:root {
  --bg: #f4f6fa; --card: #fff; --text: #172033; --muted: #66708a; --line: #e2e6ef;
  --brand: #2557d6; --brand-ink: #fff; --ok: #12805c; --ok-bg: #e6f6ef; --err: #c0362c; --err-bg: #fdecea;
  --warn: #9a6200; --warn-bg: #fff4dc; --code: #0f172a; --code-ink: #e2e8f0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1420; --card: #171e2e; --text: #e6eaf3; --muted: #95a0b8; --line: #2a3347;
    --brand: #5b8cff; --ok: #4cc79a; --ok-bg: #12352a; --err: #ff7b72; --err-bg: #3a1a1a;
    --warn: #f0b85a; --warn-bg: #3a2c12; --code: #0a0e17;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 22px; margin: 0 0 12px; }
h2 { font-size: 17px; margin: 0 0 10px; }

.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 12px 24px; background: var(--card); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; color: var(--text); }
.brand svg { color: var(--brand); }
.top nav { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
main { max-width: 1100px; margin: 24px auto; padding: 0 16px; }
.foot { text-align: center; padding: 24px; font-size: 13px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 20px; margin-bottom: 16px; }
.card.narrow { max-width: 440px; margin: 40px auto; }
.card.danger { border-color: var(--err); }
.row-between { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.mono { font-family: ui-monospace, Consolas, monospace; font-size: 13px; }
.num { text-align: right; white-space: nowrap; }
.spaced { margin-top: 12px; }
.grow { flex: 1; }

.form { display: flex; flex-direction: column; gap: 12px; }
.form.row { flex-direction: row; align-items: flex-end; flex-wrap: wrap; }
.form.row input { flex: 1; min-width: 200px; }
.form.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); align-items: end; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; font-weight: 500; }
label.check { flex-direction: row; align-items: center; gap: 8px; font-weight: 400; }
input { font: inherit; padding: 9px 11px; border: 1px solid var(--line); border-radius: 7px; background: var(--bg); color: var(--text); }
input:focus { outline: 2px solid var(--brand); outline-offset: -1px; }
form.inline { display: inline; }
.card.wide { max-width: 920px; margin: 24px auto; }
.step { display: flex; align-items: center; gap: 10px; margin: 18px 0 4px; }
.step h2 { margin: 0; }
.step-no { width: 26px; height: 26px; border-radius: 50%; background: var(--brand); color: var(--brand-ink); display: grid; place-items: center; font-size: 13px; font-weight: 700; }
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; }
.plan { position: relative; display: flex; flex-direction: column; gap: 6px; padding: 16px; border: 1.5px solid var(--line); border-radius: 12px; cursor: pointer; font-weight: 400; transition: border-color .15s, box-shadow .15s; }
.plan:hover { border-color: var(--brand); }
.plan input { position: absolute; opacity: 0; pointer-events: none; }
.plan:has(input:checked) { border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent); }
.plan:has(input:focus-visible) { outline: 2px solid var(--brand); outline-offset: 2px; }
.plan.disabled { opacity: .5; cursor: not-allowed; }
.plan-head { display: flex; justify-content: space-between; align-items: center; }
.plan-name { font-size: 17px; font-weight: 700; }
.plan-radio { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--line); }
.plan:has(input:checked) .plan-radio { border: 5px solid var(--brand); }
.plan-tag { color: var(--muted); font-size: 13px; }
.plan-price b { font-size: 20px; }
.plan-feat { list-style: none; margin: 4px 0 0; padding: 0; display: grid; gap: 4px; font-size: 13px; }
.plan-feat li { display: flex; gap: 6px; align-items: flex-start; }
.plan-feat svg { color: var(--ok); flex: none; margin-top: 3px; }
.plan-admin { font-size: 12px; color: var(--warn); border-top: 1px dashed var(--line); padding-top: 6px; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
label.check.boxed { align-items: flex-start; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; align-self: end; }
.block { display: block; font-weight: 400; }
textarea { font: inherit; padding: 9px 11px; border: 1px solid var(--line); border-radius: 7px; background: var(--bg); color: var(--text); resize: vertical; }
.copy { cursor: pointer; border-bottom: 1px dashed var(--line); word-break: break-all; }
.copy:hover { color: var(--brand); }
.copy.copied::after { content: " · đã chép"; color: var(--ok); font-family: system-ui, sans-serif; }
.row-gap { display: flex; gap: 8px; flex-wrap: wrap; }
.nowrap { white-space: nowrap; }
.bar { display: block; height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; margin: 6px 0 4px; }
.bar-fill { display: block; height: 100%; width: 0; background: var(--brand); }
.bar-fill.hot { background: var(--err); }
.neg { color: var(--err); }
.pos { color: var(--ok); }
.pkg { cursor: default; }
select { font: inherit; padding: 9px 11px; border: 1px solid var(--line); border-radius: 7px; background: var(--bg); color: var(--text); }
form.money { display: inline-flex; gap: 6px; }
form.money input { width: 150px; padding: 5px 8px; }
.pkg .btn { margin-top: 6px; }
.pkg-price { font-size: 18px; font-weight: 700; }
.summary { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; border-top: 1px solid var(--line); padding-top: 14px; margin-top: 6px; }
.inline-b { font-size: 14px; margin: 0; }
.stat .small { margin-top: 2px; }

.btn { display: inline-block; font: inherit; font-weight: 600; padding: 9px 16px; border: 0; border-radius: 7px;
  background: var(--brand); color: var(--brand-ink); cursor: pointer; }
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn.secondary { background: transparent; color: var(--brand); border: 1px solid var(--brand); }
.btn.danger { background: var(--err); color: #fff; }
.btn.small { padding: 4px 10px; font-size: 13px; }
button.link { background: none; border: 0; color: var(--brand); font: inherit; cursor: pointer; padding: 0; }

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

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; display: flex; flex-direction: column; }
.stat b { font-size: 20px; margin-top: 4px; }
.card .stats .stat { background: var(--bg); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 9px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
th { color: var(--muted); font-weight: 600; font-size: 13px; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--bg); color: var(--muted); }
.badge.active { background: var(--ok-bg); color: var(--ok); }
.badge.error, .badge.blocked { background: var(--err-bg); color: var(--err); }
.badge.pending { background: var(--warn-bg); color: var(--warn); }

.kv { display: grid; grid-template-columns: 120px 1fr; gap: 6px 12px; margin: 0 0 8px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }
.code { background: var(--code); color: var(--code-ink); padding: 12px 14px; border-radius: 8px; overflow-x: auto; font-family: ui-monospace, Consolas, monospace; font-size: 13px; }

@media (max-width: 600px) {
  .top { padding: 10px 16px; }
  .kv { grid-template-columns: 1fr; }
  .kv dt { margin-top: 6px; }
}