/* GNSS Getting Started — shared sidebar layout
   Relies on each page's CSS custom properties (--surface, --border, etc.) */

body { display: flex; align-items: flex-start; }
main { flex: 1 1 auto; min-width: 0; }

/* ---------- sidebar (desktop) ---------- */
.sidenav {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  width: 236px;
  flex: none;
  box-sizing: border-box;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 18px 12px 20px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sidenav .brand {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .02em;
  margin: 0 6px 6px;
  line-height: 1.3;
}
.sidenav .brand a { color: var(--text); text-decoration: none; }
.sidenav .brand a:hover { color: var(--accent); }
.sidenav .grp {
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--muted);
  margin: 14px 6px 4px;
}
.sidenav a.mi {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 8px;
  border-radius: 8px;
  color: var(--muted);
  text-decoration: none;
  font-size: .86rem;
  line-height: 1.35;
}
.sidenav a.mi:hover { color: var(--accent); background: var(--surface2); }
.sidenav a.mi.active { color: var(--accent); background: var(--surface2); font-weight: 600; }
.sidenav a.mi:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sidenav .no {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: .68rem;
  width: 1.7em;
  flex: none;
  text-align: right;
  opacity: .75;
}
.sidenav a.mi.home .no { visibility: hidden; }
.sidenav a.lang {
  margin: 16px 6px 0;
  align-self: flex-start;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 14px;
  color: var(--muted);
  text-decoration: none;
  font-size: .82rem;
  font-weight: 600;
}
.sidenav a.lang:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- mobile top bar + drawer ---------- */
.topbar { display: none; }
.scrim { display: none; }

@media (max-width: 900px) {
  body { display: block; }
  .topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 10px 14px;
    font-weight: 700;
    font-size: .95rem;
  }
  .topbar button {
    appearance: none;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    border-radius: 8px;
    font-size: 1.1rem;
    line-height: 1;
    padding: 6px 11px;
    cursor: pointer;
  }
  .topbar button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
  .sidenav {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    height: auto;
    z-index: 30;
    transform: translateX(-105%);
    transition: transform .22s ease;
    box-shadow: 4px 0 24px rgba(0, 0, 0, .25);
  }
  body.nav-open .sidenav { transform: none; }
  body.nav-open .scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 25;
    background: rgba(0, 0, 0, .45);
  }
  @media (prefers-reduced-motion: reduce) {
    .sidenav { transition: none; }
  }
}