/* ==========================================================================
   British Student Room (BSR) Course Ecosystem Shared Styles
   Aesthetic: Light Academic Luxury (Oxford / Cambridge Editorial Design)
   Primary: Deep Academic Blue (#001A4D) | Accent: Oxford Gold (#B89F6B)
   ========================================================================== */

:root {
  /* Brand Palette */
  --c-primary: #001A4D;
  --c-primary-hover: #072666;
  --c-primary-light: #0D3482;
  --c-primary-soft: rgba(0, 26, 77, 0.06);

  --c-accent: #B89F6B;
  --c-accent-hover: #A48B57;
  --c-accent-light: #CBB482;
  --c-accent-soft: rgba(184, 159, 107, 0.12);

  --c-shimmer-gold: #E0C28A;
  --c-shimmer-soft: rgba(224, 194, 138, 0.22);

  /* Warm Academic Backgrounds */
  --c-bg: #FAF8F5;
  --c-card: #FFFFFF;
  --c-surface: #F4EFE6;
  --c-surface-hover: #ECE4D4;
  --c-border: #E8E2D5;
  --c-border-light: #F2ECE0;

  /* Typography */
  --c-text: #001A4D;
  --c-text-sub: #334155;
  --c-text-muted: #64748B;

  /* Semantic Badges */
  --c-badge-blue-bg: rgba(0, 26, 77, 0.08);
  --c-badge-blue-text: #001A4D;
  --c-badge-gold-bg: rgba(184, 159, 107, 0.15);
  --c-badge-gold-text: #78612E;
  --c-badge-green-bg: #ECFDF5;
  --c-badge-green-text: #065F46;
  --c-badge-red-bg: #FEF2F2;
  --c-badge-red-text: #991B1B;
  --c-badge-warn-bg: #FFFBEB;
  --c-badge-warn-text: #92400E;
  --c-badge-purple-bg: #F3E8FF;
  --c-badge-purple-text: #6B21A8;

  /* Shadows */
  --c-shadow-xs: 0 1px 2px rgba(0, 26, 77, 0.04);
  --c-shadow-sm: 0 2px 6px rgba(0, 26, 77, 0.06);
  --c-shadow-md: 0 6px 18px rgba(0, 26, 77, 0.08);
  --c-shadow-lg: 0 14px 34px rgba(0, 26, 77, 0.12);
  --c-shadow-gold: 0 6px 20px rgba(184, 159, 107, 0.25);

  /* Radius */
  --c-radius-sm: 6px;
  --c-radius-md: 10px;
  --c-radius-lg: 16px;
  --c-radius-xl: 22px;
  --c-radius-full: 9999px;
}

/* ==========================================================================
   Page Layout & Containers
   ========================================================================== */
.courses-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.courses-hero {
  background: linear-gradient(135deg, #001A4D 0%, #072666 65%, #001A4D 100%);
  border-radius: var(--c-radius-lg);
  padding: 36px 32px;
  color: #FFFFFF;
  position: relative;
  overflow: hidden;
  box-shadow: var(--c-shadow-md);
  margin-bottom: 28px;
  border-bottom: 2px solid var(--c-accent);
}

.courses-hero::after {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(184, 159, 107, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.courses-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(184, 159, 107, 0.2);
  border: 1px solid var(--c-accent);
  color: #E0C28A;
  padding: 5px 14px;
  border-radius: var(--c-radius-full);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.3px;
  margin-bottom: 14px;
}

.courses-hero-title {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.25;
  color: #FFFFFF;
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}

.courses-hero-sub {
  font-size: 15px;
  color: #E2E8F0;
  max-width: 720px;
  line-height: 1.6;
}

/* ==========================================================================
   Navigation Tabs
   ========================================================================== */
.courses-tab-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--c-card);
  padding: 6px;
  border-radius: var(--c-radius-md);
  border: 1px solid var(--c-border);
  box-shadow: var(--c-shadow-xs);
  margin-bottom: 24px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.courses-tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--c-radius-sm);
  background: transparent;
  border: none;
  color: var(--c-text-sub);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.courses-tab-btn ion-icon {
  font-size: 18px;
}

