:root {
  --deep-blue: #123A5C;
  --deep-blue-light: #1A4A70;
  --dark-gray: #1A1A1A;
  --mid-gray: #555;
  --light-gray: #F5F5F5;
  --border-gray: #E0E0E0;
  --white: #FFFFFF;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--mid-gray);
  line-height: 1.8;
  background: var(--white);
  overflow-x: hidden;
}

/* ===== 顶部导航栏 ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: background 0.4s ease, box-shadow 0.4s ease;
  background: transparent;
  padding: 0 24px;
}

header.scrolled {
  background: var(--deep-blue);
  box-shadow: 0 2px 12px rgba(0,0,0,0.18);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  padding: 14px 0;
}

.site-title {
  color: var(--white);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-shadow: 0 1px 4px rgba(0,0,0,0.35);
  line-height: 1;
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
}

nav ul li a {
  display: block;
  color: var(--white);
  text-decoration: none;
  padding: 10px 14px;
  font-size: 15px;
  letter-spacing: 0.3px;
  transition: color 0.25s, border-bottom 0.25s;
  border-bottom: 2px solid transparent;
  text-shadow: 0 1px 4px rgba(0,0,0,0.35);
}

nav ul li a:hover {
  border-bottom-color: var(--white);
}

/* ===== 首页封面 + 底部渐变 ===== */
.hero {
  height: 100vh;
  min-height: 600px;
  background: url('1.png') center/cover no-repeat;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 180px;
  background: linear-gradient(to bottom,
    rgba(255,255,255,0) 0%,
    rgba(255,255,255,0.08) 15%,
    rgba(255,255,255,0.25) 35%,
    rgba(255,255,255,0.55) 60%,
    rgba(255,255,255,0.85) 80%,
    rgba(255,255,255,1) 100%);
  pointer-events: none;
}

.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--deep-blue);
  font-size: 26px;
  animation: bounce 2s infinite;
  opacity: 0.75;
  z-index: 2;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-12px); }
  60% { transform: translateX(-50%) translateY(-6px); }
}

/* ===== 大标题板块 ===== */
.big-title-section {
  text-align: center;
  padding: 120px 24px;
}

.big-title-section h1 {
  font-size: 58px;
  font-weight: 900;
  color: var(--deep-blue);
  line-height: 1.3;
  letter-spacing: 0.5px;
  max-width: 1000px;
  margin: 0 auto;
}

/* ===== 内容区通用 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.who-section {
  padding: 80px 0 100px;
}

.who-header {
  text-align: center;
  margin-bottom: 50px;
}

.who-header h2 {
  font-size: 38px;
  color: var(--deep-blue);
  padding-bottom: 14px;
  border-bottom: 3px solid var(--deep-blue);
  display: inline-block;
  letter-spacing: 0.5px;
}

.who-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.who-text p {
  font-size: 16px;
  line-height: 1.9;
  margin-bottom: 20px;
  text-align: justify;
}

/* ===== 右侧三个小板块 ===== */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

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

.feature-item .feature-title {
  display: inline-block;
  background: var(--deep-blue);
  color: var(--white);
  padding: 10px 22px;
  border-radius: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.3px;
  margin-bottom: 18px;
  min-width: 320px;
  text-align: center;
}

.feature-item img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 4px 18px rgba(0,0,0,0.12);
}

/* ===== Join Us 板块 ===== */
.join-section {
  padding: 80px 0 100px;
  background: var(--white);
}

.join-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.join-image img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 4px 18px rgba(0,0,0,0.12);
}

.join-text p {
  font-size: 16px;
  line-height: 1.9;
  margin-bottom: 20px;
  text-align: justify;
}

.join-text a {
  color: var(--deep-blue);
  font-weight: 600;
  text-decoration: none;
}

.join-text a:hover {
  text-decoration: underline;
}

/* ===== 上滑出场动画 ===== */
.slide-up {
  opacity: 0;
  transform: translateY(80px);
  transition: opacity 1s cubic-bezier(0.22, 1, 0.36, 1),
              transform 1s cubic-bezier(0.22, 1, 0.36, 1);
}

