:root {
  --bg: #0b1220;
  --panel: #111a2b;
  --panel2: #162236;
  --line: #24344e;
  --ink: #e7eef9;
  --muted: #8fa3bf;
  --ok: #35d07f;
  --warn: #f5b84b;
  --err: #ff6b6b;
  --info: #58a6ff;
  --primary: #3b82f6;
  --radius: 12px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: radial-gradient(1200px 600px at 20% -10%, #172845 0%, var(--bg) 55%);
  color: var(--ink);
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
a { color: var(--info); text-decoration: none; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 16px;
  padding: 10px 20px; background: rgba(11,18,32,.9);
  border-bottom: 1px solid var(--line); backdrop-filter: blur(8px);
}
.brand { font-weight: 700; letter-spacing: .2px; white-space: nowrap; }
.topbar nav { display: flex; gap: 14px; flex-wrap: wrap; }
.topbar nav a { color: var(--muted); font-size: .9rem; }
.topbar nav a:hover { color: var(--ink); }
.logout { margin-left: auto; }
main { max-width: 1320px; margin: 0 auto; padding: 18px 20px 60px; }
h1, h2, h3 { margin: 0 0 10px; font-weight: 650; }
h2 { font-size: 1.1rem; }
h3 { font-size: .95rem; color: var(--muted); }
.card {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel2) 100%);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; margin-bottom: 16px;
}
.toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.spacer { flex: 1; }
.grid { display: grid; gap: 10px; }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.stat { background: #0e1728; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.stat .label { color: var(--muted); font-size: .76rem; }
.stat .value { font-size: 1.25rem; font-weight: 700; margin-top: 2px; }
.btn {
  appearance: none; border: 1px solid var(--line); background: #17243a; color: var(--ink);
  border-radius: 9px; padding: 7px 12px; cursor: pointer; font: inherit;
}
.btn:hover { border-color: #3a5378; }
.btn.sm { padding: 5px 9px; font-size: .82rem; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.danger { background: #7f1d1d; border-color: #b91c1c; color: #fff; }
.btn.ghost { background: transparent; }
textarea, input, select {
  width: 100%; background: #0b1424; color: var(--ink); border: 1px solid var(--line);
  border-radius: 8px; padding: 7px 9px; font: inherit;
}
textarea { resize: vertical; }
label { display: flex; flex-direction: column; gap: 5px; color: var(--muted); font-size: .82rem; }
label.check { flex-direction: row; align-items: center; gap: 6px; }
label.check input { width: auto; }
.hint { color: var(--muted); font-size: .82rem; }
.muted { color: var(--muted); }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: .72rem; font-weight: 600; }
.badge.ok { background: rgba(53,208,127,.16); color: var(--ok); }
.badge.warn { background: rgba(245,184,75,.16); color: var(--warn); }
.badge.err { background: rgba(255,107,107,.16); color: var(--err); }
.badge.info { background: rgba(88,166,255,.16); color: var(--info); }
.badge.off { background: rgba(143,163,191,.14); color: var(--muted); }
.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 10px; }
table { width: 100%; border-collapse: collapse; min-width: 800px; }
th, td { padding: 7px 9px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--muted); font-size: .76rem; font-weight: 600; background: #0e1728; position: sticky; top: 0; }
tr:last-child td { border-bottom: 0; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .8rem; }
.progress { height: 6px; background: #0b1424; border-radius: 999px; overflow: hidden; min-width: 90px; }
.progress > span { display: block; height: 100%; background: linear-gradient(90deg, #2563eb, #35d07f); }
.toast {
  position: fixed; right: 18px; bottom: 18px; z-index: 50;
  background: #0f1b2e; border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 14px; max-width: 420px; box-shadow: 0 10px 30px rgba(0,0,0,.4);
}
.toast.ok { border-color: var(--ok); }
.toast.err { border-color: var(--err); }
.alert { padding: 9px 12px; border-radius: 8px; margin-bottom: 10px; }
.alert.err { background: rgba(255,107,107,.12); border: 1px solid rgba(255,107,107,.5); }
.login-page { display: grid; place-items: center; min-height: 100vh; }
.login-box { width: min(420px, 92vw); background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 22px; }
.login-box form { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.login-box label { color: var(--muted); }
@media (max-width: 900px) {
  .grid.cols-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .grid.cols-3 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .grid.cols-2 { grid-template-columns: 1fr; }
  .topbar { flex-wrap: wrap; gap: 8px; }
  .topbar nav { order: 3; width: 100%; overflow-x: auto; padding-bottom: 2px; }
  main { padding: 12px; }
}

.pager { display: flex; align-items: center; gap: 10px; margin-top: 10px; }
.btn:disabled { opacity: .4; cursor: not-allowed; }

.settings-note {
  background: rgba(88,166,255,.08);
  border: 1px solid rgba(88,166,255,.28);
  border-radius: 10px;
  padding: 10px 12px;
  margin: 8px 0 4px;
  color: var(--ink);
  font-size: .86rem;
}
.settings-note strong { color: var(--info); }
#cau-hinh h3 { margin-top: 18px; }
label small.hint { color: var(--muted); font-size: .76rem; line-height: 1.35; }
.settings-checks { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 10px; }
.check-card {
  flex-direction: row; align-items: flex-start; gap: 9px;
  background: #0e1728; border: 1px solid var(--line); border-radius: 10px;
  padding: 10px; color: var(--ink); font-size: .86rem;
}
.check-card input { width: auto; margin-top: 3px; flex: 0 0 auto; }
.check-card span { display: flex; flex-direction: column; gap: 3px; }
.check-card small { color: var(--muted); font-size: .76rem; line-height: 1.35; }
@media (max-width: 900px) { .settings-checks { grid-template-columns: 1fr; } }