/* ============================================
   COMPONENT STYLES
   Reusable UI Components: Buttons, Cards, Forms, Badges, etc.
   ============================================ */

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

.btn {
  display: inline-block;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  line-height: var(--leading-none);
  text-align: center;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  user-select: none;
}

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

/* Primary Button */
.btn-primary {
  background-color: var(--color-primary-600);
  color: #ffffff;
  border-color: var(--color-primary-600);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-700);
  border-color: var(--color-primary-700);
  color: #ffffff !important;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Secondary Button */
.btn-secondary {
  background-color: transparent;
  color: var(--color-primary-600);
  border-color: var(--color-primary-600);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-primary-50);
  border-color: var(--color-primary-700);
  color: var(--color-primary-700);
}

[data-theme="dark"] .btn-secondary:hover:not(:disabled) {
  background-color: var(--color-primary-900);
  color: var(--color-primary-300) !important;
}

/* Outline Button */
.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--color-primary-600);
  color: var(--color-primary-600);
  background-color: var(--color-primary-50);
}

[data-theme="dark"] .btn-outline:hover:not(:disabled) {
  background-color: var(--color-primary-900);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn-block {
  display: block;
  width: 100%;
}

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

.card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-base);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-primary-200);
}

.card-img-top {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.card-body {
  padding: var(--space-6);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  line-height: var(--leading-tight);
}

.card-text {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  flex: 1;
}

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

/* Course Card Specific */
.course-card {
  position: relative;
}

.course-card-badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background-color: var(--color-primary-600);
  color: #ffffff;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-md);
  z-index: var(--z-base);
}

.course-card-category {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-primary-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.course-card-features {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-4) 0;
}

.course-card-features li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.course-card-features li::before {
  content: "✓";
  color: var(--color-primary-600);
  font-weight: var(--font-bold);
}

.course-card-price-section {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-4);
  margin-top: auto;
  border-top: 1px solid var(--border-color);
}

.course-card-price {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.price-amount {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
}

.price-note {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.course-card-rating {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-warning);
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
}

.course-card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

/* Student Result Card */
.result-card {
  text-align: center;
}

.result-card-img {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  object-fit: cover;
  margin: 0 auto var(--space-4);
  border: 4px solid var(--color-primary-200);
}

.result-card-name {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-primary-600);
  margin-bottom: var(--space-2);
}

.result-card-score {
  font-size: var(--text-4xl);
  font-weight: var(--font-extrabold);
  color: var(--color-primary-600);
  margin-bottom: var(--space-2);
}

.result-card-meta {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

/* ===== FORMS ===== */

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

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

.form-label-required::after {
  content: " *";
  color: var(--color-error);
}

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

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--border-color-hover);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary-600);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-select:focus,
[data-theme="dark"] .form-textarea:focus {
  box-shadow: 0 0 0 3px var(--color-primary-900);
}

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

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

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

.form-help-text {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.form-error-text {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-error);
}

/* Checkbox & Radio */
.form-checkbox,
.form-radio {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.form-checkbox input,
.form-radio input {
  cursor: pointer;
}

/* ===== BADGES ===== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  background-color: var(--color-primary-100);
  color: var(--color-primary-700);
}

.badge-success {
  background-color: #d1fae5;
  color: #065f46;
}

.badge-warning {
  background-color: #fed7aa;
  color: #92400e;
}

.badge-error {
  background-color: #fee2e2;
  color: #991b1b;
}

[data-theme="dark"] .badge-primary {
  background-color: var(--color-primary-900);
  color: var(--color-primary-300);
}

/* ===== ACCORDION ===== */

.accordion {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.accordion-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  overflow: hidden;
  background-color: var(--bg-primary);
}

.accordion-header {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  text-align: left;
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-fast);
}

.accordion-header:hover {
  background-color: var(--bg-tertiary);
}

.accordion-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.accordion-item.active .accordion-icon {
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.accordion-item.active .accordion-content {
  max-height: 2000px;
}

.accordion-body {
  padding: var(--space-6);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

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

.tabs {
  border-bottom: 2px solid var(--border-color);
  margin-bottom: var(--space-6);
}

.tabs-list {
  display: flex;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

