.skip-link { position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.skip-link:focus { position: absolute; left: var(--space-6); top: var(--space-6); width: auto; height: auto; padding: var(--space-3) var(--space-4); background: var(--color-surface-3); color: var(--gray-50); border: 1px solid var(--color-primary); border-radius: var(--radius-md); z-index: 9999; box-shadow: var(--shadow-md); }

.site-header { position: sticky; top: 0; z-index: 100; background: linear-gradient(180deg, rgb(14 20 36 / 0.85), rgb(14 20 36 / 0.72)); backdrop-filter: saturate(120%) blur(8px); border-bottom: 1px solid var(--gray-700); box-shadow: var(--shadow-sm); }
.header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-6); min-height: 64px; }

.brand { display: inline-flex; align-items: center; gap: var(--space-3); color: var(--gray-50); font-family: var(--font-serif); font-size: var(--fs-xl); font-weight: 700; letter-spacing: 0.02em; }
.brand:hover { color: var(--gray-50); }
.brand__logo { border-radius: var(--radius-sm); box-shadow: var(--shadow-xs); }
.brand__text { text-shadow: 0 1px 0 rgb(0 0 0 / 0.35); }

.primary-nav { margin-left: auto; }
.nav-list { display: flex; align-items: center; gap: var(--space-6); margin: 0; padding: 0; list-style: none; }
.nav-list a { color: var(--gray-100); font-weight: 600; letter-spacing: 0.01em; padding: var(--space-3) var(--space-2); border-radius: var(--radius-sm); text-decoration: none; }
.nav-list a:hover { color: var(--gray-50); background: rgb(143 60 41 / 0.12); }
.nav-list a:focus-visible { outline: var(--focus-outline); outline-offset: 2px; box-shadow: var(--focus-ring); }

.menu-toggle { display: none; background: none; border: none; padding: 8px; cursor: pointer; }
.menu-toggle__bars { width: 24px; height: 18px; position: relative; display: block; }
.menu-toggle__bars::before,
.menu-toggle__bars::after { content: ''; position: absolute; left: 0; width: 100%; height: 2px; background: var(--gray-100); transition: all 0.25s ease; }
.menu-toggle__bars::before { top: 0; box-shadow: 0 8px 0 var(--gray-100); }
.menu-toggle__bars::after { bottom: 0; }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars::before { top: 8px; transform: rotate(45deg); box-shadow: none; }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars::after { bottom: 8px; transform: rotate(-45deg); }

@media (max-width: 900px) {
  .menu-toggle { display: block; }
  
  .primary-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 75%;
    background: rgba(10, 13, 20, 0.98);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
  }
  
  .primary-nav[aria-hidden="false"] {
    opacity: 1;
    visibility: visible;
  }
  
  .nav-list {
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-8);
  }
  
  .nav-list li {
    width: 100%;
  }
  
  .nav-list a {
    display: block;
    padding: var(--space-5);
    font-size: var(--fs-2xl);
    text-align: center;
    color: var(--gray-50);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
  }
  
  .nav-list a:hover {
    border-color: var(--color-primary);
    background: rgba(143, 60, 41, 0.2);
  }
  
  body.nav-open {
    overflow: hidden;
  }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}