

  /* ==========================================
     SIDEBAR NAVIGATION ITEMS
     Min height: 44px
     ========================================== */
  .nav-item {
    min-height: 44px;
    padding: var(--space-4) var(--space-4);
    margin: var(--touch-spacing) var(--space-2);
    display: flex;
    align-items: center;
  }

  .nav-section-title {
    padding: var(--space-3) var(--space-4);
    min-height: 36px;
    display: flex;
    align-items: center;
  }

  /* ==========================================
     TAB BUTTONS
     Min height: 44px, increased padding
     ========================================== */
  .tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: var(--touch-spacing);
  }

  .tabs::-webkit-scrollbar {
    display: none;
  }

  .tab {
    min-height: 44px;
    padding: var(--space-3) var(--space-4);
    white-space: nowrap;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  /* ==========================================
     FORM INPUTS
     Height: 48px on mobile for easier input
     ========================================== */
  .form-input,
  .form-select {
    min-height: 48px;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    /* Prevent zoom on iOS */
    font-size: 16px;
  }

  .form-textarea {
    min-height: 120px;
    padding: var(--space-4);
    font-size: 16px;
  }

  .form-label {
    font-size: var(--text-base);
    margin-bottom: var(--space-3);
  }

  .form-group {
    margin-bottom: var(--space-6);
  }

  /* Checkbox and Radio inputs with larger touch targets */
  input[type="checkbox"],
  input[type="radio"] {
    min-width: 24px;
    min-height: 24px;
    margin-right: var(--space-3);
  }

  /* Custom checkbox/radio container for better touch */
  .checkbox-wrapper,
  .radio-wrapper {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: var(--space-2) 0;
    cursor: pointer;
  }

  .checkbox-wrapper label,
  .radio-wrapper label {
    padding-left: var(--space-2);
    flex: 1;
    cursor: pointer;
  }

  /* ==========================================
     BUTTONS
     Min height: 44px (48px for primary/large)
     ========================================== */
  .btn {
    min-height: 44px;
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-base);
  }

  .btn-lg {
    min-height: 48px;
    padding: var(--space-4) var(--space-6);
  }

  .btn-sm {
    min-height: 44px;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
  }

  .btn-primary {
    min-height: 48px;
  }

  /* Full width buttons on mobile forms */
  .form-actions .btn,
  .modal-footer .btn,
  .btn-mobile-full {
    width: 100%;
    justify-content: center;
  }

  /* Stack horizontal button groups */
  .btn-group,
  .button-group,
  .form-actions,
  .action-buttons {
    flex-direction: column;
    gap: var(--touch-spacing);
  }

  .btn-group .btn,
  .button-group .btn {
    width: 100%;
  }

  /* ==========================================
     ICON BUTTONS
     44x44px minimum with pseudo-element hit area
     ========================================== */
  .btn-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    padding: 0;
    position: relative;
  }

  .btn-icon.sm {
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
  }

  /* Extend hit area with pseudo-element for small visual icons */
  .btn-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
  }

  /* ==========================================
     DROPDOWN ITEMS
     Min height: 44px
     ========================================== */
  .dropdown-item {
    min-height: 44px;
    padding: var(--space-3) var(--space-4);
    display: flex;
    align-items: center;
  }

  .dropdown-menu {
    min-width: 220px;
  }

  /* ==========================================
     MODAL CLOSE BUTTONS
     44x44px touch target
     ========================================== */
  .modal-close {
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .modal-header {
    padding: var(--space-4) var(--space-5);
  }

  .modal-footer {
    padding: var(--space-4) var(--space-5);
    flex-direction: column;
    gap: var(--touch-spacing);
  }

  .modal-footer .btn {
    width: 100%;
  }

  /* ==========================================
     CARD ACTION BUTTONS
     Larger tap areas for cards
     ========================================== */
  .card {
    /* Disable hover transform on touch devices */
    transform: none !important;
  }

  .card:hover {
    transform: none !important;
  }

  .card-header {
    padding: var(--space-4) var(--space-5);
    min-height: 56px;
  }

  .card-body {
    padding: var(--space-5);
  }

  .card-footer {
    padding: var(--space-4) var(--space-5);
    min-height: 56px;
  }

  /* Make entire card tappable if it's a link */
  .card[onclick],
  .card-link,
  a.card {
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }

  /* Course card touch improvements */
  .course-card {
    min-height: 100px;
  }

  .course-card-content {
    padding: var(--space-4);
  }

  .course-card-badge {
    padding: var(--space-2) var(--space-3);
    min-height: 28px;
  }

  /* ==========================================
     PAGINATION CONTROLS
     44px touch targets
     ========================================== */
  .pagination {
    display: flex;
    gap: var(--touch-spacing);
    flex-wrap: wrap;
    justify-content: center;
  }

  .pagination-item,
  .pagination-btn,
  .page-link {
    min-width: 44px;
    min-height: 44px;
    padding: var(--space-2);
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .pagination-prev,
  .pagination-next {
    min-width: 44px;
    min-height: 44px;
  }

  /* ==========================================
     TOAST DISMISS BUTTONS
     44x44px touch target
     ========================================== */
  .toast {
    padding: var(--space-4);
    gap: var(--space-3);
  }

  .toast-close,
  .toast-dismiss,
  .toast button {
    min-width: 44px;
    min-height: 44px;
    padding: var(--space-2);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  /* Position toast for thumb reach */
  .toast {
    bottom: var(--space-4);
    left: var(--space-4);
    right: var(--space-4);
    max-width: calc(100vw - var(--space-8));
  }

  /* ==========================================
     ALERT DISMISS BUTTONS
     ========================================== */
  .alert {
    padding: var(--space-4);
  }

  .alert-dismiss,
  .alert button {
    min-width: 44px;
    min-height: 44px;
    flex-shrink: 0;
  }

  /* ==========================================
     AVATAR & USER ELEMENTS
     Ensure tappable
     ========================================== */
  .user-menu {
    min-height: 48px;
    padding: var(--space-3);
  }

  .avatar {
    min-width: 40px;
    min-height: 40px;
  }

  .avatar.clickable,
  .avatar[onclick],
  a .avatar {
    min-width: 44px;
    min-height: 44px;
  }

  /* ==========================================
     TABLE MOBILE ADJUSTMENTS
     ========================================== */
  th, td {
    padding: var(--space-4);
    min-height: 48px;
  }

  /* Make table rows tappable */
  tr[onclick],
  tr.clickable {
    cursor: pointer;
    min-height: 48px;
  }

  /* Table action buttons */
  .table-action,
  .table-actions .btn,
  .row-action {
    min-width: 44px;
    min-height: 44px;
    padding: var(--space-2);
  }

  /* ==========================================
     THEME TOGGLE
     Ensure 44px touch target
     ========================================== */
  .theme-toggle {
    min-width: 60px;
    min-height: 44px;
    padding: 6px;
  }

  /* ==========================================
     TOPBAR MOBILE ADJUSTMENTS
     ========================================== */
  .topbar {
    padding: 0 var(--space-4);
  }

  .topbar-btn,
  .topbar button {
    min-width: 44px;
    min-height: 44px;
  }

  .topbar-right {
    gap: var(--touch-spacing);
  }

  /* Menu toggle / hamburger button */
  .menu-toggle,
  .sidebar-toggle,
  .mobile-menu-btn {
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* ==========================================
     SEARCH INPUT
     48px height for easy tapping
     ========================================== */
  .topbar-search input,
  .search-input,
  input[type="search"] {
    min-height: 48px;
    font-size: 16px;
    padding: var(--space-3) var(--space-4);
    padding-left: 44px;
  }

  .topbar-search svg,
  .search-icon {
    left: var(--space-3);
    width: 20px;
    height: 20px;
  }

  /* Search clear button */
  .search-clear,
  .input-clear {
    min-width: 44px;
    min-height: 44px;
    right: 0;
  }

