/* ================================================================
   L GROUP Academy — Design System v2.0
   "Calm Confidence" — Professional Corporate LMS
   ================================================================ */

/* === DESIGN TOKENS === */

:root {
  /* --- Primary (Indigo) --- */
  --color-primary-50:  #EEF2FF;
  --color-primary-100: #E0E7FF;
  --color-primary-200: #C7D2FE;
  --color-primary-300: #A5B4FC;
  --color-primary-400: #818CF8;
  --color-primary-500: #4F46E5;
  --color-primary-600: #4338CA;
  --color-primary-700: #3730A3;

  /* --- Accent (Warm Orange — CTA only) --- */
  --color-accent-50:  #FFF7ED;
  --color-accent-100: #FFEDD5;
  --color-accent-400: #FB923C;
  --color-accent-500: #F97316;
  --color-accent-600: #EA580C;

  /* --- Success --- */
  --color-success-50:  #F0FDF4;
  --color-success-100: #DCFCE7;
  --color-success-500: #16A34A;
  --color-success-600: #15803D;
  --color-success-700: #15803D;

  /* --- Warning --- */
  --color-warning-50:  #FFFBEB;
  --color-warning-100: #FEF3C7;
  --color-warning-500: #F59E0B;
  --color-warning-600: #D97706;

  /* --- Error --- */
  --color-error-50:  #FEF2F2;
  --color-error-100: #FEE2E2;
  --color-error-500: #EF4444;
  --color-error-600: #DC2626;
  --color-error-700: #B91C1C;

  /* --- Info --- */
  --color-info-50:  #EFF6FF;
  --color-info-100: #DBEAFE;
  --color-info-500: #3B82F6;
  --color-info-600: #2563EB;

  /* --- Neutrals (Slate) --- */
  --color-neutral-0:   #FFFFFF;
  --color-neutral-50:  #F8FAFC;
  --color-neutral-100: #F1F5F9;
  --color-neutral-200: #E2E8F0;
  --color-neutral-300: #CBD5E1;
  --color-neutral-400: #94A3B8;
  --color-neutral-500: #64748B;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1E293B;
  --color-neutral-900: #0F172A;

  /* --- Semantic Aliases --- */
  --bg-primary:    var(--color-neutral-50);
  --bg-secondary:  var(--color-neutral-100);
  --bg-surface:    var(--color-neutral-0);
  --bg-page:       var(--color-neutral-50);
  --text-primary:  var(--color-neutral-900);
  --text-secondary: var(--color-neutral-500);
  --text-muted:    var(--color-neutral-500);
  --border-color:  var(--color-neutral-200);
  --border-strong: var(--color-neutral-300);

  /* --- Backward Compat (old names → new values) --- */
  --color-primary:    var(--color-primary-500);
  --color-success:    var(--color-success-500);
  --color-info:       var(--color-info-500);
  --color-white:      #FFFFFF;
  --color-bg:         var(--color-neutral-50);
  --color-text:       var(--color-neutral-900);
  --color-text-muted: var(--color-neutral-500);
  --color-border:     var(--color-neutral-200);

  /* --- Typography --- */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-family: var(--font-sans);

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;

  /* --- Spacing --- */
  --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;

  /* --- Border Radius --- */
  --radius-sm:   6px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  24px;
  --radius-full: 9999px;
  --border-radius:    var(--radius-lg);
  --border-radius-lg: var(--radius-xl);

  /* --- Shadows --- */
  --shadow-xs:     0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm:     0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md:     0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg:     0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl:     0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-2xl:    0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-primary: 0 4px 14px rgba(99, 102, 241, 0.25);
  --shadow-soft:   var(--shadow-xs);
  --shadow-medium: var(--shadow-md);

  /* --- Gradients --- */
  --gradient-hero:         linear-gradient(135deg, #1E1B4B 0%, #312E81 50%, #4338CA 100%);
  --gradient-primary-soft: linear-gradient(135deg, #EEF2FF 0%, #F5F3FF 100%);
  --gradient-accent:       linear-gradient(135deg, #F97316 0%, #FB923C 100%);
  --gradient-success:      linear-gradient(135deg, #22C55E 0%, #4ADE80 100%);

  /* --- Layout --- */
  --sidebar-width:  260px;
  --header-height:  64px;
  --content-max:    1280px;
  --lesson-max:     800px;
  --color-shadow:   rgba(0, 0, 0, 0.08);

  /* --- Z-Index --- */
  --z-dropdown: 10;
  --z-sticky:   20;
  --z-overlay:  30;
  --z-modal:    40;
  --z-toast:    50;

