:root {
    --tg-theme-bg-color: #ffffff;
    --tg-theme-text-color: #000000;
    --tg-theme-hint-color: #999999;
    --tg-theme-link-color: #007aff;
    --tg-theme-button-color: #007aff;
    --tg-theme-button-text-color: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--tg-theme-bg-color);
    color: var(--tg-theme-text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

.container {
    width: 100%;
    max-width: 500px;
    text-align: center;
}

h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

p {
    color: var(--tg-theme-hint-color);
    margin-bottom: 20px;
}

#gift-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#profile-url {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--tg-theme-hint-color);
    border-radius: 8px;
    background-color: var(--tg-theme-bg-color);
    color: var(--tg-theme-text-color);
    font-size: 16px;
    box-sizing: border-box;
}

#profile-url::placeholder {
    color: var(--tg-theme-hint-color);
}

#submit-button {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 8px;
    background-color: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

#submit-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

#message-container {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    background-color: #f0f0f0;
    color: #333;
}

.hidden {
    display: none;
}