/**
 * Edutrack Student Interface Design Tokens
 * Scandinavian Warm Professional aesthetic
 * Extends existing Tailwind config with semantic tokens
 */

:root {
  /* === BRAND COLORS === */
  --color-primary-50: #EBF4FF;
  --color-primary-100: #D6E9FF;
  --color-primary-200: #AED3FF;
  --color-primary-300: #7DB8FF;
  --color-primary-400: #4A9BFF;
  --color-primary-500: #2E70DA;
  --color-primary-600: #1E5AB8;
  --color-primary-700: #1A4A94;
  --color-primary-800: #163B75;
  --color-primary-900: #122E5C;

  --color-secondary-50: #FDF5E6;
  --color-secondary-100: #FCEBD0;
  --color-secondary-200: #F9D7A0;
  --color-secondary-300: #F6C370;
  --color-secondary-400: #F3AF40;
  --color-secondary-500: #F6B745;
  --color-secondary-600: #D89E2E;
  --color-secondary-700: #B8851F;

  /* === SEMANTIC SURFACES === */
  --surface-primary: #FAFBFC;
  --surface-secondary: #FFFFFF;
  --surface-tertiary: #F3F4F6;
  --surface-elevated: #FFFFFF;
  --surface-warm: #FDF8F3;
  --surface-success: #ECFDF5;
  --surface-warning: #FFFBEB;
  --surface-error: #FEF2F2;
  --surface-info: #EFF6FF;

  /* === TEXT COLORS === */
  --text-primary: #1F2937;
  --text-secondary: #4B5563;
  --text-tertiary: #9CA3AF;
  --text-inverse: #FFFFFF;
  --text-muted: #6B7280;

  /* === BORDERS === */
  --border-primary: #E5E7EB;
  --border-secondary: #F3F4F6;
  --border-focus: #2E70DA;

  /* === ACCENTS === */
  --accent-primary: #2E70DA;
  --accent-primary-hover: #1E5AB8;
  --accent-primary-active: #1A4A94;
  --accent-secondary: #F6B745;
  --accent-secondary-hover: #D89E2E;

  /* === STATUS === */
  --status-success: #10B981;
  --status-success-bg: #ECFDF5;
  --status-warning: #F59E0B;
  --status-warning-bg: #FFFBEB;
  --status-error: #EF4444;
  --status-error-bg: #FEF2F2;
  --status-info: #3B82F6;
  --status-info-bg: #EFF6FF;

  /* === SPACING (8px base) === */
  --space-0: 0;
  --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;

  /* === SHADOWS === */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
  --shadow-card: 0 0 0 1px rgba(0, 0, 0, 0.03), 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 0 0 1px rgba(0, 0, 0, 0.03), 0 12px 24px rgba(0, 0, 0, 0.08);
  --shadow-inset: inset 0 2px 4px 0 rgba(0, 0, 0, 0.04);

  /* === RADIUS === */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.25rem;
  --radius-full: 9999px;

  /* === MOTION === */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --easing-default: cubic-bezier(0.4, 0, 0.2, 1);
  --easing-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --easing-out: cubic-bezier(0, 0, 0.2, 1);
}

/* === PROGRESS RING UTILITIES === */
.progress-ring {
  transform: rotate(-90deg);
}
.progress-ring-circle {
  transition: stroke-dashoffset var(--duration-slow) var(--easing-out);
}

/* === CARD HOVER LIFT === */
.card-hover {
  transition: transform var(--duration-normal) var(--easing-default),
              box-shadow var(--duration-normal) var(--easing-default);
}
.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

/* === STAT CARD === */
.stat-card {
  background: var(--surface-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  transition: box-shadow var(--duration-normal) var(--easing-default);
}
.stat-card:hover {
  box-shadow: var(--shadow-lg);
}
.stat-card-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* === COURSE CARD === */
.course-card {
  background: var(--surface-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--duration-normal) var(--easing-default),
              box-shadow var(--duration-normal) var(--easing-default);
}
.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

/* === COMPLETED COURSE CARD === */
.course-card-completed {
  background: linear-gradient(135deg, var(--surface-success) 0%, var(--surface-secondary) 100%);
  border-color: #A7F3D0;
}

/* === BUTTON PATTERNS === */
.btn-primary {
  background-color: var(--accent-primary);
  color: var(--text-inverse);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-lg);
  font-weight: 500;
  transition: background-color var(--duration-fast) var(--easing-default),
              transform var(--duration-fast) var(--easing-default);
}
.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  transform: translateY(-1px);
}
.btn-primary:active {
  background-color: var(--accent-primary-active);
  transform: translateY(0);
}

/* === ONBOARDING CHECKLIST === */
.checklist-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  transition: background-color var(--duration-fast) var(--easing-default);
}
.checklist-item:hover {
  background-color: var(--surface-tertiary);
}
.checklist-item-done {
  background-color: var(--surface-success);
}
.checklist-icon {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* === LESSON SIDEBAR === */
.lesson-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: background-color var(--duration-fast) var(--easing-default);
}
.lesson-item:hover {
  background-color: var(--surface-tertiary);
}
.lesson-item-active {
  background-color: var(--color-primary-50);
  color: var(--accent-primary);
}
.lesson-item-completed {
  color: var(--status-success);
}

/* === EMPTY STATE === */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
}
.empty-state-icon {
  width: 4rem;
  height: 4rem;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
}

/* === CELEBRATION ANIMATION === */
@keyframes celebration-pop {
  0% { transform: scale(0.8); opacity: 0; }
  50% { transform: scale(1.1); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}
.celebration-pop {
  animation: celebration-pop var(--duration-slow) var(--easing-bounce);
}

/* === REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
  .card-hover:hover,
  .course-card:hover,
  .btn-primary:hover {
    transform: none;
  }
  .progress-ring-circle {
    transition: none;
  }
}