.courses-tab-btn:hover {
  background: var(--c-surface);
  color: var(--c-primary);
}

.courses-tab-btn.active {
  background: var(--c-primary);
  color: #FFFFFF;
  box-shadow: var(--c-shadow-xs);
}

.courses-tab-btn.active ion-icon {
  color: #E0C28A;
}

/* ==========================================================================
   Filter Bar & Controls
   ========================================================================== */
.courses-filter-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
  background: var(--c-card);
  padding: 16px 20px;
  border-radius: var(--c-radius-md);
  border: 1px solid var(--c-border);
  box-shadow: var(--c-shadow-xs);
  margin-bottom: 24px;
}

.courses-filter-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.courses-filter-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--c-text-muted);
  letter-spacing: 0.5px;
}

.courses-filter-select,
.courses-filter-input {
  width: 100%;
  padding: 9px 12px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--c-radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.courses-filter-select:focus,
.courses-filter-input:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(184, 159, 107, 0.18);
  background: #FFFFFF;
}

/* ==========================================================================
   Course Cards Grid
   ========================================================================== */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 22px;
}

.course-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--c-radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  box-shadow: var(--c-shadow-xs);
  position: relative;
}

.course-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--c-shadow-md);
  border-color: var(--c-accent);
}

.course-card-header {
  padding: 18px 20px 14px;
  background: linear-gradient(180deg, var(--c-surface) 0%, #FFFFFF 100%);
  border-bottom: 1px solid var(--c-border-light);
}

.course-card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.course-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: var(--c-radius-full);
  letter-spacing: 0.2px;
}

.course-badge-blue {
  background: var(--c-badge-blue-bg);
  color: var(--c-badge-blue-text);
}

.course-badge-gold {
  background: var(--c-badge-gold-bg);
  color: var(--c-badge-gold-text);
  border: 1px solid rgba(184, 159, 107, 0.3);
}

.course-badge-green {
  background: var(--c-badge-green-bg);
  color: var(--c-badge-green-text);
}

.course-badge-red {
  background: var(--c-badge-red-bg);
  color: var(--c-badge-red-text);
}

.course-badge-warn {
  background: var(--c-badge-warn-bg);
  color: var(--c-badge-warn-text);
}

.course-badge-purple {
  background: var(--c-badge-purple-bg);
  color: var(--c-badge-purple-text);
}

.course-card-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--c-text);
  line-height: 1.35;
  margin-bottom: 4px;
}

.course-card-subject {
  font-size: 13.5px;
  color: var(--c-text-muted);
  font-weight: 500;
}

.course-card-body {
  padding: 16px 20px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.course-tutor-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.course-tutor-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--c-surface);
  border: 1.5px solid var(--c-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--c-primary);
  font-size: 15px;
  object-fit: cover;
}

.course-tutor-name {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--c-text);
}

.course-tutor-exp {
  font-size: 12px;
  color: var(--c-text-muted);
}

.course-timings-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 10px;
  background: var(--c-bg);
  border-radius: var(--c-radius-sm);
  border: 1px solid var(--c-border-light);
  font-size: 12px;
  color: var(--c-text-sub);
  font-weight: 500;
}

.course-timings-strip ion-icon {
  color: var(--c-accent);
  font-size: 15px;
}

.course-card-footer {
  padding: 14px 20px 18px;
  border-top: 1px solid var(--c-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: #FFFFFF;
}

.course-price-wrap {
  display: flex;
  flex-direction: column;
}

.course-price-label {
  font-size: 11px;
  text-transform: uppercase;
  color: var(--c-text-muted);
  font-weight: 700;
}

.course-price-val {
  font-size: 18px;
  font-weight: 800;
  color: var(--c-primary);
}

.course-price-sub {
  font-size: 11.5px;
  color: var(--c-accent-hover);
  font-weight: 600;
}

