body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #f0f4ff, #e0eaff);
    color: #333;
    overflow-x: hidden;
}

header {
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: 0 4px 20px rgba(0, 123, 255, 0.5);
    border-bottom: 4px solid #004085;
}

header h1 {
    margin: 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

nav {
    background: linear-gradient(135deg, #0056b3, #003d7a);
    padding: 0.75rem;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 86, 179, 0.3);
}

nav a {
    color: white;
    margin: 0 1.5rem;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease, text-shadow 0.3s ease;
}

nav a:hover {
    color: #ffd700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.7);
}

main {
    max-width: 900px;
    margin: 3rem auto;
    padding: 0 1.5rem;
}

.calculator {
    background: white;
    border-radius: 12px;
    padding: 2.5rem;
    margin-bottom: 3rem;
    box-shadow: 0 4px 20px rgba(0, 123, 255, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.calculator:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 25px rgba(0, 123, 255, 0.4);
}

form {
    display: grid;
    gap: 1.5rem;
}

label {
    font-weight: bold;
    color: #0056b3;
}

input, select, textarea {
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 6px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:focus, select:focus, textarea:focus {
    border-color: #007bff;
    box-shadow: 0 0 8px rgba(0, 123, 255, 0.3);
}

button {
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    padding: 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

button:hover {
    background: linear-gradient(135deg, #0056b3, #003d7a);
    box-shadow: 0 4px 15px rgba(0, 86, 179, 0.5);
}

#result {
    background: #d4edda;
    padding: 1.5rem;
    border-radius: 6px;
    margin-top: 1.5rem;
    display: none;
    box-shadow: 0 2px 10px rgba(0, 128, 0, 0.1);
}

footer {
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, #333, #222);
    color: white;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
}

@media (max-width: 600px) {
    main {
        padding: 0 1rem;
        max-width: 100%;
    }
    .calculator {
        padding: 1.5rem;
    }
    nav a {
        display: block;
        margin: 1rem 0;
    }
    header {
        padding: 1.5rem 1rem;
    }
}

.ad-container {
    text-align: center;
    margin: 1rem 0;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 123, 255, 0.2);
}
.header-ad {
    max-width: 728px;
    margin: 1rem auto;
}
@media (max-width: 600px) {
    .header-ad {
        max-width: 320px;
    }
}