:root {
    --primary-blue: #4B3FDE;
    --accent-red: #FF3B3B;
    --text-gray: #B8C5E0;
    --text-dark: #2C3E50;
    --border-color: rgba(255,255,255,0.1);
    --glass-bg: rgba(255,255,255,0.05);
    --sidebar-bg: linear-gradient(180deg, #DEEAFF 0%, #DEEAFF 56%, #fff 100%);
    --header-bg: #3523bd;
    --header-gradient: #00000096;
    --main-color: #18F2BF;
    --text-color: white;
    --body-bg: linear-gradient(135deg, #3F28CE, #0D0E29);
    --footer-bg: #271B80;
    --cate-gradient: linear-gradient(0deg, #076EFF 0%, #4FABFF 30%, #B1C5FF 55%, #fff 100%);
    --stt-bg: #004BFD;
    --bg-button: #0056fb;
    --bg-popup: #EBF1FF;
}

@font-face {
    font-family: 'HelveticaNeue Neue';
    src: url("../fonts/HelveticaNeue-Roman.eot");
    src: url("../fonts/HelveticaNeue-Roman.eot?#iefix") format("embedded-opentype"), url("../fonts/HelveticaNeue-Roman.woff") format("woff"), url("../fonts/HelveticaNeue-Roman.ttf") format("truetype"), url("../fonts/HelveticaNeue-Roman.svg#HelveticaNeue-Roman") format("svg");
    font-weight: normal;
    font-style: normal;
    font-display: swap
}

@font-face {
    font-family: 'HelveticaNeue Neue';
    src: url("../fonts/HelveticaNeue-Bold.eot");
    src: url("../fonts/HelveticaNeue-Bold.eot?#iefix") format("embedded-opentype"), url("../fonts/HelveticaNeue-Bold.woff") format("woff"), url("../fonts/HelveticaNeue-Bold.ttf") format("truetype"), url("../fonts/HelveticaNeue-Bold.svg#HelveticaNeue-Bold") format("svg");
    font-weight: bold;
    font-style: normal;
    font-display: swap
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'HelveticaNeue Neue';
    background: var(--body-bg);
    color: var(--text-color);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    width: calc(100% - 200px);
    margin: 0 auto;
    max-width: 1200px
}

.imgc {
    display: block;
    position: relative;
}

    .imgc:before {
        content: "";
        display: block;
        padding-bottom: 60%
    }

    .imgc img, .imgc iframe {
        display: block;
        position: absolute;
        z-index: 2;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover
    }

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1998;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

    .sidebar-overlay.show {
        opacity: 1;
        visibility: visible;
    }

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 400px;
    height: 100%;
    background: var(--sidebar-bg);
    z-index: 1999;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

    .sidebar.show {
        transform: translateX(0);
    }

.sidebar-header {
    padding: 1rem;
    display: flex;
    justify-content: flex-end;
}

.sidebar-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-dark);
    cursor: pointer;
    padding: 0.5rem;
}

.sidebar-content {
    flex: 1;
    padding: 1rem 2rem;
    overflow-y: auto;
}

.home-link {
    font-weight: bold;
    margin-bottom: 40px;
    font-size: 18px;
    display: block;
    color: #000;
    text-decoration: none
}

    .home-link:hover {
        color: var(--header-bg)
    }

.timeline-item {
    margin-bottom: 30px;
    line-height: 1.5;
}

    .timeline-item .title {
        font-size: 18px;
        font-weight: bold;
        text-decoration: none;
        color: #000
    }

        .timeline-item .title:hover {
            color: var(--header-bg)
        }

.sidebar-footer {
    padding: 2rem;
    text-align: center;
}

    .sidebar-footer p {
        color: var(--text-dark);
        font-size: 0.9rem;
        margin: 0;
    }

.header {
    background-image: linear-gradient(180deg, #00000096, transparent);
    background-color: #3523bd;
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: grid;
    align-items: center;
    width: calc(100% - 200px);
    max-width: 1480px;
    margin: 0 auto;
    grid-template-columns: 1fr auto 1fr
}

.header-left {
    display: flex;
    align-items: center;
    gap: 2rem;
}

    .header-left .nav-text {
        color: var(--text-color);
        font-size: 0.9rem;
        text-decoration: none
    }

        .header-left .nav-text:hover {
            color: var(--main-color)
        }

.menu-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.brand-logo {
    width: 300px
}

    .brand-logo:before {
        padding-bottom: 19%
    }

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    justify-content: right
}

.chat-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
}

.social-icons {
    display: flex;
    gap: 1rem;
}

    .social-icons a {
        color: var(--text-color);
        font-size: 1.1rem;
        transition: color 0.3s ease;
    }

        .social-icons a:hover {
            color: var(--text-color);
        }

.btn-more {
    text-align: center
}

    .btn-more a {
        display: inline-block;
        text-decoration: none;
        color: var(--text-color);
        padding: 0 20px;
        font-weight: bold;
        line-height: 50px;
        border-radius: 15px;
        background-color: #14151750
    }

