:root {
  --ca-bg: #f6f7fb;
  --ca-surface: #ffffff;
  --ca-border: #e7e9f1;
  --ca-primary: #0f172a;
  --ca-muted: #6b7280;
}

body {
  background: var(--ca-bg);
  color: var(--ca-primary);
}

.search-form {
  max-width: 520px;
}

.hero-section {
  background: linear-gradient(120deg, #ffffff 0%, #eef2ff 100%);
  border: 1px solid var(--ca-border);
}

.course-hero {
  background: linear-gradient(140deg, #111827 0%, #1f2937 100%);
  color: #fff;
}

.course-card,
.hero-stats,
.lesson-sidebar,
.card {
  border: 1px solid var(--ca-border);
}

.course-card .card-img-top,
.card-img-top {
  height: 160px;
  object-fit: cover;
}

.course-thumb-placeholder {
  height: 160px;
  background: repeating-linear-gradient(
    45deg,
    #eef2ff,
    #eef2ff 12px,
    #e5e7eb 12px,
    #e5e7eb 24px
  );
  color: var(--ca-muted);
  font-size: 0.9rem;
}

.course-free-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
}

.lesson-list {
  max-height: 480px;
  overflow: auto;
}

.progress {
  height: 10px;
}

@media (max-width: 991px) {
  .search-form {
    max-width: none;
  }

  .lesson-list {
    max-height: none;
  }
}