.slide-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 左滑出场动画 ===== */
.slide-in {
  opacity: 0;
  transform: translateX(-160px);
  transition: opacity 1.1s cubic-bezier(0.22, 1, 0.36, 1),
              transform 1.1s cubic-bezier(0.22, 1, 0.36, 1);
}

.slide-in.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ===== 页脚 ===== */
footer {
  background: var(--deep-blue);
  color: #B8C7D6;
  text-align: center;
  padding: 40px 24px;
  font-size: 14px;
  line-height: 2;
}

footer a {
  color: #E6EEF5;
  text-decoration: none;
}

/* ===== 二级页面内容区 ===== */
.page-section {
  padding: 160px 0 100px;
  min-height: 60vh;
}

.page-section .who-header h2 {
  font-size: 38px;
  color: var(--deep-blue);
  padding-bottom: 14px;
  border-bottom: 3px solid var(--deep-blue);
  display: inline-block;
  letter-spacing: 0.5px;
}

/* ===== Research 页面 ===== */
.research-hero {
  padding: 220px 0 120px;
  background:
    linear-gradient(to right,
      rgba(26, 74, 112, 0.55) 0%,
      rgba(18, 58, 92, 0) 18%,
      rgba(18, 58, 92, 0) 82%,
      rgba(26, 74, 112, 0.55) 100%),
    var(--deep-blue);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.research-hero .container {
  text-align: center;
}

.research-hero h1 {
  position: relative;
  z-index: 1;
  font-size: 96px;
  font-weight: 900;
  color: #FFFFFF;
  letter-spacing: 5px;
  line-height: 1.1;
  margin-bottom: 26px;
  text-shadow: 0 4px 24px rgba(0,0,0,0.28);
}

.research-hero-sub {
  position: relative;
  z-index: 1;
  max-width: 880px;
  margin: 0 auto;
  font-size: 18px;
  line-height: 1.9;
  color: rgba(255,255,255,0.92);
  letter-spacing: 0.3px;
}

.hero-links {
  position: relative;
  z-index: 1;
  list-style: disc;
  display: inline-block;
  text-align: left;
  margin: 0 auto;
  padding-left: 24px;
  color: rgba(255,255,255,0.92);
  font-size: 17px;
  line-height: 2;
}

.hero-links li {
  margin-bottom: 6px;
}

.hero-links li a {
  color: #FFFFFF;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.4);
  transition: border-bottom-color 0.25s;
}

.hero-links li a:hover {
  border-bottom-color: #FFFFFF;
}

.research-list {
  padding: 120px 0 140px;
  background: var(--white);
}

.research-block {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: 0;
  margin-bottom: 100px;
  position: relative;
}

.research-block:last-child {
  margin-bottom: 0;
}

.research-block .research-block-image {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  z-index: 1;
}

.research-block .research-block-card {
  margin-left: 0;
  z-index: 2;
}

.research-block-image img {
  max-width: 420px;
  height: 620px;
  object-fit: cover;
  border-radius: 0;
  box-shadow: 0 16px 44px rgba(0,0,0,0.18);
  display: block;
  margin-left: auto;
}

.research-block-card.card-fade {
  width: 780px;
  min-height: 620px;
  padding: 54px 50px;
  border-radius: 0;
  margin-left: 0;
  background: linear-gradient(to right,
    #D8DDE3 0%,
    #D8DDE3 68%,
    rgba(216, 221, 227, 0.6) 82%,
    rgba(216, 221, 227, 0.2) 93%,
    rgba(216, 221, 227, 0) 100%);
  box-shadow: none;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

.research-block-card.card-fade h3 {
  font-size: 24px;
  font-weight: 700;
  color: #444;
  margin-bottom: 26px;
  line-height: 1.4;
  white-space: nowrap;
}

.research-block-card.card-fade p {
  font-size: 17px;
  line-height: 1.95;
  color: #444;
  text-align: justify;
  margin-bottom: 30px;
}

.research-block-card.card-fade .cn-title {
  font-size: 21px;
  font-weight: 700;
  color: #444;
  margin-top: 14px;
  margin-bottom: 18px;
  line-height: 1.4;
  text-align: left;
}

