:root {
    --bg-dark: #0f172a; --bg-card: #1e293b; --bg-card-hover: #334155;
    --text-main: #f8fafc; --text-muted: #94a3b8;
    --accent: #3b82f6; --danger: #ef4444; --warning: #f59e0b; --success: #10b981;
    --border: #334155;
}
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', system-ui, sans-serif; }
body { background-color: var(--bg-dark); color: var(--text-main); display: flex; height: 100vh; overflow: hidden; }

.sidebar { width: 250px; background-color: var(--bg-card); border-right: 1px solid var(--border); padding: 20px; }
.logo { font-size: 1.4rem; font-weight: bold; color: var(--accent); margin-bottom: 30px; display: flex; align-items: center; gap: 10px; }
.nav-item { padding: 12px; margin-bottom: 8px; border-radius: 6px; color: var(--text-muted); cursor: pointer; text-decoration: none; display: block; }
.nav-item:hover { background-color: var(--bg-card-hover); }
.nav-item.active { background-color: var(--accent); color: white; }

.main { flex: 1; padding: 25px; overflow-y: auto; }
.header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; border-bottom: 1px solid var(--border); padding-bottom: 15px; }

/* Grids & Cards */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 25px; }
.stat-card { background: var(--bg-card); padding: 20px; border-radius: 10px; border: 1px solid var(--border); border-left: 4px solid var(--accent); }
.stat-title { font-size: 0.85rem; color: var(--text-muted); text-transform: uppercase; margin-bottom: 10px; }
.stat-val { font-size: 2rem; font-weight: bold; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 25px; }

/* Panels & Tables */
.panel { background: var(--bg-card); padding: 20px; border-radius: 10px; border: 1px solid var(--border); margin-bottom: 25px; }
.panel-title { margin-bottom: 15px; color: var(--text-main); font-size: 1.1rem; border-bottom: 1px solid var(--border); padding-bottom: 10px;}

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { padding: 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; }
tr:hover { background-color: var(--bg-card-hover); }

.badge { padding: 4px 8px; border-radius: 4px; font-size: 0.75rem; font-weight: bold; }
.badge.critical { background: rgba(239,68,68,0.2); color: var(--danger); border: 1px solid var(--danger); }
.badge.high { background: rgba(245,158,11,0.2); color: var(--warning); border: 1px solid var(--warning); }
.badge.normal { background: rgba(59,130,246,0.2); color: var(--accent); border: 1px solid var(--accent); }

.btn { padding: 8px 12px; background: var(--border); color: white; border: none; border-radius: 5px; cursor: pointer; font-size: 0.8rem; }
.btn-action { background: var(--accent); }
.btn-danger { background: var(--danger); }
.btn:hover { opacity: 0.9; }