  /* --- Transitions --- */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}


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

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


/* === TYPOGRAPHY === */

h1 {
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

h4 {
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-3);
  color: var(--text-secondary);
  line-height: 1.6;
}

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

a:hover {
  color: var(--color-primary-700);
}

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

/* Lesson content typography */
.lesson-content {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--text-primary);
  max-width: 72ch;
}

.lesson-content h2 {
  font-size: var(--text-2xl);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
}

.lesson-content h3 {
  font-size: var(--text-xl);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.lesson-content p {
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.lesson-content ul,
.lesson-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.lesson-content li {
  margin-bottom: var(--space-2);
  line-height: 1.7;
}

.lesson-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--space-6) 0;
}

.lesson-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* Overline label */
.text-overline {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}


/* === CARDS === */

.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-sm);
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-200);
  transform: translateY(-2px);
}

.card-featured {
  background: var(--gradient-primary-soft);
  border-color: var(--color-primary-200);
}

.card-accent-left {
  border-left: 3px solid var(--color-primary-500);
}

.card-accent-left--success { border-left-color: var(--color-success-500); }
.card-accent-left--warning { border-left-color: var(--color-warning-500); }
.card-accent-left--error   { border-left-color: var(--color-error-500); }
.card-accent-left--info    { border-left-color: var(--color-info-500); }

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

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

/* Stat card */
.card-stat {
  padding: var(--space-5);
  position: relative;
  overflow: hidden;
}

.card-stat:has(.help-trigger) {
  overflow: visible;
}

.card-stat:has(.help-trigger)::after {
  clip-path: inset(0 0 0 0 round var(--radius-lg));
}

.card-stat::after {
  content: '';
  position: absolute;
  right: -16px;
  bottom: -16px;
  width: 72px;
  height: 72px;
  border-radius: var(--radius-full);
  background: var(--color-primary-50);
  opacity: 0.6;
}

.card-stat-value {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: var(--space-1);
  font-variant-numeric: tabular-nums;
}

.card-stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.card-stat-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: var(--space-3);
}

.card-stat-icon--primary { background: var(--color-primary-50); color: var(--color-primary-500); }
.card-stat-icon--success { background: var(--color-success-50); color: var(--color-success-600); }
.card-stat-icon--warning { background: var(--color-warning-50); color: var(--color-warning-600); }
.card-stat-icon--error   { background: var(--color-error-50);   color: var(--color-error-500); }
.card-stat-icon--info    { background: var(--color-info-50);    color: var(--color-info-500); }


/* === BUTTONS === */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 40px;
  padding: 0 var(--space-4);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: var(--text-sm);
  line-height: 1;
  letter-spacing: 0.01em;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* Primary */
.btn-primary {
  background-color: var(--color-primary-500);
  color: white;
  border-color: var(--color-primary-500);
}

.btn-primary:hover {
  background-color: var(--color-primary-600);
  box-shadow: var(--shadow-primary);
}

.btn-primary:active {
  background-color: var(--color-primary-700);
}

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

.btn-secondary:hover {
  background-color: var(--color-neutral-50);
  border-color: var(--border-strong);
}

.btn-secondary:active {
  background-color: var(--color-neutral-100);
}

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

.btn-ghost:hover {
  background: var(--color-neutral-100);
  color: var(--text-primary);
}

/* Success */
.btn-success {
  background-color: var(--color-success-500);
  color: white;
  border-color: var(--color-success-500);
}

.btn-success:hover {
  background-color: var(--color-success-600);
  box-shadow: 0 4px 14px rgba(34, 197, 94, 0.25);
}

/* Info */
.btn-info {
  background-color: var(--color-info-500);
  color: white;
  border-color: var(--color-info-500);
}

.btn-info:hover {
  background-color: var(--color-info-600);
}

/* Danger */
.btn-danger {
  background-color: var(--color-error-500);
  color: white;
  border-color: var(--color-error-500);
}

.btn-danger:hover {
  background-color: var(--color-error-600);
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.25);
}

/* Accent CTA (use sparingly) */
.btn-accent {
  background: var(--gradient-accent);
  color: white;
  border-color: var(--color-accent-500);
}

.btn-accent:hover {
  box-shadow: 0 4px 14px rgba(249, 115, 22, 0.3);
}

/* Sizes */
.btn-sm {
  height: 32px;
  padding: 0 var(--space-3);
  font-size: var(--text-xs);
}

.btn-lg {
  height: 48px;
  padding: 0 var(--space-6);
  font-size: var(--text-base);
}

