:root{
  --bg:#0f1216; --card:#181d24; --card2:#1f2630; --line:#2a323d;
  --txt:#e6ebf1; --muted:#8b97a6; --accent:#3ea6ff; --ok:#35c46a; --warn:#e5b545; --danger:#ef5b5b;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--txt);font:15px/1.45 -apple-system,Segoe UI,Roboto,Ubuntu,sans-serif}
a{color:inherit;text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:22px 18px 60px}
.muted{color:var(--muted)}
.ok{color:var(--ok)} .warn{color:var(--warn)}
code{background:#0d1015;padding:2px 6px;border-radius:5px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px}

.topbar{display:flex;align-items:center;gap:18px;padding:12px 20px;background:#12161c;border-bottom:1px solid var(--line)}
.brand{font-weight:700}
.topbar nav a{color:var(--muted);margin-right:14px}
.topbar nav a:hover{color:var(--txt)}
.spacer{flex:1}
.who{color:var(--muted);font-size:14px}

.btn,.btn-ghost,.btn-danger{border:0;border-radius:8px;padding:9px 16px;font:inherit;cursor:pointer}
.btn{background:var(--accent);color:#04121f;font-weight:600}
.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
.btn-danger{background:transparent;color:var(--danger);border:1px solid var(--danger)}
.btn:hover{filter:brightness(1.08)}

.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px}
.page-head{display:flex;justify-content:space-between;align-items:flex-end;margin:6px 0 18px}
h1{font-size:22px;margin:2px 0}
.back{font-size:13px}

.login-wrap{min-height:75vh;display:flex;align-items:center;justify-content:center}
.login{width:340px;display:flex;flex-direction:column;gap:12px;text-align:center}
.login h1{margin:0}
.login label{display:flex;flex-direction:column;gap:5px;text-align:left;font-size:13px;color:var(--muted)}
.login input,.row-form input{background:#0d1015;border:1px solid var(--line);border-radius:8px;padding:10px;color:var(--txt);font:inherit}
.alert{background:#3a1d1d;color:#ffb4b4;border:1px solid var(--danger);border-radius:8px;padding:8px}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.device{display:block;transition:.12s;border-left:3px solid var(--muted)}
.device:hover{transform:translateY(-2px);border-color:var(--accent)}
.device.on{border-left-color:var(--ok)}
.device.off{border-left-color:#4a5462;opacity:.85}
.device.revoked{border-left-color:var(--danger);opacity:.6}
.dev-head{display:flex;align-items:center;gap:8px;font-weight:600}
.dev-head .dot{width:8px;height:8px;border-radius:50%;background:#4a5462}
.device.on .dot{background:var(--ok);box-shadow:0 0 8px var(--ok)}
.dev-head .ver{margin-left:auto;font-size:11px;color:var(--muted);font-weight:400}
.dev-meta{font-size:12px;margin:6px 0 12px}
.dev-stats{display:flex;gap:16px}
.dev-stats .lbl{display:block;font-size:11px;color:var(--muted)}
.dev-stats b{font-size:18px}

.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:8px 0 18px;flex-wrap:wrap}
.tab{background:transparent;border:0;color:var(--muted);padding:10px 14px;cursor:pointer;font:inherit;border-bottom:2px solid transparent}
.tab.active{color:var(--txt);border-bottom-color:var(--accent)}
.tab-pane{display:none}
.tab-pane.active{display:block}

.metric{display:flex;flex-direction:column;gap:6px}
.metric .big{font-size:34px;font-weight:700}
.bar{height:10px;background:#0d1015;border-radius:6px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--accent);border-radius:6px}
.bar.warn>i{background:var(--warn)} .bar.hot>i{background:var(--danger)}

.tbl{width:100%;border-collapse:collapse;margin-top:14px}
.tbl th,.tbl td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);font-size:14px}
.tbl th{color:var(--muted);font-weight:500;font-size:12px}
.row-form{display:flex;gap:14px;align-items:flex-end;flex-wrap:wrap}
.row-form label{display:flex;flex-direction:column;gap:5px;font-size:12px;color:var(--muted)}
.copy{cursor:pointer}

.grp-head{display:flex;align-items:center;gap:10px;cursor:pointer;padding:10px 4px 8px;margin-top:8px;border-bottom:1px solid var(--line);user-select:none}
.grp-head:hover .grp-name{color:var(--accent)}
.grp-head .caret{color:var(--muted);width:12px}
.grp-name{font-weight:600}
.grp-count{font-size:12px;margin-left:auto}
.grid{margin:12px 0}
.dev-group{display:flex;align-items:center;gap:8px;margin-top:8px}
.dev-group select,.row-form select{background:#0d1015;border:1px solid var(--line);border-radius:8px;padding:8px;color:var(--txt);font:inherit}
.inline-rename{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.inline-rename input{background:#0d1015;border:1px solid var(--line);border-radius:6px;padding:6px 8px;color:var(--txt);font:inherit;max-width:220px}

.install-os{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px;margin-top:12px}
.install-os h3{margin:0 0 10px;font-size:15px}
.install-os pre{margin:0;background:#0d1015;border:1px solid var(--line);border-radius:8px;padding:12px;overflow-x:auto}
.install-os pre code{background:none;padding:0;font-size:12.5px;line-height:1.5;white-space:pre}

@media (max-width:560px){ .page-head{flex-direction:column;align-items:flex-start;gap:10px} }