body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background: var(--tg-theme-bg-color, #ffffff);
    color: var(--tg-theme-text-color, #000000);
}

#app {
    max-width: 400px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    color: var(--tg-theme-text-color, #000000);
}

.content {
    margin-top: 20px;
}

.button {
    display: block;
    width: 100%;
    padding: 15px;
    margin: 10px 0;
    background: var(--tg-theme-button-color, #40a7e3);
    color: var(--tg-theme-button-text-color, #ffffff);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    text-align: center;
    box-sizing: border-box;
}

.button.secondary {
    background: transparent;
    color: var(--tg-theme-text-color, #000000);
    border: 1px solid var(--tg-theme-hint-color, #999999);
}

.loading {
    text-align: center;
    padding: 20px;
    color: var(--tg-theme-hint-color, #999999);
}

.hidden {
    display: none;
}

.card {
    background: var(--tg-theme-secondary-bg-color, #f0f0f0);
    border-radius: 8px;
    padding: 15px;
    margin: 10px 0;
}

.row {
    display: flex;
    justify-content: space-between;
    margin: 10px 0;
}

.back-button {
    margin-top: 20px;
}