.part {
    position: relative;
    font-size: 1rem;
}
.part .part-wrap {
    padding: 15px;
}
.part .part-image {
    max-width: 100%;
    width: 100%;
}
.part-text-center {
    text-align: center;
}
.part .part-title {
    font-size: 2em;
    font-weight: bold;
    line-height: 1.25;
}
.part .part-text {
    font-size: 1.125em;
    margin-top: .5em;
}

.part-text-gradient {
    background: linear-gradient(to right, #ffc384, #ffa446);
    -webkit-background-clip: text;
    color: transparent;
}

.part-first,
.part-features {
    background-color: #000;
    color: #fff;
    background-image: url(images/promo/first.jpg);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    padding: 3rem;
}
.part-first .part-wrap,
.part-features .part-wrap {
    max-width: 1600px;
    margin: auto;
    padding: 0;
}
.part-features {
    background-image: url(images/promo/s4_02.jpg);
}

.part-first .part-title {
    font-size: 3em;
    font-weight: bold;
}
.part-first .part-text {
    font-size: 4em;
    font-weight: bold;
    margin: 0;
}
.part-first .part-text2 {
    font-size: 1em;
    padding-bottom: 3rem;
}
.part-first .part-image-phone,
.part-features .part-image-phone {
    max-width: 100%;
}

.part-video {
    background-color: #000;
    padding: 3rem;
}
.part-video-wrap {
    max-width: 1600px;
    margin: auto;
    padding: 2rem 0 0;
}
.part-video-box {
    border: 2px solid #ffa446;
    border-radius: 2em;
    overflow: hidden;
    position: relative;
}

.part-features-items li {
    display: flex;
    align-items: center;
    margin-bottom: 2rem;
    font-size: 1.5em;
    text-overflow: ellipsis;
}
.part-features-items li i {
    width: 70px;
    height: 70px;
    display: inline-block;
    background-image: url(images/promo/s4_06.png);
    background-repeat: no-repeat;
    background-position-x: -22px;
    margin-right: 1rem;
    flex-shrink: 0;
}
.part-features-items li:nth-child(1) i {
    background-position-y: -16px
}
.part-features-items li:nth-child(2) i {
    background-position-y: -116px
}
.part-features-items li:nth-child(3) i {
    background-position-y: -217px
}
.part-features-items li:nth-child(4) i {
    background-position-y: -317px
}
.part-features-items li:nth-child(5) i {
    background-position-y: -418px
}
.part-features-items li:nth-child(6) i {
    background-position-y: -519px
}
.part-features-items li:nth-child(7) i {
    background-position-y: -620px
}
.part-features-items li:nth-child(8) i {
    background-position-y: -721px
}
.part-features-items li:nth-child(9) i {
    background-position-y: -821px
}
.part-features-items li:nth-child(10) i {
    background-position-y: -922px
}

.part-battery {
    background-color: #000;
    text-align: center;
}
.part-battery .part-t {
    font-size: 2em;
    margin: 1.5rem 0;
    font-weight: bold;
}
.part-battery .part-wrap {
    max-width: 1600px;
    margin: auto;
}

.part-speacker {
    background-color: #000;
    color: #fff;
}
.part-speacker .part-wrap {
    position: absolute;
    top: 35%;
    left: 1%;
    right: 50%;
}
.part-speacker .part-title {
    font-size: 7em;
    text-transform: uppercase;
}
.part-speacker .part-text {
    font-size: 2.3em;
}

.part-body {
    background-color: #000;
}
.part-body .part-wrap {
    padding: 3% 0;
    width: 85%;
    margin: 0 auto;
}
.part-body .part-title {
    text-align: center;
    font-weight: normal;
    margin-bottom: 1.5rem;
}

.part-body .part-row {
    display: flex;
    align-items: center;
}
.part-body .part-i {
    position: relative;
    width: 50%;
    padding: 0 15px 40px;
    font-size: 1.5em;
}
.part-body .part-i .part-t {
    position: absolute;
    top: 5%;
    left: 5%;
    right: 5%;
}
.part-body .part-i1 .part-t {
    text-align: right;
}
.part-body .part-i2 .part-t {
    right: 40%;
}
.part-body .part-i3 .part-t,
.part-body .part-i4 .part-t {
    text-align: center;
}

.part-rugged {
    padding: 2% 0;
}
.part-rugged .part-title {
    text-align: center;
    font-weight: normal;
    margin-bottom: 1.5rem;
}
.part-rugged .part-wrap2 {
    max-width: 1820px;
    margin: auto;
    text-align: center;
    padding: 3% 0;
}
.part-rugged .part-h {
    padding-top: 5px;
    font-weight: bold;
    font-size: 2em;
}
.part-rugged .part-t {
    line-height: 1.2;
    font-size: 1.25em;
}

@media (max-width: 769px) {
    .part-first,
    .part-features,
    .part-video {
        padding: 1rem;
    }

    .part-speacker .part-wrap {
        position: initial;
        top: auto;
        left: auto;
        right: auto;
    }
    .part-speacker .part-title {
        font-size: 2em;
    }
    .part-speacker .part-text {
        font-size: 1.25em;
    }

    .part-body .part-wrap {
        width: 100%;
        padding: 1rem;
    }
    .part-body .part-row {
        flex-wrap: wrap;
    }
    .part-body .part-i {
        width: 100%;
        font-size: 1.125em;
        line-height: 1.2;
        padding: 0 0 40px;
    }
    .part-rugged .part-wrap2 {
        padding: 1rem;
    }
    .part-rugged .part-wrap2 img {
        max-width: 320px;
    }
    .part-rugged .part-t {
        padding-bottom: 40px;
    }
}

@media (max-width: 480px) {
}

@media (max-width: 380px) {
    .part-first .part-title {
        font-size: 2.5em;
    }
    .part-first .part-text {
        font-size: 3em;
    }
    .part-features-items li {
        font-size: 1em;
    }
    .part-battery .part-t {
        font-size: 1.125em;
        line-height: 1.2;
    }
    .part-rugged .part-wrap2 img {
        max-width: 230px;
    }
}