:root {
    --primary: #1e3a8a;
    --secondary: #0284c7;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #1f2937;
    --light: #f3f4f6;
    --white: #ffffff;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', sans-serif; }
body { background-color: var(--light); color: var(--dark); }

.login-container { max-width: 420px; margin: 80px auto; background: var(--white); padding: 30px; border-radius: 12px; box-shadow: 0 10px 25px rgba(0,0,0,0.1); }
.brand-header { text-align: center; margin-bottom: 25px; }
.brand-header h2 { color: var(--primary); font-weight: 700; }

.dashboard-wrapper { display: flex; min-height: 100vh; }
.sidebar { width: 260px; background: var(--primary); color: var(--white); padding: 20px; }
.sidebar h3 { margin-bottom: 20px; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 10px; }
.sidebar .nav-link { display: block; color: #cbd5e1; padding: 12px 15px; text-decoration: none; border-radius: 6px; margin-bottom: 8px; transition: 0.3s; }
.sidebar .nav-link:hover, .sidebar .nav-link.active { background: var(--secondary); color: var(--white); }

.main-content { flex: 1; padding: 30px; }
.metrics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin-bottom: 30px; }
.card { background: var(--white); padding: 20px; border-radius: 10px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); border-left: 5px solid var(--secondary); }
.card.success { border-left-color: var(--success); }
.card.danger { border-left-color: var(--danger); }
.card.warning { border-left-color: var(--warning); }
.card-title { font-size: 14px; color: #6b7280; text-transform: uppercase; }
.card-value { font-size: 24px; font-weight: bold; margin-top: 5px; }

.table-responsive { background: var(--white); padding: 20px; border-radius: 10px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); margin-bottom: 30px; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: 12px 15px; border-bottom: 1px solid #e5e7eb; }
th { background: #f9fafb; color: var(--dark); }

.form-control { width: 100%; padding: 10px; margin-bottom: 15px; border: 1px solid #d1d5db; border-radius: 6px; }
.btn { padding: 10px 20px; border: none; border-radius: 6px; cursor: pointer; font-weight: 600; display: inline-block; text-decoration: none; text-align: center; }
.btn-primary { background: var(--primary); color: var(--white); }
.btn-success { background: var(--success); color: var(--white); }
.btn-danger { background: var(--danger); color: var(--white); }

@media (max-width: 768px) { .dashboard-wrapper { flex-direction: column; } .sidebar { width: 100%; } }