.site-header { position: fixed; z-index: 100; top: 16px; left: 0; width: 100%; pointer-events: none; }
.site-header__shell { display: flex; width: min(calc(100% - 32px), var(--nav-max)); min-height: 56px; margin-inline: auto; align-items: center; gap: 16px; padding: 8px 12px; border: var(--border-default); border-radius: var(--radius-nav); background: var(--color-surface-900); box-shadow: var(--shadow-floating), var(--shadow-panel-inset); pointer-events: auto; }
.site-header__spacer { height: 88px; }
.site-header__brand, .site-header__mobile-brand { display: inline-flex; min-width: 0; align-items: center; gap: 9px; color: var(--color-text-primary); font-family: var(--font-mono); font-size: 11px; font-weight: 500; letter-spacing: .12em; line-height: 1; text-decoration: none; text-transform: uppercase; white-space: nowrap; }
.site-header__logo { width: 28px; height: 28px; flex: 0 0 28px; object-fit: contain; }
.site-header__navigation { display: flex; min-width: 0; flex: 1; align-items: center; justify-content: flex-end; gap: 14px; }
.site-header__links { display: flex; min-width: 0; align-items: center; gap: 18px; margin: 0; padding: 0; list-style: none; }
.site-header__links li, .site-header__links li + li { margin: 0; padding: 0; }
.site-header__links a { position: relative; display: inline-flex; align-items: center; min-height: 36px; color: var(--color-text-secondary); font-family: var(--font-heading); font-size: 13px; font-weight: 500; line-height: 1; text-decoration: none; white-space: nowrap; }
.site-header__links a::after { position: absolute; right: 0; bottom: 4px; left: 0; height: 1px; transform: scaleX(0); transform-origin: left; background: var(--color-signal-green); content: ""; transition: transform var(--transition-control); }
.site-header__links a:hover::after, .site-header__links a:focus-visible::after { transform: scaleX(1); }
.site-header__cta { min-height: 38px; flex: 0 0 auto; padding: 10px 15px; font-size: 13px; white-space: nowrap; }
.site-header__toggle, .site-header__mobile-brand, .site-header__route, .site-header__mobile-utility { display: none; }
@media (max-width: 860px) { .site-header { top: 12px; } .site-header__shell { position: relative; min-height: 52px; justify-content: space-between; padding: 7px 10px 7px 12px; border-radius: 14px; } .site-header__spacer { height: 76px; } .site-header__logo { width: 26px; height: 26px; flex-basis: 26px; } .site-header__brand { font-size: 10px; } .site-header__toggle { display: inline-flex; width: 40px; height: 36px; flex: 0 0 40px; flex-direction: column; align-items: center; justify-content: center; gap: 4px; padding: 0; border: 1px solid var(--color-line-subtle); border-radius: 8px; background: var(--color-surface-850); } .site-header__toggle-line { display: block; width: 17px; height: 1px; background: var(--color-text-primary); transition: transform var(--transition-control), opacity var(--transition-control); } .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) { transform: translateY(5px) rotate(45deg); } .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) { opacity: 0; } .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) { transform: translateY(-5px) rotate(-45deg); } .site-header__navigation { position: absolute; top: calc(100% + 8px); right: 0; left: 0; display: flex; max-height: min(70vh, 560px); overflow-y: auto; flex-direction: column; align-items: stretch; gap: 18px; padding: 20px; transform: translateY(-8px); border: var(--border-default); border-radius: 10px; background: var(--color-surface-900); box-shadow: var(--shadow-floating); opacity: 0; pointer-events: none; transition: opacity 180ms ease-out, transform 180ms ease-out; } .site-header__navigation.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; } .site-header__mobile-brand { display: inline-flex; font-size: 12px; } .site-header__mobile-brand img { width: 32px; height: 32px; object-fit: contain; } .site-header__route { display: block; margin: 0; color: var(--color-text-muted); font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; } .site-header__links { width: 100%; flex-direction: column; align-items: stretch; gap: 0; border-block: var(--border-default); } .site-header__links a { min-height: 52px; justify-content: space-between; font-size: 18px; } .site-header__links a::after { width: 20px; right: auto; bottom: 8px; } .site-header__cta { width: 100%; min-height: 48px; } .site-header__mobile-utility { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 16px; } .site-header__mobile-utility a { color: var(--color-text-secondary); font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em; text-decoration: none; text-transform: uppercase; } }
@media (prefers-reduced-motion: reduce) { .site-header__navigation, .site-header__toggle-line { transition: none; } }