a,
a:hover {
    text-decoration: none
}

body,
button,
dd,
dl,
dt,
form,
h1,
h2,
h3,
h4,
h5,
h6,
input,
li,
ol,
p,
td,
textarea,
th,
ul {
    margin: 0;
    padding: 0
}

body,
button,
input,
select,
textarea {
    font: 12px PingFang SC, \5FAE\8F6F\96C5\9ED1, arial, \5b8b\4f53;
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-size: 100%
}

address,
cite,
dfn,
em,
i,
var {
    font-style: normal
}

kbd,
pre,
samp {
    font-family: courier new, courier, monospace, arial, \5b8b\4f53
}

form {
    display: inline
}

small {
    font-size: 12px
}

ol,
ul {
    list-style: none
}

b {
    font-weight: 400;
    font-weight: inherit
}

a {
    color: #333
}

sup {
    vertical-align: text-top
}

sub {
    vertical-align: text-bottom
}

img {
    vertical-align: top;
    border: 0;
    -ms-interpolation-mode: bicubic
}

button,
input,
select,
textarea {
    font-size: 100%;
    outline: 0
}

table {
    border-collapse: collapse;
    border-spacing: 0
}

textarea {
    resize: none
}

.clearfix {
    *zoom: 1;
}

.clearfix:after {
    content: '\20';
    display: block;
    height: 0;
    clear: both
}

.hidden {
    display: none
}

:-moz-placeholder {
    color: #999
}

::-moz-placeholder {
    color: #999
}

input:-ms-input-placeholder {
    color: #999
}

input::-webkit-input-placeholder {
    color: #999
}

input:-webkit-autofill {
    -webkit-box-shadow: 0 0 0 1000px #fff inset
}

/* Container样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 00px;
    position: relative
}

/* 标题和描述区域外部容器 */
.title-description-section {
    background: #fff;
    margin-bottom: 0;
    padding-top: 40px;
}
.challenge-section{
    background: #F5F5F5;
   
}
/* 页面标题 */
.page-title {
    text-align: center;
    margin-bottom: 40px;
}

.page-title h1 {
    font-size: 48px;
    color: #FF6600;
    margin: 0;
    font-weight: bold;
    text-align: left;
}

.page-title h2 {
    font-size: 24px;
    color: #333;
    margin: 10px 0 0 0;
    font-weight: normal;
    text-align: left;
}

/* 描述文案 */
.description-section {
    margin-bottom: 50px;
    line-height: 1.8;
}

.desc-cn {
    font-size: 16px;
    color: #333;
    margin-bottom: 20px;
    text-align: justify;
}

.desc-en {
    font-size: 14px;
    color: #666;
    text-align: justify;
    font-style: italic;
}

/* 筛选区域 */
.filter-section {
    margin-bottom: 40px;
}

.filter-group {
    margin-bottom: 30px;
}

.filter-group h3 {
    font-size: 16px;
    color: #333;
    margin-bottom: 15px;
    font-weight: bold;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.category-btn {
    padding: 8px 15px;
  
    background: #fff;
    color: #666;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    outline: none;
}

.category-btn:hover {
    border-color: #FF6600;
    color: #FF6600;
}

.category-btn.active {
    background: #FF6600;
    border-color: #FF6600;
    color: #fff;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 40px;
    font-size: 16px;
    color: #666;
}

/* 项目列表 */
.challenge-list {
    margin-top: 30px;
}

.challenge-card {
background: #fff;
    /* border: 1px solid #e0e0e0; */
    border-radius: 16px;
    margin-bottom: 20px;
    padding: 30px;
    /* box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1); */
    /* transition: box-shadow 0.3s ease; */
}

.challenge-card:hover {
  
}

/* 卡片头部 */
.card-header {
    display: flex
    ;
        align-items: center;
        margin-bottom: 20px;
        /* padding-bottom: 15px; */
        /* border-bottom: 2px solid #f0f0f0; */
}

.serial-number {
    background: #FFAC80;
    color: #fff;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex
;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 28px;
    margin-right: 20px;
    flex-shrink: 0;
}

.project-names {
    flex: 1;
}

.name-cn {
    font-size: 20px;
    color: #FF5900;
    margin: 0 0 5px 0;
    font-weight: bold;
}

.name-en {
    font-size: 16px;
    color: #FF5900;
    margin: 0;
    font-weight: normal;
    font-style: italic;
}

/* 标签区域 */
.card-tags {
    margin-bottom: 25px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 500;
   
    color: #666;
    border: 1px solid #e0e0e0;
}

/* 内容区域 */
.card-content {
    line-height: 1.6;
}

.content-section {
    margin-bottom: 20px;
}

.content-section:last-child {
    margin-bottom: 0;
}

.content-section h5 {
    font-size: 14px;
    color: #333;
    margin: 0 0 8px 0;
    font-weight: bold;
}

.text-cn {
    font-size: 14px;
    color: #333;
    margin: 0 0 5px 0;
    text-align: justify;
    line-height: 1.8;
 
}

.text-en {
    font-size: 13px;
    color: #888;
    margin: 0;
    text-align: justify;
    font-style: italic;
    line-height: 1.8;
   
}

.content-section.contact {
    background: #f9f9f9;
    padding: 15px;
    padding: 15px;
   
    border-left: 4px solid #FF6600;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }
    
    .page-title h1 {
        font-size: 32px;
    }
    
    .page-title h2 {
        font-size: 18px;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }
    
    .serial-number {
        margin-bottom: 15px;
        margin-right: 0;
    }
    
    .challenge-card {
        padding: 20px;
    }
    
    .filter-buttons {
        justify-content: center;
    }
    
    .category-btn {
        font-size: 12px;
        padding: 6px 15px;
    }
}