:root{
  --bg:#f4f6f8; --card:#fff; --border:#e2e5e9; --text:#2b2f36; --muted:#767c86;
  --green:#4CAF50; --green-dark:#3d8b40; --gray:#9aa0a8; --red:#e74c3c; --orange:#e67e22;
  --blue:#3f7cd6; --radius:10px;
}
*{box-sizing:border-box;}
body{
  margin:0; background:var(--bg); color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
}
a{color:var(--blue); text-decoration:none;}
a:hover{text-decoration:underline;}

.topbar{
  display:flex; align-items:center; justify-content:space-between;
  background:var(--card); border-bottom:1px solid var(--border);
  padding:12px 24px;
}
.topbar .brand{font-weight:700; font-size:16px;}
.topbar nav{display:flex; gap:18px; align-items:center; font-size:14px;}
.topbar nav a.active{font-weight:600; color:var(--text);}
.topbar .who{color:var(--muted); font-size:13px; margin-left:12px;}

.container{max-width:1100px; margin:0 auto; padding:24px;}
.narrow{max-width:480px;}

h1{font-size:22px; margin:0 0 18px;}
h2{font-size:17px; margin:24px 0 12px;}

.card{
  background:var(--card); border:1px solid var(--border); border-radius:var(--radius);
  padding:18px; box-shadow:0 1px 3px rgba(0,0,0,.04);
}

.grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(240px,1fr)); gap:18px;}

.btn{
  display:inline-block; padding:8px 16px; border-radius:8px; border:1px solid var(--border);
  background:#fff; color:var(--text); font-size:14px; cursor:pointer;
}
.btn-primary{background:var(--green); border-color:var(--green-dark); color:#fff;}
.btn-primary:hover{background:var(--green-dark);}
.btn-danger{color:var(--red); border-color:#f3c9c4;}
.btn:disabled{opacity:.55; cursor:not-allowed;}

.field{margin-bottom:14px;}
.field label{display:block; font-size:13px; color:var(--muted); margin-bottom:4px;}
.field input[type=text], .field input[type=password], .field input[type=number], .field select{
  width:100%; padding:8px 10px; border:1px solid var(--border); border-radius:8px; font-size:14px;
}

table{width:100%; border-collapse:collapse; font-size:14px;}
table th{text-align:left; color:var(--muted); font-weight:600; padding:8px 10px; border-bottom:2px solid var(--border);}
table td{padding:8px 10px; border-bottom:1px solid var(--border);}

.pill{display:inline-block; padding:2px 9px; border-radius:20px; font-size:12px; font-weight:600;}
.pill-on{background:#e8f5e9; color:#2e7d32;}
.pill-off{background:#f1f2f4; color:#767c86;}
.pill-warn{background:#fff3e0; color:#e65100;}
.pill-bad{background:#fdecea; color:#c0392b;}

.dial{
  width:76px; height:76px; border-radius:50%; border:5px solid #eee; background:var(--gray);
  color:#fff; font-weight:700; font-size:13px; cursor:pointer; margin:0 auto 10px; display:block;
  transition:all .25s ease;
}
.dial:hover{transform:scale(1.05);}
.dial.state-on{background:var(--green); border-color:var(--green-dark); box-shadow:0 0 18px rgba(76,175,80,.45);}
.dial.state-off{background:var(--gray); border-color:#888;}

.device-card{text-align:center;}
.device-card h3{margin:0 0 12px; font-size:15px;}
.device-info{margin-top:10px; padding:8px 10px; background:#f7f9f7; border-radius:6px; font-size:12px; color:#555; text-align:left; display:none; border-left:3px solid var(--green);}
.device-sessions{margin-top:10px; padding:8px 10px; background:#f5f5f5; border-radius:6px; font-size:11px; color:#666; text-align:left; display:none;}
.limit-bar{height:4px; background:#eee; border-radius:2px; margin:3px 0; overflow:hidden;}
.limit-bar-fill{height:100%; border-radius:2px;}
.limit-bar-fill.ok{background:var(--green);}
.limit-bar-fill.warning{background:#ff9800;}
.limit-bar-fill.exceeded{background:var(--red);}

.notice{padding:12px 14px; border-radius:8px; margin:14px 0; font-size:14px;}
.notice-info{background:#eef4fc; color:#2a5c9a;}
.notice-warn{background:#fff8e6; color:#8a6100;}
.notice-error{background:#fdecea; color:#c0392b;}
.notice-success{background:#e9f7ec; color:#256a30;}

.login-wrap{min-height:100vh; display:flex; align-items:center; justify-content:center;}
.muted{color:var(--muted);}
.right{text-align:right;}
.center{text-align:center;}
.flex{display:flex; gap:10px; align-items:center;}
.flex-between{display:flex; justify-content:space-between; align-items:center;}