* {
    /* box-sizing: border-box; */
    font-family: 'Montserrat';
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

:root {
    --primary-color: black;
    --secondary-color: white;
    --link-color: darkblue;
    --image-caption-color: darkblue;

    --body-background-color: white;
    --nav-backgroud-color: lightblue;
    --button-background-color: darkblue;
    --hover-color: rgba(0, 0, 139, 0.8);
    --content-background-color: whitesmoke;
}

.dark-theme {
    --primary-color: rgb(245, 245, 245);
    --secondary-color: black;
    --link-color: lightblue;
    --image-caption-color: lightblue;

    --body-background-color: black;
    --nav-backgroud-color: hsl(240, 80%, 30%);
    --button-background-color: lightblue;
    --hover-color: rgba(173, 216, 230, 0.8);
    --content-background-color: rgb(40, 40, 40);
}

/* Try different color theme */
:root {
    --primary-color: #06283D;
    --secondary-color: #E8F9FD;
    --link-color: #0035b9;
    --image-caption-color: #0035b9;

    --body-background-color: #E8F9FD;
    --nav-backgroud-color: #79DAE8;
    --button-background-color: #001E6C;
    --hover-color: #0035b9;
    --content-background-color: #dfeff3;
}
.dark-theme {
    --primary-color: #E8F9FD;
    --secondary-color: #06283D;
    --link-color: #79DAE8;
    --image-caption-color: #79DAE8;

    --body-background-color: black;
    --nav-backgroud-color: #001E6C;
    --button-background-color: #79DAE8;
    --hover-color: #65b8c5;
    --content-background-color: #06283D;
}

body {
    background-color: var(--body-background-color);
    /* background: linear-gradient(rgb(255, 72, 0), rgb(0, 68, 255)); */
}

li, a, button {
    text-decoration: none;
}

/* 1. header */
.header {
    display: flex;
    justify-content: space-between;
    position: fixed; 
    top: 0px;
    width: 94%;
    align-items: center;
    margin: 0px;
    padding: 5px 3%;
    background-color: var(--nav-backgroud-color);
}
/* 1.1 logo */

.header a {
    display: inline-block;
    height: 100%;
    vertical-align: middle;
}

.logo {
    width: 150px;
    cursor: pointer;
    vertical-align: middle;
}

/* 1.2 navigation bar */
nav {
    font-size: 25px;
}
.nav_links {
    list-style: none;
}
.nav_links li {
    display: inline-block;
    vertical-align: center;
    padding: 0px 30px;
}
.nav_links li a {
    color: var(--primary-color);
    transition: all 0.3s ease 0s;
}
.nav_links li a:hover {
    color: var(--hover-color);
}

/* 1.3 control panals: language and mode buttons */
.controls {
    display: flex;
    align-items: center;
    /* margin: 0; */
}

#langBtn {
    padding: 8px 10px;
    color: var(--secondary-color);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease 0s;
    font-size: 20px;
    margin-right: 10px;
    background-color: var(--button-background-color);
}

#themeIcon {
    /* padding: 8px 10px; */
    margin-left: 10px;
    cursor: pointer;
    background-color: var(--nav-backgroud-color);
    width: 24px;
    height: 24px;
}

button:hover {
    background-color: var(--hover-color);
}

/* tablet */
@media screen and (max-width: 1024px) {

    .logo {
        width: 125px;
    }
    nav {
        font-size: 20px;
    }
    .nav_links li {
        padding: 0px 15px;
    }
    .nav_links li a {
        padding: 0px 15px;
    }
    #langBtn {
        padding: 6px 8px;
        border-radius: 35px;
        font-size: 15px;
        margin-right: 10px;
    }
    #themeIcon {
        /* padding: 6px 8px; */
        margin-left: 10px;
        cursor: pointer;
        background-color: var(--nav-backgroud-color);
        width: 20px;
        height: 20px;
    }
}

/* phone */
@media screen and (max-width: 800px) {
    .logo {
        width: 90px;
        position: relative;
    }
    .nav_links li {
        padding: 0px 4px;
        position: relative;
    }
    .nav_links li a {
        font-size: 16px;
        padding: 0px 4px;
    }
    
    #langBtn {
        padding: 4px 5px;
        border-radius: 35px;
        font-size: 15px;
        margin-right: 5px;
    }
    
    #themeIcon {
        /* padding: 4px 5px; */
        margin-left: 5px;
        cursor: pointer;
        background-color: var(--nav-backgroud-color);
        width: 16px;
        height: 16px;
    }
}

/* small phone */
@media screen and (max-width: 500px) {
    .header {
        width: 98%;
        padding: 2px 1%;
    }

    .logo {
        width: 65px;
        position: relative;
    }
    .nav_links li {
        padding: 0px 2px;
        position: relative;
    }
    .nav_links li a {
        font-size: 14px;
    }

