/* ── Teaching page ── */

.teaching-section {
  padding: 2.5rem 0 3rem;
}

.course-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 12px;
  transition: border-color 0.2s;
}

.course-card:hover { border-color: var(--border-mid); }
.course-card:last-child { margin-bottom: 0; }

.course-card-top {
  display: grid;
  grid-template-columns: 1fr 220px;
  min-height: 200px;
}

.course-main {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.course-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.course-header h2 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--gray-900);
  line-height: 1.3;
}

.inst-logo {
  height: 28px;
  width: auto;
  flex-shrink: 0;
  opacity: 0.85;
  margin-top: 3px;
}

.course-number {
  font-size: 0.8rem;
  color: var(--gray-400);
  font-family: var(--font-mono, monospace);
}

.course-main p {
  font-size: 0.92rem;
  color: var(--gray-600);
  line-height: 1.75;
}

.course-meta-row {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.course-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.course-meta-label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gray-400);
}

.course-meta-value {
  font-size: 0.88rem;
  color: var(--gray-900);
}

.course-img {
  border-left: 1px solid var(--border);
  overflow: hidden;
  background: var(--blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.course-img-warm { background: #f0f4f8; }

.course-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ── Responsive ── */
@media (max-width: 700px) {
  .course-card-top {
    grid-template-columns: 1fr;
  }

  .course-img {
    height: 140px;
    border-left: none;
    border-top: 1px solid var(--border);
  }

  .course-header {
    flex-direction: column;
    gap: 0.4rem;
  }

  .course-meta-row {
    gap: 1.25rem;
  }
}