/* Layout */
.stm-archive-wrap {
  display: flex;
  gap: 0;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
  align-items: flex-start;
}

/* Sidebar */
.stm-cat-sidebar {
  width: 230px;
  flex-shrink: 0;
  position: sticky;
  top: 100px;
  border-right: 1px solid #e5e7eb;
  padding-right: 1.5rem;
}

.stm-sidebar-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #9ca3af;
  margin-bottom: 0.75rem;
}

.stm-cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.stm-cat-item {
  margin: 0;
}

.stm-cat-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: 6px;
  border-left: 3px solid transparent;
  text-decoration: none;
  font-size: 14px;
  color: #374151;
  transition: all 0.15s ease;
}

.stm-cat-link:hover {
  background: #f3f4f6;
  color: #111827;
  text-decoration: none;
}

.stm-cat-link.active {
  border-left-color: #6366f1;
  background: #eef2ff;
  color: #4338ca;
  font-weight: 600;
}

.stm-cat-count {
  font-size: 12px;
  background: #f3f4f6;
  color: #6b7280;
  padding: 2px 8px;
  border-radius: 999px;
  min-width: 24px;
  text-align: center;
}

.stm-cat-link.active .stm-cat-count {
  background: #c7d2fe;
  color: #3730a3;
}

/* Main area */
.stm-course-main {
  flex: 1;
  padding-left: 2rem;
  min-width: 0;
}

.stm-main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.stm-main-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
  color: #111827;
}

.stm-result-count {
  font-size: 13px;
  color: #9ca3af;
}

/* Course grid */
.stm-course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.25rem;
  transition: opacity 0.2s ease;
}

/* Course card */
.stm-course-card {
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.stm-course-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.stm-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.stm-card-thumb img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  display: block;
}

.stm-thumb-placeholder {
  width: 100%;
  height: 140px;
  background: #e0e7ff;
}

.stm-card-body {
  padding: 12px 14px;
}

.stm-cat-tag {
  font-size: 11px;
  font-weight: 600;
  color: #4338ca;
  background: #eef2ff;
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 6px;
}

.stm-card-title {
  font-size: 14px;
  font-weight: 600;
  color: #111827;
  margin: 0 0 8px;
  line-height: 1.4;
}

.stm-card-meta {
  font-size: 12px;
  color: #6b7280;
  display: flex;
  align-items: center;
  gap: 6px;
}

.stm-meta-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #d1d5db;
  display: inline-block;
}

.stm-price {
  color: #059669;
  font-weight: 600;
}

.stm-no-courses {
  grid-column: 1 / -1;
  text-align: center;
  color: #9ca3af;
  padding: 3rem 0;
}

/* Responsive */
@media (max-width: 768px) {
  .stm-archive-wrap {
    flex-direction: column;
  }
  .stm-cat-sidebar {
    width: 100%;
    position: static;
    border-right: none;
    border-bottom: 1px solid #e5e7eb;
    padding-right: 0;
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
  }
  .stm-course-main {
    padding-left: 0;
  }
  .stm-cat-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }
  .stm-cat-link {
    border-left: none;
    border: 1px solid #e5e7eb;
    border-radius: 999px;
    padding: 5px 12px;
    font-size: 13px;
  }
  .stm-cat-link.active {
    border-color: #6366f1;
    background: #eef2ff;
  }
}