/* Site top bar, skip link and footer. Self-contained (its own --nf-* tokens) so it can be dropped
   into the standalone Downwind map page without touching that page's styles. Keep these values in
   step with the matching tokens at the top of site.css (see docs/design-system.md). */
:root {
  --nf-band: #0f1e33;        /* the navy masthead and footer, same in both schemes' light mode */
  --nf-band-ink: #f6f7f9;
  --nf-band-ink-2: #c9d6ea;
  --nf-band-line: rgba(201, 214, 234, .2);
  --nf-band-link: #a9c1ff;
  --nf-flame: #3d63f0;       /* "Join us" on the band: white text 4.9:1, against the band 3.4:1 */
  --nf-flame-hover: #5576f5;
  --nf-sans: "Libre Franklin", "Franklin Gothic Medium", "Helvetica Neue", Arial, sans-serif;
  --nf-r-ctl: 6px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --nf-band: #14264a;
    --nf-band-line: rgba(201, 214, 234, .16);
  }
}

.topbar, .sitefoot { font-family: var(--nf-sans); color: var(--nf-band-ink); background: var(--nf-band); }
.topbar *, .sitefoot * { box-sizing: border-box; }
.topbar .wrap, .sitefoot .wrap { max-width: 1240px; margin: 0 auto; padding: 0 clamp(18px, 3.2vw, 32px); }
.topbar a:focus-visible, .sitefoot a:focus-visible, .navtoggle:focus-visible + .navtoggle-btn { outline: 3px solid var(--nf-band-link); outline-offset: 2px; }

/* Skip link: hidden until focused, then a solid tab at the top left. */
.skip { position: absolute; left: 12px; top: -80px; z-index: 100; background: var(--nf-flame); color: #fff; font: 700 1rem/1 var(--nf-sans); padding: 14px 18px; border-radius: var(--nf-r-ctl); text-decoration: none; }
.skip:focus { top: 12px; outline: 3px solid #fff; outline-offset: 2px; }

/* ---------- top bar ---------- */
.topbar { position: relative; z-index: 50; border-bottom: 1px solid var(--nf-band-line); }
.topbar-in { display: flex; align-items: center; gap: 20px; min-height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 11px; min-height: 44px; font-family: var(--nf-sans); font-size: 1.2rem; font-weight: 800; letter-spacing: -0.02em; color: var(--nf-band-ink); text-decoration: none; white-space: nowrap; }
.brand-mark { width: 30px; height: 30px; border-radius: 6px; background: url("/assets/favicon.svg") center/cover; box-shadow: 0 0 0 1px var(--nf-band-line); flex: none; }
.topbar nav { margin-left: auto; }
.topbar nav ul { display: flex; gap: 2px; list-style: none; margin: 0; padding: 0; align-items: center; }
.topbar nav a { display: flex; align-items: center; min-height: 44px; padding: 0 12px; color: var(--nf-band-ink-2); text-decoration: none; font-size: 0.95rem; font-weight: 500; position: relative; border-radius: var(--nf-r-ctl); }
.topbar nav a:hover { color: var(--nf-band-ink); }
.topbar nav a[aria-current="page"] { color: var(--nf-band-ink); font-weight: 600; }
.topbar nav a[aria-current="page"]:not(.nav-cta)::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 3px; height: 3px; border-radius: 2px; background: var(--nf-band-ink); }
.topbar nav a.nav-cta { font-weight: 700; padding: 0 18px; margin-left: 8px; background: var(--nf-flame); color: #fff; }
.topbar nav a.nav-cta:hover { background: var(--nf-flame-hover); }
.topbar nav a.nav-cta.ghost { background: transparent; color: var(--nf-band-ink); box-shadow: inset 0 0 0 2px var(--nf-band-ink-2); margin-left: 14px; }
.topbar nav a.nav-cta.ghost:hover { box-shadow: inset 0 0 0 2px var(--nf-band-ink); background: rgba(255, 255, 255, .06); }
.topbar nav a.nav-cta[aria-current="page"] { box-shadow: inset 0 0 0 2px var(--nf-band-ink), 0 0 0 2px var(--nf-band); }

