:root{
  --teal:#1f6f78; --teal2:#2e8b96; --green:#2e7d32; --green-soft:#e7f4e8;
  --red:#c62828; --orange:#e08a1e; --ink:#173b42; --line:#d8e2e4; --bg:#eef3f4;
}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI",Arial,sans-serif;background:var(--bg);color:#1f2d30}
button{font-family:inherit;cursor:pointer}
input,select{font-family:inherit;padding:8px;border:1px solid var(--line);border-radius:6px;width:100%}
.hidden{display:none!important}

/* ---------- login ---------- */
#login{min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#1f6f78,#173b42)}
.login-card{background:#fff;padding:32px;border-radius:12px;width:340px;box-shadow:0 12px 40px rgba(0,0,0,.3)}
.login-card h1{font-size:18px;color:var(--teal);margin:0 0 4px;text-align:center}
.login-card p{margin:0 0 20px;text-align:center;color:#789;font-size:12px}
.login-card label{font-size:12px;color:#567;display:block;margin:10px 0 4px}
.login-card button{width:100%;margin-top:18px;background:var(--teal);color:#fff;border:0;padding:11px;border-radius:6px;font-weight:bold}
.err{color:var(--red);font-size:12px;margin-top:10px;text-align:center;min-height:16px}

/* ---------- layout ---------- */
#app{display:flex;min-height:100vh}
.sidebar{width:220px;background:#12343b;color:#cfe3e6;flex-shrink:0;display:flex;flex-direction:column}
.sidebar .brand{padding:18px 16px;border-bottom:1px solid rgba(255,255,255,.1)}
.sidebar .brand b{color:#fff;letter-spacing:2px}
.sidebar .brand span{display:block;font-size:10px;letter-spacing:4px;color:#8fb7bd}
.sidebar nav{padding:10px 0;flex:1}
.sidebar a{display:block;padding:12px 18px;color:#cfe3e6;text-decoration:none;font-size:14px;border-left:3px solid transparent}
.sidebar a:hover{background:rgba(255,255,255,.06)}
.sidebar a.active{background:rgba(46,139,150,.25);border-left-color:#5fd0dc;color:#fff}
.sidebar .foot{padding:12px 18px;font-size:11px;color:#7fa6ac;border-top:1px solid rgba(255,255,255,.1)}

.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{background:linear-gradient(90deg,var(--teal),var(--teal2));color:#fff;padding:10px 18px;
  display:flex;align-items:center;justify-content:space-between}
.topbar h2{margin:0;font-size:16px;font-weight:700;text-align:center;flex:1}
.topbar .who{font-size:12px;display:flex;gap:12px;align-items:center}
.subbar{background:#3c9aa6;color:#fff;text-align:center;padding:6px;font-weight:600;font-size:14px}
.content{padding:16px;flex:1;overflow:auto}

/* ---------- dashboard ---------- */
.updated{background:#dbe9ea;text-align:center;font-size:12px;padding:4px;border-radius:6px;margin-bottom:12px;color:#456}
.grid{display:grid;grid-template-columns:2fr 1fr;gap:14px;align-items:start}
.cards{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.card{background:var(--green);color:#fff;border-radius:10px;padding:16px;text-align:center;box-shadow:0 2px 6px rgba(0,0,0,.12)}
.card.warn{background:var(--orange)} .card.crit{background:var(--red)}
.card .lbl{font-size:12px;letter-spacing:1px;opacity:.9}
.card .big{font-size:30px;font-weight:800;margin:6px 0}
.card .sub{font-size:11px;opacity:.85}
.panel{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px;margin-bottom:14px}
.panel h3{margin:0 0 10px;font-size:14px;color:var(--ink);text-align:center}
.alert-box{border-radius:8px;padding:10px 12px;margin-bottom:8px;color:#fff;font-size:13px;line-height:1.3}
.alert-box.crit{background:var(--red)} .alert-box.alerta{background:var(--orange)}
.alert-box .t{font-weight:800}
.alert-empty{color:#3a7;background:#eaf7ee;border-radius:8px;padding:10px;text-align:center;font-size:13px}
.footbar{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.footbar .pill{flex:1;min-width:180px;background:#12343b;color:#fff;border-radius:8px;padding:8px 12px;font-size:13px;text-align:center}
.footbar .pill b{color:#ffd54f}
.footbar .pill .on{color:#7CFC9A} .footbar .pill .off{color:#ff8a80}

/* tanque svg */
.tank-wrap{text-align:center}
.tank-num{font-size:13px;margin-top:6px;color:var(--ink)}

/* tabelas */
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{border-bottom:1px solid var(--line);padding:8px;text-align:left}
th{background:#f2f7f8;color:#456}
.btn{background:var(--teal);color:#fff;border:0;padding:8px 14px;border-radius:6px}
.btn.sec{background:#eef3f4;color:#456;border:1px solid var(--line)}
.btn.danger{background:var(--red)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:end;margin-bottom:12px}
.row>div{flex:1;min-width:150px}
label.f{font-size:12px;color:#567;display:block;margin-bottom:4px}
.badge{padding:2px 8px;border-radius:10px;font-size:11px;color:#fff}
.badge.admin{background:#7b1fa2}.badge.operator{background:#1565c0}.badge.viewer{background:#546e7a}
.toast{position:fixed;bottom:20px;right:20px;background:#12343b;color:#fff;padding:12px 18px;border-radius:8px;font-size:13px;box-shadow:0 6px 20px rgba(0,0,0,.3);opacity:0;transition:.3s}
.toast.show{opacity:1}
@media(max-width:900px){.grid{grid-template-columns:1fr}.cards{grid-template-columns:1fr}}