.research-block-card.card-fade p.cn {
  font-size: 17px;
  color: #444;
  line-height: 1.95;
  margin-bottom: 0;
}

/* ===== Publications 页面 ===== */
.pub-main {
  padding: 0;
}

.pub-layout {
  display: flex;
  align-items: flex-start;
  gap: 0;
}

.year-side {
  position: sticky;
  top: 100px;
  width: 16.66%;
  min-width: 200px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  flex-shrink: 0;
  margin: 40px 0 40px 40px;
  background: linear-gradient(to left,
    #D8DDE3 0%,
    #E4E8ED 30%,
    #F0F2F5 60%,
    #FFFFFF 100%);
  padding: 30px 0 50px 0;
  border: none;
  box-shadow: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  scrollbar-width: thin;
  scrollbar-color: #B0BEC9 transparent;
}

.year-side::-webkit-scrollbar {
  width: 6px;
}

.year-side::-webkit-scrollbar-track {
  background: transparent;
}

.year-side::-webkit-scrollbar-thumb {
  background: #B0BEC9;
  border-radius: 3px;
}

.year-side::-webkit-scrollbar-thumb:hover {
  background: #8A9AA8;
}

.year-arrow {
  position: absolute;
  left: 14px;
  bottom: 10px;
  font-size: 16px;
  color: var(--deep-blue);
  opacity: 0.55;
  pointer-events: none;
  transition: transform 0.35s ease, opacity 0.35s ease;
}

.year-arrow.up {
  transform: rotate(180deg);
}

.year-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
  width: 100%;
}

.year-btn {
  background: transparent;
  border: none;
  color: var(--deep-blue);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 8px 0;
  cursor: pointer;
  text-align: center;
  transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
  width: 100%;
  opacity: 0.55;
}

.year-btn:hover {
  opacity: 1;
  color: var(--deep-blue);
}

.year-btn.active {
  color: var(--deep-blue);
  font-size: 38px;
  font-weight: 900;
  letter-spacing: 3px;
  opacity: 1;
}

.year-btn.active::after {
  content: "";
  display: block;
  width: 80px;
  height: 2px;
  background: var(--deep-blue);
  margin: 10px auto 0;
}

.pub-content {
  flex: 1;
  min-width: 0;
  padding: 40px 60px 120px 20px;
}

.pub-year-block {
  display: none;
}

.pub-year-block.active {
  display: block;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.pub-heading {
  font-size: 44px;
  font-weight: 900;
  color: var(--deep-blue);
  margin: 0 auto 40px;
  padding-bottom: 6px;
  border-bottom: 3px solid var(--deep-blue);
  display: block;
  width: fit-content;
  letter-spacing: 2px;
  text-align: center;
}

.pub-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.pub-list li {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 50px;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  transform-origin: left center;
}

.pub-list li:hover {
  transform: scale(1.04);
}

.pub-num {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  background: #E8ECF0;
  color: var(--deep-blue);
  font-family: "Helvetica Neue", "PingFang SC", Arial, sans-serif;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0;
  line-height: 1;
  border-radius: 0;
}

.pub-text {
  flex: 1;
  min-width: 0;
  font-size: 16px;
  line-height: 1.85;
  color: #444;
  text-align: justify;
}

.pub-text em {
  color: #000000;
  font-style: italic;
  font-weight: 700;
}

.pub-text a.pub-link {
  color: #0066FF;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid #0066FF;
  transition: color 0.25s, border-bottom-color 0.25s;
}

.pub-text a.pub-link:hover {
  color: #0044CC;
  border-bottom-color: #0044CC;
}

/* ===== Youyong Li 页面 ===== */
.youyong-contact {
  margin-top: 50px;
}

.youyong-contact p {
  font-size: 16px;
  line-height: 1.9;
  color: rgba(255,255,255,0.92);
  margin: 0;
}

.youyong-contact a {
  color: #FFFFFF;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.4);
  transition: border-bottom-color 0.25s;
}

.youyong-contact a:hover {
  border-bottom-color: #FFFFFF;
}

.youyong-main {
  padding: 60px 24px 120px;
}

/* 整体布局 */
.youyong-layout {
  max-width: 1500px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: 90px;
  padding-left: 40px;
  padding-right: 24px;
}