    #langBtn {
        padding: 4px 5px;
        border-radius: 25px;
        font-size: 10px;
        margin-right: 3px;
    }
    
    #themeIcon {
        padding: 4px 5px;
        margin-left: 3px;
        cursor: pointer;
        background-color: var(--nav-backgroud-color);
        width: 12px;
        height: 12px;
    }
}

/* ------------------------------------------- */

/* 2. content */

.content {
    width: 1200px; 
    margin:auto;
    text-align: justify;
    text-justify:inter-ideograph;
}

/* home (testing) 手機上排版仍有問題故先隱藏*/
.home {
    /* position: fixed; */
    /* display: flex; */
    display: none;
    justify-content: center;
    align-items: center;
    margin: 0px;
    width: 100%;
    height: 100vh;  /* viewport height */
}
.banner {
    font-size: 150px;
    font-weight: 400;
    font-stretch: ultra-expanded;
    text-align: center;

    /* enforce text to overflow */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: clip;

    color: white;
    transition: 0.5s;
}
.banner:hover {
    -webkit-text-stroke: 2px white;
    color: transparent;
}
.background-video {
    position: absolute;
    /* 讓影片不回超出右視窗右方與下方 */
    right: 0;
    bottom: 0;
    /* 將影片設為堆疊的最後才不會遮擋標題文字 */
    z-index: -1;
    transition: 0.5;
}

/* @media (min-aspect-ratio: 16/9) {
    .background-video {
        width: 100%;
        height: auto;
    }
} */
@media (max-aspect-ratio: 16/9) {
    .background-video {
        width: auto;
        height: 100%;
    }
}

.about, .product-and-service, .contact{
    background-color: var(--content-background-color);
    border-radius: 18px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    /* align-items: top; */
    margin-top: 100px;
    margin-bottom: 100px;
}

.home-title, .about-title, .product-and-service-title, .contact-title {
    flex: none;
    width:1200px;
    font-size: 30px;
    margin-bottom: 30px;
    font-weight: bold;
    text-align: center;
    color: var(--primary-color);
}

.contact-title {
    width:100%;
}

.home-text, .about-content, .product-text {
    flex: initial;
    width: 580px;
    padding: 10px;
    font-size: 20px;
    font-weight:normal;
    line-height: 40px;
    color: var(--primary-color);
    /* 文字左右對齊 */
    text-align: justify;
    text-justify:inter-ideograph;
    /* border: 3px blue solid; */
}

.about-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.about-text, iso-certificate {
    justify-content: center;
}

.iso-caption {
    text-align: center; 
    font-weight: bold;
}

.home-img, .about-img {
    flex: none;
    width: 600px;
    text-align: center;
}

/* product */
.product, .service {
    flex: none;
    width: 700px;
    margin-bottom: 20px;
    color: var(--primary-color);
    text-align: left;   
}
.product .product-title, .service .service-title {
    font-size: 25px;
    font-weight: bold;
    padding-left: 20px;
    padding-right: 20px;
    margin-bottom: 10px;
}
.service-title2 {
    font-weight: bold;
    font-size: 22px;
}
.product .product-text, .service .service-text {
    flex: 3;
    font-size: 20px;
    padding-left: 20px;
    padding-right: 20px;
    text-align: left;
    line-height: 40px;
    /* 文字左右對齊 */
    text-align: justify;
    text-justify:inter-ideograph;
}

/* service */
.service .service-text a {
    color: var(--link-color);
}
.service .service-text ul {
    padding-left: 30px;
}
.product-img, .service-img {
    flex: 2;
    color: var(--image-caption-color);
    text-align: center;
}
.product-img p, .service-img p {
    font-size: 25px;
    margin-bottom: 10px;
}
.product-img .first {
    height: 150px;
}
.product-img .second {
    height: 125px;
}
.product-img .third {
    height: 200px;
}
.service-img {
    margin-top: 30px;
    margin-right: 100px;
    margin-bottom: 20px;
    width: 500px;
}

/* contact */
.contact {
    width: 100%;
    border-radius: 0%;
    background-color: var(--nav-backgroud-color);
    margin: 0px;
    padding-top: 20px;
    padding-bottom: 50px;
}
.contact_list {
    flex: auto;
    display: flex;
    justify-content: center;
    align-items: center; 
    list-style: none;
}
.contact_list li {
    flex: space-around;
    font-size: 20px;
    padding: 5px 10px;
    margin: 0px 20px;
    color: var(--secondary-color);
    text-align: center;
    background-color: var(--button-background-color);
    border-radius: 15px;
    transition: all 0.3s ease 0s;
    cursor: pointer;
}