        .btn-more a:after {
            content: url(images/arrow.svg);
            display: inline-block;
            margin-left: 10px;
            transform: translateY(2px);
            -webkit-transform: translateY(2px);
            -moz-transform: translateY(2px)
        }

        .btn-more a:hover {
            color: var(--main-color);
            background-color: #0c0a24
        }

.hero-section {
    padding: 4rem 0;
    position: relative;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
    width: calc(100% - 200px);
    max-width: 1480px;
    margin: 0 auto;
    border-bottom: 1px solid var(--main-color);
    padding-bottom: 100px
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-self: center;
    padding-right: calc(100% - 600px)
}

    .hero-content h1 {
        font-size: 100px;
        font-weight: 700;
        margin-bottom: 2rem;
        line-height: 1.1;
    }

.hero-subtitle {
    font-size: 50px;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.hero-details {
    margin-top: 2rem;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 1rem 0;
    text-decoration: none;
    color: var(--text-color);
}

    .nav-item:last-child {
        border-bottom: none;
    }

    .nav-item:hover, .nav-item:hover .nav-number {
        color: var(--main-color);
    }

.nav-number {
    background: var(--stt-bg);
    color: var(--text-color);
    font-size: 1.5rem;
    padding: 0.4rem 0.6rem;
    border-radius: 8px;
    margin-right: 2rem;
    min-width: 50px;
    text-align: center;
}

.nav-item .nav-text {
    flex: 1;
    font-size: 2.5rem
}

.nav-arrow {
    color: var(--text-gray);
    font-size: 1.2rem;
}

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 3rem;
    background: var(--cate-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.bg-hero {
    position: absolute;
    width: 100%;
    top: 0
}

    .bg-hero .bg-1 {
        position: absolute;
        left: 0;
        top: 0;
        mix-blend-mode: color-dodge;
    }

    .bg-hero .bg-2, .bg-hero .bg-3 {
        position: absolute;
        top: 0;
        right: 0
    }

    .bg-hero .bg-2 {
        mix-blend-mode: color-dodge;
    }

    .bg-hero .bg-3 {
        mix-blend-mode: lighten;
    }

    .bg-hero .bg-4 {
        position: absolute;
        top: 0;
        left: 0;
        mix-blend-mode: lighten;
    }


.member-section {
    padding: 4rem 0;
}

.member-grid {
    display: flex;
    gap: 40px;
    justify-content: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

    .member-grid.w-75 {
        width: 75%;
        margin: 0 auto 3rem auto
    }

        .member-grid.w-75 .member-card {
            width: calc((100% - 80px)/3)
        }

.member-card {
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    width: calc((100% - 120px)/4);
    margin-bottom: 20px;
    cursor: pointer
}

    .member-card .imgc {
        margin: 15px
    }

        .member-card .imgc:before {
            padding-bottom: 150%
        }

        .member-card .imgc:after {
            content: "";
            display: block;
            width: calc(100% + 30px);
            height: calc(100% + 30px);
            position: absolute;
            left: -15px;
            top: -15px;
            background: url(images/top_img.png) no-repeat left top, url(images/bot_img.png) no-repeat right bottom;
            background-size: 100% auto, auto 60%
        }

.member-name {
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--main-color);
    font-size: 18px;
}

.member-title {
    font-size: 15px;
    line-height: 1.5;
}

.discussion-section {
    padding: 4rem 0;
}

.discussion-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 4rem;
}

.discussion-item {
    padding: 30px 0;
    border-bottom: 1px solid white;
}

.discussion-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.discussion-icon {
    width: 40px;
    height: 40px;
    background: url(images/document.svg) no-repeat center;
    flex: 0 0 40px
}

.discussion-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-color);
    line-height: 1.5;
    margin-bottom: 0
}

    .discussion-content h3 a {
        text-decoration: none;
        color: var(--text-color)
    }

        .discussion-content h3 a:hover {
            color: var(--main-color)
        }

.discussion-author {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

    .discussion-author .imgc {
        width: 40px;
        border-radius: 50%;
        overflow: hidden
    }

        .discussion-author .imgc:before {
            padding-bottom: 100%
        }

.author-info {
    flex: 1;
    font-size: 18px
}

.author-name {
    color: var(--main-color);
    font-size: 18px;
    margin-right: 15px
}

.download-link {
    color: var(--main-color);
    display: inline-block;
    padding-right: 25px;
    background: url(images/download.svg) no-repeat right bottom 8px;
    text-decoration: none
}

    .download-link:hover {
        color: var(--text-color);
    }

.news-section {
    padding: 4rem 0;
}

.news-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 2rem;
}

    .news-grid .news-card:nth-child(1), .news-grid .news-card:nth-child(2) {
        grid-column: span 2
    }

        .news-grid .news-card:nth-child(1) .news-title a, .news-grid .news-card:nth-child(2) .news-title a {
            font-size: 24px
        }

