:root {
  --hx-navy: #0d2740;
  --hx-blue: #1f5686;
  --bg: #fff;
  --fg: #191e1e;
  --link: #1565c0;
  --panel: #f3f5f7;
  --border: #d5dbe0;
  --muted: #566069;
  --heading: #1f5686;
  --logo-filter: drop-shadow(0 0 1px rgba(13, 39, 64, 0.6));
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1b1f23;
    --fg: #e6e9ec;
    --link: #6cb2f0;
    --heading: #6cb2f0;
    --panel: #242a30;
    --border: #38414a;
    --muted: #9aa5af;
    --logo-filter: none;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
    --bg: #1b1f23;
    --fg: #e6e9ec;
    --link: #6cb2f0;
    --heading: #6cb2f0;
    --panel: #242a30;
    --border: #38414a;
    --muted: #9aa5af;
    --logo-filter: none;
    color-scheme: dark;
}

:root[data-theme="light"] { color-scheme: light; }

* { box-sizing: border-box; }

html { scroll-padding-top: 4rem; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 1rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  overflow-wrap: break-word;
}

a { color: var(--link); }

img { max-width: 100%; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0 1.5rem;
  min-height: 3.5rem;
  padding: 0 1rem;
  background: var(--hx-navy);
}

.site-header a { color: #fff; text-decoration: none; }
.site-header nav a:hover { text-decoration: underline; }

.theme-toggle {
  padding: 0.25rem 0.6rem;
  border: 1px solid #c3d2e0;
  border-radius: 0.3rem;
  background: transparent;
  color: #fff;
  font: inherit;
  cursor: pointer;
}
.theme-toggle[aria-pressed="true"] { background: rgba(255, 255, 255, 0.18); }
.theme-toggle:hover { background: rgba(255, 255, 255, 0.12); }
.theme-toggle[hidden] { display: none; }
:focus-visible { outline: 3px solid #f2b705; outline-offset: 2px; }

.brand { display: flex; align-items: center; gap: 0.6rem; height: 3.5rem; font-weight: 700; font-size: 1.15rem; }
.brand img { height: 1.75rem; width: auto; }

.site-header nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; }

main > section { max-width: 72rem; margin: 0 auto; padding: 3rem 1rem 1rem; }

main > #hero {
  max-width: none;
  padding: 4rem 1rem;
  background: var(--hx-navy);
  color: #fff;
  text-align: center;
}

#hero h1 { margin: 0 0 0.5rem; font-size: clamp(1.9rem, 6vw, 3rem); line-height: 1.2; }
#hero .lead { margin: 0 auto 1rem; max-width: 40rem; font-size: 1.25rem; }
#hero .mission { margin: 0 auto 2rem; max-width: 40rem; color: #c3d2e0; }

.button {
  display: inline-block;
  margin: 0.25rem;
  padding: 0.65rem 1.4rem;
  border: 2px solid var(--hx-blue);
  border-radius: 0.3rem;
  background: var(--hx-blue);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
}
.button:hover { background: #2a6aa3; border-color: #2a6aa3; }
.button.secondary { background: transparent; border-color: #fff; }
.button.secondary:hover { background: rgba(255, 255, 255, 0.12); }

h2 { margin: 0 0 1.25rem; color: var(--heading); font-size: 1.75rem; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1.25rem; }

.card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--panel);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 6px 16px rgba(0, 0, 0, 0.18); }
.card h3 { margin: 0.5rem 0; }
.card p { margin: 0.4rem 0; }
.card-logo { display: block; height: 3rem; width: auto; filter: var(--logo-filter); }

.badge.version {
  display: inline-block;
  padding: 0.05rem 0.5rem;
  border-radius: 1rem;
  background: var(--hx-blue);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  vertical-align: middle;
}

.meta { color: var(--muted); font-size: 0.9rem; }

.detail { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.detail h3 { margin: 0 0 0.5rem; }
.versions a { margin-right: 0.6rem; }

.quickstart { margin-bottom: 2rem; }
.quickstart h3 { margin-bottom: 0.5rem; }

.tabbar { display: flex; flex-wrap: wrap; gap: 0.25rem; margin-bottom: 0.5rem; }
.tabbar button {
  padding: 0.35rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 0.3rem;
  background: var(--panel);
  color: var(--fg);
  font: inherit;
  cursor: pointer;
}
.tabbar button:hover { border-color: var(--hx-blue); }
.tabbar button[aria-pressed="true"] { background: var(--hx-blue); border-color: var(--hx-blue); color: #fff; }

.snippet { margin: 0 0 1rem; }
.snippet figcaption { margin-bottom: 0.25rem; color: var(--muted); font-size: 0.85rem; }
.snippet[hidden] { display: none; }
.snippet pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: var(--panel);
  font: 0.875rem/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.feed { margin: 0; padding: 0; list-style: none; }
.feed li { padding: 0.9rem 0; border-bottom: 1px solid var(--border); }
.feed time { margin-left: 0.5rem; color: var(--muted); font-size: 0.9rem; }
.feed p { margin: 0.25rem 0; }

.links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; margin: 0; padding: 0; list-style: none; }

.site-footer {
  margin-top: 4rem;
  padding: 2rem 1rem;
  background: var(--hx-navy);
  color: #c3d2e0;
  text-align: center;
}
.site-footer p { margin: 0; }

@media (max-width: 640px) {
  .site-header { position: static; padding-bottom: 0.5rem; }
  .brand { height: 3rem; }
  main > section { padding-top: 2rem; }
  main > #hero { padding: 2.5rem 1rem; }
}

.site-footer .links { justify-content: center; margin-top: 0.75rem; }
.site-footer a { color: #fff; }