.contact_list li:hover {
    font-size:21px;
    background-color: var(--hover-color);
}
.contact_list li a {
    color: var(--secondary-color);
}
.contact_list a li:hover {
    background-color: var(--hover-color);
}

/* tablet */
@media screen and (max-width: 1200px) {
    .banner {
        font-size: 125px;
    }

    .content{
        width: 100%;
    }

    .about, .product-and-service, .contact{
        border-radius: 18px;
        margin-top: 100px;
        margin-bottom: 50px;
        margin-left: 10px;
        margin-right: 10px;
    }
    
    .home-title, .about-title, .product-and-service-title, .contact-title {
        width: 100%;
        font-size: 25px;
        margin-bottom: 10px;
    }
    
    .home-text, .about-text, .product-text {
        width: 44%;
        padding: 3%;
        font-size: 16px;
        line-height: 32px;
    }

    .home-img, .about-img {
        width: 48%;
        /* font-size: 16px; */
    }
    
    .about-img img {
        width: 250px;
    }

    /* product */
    .product, .service {
        width: 48%;
        margin-bottom: 20px;
    }

    .product .product-title, .service .service-title {
        font-size: 20px;
        padding-left: 1%;
        padding-right: 1%;
        margin-bottom: 5px;
    }
    .service-title2 {
        font-size: 18px;
    }
    .product .product-text, .service .service-text {
        width: 98%;
        padding-left: 1%;
        padding-right: 1%;
        font-size: 16px;
        line-height: 32px;
    }
    
    /* service */
    
    .service .service-text ul {
        padding-left: 30px;
    }
    
    .product-img, .service-img {
        /* flex: none; */
        width: 48%;
        font-size: 16px;
        margin: 0px;
        text-align: center;
    
    }
    
    .product-img p, .service-img p {
        font-size: 20px;
        margin-bottom: 10px;
    }

    .product-img .first {
        height: 100px;
    }

    .product-img .second {
        height: 75px;
    }

    .product-img .third {
        height: 150px;
    }

    .service-img {
        margin-top: 25px;
        width: 35%;
        margin: 7.5%;
    }

    /* contact */
    .contact {
        /* display: block; */
        border-radius: 0%;
        margin: 0px;
        padding-top: 10px;
        padding-bottom: 25px;
    }

    .contact_list {
        /* display: block; */
        flex-wrap: wrap;
    }
    
    .contact_list li {
        font-size: 12px;
        padding: 3px 6px;
        margin: 10px 10px;
        border-radius: 8px;
    }
    
    .contact_list li:hover {
        font-size: 13px;
    }
}

/* phone */
@media screen and (max-width: 800px) {
    .home {
        font-size: 100px;
    }
    .content{
        width: 100%;
    }

    .about, .product-and-service, .contact{
        border-radius: 18px;
        margin-top: 50px;
        margin-bottom: 50px;
    }
    
    .home-title, .about-title, .product-and-service-title, .contact-title {
        width: 100%;
        font-size: 20px;
        margin-bottom: 10px;
    }
    
    .home-text, .about-text, .product-text {
        width: 94%;
        padding: 3%;
        font-size: 15px;
        line-height: 28px;
    }

    .home-img, .about-img {
        width: 98%;
        font-size: 16px;
    }
    
    .about-img img {
        width: 150px;
    }

    /* product */
    .product, .service {
        width: 98%;
        margin-bottom: 20px;
    }

    .product .product-title, .service .service-title {
        font-size: 18px;
        padding-left: 1%;
        padding-right: 1%;
        margin-bottom: 5px;
    }
    .service-title2 {
        font-size: 16px;
    }
    .product .product-text, .service .service-text {
        width: 98%;
        font-size: 15px;
        padding-left: 1%;
        padding-right: 1%;
        line-height: 28px;
    }
    
    /* service */
    
    .service .service-text ul {
        padding-left: 30px;
    }
    
    .product-img, .service-img {
        flex: none;
        width: 98%;
        font-size: 16px;
        margin: 0px;
        text-align: center;
    
    }
    .service-img {
        width: 48%;
    }
    .product-img p, .service-img p {
        font-size: 16px;
        margin-bottom: 5px;
    }

    .product-img .first {
        height: 75px;
    }

    .product-img .second {
        height: 67.5px;
    }

    .product-img .third {
        height: 100px;
    }

    .service-img {
        margin-top: 15px;
        width: 250px;
    }

    /* contact */
    .contact {
        /* display: block; */
        border-radius: 0%;
        margin: 0px;
        padding-top: 10px;
        padding-bottom: 25px;
    }

    .contact_list {
        /* display: block; */
        flex-wrap: wrap;
    }
    
    .contact_list li {
        font-size: 10px;
        padding: 2.5px 5px;
        margin: 10px 10px;
        border-radius: 7.5px;
    }
    
    .contact_list li:hover {
        font-size: 11px;
    }
}