:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --green: #4ade80;
  --red: #f87171;
  --amber: #fbbf24;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { background: #0b1220; padding: 1px 6px; border-radius: 4px; font-size: 0.9em; }

/* --- sidebar layout --- */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 215px; flex-shrink: 0; background: var(--panel);
  border-right: 1px solid var(--border); padding: 18px 0;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.brand { font-weight: 700; color: var(--text); font-size: 1.05rem;
  display: block; padding: 0 18px 14px; border-bottom: 1px solid var(--border); }
.sidebar nav { display: flex; flex-direction: column; padding: 10px 10px; }
.nav-group { color: var(--muted); font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: .08em; padding: 14px 10px 4px; }
.sidebar nav a {
  color: var(--text); padding: 8px 10px; border-radius: 7px; font-size: 0.92rem;
}
.sidebar nav a:hover { background: #26334b; text-decoration: none; }
.sidebar nav a.active { background: rgba(56,189,248,.14); color: var(--accent); font-weight: 600; }
.main { flex: 1; min-width: 0; }
@media (max-width: 760px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; padding: 8px 0; }
  .sidebar nav { flex-direction: row; flex-wrap: wrap; gap: 2px; }
  .nav-group { display: none; }
}

.container { max-width: 1100px; margin: 24px auto; padding: 0 20px; }

/* --- tabs --- */
.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--border);
  margin: 18px 0 0; flex-wrap: wrap; }
.tab-btn {
  background: none; border: none; color: var(--muted); padding: 9px 16px;
  font-size: 0.95rem; cursor: pointer; border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.flash-close { float: right; cursor: pointer; font-weight: 700; padding: 0 4px;
  opacity: .7; }
.flash-close:hover { opacity: 1; }
#refresh-stamp { color: var(--muted); font-size: 0.75rem; }

/* --- KPIs & charts --- */
.kpi-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; margin: 16px 0; }
@media (max-width: 900px) { .kpi-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 480px) { .kpi-grid { grid-template-columns: repeat(2, 1fr); } }
.kpi { background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px; text-align: center; }
.kpi-value { font-size: 1.9rem; font-weight: 700; color: var(--accent); line-height: 1; }
.kpi-label { color: var(--muted); font-size: 0.78rem; margin-top: 6px; }
.chart { min-height: 180px; display: flex; flex-direction: column; align-items: center;
  justify-content: center; }
.chart-svg { max-width: 100%; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; margin-top: 10px;
  font-size: 0.82rem; color: var(--muted); }
.legend i { display: inline-block; width: 11px; height: 11px; border-radius: 3px;
  margin-right: 5px; vertical-align: middle; }
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.actions { display: flex; gap: 8px; }
.actions form { margin: 0; }

.card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; padding: 20px; margin: 16px 0;
}
.card.narrow { max-width: 480px; margin: 40px auto; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; }
@media (max-width: 700px) { .grid2 { grid-template-columns: 1fr; } }

h1 { font-size: 1.4rem; } h2 { font-size: 1.05rem; color: var(--muted); }

label { display: block; margin: 12px 0; font-size: 0.9rem; color: var(--muted); }
input, select {
  display: block; width: 100%; margin-top: 4px; padding: 9px 10px;
  background: #0b1220; color: var(--text);
  border: 1px solid var(--border); border-radius: 6px; font-size: 0.95rem;
}
input:focus, select:focus { outline: none; border-color: var(--accent); }

.btn {
  display: inline-block; padding: 8px 14px; border-radius: 6px;
  border: 1px solid var(--border); background: #0b1220; color: var(--text);
  font-size: 0.9rem; cursor: pointer;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #06283d; font-weight: 600; }
.btn.danger { border-color: var(--red); color: var(--red); }

table.list { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
table.list th, table.list td { padding: 10px 12px; text-align: left; font-size: 0.9rem; }
table.list th { color: var(--muted); font-weight: 600; border-bottom: 1px solid var(--border); }
table.list tbody tr { border-bottom: 1px solid #24324a; }
table.list tbody tr:hover { background: #24324a; }

.status {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
}
.status-online { background: rgba(74,222,128,.15); color: var(--green); }
.status-offline { background: rgba(248,113,113,.15); color: var(--red); }
.status-pending { background: rgba(251,191,36,.15); color: var(--amber); }

.flash { padding: 10px 14px; border-radius: 8px; margin: 10px 0; font-size: 0.9rem; }
.flash-success { background: rgba(74,222,128,.12); border: 1px solid var(--green); }
.flash-error { background: rgba(248,113,113,.12); border: 1px solid var(--red); }
.flash-info { background: rgba(56,189,248,.12); border: 1px solid var(--accent); }

.script {
  background: #0b1220; border: 1px solid var(--border); border-radius: 8px;
  padding: 14px; overflow-x: auto; font-size: 0.8rem; line-height: 1.5;
  white-space: pre; color: #a5f3fc;
}
details { border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; margin: 10px 0; background: #0b1220; }
details summary { cursor: pointer; font-weight: 600; padding: 2px 0; }
details[open] summary { margin-bottom: 8px; border-bottom: 1px solid var(--border); padding-bottom: 8px; }

dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; margin: 0; }
dt { color: var(--muted); font-size: 0.85rem; } dd { margin: 0; font-size: 0.9rem; }
.muted { color: var(--muted); }
.cell-traffic .down { color: var(--green); margin-right: 8px; }
.cell-traffic .up   { color: var(--accent); }
.cell-rtt .spark { vertical-align: middle; }