/* ============================================================================
   TejasLearn - Complete Design System & Styles
   From Zero to Pro in 30 Days
   ============================================================================ */

/* ============================================================================
   1. CSS CUSTOM PROPERTIES (Variables)
   ============================================================================ */

:root {
  /* ──────────────────────────────────────────
     TejasLearn Brand Palette
     #6610F2  Primary (Violet)
     #1A8FE3  Secondary (Blue)
     #D11149  Danger / accent red
     #F37933  Warm orange (streak, fire)
     #E6C229  Gold (XP, achievements)
     ────────────────────────────────────────── */

  /* Colors - Primary Palette */
  --color-primary: #6610F2;
  --color-primary-dark: #5209CC;
  --color-primary-light: #8B4DFF;

  /* Colors - Secondary Palette */
  --color-secondary: #1A8FE3;
  --color-secondary-dark: #1575C0;
  --color-secondary-light: #42A8FF;

  /* Colors - Accent */
  --color-accent: #E6C229;
  --color-accent-dark: #C9A820;
  --color-accent-warm: #F37933;

  /* Colors - Semantic */
  --color-success: #00E676;
  --color-warning: #F37933;
  --color-error: #D11149;
  --color-error-dark: #A80E3A;
  --color-info: #1A8FE3;

  /* Colors - Background */
  --color-bg-dark: #0B0B1A;
  --color-bg-darker: #06060F;
  --color-card: #12122A;
  --color-surface: #1A1A35;
  --color-surface-light: #232340;

  /* Colors - Text */
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #A0A0C0;
  --color-text-tertiary: #7A7A95;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6610F2 0%, #1A8FE3 100%);
  --gradient-warm:    linear-gradient(135deg, #D11149 0%, #F37933 100%);
  --gradient-gold:    linear-gradient(135deg, #F37933 0%, #E6C229 100%);
  --gradient-cool:    linear-gradient(135deg, #1A8FE3 0%, #6610F2 100%);

  /* Shadows (updated to new primary) */
  --shadow-sm: 0 2px 8px rgba(102, 16, 242, 0.12);
  --shadow-md: 0 4px 16px rgba(102, 16, 242, 0.16);
  --shadow-lg: 0 8px 32px rgba(102, 16, 242, 0.18);
  --shadow-xl: 0 12px 48px rgba(102, 16, 242, 0.22);

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 50px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(102, 16, 242, 0.1);
  --shadow-md: 0 4px 16px rgba(102, 16, 242, 0.15);
  --shadow-lg: 0 8px 32px rgba(102, 16, 242, 0.15);
  --shadow-xl: 0 12px 48px rgba(102, 16, 242, 0.2);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;
  --font-size-4xl: 48px;

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

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-toast: 600;
  --z-tooltip: 700;
}

/* ============================================================================
   2. RESET & NORMALIZE
   ============================================================================ */

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-dark);
  overflow-x: hidden;
}

/* ============================================================================
   3. TYPOGRAPHY
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

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

a:hover {
  color: var(--color-secondary-light);
}

code {
  font-family: 'Courier New', monospace;
  background-color: var(--color-surface);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

pre {
  background-color: var(--color-surface);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

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

/* ============================================================================
   4. BUTTONS
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 12px 48px rgba(102, 16, 242, 0.3);
}

/* Secondary Button */
.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-secondary);
  border: 2px solid var(--color-secondary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: rgba(26, 143, 227, 0.1);
}

/* Ghost Button */
.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-surface-light);
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-surface);
  border-color: var(--color-secondary);
  color: var(--color-secondary);
}

/* Danger Button */
.btn-danger {
  background-color: var(--color-error);
  color: var(--color-text-primary);
}

.btn-danger:hover:not(:disabled) {
  background-color: var(--color-error-dark);
  box-shadow: var(--shadow-lg);
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

/* Button Full Width */
.btn-block {
  width: 100%;
}

/* ============================================================================
   5. FORM ELEMENTS
   ============================================================================ */

