/* ==========================================================================
   OASK Publishers - Common Header Styles
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--white);
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 20px;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-logo img {
  height: 68px;
  width: auto;
  object-fit: contain;
}

/* Main Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-item {
  position: relative;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.84375rem;
  /* ~13.5px */
  font-weight: 700;
  color: var(--dark-navy-blue);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 8px 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--accent-orange);
}

.nav-item.active > .nav-link,
.nav-item.active .nav-link {
  color: var(--dark-navy-blue);
}

.nav-item.active > .nav-link::after,
.nav-item.active .nav-link::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2.5px;
  background-color: var(--accent-orange);
  border-radius: 2px;
}

.nav-link .dropdown-icon {
  font-size: 0.625rem;
  transition: transform var(--transition-fast);
  color: var(--text-muted);
}

.nav-item:hover .dropdown-icon {
  transform: translateY(1px);
  color: var(--accent-orange);
}

/* Active Nav Item */
.nav-link.active {
  color: var(--accent-orange);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2.5px;
  background-color: var(--accent-orange);
  border-radius: 2px;
}

/* Dropdown Menu */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background-color: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  z-index: 100;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown li a {
  display: block;
  padding: 8px 18px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-dark);
  transition: all var(--transition-fast);
}

.nav-dropdown li a:hover {
  background-color: var(--bg-light-blue);
  color: var(--primary-blue);
  padding-left: 22px;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.header-search-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dark-navy-blue);
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
}

.header-search-btn:hover {
  background-color: var(--bg-light-blue);
  color: var(--primary-blue);
}

.header-submit-btn {
  background-color: var(--accent-orange);
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.8125rem;
  padding: 9px 18px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 6px rgba(246, 130, 19, 0.2);
}

.header-submit-btn:hover {
  background-color: #e0720a;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(246, 130, 19, 0.3);
}

/* Hamburger Toggle */
.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  color: var(--dark-navy-blue);
  font-size: 1.25rem;
}

.mobile-menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--dark-navy-blue);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

/* Mobile Drawer */
.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(16, 42, 82, 0.5);
  backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 1050;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  max-width: 85vw;
  height: 100vh;
  height: 100dvh;
  max-height: 100vh;
  max-height: 100dvh;
  background-color: var(--white);
  box-shadow: -5px 0 25px rgba(0, 0, 0, 0.15);
  display: flex;
  flex-direction: column;
  transition: right var(--transition-normal);
  z-index: 1060;
  overflow: hidden;
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
  background-color: var(--white);
}

.mobile-drawer-header img {
  height: 38px;
}

.mobile-drawer-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  color: var(--text-dark);
}

.mobile-drawer-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding: 20px;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav-item {
  position: relative;
}

.mobile-nav-link {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--dark-navy-blue);
  padding: 10px 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
  cursor: pointer;
  user-select: none;
  transition: color var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--accent-orange);
}

.mobile-nav-item.active > .mobile-nav-link,
.mobile-nav-link.active {
  color: var(--accent-orange);
  background: linear-gradient(90deg, rgba(246, 130, 19, 0.12), rgba(246, 130, 19, 0.04));
  border-radius: 6px;
  padding-left: 10px;
  padding-right: 10px;
  box-shadow: inset 0 0 0 1px rgba(246, 130, 19, 0.18);
}

.mobile-nav-item.active > .mobile-nav-link::after,
.mobile-nav-link.active::after {
  content: '';
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 2px;
  background-color: var(--accent-orange);
  border-radius: 2px;
}

.mobile-nav-link .dropdown-arrow {
  font-size: 0.75rem;
  color: #7E93B0;
  transition: transform 0.25s ease, color 0.25s ease;
}

.mobile-nav-item.open > .mobile-nav-link,
.mobile-nav-link.open {
  color: var(--primary-blue);
}

.mobile-nav-item.open > .mobile-nav-link .dropdown-arrow,
.mobile-nav-link.open .dropdown-arrow {
  transform: rotate(180deg);
  color: var(--primary-blue);
}

/* Mobile Accordion Submenu */
.mobile-submenu {
  display: none;
  background-color: #F4F8FC;
  border-radius: 8px;
  margin: 6px 0 10px;
  padding: 6px 0;
  list-style: none;
  border-left: 3px solid var(--primary-blue);
}

.mobile-submenu.show,
.mobile-nav-item.open > .mobile-submenu {
  display: block;
  animation: mobileSubmenuFade 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.mobile-submenu li a {
  display: block;
  padding: 8px 16px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-dark);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.mobile-submenu li a:hover {
  color: var(--primary-blue);
  padding-left: 20px;
  background-color: rgba(40, 102, 177, 0.08);
}

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

.mobile-drawer-footer {
  flex-shrink: 0;
  padding: 16px 20px;
  padding-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  background-color: var(--white);
  border-top: 1px solid var(--border-light);
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.03);
  position: relative;
  z-index: 2;
}

.mobile-drawer-footer .header-submit-btn {
  width: 100%;
  min-height: 44px;
  padding: 11px 20px;
  font-size: 0.875rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  text-align: center;
}

/* Open states */
body.mobile-drawer-open {
  overflow: hidden;
}

body.mobile-drawer-open .mobile-drawer-overlay {
  opacity: 1;
  visibility: visible;
}

body.mobile-drawer-open .mobile-drawer {
  right: 0;
}

/* Tablet & Mobile Media Queries */
@media (max-width: 1024px) {
  .nav-list {
    gap: 16px;
  }

  .nav-link {
    font-size: 0.8125rem;
  }

  .header-submit-btn {
    padding: 8px 14px;
    font-size: 0.75rem;
  }
}

@media (max-width: 860px) {
  .main-nav {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .header-inner {
    height: 64px;
  }

  .site-logo img {
    height: 56px;
  }

  .header-actions .header-submit-btn {
    display: none;
  }
}