body {
    font-family: system-ui;
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    position: relative;
}

.logo-top-right {
    position: absolute;
    top: -25px;
    right: 20px;
    max-width: 128px;
    width: 100%;
    height: auto;
    object-fit: contain;
    display: block;
}

.form-block {
    margin: 30px 0;
}

.form-block input {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    border-radius: 8px;
    border: 1px solid #ddd;
    font-size: 16px;
    box-sizing: border-box;
}

.tariff-card {
    border: 1px solid #ddd;
    border-radius: 12px;
    padding: 24px;
    margin: 12px 0;
}

.price {
    font-size: 32px;
    font-weight: bold;
}

.btn {
    background: #2563eb;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 12px;
}

.btn:hover {
    background: #1d4ed8;
}

.btn:disabled {
    background: #999;
    cursor: not-allowed;
}

.payment-box, .done-box {
    border: 1px solid #ddd;
    border-radius: 12px;
    padding: 30px;
    margin: 20px 0;
    text-align: center;
}

.payment-box .note, .done-box p {
    color: #666;
    font-size: 14px;
    margin: 10px 0;
    line-height: 1.5;
}

.sub-url {
    background: #f5f5f5;
    padding: 15px;
    border-radius: 8px;
    word-break: break-all;
    color: #2563eb;
    margin: 15px 0;
    font-size: 14px;
}

@media (max-width: 400px) {
    .logo-top-right {
        width: 36px;
        height: 36px;
        top: 8px;
        right: 8px;
    }
}