/* 左侧照片 */
.youyong-side {
  position: sticky;
  top: 170px;
  width: 395px;
  flex-shrink: 0;
  isolation: isolate;
}

/* 悬停：左侧蓝色竖线，伸到照片外面 */
.youyong-side::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--deep-blue);
  transition: height 0.45s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: 1;
}

.youyong-side:hover::before {
  height: 100%;
}

/* 右上角 + 左下角灰色渐变，向周围渐白 */
.youyong-side::after {
  content: "";
  position: absolute;
  top: -18px;
  right: -18px;
  bottom: -18px;
  left: -18px;
  background:
    radial-gradient(circle at top right,
      rgba(200, 208, 216, 0.65) 0%,
      rgba(200, 208, 216, 0.35) 18%,
      rgba(200, 208, 216, 0.12) 34%,
      rgba(200, 208, 216, 0) 52%),
    radial-gradient(circle at bottom left,
      rgba(200, 208, 216, 0.65) 0%,
      rgba(200, 208, 216, 0.30) 8%,
      rgba(200, 208, 216, 0.08) 14%,
      rgba(200, 208, 216, 0) 22%);
  z-index: -1;
  pointer-events: none;
}

.youyong-side img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 0;
  box-shadow: 0 10px 30px rgba(0,0,0,0.12);
  cursor: pointer;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.4s ease;
}

.youyong-side:hover img {
  transform: scale(1.04);
  box-shadow: 0 14px 36px rgba(18, 58, 92, 0.18);
}

/* 右侧正文 */
.youyong-content {
  flex: 1;
  min-width: 0;
}

.youyong-content p {
  font-size: 16px;
  line-height: 1.95;
  color: #444;
  margin-bottom: 18px;
  text-align: justify;
}

.youyong-heading {
  font-size: 26px;
  font-weight: 900;
  color: var(--deep-blue);
  margin-top: 40px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--deep-blue);
  display: inline-block;
  letter-spacing: 0.5px;
}

.youyong-heading:first-child {
  margin-top: 0;
}

.youyong-content a.youyong-link {
  color: #0066FF;
  font-weight: normal;
  text-decoration: underline;
  transition: color 0.25s;
}

.youyong-content a.youyong-link:hover {
  color: #0044CC;
}

/* 移动端 */
@media (max-width: 900px) {
  .youyong-layout {
    flex-direction: column;
    gap: 30px;
    padding-left: 24px;
    padding-right: 24px;
  }
  .youyong-side {
    position: static;
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
  }
  .youyong-side::before,
  .youyong-side::after {
    display: none;
  }
  .youyong-side:hover img {
    transform: none;
  }
  .youyong-heading {
    font-size: 22px;
  }
  .youyong-content p {
    font-size: 15px;
  }
}

/* ===== Members 页面 ===== */
.members-main {
  padding: 70px 24px 100px;
}

.members-group {
  max-width: 1100px;
  margin: 0 auto 50px;
}

.members-group:last-child {
  margin-bottom: 0;
}

.members-heading {
  font-size: 32px;
  font-weight: 900;
  color: var(--deep-blue);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--deep-blue);
  display: inline-block;
  letter-spacing: 0.5px;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.members-subheading {
  font-size: 16px;
  color: var(--mid-gray);
  margin-bottom: 26px;
  font-style: italic;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.members-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px 26px;
  justify-content: center;
  justify-items: center;
}

.pi-wrap {
  display: flex;
  justify-content: flex-start;
  margin-top: 40px;
}

.pi-card {
  max-width: 100%;
  width: 100%;
}

.member-card {
  position: relative;
  display: flex;
  align-items: center;
  background: transparent;
  border: none;
  padding: 4px 0;
  transition: transform 0.35s ease;
  width: 100%;
  max-width: 360px;
  isolation: isolate;
}

.member-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 2px;
  height: 0;
  background: var(--deep-blue);
  transition: height 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.member-card:hover::before {
  height: calc(100% - 12px);
}

