:root {
    --bg-primary: #0f172a;
    --bg-surface: #1e293b;
    --bg-card: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-green: #34d399;
    --accent-violet: #8b5cf6;
    --accent-blue: #38bdf8;
    --severity-critical: #ef4444;
    --severity-high: #f97316;
    --severity-medium: #eab308;
    --severity-low: #22c55e;
    --severity-info: #94a3b8;
    --border: #475569;
    --radius: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Login page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2.5rem;
    width: 100%;
    max-width: 380px;
}

.login-header { text-align: center; margin-bottom: 2rem; }
.login-header h1 { color: var(--accent-green); font-size: 1.5rem; }
.login-header p { color: var(--text-secondary); font-size: 0.875rem; }

.form-group { margin-bottom: 1rem; }
.form-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}
.form-group input {
    width: 100%;
    padding: 0.625rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
}
.form-group input:focus {
    outline: none;
    border-color: var(--accent-violet);
}

.btn-primary {
    width: 100%;
    padding: 0.625rem;
    background: var(--accent-violet);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 0.5rem;
}
.btn-primary:hover { opacity: 0.9; }

.error { color: var(--severity-critical); font-size: 0.8rem; margin-top: 0.75rem; text-align: center; }

/* Dashboard layout */
.app-container { display: flex; min-height: 100vh; }

.sidebar {
    width: 220px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    padding: 1.5rem 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-brand {
    padding: 0 1.25rem;
    margin-bottom: 2rem;
}
.sidebar-brand h2 { font-size: 1.1rem; color: var(--accent-green); }
.sidebar-brand span { font-size: 0.75rem; color: var(--text-secondary); }

.sidebar-nav a {
    display: block;
    padding: 0.5rem 1.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    border-left: 3px solid transparent;
}
.sidebar-nav a:hover,
.sidebar-nav a.active {
    color: var(--text-primary);
    background: var(--bg-primary);
    border-left-color: var(--accent-violet);
}

.main-content {
    margin-left: 220px;
    padding: 2rem;
    flex: 1;
    width: calc(100% - 220px);
}

/* KPI cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.kpi-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
}
.kpi-card .label { font-size: 0.75rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.05em; }
.kpi-card .value { font-size: 1.75rem; font-weight: 700; margin-top: 0.25rem; }
.kpi-card .value.green { color: var(--accent-green); }
.kpi-card .value.violet { color: var(--accent-violet); }
.kpi-card .value.blue { color: var(--accent-blue); }

/* Charts */
.chart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.chart-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
}
.chart-card h3 { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 1rem; }

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}
.data-table th {
    text-align: left;
    padding: 0.625rem 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border);
}
.data-table td {
    padding: 0.625rem 0.75rem;
    border-bottom: 1px solid var(--border);
}
.data-table tr:hover td { background: var(--bg-card); }
.data-table tr { cursor: pointer; }

/* Severity badges */
.badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
}
.badge-critical { background: var(--severity-critical); color: white; }
.badge-high { background: var(--severity-high); color: white; }
.badge-medium { background: var(--severity-medium); color: #1e293b; }
.badge-low { background: var(--severity-low); color: white; }
.badge-info { background: var(--severity-info); color: var(--bg-primary); }

/* Filters */
.filters {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}
.filters select, .filters input {
    padding: 0.5rem 0.75rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.8125rem;
}

/* Detail page */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}
.detail-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
}
.detail-card h3 { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 0.75rem; }
.detail-row { display: flex; justify-content: space-between; padding: 0.375rem 0; font-size: 0.8125rem; }
.detail-row .key { color: var(--text-secondary); }

/* Responsive */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .main-content { margin-left: 0; width: 100%; padding: 1rem; }
    .kpi-grid { grid-template-columns: repeat(2, 1fr); }
    .chart-grid { grid-template-columns: 1fr; }
}