/*
 * Shared site navigation bar.
 *
 * Two documents load this file and share no other CSS: the Hugo landing page,
 * and every mdbook page under /docs/. Its tokens are declared on .nav, not on
 * :root, because mdbook declares its own tokens (--bg, --fg) at the same
 * specificity, and a :root token here would win or lose by source order alone.
 */

/*
 * The one token on :root. The mdbook pages read it from outside .nav to
 * offset their fixed sidebar and sticky menu bar. mdbook defines no --nav-*
 * token, so nothing collides.
 */
:root {
  --nav-height: 96px;
}

@media (max-width: 880px) {
  :root {
    --nav-height: 64px;
  }
}

.nav {
  --nav-bg: rgba(255, 255, 255, 0.9);
  --nav-ink: #111111;
  --nav-muted: #444444;
  --nav-line: #ebebeb;
  --nav-accent: #1f4bff;

  /*
   * An explicit height, not vertical padding, so the mdbook pages can offset
   * by a known value (28 + 40 + 28px in the design).
   */
  position: sticky;
  top: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  height: var(--nav-height);
  padding: 0 clamp(20px, 6.67vw, 96px);
  box-sizing: border-box;
  font-family: "Inter", system-ui, sans-serif;
  background-color: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--nav-line);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 800;
  line-height: 28px;
  letter-spacing: -0.03em;
  color: var(--nav-ink);
  text-decoration: none;
}

.nav__logo .logo-mark {
  flex-shrink: 0;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav__link {
  font-size: 15px;
  font-weight: 500;
  line-height: 18px;
  color: var(--nav-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.nav__link:hover {
  color: var(--nav-ink);
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid #e2e2e2;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  line-height: 18px;
  color: var(--nav-ink);
  text-decoration: none;
  transition: border-color 0.15s ease;
}

.nav__cta:hover {
  border-color: var(--nav-ink);
}

/*
 * mdbook's chrome.css sets `a:visited { color: var(--links) }` on every
 * /docs/ page (specificity 0,1,1). That rule beats the rules above after a
 * visit. Restate the colors with the same or higher specificity, so that the
 * nav looks the same on /docs/ as on the Hugo pages.
 */
.nav__logo:visited,
.nav__cta:visited,
.nav__link:visited:hover {
  color: var(--nav-ink);
}

.nav__link:visited {
  color: var(--nav-muted);
}

@media (max-width: 880px) {
  .nav__logo {
    font-size: 19px;
  }

  .nav__menu {
    gap: 20px;
  }

  /* The anchors of the landing page go; Docs and GitHub stay. */
  .nav__link:not(.nav__link--keep) {
    display: none;
  }

  .nav__cta {
    padding: 8px 12px;
  }
}

@media (max-width: 480px) {
  .nav__cta-label {
    display: none;
  }
}