:root {
  --bg: #f6f6f4;
  --card: #ffffff;
  --text: #1d1d1b;
  --muted: #6b6b66;
  --line: #e4e3df;
  --accent: #f28c0f;
  --accent-text: #ffffff;
  --ok: #2e8b57;
  --warn: #c7850a;
  --bad: #c0392b;
  --idle: #9a9a94;
  --bubble: #eef3fb;
  --radius: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151514;
    --card: #1f1f1d;
    --text: #ecebe7;
    --muted: #a09f99;
    --line: #34332f;
    --accent: #f59a2a;
    --accent-text: #1a1a1a;
    --bubble: #26303d;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
/* Author display rules (flex, grid) must not revive hidden elements. */
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 12px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 2;
}
.brand { font-weight: 700; }
nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
nav a {
  padding: 6px 12px;
  border-radius: 8px;
  color: var(--muted);
  text-decoration: none;
}
nav a.active { background: var(--bg); color: var(--text); font-weight: 600; }

@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; gap: 8px 12px; padding: 10px 16px; }
  .brand { flex: 1; }
  nav { order: 3; flex-basis: 100%; }
  nav a { padding: 6px 10px; }
}

h3.sub { font-size: 14px; margin: 16px 0 0; color: var(--muted); font-weight: 600; }

main { max-width: 1180px; margin: 0 auto; padding: 24px 16px 64px; }

h1 { font-size: 22px; margin: 0; }
h2 { font-size: 17px; margin: 24px 0 8px; }
.card h2:first-child { margin-top: 0; }

.head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.card .head { margin-bottom: 8px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}
.narrow { max-width: 420px; margin: 64px auto; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 12px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.stat .v { font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .k { color: var(--muted); font-size: 13px; }

.split { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 16px; align-items: start; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }

label { display: block; margin-bottom: 12px; font-weight: 600; font-size: 14px; }
label.inline { display: flex; align-items: center; gap: 8px; font-weight: 400; }
input, select, textarea {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
textarea { resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 14px; }
input[type=checkbox] { width: auto; margin: 0; }
fieldset { border: 1px solid var(--line); border-radius: 8px; margin: 0 0 12px; padding: 8px 12px 12px; }
legend { font-weight: 600; font-size: 14px; padding: 0 4px; }

.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.row > label { flex: 1 1 160px; }
.row > label.inline { flex: 0 0 auto; margin-bottom: 12px; }
.row > button { margin-bottom: 12px; }

button, .button {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
button.ghost, .button.ghost { background: transparent; color: var(--text); border-color: var(--line); }
button.danger { background: transparent; color: var(--bad); border-color: var(--bad); }
button:disabled { opacity: 0.5; cursor: default; }

.actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tr.link { cursor: pointer; }
tr.link:hover td { background: var(--bg); }
.table-wrap { overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 4px 12px; }
.card .table-wrap { border: 0; padding: 0; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 99px; font-size: 12px; font-weight: 600; background: var(--line); color: var(--text); }
.badge.draft { background: var(--line); }
.badge.queued, .badge.sending { background: var(--accent); color: var(--accent-text); }
.badge.paused { background: var(--warn); color: #fff; }
.badge.done { background: var(--ok); color: #fff; }
.badge.cancelled { background: var(--idle); color: #fff; }

.bar { display: flex; height: 10px; border-radius: 99px; overflow: hidden; background: var(--line); margin: 8px 0 6px; min-width: 120px; }
.bar span { display: block; height: 100%; }
.bar .sent { background: var(--ok); }
.bar .blocked { background: var(--warn); }
.bar .failed { background: var(--bad); }
.legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: 13px; color: var(--muted); }
.legend b { color: var(--text); font-variant-numeric: tabular-nums; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 4px; vertical-align: middle; }
.dot.sent { background: var(--ok); }
.dot.blocked { background: var(--warn); }
.dot.failed { background: var(--bad); }
.dot.pending { background: var(--line); }

.meta { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; font-size: 14px; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; }

.bubble { background: var(--bubble); border-radius: 14px; padding: 12px 14px; }
.msg { white-space: pre-wrap; overflow-wrap: anywhere; min-height: 1.4em; }
.msg blockquote { margin: 4px 0; padding-left: 10px; border-left: 3px solid var(--accent); }
.msg pre, .msg code { font-family: ui-monospace, Menlo, monospace; font-size: 13px; }
.msg pre { margin: 4px 0; white-space: pre-wrap; }
.msg a { color: var(--accent); }
.kb { display: flex; flex-direction: column; gap: 4px; margin-top: 8px; }
.kb .kb-row { display: flex; gap: 4px; }
.kb .kb-row span { flex: 1; text-align: center; padding: 6px; border-radius: 8px; background: var(--card); font-size: 13px; font-weight: 600; }

.btn-row { display: flex; gap: 8px; align-items: flex-start; margin-bottom: 8px; flex-wrap: wrap; }
.btn-row .btn { display: flex; gap: 4px; flex: 1 1 220px; }
.btn-row .btn input { margin-top: 0; }
.btn-row input.t { flex: 0 0 40%; }

.muted { color: var(--muted); }
.small { font-size: 13px; }
.error { color: var(--bad); font-weight: 600; }
.ok { color: var(--ok); font-weight: 600; }
code { font-family: ui-monospace, Menlo, monospace; font-size: 0.92em; }
.empty { padding: 16px 0; color: var(--muted); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: 8px;
  max-width: 90vw;
  z-index: 5;
}
.toast.bad { background: var(--bad); color: #fff; }