/* 基础排版与色彩，参�?AEA 简约学术风�?*/
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: #333;
  background-color: #f5f5f5;
}

a {
  color: #8b1c1c;
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  width: 100%;
  background-color: #ffffff;
  border-bottom: 1px solid #ddd;
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.2rem 1.5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.lang-switch {
  flex-shrink: 0;
  font-size: 0.9rem;
  margin-left: auto;
}

.lang-switch a {
  color: #8b1c1c;
  font-weight: 500;
}

.lang-switch .current {
  color: #999;
  cursor: default;
}

.lang-switch .lang-sep {
  color: #bbb;
  margin: 0 0.25rem;
  pointer-events: none;
}

.brand-logos {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

.brand-logo {
  height: 48px;
  width: auto;
  max-width: 120px;
  object-fit: contain;
  display: block;
}

.brand-text {
  min-width: 0;
}

.brand-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: #c41e3a;
  margin: 0 0 0.2rem;
  line-height: 1.2;
}

.brand-subtitle {
  font-size: 0.85rem;
  color: #666;
  margin: 0;
}

.layout {
  max-width: 1120px;
  width: 100%;
  margin: 1.5rem auto 2rem;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 2rem;
}

.side-nav h2 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #777;
  margin: 0 0 0.75rem;
}

.side-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.side-nav li {
  margin-bottom: 0.4rem;
}

.side-nav li a {
  font-size: 0.9rem;
  color: #444;
}

.side-nav li.active a {
  font-weight: 600;
  color: #8b1c1c;
}

.content {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  padding: 1.5rem 1.75rem 2rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1.4fr);
  gap: 1.5rem;
  align-items: center;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid #eee;
  padding-bottom: 1.5rem;
}

.hero-label {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #999;
  margin: 0 0 0.4rem;
}

.hero h1 {
  font-size: 1.5rem;
  margin: 0 0 0.5rem;
}

.hero-meta {
  font-size: 0.95rem;
  color: #555;
  margin: 0 0 0.8rem;
}

.hero-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0;
}

.hero-image img {
  width: 100%;
  border-radius: 4px;
  display: block;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.info-card {
  border: 1px solid #e6e6e6;
  background-color: #fafafa;
  padding: 1rem 1rem 1.1rem;
}

.info-card-link {
  color: inherit;
  display: block;
  transition: border-color 0.2s, background-color 0.2s;
}

.info-card-link:hover,
.info-card-link:focus {
  border-color: #8b1c1c;
  background-color: #fff;
  text-decoration: none;
}

.info-card-link h2 {
  color: #8b1c1c;
  font-size: 1rem;
}

.info-card-link:hover h2,
.info-card-link:focus h2 {
  text-decoration: underline;
}

.info-card-link p {
  font-size: 0.88rem;
  line-height: 1.5;
  margin: 0.4rem 0 0;
  color: #555;
}

.info-card h2 {
  font-size: 1rem;
  margin: 0 0 0.75rem;
}

.info-card dl {
  margin: 0;
}

.info-card dl div {
  margin-bottom: 0.4rem;
}

.info-card dt {
  font-weight: 600;
  font-size: 0.88rem;
}

.info-card dd {
  margin: 0.1rem 0 0;
  font-size: 0.88rem;
}

.plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
}

.plain-list li + li {
  margin-top: 0.35rem;
}

.section-block {
  margin-bottom: 1.5rem;
}

.section-block h2 {
  font-size: 1.15rem;
  border-bottom: 1px solid #e0e0e0;
  padding-bottom: 0.4rem;
  margin: 0 0 0.6rem;
}

.section-block p {
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0 0 0.7rem;
}

.section-divider {
  border: 0;
  border-top: 1px solid #e0e0e0;
  margin: 0.9rem 0 0;
}

/* Keynote speaker block on homepage */
.keynote {
  margin-bottom: 1.75rem;
}

.keynote-inner {
  display: block;
}

.keynote-photo {
  float: right;
  width: 200px;
  height: auto;
  border-radius: 4px;
  object-fit: cover;
  display: block;
  margin: 2.05rem 0 0.6rem 1rem;
}

.keynote-text::after {
  content: "";
  display: block;
  clear: both;
}

.keynote-text h2 {
  font-size: 1.15rem;
  border-bottom: 1px solid #e0e0e0;
  padding-bottom: 0.4rem;
  margin: 0 0 0.6rem;
  color: inherit;
}

.keynote-name {
  margin: 0 0 0.5rem;
  font-weight: 600;
  color: #8b1c1c;
}

.keynote-bio {
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
  color: #333;
}

/* Inner (secondary) page content */
.content h1 {
  font-size: 1.35rem;
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #e0e0e0;
}

.page-body p {
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0 0 0.7rem;
}

.page-body h2 {
  font-size: 1.1rem;
  margin: 1.1rem 0 0.5rem;
}

.page-body h3 {
  font-size: 1rem;
  margin: 0.9rem 0 0.4rem;
}

.page-body ul {
  margin: 0.3rem 0 0.9rem 1.2rem;
  padding: 0;
}

.page-body li {
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0 0 0.25rem;
}

.site-footer {
  border-top: 1px solid #ddd;
  background-color: #ffffff;
  padding: 1rem 1.5rem 1.4rem;
  margin-top: auto;
  font-size: 0.85rem;
  color: #666;
}

.footer-links {
  max-width: 1120px;
  margin: 0 auto 0.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  max-width: 1120px;
  margin: 0 auto;
}

/* 响应式调�?*/
@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .side-nav {
    order: -1;
  }

  .content {
    padding: 1.25rem 1.25rem 1.6rem;
  }

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

@media (max-width: 800px) {
  .info-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .brand {
    flex-direction: row;
    align-items: flex-start;
  }

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

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

  .keynote-photo {
  float: right;
  width: 200px;
  height: auto;
  border-radius: 4px;
  object-fit: cover;
  display: block;
  margin: 2.05rem 0 0.6rem 1rem;
}
}