/* 默认（英文） */
body {
  font-family:
    "Poppins",
    "Hiragino Mincho ProN",
    "Yu Mincho",
    sans-serif;
    letter-spacing: 0.03em;
    margin: 0;
    padding: 0;
}
/* 26.4.13 更新 日文版文字间距拉开 */
/* html[lang="ja"] .text-box h1 {
  font-family: "IBM Plex Sans JP", serif;
  letter-spacing: 0.1em;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}*/

html[lang="ja"] nav, 
html[lang="ja"] .sub-header {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  letter-spacing: 0.15em;
}

/* 
html[lang="ja"] body {
  font-family: "Hiragino Kaku Gothic Pro", "Yu Gothic", sans-serif;
  letter-spacing: 0.05em;
} */



*, *::before, *::after {
  box-sizing: border-box;
}


/* 26.2.28更新 跳转的时候添加滚动效果 */
html {
    scroll-behavior: smooth;
    transition: 1s;
}

.header {
    min-height: 100vh;
    width: 100%;
    background-image: linear-gradient(rgba(4, 9, 30, 0.7), rgba(4, 9, 30, 0.7)), url(../images/background.jpg);
    background-position: center;
    background-size: cover;
    position: relative;
}
.logo {
    width: 7vw;
}
nav{
    display: flex;
    padding: 2% 6%;
    justify-content: space-between;
    align-items: center;
}

nav img {
    width: 75px;
}

.nav-links {
    flex: 1;
    text-align: right;
}

.nav-links ul li{
    list-style: none;
    display: inline-block;
    padding: 8px 12px;
    position: relative;
}

.nav-links ul li a {
    color: #fff;
    text-decoration: none;
    font-size: 13px;
}

.nav-links ul li::after {
    content: '';
    width: 0%;
    height: 2px;
    background: #553CE2;
    display: block;
    margin: auto;
    transition: 0.5s;
}

.nav-links ul li:hover::after {
    width: 100%;
}

.text-box{
    width: 90%;
    color: #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.text-box h1 {
    font-size: 62px;
}

.text-box p {
    margin: 10px 0 40px;
    font-size: 14px;
}

.hero-btn {
    display: inline-block;
    text-decoration: none;
    color: #fff; 
    border: 1px solid #fff;
    margin-top: 3%;
    padding: 12px 34px;
    font-size: 13px;
    background: transparent;
    position: relative;
    cursor: pointer;
}

.hero-btn:hover {
    border: 1px solid #553CE2;
    background: #553CE2;
    transition: 1s;
}

nav .fa {
    display: none;
}

@media(max-width: 700px) {
    /* 新增overflow-x, 防止off-canvas撑宽页面 */
    /* 需要 header 里 position: relative */
    html, body {
        overflow-x: hidden;
    }

    h1 {
        font-size: 30px;
    }
    .text-box h1 {
        font-size: 30px;
    }

    .nav-links ul li {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        background: #553CE2;
        height: 100vh;
        width: 200px;
        top: 0;
        right: -200px;
        text-align: left;
        z-index: 2;
        transition: 0.75s;
    }

    nav .fa {
        display: block;
        color: #fff;
        margin: 10px;
        font-size: 22px;
        cursor: pointer;
    }

    .nav-links ul {
        padding: 30px;
    }
}



/* ---------------- switch language ---------------- */


.lang-switch {
  font-size: 13px;
  color: #fff;
  letter-spacing: 0.08em;
}

.lang-switch a {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  transition: 0.2s;
}

.lang-switch a.active {
  color: #fff;
  font-weight: 600;
}

.lang-switch a:hover {
  color: #fff;
}



/* ---------------- research topics ---------------- */

.home-course {
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}

/* 260419 home和research共用row  */
.row {
    margin-top: 5%;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.home-course-col {
    display: flex;
    flex-basis: 47%;
    background: #f4f2fa;
    border-radius: 10px;
    margin-bottom: 5%;
    padding: 20px 12px;
    transition: 0.5s;

    align-items: center; 
}

.col-intro h3 {
    text-align: center;
    font-weight: 600;
    margin: 10px 0;
}

.col-intro p {
    color: #777;
    font-size: 14px;
    font-weight: 300;
    line-height: 20px;
    
    text-align: left;
    padding: 10px;
    margin: 10px 10px;
}

.home-course-col:hover {
    box-shadow: 0 0 20px 0px rgba(0, 0, 0, 0.2);
}

/* 260419 追加各个研究内容card的说明图 */
/* 260419 home和research共用img-box */
.img-box { 
    flex: 0 0 200px;   /* ⭐固定尺寸（核心） */
    /* aspect-ratio: 1 / 1; */
    overflow: hidden;
    border-radius: 8px;
}

