:root {
  --bg: #f4f1ea;
  --card: #fffdf8;
  --ink: #1f2420;
  --muted: #6b716b;
  --line: #ddd6c8;
  --accent: #2f6b4f;
  --accent-ink: #fff;
  --ok: #2f7a4a;
  --ok-bg: #e3f2e7;
  --warn: #8a5a00;
  --warn-bg: #fdf0d2;
  --err: #a32f2f;
  --err-bg: #fbe3e1;
  --radius: 10px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161a17;
    --card: #1f2420;
    --ink: #e8e6df;
    --muted: #9aa198;
    --line: #333a34;
    --accent: #5fae86;
    --accent-ink: #0d1510;
    --ok: #7fd09a;
    --ok-bg: #1d3325;
    --warn: #f0c060;
    --warn-bg: #3a2f14;
    --err: #ff8f86;
    --err-bg: #3d1d1b;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}
a { color: var(--accent); }
code { font: 13px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; }
code.wrap { word-break: break-all; }
h1 { font-size: 1.5rem; margin: 0 0 16px; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }
h3 { font-size: 1rem; margin: 16px 0 6px; }
.muted { color: var(--muted); }
.hint { color: var(--muted); font-size: 13px; }
.warn-text { color: var(--warn); }
hr { border: 0; border-top: 1px solid var(--line); margin: 16px 0; }

.top {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px;
  padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; color: var(--ink); text-decoration: none; font-size: 17px; }
.brand span { color: var(--accent); font-weight: 600; }
.nav { display: flex; flex-wrap: wrap; gap: 4px; flex: 1; }
.nav a, .who a { padding: 6px 10px; border-radius: 8px; text-decoration: none; color: var(--ink); }
.nav a.on, .who a.on { background: var(--accent); color: var(--accent-ink); }
.who { display: flex; align-items: center; gap: 6px; }
.who form { margin: 0; }

.page { max-width: 1100px; margin: 0 auto; padding: 20px 16px 48px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; margin-bottom: 16px; min-width: 0;
}
.card.narrow { max-width: 420px; margin: 32px auto; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.grid2 > .card { margin-bottom: 0; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; }
.stat span { color: var(--muted); font-size: 13px; display: block; }
.stat strong { font-size: 28px; font-variant-numeric: tabular-nums; }

.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0 0 12px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }

.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; font-weight: 600;
  background: var(--line); color: var(--ink); white-space: nowrap;
}
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.err { background: var(--err-bg); color: var(--err); }
.badge.muted { color: var(--muted); }

.flash, .notice { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; }
.flash-ok { background: var(--ok-bg); color: var(--ok); }
.flash-err, .notice.err { background: var(--err-bg); color: var(--err); }
.notice.warn { background: var(--warn-bg); color: var(--warn); }

blockquote {
  margin: 0 0 12px; padding: 8px 12px; border-left: 3px solid var(--accent);
  background: var(--bg); border-radius: 0 8px 8px 0; white-space: pre-wrap;
}

form { margin: 0 0 12px; }
.stack { display: grid; gap: 12px; }
.stack label, .inline label { display: grid; gap: 4px; font-weight: 600; font-size: 14px; }
.inline { display: flex; flex-wrap: wrap; align-items: end; gap: 8px; }
input, textarea, select {
  font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 10px; width: 100%; min-width: 0;
}
textarea { resize: vertical; }
input[type=radio] { width: auto; }
.choices {
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px;
  display: flex; flex-wrap: wrap; gap: 4px 16px; margin: 0;
}
.choices legend { font-weight: 600; font-size: 14px; padding: 0 4px; }
.stack .choice, .choice { display: inline-flex; align-items: center; gap: 6px; font-weight: 400; }
button {
  font: inherit; font-weight: 600; cursor: pointer; padding: 8px 14px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
}
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
button.danger { background: var(--err); border-color: var(--err); color: #fff; }
button.link { background: none; border: 0; padding: 6px 10px; color: var(--muted); font-weight: 400; }
button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
details summary { cursor: pointer; color: var(--muted); margin: 8px 0; }

.search { display: flex; gap: 8px; margin-bottom: 12px; }
.search input { flex: 1; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 13px; color: var(--muted); font-weight: 600; white-space: nowrap; }
td.detail { max-width: 360px; overflow-wrap: anywhere; }
.pager { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; }

@media (max-width: 720px) {
  .grid2 { grid-template-columns: 1fr; }
  .stats { gap: 8px; }
  .stat { padding: 10px; }
  .stat strong { font-size: 22px; }
  .nav { order: 3; flex-basis: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .nav a { white-space: nowrap; }
  .who { margin-left: auto; }
  .kv { grid-template-columns: 1fr; gap: 0; }
  .kv dd { margin-bottom: 8px; }
  /* Bảng thành thẻ trên điện thoại. */
  table.rows thead { display: none; }
  table.rows, table.rows tbody, table.rows tr, table.rows td { display: block; width: 100%; }
  table.rows tr { border: 1px solid var(--line); border-radius: 8px; margin-bottom: 10px; padding: 6px 10px; }
  table.rows td { border: 0; padding: 3px 0; display: flex; gap: 12px; justify-content: space-between; }
  table.rows td::before { content: attr(data-label); color: var(--muted); font-size: 13px; flex-shrink: 0; }
  td.detail { max-width: none; }
}
button:disabled { opacity: 0.5; cursor: not-allowed; }