:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1c2430;
  --muted: #5d6878;
  --line: #dde2e8;
  --accent: #1f5fbf;
  --accent-text: #ffffff;
  --danger: #a3261b;
  --danger-bg: #fdecea;
  --tag: #e8eef8;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --surface: #1b2129;
    --text: #e6eaf0;
    --muted: #9aa5b4;
    --line: #2c3540;
    --accent: #6ea2f0;
    --accent-text: #0d1117;
    --danger: #ff8a7f;
    --danger-bg: #3a1d1a;
    --tag: #243246;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: var(--accent); }
main { max-width: 1100px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.35rem; margin: 0 0 12px; }
.top { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--line); }
.top nav { display: flex; flex-wrap: wrap; gap: 4px 14px; flex: 1; }
.brand { font-weight: 700; text-decoration: none; color: var(--text); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 16px; margin-bottom: 16px; }
.narrow { max-width: 420px; margin: 48px auto; }
label { display: block; margin: 0 0 12px; font-weight: 600; }
label.check { font-weight: 400; display: flex; gap: 8px; align-items: center; }
input, select, textarea, button { font: inherit; }
input, select, textarea { display: block; width: 100%; margin-top: 4px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--text); }
label.check input { width: auto; margin: 0; }
textarea { resize: vertical; }
button, .button { display: inline-block; padding: 8px 14px; border: 1px solid var(--accent); border-radius: 6px; background: var(--accent); color: var(--accent-text); cursor: pointer; text-decoration: none; }
button.secondary, .button.secondary { background: transparent; color: var(--accent); }
button.link { background: none; border: none; color: var(--accent); padding: 0; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.inline { display: inline-flex; gap: 8px; align-items: center; margin: 0; }
.inline select { width: auto; margin: 0; }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.row label { flex: 1 1 180px; }
fieldset { border: 1px solid var(--line); border-radius: 6px; margin: 0 0 16px; padding: 12px; }
.bar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; align-items: center; margin-bottom: 8px; }
.scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: var(--surface); margin-bottom: 16px; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .85rem; color: var(--muted); font-weight: 600; }
tr.unread td { font-weight: 700; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 10px; background: var(--tag); font-size: .85rem; font-weight: 600; }
.muted { color: var(--muted); font-weight: 400; }
.small { font-size: .85rem; }
.nowrap { white-space: nowrap; }
.error { background: var(--danger-bg); color: var(--danger); border-radius: 6px; padding: 10px 12px; }
.meta { display: grid; grid-template-columns: max-content 1fr; gap: 2px 12px; margin: 0 0 12px; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; overflow-wrap: anywhere; }
pre.body { white-space: pre-wrap; overflow-wrap: anywhere; font: inherit; background: var(--bg); padding: 12px; border-radius: 6px; max-height: 70vh; overflow: auto; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.status { font-weight: 700; }
.status.sent { color: #2e7d32; }
.status.failed, .status.uncertain { color: var(--danger); }