body {
    margin: 0;
    font-family: sans-serif;
    background: #f5f5f5;
}

.container-center {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.card {
    background: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    text-align: center;
    max-width: 800px;
    margin: 40px auto;
}

.btn-black {
    padding: 15px 30px;
    background: #000;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

.header {
    background: #fff;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.profile-widget {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.balance-title {
    color: #888;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.balance-amount {
    font-size: 64px;
    font-weight: bold;
    color: #333;
    margin: 10px 0;
}