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

a {
    text-decoration: none;
}

body {
    font-family: Arial, sans-serif;
    color: #333;
    min-height: 100vh;
    min-width: 1200px;
}

.container {
    max-width: 1082px;
    margin: 0 auto;
    padding: 0 15px;
}

.header {
    background: #fff;
    width: 100%;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 75px;
}

.logo {
    color: #1766c2;
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 0.5px;
    font-family: "Arial", sans-serif;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    height: 75px;
    padding: 0;
}

.nav-item {
    padding: 0; /* 移除不一致的内边距 */
    min-width: 172px; /* 所有项目都使用相同的宽度 */
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 8px solid transparent;
    transition: border-color 0.3s; /* 添加过渡效果 */
}

.nav-item.active {
    /* 只改变颜色，不改变尺寸 */
    border-bottom: 8px solid #0071CE;
}

.nav-link {
    text-decoration: none;
    font-size: 20px;
    padding: 8px 0;
    width: 100%;
    height: 100%;
    color: #221815;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lang-btn {
    color: #fff;
    width: 94px;
    height: 34px;
    border: none;
    background: linear-gradient(-5deg, #4ba7fa 0%, #7bc7fb 98%);
    border-radius: 17px;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

main {
    /* padding-top: 64px; */
}

.section {
    padding: 60px 0;
}

.text-center {
    text-align: center;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background: #00b7ff;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn:hover {
    background: #0099ff;
}

/* Hero Section Styles */
.hero-section {
    background: #000;
    position: relative;
    width: 1082px;
    margin: 0 auto;
    height: 451px;
    background: url('../static/img/banner.png') no-repeat center center;
    background-size: cover;
}

.hero-section-inner {
    width: 1082px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    display: flex;
    height: 451px;
}

.hero-section-content {
    flex: 1;
    color: #fff;
    padding-left: 71px;
}

.hero-section-subtitle {
    padding-top: 120px;
    font-size: 22px;
    font-weight: 400;
    margin-bottom: 8px;
    line-height: 1.2;
}

.hero-section-title {
    font-size: 50px;
    font-weight: 700;
    color: #11F1FF;
    line-height: 1.1;
    margin-bottom: 47px;
}

.hero-section-btn {
    display: inline-block;
    background: #11F1FF;
    color: #000;
    font-size: 20px;
    font-weight: 400;
    border-radius: 32px;
    padding: 16px 19px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.hero-section-image {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

.hero-section-image img {
    max-width: 520px;
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
}

/* Info Cards Section */
.info-cards-section {
    width: 1082px;
    margin: 40px auto 0 auto;
    display: flex;
    justify-content: space-between;
    gap: 30px;
}

.info-card {
    width: 341px;
    height: 297px;
    border-radius: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.10);
    background: transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: visible;
}

.info-card-top {
    width: 100%;
    height: 120px;
    border-radius: 24px 24px 0 0;;
    display: flex;
    /* align-items: flex-end; */
    justify-content: center;
    position: relative;
    padding: 20px 24px 16px 24px;
    box-sizing: border-box;
    background: url('../static/img/info-card-1.png') no-repeat top center;
    background-size: cover;
}

.card-2 {
    background: url('../static/img/info-card-2.png') no-repeat top center;
}

.card-2 .info-card-title {
    margin-right: 36px;
}

.card-3 {
    background: url('../static/img/info-card-3.png') no-repeat top center;
}

.info-card-title {
    color: #fff;
    font-size: 30px;
    font-weight: 400;
    line-height: 1.2;
    z-index: 1;
}

.info-card-content {
    flex: 1;
    width: 100%;
    background: linear-gradient(0deg, #FFFFFF 0%, #DFEAFF 100%);
    box-shadow: 0px 11px 17px 1px rgba(225, 225, 225, 0.24);
    border-radius: 16px;
    margin-top: -20px;
    border: 2px solid #FFFFFF;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    padding: 40px 18px 0px 18px;
    font-size: 17px;
    color: #3E3A39;
    text-align: center;
    display: flex;
    justify-content: center;
    z-index: 1;
    line-height: 24px;
}

/* Popular Datasets Section */
.container-common {
    display: flex;
    justify-content: flex-start;
    align-self: center;
    width: 1094px;
    box-sizing: border-box;
    /* margin-top: 40px; */
}

.mask-common {
    width: 277px;
    height: 134px;
    border: 2px solid #0071cd;
    border-radius: 10px;
    box-sizing: border-box;
}

