/* BKIG — Navigation / Header only (load after style.css for --vars) */

/* Header — Hero: transparent + white. From Participating Universities: glass + navy */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  box-shadow: none;
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #e2e8f0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  position: relative;
}

.logo-img {
  height: 52px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: opacity 0.3s ease;
}

.logo-img-scrolled {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0;
  pointer-events: none;
}

.header.scrolled .logo-img-default {
  opacity: 0;
  pointer-events: none;
}

.header.scrolled .logo-img-scrolled {
  opacity: 1;
  pointer-events: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav .nav-link,
.nav a.nav-link,
.nav .nav-dropdown-trigger,
.nav .nav-dropdown-item {
  cursor: pointer !important;
}

.nav-link {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.3s ease, text-decoration 0.2s ease;
  cursor: pointer !important;
}

.nav-link:hover {
  color: var(--color-text);
  text-decoration: underline;
}

.header.scrolled .nav-link {
  color: #000;
}

.header.scrolled .nav-link:hover {
  color: #000;
  text-decoration: underline;
}

/* Join us dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  background: none;
  border: none;
  cursor: pointer !important;
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0;
  display: inline-flex;
  align-items: center;
  color: inherit;
  -webkit-appearance: none;
  appearance: none;
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  margin-top: 0;
  min-width: 200px;
  padding: 0.5rem 0;
  background: rgba(15, 23, 42, 0.98);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease 0.35s, visibility 0.2s ease 0.35s, transform 0.2s ease;
  z-index: 200;
  pointer-events: none;
  text-align: center;
}

.nav-dropdown-menu::before {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  height: 12px;
}

.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
  transition-delay: 0s;
}

.header.scrolled .nav-dropdown-menu {
  background: #ffffff;
  border-color: #e2e8f0;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
}

.nav-dropdown-item {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, text-decoration 0.2s ease;
  white-space: nowrap;
  text-align: center;
  cursor: pointer !important;
}

.nav-dropdown-item:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  text-decoration: underline;
}

.header.scrolled .nav-dropdown-item {
  color: #000;
}

.header.scrolled .nav-dropdown-item:hover {
  background: #f1f5f9;
  color: #000;
  text-decoration: underline;
}

.nav-dropdown.is-open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.nav-search {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: 8px;
  transition: color 0.3s ease, background 0.3s ease;
}

.nav-search:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.08);
}

.header.scrolled .nav-search {
  color: #000;
}

.header.scrolled .nav-search:hover {
  color: #000;
  background: rgba(0, 0, 0, 0.06);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  transition: color 0.3s ease;
}

.header.scrolled .menu-toggle {
  color: #000;
}

.menu-toggle span {
  display: block;
  height: 2px;
  background: currentColor;
  width: 22px;
  border-radius: 1px;
}

/* Mobile — Nav & Header */
@media (max-width: 900px) {
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
    background: rgba(8, 12, 24, 0.98);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    display: block;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    cursor: pointer;
  }

  .nav-dropdown {
    display: block;
  }

  .nav-dropdown-trigger {
    width: 100%;
    justify-content: flex-start;
    padding: 0.75rem 1.5rem;
    text-align: left;
    cursor: pointer;
  }

  .nav-dropdown-menu {
    position: static;
    transform: none;
    margin-top: 0;
    margin-left: 1.5rem;
    min-width: auto;
    padding: 0 0 0.5rem;
    background: transparent;
    border: none;
    box-shadow: none;
    display: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-dropdown.is-open .nav-dropdown-menu {
    display: block;
  }

  .nav-dropdown-item {
    padding: 0.5rem 0 0.5rem 0.5rem;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.85);
    cursor: pointer;
  }

  .nav-dropdown-item:hover {
    background: transparent;
    color: #fff;
  }

  .nav-search {
    margin: 0.5rem 1.5rem 0;
    align-self: flex-start;
  }

  .menu-toggle {
    display: flex;
  }

  .menu-toggle.is-active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .menu-toggle.is-active span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.is-active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .menu-toggle span {
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  body.menu-open {
    overflow: hidden;
  }

  .header {
    padding: 0 1.25rem;
  }

  .logo-img {
    height: 42px;
  }

  /* ========== New mobile overlay (fintech full-screen) ========== */
  .mobile-nav-overlay {
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    background-color: rgba(2, 6, 23, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
  }

  .mobile-nav-overlay.is-open {
    opacity: 1;
    visibility: visible;
  }

  .mobile-nav-overlay .mobile-nav-item {
    transition: opacity 0.4s ease, transform 0.4s ease;
    transition-delay: 0s;
  }

  .mobile-nav-overlay.is-open .mobile-nav-item {
    opacity: 1;
    transform: translateY(0);
  }

  .mobile-nav-overlay.is-open .mobile-nav-item:nth-child(1) { transition-delay: 0.05s; }
  .mobile-nav-overlay.is-open .mobile-nav-item:nth-child(2) { transition-delay: 0.1s; }
  .mobile-nav-overlay.is-open .mobile-nav-item:nth-child(3) { transition-delay: 0.15s; }
  .mobile-nav-overlay.is-open .mobile-nav-item:nth-child(4) { transition-delay: 0.2s; }
  .mobile-nav-overlay.is-open .mobile-nav-item:nth-child(5) { transition-delay: 0.25s; }
  .mobile-nav-overlay.is-open .mobile-nav-item:nth-child(6) { transition-delay: 0.3s; }
  .mobile-nav-overlay.is-open .mobile-nav-item:nth-child(7) { transition-delay: 0.35s; }
  .mobile-nav-overlay.is-open .mobile-nav-item:nth-child(8) { transition-delay: 0.4s; }
  .mobile-nav-overlay.is-open .mobile-nav-item:nth-child(9) { transition-delay: 0.45s; }

