:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-2: #f8fafb;
  --border: #e2e7ec;
  --text: #16202a;
  --muted: #5d6b78;
  --brand: #0f766e;
  --brand-hover: #0d645d;
  --brand-soft: #e6f3f1;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --warn: #9a6700;
  --warn-soft: #fff4d6;
  --ok: #18794e;
  --ok-soft: #e5f5ec;
  --info: #1d5fbf;
  --info-soft: #e8f0fc;
  --shadow: 0 1px 2px rgb(16 24 40 / 6%), 0 1px 3px rgb(16 24 40 / 8%);
  --radius: 10px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "Consolas", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1418;
    --surface: #151d22;
    --surface-2: #1a242a;
    --border: #273239;
    --text: #e6ecef;
    --muted: #93a2ad;
    --brand: #2bb3a3;
    --brand-hover: #3cc4b4;
    --brand-soft: #12302c;
    --danger: #f97066;
    --danger-soft: #3a1714;
    --warn: #f5b83d;
    --warn-soft: #33270b;
    --ok: #47c98a;
    --ok-soft: #10301f;
    --info: #79a8f0;
    --info-soft: #14243b;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--text); font: 14px/1.5 var(--font); }
a { color: var(--brand); }
h1, h2, h3 { line-height: 1.25; margin: 0; }
h1 { font-size: 22px; font-weight: 650; }
h2 { font-size: 16px; font-weight: 650; }
h3 { font-size: 14px; font-weight: 650; }
code, .mono { font-family: var(--mono); font-size: 12.5px; }
[hidden] { display: none !important; }

/* ---------- login ---------- */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: 100%; max-width: 380px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; box-shadow: var(--shadow); padding: 32px 28px; }
.login-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
.login-brand img { width: 40px; height: 40px; }
.login-brand small { display: block; color: var(--muted); font-size: 13px; }
.login-card form { display: grid; gap: 14px; }

/* ---------- shell ---------- */
.shell { display: grid; grid-template-columns: 232px 1fr; min-height: 100vh; }
.sidebar { background: var(--surface); border-right: 1px solid var(--border); padding: 18px 12px;
  display: flex; flex-direction: column; gap: 4px; position: sticky; top: 0; height: 100vh; }
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 8px 18px; font-weight: 650; }
.brand img { width: 30px; height: 30px; }
.brand small { display: block; font-weight: 400; color: var(--muted); font-size: 12px; }
.nav a { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px;
  color: var(--text); text-decoration: none; font-weight: 500; }
.nav a:hover { background: var(--surface-2); }
.nav a.active { background: var(--brand-soft); color: var(--brand); }
.nav svg { width: 18px; height: 18px; flex: none; }
.sidebar .spacer { flex: 1; }
.userbox { border-top: 1px solid var(--border); padding: 12px 8px 0; display: grid; gap: 6px; }
.userbox .who { font-weight: 600; }
.userbox .role { color: var(--muted); font-size: 12px; }
.main { padding: 28px 32px 48px; min-width: 0; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head p { margin: 4px 0 0; color: var(--muted); }
.topbar { display: none; }

/* ---------- cards / grid ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.card-pad { padding: 18px 20px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 20px;
  border-bottom: 1px solid var(--border); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 20px; }
.stat { padding: 16px 18px; }
.stat .label { color: var(--muted); font-size: 12.5px; }
.stat .value { font-size: 26px; font-weight: 650; font-variant-numeric: tabular-nums; margin-top: 2px; }
.senders { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.sender { padding: 18px 20px; display: grid; gap: 12px; text-decoration: none; color: inherit; }
.sender:hover { border-color: var(--brand); }
.sender .row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.sender .name { font-weight: 650; font-size: 15px; }
.sender .meta { color: var(--muted); font-size: 13px; display: grid; gap: 2px; }
.split { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 16px; align-items: start; }
.stack { display: grid; gap: 16px; }
dl.kv { display: grid; grid-template-columns: 130px 1fr; gap: 8px 12px; margin: 0; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; overflow-wrap: anywhere; }

/* ---------- status chips ---------- */
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 2px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600; white-space: nowrap; background: var(--surface-2); color: var(--muted); }
.chip::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.chip.ok { background: var(--ok-soft); color: var(--ok); }
.chip.warn { background: var(--warn-soft); color: var(--warn); }
.chip.bad { background: var(--danger-soft); color: var(--danger); }
.chip.info { background: var(--info-soft); color: var(--info); }

