html {
    font-size: 16px;
}

@media screen and (min-width: 375px) {
    html {
        /* iPhone6的375px尺寸作为16px基准，414px正好18px大小, 600 20px */
        font-size: calc(100% + 2 * (100vw - 375px) / 39);
        font-size: calc(16px + 2 * (100vw - 375px) / 39);
    }
}
@media screen and (min-width: 414px) {
    html {
        /* 414px-1000px每100像素宽字体增加1px(18px-22px) */
        font-size: calc(112.5% + 4 * (100vw - 414px) / 586);
        font-size: calc(18px + 4 * (100vw - 414px) / 586);
    }
}
@media screen and (min-width: 600px) {
    html {
        /* 600px-1000px每100像素宽字体增加1px(20px-24px) */
        font-size: calc(125% + 4 * (100vw - 600px) / 400);
        font-size: calc(20px + 4 * (100vw - 600px) / 400);
    }
}
@media screen and (min-width: 1000px) {
    html {
        font-size: 22px;
    }
}

header {
    max-width: 768px;
    background-color: rgba(2, 8, 19, 1);
}
.download-bottom {
    max-width: 768px;
    background-color: #333;
    padding: 15px;
}

header .logo {
    width: 65px;
}

header .download {
    width: 40%;
}

@media screen and (min-width: 768px) {
    header .download {
        width: 20%;
    }
}

main {
    max-width: 768px;
}

.banner {
    background-image: url('../images/ld_bg01.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    padding-top: 235px;
    padding-bottom: 235px;
}

.banner .slogan {
    margin-top: 5rem;
}

.banner .download-container {
    margin-top: 5rem;
}

.about-us {
    background-image: url('../images/ld_bg02.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

@media screen and (min-width: 576px) {
    .about-us p {
        font-size: 1.5rem;
    }
}

.about-us .video-container {
    background-image: url('../images/ld_02_video_bg.png');
    background-repeat: no-repeat;
    background-size: contain;
    background-position: center;
    padding: 12vw 2vw;
}


/* .about-us .embed-responsive-16by9::before {
    background-image: url('../images/ld_02_video_bg.png');
    background-repeat: no-repeat;
    background-size: contain;
    background-position: center;

} */

.about-us .embed-responsive-16by9::after {
    display: block;
    content: "";
    background-image: url('../images/ld_02_btn_play.png');
    background-repeat: no-repeat;
    background-size: contain;
    background-position: center;
    position: absolute;
    width: 50px;
    height: 50px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.about-us .hide.embed-responsive-16by9::after { 
    display: none;
}

.battleship {
    background-image: url('../images/ld_bg03.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

@media screen and (min-width: 576px) {
    .battleship p {
        font-size: 1.5rem;
    }
}

.battleship .swiper-container {
    width: 100%;
    height: 100%;
    background-image: url('../images/ld_03_aperture.png');
    background-repeat: no-repeat;
    background-size: 100%;
    background-position: center 0;
}

.battleship .swiper-wrapper {
    align-items: center;
}

.battleship .swiper-slide {
    text-align: center;
    font-size: 18px;
    /* background: #fff; */

    /* Center slide text vertically */
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
}

.battleship .swiper-ship-button {
    background-repeat: no-repeat;
    background-size: 100%;
    background-position: center;
    width: 50px;
    height: 50px;
    top: 20%;
    z-index: 2;
}

.battleship .swiper-ship-button-prev {
    background-image: url('../images/ld_03_arrow_left.png');
    left: 0;
}

.battleship .swiper-ship-button-next {
    background-image: url('../images/ld_03_arrow_right.png');
    right: 0;
}


.battleship .swiper-slide img {
    margin-bottom: 30vw;
}

@media screen and (min-width: 576px) {
    .battleship .swiper-slide img {
        margin-bottom: 16vw;
    }
}

.battleship .swiper-slide .data {
    background-image: url('../images/ld_03_data_bg.png');
    background-repeat: no-repeat;
    background-size: 100%;
    background-position: center;
    width: 100%;
    height: 16rem;
    color: #fff;
    display: flex;
    align-items: center;
}

@media screen and (min-width: 768px) {
    .battleship .swiper-slide .data {
        height: 77vw;
    }
}

@media screen and (min-width: 1024px) {
    .battleship .swiper-slide .data {
        height: 25rem;
    }
}

.battleship .data .data_title {
    font-size: 2rem;
    line-height: 1;
}

.battleship .data .sub-title {
    font-size: 0.8rem;
}

.battleship .data .data_body {
    font-size: 10px;
}

@media screen and (min-width: 768px) {
    .battleship .data .data_body {
        font-size: 1rem;
    }
}

