body.checkout-body {
    margin: 0;
    padding: 0;
    background-color: #0f172a;
    color: #f8fafc;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.checkout-container {
    background-color: #1e293b;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 2.5rem;
    max-width: 420px;
    width: 90%;
    text-align: center;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.checkout-container h2 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1.75rem;
    font-weight: 700;
    color: #ffffff;
}

.checkout-subtext {
    color: #94a3b8;
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.price-tag {
    font-size: 2.5rem;
    font-weight: 800;
    color: #38bdf8;
    margin-bottom: 1.5rem;
}

.btn-pay {
    width: 100%;
    background-color: #2563eb;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out, transform 0.1s ease-in-out;
}

.btn-pay:hover {
    background-color: #1d4ed8;
}

.btn-pay:disabled {
    background-color: #64748b;
    cursor: not-allowed;
}

.loader {
    display: none;
    margin: 1rem auto 0;
    border: 3px solid #334155;
    border-top: 3px solid #38bdf8;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.secure-badge {
    margin-top: 1.5rem;
    font-size: 0.8rem;
    color: #64748b;
}