:root {
    --primary-color: #0b5ed7;
    --secondary-color: #6c757d;
    --bg-color: #f4f6f9;
}

body {
    background-color: var(--bg-color);
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.login-container {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border: none;
    border-radius: 12px;
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid #f0f0f0;
    font-weight: 600;
}

/* Sidebar para el Layout si es necesario, o navbar superior */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.stat-card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 15px rgba(0,123,255,0.2);
}

.table th {
    font-weight: 600;
    color: #495057;
}

.btn-modern {
    border-radius: 8px;
    font-weight: 500;
}