/* Mobile menu: a pure-CSS checkbox toggle. */
.navtoggle { position: absolute; opacity: 0; width: 1px; height: 1px; }
.navtoggle-btn { display: none; }
@media (min-width: 1061px) { .navtoggle { display: none; } } /* no invisible tab stop on desktop */
@media (max-width: 1060px) {
  .navtoggle-btn { display: flex; margin-left: auto; width: 48px; height: 48px; margin-right: -8px; align-items: center; justify-content: center; cursor: pointer; border-radius: var(--nf-r-ctl); }
  .navtoggle-btn:hover { background: rgba(255, 255, 255, .08); }
  .navtoggle-btn span, .navtoggle-btn span::before, .navtoggle-btn span::after { display: block; width: 22px; height: 2.5px; border-radius: 2px; background: var(--nf-band-ink); position: relative; content: ""; transition: transform .2s ease, background-color .2s ease; }
  .navtoggle-btn span::before { position: absolute; top: -7px; }
  .navtoggle-btn span::after { position: absolute; top: 7px; }
  .navtoggle:checked + .navtoggle-btn span { background: transparent; }
  .navtoggle:checked + .navtoggle-btn span::before { transform: translateY(7px) rotate(45deg); }
  .navtoggle:checked + .navtoggle-btn span::after { transform: translateY(-7px) rotate(-45deg); }
  .topbar nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: var(--nf-band); border-bottom: 1px solid var(--nf-band-line); box-shadow: 0 18px 30px rgba(6, 12, 22, .35); padding: 6px clamp(18px, 3.2vw, 32px) 22px; }
  .navtoggle:checked ~ nav { display: block; }
  .topbar nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .topbar nav li { border-bottom: 1px solid var(--nf-band-line); }
  .topbar nav li:has(.nav-cta) { border-bottom: 0; }
  .topbar nav a { min-height: 52px; padding: 0 2px; font-size: 1.08rem; border-radius: 0; }
  .topbar nav a[aria-current="page"]:not(.nav-cta)::after { left: -14px; right: auto; top: 14px; bottom: 14px; width: 4px; height: auto; }
  .topbar nav a.nav-cta, .topbar nav a.nav-cta.ghost { margin: 12px 0 0; justify-content: center; border-radius: var(--nf-r-ctl); }
}
@media (prefers-reduced-motion: reduce) {
  .navtoggle-btn span, .navtoggle-btn span::before, .navtoggle-btn span::after { transition: none; }
}

/* ---------- footer ---------- */
.sitefoot { margin-top: 96px; padding: 56px 0 28px; font-size: 0.95rem; line-height: 1.6; color: var(--nf-band-ink-2); position: relative; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1.3fr; gap: 40px; }
@media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr; gap: 28px; } }
.sitefoot p { margin: 0 0 10px; max-width: 36em; }
.sitefoot ul { list-style: none; margin: 0; padding: 0; }
.sitefoot li a { display: inline-flex; align-items: center; min-height: 34px; }
@media (pointer: coarse), (max-width: 760px) { .sitefoot li a { min-height: 44px; } }
.sitefoot a { color: var(--nf-band-ink); text-decoration-color: var(--nf-band-line); text-underline-offset: 3px; }
.sitefoot a:hover { text-decoration-color: currentColor; }
.foot-brand { font-size: 1.35rem; font-weight: 800; letter-spacing: -0.02em; color: var(--nf-band-ink); }
.foot-tag { margin-top: -0.35em; font-weight: 600; color: var(--nf-band-ink); }
.foot-h { font-size: 0.95rem; font-weight: 700; color: var(--nf-band-ink); padding-bottom: 8px; border-bottom: 2px solid var(--nf-band-ink); display: inline-block; }
.foot-small { font-size: 0.9rem; }
.sitefoot .foot-base { margin: 40px auto 0; padding-top: 18px; border-top: 1px solid var(--nf-band-line); font-size: 0.85rem; color: var(--nf-band-ink-2); }

@media print {
  .topbar, .sitefoot, .skip { display: none !important; }
}