.form-group {
  margin-bottom: var(--spacing-lg);
}

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

input,
textarea,
select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  background-color: var(--color-surface);
  border: 2px solid var(--color-surface-light);
  border-radius: var(--radius-lg);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

input::placeholder,
textarea::placeholder {
  color: var(--color-text-tertiary);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(102, 16, 242, 0.1);
  background-color: var(--color-surface-light);
}

textarea {
  resize: vertical;
  min-height: 100px;
  font-family: 'Courier New', monospace;
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2300D4FF' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-md) center;
  padding-right: var(--spacing-2xl);
}

/* Checkbox & Radio */
.checkbox,
.radio {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  user-select: none;
  margin-bottom: var(--spacing-md);
}

.checkbox input,
.radio input {
  width: auto;
  margin: 0;
  cursor: pointer;
  accent-color: var(--color-primary);
}

.checkbox label,
.radio label {
  margin: 0;
  cursor: pointer;
  font-weight: var(--font-weight-normal);
}

/* Form Error */
.form-error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

.form-group.error input,
.form-group.error textarea {
  border-color: var(--color-error);
}

/* ============================================================================
   6. CARDS
   ============================================================================ */

.card {
  background-color: var(--color-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  border: 1px solid rgba(102, 16, 242, 0.1);
  transition: all var(--transition-normal);
}

.card:hover {
  border-color: rgba(102, 16, 242, 0.3);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

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

.card-body {
  color: var(--color-text-secondary);
}

.card-footer {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-surface-light);
}

/* ============================================================================
   7. MODAL & OVERLAY
   ============================================================================ */

.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(10, 10, 26, 0.8);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  animation: fadeIn var(--transition-normal);
}

.modal-overlay.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(102, 16, 242, 0.2);
  box-shadow: var(--shadow-xl);
  animation: slideUp var(--transition-normal);
  z-index: var(--z-modal);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-surface-light);
  flex-shrink: 0;
}

.modal-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
}

.modal-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-2xl);
  cursor: pointer;
  transition: color var(--transition-fast);
}

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

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-surface-light);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

/* ============================================================================
   8. NAVIGATION
   ============================================================================ */

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-surface);
  border-bottom: 1px solid rgba(102, 16, 242, 0.1);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.navbar-brand {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-2xl);
}

.navbar-item {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
  cursor: pointer;
}

.navbar-item:hover,
.navbar-item.active {
  color: var(--color-secondary);
}

/* Sidebar */
.sidebar {
  width: 280px;
  background-color: var(--color-surface);
  border-right: 1px solid rgba(102, 16, 242, 0.1);
  padding: var(--spacing-lg) 0;
  position: fixed;
  left: 0;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: var(--z-fixed);
}

.sidebar-item {
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.sidebar-item:hover {
  background-color: rgba(102, 16, 242, 0.1);
  color: var(--color-secondary);
}

.sidebar-item.active {
  border-left-color: var(--color-primary);
  background-color: rgba(102, 16, 242, 0.1);
  color: var(--color-secondary);
}

.sidebar-section-title {
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-sm);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ============================================================================
   9. BADGES & CHIPS
   ============================================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  background-color: var(--color-surface);
  border: 1px solid rgba(102, 16, 242, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
}

.badge-primary {
  background: var(--gradient-primary);
  border: none;
  color: var(--color-text-primary);
}

.badge-success {
  background-color: rgba(0, 230, 118, 0.1);
  color: var(--color-success);
  border-color: var(--color-success);
}

.badge-warning {
  background-color: rgba(255, 193, 7, 0.1);
  color: var(--color-warning);
  border-color: var(--color-warning);
}

.badge-error {
  background-color: rgba(255, 68, 68, 0.1);
  color: var(--color-error);
  border-color: var(--color-error);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-surface-light);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chip:hover {
  border-color: var(--color-secondary);
  background-color: rgba(26, 143, 227, 0.1);
}

.chip.active {
  background: var(--gradient-primary);
  border: none;
  color: var(--color-text-primary);
}

/* ============================================================================
   10. PROGRESS BARS
   ============================================================================ */

.progress-bar {
  width: 100%;
  height: 12px;
  background-color: var(--color-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--color-surface-light);
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
  box-shadow: 0 0 10px rgba(102, 16, 242, 0.3);
}

