* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: #10131c;
    color: white;
    font-family: Arial, sans-serif;
}

.app {
    max-width: 480px;
    margin: auto;
    padding: 25px 18px;
    text-align: center;
}

h1 {
    color: #f5c542;
    font-size: 32px;
    margin-bottom: 5px;
}

.subtitle {
    color: #9299aa;
    margin-bottom: 35px;
}

.balance-card,
.upgrade-card {
    background: #1c2230;
    border: 1px solid #30394c;
    border-radius: 20px;
    padding: 24px;
    margin-bottom: 22px;
}

.balance-card p {
    color: #aab1c0;
    font-size: 13px;
}

.balance {
    color: #f5c542;
    font-size: 30px;
    font-weight: bold;
    margin-top: 12px;
    overflow-wrap: anywhere;
}

button {
    border: none;
    border-radius: 14px;
    padding: 17px;
    font-size: 17px;
    font-weight: bold;
    cursor: pointer;
}

.earn-button {
    width: 100%;
    background: #f5c542;
    color: #171717;
    margin-bottom: 22px;
}

.upgrade-card button {
    width: 100%;
    background: #303c55;
    color: white;
    margin-top: 12px;
}

button:active {
    transform: scale(0.97);
}