.member-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to left,
    rgba(200, 208, 216, 0) 0%,
    rgba(200, 208, 216, 0.25) 45%,
    rgba(200, 208, 216, 0.45) 100%);
  opacity: 0;
  transition: opacity 0.4s ease;
  z-index: 0;
  pointer-events: none;
}

.member-card:hover::after {
  opacity: 1;
}

.member-card:hover {
  transform: translateX(6px);
}

.pi-card::before {
  background: #0A2540;
}

.pi-card::after {
  opacity: 1;
  left: 0;
  top: -20px;
  width: 270%;
  height: calc(100% + 40px);
  background: linear-gradient(to right,
    rgba(200, 208, 216, 0.75) 0%,
    rgba(200, 208, 216, 0.55) 25%,
    rgba(200, 208, 216, 0.35) 45%,
    rgba(200, 208, 216, 0.15) 70%,
    rgba(200, 208, 216, 0) 100%);
}

.pi-card img {
  width: 160px !important;
  margin-left: 0;
}

.pi-card .member-info {
  padding-left: 28px;
}

.pi-card .member-info p {
  font-size: 15px;
  white-space: nowrap;
}

.member-card img {
  position: relative;
  z-index: 2;
  width: 118px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  display: block;
  flex-shrink: 0;
  background: #E8ECF0;
  border: none;
  border-radius: 2px;
  margin-left: 14px;
  transition: box-shadow 0.35s ease;
}

.member-card:hover img {
  box-shadow: 0 8px 20px rgba(18,58,92,0.15);
}

.member-info {
  position: relative;
  z-index: 1;
  flex: 1;
  min-width: 0;
  padding-left: 18px;
  text-align: left;
  background: transparent;
}

.member-info p.role {
  font-size: 18px;
  font-weight: 700;
  color: var(--deep-blue);
  margin-top: 6px;
  margin-bottom: 12px;
  line-height: 1.3;
  letter-spacing: 0.3px;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.member-info h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--deep-blue);
  margin-bottom: 3px;
  line-height: 1.3;
  letter-spacing: 0.3px;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.member-info h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--deep-blue);
  margin-bottom: 6px;
  line-height: 1.3;
  letter-spacing: 0.5px;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.member-info h4 a.member-name-link {
  color: #0066FF;
  text-decoration: underline;
  transition: color 0.25s;
}

.member-info h4 a.member-name-link:hover {
  color: #0044CC;
}

.member-info p {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.7;
  color: #666;
  margin-bottom: 2px;
  word-break: break-all;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.member-info a.member-link {
  color: #0066FF;
  font-weight: 400;
  text-decoration: underline;
  transition: color 0.25s;
}

.member-info a.member-link:hover {
  color: #0044CC;
}

@media (max-width: 1024px) {
  .members-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .members-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  .members-heading {
    font-size: 24px;
  }
  .member-card img {
    width: 100px;
    margin-left: 10px;
  }
  .pi-card img {
    width: 120px !important;
  }
  .member-info {
    padding-left: 14px;
  }
  .pi-card .member-info {
    padding-left: 18px;
  }
  .member-info p.role {
    font-size: 16px;
  }
  .member-info h3 {
    font-size: 17px;
  }
  .member-info h4 {
    font-size: 15px;
  }
  .member-info p {
    font-size: 13px;
  }
  .pi-card .member-info p {
    white-space: normal;
  }
}

/* ===== Activities 页面 ===== */
.activities-main {
  padding: 70px 40px 100px;
}

.activities-grid {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 50px 36px;
}

.activity-card {
  display: flex;
  flex-direction: column;
}

.activity-date {
  font-size: 14px;
  font-weight: 700;
  color: var(--deep-blue);
  letter-spacing: 1px;
  margin-bottom: 12px;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.activity-frame {
  background: transparent;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
  transition: box-shadow 0.4s ease, transform 0.4s ease;
}

.activity-card:hover .activity-frame {
  box-shadow: 0 14px 34px rgba(18,58,92,0.16);
  transform: translateY(-4px);
}

.activity-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  cursor: pointer;
  border-radius: 0;
  transition: transform 0.4s ease;
}

