* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    background: #f0f2f5;
    color: #333;
    line-height: 1.6;
}

/* Header Styles */
header {
    background: #fff;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: center;
}

.logo {
    font-size: 2rem;
    color: #2c3e50;
    font-weight: bold;
}

/* Main Converter Section */
.converter-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.converter-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
}

select, input {
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

button {
    background: #3498db;
    color: #fff;
    border: none;
    padding: 1rem 2rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s;
}

button:hover {
    background: #2980b9;
}

.result {
    font-size: 1.5rem;
    font-weight: bold;
    text-align: center;
    padding: 1rem;
    color: #27ae60;
}

/* Categories Grid */
.categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.category-card {
    background: #fff;
    padding: 1rem;
    text-align: center;
    border-radius: 8px;
    transition: transform 0.3s;
}

/* Footer */
footer {
    background: #2c3e50;
    color: #fff;
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .converter-form {
        grid-template-columns: 1fr;
    }
}