.btn-icon {
  width: 40px;
  padding: 0;
}

.btn-icon.btn-sm { width: 32px; }
.btn-icon.btn-lg { width: 48px; }


/* === FORMS === */

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

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  height: 40px;
  padding: 0 var(--space-3);
  font-size: var(--text-sm);
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:hover {
  border-color: var(--border-strong);
}

.form-control:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.form-control::placeholder {
  color: var(--color-neutral-400);
}

.form-control.error {
  border-color: var(--color-error-500);
}

.form-control.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12);
}

textarea.form-control {
  height: auto;
  min-height: 120px;
  padding: var(--space-3);
  resize: vertical;
  line-height: 1.5;
}

.form-error {
  color: var(--color-error-500);
  font-size: var(--text-xs);
  margin-top: var(--space-1);
}

.form-helper {
  color: var(--text-muted);
  font-size: var(--text-xs);
  margin-top: var(--space-1);
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  min-height: 44px;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-primary-500);
}


/* === NAVBAR === */

.navbar {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0 var(--space-6);
  height: var(--header-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-xs);
}

.navbar-brand {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.navbar-brand:hover {
  color: var(--color-primary-500);
}

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

.navbar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.navbar-user-name {
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.navbar-user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-400));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: var(--text-sm);
}

/* === NAVBAR SEARCH === */
.navbar-search {
  position: relative;
  flex: 0 1 320px;
  min-width: 0;
}
.navbar-search-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
}
.navbar-search-toggle:hover {
  background: var(--color-bg);
  color: var(--text-primary);
}
.navbar-search-field {
  position: relative;
  display: flex;
  align-items: center;
}
.navbar-search-icon {
  position: absolute;
  left: 12px;
  color: var(--text-muted);
  pointer-events: none;
}
.navbar-search-input {
  width: 100%;
  height: 38px;
  padding: 0 36px 0 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.navbar-search-input:focus {
  outline: none;
  border-color: var(--color-primary-500);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}
.navbar-search-input::placeholder {
  color: var(--text-muted);
}
.navbar-search-close {
  position: absolute;
  right: 6px;
  background: transparent;
  border: none;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
}
.navbar-search-close:hover {
  background: var(--color-border);
  color: var(--text-primary);
}
.navbar-search-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
  max-height: 420px;
  overflow-y: auto;
  z-index: 200;
  display: none;
}
.navbar-search-dropdown.open { display: block; }
.navbar-search-empty {
  padding: 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: var(--text-sm);
}
.navbar-search-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid var(--color-border);
  transition: background 0.1s;
}
.navbar-search-item:last-child { border-bottom: none; }
.navbar-search-item:hover,
.navbar-search-item.active {
  background: var(--color-bg);
}
.navbar-search-thumb {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.navbar-search-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.navbar-search-thumb-fallback {
  color: var(--text-muted);
}
.navbar-search-text {
  flex: 1;
  min-width: 0;
}
.navbar-search-name {
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.navbar-search-name mark {
  background: rgba(79, 70, 229, 0.18);
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
}
.navbar-search-meta {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}


/* === TABLES === */

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table thead {
  background-color: var(--color-neutral-50);
}

.table th {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: 600;
  font-size: var(--text-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
}

.table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-neutral-100);
  color: var(--text-primary);
}

.table tbody tr {
  transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
  background-color: var(--color-neutral-50);
}

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


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

.progress {
  height: 6px;
  background-color: var(--color-neutral-100);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-2);
}

.progress-lg {
  height: 10px;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-primary-400));
  border-radius: var(--radius-full);
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

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

.progress-bar.danger {
  background: linear-gradient(90deg, var(--color-error-500), var(--color-error-600));
}

.progress-bar.warning {
  background: linear-gradient(90deg, var(--color-warning-500), var(--color-warning-600));
}

.progress-text {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  font-weight: 500;
}

/* Shimmer animation for active progress */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.progress-bar.active {
  background-size: 200% 100%;
  animation: shimmer 2s linear infinite;
  background-image: linear-gradient(
    90deg,
    var(--color-primary-500) 0%,
    var(--color-primary-300) 50%,
    var(--color-primary-500) 100%
  );
}


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

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
  line-height: 1.4;
}

.badge-primary {
  background-color: var(--color-primary-50);
  color: var(--color-primary-700);
}

.badge-success {
  background-color: var(--color-success-50);
  color: var(--color-success-700);
}

.badge-info {
  background-color: var(--color-info-50);
  color: var(--color-info-600);
}

.badge-warning {
  background-color: var(--color-warning-50);
  color: var(--color-warning-600);
}

.badge-danger {
  background-color: var(--color-error-50);
  color: var(--color-error-700);
}