.news-title a {
    color: var(--text-color);
    font-weight: 700;
    margin: 20px 0;
    font-size: 18px;
    line-height: 1.4;
    display: block;
    text-decoration: none
}

    .news-title a:hover {
        color: var(--main-color)
    }

.news-excerpt {
    color: var(--text-gray);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.video-container {
    width: calc(100% - 20px);
    max-width: 1920px;
    margin: auto
}

.video-section {
    padding: 4rem 0;
    margin-bottom: 70px
}

.video-slide .slick-list {
    width: calc(100% + 10px);
    margin-left: -5px;
    overflow: hidden
}

.video-slide .imgc {
    margin: 0 5px
}
    .video-slide .imgc:before {padding-bottom: 56.25%}

    .video-slide .imgc.type_video {
        background-color: #000
    }

        .video-slide .imgc.type_video:after {
            content: "";
            border-left: 60px solid white;
            border-top: 30px solid transparent;
            border-bottom: 30px solid transparent;
            opacity: 0.8;
            position: absolute;
            z-index: 3;
            left: calc(50% - 20px);
            top: calc(50% - 30px)
        }

        .video-slide .imgc.type_video:hover:after {
            opacity: 1
        }
.video-slide .slick-track {margin: auto}

.footer {
    padding: 20px 0;
    background-color: var(--footer-bg)
}

    .footer .content {
        text-align: right
    }

.footer-container {
    width: calc(100% - 200px);
    max-width: 1480px;
    margin: 0 auto
}

.slick-arrow {
    width: 60px;
    height: 40px;
    border-radius: 20px;
    background-color: var(--bg-button);
    border: none;
    outline: none;
    text-align: center;
    position: absolute;
    left: 10px;
    top: calc(50% - 20px);
    z-index: 3
}

    .slick-arrow.slick-next {
        left: auto;
        right: 10px
    }

    .slick-arrow.slick-disabled {
        opacity: 0.5
    }

    .slick-arrow:after {
        content: "❮";
        color: white;
        font-size: 20px
    }

    .slick-arrow.slick-next:after {
        content: "❯"
    }

.btn_top {
    position: fixed;
    right: 10px;
    bottom: 100px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    background-color: #fb0505;
    justify-content: center
}

#myModal #content-expert {
    background: var(--bg-popup);
    padding: 30px;
    flex-direction: row;
    gap: 40px;
    color: #000;
    display: flex
}

#myModal .modal-content .imgc {
    width: 250px;
    flex: 0 0 250px
}

    #myModal .modal-content .imgc:before {
        padding-bottom: 150%
    }

#myModal .modal-content .title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px
}

#myModal .modal-content .content {
    font-size: 16px;
    line-height: 1.5;
    max-height: 320px;
    overflow: auto
}

#myModal.modal .modal-dialog {
    top: calc(50% - 250px);
    max-width: 900px
}

.modal:before {
    content: "";
    display: block;
    width: 40px;
    height: 40px;
    border: 1px solid white;
    background: white url(images/close.svg) no-repeat center;
    position: absolute;
    top: 10px;
    right: 10px
}

.hp-list {
    overflow: hidden;
    padding-bottom: 50px;
}

    .hp-list .slick-list {
        overflow: hidden
    }

    .hp-list .year {
        position: absolute;
        top: 0;
        left: 0;
        width: 120px;
        background: linear-gradient(180deg, #18F2BF 0%, #082F21 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        font-size: 100px;
        font-weight: 700;
        word-break: break-all;
        line-height: 95px
    }

    .hp-list .slick-slide > div {
        overflow: hidden;
        display: flex;
        gap: 30px
    }
        .hp-list .slick-slide > div:first-child {margin-bottom: 30px}

        .hp-list .hp-item {
            position: relative;padding: 0 2px
        }

    .hp-list .imgc {
        margin: 30px 20px 20px 100px
    }

        .hp-list .imgc:after {
            content: "";
            display: block;
            position: absolute;
            width: calc(100% + 40px);
            height: calc(100% + 40px);
            left: -20px;
            top: -20px;
            background: url(images/top_img.png) no-repeat top left, url(images/bot_img.png) no-repeat right bottom;
            background-size: 100% auto, auto 95%
        }

    .hp-list .hp-title {
        text-decoration: none;
        font-size: 18px;
        color: var(--main-color);
        font-weight: bold;
        display: block;
        line-height: 1.5
    }

        .hp-list .hp-title:hover {
            color: white
        }

    .hp-list .slick-arrow {
        top: auto;
        bottom: 0;
        left: 0
    }

    .hp-list .slick-next {
        right: auto;
        left: 80px
    }

.homepage:not(.footer) {
    overflow: hidden;
    position: relative;
    min-height: calc(100vh - 100px);
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box
}

.homepage .hero-section {
    padding: 30px 0
}

    .homepage .hero-section .hero-container {
        padding-bottom: 0;
        border-bottom: none;
        max-width: 1750px
    }

.footer.homepage {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    z-index: 3
}