body {
    position: relative;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #222;
    margin: 0;
    padding: 0;
    overflow-x: hidden; /* tránh scroll ngang nếu có */
}

    body::before {
        content: "";
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: url("https://images.unsplash.com/photo-1631106256072-54c89defe828?ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&q=80&w=1920") no-repeat center center fixed;
        background-size: cover;
        filter: blur(6px) brightness(0.9); /* mờ + hơi tối để nội dung nổi bật */
        z-index: -1;
    }

/* Card vẫn giữ nguyên */
.lego-card {
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    padding: 30px;
    max-width: 600px;
    margin: 60px auto;
    border: 5px solid #00AEEF;
    position: relative;
    overflow: hidden;
}

    .lego-card::before {
        content: "";
        position: absolute;
        top: -50px;
        right: -50px;
        width: 120px;
        height: 120px;
        background: url('https://assets.lego.com/logos/v4.5.0/brand-lego.svg') no-repeat center/contain;
        opacity: 0.06;
        transform: rotate(20deg);
    }