body {
    font-family: sans-serif;
    margin: 0;
    padding: 15px;
    background-color: var(--tg-theme-bg-color, #f0f0f0);
    color: var(--tg-theme-text-color, #000000);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}
.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    background-color: var(--tg-theme-secondary-bg-color, #ffffff);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
h1 { text-align: center; margin-bottom: 20px; }
.form-group { margin-bottom: 15px; }
label { display: block; margin-bottom: 5px; font-weight: bold; }
input[type="text"] {
    width: calc(100% - 22px);
    padding: 10px;
    border: 1px solid var(--tg-theme-hint-color, #ccc);
    border-radius: 4px;
    box-sizing: border-box;
    background-color: var(--tg-theme-bg-color, #fff);
    color: var(--tg-theme-text-color, #000);
}
button {
    width: 100%;
    padding: 12px;
    background-color: var(--tg-theme-button-color, #007bff);
    color: var(--tg-theme-button-text-color, white);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}
button:hover { opacity: 0.9; }
#status { margin-top: 15px; text-align: center; font-size: 0.9em; }
#debug { margin-top: 10px; font-size: 0.8em; color: #777; word-break: break-all; }