/* ============================================================
   main.css — index.html 전용 스타일
   ============================================================ */

/* ── Main Hero ──────────────────────────────────────────────── */
.main-hero {
  position: relative;
  height: 870px;
  display: flex;
  align-items: center;
  background: linear-gradient(to bottom, #001f3f, #000613);
  overflow: hidden;
  padding-top: 72px;
  /* fixed-top navbar 높이 보정 */
}

/* .hero-bg-img 기본은 style.css — 여기선 필터만 */
.main-hero .hero-bg-img {
  filter: grayscale(1) brightness(0.4);
  opacity: 0.4;
}

.main-hero .hero-content {
  position: relative;
  z-index: 10;
}

/* 종이 질감 오버레이 */
.main-hero .texture-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.03;
  background: url('https://www.transparenttextures.com/patterns/natural-paper.png');
  z-index: 5;
}

.hero-tag {
  display: inline-block;
  padding: 0.375rem 1rem;
  background-color: rgba(119, 90, 25, 0.2);
  color: #e9c176;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: 50rem;
  margin-bottom: 1.5rem;
}

.main-hero-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  color: #ffffff;
  line-height: 1.1;
  letter-spacing: -0.03em;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero-description {
  font-size: 1.25rem;
  color: #cbd5e1;
  max-width: 600px;
  font-weight: 300;
  line-height: 1.6;
}

/* ── Quick Cards ─────────────────────────────────────────────── */
.quick-cards-wrapper {
  position: relative;
  margin-top: -4rem;
  z-index: 20;
}

.quick-card {
  background: #fff;
  padding: 2rem;
  border-radius: 0.75rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, background-color 0.3s;
  text-decoration: none;
  display: flex;
  align-items: center;
  color: inherit;
}

.quick-card:hover {
  transform: scale(1.02);
  background-color: var(--surface-container-low);
  color: inherit;
}

.icon-box {
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-right: 1.5rem;
  transition: background-color 0.3s, color 0.3s;
  font-size: 1.5rem;
}

.icon-gold {
  background-color: var(--gold-light);
  color: var(--secondary-gold);
}

.icon-navy {
  background-color: #d4e3ff;
  color: #476083;
}

.quick-card:hover .icon-gold {
  background-color: var(--secondary-gold);
  color: #fff;
}

.quick-card:hover .icon-navy {
  background-color: var(--primary-navy);
  color: #fff;
}

/* ── Latest Updates ─────────────────────────────────────────── */
.section-tag {
  color: var(--secondary-gold);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.news-item {
  padding: 1.5rem;
  border-radius: 0.75rem;
  transition: background-color 0.3s;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.news-item:hover {
  background-color: var(--surface-container-low);
}

.news-item:hover h4 {
  color: var(--secondary-gold);
}

/* news-item 내 chevron: 평소엔 숨기고 hover 시 노출 */
.news-item .news-chevron {
  opacity: 0;
  transition: opacity 0.2s;
}

.news-item:hover .news-chevron {
  opacity: 1;
}

/* ── Album Swiper ─────────────────────────────────────────────── */
.album-swiper {
  overflow: hidden;
}

.album-thumb {
  position: relative;
  height: 300px;
  overflow: hidden;
}


.album-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.swiper-slide:hover .album-thumb-img {
  transform: scale(1.05);
}

.album-thumb-info {
  position: absolute;
  inset: auto 0 0 0;
  padding: 2.5rem 1rem 0.875rem;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.72));
  color: #fff;
}

.album-thumb-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin-bottom: 0.375rem;
}

.album-thumb-date {
  font-size: 0.9375rem;
  opacity: 0.8;
}

/* 내비게이션: 기본 숨김, 슬라이더 hover 시 표시 */
.album-swiper .swiper-button-prev,
.album-swiper .swiper-button-next {
  width: 2.25rem;
  height: 2.25rem;
  background: rgba(0, 0, 0, 0.45);
  border-radius: 50%;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  color: #fff;
  opacity: 0;
  transition: opacity 0.25s ease, background 0.25s ease;
}

.album-swiper .swiper-button-prev::after,
.album-swiper .swiper-button-next::after {
  font-size: 0.75rem;
  font-weight: 800;
}

.album-swiper:hover .swiper-button-prev,
.album-swiper:hover .swiper-button-next {
  opacity: 1;
}

.album-swiper .swiper-button-prev:hover,
.album-swiper .swiper-button-next:hover {
  background: rgba(0, 0, 0, 0.65);
}

/* ── News Board ───────────────────────────────────────────────── */
.news-board-card {
  background: #fff;
  border-radius: 0.75rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.news-board-section {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--border-color);
}

.news-board-section:last-child {
  border-bottom: none;
}

.news-board-label {
  flex-shrink: 0;
  width: 110px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.25rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: opacity 0.2s;
}

.news-board-label:hover {
  opacity: 0.85;
}

.news-board-label i {
  font-size: 1.125rem;
}

.news-board-label.navy {
  background-color: var(--primary-container);
  color: #d4e3ff;
}

.news-board-label.gold {
  background-color: var(--accent-gold);
  color: #5a3e00;
}

.news-board-list {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.news-board-item {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.875rem 1.25rem;
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid var(--surface-container);
  transition: background-color 0.2s;
  min-width: 0;
}

.news-board-item:last-child {
  border-bottom: none;
}

.news-board-item:hover {
  background-color: var(--surface-container-low);
}

.news-board-title {
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.4;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.news-board-item:hover .news-board-title {
  color: var(--secondary-gold);
}

.news-board-date {
  flex-shrink: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.news-badge-new {
  display: inline-block;
  background-color: #e07b3a;
  color: #fff;
  font-size: 0.65rem;
  font-weight: 800;
  padding: 0.1em 0.4em;
  border-radius: 0.25rem;
  vertical-align: middle;
  margin-left: 0.3rem;
  line-height: 1.6;
}

.news-board-empty {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 1.5rem;
}

/* ── Academic Highlight Cards ────────────────────────────────── */
.academic-card {
  background: #fff;
  padding: 2.5rem;
  border-radius: 0.75rem;
  height: 100%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.academic-card i {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  display: block;
}

.academic-card a {
  color: inherit;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color 0.2s;
}

.academic-card a:hover {
  color: var(--secondary-gold);
}