.introduction {
    background: #f5f5f5;
    padding: 110px 60px 30px 60px;
}

.introduction .container {
    max-width: 1200px;
    margin: 0 auto;
}

.introduction-title{
    font-weight: 700;
    font-size: 48px;
    margin-bottom: 30px;
}

.introduction-subtitle {
    font-weight: 600;
    font-size: 26px;
    color: #5F5E5E;
    margin-bottom: 24px;
}

.introduction-video-container {
    position: relative;
    width: 100%;
    max-width: 1015px;
    margin: 0 auto;
    aspect-ratio: 16 / 9;
    border-radius: 13px;
    overflow: hidden;
}

.introduction-video-poster {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.introduction-video {
    position: absolute;
    width: 100%;
    height: 100%;
    display: block;
    outline: none;
    border: none;
    box-shadow: none;
}

.introduction-video-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 88px;
    height: 88px;
    border: 3px solid #FFFFFF33;
    border-radius: 50%;
    background-color: #FFFFFF33;
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: opacity 0.3s ease;
}

.introduction-video-btn img {
    margin-left: 30px;
}

@media screen and (max-width: 750px) {
    .introduction {
        padding: 60px 14px 40px 14px;
    }

    .introduction-title{
        font-size: 28px;
        margin-bottom: 23px;
    }

    .introduction-subtitle {
        font-size: 16px;
        margin-bottom: 20px;
    }
}

@media screen and (max-width: 650px) {
    .introduction-video-btn {
        transform: scale(0.8) translate(-50%, -50%);
    }
}

@media screen and (max-width: 425px) {
    .introduction-video-container {
        border-radius: 10px;
    }

    .introduction-video-btn {
        transform: scale(0.5) translate(-100%, -100%);
    }
}