/* The HUB theme: root page, group indexes, tag/search/sign-in/404 pages. Quiet launcher, neutral palette. */
:root {
  --bg: #f7f7f5; --bg-alt: #ffffff; --text: #1d1f23; --text-muted: #5b6270; --accent: #2f5f8f; --accent-contrast: #ffffff;
  --border: #d9dbe0; --card-bg: #ffffff; --link: #1f4f80;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-head: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 8px; --max-width: 70rem;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161a; --bg-alt: #1b1e24; --text: #e7e9ee; --text-muted: #9aa1ae; --accent: #6fa8dc; --accent-contrast: #0e1115;
    --border: #2b3038; --card-bg: #1b1e24; --link: #8fbbe8;
  }
}
:root[data-theme="dark"] {
  --bg: #14161a; --bg-alt: #1b1e24; --text: #e7e9ee; --text-muted: #9aa1ae; --accent: #6fa8dc; --accent-contrast: #0e1115;
  --border: #2b3038; --card-bg: #1b1e24; --link: #8fbbe8;
}
.card { transition: border-color .15s, transform .15s; }
.card:hover, .card:focus-visible { border-color: var(--accent); transform: translateY(-2px); }
.card:focus-visible, .chip:focus-visible, .button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { .card { transition: none; } .card:hover { transform: none; } }