/**
 * Course Form Tabs - Modern Tab Navigation Styling
 * Redesigned to match horizontal underline tab style
 * No excessive colors - minimal, clean design
 */

/* ============================================
   1. CSS Variables (Design Tokens)
   ============================================ */
:root {
  /* Colors */
  --cf-primary: #2563eb;
  --cf-primary-dark: #1e40af;
  --cf-text-primary: #313a46;
  --cf-text-secondary: #6c757d;
  --cf-border: #e5e7eb;
  --cf-bg-input: #f4f6fb;
  --cf-bg-page: #f8f9fa;
  --cf-bg-hover: #f9fafb;

  /* Typography */
  --cf-tab-font-size: 14px;
  --cf-label-font-size: 12px;

  /* Spacing */
  --cf-tab-padding-x: 16px;
  --cf-tab-padding-y: 12px;
  --cf-tab-gap: 8px;

  /* Effects */
  --cf-border-radius: 6px;
  --cf-active-border-width: 3px;
  --cf-transition: 0.15s ease;
}

/* ============================================
   2. Tab Navigation Container
   ============================================ */
.course-form-tabs {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-border-radius);
  padding: 0 12px;
  margin-bottom: 24px;
  background: #fff;
  list-style: none;
}

.course-form-tabs .nav-item {
  margin-bottom: -1px;
}

/* ============================================
   3. Tab Link Styles
   ============================================ */
.course-form-tabs .nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--cf-tab-gap);
  padding: var(--cf-tab-padding-y) var(--cf-tab-padding-x);
  color: var(--cf-text-secondary);
  font-size: var(--cf-tab-font-size);
  font-weight: 500;
  background: transparent;
  border: none;
  border-bottom: var(--cf-active-border-width) solid transparent;
  border-radius: 0;
  transition: color var(--cf-transition), border-color var(--cf-transition);
  text-decoration: none;
  white-space: nowrap;
}

.course-form-tabs .nav-link:hover,
.course-form-tabs .nav-link:focus {
  color: var(--cf-primary);
  background: transparent;
  text-decoration: none;
}

/* ============================================
   4. Active Tab State
   ============================================ */
.course-form-tabs .nav-link.active {
  color: var(--cf-primary);
  font-weight: 600;
  background: transparent;
  border-bottom-color: var(--cf-primary);
}

/* ============================================
   5. Tab Icons
   ============================================ */
.course-form-tabs .nav-link i {
  font-size: 16px;
  opacity: 0.8;
  line-height: 1;
}

.course-form-tabs .nav-link:hover i,
.course-form-tabs .nav-link.active i {
  opacity: 1;
}

/* ============================================
   6. Tab Badges
   ============================================ */
.course-form-tabs .tab-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  line-height: 1;
  color: var(--cf-text-secondary);
  background: #e5e7eb;
  border-radius: 10px;
}

.course-form-tabs .tab-badge.badge-primary {
  color: #fff;
  background: var(--cf-primary);
}

.course-form-tabs .tab-badge.badge-success {
  color: #fff;
  background: #22c55e;
}

/* ============================================
   7. Button Variants (Minimal Colors)
   ============================================ */

/* Outline Minimal Button - Primary choice for most actions */
.btn-outline-minimal {
  color: var(--cf-text-secondary);
  background: transparent;
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-border-radius);
  font-weight: 500;
  padding: 8px 16px;
  font-size: 13px;
  transition: all var(--cf-transition);
}

.btn-outline-minimal:hover,
.btn-outline-minimal:focus {
  color: var(--cf-text-primary);
  background: var(--cf-bg-hover);
  border-color: #d1d5db;
  text-decoration: none;
}

/* Back Button - For navigation back actions */
.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--cf-text-secondary);
  background: #fff;
  border: 1px solid var(--cf-border);
  border-radius: var(--cf-border-radius);
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  transition: all var(--cf-transition);
  text-decoration: none;
}

.btn-back:hover,
.btn-back:focus {
  color: var(--cf-text-primary);
  background: var(--cf-bg-hover);
  text-decoration: none;
}

.btn-back i {
  font-size: 14px;
}

/* ============================================
   8. Ajax Loader (moved outside tabs)
   ============================================ */
.course-form-ajax-loader {
  width: 100%;
  padding-bottom: 12px;
  background: #fff;
}

/* ============================================
   9. Responsive Adjustments
   ============================================ */
@media (max-width: 991px) {
  .course-form-tabs .nav-link {
    padding: var(--cf-tab-padding-y) 12px;
    font-size: 13px;
  }
}

@media (max-width: 768px) {
  .course-form-tabs .nav-link span {
    display: none;
  }

  .course-form-tabs .nav-link {
    padding: 12px;
    justify-content: center;
  }

  .course-form-tabs .nav-link i {
    font-size: 18px;
    margin: 0;
  }

  .course-form-tabs .tab-badge {
    display: none;
  }
}

@media (max-width: 576px) {
  .course-form-tabs {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

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

  .course-form-tabs .nav-item {
    flex-shrink: 0;
  }
}