/* ===================================
   Newsletter List (뉴스레터 갤러리형 목록)
   의존: common.css, components.css, sub-page.css

   스타일가이드 참조:
   - colors.md → CSS Variables (common.css :root)
   - typography.md → --fs-*, --fw-*, --ls, --lh-*
   - layout.md → container, gap, responsive breakpoints
   =================================== */

/* ===================================
   Gallery Grid
   =================================== */
.newsletter-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8) var(--space-6);
  align-items: start;
}

/* ===================================
   Newsletter Card
   =================================== */
.newsletter-card,
.newsletter-card:hover,
.newsletter-card:visited,
.newsletter-card:active {
  display: block;
  min-width: 0;
  text-decoration: none;
  color: inherit;
}

.newsletter-card:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 2px;
  border-radius: var(--radius-md);
}

/* 썸네일 */
.newsletter-card__thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-gray-100);
  border: 1px solid var(--color-gray-300);
}

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

/* 썸네일 hover 오버레이 */
.newsletter-card__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  background: rgba(0, 0, 0, 0.45);
  border-radius: var(--radius-md);
  opacity: 0;
  transition: opacity 0.25s ease;
  z-index: 1;
}

.newsletter-card:hover .newsletter-card__overlay {
  opacity: 1;
}

.newsletter-card__overlay-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-width: 100px;
  padding: var(--space-3) var(--space-5);
  border: 1px solid var(--color-white);
  border-radius: var(--radius-md);
  background: transparent;
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: #fff;
  letter-spacing: var(--ls);
  cursor: pointer;
  text-decoration: none;
}

.newsletter-card__overlay-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

.newsletter-card__overlay-btn .icon {
  width: 16px;
  height: 16px;
}

/* 썸네일 없을 때 대체 */
.newsletter-card__thumb--empty {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-gray-100);
}

.newsletter-card__thumb--empty .newsletter-card__placeholder {
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--color-gray-400);
  letter-spacing: var(--ls);
}

.newsletter-card:hover .newsletter-card__placeholder {
  display: none;
}

/* 카드 텍스트 영역 */
.newsletter-card__body {
  padding: var(--space-4) var(--space-1) var(--space-2);
}

.newsletter-card__vol {
  display: inline-block;
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--color-primary-700);
  letter-spacing: var(--ls);
  margin-bottom: 6px;
}

.newsletter-card__title {
  font-size: var(--fs-block);
  font-weight: var(--fw-medium);
  color: var(--color-gray-900);
  line-height: var(--lh-heading);
  letter-spacing: var(--ls);
  margin-bottom: var(--space-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.newsletter-card__date {
  font-size: var(--fs-small);
  font-weight: var(--fw-regular);
  color: var(--color-gray-600);
  letter-spacing: var(--ls);
}

/* ===================================
   Responsive: Tablet (768px ~ 1199px)
   =================================== */
@media (max-width: 1023px) {
  .newsletter-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px var(--space-5);
  }
}

/* ===================================
   Responsive: Mobile (0 ~ 767px)
   =================================== */
@media (max-width: 767px) {
  .newsletter-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5) var(--space-4);
  }

  .newsletter-card__body {
    padding: var(--space-3) 2px 6px;
  }

  .newsletter-card__title {
    font-size: var(--fs-small);
  }

  .newsletter-card__vol,
  .newsletter-card__date {
    font-size: var(--fs-small);
  }
}

@media (max-width: 479px) {
  .newsletter-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

/* ===================================
   검색 폼 반응형 — board-search 독립 박스 전용
   components.css board-search__row의 align-items: flex-end 를
   뉴스레터 컨텍스트에서 center로 교체하고,
   좁은 화면에서 column + full-width를 보장
   =================================== */
.board-list .board-search .board-search__row {
  flex-direction: row;
  align-items: center;
  flex-wrap: nowrap;
}

.board-list .board-search .board-search__row .board-search__input-group {
  flex: 1 1 auto;
  min-width: 0;
  max-width: none;
}

@media (max-width: 767px) {
  .board-list .board-search .board-search__row {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }

  .board-list .board-search .board-search__row .board-search__input-group,
  .board-list .board-search .board-search__row .board-search__btn {
    flex: 0 0 auto;
    min-width: 0;
    width: 100%;
    max-width: none;
  }
}

/* ===================================
   Print
   =================================== */
@media print {
  .newsletter-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-2);
  }

  .newsletter-card {
    break-inside: avoid;
  }
}