:root {
  --bg: #f4f6f8; --panel: #fff; --ink: #1f2933; --muted: #677480;
  --line: #e1e7ec; --brand: #0b6e6e; --brand-d: #084f4f;
  --ok: #1a7f37; --warn: #b26a00; --alarm: #c62828; --crit: #b71c1c;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--ink); font-size: 14px; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
code { background: #eef2f4; padding: 1px 5px; border-radius: 4px; font-size: .92em; }

.topbar { display: flex; align-items: center; gap: 24px; background: var(--brand);
  color: #fff; padding: 0 20px; height: 52px; }
.topbar a { color: #fff; }
.topbar .brand a { font-weight: 700; font-size: 1.05rem; }
.topbar nav { display: flex; gap: 18px; }
.topbar .user { margin-left: auto; display: flex; align-items: center; gap: 14px; }

.container { max-width: 1180px; margin: 22px auto; padding: 0 20px; }
.footer { max-width: 1180px; margin: 30px auto; padding: 12px 20px; color: var(--muted);
  font-size: 12px; border-top: 1px solid var(--line); }
h1 { font-size: 1.5rem; margin: 0 0 6px; }
h2 { font-size: 1.1rem; margin: 0 0 10px; }
.muted { color: var(--muted); }
.back { display: inline-block; margin-bottom: 8px; }

.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 18px 0; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 16px; display: flex; flex-direction: column; gap: 4px; }
.card-num { font-size: 1.9rem; font-weight: 700; }
.card-alert { border-color: var(--alarm); background: #fdecec; }
.card-warn { border-color: var(--warn); background: #fff5e6; }

table.grid { width: 100%; border-collapse: collapse; background: var(--panel);
  border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.grid th, .grid td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); }
.grid th { background: #eef2f4; font-weight: 600; font-size: .8rem; text-transform: uppercase;
  letter-spacing: .03em; color: var(--muted); }
.grid tr:last-child td { border-bottom: none; }
.sensors-cell { max-width: 320px; font-size: .85em; color: var(--muted); word-break: break-word; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 11px; font-size: .78rem; font-weight: 600; }
.badge-ok { background: #e3f4e8; color: var(--ok); }
.badge-late { background: #fff0d9; color: var(--warn); }
.badge-nodata { background: #eceff1; color: var(--muted); }
.badge-alarm { background: #fdecec; color: var(--alarm); }

.sev { padding: 2px 8px; border-radius: 6px; font-size: .78rem; font-weight: 600; text-transform: uppercase; }
.sev-info { background: #e7f0fb; color: #1565c0; }
.sev-warning { background: #fff0d9; color: var(--warn); }
.sev-critical { background: #fdecec; color: var(--crit); }
.row-critical td { background: #fffafa; }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 18px; margin: 16px 0; }
.panel label { margin-right: 16px; font-weight: 600; }
.panel select { margin-left: 6px; padding: 4px 8px; }

.tabs { display: flex; gap: 6px; margin: 14px 0; }
.tab { padding: 6px 14px; border-radius: 8px; background: #eef2f4; }
.tab-active { background: var(--brand); color: #fff; }

button { cursor: pointer; font: inherit; }
.btn-primary { width: 100%; padding: 10px; background: var(--brand); color: #fff;
  border: none; border-radius: 8px; font-weight: 600; }
.btn-primary:hover { background: var(--brand-d); }
.btn-small { padding: 5px 11px; background: var(--brand); color: #fff; border: none;
  border-radius: 7px; font-size: .82rem; }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; }
.flash-success { background: #e3f4e8; color: var(--ok); }
.flash-danger { background: #fdecec; color: var(--alarm); }
.flash-warning { background: #fff5e6; color: var(--warn); }
.flash-info { background: #e7f0fb; color: #1565c0; }

.login-wrap { display: flex; justify-content: center; padding-top: 8vh; }
.login-card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 30px; width: 340px; box-shadow: 0 6px 24px rgba(0,0,0,.06); }
.login-card h1 { color: var(--brand); }
.login-card .subtitle { color: var(--muted); margin-top: 0; }
.login-card label { display: block; margin: 14px 0 4px; font-weight: 600; }
.login-card input { width: 100%; padding: 9px; border: 1px solid var(--line); border-radius: 8px; }

@media (max-width: 760px) { .cards { grid-template-columns: repeat(2, 1fr); } }