:root { --fg: #1d1f23; --muted: #5d6470; --line: #d9dde3; --bg: #f6f7f9; --card: #fff;
        --accent: #2457d6; --ok: #1d7a3d; --bad: #b3261e; color-scheme: light dark; }
@media (prefers-color-scheme: dark) {
  :root { --fg: #e6e8eb; --muted: #9aa3ae; --line: #343a43; --bg: #15181c; --card: #1d2126; --accent: #7aa2ff;
          --ok: #5fcf86; --bad: #ff8a80; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--fg); background: var(--bg); }
.top { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line); }
.top nav { display: flex; flex-wrap: wrap; gap: 4px 14px; flex: 1; }
.brand { font-weight: 700; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
main { max-width: 1100px; margin: 0 auto; padding: 20px 16px 48px; }
h1 { font-size: 1.5rem; margin: 0 0 16px; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 16px; margin: 0 0 16px; }
.narrow { max-width: 420px; margin: 40px auto; }
label { display: block; margin: 0 0 12px; }
input, select { display: block; width: 100%; margin-top: 4px; padding: 7px 9px; font: inherit; color: inherit;
                background: var(--bg); border: 1px solid var(--line); border-radius: 6px; }
input[type=checkbox] { display: inline; width: auto; margin: 0 6px 0 0; }
button { font: inherit; padding: 7px 14px; border: 1px solid var(--accent); border-radius: 6px; background: var(--accent);
         color: #fff; cursor: pointer; }
button.secondary { background: transparent; color: var(--accent); }
button.danger { border-color: var(--bad); background: transparent; color: var(--bad); }
.inline { display: inline; margin: 0; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.notice { padding: 10px 12px; border-left: 4px solid var(--ok); background: var(--card); }
.error { padding: 10px 12px; border-left: 4px solid var(--bad); background: var(--card); }
.hint, .muted { color: var(--muted); font-size: 0.9em; }
.ok { color: var(--ok); } .bad { color: var(--bad); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table-wrap { overflow-x: auto; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.92em; word-break: break-all; }
.qr svg { width: 200px; height: 200px; background: #fff; padding: 8px; }
fieldset { border: 0; padding: 0; margin: 0 0 12px; }
legend { margin-bottom: 4px; }