/* ==========================================================================
   Layout Styles - Metallic Official Navy Edition
   공통 헤더, GNB, 메가메뉴, LNB 사이드바, 푸터, 컨테이너 레이아웃
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--color-text-main);
  background-color: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Top Utility Bar */
.top-utility-bar {
  background: var(--color-primary-dark);
  color: #94a3b8;
  font-size: var(--font-size-xs);
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-utility-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-announcement {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: #cbd5e1;
}

.top-links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.top-links a {
  color: #cbd5e1;
  transition: color var(--transition-fast);
}

.top-links a:hover {
  color: #ffffff;
}

.top-links .divider {
  color: rgba(255, 255, 255, 0.2);
}

/* Main Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 3px solid var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(10, 25, 47, 0.06);
}

.main-nav-bar {
  height: 82px;
  display: flex;
  align-items: center;
}

.main-nav-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand-logo img {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.header-bk21-banner {
  display: flex;
  align-items: center;
  border-left: 1px solid var(--color-border);
  padding-left: 16px;
}

.header-bk21-banner img {
  height: 24px;
  width: auto;
  opacity: 0.85;
}

@media (max-width: 1100px) {
  .header-bk21-banner {
    display: none;
  }
}

/* Desktop GNB */
.gnb-menu {
  display: flex;
  gap: 36px;
  height: 100%;
  align-items: center;
}

.gnb-item {
  position: relative;
  height: 82px;
  display: flex;
  align-items: center;
}

.gnb-link {
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-text-main);
  padding: 8px 0;
  position: relative;
  transition: color var(--transition-fast);
}

.gnb-link:hover, .gnb-item.active .gnb-link {
  color: var(--color-primary);
}

.gnb-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--color-primary);
  transition: width var(--transition-fast);
}

.gnb-link:hover::after, .gnb-item.active .gnb-link::after {
  width: 100%;
}

/* GNB Dropdown */
.gnb-dropdown {
  position: absolute;
  top: 82px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  padding: var(--space-2) 0;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 1010;
}

.gnb-item:hover .gnb-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.gnb-dropdown a {
  display: block;
  padding: 10px var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-main);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.gnb-dropdown a:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  padding-left: var(--space-5);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-megamenu {
  background: #f8fafc;
  color: var(--color-primary);
  font-weight: 700;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.btn-megamenu:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
}

.btn-classnet {
  background: var(--color-primary);
  color: #ffffff;
  font-weight: 700;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: var(--font-size-sm);
  transition: background var(--transition-fast);
}

.btn-classnet:hover {
  background: var(--color-primary-dark);
}

/* Mega Menu Modal Overlay (Full-screen University Hub) */
.hongik-megamenu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 25, 47, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 3000;
  color: #ffffff;
  overflow-y: auto;
  padding: 40px 0 60px;
}

.hongik-megamenu-overlay.open {
  display: block;
  animation: megaOverlayFade 0.25s ease-out;
}

@keyframes megaOverlayFade {
  from { opacity: 0; transform: scale(0.99); }
  to { opacity: 1; transform: scale(1); }
}

.megamenu-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.megamenu-close-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.megamenu-close-btn:hover {
  background: var(--color-accent);
  color: #ffffff;
  transform: rotate(90deg);
}

.megamenu-tabs {
  display: flex;
  gap: 36px;
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 36px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 14px;
}

.megamenu-tab {
  color: #94a3b8;
  cursor: pointer;
  position: relative;
  padding-bottom: 14px;
  transition: color var(--transition-fast);
}

.megamenu-tab:hover {
  color: #cbd5e1;
}

.megamenu-tab.active {
  color: #ffffff;
}

.megamenu-tab.active::after {
  content: '';
  position: absolute;
  bottom: -15px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--color-accent);
}

/* Tab Panels */
.megamenu-panel {
  display: none;
}

.megamenu-panel.active {
  display: block;
  animation: megaPanelFade 0.2s ease-out;
}

@keyframes megaPanelFade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Panel 1: Complete Sitemap Grid */
.megamenu-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 28px;
}

