/* ===== 基础与排版：极简现代 ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  color: #1a1a1a;
  background: #fff;
  font-size: 16px;
}

@media (min-width: 768px) {
  body {
    font-size: 17px;
    line-height: 1.65;
  }
}

/* ===== 布局容器 ===== */
.page-wrap {
  max-width: 56rem;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

@media (min-width: 768px) {
  .page-wrap {
    padding: 0 2rem 4rem;
  }
}

/* ===== 页头 ===== */
.header-flex {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 2rem 0 1.5rem;
  flex-wrap: wrap;
}

.header-flex .info {
  flex: 1;
  min-width: 0;
  line-height: 1.5;
}

.header-flex h1 {
  margin: 0 0 0.25rem 0;
  font-size: 1.625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

@media (min-width: 768px) {
  .header-flex h1 {
    font-size: 1.875rem;
  }
}

.header-flex .info p {
  margin: 0 0 0.25rem 0;
  font-size: 1.0625rem;
  color: #444;
}

.header-flex .info p:last-child {
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .header-flex .info p {
    font-size: 1.125rem;
  }
}

.avatar-rect {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .avatar-rect {
    width: 180px;
    height: 180px;
  }
}

/* ===== 页内导航 ===== */
.section-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 1.75rem;
  padding: 0.7rem 0;
  margin-bottom: 2rem;
  background: #fff;
  border-top: 1px solid #ececec;
  border-bottom: 1px solid #e2e2e2;
}

.section-nav a {
  color: #555;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0;
}

.section-nav a:hover {
  color: #0066cc;
}

/* ===== 主内容区 ===== */
main {
  padding-top: 0;
}

section {
  margin-bottom: 2.5rem;
  scroll-margin-top: 4rem;
}

section:last-of-type {
  margin-bottom: 2rem;
}

/* ===== 标题 ===== */
h2 {
  margin: 0 0 1rem 0;
  padding-bottom: 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: #1a1a1a;
  border-bottom: 1px solid #e5e5e5;
}

@media (min-width: 768px) {
  h2 {
    font-size: 1.375rem;
    margin: 0 0 1.25rem 0;
  }
}

h3 {
  margin: 1.1rem 0 0.35rem 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: #1a1a1a;
}

@media (min-width: 768px) {
  h3 {
    font-size: 1.25rem;
  }
}

/* ===== 正文与列表 ===== */
p {
  margin: 0 0 0.85em 0;
  color: #333;
}

p:last-child {
  margin-bottom: 0;
}

ul {
  margin: 0 0 1em 0;
  padding-left: 1.25rem;
}

/* 段落后的列表：与列表项间距一致，避免“紧贴上文” */
p + ul {
  margin-top: 0.5em;
}

li {
  margin-bottom: 0.35em;
}

li:last-child {
  margin-bottom: 0;
}

/* Research：嵌套列表保持紧凑，但使用合理间距值 */
#research p + ul {
  margin-top: 0.3em;
}
#research p:has(+ ul) {
  margin-bottom: 0.35em;
}
#research ul + p {
  margin-top: 1em;
}
#research ul {
  margin-top: 0.3em;
  margin-bottom: 0.5em;
  padding-left: 1.2rem;
}
#research > ul > li {
  margin-bottom: 0.4em;
}
#research ul ul {
  margin-top: 0.2em;
  margin-bottom: 0;
  padding-left: 1rem;
}
#research li li {
  margin-bottom: 0.2em;
}
#research li li:last-child {
  margin-bottom: 0;
}

/* ===== 链接 ===== */
a {
  text-decoration: none;
  color: #1a1a1a;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  padding: 0.1em 0;
}

a:hover {
  color: #0066cc;
  border-bottom-color: #0066cc;
}

a:focus-visible {
  outline: 2px solid #0066cc;
  outline-offset: 2px;
}

.blue-tag {
  color: #0066cc;
  border-bottom-color: rgba(0, 102, 204, 0.3);
}

.blue-tag:hover {
  color: #004499;
  border-bottom-color: #004499;
}

.accent {
  color: #1f77b4;
}

/* ===== Services 区块 ===== */
#services .service-label {
  margin: 0 0 0.4em 0;
  font-size: 1rem;
  color: #333;
}