  /* ==========================================
     VIDEO CONTROLS
     Larger touch targets for video player
     ========================================== */
  .video-buttons button {
    min-width: 44px;
    min-height: 44px;
    padding: var(--space-2);
  }

  .video-progress {
    height: 8px;
    /* Increase touch area */
    padding: 12px 0;
    margin: -12px 0;
    background-clip: content-box;
  }

  .video-controls {
    padding: var(--space-4);
    gap: var(--space-4);
  }

  /* ==========================================
     STAT CARDS
     Ensure interactive elements are tappable
     ========================================== */
  .stat-card {
    padding: var(--space-5);
    min-height: 80px;
  }

  .stat-icon {
    min-width: 44px;
    min-height: 44px;
  }

  /* ==========================================
     BADGE & TAG TOUCH IMPROVEMENTS
     ========================================== */
  .badge.clickable,
  .badge[onclick],
  a .badge {
    min-height: 32px;
    padding: var(--space-2) var(--space-3);
  }

  .tag.clickable,
  .tag[onclick],
  a .tag {
    min-height: 32px;
    padding: var(--space-2) var(--space-3);
  }

  /* Filter tags that are interactive */
  .filter-tag,
  .tag-removable {
    min-height: 36px;
    padding: var(--space-2) var(--space-3);
  }

  .tag-remove,
  .filter-tag-remove {
    min-width: 32px;
    min-height: 32px;
    margin-left: var(--space-2);
  }

  /* ==========================================
     LINK TOUCH IMPROVEMENTS
     ========================================== */
  a {
    /* Ensure links have adequate touch target in lists */
    display: inline-block;
  }

  /* Navigation links in lists */
  nav a,
  .nav-link,
  .breadcrumb a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-1);
  }

  /* ==========================================
     PROGRESS BAR TOUCH (if interactive)
     ========================================== */
  .progress.interactive,
  .progress[onclick] {
    min-height: 44px;
    padding: 18px 0;
    margin: -18px 0;
    background-clip: content-box;
    cursor: pointer;
  }

  /* ==========================================
     EMPTY STATE BUTTONS
     ========================================== */
  .empty-state .btn {
    min-height: 48px;
    padding: var(--space-4) var(--space-6);
  }

  /* ==========================================
     CONTENT AREA ADJUSTMENTS
     ========================================== */
  .content {
    padding: var(--space-4);
  }

  /* ==========================================
     TYPOGRAPHY ADJUSTMENTS FOR READABILITY
     ========================================== */
  body {
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
  }

  p {
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
  }

  /* Increase small text for readability */
  small,
  .text-sm,
  .text-xs {
    font-size: var(--text-sm);
  }

  /* ==========================================
     PREVENT ACCIDENTAL TAPS
     ========================================== */
  /* Add debounce/delay for critical actions */
  .btn-danger,
  .btn-delete,
  [data-action="delete"],
  [data-action="remove"] {
    -webkit-tap-highlight-color: rgba(239, 68, 68, 0.2);
  }

  /* Disable double-tap zoom on interactive elements */
  button,
  a,
  input,
  select,
  textarea,
  .btn,
  .nav-item,
  .tab,
  .dropdown-item,
  .card[onclick] {
    touch-action: manipulation;
  }
}

/* ==========================================
   ADDITIONAL BREAKPOINT: 375px (iPhone 12/13)
   ========================================== */
@media (max-width: 375px) {
  .btn {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
  }

  .btn-lg {
    padding: var(--space-3) var(--space-5);
  }

  .content {
    padding: var(--space-3);
  }

  .card-body {
    padding: var(--space-4);
  }

  .modal {
    margin: var(--space-3);
    max-height: calc(100vh - var(--space-6));
  }

  .modal-body {
    padding: var(--space-4);
  }

  /* Ensure minimum touch targets still maintained */
  .btn,
  .btn-sm,
  .btn-icon,
  .nav-item,
  .tab,
  .dropdown-item {
    min-height: 44px;
  }
}

/* ==========================================
   ADDITIONAL BREAKPOINT: 320px (iPhone SE)
   ========================================== */
@media (max-width: 320px) {
  :root {
    --space-4: 0.875rem;
    --space-5: 1rem;
    --space-6: 1.25rem;
  }

  .content {
    padding: var(--space-3);
  }

  .btn {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    min-height: 44px;
  }

  .tabs {
    gap: 4px;
  }

  .tab {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    min-height: 44px;
  }

  .form-input,
  .form-select {
    padding: var(--space-2) var(--space-3);
    min-height: 48px;
  }

  .card-header,
  .card-footer {
    padding: var(--space-3) var(--space-4);
  }

  .card-body {
    padding: var(--space-4);
  }

  /* Stack all button groups */
  .btn-group,
  .button-group,
  .form-actions,
  .action-buttons,
  .modal-footer {
    flex-direction: column;
    gap: var(--space-2);
  }

  .modal-footer .btn {
    width: 100%;
    min-height: 44px;
  }
}

/* ==========================================
   TOUCH DEVICE DETECTION (hover capability)
   ========================================== */
@media (hover: none) and (pointer: coarse) {
  /* Devices with touch as primary input */

  /* Remove hover effects that don't work well on touch */
  .card:hover {
    transform: none;
  }

  /* Ensure all interactive elements have touch feedback */
  .btn:active,
  .nav-item:active,
  .tab:active,
  .dropdown-item:active,
  .card[onclick]:active {
    opacity: 0.8;
    transform: scale(0.98);
  }

  /* Increase all touch targets */
  button,
  [role="button"],
  a[href],
  input[type="button"],
  input[type="submit"],
  input[type="reset"] {
    min-height: 44px;
  }

  /* Ensure adequate spacing between touch targets */
  .nav-item + .nav-item,
  .tab + .tab,
  .btn + .btn,
  .dropdown-item + .dropdown-item {
    margin-top: 4px;
  }
}

/* ==========================================
   SAFE AREA INSETS (for notched devices)
   iPhone X+, modern Android with notches/punch-holes

   IMPORTANT: Requires viewport meta tag with viewport-fit=cover:
   <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">

   env() function provides safe-area-inset values:
   - safe-area-inset-top: Status bar / notch area (top)
   - safe-area-inset-bottom: Home indicator / gesture area (bottom)
   - safe-area-inset-left: Screen edge padding (landscape left)
   - safe-area-inset-right: Screen edge padding (landscape right)
   ========================================== */

/* CSS Custom Properties for safe area insets with fallbacks */
:root {
  --safe-area-top: env(safe-area-inset-top, 0px);
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-left: env(safe-area-inset-left, 0px);
  --safe-area-right: env(safe-area-inset-right, 0px);
}

@supports (padding: env(safe-area-inset-bottom)) {
  /* ===========================================
     FIXED HEADERS / TOPBARS
     Add padding for devices with notches/status bars
     =========================================== */
  .topbar {
    padding-top: calc(var(--space-2) + env(safe-area-inset-top, 0px));
    padding-left: calc(var(--space-6) + env(safe-area-inset-left, 0px));
    padding-right: calc(var(--space-6) + env(safe-area-inset-right, 0px));
  }

  /* Adjust topbar height to account for safe area */
  .topbar.fixed-top,
  .topbar[data-fixed="true"] {
    min-height: calc(var(--topbar-height) + env(safe-area-inset-top, 0px));
  }

  /* ===========================================
     SIDEBAR NAVIGATION
     Account for safe areas on left/bottom
     =========================================== */
  .sidebar {
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    padding-left: env(safe-area-inset-left, 0px);
  }

  .sidebar-header {
    padding-top: calc(var(--space-5) + env(safe-area-inset-top, 0px));
  }

  /* ===========================================
     BOTTOM NAVIGATION BARS
     Critical for devices with home indicators
     =========================================== */
  .bottom-nav {
    padding-bottom: env(safe-area-inset-bottom, 0px);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
  }