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

@media (max-width: 700px){
    .row {
        flex-direction: column;
    }
}


/* ---------------- professor ---------------- */

.boss {
  width: 80%;
  margin: auto;
  text-align: center;
  padding-top: 80px;
  padding-bottom: 60px;
}

/* 标题在 index html 中被删除 */
.boss h1 {
  margin-bottom: 40px;
}

.boss p {
  color: #777;
  font-size: 16px;
  line-height: 1.6;
}

/* 卡片主体：跟你 Courses 那种圆角淡色块一致 */
.boss-card {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  background: #f4f2fa; /* 你截图里那种淡紫感 */
  border-radius: 14px;
  padding: 30px;

  display: flex;
  /* 新增：纵向结构排列 */
  flex-direction: column;   /* 关键 */
  gap: 28px;
  align-items: center;
  text-align: left;
}

/* 新增 boss-main 负责内部图片和介绍的左右排列 */
.boss-main {
  display: flex;
  gap: 28px;
  align-items: center;
}

/* 左边头像 */
.boss-left img {
  width: 180px;
  height: 180px;
  border-radius: 14px;
  object-fit: cover;
  display: block;
}

/* 右边文字 */

/* 允许占满剩余空间（不是很懂虽然说... */
.boss-right {
  flex: 1;
}

.boss-right h2 {
  font-size: 26px;
  margin: 0 0 6px;
}

.name .kana {
  font-size: 0.8em; 
  font-weight: 600;       /* 👈 关键：相对缩小 */
  color: #666;  /* 稍微变浅 */
  margin: 0 0 6px 8px;
  letter-spacing: 0.05em;
}

.boss-right h3 {
  font-size: 14px;
  font-weight: 500;
  /* 新加 text-align 靠左显示 */
  /* text-align: left; */
  color: #666;
  margin: 0 0 16px;
}

.boss-bio {
  color: #555;
  line-height: 1.8;
  /* margin: 0 0 18px; */
}

/* 研究方向标签 */
.boss-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  /* margin-bottom: 10px; */
}

.boss-tags span {
  font-family:
    "Poppins",
    "Hiragino Kaku Gothic ProN",
    "Yu Gothic",
    sans-serif;

  background: rgba(0, 0, 0, 0.06);
  padding: 8px 20px;
  border-radius: 999px;
  font-size: 13px;
  color: #444;
}


/* 新版：外链样式 */
.boss-actions {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.boss-actions a {
    font-size: 15px;
    font-weight: 600;
}

 
/* 响应式：手机上改成上下布局 */
@media (max-width: 700px) {
    .boss-right {
        text-align: center;
    }
  
    .boss-main {
        flex-direction: column;
        text-align: center;
    }

    .boss-actions {
        justify-content: center;
        /* 删去了flex-wrap: wrap (根据文字长度决定按钮大小） */
        gap: 16px;
    }

    .boss-actions a {
        /* 固定按钮宽度 */
        width: 80%;
        text-align: center;
    }

    .boss-left img {
        width: 160px;
        height: 160px;
    }
}


/* ----------------- News & Event -------------------- */

.facilities {
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}

.facilities-col {
    flex-basis: 46%;
    border-radius: 10px;
    margin-bottom: 5%;
    text-align: left;
}

.facilities-col img {
    width: 100%;
    aspect-ratio: 16 / 9;      /* 固定高度 */
    object-fit: cover;    /* 关键！裁切而不拉伸 */
    border-radius: 10px;
}

.facilities-col p {
    padding: 0;
}

.facilities-col h3 {
    margin-top: 16px;
    margin-bottom: 15px;
    text-align: left;
}

/* 未修改 */
@media (max-width: 700px) {
    
}


/* ----------------- footer -------------------- */

.footer {
    margin-top: 50px;
    background: #f4f2fa;
    color: #111;
    padding: 24px 8%;
}

.footer-top {
    margin-top: 0;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
}

.footer-left h4 {
    color: #696969;
    font-size: 20px;
    margin-top: 10px;
}

.footer-right {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 10px 10px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: #777;
    text-decoration: none;
}

.info-item i {
    color: #553CE2;

