.site-header { min-height: 72px; display: flex; align-items: center; background: var(--surface); border-bottom: 1px solid var(--border); }
.site-header__inner { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; display: flex; align-items: center; gap: 16px; min-height: 72px; }
.brand-lockup { color: var(--fg); display: inline-flex; align-items: center; gap: 10px; flex: none; text-decoration: none; }
.brand-lockup img { width: 28px; height: 28px; }
.brand-lockup span { font-family: var(--font-display); font-size: 28px; letter-spacing: -.04em; line-height: 1; }
.site-nav { display: flex; align-items: center; gap: 24px; margin-left: auto; }
.site-nav a { color: var(--fg); font-size: 14px; font-weight: 500; text-decoration: none; }
.site-nav a[aria-current="page"], .site-nav a:hover { color: var(--accent-ink); text-decoration: underline; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.theme-toggle, .menu-toggle { display: grid; width: 44px; height: 44px; place-items: center; padding: 0; border: 1px solid var(--border-control); border-radius: 50%; background: transparent; }
.theme-toggle svg, .menu-toggle svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.theme-toggle .moon, [data-theme="dark"] .theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .moon { display: block; }
.button { min-height: 52px; display: inline-flex; align-items: center; justify-content: center; padding: 12px 20px; border: 1px solid transparent; border-radius: var(--radius-control); font-size: 14px; font-weight: 500; line-height: 20px; text-align: center; text-decoration: none; transition: background-color 170ms ease, border-color 170ms ease, color 170ms ease; }
.button--primary { color: var(--on-accent); background: var(--accent); }
.button--primary:hover { background: var(--accent-hover); color: var(--on-accent); text-decoration: none; }
.button--secondary { color: var(--fg); background: transparent; border-color: var(--border-control); }
.button--secondary:hover { background: var(--surface-2); text-decoration: none; }
.button--compact { min-height: 44px; padding-inline: 16px; }
.mobile-menu { border-top: 1px solid var(--border); background: var(--surface); }
.mobile-menu[hidden] { display: none; }
.mobile-menu__inner { display: grid; padding: 12px 20px 20px; }
.mobile-menu a { min-height: 44px; display: flex; align-items: center; color: var(--fg); font-weight: 500; }
.site-footer { padding: 48px 0 24px; border-top: 1px solid var(--border); background: var(--surface); }
.site-footer__grid { display: grid; gap: 32px; }
.site-footer p { max-width: 32ch; margin-top: 12px; color: var(--caption); font-size: 13px; line-height: 20px; }
.footer-links h2 { font-family: var(--font-sans); font-size: 13px; line-height: 20px; letter-spacing: normal; }
.footer-links ul { display: grid; gap: 8px; padding: 0; margin: 12px 0 0; list-style: none; }
.footer-links a { font-size: 14px; }
.footer-bottom { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--caption); font-size: 13px; line-height: 20px; }
@media (min-width: 768px) { .site-header { min-height: 80px; } .site-header__inner { width: min(var(--container), calc(100% - 64px)); min-height: 80px; } .site-footer__grid { grid-template-columns: minmax(0, 2fr) 1fr 1fr; } }
@media (min-width: 900px) { .menu-toggle, .mobile-menu { display: none !important; } }
@media (max-width: 899px) { .site-nav { display: none; } .header-actions { margin-left: auto; } }
@media (max-width: 390px) { .site-header__inner { width: calc(100% - 32px); gap: 6px; } .brand-lockup { gap: 6px; } .brand-lockup img { width: 24px; height: 24px; } .brand-lockup span { font-size: 24px; } .button--compact { padding-inline: 10px; } .header-actions { gap: 4px; } }
/* 320px: the compact CTA wrapped to two lines (66px tall, past its 44px hit-compact); keep it one line. */
@media (max-width: 359px) { .brand-lockup { gap: 4px; } .brand-lockup img { width: 20px; height: 20px; } .brand-lockup span { font-size: 20px; } .header-actions .button--compact { white-space: nowrap; padding-inline: 8px; } }