.activity-title {
  background: linear-gradient(to bottom,
    #F4F6F8 0%,
    #EDF0F3 100%);
  margin-top: 0;
  padding: 18px 20px 20px;
  font-size: 18px;
  font-weight: 700;
  color: var(--deep-blue);
  line-height: 1.5;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.activity-link {
  color: #0066FF;
  text-decoration: underline;
  transition: color 0.25s;
}

.activity-link:hover {
  color: #0044CC;
}

.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.92);
  z-index: 999;
  align-items: center;
  justify-content: center;
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90%;
  max-height: 88%;
  object-fit: contain;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
  animation: lightboxFadeIn 0.35s ease;
}

@keyframes lightboxFadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to   { opacity: 1; transform: scale(1); }
}

.lightbox-close {
  position: absolute;
  top: 24px;
  right: 36px;
  color: #FFFFFF;
  font-size: 40px;
  cursor: pointer;
  line-height: 1;
  opacity: 0.75;
  transition: opacity 0.25s;
}

.lightbox-close:hover {
  opacity: 1;
}

.lightbox-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: #FFFFFF;
  font-size: 44px;
  cursor: pointer;
  padding: 20px;
  opacity: 0.65;
  transition: opacity 0.25s;
  user-select: none;
}

.lightbox-arrow:hover {
  opacity: 1;
}

.lightbox-prev {
  left: 24px;
}

.lightbox-next {
  right: 24px;
}

@media (max-width: 900px) {
  .activities-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 36px 24px;
  }
}

@media (max-width: 600px) {
  .activities-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .activity-title {
    font-size: 16px;
    padding: 14px 16px 16px;
  }
  .lightbox-arrow {
    font-size: 32px;
    padding: 12px;
  }
  .lightbox-close {
    font-size: 32px;
    top: 16px;
    right: 20px;
  }
}

/* ===== News 页面 ===== */
.news-section {
  padding: 80px 24px 140px;
  background: linear-gradient(to bottom,
    #F0F2F5 0%,
    #F5F6F8 40%,
    #FAFBFC 70%,
    #FFFFFF 100%);
}

.news-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.news-page {
  display: none;
}

.news-page.active {
  display: block;
}

.news-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 22px;
  background: var(--white);
  padding: 12px 28px;
  margin-bottom: 14px;
  border-radius: 0;
  box-shadow: 0 4px 16px rgba(18, 58, 92, 0.08);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.4s ease;
}

.news-item:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 30px rgba(18, 58, 92, 0.16);
}

.news-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 0;
  background: var(--deep-blue);
  transition: height 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.news-item:hover::before {
  height: 100%;
}

.news-date {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 78px;
  flex-shrink: 0;
  line-height: 1.1;
}

.news-day {
  font-size: 30px;
  font-weight: 900;
  color: var(--deep-blue);
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.news-month {
  font-size: 12px;
  font-weight: 400;
  color: var(--deep-blue);
  letter-spacing: 0.5px;
  margin-top: 4px;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.news-divider {
  width: 1px;
  height: 40px;
  background: #C8D0D8;
  flex-shrink: 0;
}

.news-text {
  flex: 1;
  min-width: 0;
  font-size: 16px;
  line-height: 1.6;
  color: #444;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.news-pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-top: 50px;
}

.page-btn {
  width: 44px;
  height: 44px;
  background: var(--white);
  border: 1px solid #D8DDE3;
  color: var(--deep-blue);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  border-radius: 0;
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.page-btn:hover {
  background: #E8ECF0;
  transform: translateY(-2px);
}

.page-btn.active {
  background: var(--deep-blue);
  color: var(--white);
  border-color: var(--deep-blue);
}

@media (max-width: 768px) {
  .news-section {
    padding: 60px 16px 100px;
  }
  .news-item {
    padding: 10px 16px;
    gap: 14px;
  }
  .news-date {
    width: 58px;
  }
  .news-day {
    font-size: 22px;
  }
  .news-month {
    font-size: 11px;
  }
  .news-divider {
    height: 32px;
  }
  .news-text {
    font-size: 14px;
  }
  .page-btn {
    width: 38px;
    height: 38px;
    font-size: 14px;
  }
}