/* ==========================================================================
   Buttons & Interactive Elements
   ========================================================================== */
.c-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 9px 16px;
  border-radius: var(--c-radius-sm);
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.18s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.c-btn-primary {
  background: var(--c-primary);
  color: #FFFFFF;
}

.c-btn-primary:hover {
  background: var(--c-primary-hover);
  box-shadow: 0 4px 12px rgba(0, 26, 77, 0.2);
}

.c-btn-gold {
  background: var(--c-accent);
  color: #FFFFFF;
}

.c-btn-gold:hover {
  background: var(--c-accent-hover);
  box-shadow: var(--c-shadow-gold);
}

.c-btn-outline {
  background: transparent;
  border-color: var(--c-border);
  color: var(--c-text);
}

.c-btn-outline:hover {
  background: var(--c-surface);
  border-color: var(--c-accent);
}

.c-btn-sm {
  padding: 6px 12px;
  font-size: 12.5px;
}

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

/* ==========================================================================
   Live Pulse & Status Indicator
   ========================================================================== */
.live-pulse-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #EF4444;
  box-shadow: 0 0 0 rgba(239, 68, 68, 0.5);
  animation: livePulse 1.6s infinite;
}

@keyframes livePulse {
  0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

/* ==========================================================================
   Capacity Progress Meters
   ========================================================================== */
.capacity-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.capacity-meta {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-text-sub);
}

.capacity-bar {
  width: 100%;
  height: 8px;
  background: var(--c-border-light);
  border-radius: var(--c-radius-full);
  overflow: hidden;
}

.capacity-fill {
  height: 100%;
  background: linear-gradient(90deg, #10B981, #059669);
  border-radius: var(--c-radius-full);
  transition: width 0.4s ease;
}

.capacity-fill.high {
  background: linear-gradient(90deg, #F59E0B, #D97706);
}

.capacity-fill.full {
  background: linear-gradient(90deg, #EF4444, #DC2626);
}

/* ==========================================================================
   Modals
   ========================================================================== */
.course-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 26, 77, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: modalFadeIn 0.2s ease;
}

.course-modal-overlay.active {
  display: flex;
}

.course-modal-content {
  background: #FFFFFF;
  border-radius: var(--c-radius-lg);
  max-width: 580px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--c-shadow-lg);
  border: 1px solid var(--c-border);
  overflow: hidden;
  animation: modalSlideUp 0.25s ease;
}

.course-modal-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--c-surface);
}

.course-modal-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--c-primary);
}

.course-modal-close {
  background: transparent;
  border: none;
  font-size: 24px;
  color: var(--c-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  transition: color 0.15s ease;
}

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

.course-modal-body {
  padding: 24px;
  overflow-y: auto;
  font-size: 14.5px;
  color: var(--c-text-sub);
  line-height: 1.6;
}

.course-modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--c-border-light);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  background: var(--c-bg);
}

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

@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */
#course-toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.course-toast {
  pointer-events: auto;
  min-width: 280px;
  max-width: 420px;
  background: #FFFFFF;
  border-radius: var(--c-radius-md);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--c-shadow-lg);
  border-left: 4px solid var(--c-primary);
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
  animation: toastSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.course-toast.toast-success {
  border-left-color: #10B981;
}

.course-toast.toast-error {
  border-left-color: #EF4444;
}

.course-toast.toast-warning {
  border-left-color: #F59E0B;
}

.course-toast ion-icon {
  font-size: 20px;
}

.course-toast.toast-success ion-icon { color: #10B981; }
.course-toast.toast-error ion-icon { color: #EF4444; }
.course-toast.toast-warning ion-icon { color: #F59E0B; }

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

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 768px) {
  .courses-container {
    padding: 16px 14px 70px;
  }
  .courses-hero {
    padding: 24px 20px;
  }
  .courses-hero-title {
    font-size: 24px;
  }
  .courses-grid {
    grid-template-columns: 1fr;
  }
  .courses-filter-bar {
    grid-template-columns: 1fr;
  }
}