body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
}

.hero-section, .login-section, .report-section {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.company-logo {
    max-width: 200px;
    height: auto;
}

.login-image {
    max-width: 250px;
    height: auto;
    animation: fadeIn 1s ease-in-out;
}

.card {
    border: none;
    border-radius: 10px;
    background: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-primary, .btn-success, .btn-danger {
    border: none;
    padding: 12px 30px;
    font-size: 1.2rem;
    transition: background-color 0.3s, transform 0.2s;
}

.btn-primary {
    background-color: #007bff;
}

.btn-primary:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

.btn-success {
    background-color: #28a745;
}

.btn-success:hover {
    background-color: #218838;
    transform: translateY(-2px);
}

.btn-danger {
    background-color: #dc3545;
}

.btn-danger:hover {
    background-color: #c82333;
    transform: translateY(-2px);
}

.welcome-message, .login-section .card, .report-section .card {
    max-width: 800px;
    width: 100%;
    text-align: center;
}

.display-4 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a3c6d;
}

.lead {
    font-size: 1.2rem;
    color: #6c757d;
}

.form-label {
    font-weight: 500;
    color: #1a3c6d;
    margin-bottom: 0.5rem;
}

.form-control {
    border-radius: 5px;
    padding: 10px;
    font-size: 1rem;
}

.form-control:focus {
    border-color: #007bff;
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.3);
}

.text-danger {
    font-size: 0.875rem;
}

.table {
    background-color: white;
    border-radius: 5px;
    overflow: hidden;
}

.table th {
    background-color: #f8f9fa;
    color: #1a3c6d;
}

@keyframes fadeIn {
    0% { opacity: 0; transform: scale(0.9); }
    100% { opacity: 1; transform: scale(1); }
}

@media (max-width: 768px) {
    .company-logo {
        max-width: 150px;
    }
    .login-image {
        max-width: 200px;
    }
    .display-4 {
        font-size: 2rem;
    }
    .card {
        padding: 1.5rem;
    }
    .report-section .card {
        max-width: 100%;
    }
}