  /* Ensure bottom nav height includes safe area */
  .bottom-nav-inner {
    min-height: 64px;
  }

  /* ===========================================
     MODAL CONTENT AREAS
     Ensure modal content respects safe areas
     =========================================== */
  .modal {
    margin-top: calc(var(--space-6) + env(safe-area-inset-top, 0px));
    margin-bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
    margin-left: calc(var(--space-4) + env(safe-area-inset-left, 0px));
    margin-right: calc(var(--space-4) + env(safe-area-inset-right, 0px));
  }

  .modal-header {
    padding-top: calc(var(--space-5) + env(safe-area-inset-top, 0px));
  }

  .modal-footer {
    padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
  }

  /* Full-screen modals need full safe area coverage */
  .modal-fullscreen,
  .modal-full {
    margin: 0;
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
  }

  /* ===========================================
     TOAST NOTIFICATIONS
     Position above home indicator
     =========================================== */
  .toast {
    bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
    left: calc(var(--space-4) + env(safe-area-inset-left, 0px));
    right: calc(var(--space-4) + env(safe-area-inset-right, 0px));
  }

  .toast-container {
    bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
    left: calc(var(--space-6) + env(safe-area-inset-left, 0px));
    right: calc(var(--space-6) + env(safe-area-inset-right, 0px));
  }

  /* ===========================================
     FLOATING ACTION BUTTONS (FAB)
     Position above bottom nav and home indicator
     =========================================== */
  .fab {
    bottom: calc(64px + var(--space-4) + env(safe-area-inset-bottom, 0px));
    right: calc(var(--space-4) + env(safe-area-inset-right, 0px));
  }

  /* FAB without bottom nav */
  .fab.fab-standalone {
    bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
  }

  /* ===========================================
     MAIN CONTENT AREA
     Ensure content doesn't get hidden behind safe areas
     =========================================== */
  .content,
  .main-content > .content {
    padding-bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
  }

  /* Content when bottom nav is present */
  body.has-bottom-nav .content,
  body.has-bottom-nav .main-content > .content {
    padding-bottom: calc(var(--space-6) + 64px + env(safe-area-inset-bottom, 0px));
  }

  /* ===========================================
     DROPDOWNS & POPOVERS
     Ensure they respect horizontal safe areas
     =========================================== */
  .dropdown-menu {
    max-width: calc(100vw - env(safe-area-inset-left, 0px) - env(safe-area-inset-right, 0px) - var(--space-4));
  }

  /* ===========================================
     FIXED BOTTOM ELEMENTS
     Generic class for any fixed bottom element
     =========================================== */
  .fixed-bottom,
  [data-position="fixed-bottom"] {
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  /* ===========================================
     STICKY ELEMENTS
     Adjust sticky positioning for safe areas
     =========================================== */
  .sticky-top {
    top: env(safe-area-inset-top, 0px);
  }

  .sticky-bottom {
    bottom: env(safe-area-inset-bottom, 0px);
  }

  /* ===========================================
     FORM ACTIONS (typically at bottom)
     Common pattern for forms with submit buttons
     =========================================== */
  .form-actions.fixed-bottom,
  .form-footer.fixed-bottom {
    padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
    padding-left: calc(var(--space-4) + env(safe-area-inset-left, 0px));
    padding-right: calc(var(--space-4) + env(safe-area-inset-right, 0px));
  }
}

/* ===========================================
   LANDSCAPE MODE SAFE AREAS
   Handle notch in landscape orientation
   =========================================== */
@media (orientation: landscape) {
  @supports (padding: env(safe-area-inset-left)) {
    .sidebar {
      padding-left: env(safe-area-inset-left, 0px);
    }

    .main-content {
      padding-right: env(safe-area-inset-right, 0px);
    }

    /* Adjust content width in landscape */
    .content {
      padding-left: calc(var(--space-6) + env(safe-area-inset-left, 0px));
      padding-right: calc(var(--space-6) + env(safe-area-inset-right, 0px));
    }
  }
}

/* ============================================
   SCROLL-TRIGGERED REVEAL ANIMATIONS
   Phase 13: 2026 Design Trends
   ============================================ */

/* Base animation state - hidden before reveal */
[data-animate] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

/* Revealed state */
[data-animate].animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* Animation variants */
[data-animate="fade"] {
  transform: none;
}

[data-animate="fade"].animate-in {
  opacity: 1;
}

[data-animate="slide-up"] {
  transform: translateY(30px);
}

[data-animate="slide-up"].animate-in {
  transform: translateY(0);
}

[data-animate="slide-down"] {
  transform: translateY(-20px);
}

[data-animate="slide-down"].animate-in {
  transform: translateY(0);
}

[data-animate="slide-left"] {
  transform: translateX(-30px);
}

[data-animate="slide-left"].animate-in {
  transform: translateX(0);
}

[data-animate="slide-right"] {
  transform: translateX(30px);
}

[data-animate="slide-right"].animate-in {
  transform: translateX(0);
}

[data-animate="scale"] {
  transform: scale(0.95);
}

[data-animate="scale"].animate-in {
  transform: scale(1);
}

[data-animate="scale-up"] {
  transform: scale(0.9);
}

[data-animate="scale-up"].animate-in {
  transform: scale(1);
}

/* Staggered children animations */
[data-animate-stagger] > * {
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

[data-animate-stagger].animate-in > *:nth-child(1) { transition-delay: 0s; }
[data-animate-stagger].animate-in > *:nth-child(2) { transition-delay: 0.1s; }
[data-animate-stagger].animate-in > *:nth-child(3) { transition-delay: 0.2s; }
[data-animate-stagger].animate-in > *:nth-child(4) { transition-delay: 0.3s; }
[data-animate-stagger].animate-in > *:nth-child(5) { transition-delay: 0.4s; }
[data-animate-stagger].animate-in > *:nth-child(6) { transition-delay: 0.5s; }
[data-animate-stagger].animate-in > *:nth-child(7) { transition-delay: 0.6s; }
[data-animate-stagger].animate-in > *:nth-child(8) { transition-delay: 0.7s; }
[data-animate-stagger].animate-in > *:nth-child(9) { transition-delay: 0.8s; }
[data-animate-stagger].animate-in > *:nth-child(10) { transition-delay: 0.9s; }
[data-animate-stagger].animate-in > *:nth-child(n+11) { transition-delay: 1s; }

[data-animate-stagger].animate-in > * {
  opacity: 1;
  transform: translateY(0);
}

/* Custom delay classes */
[data-animate-delay="100"] { transition-delay: 0.1s; }
[data-animate-delay="200"] { transition-delay: 0.2s; }
[data-animate-delay="300"] { transition-delay: 0.3s; }
[data-animate-delay="400"] { transition-delay: 0.4s; }
[data-animate-delay="500"] { transition-delay: 0.5s; }

/* Custom duration classes */
[data-animate-duration="fast"] { transition-duration: 0.3s; }
[data-animate-duration="slow"] { transition-duration: 0.8s; }

/* ============================================
   REDUCED MOTION SUPPORT
   WCAG 2.3.3 - Animation from Interactions
   ============================================ */

@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;
  }

  /* Disable scroll-triggered animations - show content immediately */
  [data-animate],
  [data-animate-stagger] > * {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  /* Disable skeleton shimmer animation */
  .skeleton {
    animation: none !important;
    background: var(--bg-tertiary) !important;
  }

  /* Disable spinner rotation */
  .spinner,
  .loading-spinner {
    animation: none !important;
    border-top-color: var(--brand-primary) !important;
  }

  /* Disable card hover transforms */
  .card:hover,
  .course-card:hover,
  .stat-card:hover {
    transform: none !important;
  }

  /* Disable button hover effects */
  .btn:hover {
    transform: none !important;
  }

