:root{
  --bg:#f2f6fb; --card:#ffffff; --ink:#1b2b3f; --muted:#6b7d94;
  --accent:#2f7bf6; --ok:#16a34a; --warn:#f59e0b; --danger:#ef4444;
  --off:#94a3b8; --ring:#e6edf5; --shadow:0 6px 20px rgba(31,58,95,.08);
  --r:16px;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--ink);}

/* top */
.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  padding:14px 22px;background:linear-gradient(120deg,#0f2c5c,#2b6ee6);color:#fff;}
.brand{display:flex;gap:12px;align-items:center}
.logo{font-size:34px;line-height:1}
.brand h1{margin:0;font-size:20px;letter-spacing:.5px}
.sub{font-size:12px;opacity:.85}
.top-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.devsel{font-size:12px;opacity:.9;display:flex;align-items:center;gap:6px}
.devsel select{background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.25);color:#fff;
  border-radius:8px;padding:5px 8px;font-size:13px}
.lastupd{font-size:12px;opacity:.85}
.badge{font-size:12px;font-weight:700;padding:5px 12px;border-radius:999px;letter-spacing:.4px}
.badge.off{background:var(--off)}
.badge.on{background:var(--ok)}
.badge.dang{background:var(--danger);animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.55}}

/* alert */
.alert{display:flex;gap:12px;align-items:center;margin:16px 22px 0;padding:14px 18px;
  background:#fee2e2;border:2px solid var(--danger);border-radius:var(--r);color:#7f1d1d;
  font-size:15px}
.alert .alert-ico{font-size:26px}
.hidden{display:none !important}

/* cards */
main.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;padding:20px 22px}
h2{font-size:16px;margin:0}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;
  text-align:center;display:flex;flex-direction:column;gap:8px}
.card-h{font-weight:600;font-size:13px;color:var(--muted);display:flex;align-items:center;justify-content:center;gap:7px}
.ci{font-size:18px}
.gauge{--p:0%;--c:var(--accent);width:104px;height:104px;margin:6px auto 0;border-radius:50%;
  background:conic-gradient(var(--c) var(--p), var(--ring) 0);display:grid;place-items:center;
  position:relative}
.gauge::before{content:"";position:absolute;inset:10px;border-radius:50%;background:#fff}
.val-row{position:relative;margin-top:-88px;z-index:1;display:flex;align-items:baseline;justify-content:center;gap:4px}
.big{font-size:34px;font-weight:800;line-height:1}
.unit{font-size:14px;color:var(--muted)}
.big-row{margin-top:10px}
.hint{font-size:11px;color:var(--muted);margin:0}
.bar{height:12px;border-radius:999px;background:var(--ring);overflow:hidden;margin-top:4px}
.bar-fill{height:100%;width:0%;background:linear-gradient(90deg,#22c55e,#f59e0b,#ef4444);transition:width .5s}
.pill-big{font-size:24px;font-weight:800;padding:16px;border-radius:12px;background:var(--ring);color:var(--muted)}
.pill-big.yes{background:var(--danger);color:#fff}
.pill-big.no{background:#dcfce7;color:var(--ok)}
.pill-big.gaga{background:#fef3c7;color:var(--warn)}
.status-card .pill-big{padding:26px}

/* panel */
.panel{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);margin:4px 22px 20px;padding:20px}
.panel-h{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;margin-bottom:14px}
.ranges{display:flex;gap:6px}
.rg{border:1px solid var(--ring);background:#fff;border-radius:8px;padding:5px 12px;cursor:pointer;
  font-size:12px;color:var(--muted)}
.rg.active{background:var(--accent);color:#fff;border-color:var(--accent)}
#chart{max-height:300px}
.foot{text-align:center;color:var(--muted);font-size:12px;padding:6px 0 26px}