:root { --fg: #14213d; --muted: #5b6f8a; --bg: #f5f7fb; --card: #fff; --line: #d5e0ef; --accent: #1b6be2; --danger: #c0392b; --ok: #1e8449; }
* { 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); }
.nav { display: flex; gap: 18px; align-items: center; padding: 12px 24px; background: var(--card); border-bottom: 1px solid var(--line); }
.nav a { color: var(--fg); text-decoration: none; }
.nav .brand { font-weight: 700; color: var(--accent); }
.nav .spacer { flex: 1; }
.muted { color: var(--muted); }
.main { max-width: 900px; margin: 32px auto; padding: 0 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin-bottom: 20px; }
.card.narrow { max-width: 420px; margin: 40px auto; }
h1 { font-size: 24px; margin: 0 0 16px; }
h2 { font-size: 18px; margin: 24px 0 8px; }
label { display: block; font-weight: 600; margin-bottom: 4px; }
input[type=text], input[type=email], select { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; font: inherit; }
button, .btn { padding: 9px 14px; border: 0; border-radius: 8px; background: var(--accent); color: #fff; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; display: inline-block; }
button.secondary, .btn.secondary { background: #e9eef7; color: var(--fg); }
button.block, .btn.block { display: block; width: 100%; text-align: center; }
button.danger { background: var(--danger); }
button.link { background: none; color: var(--accent); padding: 0; font-weight: 500; }
button.small { padding: 4px 10px; font-size: 13px; }
.inline { display: inline; }
.row { display: flex; gap: 12px; align-items: end; }
.row > * { flex: 1; }
.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; }
.flash-ok { background: #e8f6ee; color: var(--ok); }
.flash-error { background: #fdecea; color: var(--danger); }
.error { color: var(--danger); font-size: 14px; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; word-break: break-all; }
.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; background: #e9eef7; }
.badge.ok { background: #e8f6ee; color: var(--ok); }
.badge.bad { background: #fdecea; color: var(--danger); }
.dns td:last-child { white-space: nowrap; }
.google { margin-top: 12px; }
details.card > summary { cursor: pointer; font-size: 18px; font-weight: 600; }
details.card[open] > summary { margin-bottom: 8px; }
details.card > summary .badge { margin-left: 8px; font-weight: 500; }