* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
    user-select: none;
    font-family: sans-serif;
    scroll-behavior: smooth;
}


.w {
    margin: 0 auto;
}
#xuanchuan {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    z-index: -999;
    top: 0;
    left: 0;
}

.vis {
    opacity: 0;
    transition: opacity 1s ease, transform 1s ease;
}

.vis.visible {
    opacity: 1;
}

#section1 {
    height: 100vh;
    background-color: rgba(0,0,0,0.5);
    background-blend-mode: overlay;
    background-repeat: no-repeat;
    background-size: cover;
    
    header {
        position: fixed;
        z-index: 1000;
        top: 0;
        width: 100%;
        background: rgba(0,0,0,0.2);
        backdrop-filter: blur(5px);
        transition: all 0.4s ease;
        @media screen and (max-width: 460px) {
            .w {
                nav {
                    display: none;
                }
            }
        }
        .w {
            display: flex;
            height: 60px;
            align-items: center;
            gap: 2rem;
        }

        .logo {
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            margin: 10px;
            font-weight: bold;
            font-size: 1.8rem;
            letter-spacing: 2px;
            color: white;
        }

        nav {
            margin-right: auto;
            display: flex;
            gap: 2.5rem;

            a {
                color: white;
                font-size: 15px;
                white-space: nowrap;

                &:hover {
                    transition: 0.15s ease-out;
                    color: #209978;
                }
            }
        }
    }

    .container {
        height: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-align: center;
        color: #fff;

        h1 {
            font-size: 4rem;
            padding-bottom: 3rem;
            letter-spacing: 4px;
        }

        h3,h5{
            font-weight: 500;
            color: rgba(237, 237, 237,0.9);
            margin: 7px 0;
            font-size: 15px;
            letter-spacing: 1px;
        }

        h3 {
            font-style: italic;
        }

        h5 {
            font-weight: bold;

            span {
                font-weight: 500;
                margin-left: 10px;
                color: rgba(55, 202, 20, 0.9);
            }
        }

        .button {
            position: relative;
            width: 150px;
            height: 40px;
            cursor: pointer;
            display: flex;
            align-items: center;
            border: 1px solid #17795E;
            background-color: #209978;
            overflow: hidden;
            margin-top: 3rem;
        }

        .button, .button__icon, .button__text {
            transition: all 0.3s;
        }

        .button .button__text {
            transform: translateX(22px);
            color: #fff;
            font-weight: 600;
        }

        .button .button__icon {
            position: absolute;
            transform: translateX(109px);
            height: 100%;
            width: 39px;
            background-color: #17795E;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .button .svg {
            width: 20px;
            fill: #fff;
        }

        .button:hover {
            background: #17795E;
        }

        .button:hover .button__text {
            color: transparent;
        }

        .button:hover .button__icon {
            width: 148px;
            transform: translateX(0);
        }

        .button:active .button__icon {
            background-color: #146c54;
        }

        .button:active {
            border: 1px solid #146c54;
        }
    }

    .on {
        color: #209978;
        font-weight: bold;
    }
}

#section2 {
    padding: 6rem 0;
    @media screen and (max-width: 600px) {
        .w {
            flex-direction: column;
            .right1 {
                width: 100%!important;
            }
            .right {
                display: inline-grid;
                img {
                    height: 100%;
                }
            }
        }
    }
    @media screen and (min-width: 600px) and (max-width: 1030px){
        .w {
            .right1 {
                width: 40%!important;
                grid-template-columns: auto!important
            }
        }
    }

    .w {
        display: flex;
        gap: 5rem;
        .left {
            flex: 1;

            h3 {
                font-size: 1.8rem;
                padding-bottom: 10px;
            }

            p {
                font-size: 15px;
                color: #333;
                line-height: 2;
                text-indent: 2rem;
                letter-spacing: 1px;
            }

            .share {
                margin-top: 1rem;
                margin-left: 2rem;
                display: flex;
                align-items: center;
                gap: 5px;

                img {
                    width: 14px;
                }

                a {
                    color: #209978;

                    &:hover {
                        text-decoration: underline;
                    }
                }
            }
        }
        .right1 {
            display: grid; 
            width: 60%;
            height:100%; 
            grid-row-gap: 2px;
            grid-template-columns: auto auto
        }
        .right {
            display: inline-grid;
            img {
                width: 100%;
            }
        }
    }
}

#section3 {
    padding: 6rem 0;
    display: flex;
    flex-direction: column;

    h1 {
        margin-bottom: 3rem;
        font-size: 1.8rem;
        text-align: center;
    }

    .row {
        display: flex;
        background: whitesmoke;

        .img {
            width: 50%;

            img {
                width: 100%;
                object-fit: cover;
            }
        }

        .inf {
            width: 50%;
            padding: 5rem;

            h3 {
                font-size: 1.8rem;
                padding-bottom: 10px;
            }

            p {
                color: #333;
                line-height: 2;
                letter-spacing: 1px;
            }
        }
    }
}

#section4 {
    padding: 6rem 0;

    .w {
        h1 {
            margin-bottom: 3rem;
            font-size: 1.8rem;
            text-align: center;
        }

        .img-wall {
            columns: 5 500px;
            column-gap: 10px;

            img {
                display: block;
                margin-bottom: 10px;
                width: 100%;
            }
        }
    }
}

footer {
    padding: 3rem 0;
    background: #161616;

    h3 {
        margin-bottom: 1rem;
        color: #fff;
    }

    a {
        display: block;
        margin-bottom: 5px;
        color: #f4f4f4;
        font-size: 13px;

        &:hover {
            text-decoration: underline;
        }
    }
}

#backTop {
    cursor: pointer;
    display: none;
    justify-content: center;
    align-items: center;
    position: fixed;
    right: 2.5rem;
    bottom: 10rem;
    width: 38px;
    height: 38px;
    background: #ffffff;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
    transition: all 0.25s ease;

    &:hover {
        transform: scale(1.08);
    }

    &:active {
        transform: scale(0.95);
    }
}