  /* Disable modal animations */
  .modal-backdrop,
  .modal-backdrop.open .modal {
    transition: none !important;
    transform: none !important;
  }

  /* Disable dropdown animations */
  .dropdown-menu {
    transition: none !important;
    transform: none !important;
  }

  /* Disable toast slide animation */
  .toast {
    animation: none !important;
  }

  /* Disable sidebar slide animation */
  .sidebar {
    transition: none !important;
  }

  /* Disable progress bar transitions */
  .progress-bar,
  .level-progress-bar-fill {
    transition: none !important;
  }

  /* Disable video control transitions */
  .video-controls {
    transition: none !important;
    opacity: 1 !important;
  }

  /* Disable theme toggle animation */
  .theme-toggle::before {
    transition: none !important;
  }

  /* Ensure essential state changes still work */
  .modal-backdrop {
    transition: opacity 0.01ms !important;
  }

  .modal-backdrop.open {
    opacity: 1;
    visibility: visible;
  }

  /* Disable scroll behavior */
  html {
    scroll-behavior: auto !important;
  }
}

/* ============================================
   ACCESSIBILITY UTILITIES
   ============================================ */

/* Focus visible outline for keyboard navigation */
.focus-visible:focus-visible,
*:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

/* Interactive elements get enhanced focus ring with glow */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="button"]:focus-visible,
[tabindex]:focus-visible:not([tabindex="-1"]) {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
  box-shadow: var(--color-primary-focus-glow);
}

/* Dark theme focus adjustment for better visibility */
[data-theme="dark"] button:focus-visible,
[data-theme="dark"] a:focus-visible,
[data-theme="dark"] [role="button"]:focus-visible {
  outline-color: var(--brand-primary-light);
  box-shadow: var(--color-primary-focus-glow);
}

/* Remove outline for mouse users */
*:focus:not(:focus-visible) {
  outline: none;
}

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

/* Focusable screen reader content */
.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static !important;
  width: auto !important;
  height: auto !important;
  padding: inherit !important;
  margin: inherit !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
}

/* Skip link for keyboard navigation */
.skip-link,
.skip-to-content {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: var(--z-max, 9999);
  padding: 0.75rem 1.25rem;
  background: var(--color-primary-500, var(--brand-primary));
  color: white;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
}

.skip-link:focus,
.skip-to-content:focus {
  position: fixed;
  left: 0;
  top: 0;
  width: auto;
  height: auto;
  overflow: visible;
  outline: 3px solid white;
  outline-offset: 2px;
}

/* ============================================
   GLOBAL SEARCH TRIGGER BUTTON
   ============================================ */

.search-trigger-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--text-sm);
  font-family: inherit;
}

.search-trigger-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--brand-primary);
}

.search-trigger-btn svg {
  width: 18px;
  height: 18px;
}

.search-trigger-btn .search-trigger-text {
  display: none;
}

@media (min-width: 768px) {
  .search-trigger-btn .search-trigger-text {
    display: inline;
  }
}

.search-trigger-btn kbd {
  display: none;
  padding: 0.125rem 0.375rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-family: inherit;
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .search-trigger-btn kbd {
    display: inline;
  }
}

/* ============================================
   HIGH CONTRAST THEME
   WCAG AAA Compliant (7:1+ contrast ratio)
   ============================================ */

[data-theme="high-contrast"] {
  /* Background Colors - Pure black for maximum contrast */
  --bg-primary: #000000;
  --bg-secondary: #000000;
  --bg-tertiary: #1a1a1a;
  --bg-hover: #333333;
  --bg-active: #4d4d4d;

  /* Text Colors - Pure white for maximum contrast */
  --text-primary: #FFFFFF;
  --text-secondary: #FFFFFF;
  --text-tertiary: #e6e6e6;
  --text-muted: #cccccc;
  --text-inverse: #000000;

  /* High Contrast Borders */
  --border-light: #FFFFFF;
  --border-medium: #FFFFFF;
  --border-dark: #FFFFFF;

  /* Card Styles */
  --card-bg: #000000;
  --card-border: #FFFFFF;
  --card-shadow: none;

  /* Input Styles */
  --input-bg: #000000;
  --input-border: #FFFFFF;
  --input-focus: #FFFF00;

  /* Sidebar */
  --sidebar-bg: #000000;
  --sidebar-border: #FFFFFF;
  --sidebar-text: #FFFFFF;
  --sidebar-active: #FFFFFF;

  /* Topbar */
  --topbar-bg: #000000;
  --topbar-border: #FFFFFF;

  /* Code Background */
  --code-bg: #1a1a1a;

  /* Semantic Colors - High Contrast Versions */
  --color-success: #00FF00;
  --color-success-bg: #000000;
  --color-warning: #FFFF00;
  --color-warning-bg: #000000;
  --color-error: #FF0000;
  --color-error-bg: #000000;
  --color-info: #00FFFF;
  --color-info-bg: #000000;

  /* Brand Colors - Brighter for visibility */
  --brand-primary: #FF6600;
  --brand-primary-dark: #FF8533;
  --brand-primary-light: #FF9966;

  /* Disable shadows for cleaner high-contrast look */
  --shadow-sm: none;
  --shadow-md: none;
  --shadow-lg: none;
  --shadow-xl: none;
  --shadow-glow: none;
}

/* High Contrast Typography Enhancements */
[data-theme="high-contrast"] body {
  font-weight: 500;
  letter-spacing: 0.01em;
}

[data-theme="high-contrast"] h1,
[data-theme="high-contrast"] h2,
[data-theme="high-contrast"] h3,
[data-theme="high-contrast"] h4,
[data-theme="high-contrast"] h5,
[data-theme="high-contrast"] h6 {
  font-weight: var(--font-bold);
}

/* High Contrast Links - Always Underlined */
[data-theme="high-contrast"] a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

[data-theme="high-contrast"] a:hover {
  text-decoration-thickness: 2px;
}

/* High Contrast Focus States - Thicker Outlines (3px) */
[data-theme="high-contrast"] *:focus {
  outline: 3px solid #FFFF00 !important;
  outline-offset: 2px !important;
}

[data-theme="high-contrast"] *:focus-visible {
  outline: 3px solid #FFFF00 !important;
  outline-offset: 2px !important;
}

/* High Contrast Form Elements */
[data-theme="high-contrast"] .form-input,
[data-theme="high-contrast"] .form-select,
[data-theme="high-contrast"] .form-textarea {
  border-width: 2px;
  border-color: #FFFFFF;
}

[data-theme="high-contrast"] .form-input:focus,
[data-theme="high-contrast"] .form-select:focus,
[data-theme="high-contrast"] .form-textarea:focus {
  border-color: #FFFF00;
  box-shadow: 0 0 0 3px #FFFF00;
}

/* High Contrast Buttons */
[data-theme="high-contrast"] .btn {
  border: 2px solid currentColor;
  font-weight: var(--font-bold);
}

[data-theme="high-contrast"] .btn-primary {
  background: #FF6600;
  color: #000000;
  border-color: #FF6600;
}

[data-theme="high-contrast"] .btn-primary:hover:not(:disabled) {
  background: #FFFFFF;
  color: #000000;
  border-color: #FFFFFF;
}

[data-theme="high-contrast"] .btn-secondary {
  background: #000000;
  color: #FFFFFF;
  border-color: #FFFFFF;
}

[data-theme="high-contrast"] .btn-secondary:hover:not(:disabled) {
  background: #FFFFFF;
  color: #000000;
}

[data-theme="high-contrast"] .btn-ghost {
  border-color: #FFFFFF;
}

[data-theme="high-contrast"] .btn-ghost:hover:not(:disabled) {
  background: #FFFFFF;
  color: #000000;
}

[data-theme="high-contrast"] .btn-success {
  background: #00FF00;
  color: #000000;
  border-color: #00FF00;
}

