.site-header{position:relative;z-index:800;border-bottom:1px solid var(--color-line);background:rgba(255,253,247,.96)}@supports (backdrop-filter:blur(8px)){.site-header{background:rgba(255,253,247,.88);backdrop-filter:blur(8px)}}.site-header__inner{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);min-height:4.5rem}.site-header__brand{display:flex;flex:0 1 auto;align-items:center;gap:var(--space-2);min-width:0;color:var(--color-ink);text-decoration:none}.site-header__brand:hover,.site-header__brand:focus-visible{color:var(--color-ink);text-decoration:none}.site-header__logo{flex:0 0 2.125rem;width:2.125rem;height:2.125rem;object-fit:contain}.site-header__brand-copy{display:grid;min-width:0;gap:0}.site-header__brand-name{overflow:hidden;font-family:var(--font-heading);font-size:1.125rem;font-weight:var(--weight-bold);letter-spacing:-.035em;line-height:1.05;text-overflow:ellipsis;white-space:nowrap}.site-header__brand-note{display:none;color:var(--color-text-muted);font-size:.6875rem;font-weight:var(--weight-medium);letter-spacing:.03em;line-height:1.25}.site-header__toggle{display:inline-grid;flex:0 0 2.75rem;place-items:center;width:2.75rem;height:2.75rem;padding:0;border:1px solid var(--color-line);border-radius:var(--radius-md);background:var(--color-white);color:var(--color-ink);box-shadow:var(--shadow-control)}.site-header__toggle-lines,.site-header__toggle-lines::before,.site-header__toggle-lines::after{display:block;width:1.25rem;height:2px;border-radius:2px;background:currentColor;transition:transform var(--transition-fast),opacity var(--transition-fast)}.site-header__toggle-lines{position:relative}.site-header__toggle-lines::before,.site-header__toggle-lines::after{position:absolute;left:0;content:""}.site-header__toggle-lines::before{top:-.4rem}.site-header__toggle-lines::after{top:.4rem}.site-header__toggle[aria-expanded="true"] .site-header__toggle-lines{background:transparent}.site-header__toggle[aria-expanded="true"] .site-header__toggle-lines::before{top:0;transform:rotate(45deg)}.site-header__toggle[aria-expanded="true"] .site-header__toggle-lines::after{top:0;transform:rotate(-45deg)}.site-header__nav{position:absolute;top:calc(100% + 1px);right:0;left:0;display:none;max-height:calc(100vh - 4.5rem);overflow-y:auto;border-bottom:1px solid var(--color-line);background:var(--color-paper);box-shadow:var(--shadow-card)}.site-header__nav.is-open{display:block}.site-header__list{display:grid;gap:0;margin:0;padding:var(--space-2) var(--gutter) var(--space-4);list-style:none}.site-header__list li,.site-header__list li+li{margin:0;padding:0}.site-header__list a{display:flex;align-items:center;min-height:2.75rem;padding-inline:var(--space-2);border-radius:var(--radius-sm);color:var(--color-ink);font-family:var(--font-heading);font-size:var(--text-sm);font-weight:var(--weight-semibold);line-height:1.25;text-decoration:none}.site-header__list a:hover,.site-header__list a:focus-visible{background:var(--color-mint);color:var(--color-ink);text-decoration:underline}.site-header__action{display:none}@media (min-width:68rem){.site-header__inner{min-height:4.75rem;gap:var(--space-4)}.site-header__logo{flex-basis:2.5rem;width:2.5rem;height:2.5rem}.site-header__brand{gap:var(--space-3)}.site-header__brand-name{font-size:1.375rem}.site-header__brand-note{display:block}.site-header__toggle{display:none}.site-header__nav{position:static;display:block;max-height:none;overflow:visible;border:0;background:transparent;box-shadow:none}.site-header__list{display:flex;align-items:center;justify-content:center;gap:var(--space-1);padding:0}.site-header__list a{min-height:2.5rem;padding-inline:.625rem;white-space:nowrap}.site-header__action{display:inline-flex;flex:0 0 auto;min-height:2.5rem;padding-inline:.875rem;font-size:.8125rem;white-space:nowrap}}