.hero-section {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

#myVideo {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -1;
    transform: translate(-50%, -50%);
    object-fit: cover;
    /* Giữ tỷ lệ video luôn đẹp */
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    /* Làm tối video để nổi bật chữ */
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding-left: 10rem;
    padding-bottom: 1rem;
}

.banner-video-heading {
    font-size: 5rem;
    line-height: 5rem;
}

/* --- 3. NÚT ĐIỀU KHIỂN (Góc dưới bên phải) --- */
#btnControl {
    align-self: end;
    z-index: 10;
    /* Đảm bảo nút luôn nằm trên tất cả các lớp */
    margin-right: 20px;
    margin-bottom: 20px;
    padding: 10px 25px;
    font-size: 16px;
    background: transparent;
    color: white;
    border: 2px solid white;
    border-radius: 30px;
    cursor: pointer;
    transition: 0.3s;
}

#btnControl:hover {
    background: white;
    color: black;
}

@media screen and (max-width: 480px) {
    .hero-section {
        position: relative;
        width: 100%;
        height: 85vh;
    }

    .hero-content {
        padding-left: 1rem;
        padding-bottom: 1rem;
        gap: 1rem;
    }

    .banner-video-heading {
        font-size: 2rem;
        line-height: 2rem;
    }

    #btnControl {
        align-self: flex-start;
        margin-bottom: 0;
    }
}