body {
    font-family: 'Vazirmatn', sans-serif;
    background: #f4f4f4;
    color: #333;
    margin: 0;
    padding: 0;
}

header {
    background: #0077cc;
    color: white;
    text-align: center;
    padding: 1rem 0;
}

h1 {
    margin: 0;
}

main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.tool {
    background: white;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.tool h2 {
    margin-top: 0;
}

input[type="text"],
input[type="number"] {
    width: calc(100% - 120px);
    padding: 0.5rem;
    margin-right: 0.5rem;
}

button {
    padding: 0.5rem 1rem;
    background: #0077cc;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background: #005fa3;
}

pre {
    background: #eee;
    padding: 0.5rem;
    border-radius: 4px;
    overflow-x: auto;
    margin-top: 0.5rem;
}