/* ---------- forms ---------- */
label.field { display: grid; gap: 6px; font-weight: 550; font-size: 13px; }
label.field small { font-weight: 400; color: var(--muted); }
input, select, textarea { font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 9px 11px; width: 100%; }
textarea { resize: vertical; min-height: 84px; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--brand); outline-offset: -1px; border-color: var(--brand); }
.form-grid { display: grid; gap: 14px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.actions.end { justify-content: flex-end; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; font: inherit; font-weight: 600;
  border-radius: 8px; padding: 8px 14px; border: 1px solid var(--border); background: var(--surface); color: var(--text);
  cursor: pointer; text-decoration: none; white-space: nowrap; }
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-hover); }
.btn.danger { color: var(--danger); }
.btn.danger:hover { background: var(--danger-soft); }
.btn.small { padding: 5px 10px; font-size: 13px; }
.btn svg { width: 18px; height: 18px; flex: none; }
.btn.block { width: 100%; padding: 10px 14px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.linkbtn { background: none; border: 0; padding: 0; color: var(--muted); font: inherit; cursor: pointer; text-align: left; }
.linkbtn:hover { color: var(--text); text-decoration: underline; }

.alert { padding: 10px 14px; border-radius: 8px; font-size: 13.5px; }
.alert.error { background: var(--danger-soft); color: var(--danger); }
.alert.info { background: var(--info-soft); color: var(--info); }
.alert.warn { background: var(--warn-soft); color: var(--warn); }
.muted { color: var(--muted); }
.empty { padding: 36px 20px; text-align: center; color: var(--muted); }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-size: 12px; font-weight: 600; color: var(--muted); background: var(--surface-2); white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td.num { font-variant-numeric: tabular-nums; }
td .sub { display: block; color: var(--muted); font-size: 12.5px; }
.msg-body { max-width: 520px; white-space: pre-wrap; overflow-wrap: anywhere; }

/* ---------- QR ---------- */
.qr-box { display: grid; place-items: center; gap: 12px; text-align: center; padding: 20px; }
.qr-box img { width: 264px; height: 264px; image-rendering: pixelated; background: #fff; padding: 8px; border-radius: 8px; }
.steps { margin: 0; padding-left: 18px; color: var(--muted); text-align: left; display: grid; gap: 4px; }

/* ---------- secret box ---------- */
.secret { display: flex; gap: 8px; align-items: center; background: var(--surface-2); border: 1px dashed var(--border);
  border-radius: 8px; padding: 10px 12px; }
.secret code { flex: 1; overflow-wrap: anywhere; }
pre.snippet { background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 12px;
  overflow-x: auto; font-family: var(--mono); font-size: 12.5px; margin: 0; }

/* ---------- modal / toast ---------- */
dialog { border: 1px solid var(--border); border-radius: 14px; padding: 0; width: min(560px, calc(100vw - 32px));
  background: var(--surface); color: var(--text); box-shadow: 0 20px 50px rgb(0 0 0 / 25%); }
dialog::backdrop { background: rgb(10 16 20 / 45%); }
.modal-head { padding: 18px 22px 0; }
.modal-head p { margin: 6px 0 0; color: var(--muted); }
.modal-body { padding: 18px 22px; display: grid; gap: 14px; }
.modal-foot { padding: 14px 22px 18px; display: flex; justify-content: flex-end; gap: 8px; border-top: 1px solid var(--border); }
#toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg);
  padding: 10px 16px; border-radius: 8px; font-weight: 550; z-index: 10; max-width: calc(100vw - 32px); }
#toast.error { background: var(--danger); color: #fff; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: fixed; inset: 0 auto 0 0; width: 260px; z-index: 5; transform: translateX(-100%); transition: transform .18s; }
  .shell.nav-open .sidebar { transform: none; box-shadow: 0 0 40px rgb(0 0 0 / 30%); }
  .topbar { display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--surface);
    border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 4; }
  .topbar img { width: 26px; height: 26px; }
  .main { padding: 18px 16px 40px; }
  .form-row { grid-template-columns: 1fr; }
  dl.kv { grid-template-columns: 1fr; gap: 2px; }
  dl.kv dd { margin-bottom: 8px; }
}
td.nowrap { white-space: nowrap; }

/* ---------- v2: dashboard, chart, users ---------- */
:root { --series-1: #2a78d6; --series-2: #eb6834; }
@media (prefers-color-scheme: dark) { :root { --series-1: #3987e5; --series-2: #d95926; } }