/* ===== Postdoc 页面 ===== */
.postdoc-section {
  padding: 80px 24px 140px;
  background: linear-gradient(to bottom,
    #F0F2F5 0%,
    #F5F6F8 40%,
    #FAFBFC 70%,
    #FFFFFF 100%);
}

.postdoc-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.postdoc-title {
  font-size: 28px;
  font-weight: 900;
  color: var(--deep-blue);
  text-align: center;
  line-height: 1.5;
  margin-bottom: 40px;
  letter-spacing: 0.5px;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.postdoc-heading {
  font-size: 24px;
  font-weight: 900;
  color: var(--deep-blue);
  margin-top: 44px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--deep-blue);
  display: inline-block;
  letter-spacing: 0.5px;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.postdoc-text {
  font-size: 16px;
  line-height: 1.95;
  color: #444;
  margin-bottom: 18px;
  text-align: justify;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.postdoc-link {
  color: #0066FF;
  font-weight: normal;
  text-decoration: underline;
  transition: color 0.25s;
}

.postdoc-link:hover {
  color: #0044CC;
}

@media (max-width: 768px) {
  .postdoc-section {
    padding: 60px 18px 100px;
  }
  .postdoc-title {
    font-size: 22px;
    margin-bottom: 30px;
  }
  .postdoc-heading {
    font-size: 20px;
    margin-top: 34px;
  }
  .postdoc-text {
    font-size: 15px;
  }
}
/* ===== Join Us 页面 ===== */
.join-page-section {
  padding: 80px 24px 140px;
  background: var(--white);
}

.join-page-inner {
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 80px;
}

/* 每个区块 */
.join-block-item {
  display: flex;
  flex-direction: column;
}

/* 小标题：居中，字号再放大 */
.join-col-title {
  font-size: 36px;
  font-weight: 900;
  color: var(--deep-blue);
  margin-bottom: 28px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--deep-blue);
  display: inline-block;
  align-self: center;
  letter-spacing: 0.5px;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

/* 正文：字号保持，颜色变浅（参考 home 的 --mid-gray #555） */
.join-col-text {
  font-size: 19px;
  line-height: 1.95;
  color: var(--mid-gray);
  text-align: justify;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

/* Postdoc 行：左文字 + 右长方形 */
.join-postdoc-row {
  display: flex;
  align-items: stretch;
  gap: 50px;
}

.join-postdoc-text {
  flex: 1;
  min-width: 0;
  margin-bottom: 0;
}

/* 右侧长方形（View Details / Contact Us） */
.join-view-details {
  width: 260px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(to right,
    #D8DDE3 0%,
    #E4E8ED 40%,
    #F0F2F5 75%,
    #FFFFFF 100%);
  color: var(--deep-blue);
  text-decoration: none;
  transition: box-shadow 0.4s ease, transform 0.4s ease;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.join-view-details:hover {
  box-shadow: 0 8px 22px rgba(18, 58, 92, 0.14);
  transform: translateY(-2px);
}

.join-view-text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.join-view-arrow {
  font-size: 24px;
  font-weight: 300;
  line-height: 1;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.join-view-details:hover .join-view-arrow {
  transform: translateX(6px);
}

/* 三个链接统一：粗体深蓝、无下划线 */
.join-dark-bold-link {
  color: var(--deep-blue);
  font-weight: 700;
  text-decoration: none;
}
.join-dark-bold-link:hover {
  text-decoration: none;
}

/* 照片 */
.join-page-photo {
  text-align: center;
}

.join-page-photo img {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 6px;
  box-shadow: 0 4px 18px rgba(0,0,0,0.12);
}

/* 移动端 */
@media (max-width: 900px) {
  .join-page-section {
    padding: 60px 18px 100px;
  }
  .join-page-inner {
    gap: 50px;
  }
  .join-col-title {
    font-size: 26px;
  }
  .join-col-text {
    font-size: 16px;
  }
  .join-postdoc-row {
    flex-direction: column;
    gap: 24px;
  }
  .join-view-details {
    width: 100%;
    padding: 22px 0;
  }
  .join-view-text {
    font-size: 18px;
  }
  .join-view-arrow {
    font-size: 20px;
  }
}