/* OVERLAY BASE STYLES  */
/* ==================== */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
  overflow-y: auto;
}

.overlay.active {
  opacity: 1;
  visibility: visible;
}

.overlay-close {
  position: fixed;
  top: 2rem;
  right: 3rem;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  font-size: 0.875rem;
  font-family: var(--font-sans);
  z-index: 201;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: opacity 0.3s ease;
}

.overlay-close:hover {
  opacity: 0.6;
}

.overlay-close svg {
  width: 14px;
  height: 14px;
}

/* ✅ 페이지(standalone)에서도 그대로 쓸 수 있도록 기본값은 "보이게" */
.overlay-content {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 3rem 4rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* ✅ 오버레이 안에서만 fade/slide 애니메이션을 적용 */
.overlay .overlay-content {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease 0.2s, transform 0.6s ease 0.2s;
}

.overlay.active .overlay-content {
  opacity: 1;
  transform: translateY(0);
}

.overlay-header {
  margin-bottom: 4rem;
}

.overlay-title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.overlay-title em {
  font-style: italic;
}

.overlay-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 600px;
  line-height: 1.7;
}

.overlay-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  margin-top: 2rem;
}

.overlay-grid.single-column {
  grid-template-columns: 1fr;
  max-width: 800px;
}

.overlay-section {
  margin-bottom: 3rem;
}

.overlay-section h3 {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

.overlay-section p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.overlay-section ul {
  list-style: none;
  padding: 0;
}

.overlay-section li {
  font-size: 1rem;
  line-height: 2;
  color: var(--color-text-muted);
  padding-left: 1rem;
  position: relative;
}

.overlay-section li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-text-muted);
  opacity: 0.5;
}

/* Professor Photo Styles */
.professor-header {
  display: flex;
  align-items: flex-start;
  gap: 3rem;
}

.professor-photo-wrapper {
  flex-shrink: 0;
}

.professor-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
}

.professor-header-text {
  flex: 1;
}