/* @media screen and (min-width: 1024px) {
    .battleship .data .data_title {
        font-size: 3rem;
    }
    .battleship .data .sub-title {
        font-size: 1.2rem;
    }
    .battleship .data .data_body {
        font-size: 1.8rem;
    }
} */

.battleship .data .data_body .row {
    margin-left: 0;
    margin-right: 0;
}

.battleship .data .data_body .col-6 {
    padding-left: 5px;
    padding-right: 5px;
}


.battleship .data .data_line {
    background-image: url('../images/ld_03_form_line.png');
    background-position: center;
    background-repeat: no-repeat;
    background-size: 100%;
    height: 3px;
    width: 50%;
}

.battleship .data .data_body .key {
    background-color: #02232D;
    color: #01CAD8;
    font-weight: 400;
}

.battleship .ship-list .ship {
    background-position: center;
    background-repeat: no-repeat;
    background-size: 100%;
    width: 100%;
    height: 30vw;
}


@media screen and (min-width: 1024px) {
    .battleship .ship-list .ship {
        height: 12rem;
    }
}

.battleship .ship-list .achilles {
    background-image: url('../images/ship_achilles_nor.png');
}
.battleship .ship-list .achilles.active {
    background-image: url('../images/ship_achilles_sel.png');
}

.battleship .ship-list .artemis {
    background-image: url('../images/ship_artemis_nor.png');
}

.battleship .ship-list .artemis.active {
    background-image: url('../images/ship_artemis_sel.png');
}

.battleship .ship-list .nemesis {
    background-image: url('../images/ship_nemesis_nor.png');
}

.battleship .ship-list .nemesis.active {
    background-image: url('../images/ship_nemesis_sel.png');
}

.battleship .ship-list .theseus {
    background-image: url('../images/ship_theseus_nor.png');
}

.battleship .ship-list .theseus.active {
    background-image: url('../images/ship_theseus_sel.png');
}

.crew {
    background-image: url('../images/ld_bg04.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

@media screen and (min-width: 576px) {
    .crew p {
        font-size: 1.5rem;
    }
}

/* .crew .swiper-container .swiper-slide {
    height: 100%;
} */

.crew .character {
    background-position: center;
    background-repeat: no-repeat;
    background-size: 100%;
    width: 100%;
    height: 30vw;
}

@media screen and (min-width: 1024px) {
    .crew .character {
        height: 11rem;
    }
} 

.crew .character.helen {
    background-image: url('../images/crew_helen_nor.png');
}

.crew .character.helen.active {
    background-image: url('../images/crew_helen_sel.png');
}

.crew .character.laura {
    background-image: url('../images/crew_laura_nor.png');
}

.crew .character.laura.active {
    background-image: url('../images/crew_laura_sel.png');
}

.crew .character.malthus {
    background-image: url('../images/crew_malthus_nor.png');
}

.crew .character.malthus.active {
    background-image: url('../images/crew_malthus_sel.png');
}

.crew .character.greg {
    background-image: url('../images/crew_greg_nor.png');
}

.crew .character.greg.active  {
    background-image: url('../images/crew_greg_sel.png');
}

/* .crew .swiper-container { */

    /* height: 120vw; */
/* } */

/* .crew .swiper-container .swiper-slide {
    background-color: transparent;
    background-image: url('../images/ld_04_introduction_bg.png');
    background-repeat: no-repeat;
    background-position: center;
    background-size: 100%;
    height: 117vw;

} */

.crew .swiper-container .swiper-slide .card {
    background-color: transparent;
}

.crew .swiper-container .swiper-slide .card .card-body {
    padding: 0.8rem;
}

.crew .swiper-container .swiper-slide .card-img-top  {
    width: 52%;
    margin: 0 auto;
    margin-top: 14vw;
}

.crew .swiper-container .swiper-slide p.card-text {
    color: #fff;
}

/* @media screen and (max-width: 500px) {
    .crew .swiper-container .swiper-slide p.card-text {
        line-height: 16px;
    }
} */

@media screen and (max-width: 375px) {
    .crew .swiper-container .swiper-slide p {
        font-size: 14px;
    }
}



/* .crew .swiper-container .swiper-slide .card {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
} */

.crew .swiper-ship-button {
    background-repeat: no-repeat;
    background-size: 100%;
    background-position: center;
    width: 3.5rem;
    height: 3.5rem;
}

.crew .swiper-ship-button-prev {
    background-image: url('../images/ld_03_arrow_left.png');
}

.crew .swiper-ship-button-next {
    background-image: url('../images/ld_03_arrow_right.png');
}

.footer {
    background-color: rgba(2, 8, 19, 1);
    color: #fff;
}