/* =====================================================
   PUBLIC PAGES - Courses, About, Contact, Guide
   ===================================================== */

/* ----- Filter chip ----- */
.filter-chip {
  display: inline-block;
  padding: 8px 18px;
  background: #fff;
  border: 1px solid #e6e8ec;
  border-radius: 24px;
  color: var(--text-dark);
  font-size: .9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all .15s;
  cursor: pointer;
}
.filter-chip:hover {
  border-color: var(--brand-blue);
  color: var(--brand-blue);
}
.filter-chip.active {
  background: rgba(31,111,235,.12);
  border-color: var(--brand-blue);
  color: var(--brand-blue);
  font-weight: 600;
}

.sort-dropdown .dropdown-toggle::after { margin-left: 8px; }

/* ----- Course card v2 (Khoa hoc list) ----- */
.course-card-v2 {
  background: #fff;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(15,23,42,.06);
  transition: all .2s;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.course-card-v2:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(15,23,42,.12);
}
.course-thumb-v2 {
  aspect-ratio: 5 / 3;
  background: #eef0f4;
  overflow: hidden;
  position: relative;
}
.course-thumb-v2 img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  display: block;
}
.course-thumb-v2 .course-thumb-placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #ff6b1a22, #1f6feb22);
  color: var(--brand-orange);
  font-size: 3rem;
}
.course-badge-v2 {
  position: absolute; top: 10px; right: 10px;
  padding: 4px 10px; border-radius: 12px;
  color: #fff; font-size: .72rem; font-weight: 700;
}

.course-body-v2 {
  padding: 16px;
  display: flex; flex-direction: column; flex: 1;
}
.course-title-v2 {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 10px;
  color: var(--text-dark);
  display: -webkit-box;
  -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.6em;
}
.course-instructor {
  font-size: .82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.course-rating {
  display: flex; align-items: center; gap: 6px;
  margin-bottom: 12px;
  font-size: .85rem;
}
.course-rating .rating-num {
  font-weight: 700;
  color: var(--brand-orange);
}
.course-price-row {
  display: flex; align-items: baseline; gap: 8px;
  margin-top: auto;
  font-size: 1.05rem;
}
.course-price-row .price-strike {
  text-decoration: line-through;
  color: #aaa;
  font-weight: 400;
  font-size: .85rem;
}

/* ----- About page ----- */
.about-stats-band {
  background: linear-gradient(135deg, #16181d 0%, #1c1f2a 100%);
  color: #fff;
}
.about-stat-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--brand-orange);
  line-height: 1;
  margin-bottom: 8px;
}
.about-stat-label {
  font-size: .9rem;
  color: rgba(255,255,255,.85);
  font-weight: 500;
}
.about-feature {
  background: #fff;
  border-radius: 14px;
  padding: 28px 20px;
  height: 100%;
  box-shadow: 0 2px 12px rgba(15,23,42,.06);
  transition: all .2s;
}
.about-feature:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(15,23,42,.12);
}
.about-feature-icon {
  font-size: 3rem;
  line-height: 1;
}

/* ----- Contact page ----- */
.contact-icon {
  width: 44px; height: 44px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.bg-orange {
  background: var(--brand-orange) !important;
}
.social-btn {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  text-decoration: none;
  transition: all .15s;
}
.social-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255,107,26,.3);
}
.contact-form-card {
  background: #fff;
  border-radius: 14px;
  padding: 32px;
  box-shadow: 0 4px 24px rgba(15,23,42,.08);
}
.contact-form-card .form-control {
  border: 1px solid #e6e8ec;
  padding: 12px 14px;
}
.contact-form-card .form-control:focus {
  border-color: var(--brand-orange);
  box-shadow: 0 0 0 .2rem rgba(255,107,26,.15);
}
.btn-danger {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%) !important;
  border: none !important;
}
.btn-danger:hover {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%) !important;
}

/* ===== V36 targeted fix: public course cards mobile/frame ===== */
.course-thumb-v2,
.course-card-v2 .thumb,
.cd-buy-thumb,
.course-cover,
.course-card-image {
  aspect-ratio: 5 / 3;
  overflow: hidden;
}
.course-thumb-v2 img,
.course-card-v2 .thumb img,
.cd-buy-thumb img,
.course-cover img,
.course-card-image img {
  width: 100% !important;
  height: 100% !important;
  object-fit: cover !important;
  object-position: center center !important;
  display: block;
}
@media (max-width: 767.98px) {
  .courses-grid-v2,
  .course-grid,
  .course-list-grid {
    grid-template-columns: 1fr !important;
    gap: 14px !important;
  }
  .course-card-v2,
  .course-card {
    border-radius: 14px;
  }
  .courses-filter-row,
  .course-filter-bar {
    gap: 8px;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }
  .courses-sort,
  .sort-dropdown {
    width: 100%;
    justify-content: flex-start;
  }
}


/* V76: Social icons link chuẩn Facebook / YouTube / TikTok */
.social-facebook { background: #1877f2 !important; }
.social-youtube { background: #ff0000 !important; }
.social-tiktok { background: #111827 !important; }
.contact-social-links .social-btn { width: 42px; height: 42px; border-radius: 14px; }