.badge-muted {
  background-color: var(--color-neutral-100);
  color: var(--color-neutral-600);
}

/* Pill badge */
.badge-pill {
  border-radius: var(--radius-full);
  padding: 0.25rem 0.75rem;
}


/* === HELP TOOLTIP === */

.help-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  background: var(--color-neutral-100);
  color: var(--color-neutral-500);
  font-size: 12px;
  font-weight: 700;
  cursor: help;
  position: relative;
  vertical-align: middle;
  margin-left: 6px;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.help-trigger:hover {
  background: var(--color-primary-100);
  color: var(--color-primary-600);
}

.help-popover {
  display: none;
  position: fixed;
  z-index: 10000;
  width: 320px;
  max-width: calc(100vw - 32px);
  padding: var(--space-4);
  background: var(--color-neutral-900);
  color: var(--color-neutral-100);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 400;
  line-height: 1.6;
  box-shadow: var(--shadow-xl);
  pointer-events: none;
}

.help-popover::after {
  content: '';
  position: absolute;
  top: 100%;
  left: var(--arrow-left, 50%);
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--color-neutral-900);
}

.help-popover.show {
  display: block;
  pointer-events: auto;
}

.help-popover-title {
  font-weight: 600;
  color: #fff;
  margin-bottom: 6px;
  font-size: var(--text-sm);
}

.help-popover p {
  margin: 0 0 8px;
  color: var(--color-neutral-300);
}

.help-popover p:last-child {
  margin-bottom: 0;
}

.help-popover ul {
  margin: 4px 0 8px;
  padding-left: 16px;
  color: var(--color-neutral-300);
}

.help-popover ul li {
  margin-bottom: 4px;
}

.help-popover code {
  background: rgba(255,255,255,0.1);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.85em;
}

.help-popover--down::after {
  top: auto;
  bottom: 100%;
  border: 6px solid transparent;
  border-bottom-color: var(--color-neutral-900);
  border-top-color: transparent;
}


/* === ALERTS === */

.alert {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  border-left: 4px solid;
  font-size: var(--text-sm);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.alert-danger {
  background-color: var(--color-error-50);
  color: var(--color-error-700);
  border-color: var(--color-error-500);
}

.alert-success {
  background-color: var(--color-success-50);
  color: var(--color-success-700);
  border-color: var(--color-success-500);
}

.alert-info {
  background-color: var(--color-info-50);
  color: var(--color-info-600);
  border-color: var(--color-info-500);
}

.alert-warning {
  background-color: var(--color-warning-50);
  color: var(--color-warning-600);
  border-color: var(--color-warning-500);
}


/* === MODALS === */

.modal {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.5);
  z-index: var(--z-modal);
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal.show {
  display: flex;
}

.modal-content {
  background-color: var(--bg-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 90%;
  padding: var(--space-8);
  animation: modalIn var(--transition-base) ease-out;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-size: var(--text-xl);
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--color-neutral-100);
}

.modal-body {
  margin-bottom: var(--space-6);
}

.modal-footer {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
}


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

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-neutral-200);
  border-top-color: var(--color-primary-500);
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
}

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

.loading-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

/* Skeleton loader */
.skeleton {
  background: linear-gradient(90deg,
    var(--color-neutral-100) 25%,
    var(--color-neutral-50) 50%,
    var(--color-neutral-100) 75%
  );
  background-size: 200% 100%;
  animation: skeletonPulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

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

.skeleton-text {
  height: 14px;
  margin-bottom: var(--space-2);
  width: 100%;
}

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-title {
  height: 24px;
  width: 40%;
  margin-bottom: var(--space-4);
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
}

.skeleton-card {
  height: 120px;
  width: 100%;
}


/* === TOAST NOTIFICATIONS === */

.toast-container {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  min-width: 300px;
  max-width: 420px;
  animation: toastIn var(--transition-slow) ease-out;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast-success { border-left: 3px solid var(--color-success-500); }
.toast-error   { border-left: 3px solid var(--color-error-500); }
.toast-warning { border-left: 3px solid var(--color-warning-500); }
.toast-info    { border-left: 3px solid var(--color-info-500); }

.toast-close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-1);
  font-size: 1rem;
  line-height: 1;
}


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

.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.4;
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.empty-state-text {
  font-size: var(--text-sm);
  color: var(--text-muted);
  max-width: 360px;
  margin: 0 auto;
}


