body {
    background-color: #f0f2f5;
}
.hero {
    text-align: center;
    padding: 50px 20px;
    background: linear-gradient(135deg, #007bff, #00d4ff);
    color: white;
    border-radius: 10px;
    margin: 50px auto;
    max-width: 800px;
}
.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}
.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}
.btn-login {
    font-size: 1.1rem;
    padding: 10px 30px;
}
.login-container, .admin-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
.error, .success {
    padding: 10px;
    border-radius: 5px;
    display: none;
    text-align: center;
}
.error {
    color: #721c24;
    background-color: #f8d7da;
}
.success {
    color: #155724;
    background-color: #d4edda;
}
.calculator-container {
    max-width: 1200px;
    margin: 20px auto;
}
.vertical-divider {
    border-right: 2px solid #007bff;
    height: 38px;
    margin: 0 15px;
}
.form-control {
    width: 90px;
    font-size: 0.9rem;
}
.col-form-label {
    font-size: 0.9rem;
}
.row {
    flex-wrap: nowrap;
    margin-bottom: 10px;
    padding: 8px 0;
    background-color: #f8f9fa;
    border-radius: 5px;
}
#errorMessage {
    display: none;
    margin-top: 20px;
    padding: 15px;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 5px;
    color: #721c24;
}
@media (max-width: 768px) {
    .row {
        flex-wrap: wrap;
    }
    .vertical-divider {
        display: none;
    }
}