/* 第二个及之后的分组标签，加顶部间距与前组分开 */
#services .service-list + .service-label {
  margin-top: 1.25rem;
}

@media (min-width: 768px) {
  #services .service-label {
    font-size: 1.0625rem;
  }
}

#services .service-list {
  margin: 0 0 1.25rem 0;
  padding-left: 1.25rem;
}

#services .service-list li {
  margin-bottom: 0.4em;
  font-size: 1rem;
  color: #333;
}

@media (min-width: 768px) {
  #services .service-list li {
    font-size: 1.0625rem;
  }
}

#services .service-content {
  margin: 0 0 0 1.25rem;
  padding-left: 0;
  font-size: 1rem;
  color: #333;
}

@media (min-width: 768px) {
  #services .service-content {
    font-size: 1.0625rem;
  }
}

/* ===== 论文与奖项 ===== */
#paper-list {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  column-gap: 1.5rem;
}

#paper-list > ul {
  margin: 0 0 1.35rem;
  padding: 0;
  list-style: none;
}

.paper-heading {
  display: block;
  line-height: 1.45;
  margin-bottom: 0.12rem;
}

.paper-title {
  font-weight: 500;
}

.paper-venue-tag {
  font-weight: 650;
  margin-right: 0.3em;
}

.authors {
  display: inline;
  font-size: 0.9rem;
  color: #555;
  line-height: 1.45;
}

.venue-full {
  font-size: 0.9rem;
  color: #666;
  line-height: 1.45;
}

.award-inline {
  font-size: 0.875rem;
  color: #c41e3a;
  font-weight: 600;
  font-style: italic;
}

.award {
  font-size: 0.875rem;
  color: #c41e3a;
  font-weight: 600;
  font-style: italic;
}

.highlight {
  font-weight: 500;
  color: #1a1a1a;
}

/* 论文条目：与正文行高一致，上下 padding 对称 */
#paper-list li {
  margin: 0;
  line-height: 1.45;
  padding: 0.65rem 0;
  border-top: 1px solid #f0f0f0;
}

#paper-list li:first-child {
  border-top: none;
  padding-top: 0;
}

#paper-list li:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
}

/* 年份分组标题 */
#paper-list h3 {
  margin: 0;
  padding-top: 0.65rem;
  font-size: 1rem;
  font-weight: 600;
  color: #777;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

#paper-list > h3:first-child {
  padding-top: 0;
}

#paper-list > h3:first-child + ul > li:first-child {
  padding-top: 0;
}

/* paper list 加载/错误状态 */
.paper-list-loading,
.paper-list-error {
  color: #888;
  font-style: italic;
}

/* ===== 页脚 ===== */
footer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
  color: #666;
  border-top: 1px solid #eee;
}

footer p {
  margin: 0;
  color: #666;
}

/* ===== Awards 列表：与 Services 节奏一致 ===== */
#awards ul {
  margin-top: 0.25em;
  margin-bottom: 0;
}
#awards li {
  margin-bottom: 0.4em;
}
#awards li:last-child {
  margin-bottom: 0;
}

/* ===== 移动端：页头与触控优化 ===== */
@media (max-width: 567px) {
  .page-wrap {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .header-flex {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
    padding: 1.25rem 0 1rem;
  }

  .header-flex .info {
    width: 100%;
  }

  .header-flex h1 {
    font-size: 1.5rem;
  }

  .header-flex .info p {
    font-size: 1rem;
  }

  .avatar-rect {
    width: 104px;
    height: 104px;
  }

  .section-nav {
    justify-content: space-between;
    gap: 0.5rem;
    margin: 0 -0.15rem 1.75rem;
    padding: 0.65rem 0.15rem;
  }

  .section-nav a {
    font-size: 0.8125rem;
  }

  section {
    margin-bottom: 2rem;
  }

  #paper-list {
    display: block;
  }

  #paper-list h3 {
    padding-top: 0;
    margin: 1.75rem 0 0.2rem;
  }

  #paper-list > h3:first-child {
    margin-top: 0;
  }

  #paper-list > ul {
    margin-bottom: 0;
  }

  #paper-list li {
    padding: 0.55rem 0;
  }
}

/* ===== 宽屏 ===== */
@media (min-width: 1200px) {
  .page-wrap {
    max-width: 60rem;
  }
}