/* === GRID & LAYOUT === */

.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: var(--lesson-max);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.col { flex: 1 1 auto; min-width: 0; }
.col-12 { flex-basis: 100%; }
.col-6  { flex-basis: calc(50% - var(--space-3)); }
.col-4  { flex-basis: calc(33.333% - var(--space-4)); }
.col-3  { flex-basis: calc(25% - calc(var(--space-6) * 0.75)); }

.gap-1 { gap: var(--space-2); }
.gap-2 { gap: var(--space-4); }
.gap-3 { gap: var(--space-6); }
.gap-4 { gap: var(--space-8); }

.d-flex { display: flex; }
.d-grid { display: grid; }
.flex-col { flex-direction: column; }
.justify-between { justify-content: space-between; }
.justify-center  { justify-content: center; }
.align-center { align-items: center; }
.align-start  { align-items: flex-start; }
.align-end    { align-items: flex-end; }
.flex-wrap { flex-wrap: wrap; }

.mt-1 { margin-top: var(--space-2); }
.mt-2 { margin-top: var(--space-4); }
.mt-3 { margin-top: var(--space-6); }
.mt-4 { margin-top: var(--space-8); }

.mb-1 { margin-bottom: var(--space-2); }
.mb-2 { margin-bottom: var(--space-4); }
.mb-3 { margin-bottom: var(--space-6); }
.mb-4 { margin-bottom: var(--space-8); }

.px-1 { padding-left: var(--space-2);  padding-right: var(--space-2); }
.px-2 { padding-left: var(--space-4);  padding-right: var(--space-4); }
.px-3 { padding-left: var(--space-6);  padding-right: var(--space-6); }

.py-1 { padding-top: var(--space-2);  padding-bottom: var(--space-2); }
.py-2 { padding-top: var(--space-4);  padding-bottom: var(--space-4); }
.py-3 { padding-top: var(--space-6);  padding-bottom: var(--space-6); }

.text-center  { text-align: center; }
.text-right   { text-align: right; }
.text-muted   { color: var(--text-muted); }
.text-danger  { color: var(--color-error-500); }
.text-success { color: var(--color-success-600); }
.text-info    { color: var(--color-info-500); }
.text-primary { color: var(--color-primary-500); }

.font-bold     { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium   { font-weight: 500; }

.text-sm { font-size: var(--text-sm); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-2xl); }

.w-full { width: 100%; }
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}


/* === RESPONSIVE === */

@media (max-width: 768px) {
  .navbar {
    padding: 0 var(--space-4);
    height: 56px;
  }

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

  .navbar-user-name {
    display: none;
  }

  .navbar .btn-ghost.btn-sm {
    font-size: 0;
    padding: var(--space-2);
    min-width: 36px;
  }

  .navbar .btn-ghost.btn-sm::before {
    content: "\2699";
    font-size: var(--text-lg);
  }

  /* Mobile: navbar search collapses to icon, expands to fullscreen overlay */
  .navbar-search {
    flex: 0 0 auto;
  }
  .navbar-search-toggle { display: inline-flex; }
  .navbar-search-field { display: none; }
  .navbar-search.expanded .navbar-search-toggle { display: none; }
  .navbar-search.expanded .navbar-search-field {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 300;
    padding: 10px var(--space-4);
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  }
  .navbar-search.expanded .navbar-search-close { display: inline-flex; }
  .navbar-search.expanded .navbar-search-dropdown {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    border-radius: 0;
    border-left: none;
    border-right: none;
    max-height: calc(100vh - 60px);
  }

  .container {
    padding: 0 var(--space-4);
  }

  h1 { font-size: var(--text-2xl); }
  h2 { font-size: var(--text-xl); }

  .col-6,
  .col-4,
  .col-3 {
    flex-basis: 100%;
  }

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

  .modal-content {
    width: 95%;
    padding: var(--space-6);
    margin: var(--space-4);
  }

  .table th,
  .table td {
    padding: var(--space-2) var(--space-3);
  }

  .row {
    gap: var(--space-4);
  }

  .toast {
    min-width: unset;
    max-width: calc(100vw - var(--space-8));
  }

  .toast-container {
    left: var(--space-4);
  }
}

@media (max-width: 480px) {
  .navbar-brand {
    font-size: var(--text-base);
  }

  .navbar-brand img {
    display: none;
  }

  .navbar .btn-secondary.btn-sm {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-2);
  }

  .card {
    padding: var(--space-3);
    border-radius: var(--radius-md);
  }

  .btn {
    width: 100%;
  }

  .btn-sm {
    width: auto;
  }
}


/* === REDUCED MOTION === */

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


/* === PRINT === */

@media print {
  .navbar,
  .btn,
  .modal,
  .toast-container {
    display: none !important;
  }

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

  body {
    background: white;
  }
}