/* years.css */
@font-face {
    font-family: 'Sans-bold';
    src: url('./fonts/SourceHanSansCN-Bold.ttf') format('truetype');
    font-display: swap;
}

@font-face {
    font-family: 'Sans-normal';
    src: url('./fonts/SourceHanSansCN-Normal.ttf') format('truetype');
    font-display: swap;
}

@font-face {
    font-family: 'CustomFont';
    src: url('./fonts/江城律动宋.ttf') format('truetype');
    font-display: swap;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
.jumbotron {
    margin-left: -70px;
    margin-right: -70px;
    padding-top: 10px;
    padding-bottom: 0px;
    margin-bottom: 0px;
    color: inherit;
    background-color: #eeeeee00;
}
.jumbotron h1{
    text-align: center;
    padding: 3rem 1rem 2.5rem;
    font-family: 'Sans-bold', sans-serif;
    font-size: 36px;
    color: #000000;
    border-bottom: 2px solid #000;
    margin: 0 2rem;
}


.breadcrumb {
    padding: 15px 15px;
    font-family: 'Sans-bold', sans-serif;
    margin-bottom: 0px;
    font-size: 14px;
    background: white;
}

.breadcrumb a {
    color: #000000;
    text-decoration: none;
    transition: color 0.2s;
}

.breadcrumb a:hover {
    color: #0066cc;
    text-decoration: underline;
}

ul.nav-tabs li.active a, ul.nav-tabs li.active a:hover{
    background: #e3f2fd;       
    border-left: 4px solid transparent;
    border-left-color: #2196f3;
    color: #1976d2;
    border-radius: 4px;
}
/* Custom Styles */
ul.nav-tabs{
    width: 200px;
    margin-top: 10px;
    border-radius: 4px;
    /* border: 1px solid #ddd; */
    /* box-shadow: 0 1px 4px rgba(0, 0, 0, 0.067); */
}
ul.nav-tabs li{
    margin: 0;
    /* border-top: 1px solid #ddd; */
}
ul.nav-tabs li:first-child{
    border-top: none;
}

ul.nav-tabs li a{
font-family: 'Sans-bold';
color: #000000;
font-size: 20px;
margin: 0;
padding: 8px 16px;
border-radius: 0;
border-bottom: #66666693 1px solid;    
border-left: 4px solid transparent;
}
ul.nav-tabs li:first-child a{
    border-radius: 4px 4px 0 0;
}
ul.nav-tabs li:last-child a{
    border-radius: 0 0 4px 4px;
}
ul.nav-tabs.affix{
    top: 30px; /* Set the top position of pinned element */
}
.col-xs-3 {
    width: 30%;
    position: relative;
    float: left;
    min-height: 1px;
    padding-right: 0px;
    padding-left: 60px;
    margin-right: 0px;
    border-bottom: #66666600 0px solid; 
}
.col-xs-9 {
    width: 70%;
    float: left;
    position: relative;
    min-height: 1px;
    padding-right: 60px;
    padding-left: 15px;
}
.col-xs-9 h2 {
    font-family: 'Sans-bold', sans-serif;
    font-size: 20px;
    color: #000000;
    margin-top: 30px;
    margin-bottom: 10px;
    padding-bottom: 0rem;
}
.right-text {
    font-family: 'Sans-normal', sans-serif;
    padding-right: 20px;
    font-size: 16px;
    line-height: 1.8;
    color: #000000;
    text-indent: 2em;
    text-align: justify;
    hyphens: auto;
    margin-bottom: 1rem;
}

/* 优化后的图片布局系统 */
.img-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 500px), 1fr));
    gap: 2rem;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

/* 单图模式 */
.img-group:has(> :only-child) {
    display: inline-block;
    /* display: flex; */
    justify-content: center;
    text-align: center;
    flex-wrap: wrap;
}
.img-group:has(> :only-child) .right-image {
    width: 60%;
    max-width: none;
    margin: 0 auto;
}
.img-group:has(> :only-child) .image-caption {
    display: inline-block;

    font-family: 'Sans-normal', sans-serif;
    font-size: 14px;
    color: #000000;
    text-align: center;
    width: 60%;
    margin-top: 0.5rem;
    margin-bottom: 0;
    padding: 0;
}

/* 双图模式 */
.img-group:has(> *:nth-child(2):last-child) {
    grid-template-columns: repeat(2, 1fr);
}
.img-group:has(> *:nth-child(2):last-child) .right-image {
    width: 100% !important;
    height: auto;
}

/* 图片标题统一样式 */
.image-caption {
    font-family: 'Sans-normal', sans-serif;
    font-size: 1.4rem;
    color: #000000;
    text-align: center;
    width: 100%;
    margin-top: 1rem;
    padding: 0 1rem;
}
.right-image {
    height: auto;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    background: #fff;
    padding: 0.5rem;
}
.right-image:hover {
    transform: translateY(-3px);
}

/* 底部导航栏样式 */
.bottom-nav {
    position: relative;
    bottom: 0;
    width: 100%;
    background: #e3f2fd;
    display: flex;
    justify-content: space-around;
    border-top: 1px solid #cfd8dc;
    z-index: 5;
    /* border-radius: 12px; */

}
.bottom-nav a {
    font-family: 'CustomFont', sans-serif;
    font-size: 10rem;
    color: #000000;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s;
}
.year-title-container {
    text-align: center;
    z-index: 4;
    transition: all 0.3s ease;
    /* 新增控制边距的部分 */
    width: 100%;
    /* 控制左右边距总和为40px */
    max-width: calc(100% ); 
    padding: 0px; /* 控制文字与容器边缘间距 */
    box-sizing: border-box; /* 防止padding影响容器尺寸 */
}
.year {
    margin-top: 5px;
    font-family: 'CustomFont', sans-serif;
    font-size: 18px;
    color:#000000;
    font-weight: bold;
    line-height: 35px;
    transition: opacity 0.3s ease;
}
.subtitle {
    font-family: 'CustomFont', sans-serif;
    font-size: 12px;
    color: #000000;
    margin-top: -5px;
    text-align: center;
    line-height: 1.2;
    transition: opacity 0.3s ease;
    margin-bottom: 10px;
}
.bottom-nav a:hover {
    background: #bbdefb;
    color: #1565c0;
}