.megamenu-col-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.25);
  letter-spacing: -0.2px;
}

.megamenu-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.megamenu-links a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 14px;
  transition: all var(--transition-fast);
}

.megamenu-links a:hover {
  color: #ffffff;
  transform: translateX(4px);
}

/* Panel 2: Visitor-Oriented 4-Column Grid */
.megamenu-visitor-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.visitor-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 24px;
  transition: border-color var(--transition-fast);
}

.visitor-card:hover {
  border-color: var(--color-accent);
  background: rgba(255, 255, 255, 0.07);
}

.visitor-card-header {
  font-size: 16px;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.visitor-card-desc {
  font-size: 12px;
  color: #94a3b8;
  margin-bottom: 18px;
  line-height: 1.5;
}

/* Panel 3: Quick Services & External Hub */
.megamenu-shortcut-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.shortcut-box {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.shortcut-box:hover {
  background: rgba(217, 119, 6, 0.12);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.shortcut-name {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.shortcut-desc {
  font-size: 12px;
  color: #94a3b8;
}

.shortcut-arrow {
  color: var(--color-accent);
  font-size: 18px;
  font-weight: 700;
}

/* Subpage Hero Banner (Bright Official University Style) */
.subpage-banner {
  background: linear-gradient(135deg, #f8fafc 0%, #edf2f7 50%, #f1f5f9 100%);
  color: #0f172a;
  padding: 44px 0 36px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid #e2e8f0;
}

.subpage-banner::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 32%;
  background: radial-gradient(circle, rgba(14, 116, 144, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.subpage-banner-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  color: #b45309;
  background: #fef3c7;
  border: 1px solid #fde68a;
  border-radius: 4px;
  padding: 3px 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: var(--space-2);
}

.subpage-banner-title {
  font-size: 32px;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: var(--space-2);
  line-height: 1.25;
  letter-spacing: -0.5px;
}

.subpage-banner-desc {
  font-size: 15px;
  color: #475569;
  max-width: 720px;
  line-height: 1.6;
}

/* Breadcrumb */
.breadcrumb-area {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.breadcrumb-item:hover {
  color: var(--color-primary);
}

.breadcrumb-item.current {
  color: var(--color-primary);
  font-weight: 700;
}

.breadcrumb-sep {
  color: var(--color-text-subtle);
}

/* 2-Column Subpage Layout */
.subpage-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-8);
  padding: var(--space-10) 0 var(--space-16);
}

/* LNB Sidebar */
.lnb-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.lnb-header {
  background: var(--color-primary);
  color: #ffffff;
  padding: var(--space-5) var(--space-5);
  border-bottom: 3px solid var(--color-accent);
}

.lnb-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 800;
  margin-bottom: 2px;
}

.lnb-header p {
  font-size: var(--font-size-xs);
  color: #cbd5e1;
}

.lnb-list {
  padding: var(--space-2) 0;
}

.lnb-item a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-main);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: all var(--transition-fast);
}

.lnb-item:last-child a {
  border-bottom: none;
}

.lnb-item a:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  padding-left: var(--space-6);
}

.lnb-item.active a {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: 800;
  border-left: 4px solid var(--color-primary);
}

.lnb-arrow {
  font-size: 14px;
  color: var(--color-text-subtle);
  transition: transform var(--transition-fast);
}

.lnb-item a:hover .lnb-arrow, .lnb-item.active a .lnb-arrow {
  color: var(--color-primary);
  transform: translateX(3px);
}

/* Global Footer */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-10) 0 var(--space-6);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.footer-info-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-univ-name {
  font-size: var(--font-size-base);
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 8px;
}

.footer-bottom-strip {
  background: var(--color-primary-dark);
  color: #94a3b8;
  padding: 16px 0;
  font-size: var(--font-size-xs);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-bottom-strip .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Responsive */
@media (max-width: 1024px) {
  .subpage-layout {
    grid-template-columns: 1fr;
  }
  .gnb-menu {
    display: none;
  }
  .megamenu-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 640px) {
  .megamenu-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-bottom-strip .container {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}