body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.sidebar {
    background: rgba(0, 0, 0, 0.8);
    min-height: 100vh;
    backdrop-filter: blur(10px);
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.main-content {
    background: rgba(255, 255, 255, 0.95);
    min-height: 100vh;
    backdrop-filter: blur(10px);
}

.invoice-preview {
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    margin: 1rem 0;
}

.card {
    border-radius: 10px !important;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15) !important;
}

.card-header {
    border-radius: 10px 10px 0 0 !important;
    font-weight: 600;
}

.btn-light:hover {
    background: #f8f9fa;
    border-color: #e9ecef;
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.table {
    font-size: 0.9rem;
}

.table th {
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.display-1 {
    font-size: 4rem;
    opacity: 0.3;
}

/* Responsividad */
@media (max-width: 768px) {
    .invoice-preview {
        padding: 1rem;
        margin: 0.5rem;
        border-radius: 10px;
    }
    
    .sidebar {
        min-height: auto;
    }
    
    .main-content {
        min-height: auto;
    }
}

/* Efectos de hover y transiciones */
.form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.table-responsive {
    border-radius: 0 0 10px 10px;
}

/* Animaciones suaves */
.card, .btn, .form-select {
    transition: all 0.2s ease;
}

.sidebar .text-light {
    color: rgba(255, 255, 255, 0.8) !important;
}

.sidebar .text-white {
    color: white !important;
}