:root { --app-header-height: 60px; }
.app-header { height: var(--app-header-height); margin: 0; padding: 0 var(--space-8); display: flex; align-items: center; gap: var(--space-8); border-bottom: 1px solid var(--line); background: var(--surface); }
.app-header .wordmark { color: var(--ink); font-size: 22px; font-weight: 700; letter-spacing: -.8px; text-decoration: none; white-space: nowrap; }
.app-header .app-nav { display: flex; align-self: stretch; gap: 28px; }
.app-header .app-nav a { display: flex; align-items: center; border-bottom: 2px solid transparent; color: var(--muted); font-size: 14px; font-weight: 600; line-height: 22px; white-space: nowrap; text-decoration: none; }
.app-header .app-nav a:hover { color: var(--accent); }
.app-header .app-nav a[aria-current="page"] { border-bottom-color: var(--accent); color: var(--accent); }
.app-header a:focus-visible { outline: 3px solid var(--focus-ring); outline-offset: 3px; }
.app-header .header-action { margin-left: auto; }
@media (max-width: 720px) {
 :root { --app-header-height: 100px; }
 .app-header { padding: 12px 18px 0; display: grid; grid-template-columns: 1fr auto; grid-template-rows: 47px 40px; gap: 0 20px; }
 .app-header .app-nav { grid-column: 1 / -1; grid-row: 2; }
 .app-header .header-action { grid-column: 2; grid-row: 1; font-size: 12px; }
}