/* Base layout */
html, body {
    margin: 0;
    padding: 0;
    font-family: Lato, sans-serif;
    background: #ffffff;
    color: #333333;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px;
}

/* Typography */
h1 {
    color: #0043BE; /* Clausewell Blue */
    margin: 0 0 16px 0;
}

h2 {
    margin: 40px 0 16px 0;
    color: #0043BE;
    font-size: 1.25rem;
}

/* Iframe */
#signFrame {
    width: 100%;
    height: 560px;
    border: none;
    border-radius: 8px;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.12);
}

/* Payment */
.btn-primary {
    background: #0043BE;
    color: #ffffff;
    padding: 14px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: default;
}

.success-banner {
    background: #E8EEFC; /* Lightest blue */
    padding: 16px;
    border-radius: 8px;
    color: #0043BE;
    margin-top: 24px;
    font-weight: 700;
    text-align: center;
}