[data-theme="high-contrast"] .btn-danger {
  background: #FF0000;
  color: #FFFFFF;
  border-color: #FF0000;
}

/* High Contrast Cards - Solid Borders */
[data-theme="high-contrast"] .card {
  border: 2px solid #FFFFFF;
  box-shadow: none;
}

[data-theme="high-contrast"] .card:hover {
  transform: none;
  box-shadow: none;
  border-color: #FFFF00;
}

/* High Contrast Navigation */
[data-theme="high-contrast"] .nav-item {
  border: 1px solid transparent;
}

[data-theme="high-contrast"] .nav-item:hover {
  border-color: #FFFFFF;
}

[data-theme="high-contrast"] .nav-item.active {
  background: #FFFFFF;
  color: #000000;
  border-color: #FFFFFF;
}

/* High Contrast Tabs */
[data-theme="high-contrast"] .tab {
  border-bottom-width: 3px;
}

[data-theme="high-contrast"] .tab.active {
  border-bottom-color: #FFFF00;
}

/* High Contrast Badges */
[data-theme="high-contrast"] .badge {
  border: 1px solid currentColor;
  background: #000000;
}

[data-theme="high-contrast"] .badge-primary {
  color: #FF6600;
  border-color: #FF6600;
}

[data-theme="high-contrast"] .badge-success {
  color: #00FF00;
  border-color: #00FF00;
}

[data-theme="high-contrast"] .badge-warning {
  color: #FFFF00;
  border-color: #FFFF00;
}

[data-theme="high-contrast"] .badge-error {
  color: #FF0000;
  border-color: #FF0000;
}

[data-theme="high-contrast"] .badge-info {
  color: #00FFFF;
  border-color: #00FFFF;
}

/* High Contrast Alerts */
[data-theme="high-contrast"] .alert {
  border-width: 2px;
  background: #000000;
}

[data-theme="high-contrast"] .alert-success {
  border-color: #00FF00;
  color: #00FF00;
}

[data-theme="high-contrast"] .alert-warning {
  border-color: #FFFF00;
  color: #FFFF00;
}

[data-theme="high-contrast"] .alert-error {
  border-color: #FF0000;
  color: #FF0000;
}

[data-theme="high-contrast"] .alert-info {
  border-color: #00FFFF;
  color: #00FFFF;
}

/* High Contrast Progress Bars - Remove Gradients, Solid Colors */
[data-theme="high-contrast"] .progress {
  border: 1px solid #FFFFFF;
}

[data-theme="high-contrast"] .progress-bar {
  background: #FF6600;
}

[data-theme="high-contrast"] .progress-bar.success {
  background: #00FF00;
}

[data-theme="high-contrast"] .progress-bar.warning {
  background: #FFFF00;
}

/* High Contrast Modal */
[data-theme="high-contrast"] .modal {
  border: 3px solid #FFFFFF;
}

[data-theme="high-contrast"] .modal-backdrop {
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: none;
}

/* High Contrast Table */
[data-theme="high-contrast"] th,
[data-theme="high-contrast"] td {
  border: 1px solid #FFFFFF;
}

[data-theme="high-contrast"] th {
  background: #1a1a1a;
}

[data-theme="high-contrast"] tr:hover td {
  background: #333333;
}

/* High Contrast Avatar */
[data-theme="high-contrast"] .avatar {
  background: #FFFFFF;
  color: #000000;
  border: 2px solid #FFFFFF;
}

/* High Contrast Theme Toggle */
[data-theme="high-contrast"] .theme-toggle {
  border: 2px solid #FFFFFF;
}

/* High Contrast Loading States - No Shimmer Animation */
[data-theme="high-contrast"] .skeleton {
  background: #333333;
  animation: none;
}

/* High Contrast Dropdown */
[data-theme="high-contrast"] .dropdown-menu {
  border: 2px solid #FFFFFF;
}

[data-theme="high-contrast"] .dropdown-item:hover {
  background: #FFFFFF;
  color: #000000;
}

/* High Contrast Stat Cards */
[data-theme="high-contrast"] .stat-card {
  border: 2px solid #FFFFFF;
}

[data-theme="high-contrast"] .stat-card:hover {
  border-color: #FFFF00;
  box-shadow: none;
}

[data-theme="high-contrast"] .stat-icon {
  background: #1a1a1a;
  border: 1px solid #FFFFFF;
}

/* High Contrast Video Container */
[data-theme="high-contrast"] .video-container {
  border: 2px solid #FFFFFF;
}

/* High Contrast Course Card */
[data-theme="high-contrast"] .course-card-image {
  background: #1a1a1a;
}

[data-theme="high-contrast"] .course-card-badge {
  border: 1px solid currentColor;
}

/* High Contrast Toggle Switch */
[data-theme="high-contrast"] .toggle-slider {
  background: #333333;
  border: 2px solid #FFFFFF;
}

[data-theme="high-contrast"] .toggle-switch input:checked + .toggle-slider {
  background: #00FF00;
}

/* ============================================
   MANUAL REDUCED MOTION TOGGLE
   User-controlled animation preference
   ============================================ */

[data-reduce-motion="true"] *,
[data-reduce-motion="true"] *::before,
[data-reduce-motion="true"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

[data-reduce-motion="true"] .skeleton {
  animation: none !important;
  background: var(--bg-tertiary) !important;
}

[data-reduce-motion="true"] .spinner,
[data-reduce-motion="true"] .loading-spinner {
  animation: none !important;
}

[data-reduce-motion="true"] .toast {
  animation: none !important;
}

[data-reduce-motion="true"] .modal,
[data-reduce-motion="true"] .modal-backdrop {
  transition: none !important;
}

[data-reduce-motion="true"] .sidebar {
  transition: none !important;
}

[data-reduce-motion="true"] .dropdown-menu {
  transition: none !important;
  transform: none !important;
}

[data-reduce-motion="true"] .card:hover,
[data-reduce-motion="true"] .course-card:hover,
[data-reduce-motion="true"] .stat-card:hover {
  transform: none !important;
}

[data-reduce-motion="true"] .btn:hover {
  transform: none !important;
}

[data-reduce-motion="true"] .progress-bar,
[data-reduce-motion="true"] .level-progress-bar-fill {
  transition: none !important;
}

[data-reduce-motion="true"] .video-controls {
  transition: none !important;
  opacity: 1 !important;
}

[data-reduce-motion="true"] .theme-toggle::before {
  transition: none !important;
}

[data-reduce-motion="true"] html {
  scroll-behavior: auto !important;
}

/* Alternative visual feedback for reduced motion */
[data-reduce-motion="true"] .btn:hover:not(:disabled) {
  opacity: 0.85;
}

[data-reduce-motion="true"] .card:hover {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

[data-reduce-motion="true"] .nav-item:hover {
  opacity: 0.85;
}

/* Static loading indicator for reduced motion */
[data-reduce-motion="true"] .spinner,
[data-reduce-motion="true"] .loading-spinner {
  border-style: dotted;
}

/* ============================================
   BREADCRUMB NAVIGATION
   Consistent breadcrumb component for navigation hierarchy
   ============================================ */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  padding: var(--space-1) 0;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.breadcrumb-item a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.breadcrumb-item a:hover {
  color: var(--brand-primary);
}

.breadcrumb-item a:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.breadcrumb-separator {
  color: var(--text-muted);
  user-select: none;
  flex-shrink: 0;
}

.breadcrumb-separator svg {
  width: 16px;
  height: 16px;
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: var(--font-medium);
  max-width: 200px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Home icon in breadcrumb */
.breadcrumb-home {
  display: flex;
  align-items: center;
  justify-content: center;
}

.breadcrumb-home svg {
  width: 18px;
  height: 18px;
}

/* Responsive breadcrumbs */
@media (max-width: 640px) {
  .breadcrumb {
    font-size: var(--text-xs);
    gap: var(--space-1);
  }

