* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 18px;
    background: var(--tg-theme-bg-color, #f3f4f6);
    color: var(--tg-theme-text-color, #111827);
    font-family: Arial, sans-serif;
}

main {
    max-width: 520px;
    margin: 0 auto;
}

h1 {
    margin-top: 0;
}

.card {
    margin-bottom: 14px;
    padding: 16px;
    background: var(--tg-theme-secondary-bg-color, #ffffff);
    border-radius: 14px;
}

input,
button {
    width: 100%;
    margin-top: 10px;
    padding: 12px;
    border-radius: 10px;
    font-size: 16px;
}

input {
    border: 1px solid #d1d5db;
}

button {
    border: 0;
    background: var(--tg-theme-button-color, #2481cc);
    color: var(--tg-theme-button-text-color, #ffffff);
    cursor: pointer;
}

pre {
    padding: 12px;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
    background: #111827;
    color: #e5e7eb;
    border-radius: 12px;
}