:root {
  --bg: #f6f7f9; --panel: #fff; --text: #1d2128; --muted: #667085; --border: #e3e6eb;
  --accent: #2557d6; --accent-text: #fff; --ok: #137a3a; --ok-bg: #e5f5ea; --warn: #8a5a00; --warn-bg: #fff4d6;
  --fail: #b42318; --fail-bg: #fde8e6; --info: #475467; --info-bg: #eef0f3; --out-bg: #f3f6ff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418; --panel: #1a1e24; --text: #e6e8eb; --muted: #98a2b3; --border: #2b313a;
    --accent: #6b93ff; --accent-text: #0b0d10; --ok: #5fd08a; --ok-bg: #12301f; --warn: #f5c451; --warn-bg: #33290d;
    --fail: #ff8a80; --fail-bg: #3a1714; --info: #b4bcc8; --info-bg: #232831; --out-bg: #182033;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
header.top { display: flex; align-items: center; gap: 20px; padding: 10px 20px; background: var(--panel); border-bottom: 1px solid var(--border); flex-wrap: wrap; }
header.top .brand { font-weight: 600; }
header.top .brand small { color: var(--muted); font-weight: 400; margin-left: 6px; }
header.top nav { display: flex; gap: 14px; flex: 1; }
header.top nav a.active { font-weight: 600; color: var(--text); }
main { max-width: 1100px; margin: 0 auto; padding: 20px 16px 60px; }
h1 { font-size: 20px; margin: 0 0 14px; }
h2 { font-size: 16px; margin: 26px 0 10px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; }
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; }
.flash.ok { background: var(--ok-bg); color: var(--ok); }
.flash.error { background: var(--fail-bg); color: var(--fail); }
input[type=text], input[type=password], input[type=search], textarea, select {
  font: inherit; color: var(--text); background: var(--panel); border: 1px solid var(--border); border-radius: 6px; padding: 7px 9px;
}
textarea { width: 100%; min-height: 140px; resize: vertical; }
button, .button { font: inherit; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-text); border-radius: 6px; padding: 7px 14px; cursor: pointer; display: inline-block; }
button.secondary, .button.secondary { background: transparent; color: var(--accent); }
button.danger { background: transparent; border-color: var(--fail); color: var(--fail); }
form.inline { display: inline; }
.toolbar { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; align-items: center; }
.toolbar input[type=search] { flex: 1; min-width: 180px; }
table { width: 100%; border-collapse: collapse; }
table.threads td { padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.threads tr:last-child td { border-bottom: 0; }
table.threads tr:hover { background: var(--bg); }
table.threads .who { width: 28%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 0; }
table.threads .subj { max-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
table.threads .when { width: 120px; text-align: right; white-space: nowrap; color: var(--muted); }
.count { color: var(--muted); font-size: 12px; margin-left: 4px; }
.badge { display: inline-block; font-size: 11px; padding: 1px 7px; border-radius: 10px; background: var(--info-bg); color: var(--info); white-space: nowrap; }
.badge.ok, .badge.pass, .badge.sent { background: var(--ok-bg); color: var(--ok); }
.badge.warn, .badge.softfail, .badge.neutral, .badge.sending, .badge.none { background: var(--warn-bg); color: var(--warn); }
.badge.fail, .badge.failed, .badge.permerror, .badge.temperror { background: var(--fail-bg); color: var(--fail); }
.message { margin-bottom: 14px; overflow: hidden; }
.message.out { background: var(--out-bg); }
.message .head { padding: 10px 14px; border-bottom: 1px solid var(--border); display: flex; gap: 10px; flex-wrap: wrap; align-items: baseline; }
.message .head .addrs { flex: 1; min-width: 240px; }
.message .body { padding: 12px 14px; }
.message pre.text { white-space: pre-wrap; word-wrap: break-word; font: inherit; margin: 0; }
.message iframe { width: 100%; height: 460px; border: 1px solid var(--border); border-radius: 6px; background: #fff; resize: vertical; overflow: auto; }
.message details { margin-top: 10px; }
.message .foot { padding: 8px 14px; border-top: 1px solid var(--border); font-size: 12px; display: flex; gap: 14px; flex-wrap: wrap; }
.error-text { color: var(--fail); }
.form-grid { display: grid; grid-template-columns: 110px 1fr; gap: 10px 12px; align-items: center; padding: 16px; }
.form-grid label { color: var(--muted); }
.form-grid .full { grid-column: 1 / -1; }
.from-row { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; }
.checks td { padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.checks tr:last-child td { border-bottom: 0; }
.checks td.lvl { width: 70px; }
.checks td.name { width: 220px; font-weight: 500; }
.checks .fix { margin-top: 4px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; background: var(--bg); padding: 4px 6px; border-radius: 4px; display: inline-block; }
.checks .recs { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; color: var(--muted); word-break: break-all; }
table.plain td, table.plain th { padding: 7px 12px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
table.plain th { font-weight: 500; color: var(--muted); font-size: 12px; }
table.plain tr:last-child td { border-bottom: 0; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }
.login { max-width: 340px; margin: 80px auto; padding: 24px; }
.login input { width: 100%; margin: 10px 0 14px; }
@media (max-width: 640px) {
  table.threads .who { display: none; }
  .form-grid { grid-template-columns: 1fr; }
  .checks td.name { width: auto; }
}