  .breadcrumb-current {
    max-width: 120px;
  }

  /* Hide intermediate items on mobile, show only first and last */
  .breadcrumb-item.breadcrumb-intermediate {
    display: none;
  }
}

/* ============================================
   BACK BUTTON COMPONENT
   Consistent back navigation with history support
   ============================================ */

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.back-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-dark);
}

.back-btn:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

.back-btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.back-btn-text {
  white-space: nowrap;
}

/* Hide text on mobile, show only icon */
@media (max-width: 640px) {
  .back-btn {
    padding: var(--space-2);
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
  }

  .back-btn-text {
    display: none;
  }
}

/* Back button as primary mobile navigation */
.back-btn-mobile {
  display: none;
  padding: var(--space-3);
  min-width: 48px;
  min-height: 48px;
  border-radius: var(--radius-xl);
}

@media (max-width: 640px) {
  .back-btn-mobile {
    display: inline-flex;
  }
}

/* ============================================
   PAGE HEADER WITH NAVIGATION
   Combined header component with back button and breadcrumbs
   ============================================ */

.page-nav-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
  min-width: 0;
}

.page-nav-header .back-btn {
  margin-right: var(--space-2);
}

/* ============================================
   DEAD-END PAGE NAVIGATION
   Styles for error pages and offline pages
   ============================================ */

.dead-end-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
  margin-top: var(--space-6);
}

@media (min-width: 480px) {
  .dead-end-actions {
    flex-direction: row;
    justify-content: center;
  }
}

.dead-end-actions .btn {
  min-width: 160px;
}

.dead-end-actions .btn-primary {
  order: -1;
}

/* Link styled as secondary action */
.dead-end-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.dead-end-link:hover {
  color: var(--brand-primary);
}

/* ============================================
   NAVIGATION UTILITIES
   Helper classes for navigation components
   ============================================ */

/* Skip link for accessibility */
.skip-nav {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: var(--z-max);
  padding: var(--space-3) var(--space-4);
  background: var(--brand-primary);
  color: white;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: var(--font-semibold);
  transition: top var(--transition-fast);
}

.skip-nav:focus {
  top: var(--space-4);
}

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

/* ============================================
   MOBILE NAVIGATION - Phase 6 UX Improvements
   ============================================ */

/* ===========================================
   HAMBURGER MENU BUTTON
   Visible below 768px, triggers sidebar
   =========================================== */

.mobile-hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.mobile-hamburger:hover {
  background: var(--bg-hover);
}

.mobile-hamburger:active {
  background: var(--bg-active);
}

.mobile-hamburger svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

/* Hamburger icon lines animation */
.mobile-hamburger .hamburger-icon {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 24px;
  height: 24px;
  gap: 5px;
}

.mobile-hamburger .hamburger-line {
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: all var(--transition-base);
}

/* Animated hamburger to X transform */
.mobile-hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .mobile-hamburger {
    display: flex;
  }
}

/* ===========================================
   SIDEBAR OVERLAY FOR MOBILE
   =========================================== */

.mobile-sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  z-index: calc(var(--z-sticky) - 1);
  opacity: 0;
  transition: opacity var(--transition-base);
  -webkit-tap-highlight-color: transparent;
}

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

/* ===========================================
   BOTTOM NAVIGATION BAR
   Fixed bottom nav for key pages on mobile
   =========================================== */

.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-light);
  z-index: var(--z-sticky);
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.bottom-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100%;
  max-width: 500px;
  margin: 0 auto;
  padding: 0 var(--space-2);
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  flex: 1;
  height: 100%;
  max-width: 80px;
  padding: var(--space-2);
  text-decoration: none;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  position: relative;
}

.bottom-nav-item:hover,
.bottom-nav-item:focus {
  color: var(--text-secondary);
}

.bottom-nav-item.active {
  color: var(--brand-primary);
}

.bottom-nav-item svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.bottom-nav-item span {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  line-height: 1;
  white-space: nowrap;
}

/* Badge on nav item (e.g., unread messages count) */
.bottom-nav-badge {
  position: absolute;
  top: 4px;
  right: calc(50% - 20px);
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: var(--color-error);
  color: white;
  font-size: 10px;
  font-weight: var(--font-bold);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Active indicator dot */
.bottom-nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--brand-primary);
  border-radius: var(--radius-full);
}

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

  /* Add padding to content to account for bottom nav */
  body.has-bottom-nav .content,
  body.has-bottom-nav .main-content > .content {
    padding-bottom: calc(var(--space-6) + 64px + env(safe-area-inset-bottom, 0));
  }

  /* Hide sidebar footer on mobile when bottom nav is visible */
  body.has-bottom-nav .sidebar-footer {
    display: none;
  }
}

/* ===========================================
   RESPONSIVE BREADCRUMB ENHANCEMENTS
   Handles overflow with ellipsis on mobile
   =========================================== */

.topbar-breadcrumb,
.breadcrumb {
  max-width: 100%;
  overflow: hidden;
}

.topbar-breadcrumb a,
.breadcrumb a,
.breadcrumb-link {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 150px;
  display: inline-block;
}

.breadcrumb-current,
.topbar-breadcrumb .current {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

/* Mobile breadcrumb adjustments */
@media (max-width: 768px) {
  .topbar-breadcrumb,
  .breadcrumb {
    max-width: calc(100vw - 140px);
  }

  .topbar-breadcrumb a,
  .breadcrumb a,
  .breadcrumb-link {
    max-width: 80px;
  }

  .breadcrumb-current,
  .topbar-breadcrumb .current {
    max-width: 120px;
  }

  /* Hide middle breadcrumb items on very small screens */
  .topbar-breadcrumb > *:not(:first-child):not(:last-child):not(:nth-last-child(2)),
  .breadcrumb > *:not(:first-child):not(:last-child):not(:nth-last-child(2)) {
    display: none;
  }
}

@media (max-width: 480px) {
  .topbar-breadcrumb a,
  .breadcrumb a,
  .breadcrumb-link {
    max-width: 60px;
  }

  .breadcrumb-current,
  .topbar-breadcrumb .current {
    max-width: 100px;
  }
}

/* ===========================================
   MOBILE BACK BUTTON
   Contextual back navigation for nested pages
   =========================================== */

.mobile-back-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  min-width: 44px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.mobile-back-btn:hover {
  background: var(--bg-hover);
}

.mobile-back-btn:active {
  background: var(--bg-active);
}

.mobile-back-btn svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 768px) {
  /* Show back button on nested/detail pages */
  .page-has-back .mobile-back-btn {
    display: flex;
  }

  /* When back button is shown, hide breadcrumb on mobile */
  .page-has-back .topbar-breadcrumb {
    display: none;
  }

  /* Show compact page title instead */
  .page-has-back .topbar-title {
    font-size: var(--text-base);
    max-width: calc(100vw - 180px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}

/* ===========================================
   MOBILE SIDEBAR BEHAVIOR ENHANCEMENTS
   Slide-in from left on mobile
   =========================================== */

@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

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

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

/* ===========================================
   TOPBAR MOBILE ADJUSTMENTS
   =========================================== */

@media (max-width: 768px) {
  .topbar {
    padding: 0 var(--space-3);
    gap: var(--space-2);
  }

  .topbar-left {
    gap: var(--space-2);
    flex: 1;
    min-width: 0;
  }

  .topbar-right {
    gap: var(--space-1);
    flex-shrink: 0;
  }

  .topbar-title {
    font-size: var(--text-base);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Hide search trigger text on mobile */
  .search-trigger-btn .search-trigger-text,
  .search-trigger-btn kbd {
    display: none;
  }

  .search-trigger-btn {
    width: 44px;
    height: 44px;
    padding: 0;
    justify-content: center;
  }
}