  .mobile-nav-accordion-panel {
    max-height: 0;
    transition: max-height 0.35s ease;
  }

  .mobile-nav-accordion.is-open .mobile-nav-accordion-panel {
    max-height: 220px;
  }

  .mobile-nav-accordion-trigger[aria-expanded="true"] {
    font-weight: 500;
    color: #fff;
  }

  /* 작은 화면(예: iPhone SE)에서 메뉴 글씨 크기·간격 축소 */
  @media (max-width: 400px), (max-height: 640px) {
    .mobile-nav-list .mobile-nav-item a,
    .mobile-nav-list .mobile-nav-accordion-trigger {
      font-size: 1rem;
      padding-top: 0.5rem;
      padding-bottom: 0.5rem;
    }
    .mobile-nav-list .mobile-nav-accordion-panel a {
      font-size: 0.9375rem;
    }
    .mobile-nav-list > div {
      padding-top: 0.75rem;
      padding-bottom: 0.75rem;
    }
  }
}

@media (min-width: 901px) {
  .mobile-nav-overlay {
    display: none !important;
  }
}

/* ========== Footer (Dark) ========== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.footer {
  background: #020617;
  color: #94a3b8;
  font-family: var(--font-sans);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3.5rem 2rem 2.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-brand .footer-logo-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  margin-bottom: 0.75rem;
  text-decoration: none;
}

.footer-logo-img {
  height: 40px;
  width: auto;
  display: block;
  object-fit: contain;
}

.footer-logo-text {
  display: none;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: #ffffff;
  font-family: var(--font-sans);
}

.footer-slogan {
  font-size: 0.875rem;
  margin: 0 0 1.25rem;
  color: #94a3b8;
  transition: color 0.25s ease;
}

.footer-brand:hover .footer-slogan {
  color: #ffffff;
}

.footer-social {
  display: flex;
  gap: 0.75rem;
}

.footer-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: #94a3b8;
  border-radius: 8px;
  transition: color 0.25s ease, background 0.25s ease;
}

.footer-social-link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
}

.footer-title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #94a3b8;
  margin: 0 0 1rem;
}
.footer-title--bold {
  font-weight: 700;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links li {
  margin: 0;
}

.footer-link {
  display: inline-block;
  font-size: 0.875rem;
  color: #94a3b8;
  text-decoration: none;
  padding: 0.35rem 0;
  transition: color 0.25s ease, transform 0.25s ease;
}

.footer-link:hover {
  color: #ffffff;
  transform: translateX(4px);
}

.footer-subscribe .footer-title {
  margin-bottom: 0.75rem;
}

.footer-form {
  display: flex;
  gap: 0;
  width: 100%;
  max-width: 300px;
}

.footer-input {
  flex: 1;
  min-width: 0;
  height: 44px;
  padding: 0 1rem;
  font-size: 0.875rem;
  font-family: var(--font-sans);
  color: #f1f5f9;
  background: #1e293b;
  border: none;
  border-radius: 8px 0 0 8px;
  transition: box-shadow 0.25s ease;
}

.footer-input::placeholder {
  color: #64748b;
}

.footer-input:focus {
  outline: none;
  box-shadow: 0 0 0 2px #3b82f6;
}

.footer-submit {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: #334155;
  border: none;
  border-radius: 0 8px 8px 0;
  color: #94a3b8;
  cursor: pointer;
  transition: color 0.25s ease, background 0.25s ease;
}

.footer-submit:hover {
  color: #ffffff;
  background: #475569;
}

.footer-submit:focus {
  outline: none;
  box-shadow: 0 0 0 2px #3b82f6;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
}

.footer-bottom-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.8125rem;
  color: #64748b;
}

.footer-credit {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem 1.25rem;
  font-size: 0.8125rem;
  color: #64748b;
  text-align: right;
}

.footer-legal {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8125rem;
}

.footer-legal-link {
  color: #94a3b8;
  text-decoration: none;
  transition: color 0.25s ease;
}

.footer-legal-link:hover {
  color: #ffffff;
}

.footer-legal-sep {
  color: #475569;
  user-select: none;
}

/* Footer — Mobile */
@media (max-width: 900px) {
  .footer-inner {
    padding: 2.5rem 1.25rem 2rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .footer-col {
    align-items: flex-start;
    margin-bottom: 2.5rem;
  }

  .footer-col:last-of-type {
    margin-bottom: 0;
  }

  .footer-links {
    gap: 0.625rem;
  }

  .footer-links .footer-link {
    padding: 0.5rem 0;
  }

  .footer-form {
    max-width: 100%;
  }

  .footer-bottom-inner {
    padding: 1rem 1.25rem;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
  }

  .footer-legal {
    justify-content: center;
  }

  .footer-credit {
    padding: 0 1.25rem 1rem;
  }
}