* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 600px;
}

.card {
    background: #fff;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 15px 35px rgba(0,0,0,.15);
}

h1 {
    color: #222;
    margin-bottom: 8px;
}

.subtitle {
    color: #666;
    margin-bottom: 25px;
}

.form-group {
    margin-bottom: 18px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

input,
textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #dcdcdc;
    border-radius: 10px;
    font-size: 15px;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: #4f46e5;
}

button {
    width: 100%;
    padding: 14px;
    border: none;
    background: #4f46e5;
    color: white;
    font-size: 16px;
    border-radius: 10px;
    cursor: pointer;
    transition: .3s;
}

button:hover {
    background: #4338ca;
}

.result {
    margin-top: 25px;
}

.result pre {
    background: #f5f5f5;
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 13px;
}