:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --border: #e2e5ea;
  --text: #1b1f24;
  --muted: #667085;
  --primary: #2f6fed;
  --primary-ink: #ffffff;
  --success: #12805c;
  --success-bg: #e3f5ed;
  --warn: #9a6700;
  --warn-bg: #fff4d6;
  --danger: #c4320a;
  --danger-bg: #fdeae4;
  --info-bg: #e8f0fe;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  --radius: 10px;
  color-scheme: light;
}

/* data-theme="light" | "dark" ghi đè theo hệ điều hành */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1216;
    --surface: #171b21;
    --surface-2: #1e232b;
    --border: #2a313b;
    --text: #e6e9ee;
    --muted: #98a2b3;
    --primary: #5b8cff;
    --success: #3ecf8e;
    --success-bg: #12291f;
    --warn: #f5c451;
    --warn-bg: #2d2513;
    --danger: #ff7a59;
    --danger-bg: #2f1a14;
    --info-bg: #17223a;
    --shadow: none;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0f1216;
  --surface: #171b21;
  --surface-2: #1e232b;
  --border: #2a313b;
  --text: #e6e9ee;
  --muted: #98a2b3;
  --primary: #5b8cff;
  --success: #3ecf8e;
  --success-bg: #12291f;
  --warn: #f5c451;
  --warn-bg: #2d2513;
  --danger: #ff7a59;
  --danger-bg: #2f1a14;
  --info-bg: #17223a;
  --shadow: none;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12.5px; }
h1 { font-size: 20px; margin: 0; }
h2 { font-size: 16px; margin: 0 0 12px; }
h3 { font-size: 15px; margin: 0; }
a { color: var(--primary); }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; }
.logo { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--primary); color: var(--primary-ink); font-weight: 800; }

/* login */
.login { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.login-card { width: 100%; max-width: 360px; padding: 28px; display: grid; gap: 14px; }

/* layout */
.shell { display: grid; grid-template-columns: 232px 1fr; min-height: 100%; }
.sidebar { background: var(--surface); border-right: 1px solid var(--border); padding: 18px 12px; display: flex; flex-direction: column; gap: 18px; position: sticky; top: 0; height: 100vh; }
.sidebar .brand { padding: 0 8px; }
#nav { display: grid; gap: 2px; }
#nav a { display: flex; align-items: center; justify-content: space-between; padding: 8px 10px; border-radius: 8px; color: var(--text); text-decoration: none; }
#nav a:hover { background: var(--surface-2); }
#nav a.active { background: var(--info-bg); color: var(--primary); font-weight: 600; }
.sidebar-foot { margin-top: auto; display: grid; gap: 8px; padding: 0 8px; }
.view { padding: 24px; min-width: 0; }
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; flex-direction: row; flex-wrap: wrap; align-items: center; padding: 10px 16px; }
  #nav { display: flex; flex-wrap: wrap; gap: 4px; }
  .sidebar-foot { margin: 0 0 0 auto; display: flex; align-items: center; }
  .view { padding: 16px; }
}

/* controls */
input, select, textarea {
  font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 10px; width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: transparent; }
label { display: grid; gap: 4px; font-size: 13px; color: var(--muted); }
label > input, label > select, label > textarea { color: var(--text); }
.btn {
  font: inherit; display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer; white-space: nowrap;
}
.btn:hover { background: var(--surface-2); }
.btn:disabled { opacity: .55; cursor: default; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn.primary:hover { filter: brightness(1.07); }
.btn.danger { color: var(--danger); border-color: var(--danger); background: transparent; }
.btn.danger:hover { background: var(--danger-bg); }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.small { padding: 4px 8px; font-size: 12.5px; }
.icon-btn { border: 0; background: transparent; color: var(--muted); font-size: 22px; line-height: 1; cursor: pointer; }
.toolbar { display: flex; gap: 8px; flex-wrap: wrap; align-items: end; margin-bottom: 12px; }
.toolbar > * { width: auto; }
.toolbar input[type=search] { min-width: 220px; }
.row-actions { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 600px) { .form-grid { grid-template-columns: 1fr; } }
.form-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }

/* tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
th { font-size: 12px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .02em; background: var(--surface-2); }
tbody tr:hover { background: var(--surface-2); }
tr.clickable { cursor: pointer; }
td.wide { min-width: 220px; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.empty { padding: 28px; text-align: center; color: var(--muted); }
.pager { display: flex; justify-content: space-between; align-items: center; padding: 10px 12px; gap: 8px; }

/* pills */
.pill { display: inline-block; white-space: nowrap; padding: 1px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--surface-2); color: var(--muted); }
.pill.ok { background: var(--success-bg); color: var(--success); }
.pill.warn { background: var(--warn-bg); color: var(--warn); }
.pill.bad { background: var(--danger-bg); color: var(--danger); }
.pill.info { background: var(--info-bg); color: var(--primary); }
.badge { background: var(--danger); color: #fff; border-radius: 999px; font-size: 11px; padding: 0 7px; font-weight: 700; }

/* dashboard */
.stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { padding: 14px 16px; }
.stat .label { color: var(--muted); font-size: 12.5px; }
.stat .value { font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; margin-top: 2px; }
.stat .sub { font-size: 12px; color: var(--muted); }
.stat.alert .value { color: var(--warn); }
.grid-2 { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 16px; }
@media (max-width: 1000px) { .grid-2 { grid-template-columns: 1fr; } }
.panel { padding: 16px; }
.chart { display: flex; align-items: flex-end; gap: 3px; height: 150px; padding-top: 8px; }
.chart .bar { flex: 1; display: flex; flex-direction: column-reverse; min-width: 0; height: 100%; }
.chart .seg-ok { background: var(--primary); border-radius: 3px 3px 0 0; }
.chart .seg-bad { background: var(--danger); opacity: .8; }
.chart-axis { display: flex; justify-content: space-between; font-size: 11px; color: var(--muted); margin-top: 4px; }
.legend { display: flex; gap: 14px; font-size: 12px; color: var(--muted); }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: -1px; }

/* detail */
.kv { display: grid; grid-template-columns: 160px 1fr; gap: 6px 12px; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; word-break: break-word; }
.section { margin-top: 20px; }
.section-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip { display: inline-flex; align-items: center; gap: 4px; padding: 2px 4px 2px 10px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); font-size: 12.5px; }
.chip button { border: 0; background: transparent; color: var(--muted); cursor: pointer; font-size: 15px; line-height: 1; }
.secret-box { padding: 12px; border-radius: 8px; background: var(--warn-bg); border: 1px solid var(--warn); }
.secret-box code { display: block; margin-top: 6px; word-break: break-all; white-space: pre-wrap; }

/* modal & toast */
.modal { position: fixed; inset: 0; background: rgba(15, 18, 22, .45); display: grid; place-items: center; padding: 16px; z-index: 20; }
.modal-box { width: 100%; max-width: 720px; max-height: calc(100vh - 32px); overflow: auto; padding: 20px; }
.modal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.toasts { position: fixed; right: 16px; bottom: 16px; display: grid; gap: 8px; z-index: 30; }
.toast { padding: 10px 14px; border-radius: 8px; background: var(--text); color: var(--bg); box-shadow: var(--shadow); max-width: 360px; }
.toast.err { background: var(--danger); color: #fff; }
.row-actions.start { justify-content: flex-start; }

.theme-corner { position: fixed; top: 12px; right: 12px; z-index: 5; }