.nav-extra { border-top: 1px solid var(--border); margin-top: 8px; padding-top: 8px; }
.stat .sub { color: var(--muted); font-size: 12.5px; margin-top: 2px; }
.stat.warn .value { color: var(--warn); }
.stat.bad .value { color: var(--danger); }
.split.wide { grid-template-columns: minmax(0, 1fr) 320px; }
.narrow { max-width: 560px; }
.right { text-align: right; }
.text-bad { color: var(--danger); font-weight: 600; }
tr.clickable { cursor: pointer; }
tr.clickable:hover td { background: var(--surface-2); }
tr.dim td { opacity: .6; }
.chip.small { font-size: 11px; padding: 0 8px; margin-left: 6px; }
.chip.small::before { display: none; }
.linkbtn.center { justify-self: center; margin-top: 14px; display: block; margin-inline: auto; }
.btn svg { width: 16px; height: 16px; }

.attention { margin-bottom: 16px; border-color: var(--warn); }
.issue-list, .activity { list-style: none; margin: 0; padding: 0; }
.issue-list li { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 20px; border-top: 1px solid var(--border); }
.issue-list li:first-child { border-top: 0; }
.issue-list .sub, .activity .sub { display: block; color: var(--muted); font-size: 12.5px; }
.activity li { display: flex; gap: 10px; padding: 10px 20px; border-top: 1px solid var(--border); }
.activity li:first-child { border-top: 0; }
.activity .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--brand); margin-top: 7px; flex: none; }
.activity .dot.bad { background: var(--danger); }

.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg button { font: inherit; font-size: 13px; padding: 5px 12px; border: 0; background: var(--surface); color: var(--muted); cursor: pointer; }
.seg button + button { border-left: 1px solid var(--border); }
.seg button.on { background: var(--brand-soft); color: var(--brand); font-weight: 600; }

.chart .legend { display: flex; align-items: center; gap: 16px; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.chart .legend > span { display: inline-flex; align-items: center; gap: 6px; }
.chart .legend .spacer { flex: 1; }
.sw { display: inline-block; width: 10px; height: 10px; border-radius: 3px; vertical-align: -1px; margin-right: 6px; }
.sw.s1 { background: var(--series-1); }
.sw.s2 { background: var(--series-2); }
.chart-plot { position: relative; }
.chart-svg { width: 100%; height: auto; display: block; overflow: visible; }
.chart-svg .grid { stroke: var(--border); stroke-width: 1; }
.chart-svg .axis { stroke: var(--muted); stroke-width: 1; opacity: .5; }
.chart-svg .tick { fill: var(--muted); font-size: 11px; font-family: var(--font); }
.chart-svg .s1 { fill: var(--series-1); }
.chart-svg .s2 { fill: var(--series-2); }
.chart-svg .hit { fill: transparent; }
.chart-svg .grp.hover .hit { fill: var(--surface-2); }
.chart-tip { position: absolute; top: 0; transform: translateX(-50%); background: var(--surface); border: 1px solid var(--border);
  box-shadow: 0 6px 20px rgb(0 0 0 / 15%); border-radius: 8px; padding: 8px 10px; font-size: 12.5px; pointer-events: none; white-space: nowrap; z-index: 2; }
.chart-tip strong { display: block; margin-bottom: 2px; }

.user-cell { display: flex; align-items: center; gap: 10px; }
.user-cell .sub { display: block; color: var(--muted); font-size: 12.5px; }
.avatar { width: 34px; height: 34px; border-radius: 50%; background: var(--brand-soft); color: var(--brand); display: grid; place-items: center;
  font-weight: 650; font-size: 13px; flex: none; }
.menu-wrap { position: relative; display: inline-block; }
.menu { position: absolute; right: 0; top: calc(100% + 4px); background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 10px 30px rgb(0 0 0 / 18%); padding: 4px; min-width: 190px; z-index: 6; display: grid; text-align: left; }
.menu-item { font: inherit; background: none; border: 0; padding: 8px 10px; border-radius: 6px; text-align: left; cursor: pointer; color: var(--text); }
.menu-item:hover { background: var(--surface-2); }
.menu-item.danger { color: var(--danger); }
label.check { display: flex; align-items: center; gap: 8px; font-size: 13.5px; cursor: pointer; }
label.check input { width: auto; }
.table-wrap { overflow: visible; }
@media (max-width: 1100px) { .split.wide { grid-template-columns: 1fr; } }
@media (max-width: 760px) { .table-wrap { overflow-x: auto; } }