body {
    font-family: Arial, sans-serif;
    background: #f0f2f5;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}
.container {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 400px;
}
input[type="url"] {
    width: 100%;
    padding: 10px;
    margin: 15px 0;
    border-radius: 8px;
    border: 1px solid #ccc;
}
button {
    background: #1877f2;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}
button:hover {
    background: #145db2;
}
.thumbnail {
    max-width: 100%;
    border-radius: 10px;
    margin: 20px 0;
}
.download a {
    display: inline-block;
    background: #42b72a;
    color: #fff;
    padding: 10px 15px;
    border-radius: 8px;
    text-decoration: none;
}
.download a:hover {
    background: #369f22;
}
.back {
    display: block;
    margin-top: 15px;
    color: #1877f2;
    text-decoration: none;
}
.back:hover {
    text-decoration: underline;
}