.overlayer-common {
    width: 277px;
    height: 134px;
    border: 2px solid #0071cd;
    border-radius: 10px;
    box-sizing: border-box;
}

.datasets-section {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    width: 100%;
    background-color: #ffffff;
    box-sizing: border-box;
    margin-top: 100px;
}

.popular-datasets {
    align-self: center;
    width: 410px;
    height: 76px;
    font-size: 45px;
    color: #000000;
    text-align: center;
    background: url(./img/title1.png) no-repeat top left;
    background-size: cover;
}

.zh .popular-datasets {
    width: 275px;
    height: 76px;
    background: url(./img/title-zh1.png) no-repeat top left;
    background-size: cover;
}

.group {
    position: relative;
    display: flex;
    justify-content: flex-start;
    align-self: flex-start;
    width: 100%;
    margin-top: 46px;
    box-sizing: border-box;
}

.primary {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-self: flex-start;
    width: 100%;
    /* height: 983px; */
    padding: 69px 12px 79px;
    background-image: url(./datasets/img_0.png);
    background-size: 100% 100%;
    box-sizing: border-box;
    background-repeat: no-repeat;
    background-position: 0px 0px;
    background-origin: padding-box;
}

.wrapper {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-self: center;
    padding-bottom: 27px;
    margin-left: 15px;
    box-sizing: border-box;
}

.info {
    max-width: 483px;
    margin-left: 4px;
    font-size: 30px;
    color: #0071ce;
    text-align: left;
}

.title {
    font-size: 52px;
    color: #0071ce;
    text-align: left;
    display: flex;
    align-items: flex-end;
}

.title-hint {
    font-size: 15px;
    font-weight: 300;
    color: #3e3a39;
    padding-bottom: 10px;
}

.content-coverage {
    margin-top: 41px;
    font-size: 17px;
    color: #3e3a39;
}

.article {
    width: 491px;
    margin-top: 9px;
    font-size: 17px;
    line-height: 25px;
    color: #3e3a39;
}

.vertical-line {
    align-self: center;
    width: 1px;
    margin-left: 20px;
}

.wrapper-1 {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-self: center;
    padding-bottom: 6px;
    margin-left: 63px;
    box-sizing: border-box;
}


.container-1 {
    margin-top: 13px;
}

.divider {
    align-self: center;
    width: 511px;
    height: 1px;
    margin-left: 18px;
}

.divider-1 {
    align-self: center;
    width: 526px;
    height: 1px;
    margin-left: 34px;
}

.container-2 {
    margin-top: 18px;
}

.wrapper-2 {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-self: center;
    padding-bottom: 2px;
    margin-left: 14px;
    box-sizing: border-box;
}


.vertical-line-1 {
    align-self: center;
    width: 1px;
    height: 320px;
    margin-left: 42px;
}

.wrapper-3 {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-self: center;
    padding-bottom: 7px;
    margin-left: 61px;
    box-sizing: border-box;
}


.caption-1 {
    width: 310px;
    height: 47px;
    font-size: 28px;
    line-height: 24px;
    color: #0071ce;
    text-align: left;
    white-space: normal;
}


.container-3 {
    margin-top: 29px;
}

.wrapper-4 {
    position: relative;
    display: flex;
    justify-content: flex-start;
    align-self: flex-start;
    width: 277px;
    height: 134px;
    margin-left: 18px;
    box-sizing: border-box;
}

.mask {
    position: absolute;
    left: 50%;
    bottom: -10px;
    z-index: 1;
    background-color: rgba(0, 113, 205, 1);
    transform: translateX(-50%);
}

.group-4 {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-self: flex-start;
    z-index: 2;
    padding: 45px 12px 39px;
    background-color: rgba(245, 247, 253, 1);
}

.icon {
    position: absolute;
    left: 7px;
    top: 10px;
    width: 25px;
    height: 30px;
}

.icon-1 {
    position: absolute;
    top: 10px;
    right: 8px;
    width: 26px;
    height: 28px;
}

.email-prev {
    align-self: center;
    max-width: 251px;
    margin-left: 1px;
    font-size: 20px;
    color: #0071ce;
    text-align: center;
}

.email {
    align-self: center;
    max-width: 249px;
    margin: 16px 2px 0 0;
    font-size: 20px;
    color: #3e3a39;
    text-align: center;
}

.purchase-inquiry-wrapper {
    display: flex;
    justify-content: center;
    align-self: flex-start;
    width: 351px;
    height: 68px;
    margin: 51px 0 0 77px;
    background-image: url(./datasets/img_7.png);
    background-size: 100% 100%;
    box-sizing: border-box;
    background-repeat: no-repeat;
    background-position: 0px 0px;
    background-origin: padding-box;
}