/* ===========================================
   FLOATING ACTION BUTTON (FAB)
   For quick actions on mobile
   =========================================== */

.fab {
  display: none;
  position: fixed;
  bottom: calc(64px + var(--space-4) + env(safe-area-inset-bottom, 0));
  right: var(--space-4);
  width: 56px;
  height: 56px;
  background: var(--brand-primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  z-index: var(--z-sticky);
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  align-items: center;
  justify-content: center;
}

.fab:hover {
  background: var(--brand-primary-dark);
  transform: scale(1.05);
}

.fab:active {
  transform: scale(0.95);
}

.fab svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 768px) {
  .fab {
    display: flex;
  }
}

/* ===========================================
   SWIPE GESTURE VISUAL HINTS
   =========================================== */

.swipe-hint {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 40px;
  background: var(--border-medium);
  border-radius: var(--radius-full);
  opacity: 0.5;
  pointer-events: none;
}

.swipe-hint-left {
  left: 4px;
}

.swipe-hint-right {
  right: 4px;
}

@media (min-width: 769px) {
  .swipe-hint {
    display: none;
  }
}

/* ============================================
   PHASE 13: GLASS MORPHISM (2026 Design Trends)
   Modern frosted glass effects for elevated UI
   ============================================ */

/* Glass Morphism Modal */
.modal,
.modal-content {
  background: rgba(255, 255, 255, 0.85) !important;
  backdrop-filter: blur(12px) !important;
  -webkit-backdrop-filter: blur(12px) !important;
  border: 1px solid rgba(0, 0, 0, 0.08) !important;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25) !important;
}

[data-theme="dark"] .modal,
[data-theme="dark"] .modal-content {
  background: rgba(30, 41, 59, 0.85) !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5) !important;
}

.modal-backdrop {
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* Glass Morphism Dropdown */
.dropdown-menu {
  background: rgba(255, 255, 255, 0.9) !important;
  backdrop-filter: blur(12px) !important;
  -webkit-backdrop-filter: blur(12px) !important;
  border: 1px solid rgba(0, 0, 0, 0.08) !important;
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.2) !important;
}

[data-theme="dark"] .dropdown-menu {
  background: rgba(30, 41, 59, 0.9) !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.4) !important;
}

/* Glass Morphism Toast */
.toast {
  background: rgba(255, 255, 255, 0.9) !important;
  backdrop-filter: blur(12px) !important;
  -webkit-backdrop-filter: blur(12px) !important;
  border: 1px solid rgba(0, 0, 0, 0.08) !important;
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.15) !important;
}

[data-theme="dark"] .toast {
  background: rgba(30, 41, 59, 0.9) !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.4) !important;
}

/* Glass Morphism Sidebar */
.sidebar,
.lms-sidebar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

[data-theme="dark"] .sidebar,
[data-theme="dark"] .lms-sidebar {
  background: rgba(30, 41, 59, 0.95);
}

/* Gradient Mesh Background for Hero Sections */
.gradient-mesh-hero,
.login-hero,
.dashboard-welcome,
.hero-section {
  background:
    radial-gradient(at 40% 20%, rgba(242, 101, 34, 0.15) 0px, transparent 50%),
    radial-gradient(at 80% 0%, rgba(139, 92, 246, 0.1) 0px, transparent 50%),
    radial-gradient(at 0% 50%, rgba(59, 130, 246, 0.1) 0px, transparent 50%),
    radial-gradient(at 80% 50%, rgba(16, 185, 129, 0.08) 0px, transparent 50%),
    radial-gradient(at 0% 100%, rgba(242, 101, 34, 0.1) 0px, transparent 50%),
    var(--bg-secondary);
  background-attachment: fixed;
}

[data-theme="dark"] .gradient-mesh-hero,
[data-theme="dark"] .login-hero,
[data-theme="dark"] .dashboard-welcome,
[data-theme="dark"] .hero-section {
  background:
    radial-gradient(at 40% 20%, rgba(242, 101, 34, 0.2) 0px, transparent 50%),
    radial-gradient(at 80% 0%, rgba(139, 92, 246, 0.15) 0px, transparent 50%),
    radial-gradient(at 0% 50%, rgba(59, 130, 246, 0.12) 0px, transparent 50%),
    radial-gradient(at 80% 50%, rgba(16, 185, 129, 0.1) 0px, transparent 50%),
    radial-gradient(at 0% 100%, rgba(242, 101, 34, 0.15) 0px, transparent 50%),
    var(--bg-secondary);
  background-attachment: fixed;
}

/* Glass Card Variant */
.card-glass {
  background: rgba(255, 255, 255, 0.7) !important;
  backdrop-filter: blur(10px) !important;
  -webkit-backdrop-filter: blur(10px) !important;
  border: 1px solid rgba(0, 0, 0, 0.06) !important;
}

[data-theme="dark"] .card-glass {
  background: rgba(30, 41, 59, 0.7) !important;
  border: 1px solid rgba(255, 255, 255, 0.08) !important;
}

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(12px)) {
  .modal,
  .modal-content,
  .dropdown-menu,
  .toast,
  .sidebar,
  .lms-sidebar,
  .card-glass {
    background: var(--card-bg) !important;
  }
}

/* High Contrast - Disable glass morphism for accessibility */
[data-theme="high-contrast"] .modal,
[data-theme="high-contrast"] .modal-content,
[data-theme="high-contrast"] .dropdown-menu,
[data-theme="high-contrast"] .toast,
[data-theme="high-contrast"] .sidebar,
[data-theme="high-contrast"] .lms-sidebar,
[data-theme="high-contrast"] .card-glass {
  background: #000000 !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}

/* ===========================================
   TABLE SCROLL WRAPPER - Mobile UX
   Responsive horizontal scrolling for data tables
   =========================================== */
.table-scroll-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.table-scroll-wrapper::-webkit-scrollbar {
  height: 8px;
}

.table-scroll-wrapper::-webkit-scrollbar-track {
  background: var(--color-gray-100);
  border-radius: 4px;
}

.table-scroll-wrapper::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: 4px;
}

.table-scroll-wrapper::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

/* Dark mode scrollbar */
[data-theme="dark"] .table-scroll-wrapper::-webkit-scrollbar-track {
  background: var(--color-gray-800);
}

[data-theme="dark"] .table-scroll-wrapper::-webkit-scrollbar-thumb {
  background: var(--color-gray-600);
}

[data-theme="dark"] .table-scroll-wrapper::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

.table-scroll-wrapper .data-table,
.table-scroll-wrapper table {
  border: none;
  border-radius: 0;
  min-width: 600px; /* Ensure table doesn't shrink too much */
}

/* Mobile scroll indicator */
@media (max-width: 768px) {
  .table-scroll-wrapper {
    position: relative;
  }

  .table-scroll-wrapper::after {
    content: '\2190 Scroll \2192';
    display: block;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
  }

  .table-scroll-wrapper:not(:has(:hover))::after {
    opacity: 0.7;
  }

  /* Hide indicator when table fits */
  .table-scroll-wrapper.no-scroll::after {
    display: none;
  }
}

/* ===========================================
   TRIAL BANNER - Subscription Trial Countdown
   Displays trial status and upgrade CTA
   =========================================== */
.trial-banner {
  background: linear-gradient(135deg, var(--color-warning-bg), var(--color-primary-bg));
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  position: relative;
  overflow: hidden;
  animation: trialFadeIn 0.3s ease-out;
}

@keyframes trialFadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.trial-banner::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 100%;
  background: radial-gradient(circle at right, rgba(242, 101, 34, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.trial-banner-content {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 1400px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.trial-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  animation: trialPulse 2s ease-in-out infinite;
}

@keyframes trialPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

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

.trial-info strong {
  display: block;
  color: var(--text-primary);
  font-size: 0.9375rem;
  font-weight: 600;
}