    /* 以下3行为补充，因为icon大小不一样 */
    width: 18px;          /* 固定图标占位宽度：16~20px都行 */
    text-align: center;   /* 图标在占位区居中 */
    flex: 0 0 18px;       /* 不要被压缩 */
}

.footer-bottom {
    margin-top: 10px;
    padding-top: 20px;
    border-top: 1px solid rgba(0,0,0,0.08);
    text-align: center;
    font-size: 12px;
    color: #777;
}

/* =========================== 通用 =========================== */

.sub-header {
    height: 38vh;
    width: 100%;
    background-image: linear-gradient(rgba(4, 9, 30, 0.7),rgba(4, 9, 30, 0.7)), url(../images/background.jpg);
    background-position: center;
    background-size: cover;
    text-align: center;
    /* 新增 position */
    position: relative;
    color: #fff;
}

.sub-header h1 {
    font-size: 30px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin-top: 3%;
}

.purple-btn {
    border: 1px solid #553CE2;
    background: transparent;
    color: #553CE2;
}

.purple-btn:hover {
    color: #fff;
}


@media(max-width: 700px) {
    .sub-header h1 {
        font-size: 26px;
    }
}



/* ========================= Research Page ========================= */


.course {
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}

.row {
    margin-top: 5%;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.course-col {
    flex-basis: 46%;
    background: #f4f2fa;
    border-radius: 10px;
    margin-bottom: 5%;
    padding: 20px 12px;
    transition: 0.5s;
}

.course-col h3 {
    text-align: center;
    font-weight: 600;
    margin: 10px 0;
}

.course-col p {
    color: #777;
    font-size: 14px;
    font-weight: 300;
    line-height: 20px;
    
    text-align: left;
    padding: 10px;
    margin: 10px 10px;
}

.course-col:hover {
    box-shadow: 0 0 20px 0px rgba(0, 0, 0, 0.2);
}

/* img-box 与home共用 */

@media (max-width: 700px){
    .row {
        flex-direction: column;
    }
}




/* ========================= Theses Page ========================= */

.theses {
  width: 85%;
  margin: auto;
  padding: 80px 0;
}

.theses-section {
  margin-bottom: 80px;
}

.theses-section h2 {
  font-size: 32px;
  margin-bottom: 40px;
  text-align: center;
  font-weight: 700;
}

.theses-section h2 {
  font-size: 26px;
  margin-bottom: 40px;
  text-align: center;
  font-weight: 500;
}

/* 卡片容器 */
.card-container {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

/* 卡片样式 */
.thesis-card {
  width: 100%;
  background: #f4f3ff;
  padding: 28px;
  border-radius: 16px;
  max-width: 800px;
  transition: 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.thesis-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
}

.thesis-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.meta {
  font-size: 14px;
  color: #777;
  margin-bottom: 12px;
}

.desc {
  font-size: 14px;
  color: #555;
  margin-bottom: 18px;
  line-height: 1.6;
}

/* 按钮 */
.link-btn {
  display: inline-block;
  padding: 8px 14px;
  background: #111;
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-size: 13px;
}

.link-btn:hover {
  background: #333;
}

/* 简洁条目（本科/硕士/博士用） */
/* Theses list container */
.thesis-list {
  max-width: 800px;
  margin: 0 auto;
  border-radius: 10px;
  overflow: hidden;
}

/* 每一行 */
.thesis-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  font-size: 15px;
  transition: background 0.2s ease;
}

/* 条纹效果 */
.thesis-row:nth-child(odd) {
  background-color: #fafafa;
}

.thesis-row:nth-child(even) {
  background-color: #f2f2f2;
}

/* hover 效果（暂且不用，不误导用户有链接） */
/* .thesis-row:hover {
  background-color: #eaeaea;
} */

/* 左侧标题 */
.thesis-title {
  font-weight: 500;
  color: #333;
}

/* 右侧年份 */
.thesis-year {
  color: #777;
  font-size: 14px;
}

/* 响应式 */
@media (max-width: 700px) {
  .card-container {
    flex-direction: column;
    align-items: center;
  }
}


/* ========================= Event Page ========================= */

.news {
    width: 85%;
    max-width: 900px;
    margin: 100px auto;
}

.news h1 {
    text-align: center;
    margin-bottom: 50px;
}

.news-item {
    display: flex;
    gap: 40px;
    padding: 35px 0;
    /* border-top: 1px solid #ddd; */
    border-bottom: 1px solid #ddd;
}

