body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f6f9;
    color: #333;
}

.header {
    background: #fff;
    border-bottom: 1px solid #ddd;
}

.container {
    max-width: 1100px;
    margin: auto;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo, h2 {
    color: #000;
}

nav a {
    margin-left: 15px;
    text-decoration: none;
    color: #333;
}

.hero {
    text-align: center;
    padding: 60px 20px;
}

.btn-primary {
    background: #0066ff;
    color: #fff;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.btn-primary:hover {
    background: #004fd1;
}

.calculator {
    padding: 40px 20px;
    text-align: center;
}

.calc-box {
    background: #fff;
    max-width: 400px;
    margin: auto;
    padding: 25px;
    border-radius: 8px;
}

.calc-box input,
.calc-box select {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
}

.footer {
    text-align: center;
    padding: 15px;
    background: #fff;
    border-top: 1px solid #ddd;
}