.trial-info p {
  margin: 0.125rem 0 0;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.trial-days {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-500);
  color: white;
  font-weight: 700;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  margin: 0 0.25rem;
}

.trial-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.trial-actions .btn-primary {
  font-size: 0.8125rem;
  padding: 0.5rem 1rem;
  font-weight: 600;
  white-space: nowrap;
}

.trial-dismiss {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.trial-dismiss:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.trial-dismiss:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

.trial-dismiss svg {
  width: 16px;
  height: 16px;
}

.trial-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(0, 0, 0, 0.1);
}

.trial-progress-bar {
  height: 100%;
  background: var(--color-primary-500);
  transition: width 0.5s ease;
  border-radius: 0 2px 2px 0;
}

/* Urgent state (3 days or less) */
.trial-banner.urgent {
  background: linear-gradient(135deg, var(--color-error-bg), var(--color-warning-bg));
  animation: trialFadeIn 0.3s ease-out, trialUrgentPulse 2s ease-in-out infinite;
}

@keyframes trialUrgentPulse {
  0%, 100% {
    box-shadow: inset 0 0 0 1px rgba(239, 68, 68, 0.2);
  }
  50% {
    box-shadow: inset 0 0 0 2px rgba(239, 68, 68, 0.4);
  }
}

.trial-banner.urgent .trial-days {
  background: var(--color-error-500);
  animation: urgentDaysPulse 1s ease-in-out infinite;
}

@keyframes urgentDaysPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.trial-banner.urgent .trial-progress-bar {
  background: var(--color-error-500);
}

/* Last day - extra urgent */
.trial-banner.urgent.last-day .trial-info strong {
  color: var(--color-error-500);
}

/* Dark theme adjustments */
[data-theme="dark"] .trial-banner {
  background: linear-gradient(135deg,
    rgba(245, 158, 11, 0.15),
    rgba(242, 101, 34, 0.1)
  );
}

[data-theme="dark"] .trial-banner.urgent {
  background: linear-gradient(135deg,
    rgba(239, 68, 68, 0.15),
    rgba(245, 158, 11, 0.1)
  );
}

[data-theme="dark"] .trial-progress {
  background: rgba(255, 255, 255, 0.1);
}

/* Mobile responsive */
@media (max-width: 640px) {
  .trial-banner {
    padding: 0.625rem 0.75rem;
  }

  .trial-banner-content {
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .trial-icon {
    font-size: 1.25rem;
  }

  .trial-info {
    flex: 1 1 calc(100% - 3rem);
    order: 1;
  }

  .trial-info strong {
    font-size: 0.875rem;
  }

  .trial-info p {
    font-size: 0.75rem;
  }

  .trial-actions {
    order: 2;
    width: 100%;
    justify-content: space-between;
  }

  .trial-actions .btn-primary {
    flex: 1;
    text-align: center;
  }

  .trial-dismiss {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
  }
}

/* ============================================
   COOKIE CONSENT BANNER & MODAL
   GDPR/CCPA Compliant Cookie Consent UI
   ============================================ */

/* Cookie Banner - Fixed at bottom */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--card-bg);
  border-top: 1px solid var(--card-border);
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.15);
  z-index: var(--z-max);
  padding: var(--space-5) var(--space-6);
  transform: translateY(100%);
  transition: transform var(--transition-slow);
}

.cookie-banner.visible {
  transform: translateY(0);
}

.cookie-banner.hiding {
  transform: translateY(100%);
}

.cookie-banner-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.cookie-banner-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--color-primary-bg);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-primary);
}

.cookie-banner-icon svg {
  width: 28px;
  height: 28px;
}

.cookie-banner-content {
  flex: 1;
  min-width: 280px;
}

.cookie-banner-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.cookie-banner-text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-3);
}

.cookie-banner-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
}

.cookie-banner-links a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.cookie-banner-links a:hover {
  color: var(--brand-primary);
}

.cookie-link-sep {
  color: var(--text-muted);
}

.cookie-banner-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: center;
}

/* Cookie Buttons */
.cookie-btn {
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-lg);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  white-space: nowrap;
}

.cookie-btn-primary {
  background: var(--brand-primary);
  color: white;
}

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

.cookie-btn-primary:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

.cookie-btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-medium);
}

.cookie-btn-outline:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.cookie-btn-outline:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

/* Cookie Preferences Modal */
.cookie-modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--color-surface-overlay-dark);
  z-index: var(--z-max);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.cookie-modal-backdrop[hidden] {
  display: none;
}

.cookie-modal-backdrop.open {
  opacity: 1;
}

.cookie-modal {
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 560px;
  width: 100%;
  max-height: 85vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-base);
}

.cookie-modal-backdrop.open .cookie-modal {
  transform: scale(1) translateY(0);
}

.cookie-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--card-border);
}

.cookie-modal-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin: 0;
}

.cookie-modal-close {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

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

.cookie-modal-close:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

.cookie-modal-close svg {
  width: 20px;
  height: 20px;
}

.cookie-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
}

.cookie-modal-intro {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-5);
}

.cookie-modal-intro a {
  color: var(--brand-primary);
}

.cookie-pref-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.cookie-pref-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.cookie-pref-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.cookie-pref-toggle {
  flex-shrink: 0;
}

/* Cookie Toggle Switch */
.cookie-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
  cursor: pointer;
}

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

.cookie-switch-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--bg-hover);
  transition: var(--transition-base);
  border-radius: 26px;
}

.cookie-switch-slider::before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: var(--transition-base);
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

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

.cookie-switch input:checked + .cookie-switch-slider::before {
  transform: translateX(22px);
}

.cookie-switch input:disabled + .cookie-switch-slider {
  opacity: 0.6;
  cursor: not-allowed;
}

.cookie-switch input:focus-visible + .cookie-switch-slider {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

.cookie-pref-info {
  flex: 1;
}

.cookie-pref-title {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.cookie-pref-required {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  background: var(--color-info-bg);
  color: var(--color-info-500);
  border-radius: var(--radius-full);
}

.cookie-pref-expand {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.cookie-pref-expand:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.cookie-pref-expand:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

.cookie-pref-expand svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-fast);
}

.cookie-pref-expand.expanded svg {
  transform: rotate(180deg);
}

.cookie-pref-desc {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  line-height: var(--leading-normal);
  margin-top: var(--space-2);
  margin-bottom: 0;
}

.cookie-pref-details {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-light);
}

.cookie-pref-examples {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin: 0;
}

.cookie-modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--card-border);
  display: flex;
  justify-content: flex-end;
}

/* Cookie Settings Footer Link */
.cookie-settings-link {
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.cookie-settings-link:hover {
  color: var(--brand-primary);
}

/* Responsive Cookie Consent */
@media (max-width: 768px) {
  .cookie-banner {
    padding: var(--space-4);
  }

  .cookie-banner-container {
    flex-direction: column;
    gap: var(--space-4);
  }

  .cookie-banner-icon {
    display: none;
  }

  .cookie-banner-content {
    min-width: auto;
  }

  .cookie-banner-actions {
    width: 100%;
    flex-direction: column;
  }

  .cookie-btn {
    width: 100%;
    justify-content: center;
  }

  .cookie-modal {
    max-height: 95vh;
  }

  .cookie-modal-header {
    padding: var(--space-4);
  }

  .cookie-modal-body {
    padding: var(--space-4);
  }

  .cookie-modal-footer {
    padding: var(--space-4);
  }

  .cookie-modal-footer .cookie-btn {
    width: 100%;
  }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  .cookie-banner,
  .cookie-modal-backdrop,
  .cookie-modal,
  .cookie-switch-slider,
  .cookie-switch-slider::before,
  .cookie-pref-expand svg {
    transition: none;
  }
}

/* Print - hide cookie UI */
@media print {
  .cookie-banner,
  .cookie-modal-backdrop {
    display: none !important;
  }
}