/* Modern academic clean design */
body {
margin: 0;
font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
color: #333;
background: #fafafa;
}

.container {
width: 90%;
max-width: 1000px;
margin: auto;
}

/* Header */
.site-header {
background: #ffffff;
border-bottom: 1px solid #e2e2e2;
padding: 15px 0;
position: sticky;
top: 0;
z-index: 10;
font-size: 0.75rem;
}
.nav {
display: flex;
justify-content: space-between;
align-items: center;
}

.nav nav a {
  position: relative;
  padding: 6px 0;
  color: rgb(0,63,163);
  margin-left: 20px;
  text-decoration: none;
}

.nav nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 1.5px;
  background: rgb(0,63,163);
  transition: width 0.25s ease;
}

.nav nav a:hover::after {
  width: 100%;
}

.nav nav a:hover {
  color: rgb(0,63,163);
}

.nav nav a.active {
  color: rgb(0,63,163);
}

.nav nav a.active::after {
  width: 100%;
}
@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .nav nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
  }

  .nav nav a {
    margin-left: 0;
    padding: 6px 0;
  }
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: rgb(0,63,163);
  letter-spacing: 0.3px;
  text-decoration: none;
}
.logo.active {
  color: rgb(0,63,163);
}

.logo.active::after {
  content: "";
  display: block;
  width: 100%;
  height: 2px;
  background: rgb(0,63,163);
  margin-top: 4px; /* 下划线和文字距离 */
}


.hero-inner {
  max-width: 1000px;
  margin: 0px auto;
  position: relative;
  text-align: center;
}

.hero-inner img {
  width: 100%;
  object-fit: cover;
}

.hero-text {
  position: absolute;
  left: 40px;
  right: 40px;
  bottom: 70px;
}

/* 小屏适配 */
@media (max-width: 768px) {
  .hero-text {
    left: 16px;
    right: 16px;
    bottom: 20px;        /* 关键：降低 bottom */
    padding: 10px;
  }
  .hero h1 {
    font-size: 2rem;
  }
}

.hero h1 {
    font-size: clamp(2.2rem, 6vw, 4rem);
    margin-bottom: clamp(12px, 3vw, 20px);
    color: #203A70;
  }

.tagline {
  font-size: clamp(1.1rem, 3vw, 1.7rem);
  color: #203A70;
}
.tagline-2 {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  color: #203A70;
}

/* Content */
.content {
padding: 40px 0;
line-height: 1.6;
font-size: 18px;
}

.content h1 {
margin-top: 0;
color: rgb(0,63,163);
}


.content h2 {
margin-top: 0;
color: rgb(0,63,163);
}

/* Footer */
.site-footer {
background: #ffffff;
border-top: 1px solid #e2e2e2;
padding: 20px 0;
text-align: center;
margin-top: 40px;
}

.logo-graph img {
  width: 150px;
  object-fit: cover;
  border-radius: 10px;
}

.slider-window {
    position: relative;
    object-fit: cover;
    width: 100%; /* 宽度保持与父容器一致 */
    margin: auto;
    overflow: hidden;
    border-radius: 10px;
    padding: 20px 0;
  }

  /* 图片容器 */
  .graph-slider {
    object-fit: cover;
    display: flex;
    transition: transform 0.4s ease-in-out; /* 切换时的平滑动画 */
  }

  .graph-slider img {
    width: 100%;
    flex-shrink: 0; /* 确保图片不被压缩 */
    object-fit: cover;
    display: block;
  }

  /* 左右切换按钮 */
  .nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    color: white;
    border: none;
    padding: 15px 10px;
    cursor: pointer;
    font-size: 18px;
    z-index: 10;
    border-radius: 5px;
  }

  .nav-btn:hover { background: rgba(0, 0, 0, 0.8); }
  .prev { left: 10px; }
  .next { right: 10px; }
  
.speaker {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    align-items: flex-start;
}

.speaker-photo img {
    width: 180px;
    border-radius: 8px;
}

.speaker-info h3 {
    margin-top: 0;
}

.venue-wrapper {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    margin-top: 20px;
    margin-bottom: 20px;
}

.venue-info {
    flex: 1;
    font-size: 18px;
}

.map-container {
    flex: 1.2;
}

.map-container iframe {
    width: 100%;
    height: 400px;
    border-radius: 8px;
}
@media (max-width: 768px) {
    .venue-wrapper {
        flex-direction: column;
    }
    .map-container {
        width: 100%;
        flex: 100%;
    }

}