.header {
    padding: 32px 24px;
    background: linear-gradient(135deg, var(--button-color), #5a9ce2);
    color: #ffffff;
    border-bottom-left-radius: var(--card-radius);
    border-bottom-right-radius: var(--card-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.header #greeting {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    color: inherit;
}

.header .subtitle {
    font-size: 14px;
    font-weight: 500;
    opacity: 0.9;
    margin-bottom: 4px;
}

.header .balance {
    font-size: 40px;
    font-weight: 800;
    letter-spacing: -1px;
}