/* ---------- Theme (light/dark via prefers-color-scheme) ---------- */
:root {
  --bg: #0b0b0c;
  --surface: #121214;
  --text: #f7f7f8;
  --muted: #b1b1b6;
  --border: #2a2a2e;
  --link: #8ab4ff;
  --accent: #9ae6b4;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --surface: #ffffff;
    --text: #1a1a1e;
    --muted: #6b7280;
    --border: #e5e7eb;
    --link: #1d4ed8;
    --accent: #16a34a;
  }
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(180%) blur(8px);
  background: color-mix(in oklab, var(--bg), transparent 25%);
}
.nav {
  display: flex; align-items: center; justify-content: space-between; gap: .5rem;
  min-height: 56px;
}
.brand {
  display: inline-flex; align-items: center; gap: .5rem; font-weight: 700;
}
.brand img { width: 24px; height: 24px; }
.menu {
  display: flex; align-items: center; gap: .5rem;
  list-style: none; margin: 0; padding: 0;
}
.menu a {
  display: inline-block; padding: .4rem .65rem; border-radius: 8px; border: 1px solid transparent;
}
.menu a[aria-current="page"] {
  border-color: var(--border);
  background: color-mix(in oklab, var(--accent), transparent 86%);
}
.nav-toggle {
  display: none;
}

/* Mobile */
@media (max-width: 640px) {
  .nav { flex-wrap: wrap; }
  .nav-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    border: 1px solid var(--border); border-radius: 8px; padding: .4rem .6rem; background: var(--surface);
  }
  .menu[data-collapsible] { width: 100%; display: none; flex-direction: column; padding: .5rem 0 .75rem; }
  .menu[data-open="true"] { display: flex; }
  .menu a { padding: .6rem .65rem; }
}

/* ---------- Main ---------- */
main { padding: 2rem 0; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  color: var(--muted);
}