:root{
  --blue:#2F86F6; --blue-d:#1565C0; --ink:#102A43; --muted:#627D98;
  --bg:#F4F7FB; --card:#FFFFFF; --line:#E2E9F2; --ok:#16A34A; --off:#9AA7B5; --warn:#DC2626;
}
*{box-sizing:border-box}
body{margin:0;font-family:'Segoe UI',system-ui,sans-serif;background:var(--bg);color:var(--ink)}
.hidden{display:none!important}
.muted{color:var(--muted)}
.err{color:var(--warn);font-size:13px;min-height:18px;margin:4px 0}

/* LOGIN */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#2F86F6,#1248A8)}
.login-card{background:#fff;border-radius:18px;box-shadow:0 20px 60px rgba(16,42,73,.3);
  width:380px;padding:34px 30px}
.login-brand{text-align:center;margin-bottom:22px}
.logo{width:60px;height:60px;border-radius:16px;background:linear-gradient(135deg,#2F86F6,#1565C0);
  color:#fff;font-weight:800;font-size:34px;display:flex;align-items:center;justify-content:center;margin:0 auto}
.logo.sm{width:32px;height:32px;font-size:18px;border-radius:9px;display:inline-flex;vertical-align:middle}
.login-brand h1{margin:14px 0 2px;font-size:26px}
.login-brand p{margin:0;color:var(--muted);font-size:14px}
.login-form label{display:block;font-weight:600;font-size:13px;color:#334E68;margin:14px 0 6px}
.login-form input{width:100%;height:44px;border:1.4px solid var(--line);border-radius:10px;
  padding:0 12px;font-size:14px;background:#F7F9FC}
.pwd{position:relative}
.pwd .eye{position:absolute;right:6px;top:6px;height:32px;width:34px;border:0;background:transparent;
  cursor:pointer;font-size:16px;opacity:.6}
.btn-primary{margin-top:18px;width:100%;height:46px;border:0;border-radius:10px;color:#fff;font-size:15px;
  font-weight:600;cursor:pointer;background:linear-gradient(135deg,#2F86F6,#1565C0)}
.btn-primary:hover{opacity:.93}

/* APP */
.topbar{display:flex;align-items:center;justify-content:space-between;background:#fff;
  padding:12px 22px;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.brand{font-weight:700;font-size:18px}
.top-right{display:flex;align-items:center;gap:12px}
.btn-ghost{border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px 12px;
  cursor:pointer;font-weight:600;color:#334E68}
.btn-ghost:hover{background:#F2F6FC}
.content{max-width:1200px;margin:0 auto;padding:22px}
.cards{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;margin-bottom:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.card .v{font-size:28px;font-weight:800}
.card .k{color:var(--muted);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.3px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:18px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px}
.panel h2{margin:0 0 12px;font-size:16px}
.table-wrap{overflow:auto;max-height:340px}
table{width:100%;border-collapse:collapse;font-size:13.5px}
th{text-align:left;color:var(--muted);font-weight:600;padding:8px 10px;border-bottom:2px solid var(--line);
  position:sticky;top:0;background:#fff}
td{padding:9px 10px;border-bottom:1px solid var(--line)}
.pill{display:inline-block;padding:3px 9px;border-radius:20px;font-size:12px;font-weight:700}
.pill.on{background:#E7F6EC;color:var(--ok)}
.pill.off{background:#EEF1F4;color:var(--off)}
.tank{margin-bottom:14px}
.tank .lbl{display:flex;justify-content:space-between;font-size:13px;margin-bottom:5px}
.bar{height:14px;background:#EEF2F7;border-radius:8px;overflow:hidden}
.bar > i{display:block;height:100%;background:linear-gradient(90deg,#2F86F6,#1565C0)}
.foot{text-align:center;padding:20px;font-size:12px}
@media(max-width:900px){.cards{grid-template-columns:repeat(2,1fr)}.grid2{grid-template-columns:1fr}}