.tabs-item {
  margin: 0;
}

.tabs-link {
  display: block;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  border-bottom: 3px solid transparent;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.tabs-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-secondary);
}

.tabs-link.active {
  color: var(--color-primary-600);
  border-bottom-color: var(--color-primary-600);
  font-weight: var(--font-semibold);
}

.tab-content {
  display: none;
}

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

/* ===== ALERTS ===== */

.alert {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  margin-bottom: var(--space-4);
}

.alert-success {
  background-color: #d1fae5;
  border-color: #059669;
  color: #065f46;
}

.alert-warning {
  background-color: #fed7aa;
  border-color: #d97706;
  color: #92400e;
}

.alert-error {
  background-color: #fee2e2;
  border-color: #dc2626;
  color: #991b1b;
}

.alert-info {
  background-color: #dbeafe;
  border-color: #2563eb;
  color: #1e40af;
}

/* ===== BREADCRUMB ===== */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-6) 0;
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

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

.breadcrumb-item::after {
  content: "›";
  color: var(--text-tertiary);
}

.breadcrumb-item:last-child::after {
  content: "";
}

.breadcrumb-link {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--color-primary-600);
}

/* ===== LOADING SPINNER ===== */

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top-color: var(--color-primary-600);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
}

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

/* ===== SOCIAL ICONS ===== */

.social-icons {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  transition: all var(--transition-base);
}

.social-icon:hover {
  background-color: var(--color-primary-600);
  color: #ffffff;
  transform: translateY(-2px);
}

.social-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* ============================================
   MOBILE-OPTIMIZED COMPONENTS
   ============================================ */

@media (max-width: 767px) {
  /* BUTTONS - Full width and proper touch targets */
  .btn,
  button.btn,
  .btn-modal {
    width: 100%;
    min-height: var(--touch-target-min);
    padding: 14px 20px;
    font-size: var(--mobile-text-sm);
  }

  .btn-group {
    flex-direction: column;
    gap: var(--mobile-space-sm);
  }

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

  /* CARDS - Full width, reduced padding */
  .card {
    padding: var(--mobile-space-md);
    border-radius: var(--radius-lg);
  }

  .card-header {
    padding: var(--mobile-space-md);
  }

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

  .card-footer {
    padding: var(--mobile-space-md);
  }

  /* FORMS - Full width inputs */
  input:not([type="checkbox"]):not([type="radio"]),
  textarea,
  select {
    width: 100%;
    font-size: var(--mobile-text-base); /* 16px prevents iOS zoom */
    min-height: var(--touch-target-min);
    padding: 12px 16px;
  }

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

  .form-row {
    flex-direction: column;
    gap: var(--mobile-space-md);
  }

  .form-row > * {
    width: 100%;
  }

  /* BADGES - Smaller on mobile */
  .badge {
    padding: 4px 10px;
    font-size: var(--mobile-text-xs);
  }

  /* ALERTS - Full width, reduced padding */
  .alert {
    padding: var(--mobile-space-md);
    border-radius: var(--radius-lg);
  }

  /* MODALS - Almost full screen on mobile */
  .modal-content {
    width: 95vw;
    max-width: 95vw;
    margin: var(--mobile-space-sm);
    max-height: 90vh;
    overflow-y: auto;
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding: var(--mobile-space-md);
  }

  /* TABLES - Enable horizontal scroll */
  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  table {
    font-size: var(--mobile-text-sm);
  }

  /* BREADCRUMBS - Smaller text */
  .breadcrumb {
    font-size: var(--mobile-text-xs);
    padding: var(--mobile-space-sm);
  }

  /* SOCIAL ICONS - Slightly smaller */
  .social-icon {
    width: 36px;
    height: 36px;
  }

  .social-icon svg {
    width: 18px;
    height: 18px;
  }

  /* PAGINATION - Smaller buttons */
  .pagination-btn {
    min-width: var(--touch-target-min);
    min-height: var(--touch-target-min);
    padding: 10px;
  }

  /* TABS - Stack on mobile */
  .tabs-list {
    flex-direction: column;
    gap: var(--mobile-space-xs);
  }

  .tab {
    width: 100%;
    justify-content: flex-start;
  }
}