.header { position: sticky; top: 0; z-index: 1000; background: #0d1b2a; transition: box-shadow 0.3s; }
.header.scrolled { box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4); }
.header .header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.header .header-logo { display: flex; align-items: center; }
.header .header-logo-img { height: 32px; width: auto; }
.header .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #1D3557; border-top: 1px solid rgba(69, 123, 157, 0.3); padding: 16px 0; }
.header .nav.active { display: block; }
.header .nav-list { display: flex; flex-direction: column; }
.header .nav-item { border-bottom: 1px solid rgba(69, 123, 157, 0.15); }
.header .nav-link { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; font-size: 15px; font-weight: 600; color: #e0e0e0; transition: color 0.2s, background 0.2s; }
.header .nav-link:hover { color: #A8DADC; background: rgba(69, 123, 157, 0.15); }
.header .nav-chevron { width: 16px; height: 16px; transition: transform 0.3s; fill: #6b7f99; }
.header .nav-dropdown.open .nav-chevron { transform: rotate(180deg); }
.header .dropdown-menu { display: none; background: rgba(13, 27, 42, 0.5); }
.header .nav-dropdown.open .dropdown-menu { display: block; }
.header .dropdown-link { display: block; padding: 10px 40px; font-size: 14px; color: #c0c8d4; transition: color 0.2s, background 0.2s; }
.header .dropdown-link:hover { color: #A8DADC; background: rgba(69, 123, 157, 0.15); }
.header .hamburger { display: flex; flex-direction: column; justify-content: center; gap: 5px; width: 28px; height: 28px; cursor: pointer; }
.header .hamburger-line { display: block; width: 100%; height: 2px; background: #e0e0e0; border-radius: 1px; transition: transform 0.3s, opacity 0.3s; }
.header .hamburger.active .hamburger-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.header .hamburger.active .hamburger-line:nth-child(2) { opacity: 0; }
.header .hamburger.active .hamburger-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
@media (min-width: 1024px) {
  .header .nav { display: flex; position: static; background: transparent; border-top: none; padding: 0; }
  .header .nav-list { flex-direction: row; align-items: center; gap: 0; }
  .header .nav-item { border-bottom: none; }
  .header .nav-link { padding: 8px 16px; font-size: 14px; }
  .header .hamburger { display: none; }
  .header .nav-dropdown { position: relative; }
  .header .dropdown-menu { position: absolute; top: 100%; left: 0; min-width: 200px; background: #1D3557; border: 1px solid rgba(69, 123, 157, 0.3); border-radius: 8px; box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4); padding: 8px 0; }
  .header .dropdown-link { padding: 10px 20px; }
}