.progress-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* XP Bar (Large variant) */
.xp-bar {
  width: 100%;
  height: 24px;
  background-color: var(--color-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 2px solid var(--color-primary);
  position: relative;
}

.xp-bar-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.1), 0 0 15px rgba(102, 16, 242, 0.4);
  position: relative;
}

.xp-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ============================================================================
   11. NOTIFICATIONS & TOASTS
   ============================================================================ */

.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.toast {
  background-color: var(--color-card);
  border: 1px solid rgba(102, 16, 242, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  animation: slideUp var(--transition-normal);
  min-width: 300px;
}

.toast.success {
  border-left: 4px solid var(--color-success);
}

.toast.error {
  border-left: 4px solid var(--color-error);
}

.toast.warning {
  border-left: 4px solid var(--color-warning);
}

.toast.info {
  border-left: 4px solid var(--color-info);
}

.toast-icon {
  font-size: var(--font-size-xl);
}

.toast-message {
  flex: 1;
  color: var(--color-text-primary);
}

.toast-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: var(--font-size-lg);
}

/* ============================================================================
   12. STEP INDICATORS
   ============================================================================ */

.step-indicator {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.step {
  flex: 1;
  text-align: center;
}

.step-dot {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-surface);
  border: 2px solid var(--color-surface-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-secondary);
  margin: 0 auto var(--spacing-sm);
  transition: all var(--transition-fast);
}

.step.active .step-dot {
  background: var(--gradient-primary);
  border-color: var(--color-primary);
  color: var(--color-text-primary);
  box-shadow: 0 0 15px rgba(102, 16, 242, 0.4);
}

.step.completed .step-dot {
  background-color: var(--color-success);
  border-color: var(--color-success);
  color: var(--color-text-primary);
}

.step-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.step.active .step-label {
  color: var(--color-secondary);
  font-weight: var(--font-weight-semibold);
}

/* ============================================================================
   13. CODE EDITOR & CODE BLOCKS
   ============================================================================ */

.code-block {
  background-color: var(--color-surface);
  border: 1px solid var(--color-surface-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-surface-light);
}

.code-block-language {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
}

.code-block-copy {
  background: none;
  border: none;
  color: var(--color-secondary);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  transition: color var(--transition-fast);
}

.code-block-copy:hover {
  color: var(--color-secondary-light);
}

.code-content {
  padding: var(--spacing-lg);
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

/* Code Editor */
.code-editor {
  background-color: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-sm);
  line-height: 1.6;
  color: var(--color-text-primary);
  resize: vertical;
  min-height: 300px;
}

/* ============================================================================
   14. COURSE & MISSION CARDS
   ============================================================================ */

.course-card {
  background: linear-gradient(135deg, var(--color-card) 0%, var(--color-surface) 100%);
  border: 1px solid rgba(102, 16, 242, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.course-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: -1;
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(102, 16, 242, 0.5);
}

.course-card:hover::before {
  opacity: 0.1;
}

.course-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
}

.course-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.course-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: var(--line-height-relaxed);
}

.course-meta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.course-meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Mission Card */
.mission-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-surface-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.mission-card:hover:not(.locked) {
  border-color: var(--color-secondary);
  background-color: rgba(26, 143, 227, 0.05);
  transform: translateX(4px);
}

.mission-card.locked {
  opacity: 0.6;
  cursor: not-allowed;
}

.mission-number {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.mission-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.mission-progress {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ============================================================================
   15. SKILL TAGS
   ============================================================================ */

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: rgba(102, 16, 242, 0.1);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
  font-weight: var(--font-weight-medium);
}

/* ============================================================================
   16. AVATARS
   ============================================================================ */

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-surface);
  border: 2px solid var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  background: var(--gradient-primary);
}

.avatar.lg {
  width: 64px;
  height: 64px;
  font-size: var(--font-size-2xl);
}

.avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

/* ============================================================================
   17. LOADING SKELETON
   ============================================================================ */

.skeleton {
  background: linear-gradient(90deg, var(--color-card) 0%, var(--color-surface) 50%, var(--color-card) 100%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: var(--radius-lg);
}

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

.skeleton-text {
  height: 16px;
  margin-bottom: var(--spacing-md);
  border-radius: var(--radius-md);
}

