.b12co-root {
    max-width: 620px;
    margin: 24px auto;
    font-family: Arial, sans-serif;
}

.b12co-card {
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    padding: 20px;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.b12co-step h3 {
    margin-top: 0;
}

.b12co-desc,
.b12co-note {
    color: #4b5563;
    margin-bottom: 14px;
}

.b12co-card input {
    width: 100%;
    padding: 10px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    margin-bottom: 10px;
    box-sizing: border-box;
}

.b12co-card button {
    padding: 10px 16px;
    border: 0;
    border-radius: 6px;
    cursor: pointer;
    background: #1d4ed8;
    color: #fff;
}

.b12co-card button[disabled] {
    opacity: 0.7;
    cursor: not-allowed;
}

.b12co-small-link {
    margin-top: 16px;
    font-size: 12px;
    color: #6b7280;
}

.b12co-small-link a {
    color: #1d4ed8;
}

.b12co-message {
    margin-top: 10px;
    font-size: 14px;
}

.b12co-error {
    color: #b91c1c;
}

.b12co-success {
    color: #166534;
}

.b12co-hidden {
    display: none;
}