:root{
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #1f2937;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --line: #334155;
  --primary: #2563eb;
  --success: #16a34a;
  --danger: #dc2626;
  --light: #475569;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}
a{color:inherit;text-decoration:none}
h1,h2,h3,p{margin:0}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--line);background:#0b1220;position:sticky;top:0;z-index:50}
.app-title{font-size:22px;font-weight:700}
.app-subtitle{font-size:12px;color:var(--muted);margin-top:4px}
.topbar-right{display:flex;align-items:center;gap:12px}
.user-chip{display:flex;flex-direction:column;padding:8px 12px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}
.user-chip span{font-size:12px;color:var(--muted)}
.page-shell{padding:18px}
.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-bottom:18px}
.stat-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:18px}
.stat-label{font-size:13px;color:var(--muted)}
.stat-value{font-size:28px;font-weight:700;margin-top:8px}
.monitor-layout{display:grid;grid-template-columns:2fr 1fr;gap:16px;margin-bottom:16px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;overflow:hidden}
.panel-main{min-height:540px}
.panel-side{max-height:540px;overflow:auto}
.panel-header{display:flex;justify-content:space-between;gap:14px;align-items:flex-start;padding:16px;border-bottom:1px solid var(--line);background:rgba(255,255,255,0.02)}
.panel-header h2,.panel-header h3{font-size:18px}
.panel-header p{font-size:13px;color:var(--muted);margin-top:4px}
.room-toolbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.room-toolbar select,.form-stack input{background:#0b1220;color:var(--text);border:1px solid var(--line);border-radius:10px;padding:10px 12px;min-width:170px}
.monitor-status{display:flex;flex-wrap:wrap;gap:8px;padding:12px 16px 0 16px}
.badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;padding:6px 10px;border-radius:999px;background:var(--panel-2);border:1px solid var(--line)}
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px;padding:16px}
.video-card{background:#0b1220;border:1px solid var(--line);border-radius:16px;overflow:hidden}
.video-card video{display:block;width:100%;height:200px;background:#000;object-fit:cover}
.video-meta{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:10px 12px}
.video-name{font-size:14px;font-weight:700}
.video-sub{font-size:12px;color:var(--muted)}
.room-list{display:flex;flex-direction:column}
.room-item{padding:14px 16px;border-bottom:1px solid var(--line)}
.room-name{font-weight:700}
.room-desc{color:var(--muted);font-size:13px;margin-top:4px}
.room-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;margin-top:8px}
.tables-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:10px 12px;border-bottom:1px solid var(--line);font-size:13px;text-align:left}
th{color:var(--muted);font-weight:600}
.btn{border:0;border-radius:10px;padding:10px 14px;color:#fff;cursor:pointer;font-weight:600}
.btn-primary{background:var(--primary)}
.btn-success{background:var(--success)}
.btn-danger{background:var(--danger)}
.btn-light{background:var(--light)}
.login-body{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.login-card{width:100%;max-width:420px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:24px}
.login-card h1{font-size:28px;margin-bottom:8px}
.login-card p{color:var(--muted);margin-bottom:20px}
.form-stack{display:flex;flex-direction:column;gap:12px}
.form-stack label{display:flex;flex-direction:column;gap:8px;font-size:14px}
.alert{padding:12px 14px;border-radius:12px;margin-bottom:14px}
.alert-danger{background:rgba(220,38,38,.15);border:1px solid rgba(220,38,38,.45);color:#fecaca}
.login-note{margin-top:16px;font-size:13px;color:var(--muted);line-height:1.6}
.empty-note{padding:24px;color:var(--muted);text-align:center}
@media (max-width:1100px){.stats-grid,.monitor-layout,.tables-grid{grid-template-columns:1fr}}