.purchase-inquiry {
    width: 100%;
    margin-left: 3px;
    font-size: 30px;
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
}

.wrapper-5 {
    position: relative;
    display: flex;
    justify-content: flex-start;
    align-self: flex-start;
    width: 277px;
    height: 134px;
    margin-left: 87px;
    box-sizing: border-box;
}

.overlayer {
    position: absolute;
    left: 50%;
    bottom: -10px;
    z-index: 1;
    background-color: rgba(0, 113, 205, 1);
    transform: translateX(-50%);
}

.group-5 {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-self: flex-start;
    z-index: 2;
    padding: 45px 12px 39px;
    background-color: rgba(245, 247, 253, 1);
}

.icon-2 {
    position: absolute;
    left: 8px;
    top: 10px;
    width: 25px;
    height: 30px;
}

.icon-3 {
    position: absolute;
    top: 10px;
    right: 7px;
    width: 26px;
    height: 28px;
}

.badge {
    position: absolute;
    left: 50%;
    top: -6px;
    width: 47px;
    height: 23px;
    transform: translateX(-50%);
}

/* introduction */
.introduction {
    width: 1070px;
    margin: 0 auto;
}

.introduction-title {
    display: block;
    width: 533px;
    height: 76px;
    text-align: center;
    font-size: 45px;
    color: #000000;
    text-align: center;
    margin: 60px auto 32px;
    background: url(./img/title2.png) no-repeat top left;
    background-size: cover;
}

.zh .introduction-title {
    width: 275px;
    height: 76px;
    background: url(./img/title-zh2.png) no-repeat top left;
    background-size: cover;
}

.Business .introduction-title {
    width: 635px;
    background: url(./img/title3.png) no-repeat top left;
    background-size: cover;
}

.zh .Business .introduction-title {
    width: 336px;
    background: url(./img/title-zh3.png) no-repeat top left;
    background-size: cover;
}

.contact .introduction-title {
    width: 228px;
    height: 76px;
    background: url(./img/title4.png) no-repeat top left;
    background-size: cover;
}

.zh .contact .introduction-title {
    width: 266px;
    height: 76px;
    background: url(./img/title-zh4.png) no-repeat top left;
    background-size: cover;
}

.introduction-content {
    display: flex;
    font-size: 17px;
    color: #3e3a39;
    line-height: 30px;
    padding: 0 20px;
}

.introduction-content img {
    margin-right: 50px;
}

.introduction .intro-more {
    width: 1070px;
    height: 68px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 27px auto 60px;
    background: url('./intro/btn-bg.png') no-repeat center center;
    background-size: cover;
}

.introduction .Business-btn {
    background: url('./intro/btn-bg2.png') no-repeat center center;
    background-size: cover;
}

.introduction .intro-more a {
    color: #ffffff;
    font-size: 30px;
    text-decoration: none;
    padding: 20px 40px;
    border-radius: 34px;
    background-color: transparent;
}

.contact {
    text-align: center;
    margin-top: 54px;
    padding-bottom: 89px;
    color: #3e3a39;
    font-size: 20px;
}

.contact .hint {
    display: inline-block;
    color: #0071ce;
    font-size: 30px;
    text-decoration: none;
    margin-top: 54px;
}

.contact-line {
    width: 30px;
    height: 3px;
    background-color: #3e3a39;
    margin: 30px auto;
}

.contact img {
    width: 100%;
}

.contact .address {
    margin: 30px auto;
}

/* ========zh */
.zh-active {
    padding: 11px 23px;
    font-weight: bold;
}

@font-face {
    font-family: 'SourceHanSerifCN';
    src: url('../static/fonts/NotoSerifSC-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'SourceHanSerifCN';
    src: url('../static/fonts/NotoSerifSC-Medium.ttf') format('truetype');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'SourceHanSerifCN';
    src: url('../static/fonts/NotoSerifSC-Bold.ttf') format('truetype');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

/* 应用字体到中文内容 */
.zh {
    font-family: 'SourceHanSerifCN',
    'PingFang SC',
    serif;
}

.zh .info-card-content {
    font-size: 16px;
}

.zh .intro-text {
    text-indent: 2em;
    line-height: 36px;
    display: flex;
    align-items: center;
}

.zh .introduction-content img {
    width: 413px;
    height: 186px;
}

.zh .logo img {
    width: 215px;
}

.zh .info-card-top {
    padding-top: 35px;
}