.site-header { position: sticky; top: 0; z-index: 100; background: color-mix(in srgb, var(--color-bg) 92%, transparent); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--color-divider); transition: box-shadow var(--transition-slow); }
.site-header--scrolled { box-shadow: var(--shadow-md); border-bottom-color: var(--color-border); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: var(--space-4); }
.nav__logo { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; flex-shrink: 0; }
.nav__logo-mark { width: 36px; height: 36px; flex-shrink: 0; }
.nav__logo-text { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 800; color: var(--color-text); line-height: 1; letter-spacing: -0.02em; }
.nav__logo-sub { font-size: var(--text-xs); font-weight: 500; color: var(--color-text-muted); letter-spacing: 0.02em; display: block; margin-top: 2px; }
.nav__links { display: flex; align-items: center; gap: var(--space-1); list-style: none; }
.nav__links a { font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted); padding: var(--space-2) var(--space-3); border-radius: var(--radius-md); text-decoration: none; transition: all var(--transition-fast); }
.nav__links a:hover, .nav__links a[aria-current="page"] { color: var(--color-text); background: var(--color-surface-offset); }
.nav__links a[aria-current="page"] { color: var(--color-primary); font-weight: 600; }
.nav__actions { display: flex; align-items: center; gap: var(--space-2); }
.theme-toggle { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: var(--radius-md); color: var(--color-text-muted); border: 1px solid var(--color-border); background: var(--color-surface); cursor: pointer; transition: all var(--transition-fast); }
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-offset); }
.nav__hamburger { display: none; flex-direction: column; gap: 5px; width: 36px; height: 36px; align-items: center; justify-content: center; border-radius: var(--radius-md); color: var(--color-text); cursor: pointer; border: 1px solid var(--color-border); background: var(--color-surface); }
.nav__hamburger span { display: block; width: 18px; height: 2px; background: currentColor; border-radius: 2px; transition: all var(--transition-fast); }
.nav__mobile { display: none; flex-direction: column; gap: var(--space-1); padding: var(--space-4); border-top: 1px solid var(--color-divider); background: var(--color-surface); }
.nav__mobile.is-open { display: flex; }
.nav__mobile a { font-size: var(--text-base); font-weight: 500; color: var(--color-text-muted); padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); text-decoration: none; }
.nav__mobile a:hover, .nav__mobile a[aria-current="page"] { color: var(--color-text); background: var(--color-surface-offset); }
.nav__mobile a[aria-current="page"] { color: var(--color-primary); font-weight: 600; }
.nav__mobile .btn { justify-content: center; width: 100%; margin-top: var(--space-2); }
@media (max-width: 768px) { .nav__links { display: none; } .nav__hamburger { display: flex; } .nav__cta-desktop { display: none; } }
.site-footer { background: var(--color-navy); color: rgba(255,255,255,0.8); padding-block: clamp(var(--space-12), 6vw, var(--space-20)); }
[data-theme="dark"] .site-footer { background: var(--color-surface); border-top: 1px solid var(--color-border); color: var(--color-text-muted); }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-8); }
.footer__logo { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; margin-bottom: var(--space-4); }
.footer__logo-text { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 800; color: #ffffff; letter-spacing: -0.02em; }
[data-theme="dark"] .footer__logo-text { color: var(--color-text); }
.footer__tagline { font-size: var(--text-sm); color: rgba(255,255,255,0.6); line-height: 1.6; margin-bottom: var(--space-6); max-width: 28ch; }
.footer__disclaimer { font-size: var(--text-xs); color: rgba(255,255,255,0.4); line-height: 1.6; max-width: 36ch; }
.footer__col-title { font-family: var(--font-display); font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: rgba(255,255,255,0.4); margin-bottom: var(--space-4); }
.footer__links { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.footer__links a { font-size: var(--text-sm); color: rgba(255,255,255,0.7); text-decoration: none; transition: color var(--transition-fast); }
.footer__links a:hover { color: var(--color-primary); }
.footer__bottom { margin-top: clamp(var(--space-8), 4vw, var(--space-12)); padding-top: var(--space-6); border-top: 1px solid rgba(255,255,255,0.1); display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; }
.footer__copyright { font-size: var(--text-xs); color: rgba(255,255,255,0.4); }
.footer__attribution a { font-size: var(--text-xs); color: rgba(255,255,255,0.4); text-decoration: none; }
.footer__attribution a:hover { color: var(--color-primary); }
@media (max-width: 768px) { .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--space-8); } .footer__brand { grid-column: 1 / -1; } }
@media (max-width: 480px) { .footer__grid { grid-template-columns: 1fr; } .footer__bottom { flex-direction: column; text-align: center; } }