html,
body {
    height: 100%;
    margin: 0;
    background: #0f172a;
    font-family: Arial, sans-serif;
}

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

.card {
    padding: 60px 80px;
    border-radius: 16px;
    background: #ffffff;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    min-width: 420px;
}

.code {
    font-size: 110px;
    font-weight: bold;
    color: #e74c3c;
    margin: 0;
    line-height: 1;
}

.title {
    font-size: 28px;
    margin-top: 10px;
    color: #333;
}

.desc {
    margin-top: 15px;
    color: #666;
    font-size: 16px;
}

.hint {
    margin-top: 25px;
    font-size: 13px;
    color: #999;
}