* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f6f8;
    color: #1f2937;
}

.container {
    max-width: 760px;
    margin: 60px auto;
    padding: 24px;
}

h1 {
    margin-bottom: 12px;
}

.card {
    display: flex;
    gap: 12px;
    margin: 24px 0;
}

input {
    flex: 1;
    padding: 12px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
}

button {
    padding: 12px 16px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
}

pre {
    padding: 16px;
    background: white;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    overflow: auto;
}