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

/* ============================================================================
   18. TOOLTIPS
   ============================================================================ */

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

.tooltip .tooltip-text {
  visibility: hidden;
  background-color: var(--color-card);
  color: var(--color-text-primary);
  text-align: center;
  border-radius: var(--radius-lg);
  padding: var(--spacing-sm) var(--spacing-md);
  position: absolute;
  z-index: var(--z-tooltip);
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  font-size: var(--font-size-sm);
  border: 1px solid var(--color-surface-light);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.tooltip:hover .tooltip-text {
  visibility: visible;
  opacity: 1;
}

/* ============================================================================
   19. RESPONSIVE BREAKPOINTS
   ============================================================================ */

@media (max-width: 1024px) {
  .sidebar {
    width: 200px;
  }

  .navbar-menu {
    gap: var(--spacing-lg);
  }

  h1 {
    font-size: var(--font-size-3xl);
  }
}

@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .navbar-menu {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: var(--spacing-lg);
  }

  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid rgba(102, 16, 242, 0.1);
  }

  .modal {
    width: 95%;
    max-height: 80vh;
  }

  .toast-container {
    left: var(--spacing-md);
    right: var(--spacing-md);
    bottom: var(--spacing-md);
  }

  .toast {
    min-width: auto;
  }

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

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

  .course-card {
    padding: var(--spacing-lg);
  }

  .course-icon {
    font-size: 36px;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-lg: 16px;
    --spacing-xl: 24px;
  }

  .navbar-brand {
    font-size: var(--font-size-xl);
  }

  .navbar-menu {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  .modal {
    width: 100%;
    border-radius: var(--radius-lg);
  }

  .step-indicator {
    flex-wrap: wrap;
  }
}

/* ============================================================================
   20. ANIMATIONS
   ============================================================================ */

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

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideLeft {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideRight {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 5px rgba(102, 16, 242, 0.5);
  }
  50% {
    box-shadow: 0 0 20px rgba(102, 16, 242, 0.8);
  }
}

@keyframes confetti {
  0% {
    opacity: 1;
    transform: translateY(0) rotate(0deg);
  }
  100% {
    opacity: 0;
    transform: translateY(500px) rotate(720deg);
  }
}

@keyframes flip {
  0% {
    transform: rotateY(0deg);
  }
  100% {
    transform: rotateY(180deg);
  }
}

@keyframes typing {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}

.typing-cursor {
  border-right: 3px solid var(--color-secondary);
  animation: blinkCursor 0.7s infinite;
}

@keyframes blinkCursor {
  0%, 49% {
    border-right-color: var(--color-secondary);
  }
  50%, 100% {
    border-right-color: transparent;
  }
}

/* Fade In Animation Utility */
.fade-in {
  animation: fadeIn var(--transition-normal);
}

.slide-up {
  animation: slideUp var(--transition-normal);
}

.pulse {
  animation: pulse var(--transition-slow) infinite;
}

.glow {
  animation: glow var(--transition-slow) infinite;
}

/* ============================================================================
   21. UTILITY CLASSES
   ============================================================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-lg {
  max-width: 1400px;
}

.container-sm {
  max-width: 800px;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.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);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.gap-xl {
  gap: var(--spacing-xl);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.px-md {
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.py-md {
  padding-top: var(--spacing-md);
  padding-bottom: var(--spacing-md);
}

.py-lg {
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
}

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

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

.text-muted {
  color: var(--color-text-secondary);
}

.text-error {
  color: var(--color-error);
}

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

.text-warning {
  color: var(--color-warning);
}

.text-uppercase {
  text-transform: uppercase;
}

.font-bold {
  font-weight: var(--font-weight-bold);
}

.font-semibold {
  font-weight: var(--font-weight-semibold);
}

.opacity-50 {
  opacity: 0.5;
}

.opacity-75 {
  opacity: 0.75;
}

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

.no-scroll {
  overflow: hidden;
}

/* ============================================================================
   22. SCROLLBAR STYLING
   ============================================================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-light);
}

/* Spinner animation for Gemini evaluator loading state */
@keyframes spin {
  to { transform: rotate(360deg); }
}