.news-img img {
    width: 140px;
    height: 140px;
    object-fit: cover;
    transition: 0.3s;
    margin: 0px 0px 0px 30px;
}

.news-img img:hover {
    transform: scale(1.05);
}

.news-date {
    color: #888;
    font-size: 14px;
}

.news-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.news-content h2 {
    /* margin: 10px 0 15px; */
    font-size: 22px;
}

.news-content h2:hover {
    color: #8c7b5f;
}

.news-content p{
    color: #777;
    font-size: 14px;
    font-weight: 300;
    line-height: 20px;
    padding-top: 10px;
}


@media (max-width: 700px) {
    .news {
        width: 90%;
        margin: 50px auto;
    }

    .news h1 {
        margin-bottom: 30px;
        font-size: 28px;
    }

    .news-item {
        gap: 14px;
        padding: 22px 0;
        align-items: flex-start;
    }

    .news-img img {
        width: 108px;
        height: 81px;
        margin: 0;
        flex-shrink: 0;
    }

    .news-date {
        font-size: 13px;
        display: block;
        margin-bottom: 8px;
        /* 上下を切り替える */
        order: 2;
    }

    .news-content h2 {
        font-size: 18px;
        font-weight: 600;
        line-height: 1.4;
        margin: 0;
        /* 上下を切り替える */
        order: 1;
    }

    /* 让某一块不显示的方法 */
    .news-content p {
        display: none;
    }

}

    


/* ======================= Contact Us Page ======================= */

.location {
    width: 80%;
    margin: 80px auto;
    
    display: flex;
    gap: 60px;
    align-items: flex-start;
}

.map {
    flex: 1;
}

.map iframe {
    width: 100%;
    height: 300px;
    border-radius: 12px;
}

.contact-us{
    flex: 1;
}

.contact-col div {
    display: flex;
    align-items: flex-start;
    margin-bottom: 40px;
}

.contact-col div .fa {
    font-size: 22px;
    color: #553CE2;
    margin-right: 20px;
    margin-top: 5px;
}

.contact-col h5 {
    font-size: 18px;
    margin: 0;
    font-weight: 500;
}

.contact-col p {
    margin: 4px 0 0;
    font-size: 14px;
    color: #666;
}

@media (max-width: 700px) {
    .location {
        flex-direction: column;
    }

    .map iframe {
        height: 300px;
    }
}




/* ======================= Member Page ======================= */

.members-page {
      max-width: 1100px;
      width: 80%;
      margin: 0 auto;
      padding: 100px 24px 80px;
    }
 
.page-header {
      text-align: center;
      margin-bottom: 70px;
    }

    .page-header h1 {
      font-size: 2.5rem;
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: 0.03em;
    }

    .page-header p {
      font-size: 1rem;
      color: #666;
      max-width: 680px;
      margin: 0 auto;
    }


 .member-section {
      margin-bottom: 60px;
    }

    .member-section h2 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 22px;
      padding-bottom: 8px;
      border-bottom: 1px solid #f4f3ff;
      color: #1f2a44;
    }

    .member-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .member-card {
      background: #fff;
      border: 1px solid #f4f3ff;
      border-radius: 14px;
      padding: 16px 18px;
      height: 118px;
      display: flex;
      align-items: center;
      gap: 16px;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .member-card:hover {
      transform: translateY(-3px);
      box-shadow: 0 10px 24px rgba(0, 0, 0, 0.06);
    }

    .member-icon {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: #f4f3ff;
      color: #3b4a6b;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      font-weight: 600;
      flex-shrink: 0;
    }

    .member-info h3 {
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 2px;
      color: #222;
    }

    .member-info .reading {
      font-size: 0.75rem;
      color: #888;
      margin-top: 2px;
      line-height: 1.2;
      letter-spacing: 0.05em;
    }

    .member-info p {
      font-size: 0.95rem;
      line-height: 1.2;
      color: #666;
    }

    @media (max-width: 700px) {
      .member-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 600px) {
      .members-page {
        padding: 80px 16px 60px;
      }

      .page-header {
        margin-bottom: 50px;
      }

      .page-header h1 {
        font-size: 2rem;
      }

      .member-grid {
        grid-template-columns: 1fr;
      }

      .member-card {
        padding: 18px 16px;
      }

      .member-icon {
        width: 46px;
        height: 46px;
        font-size: 0.95rem;
      }
    }