/* ============================================
   Design Polish — 视觉精修层
   加载于 theme-claude.css 之后；同优先级、靠后生效。
   设计语言：宣纸纸片、朱砂印章、玉色点缀（与主题一致）。
   暗色模式经由 CSS 变量自动适配。
   ============================================ */

/* ---------- 全局质感 ---------- */

body.theme-claude {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body.theme-claude ::selection {
  background: var(--claude-accent);
  color: var(--claude-paper);
}

body.theme-claude :focus-visible {
  outline: 2px solid color-mix(in srgb, var(--claude-jade) 65%, transparent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 细滚动条（与主题同色） */
body.theme-claude ::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

body.theme-claude ::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--claude-secondary) 34%, transparent);
  border: 3px solid var(--claude-bg);
  border-radius: 999px;
}

body.theme-claude ::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--claude-accent) 55%, transparent);
}

body.theme-claude ::-webkit-scrollbar-track {
  background: transparent;
}

/* ---------- 顶栏导航 ---------- */

body.theme-claude .top-nav {
  box-shadow: 0 10px 30px -18px rgba(36, 48, 44, 0.35);
}

/* 链接下划线滑入动画 */
body.theme-claude .nav-left a {
  position: relative;
}

body.theme-claude .nav-left a::after {
  background: var(--claude-accent);
  border-radius: 2px;
  bottom: -3px;
  content: "";
  height: 2px;
  left: 0;
  position: absolute;
  right: 0;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}

body.theme-claude .nav-left a:not(:first-child)::after {
  bottom: 2px;
  left: 10px;
  right: 10px;
}

body.theme-claude .nav-left a:hover::after,
body.theme-claude .nav-left a.nav-active::after {
  transform: scaleX(1);
}

/* 首个链接（Home）原本无圆角背景，hover 不再突兀 */
body.theme-claude .nav-left a.nav-active {
  font-weight: 650;
}

/* ---------- 侧栏名片 ---------- */

/* 头像：纸环 + 玉色外环（玉璧意象） */
body.theme-claude .image.avatar img {
  border: 4px solid var(--claude-paper);
  outline: 1.5px solid color-mix(in srgb, var(--claude-jade) 42%, transparent);
  outline-offset: 4px;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s ease, outline-color 0.35s ease;
}

body.theme-claude .image.avatar:hover img {
  box-shadow: 0 18px 44px var(--claude-card-shadow);
  outline-color: color-mix(in srgb, var(--claude-jade) 75%, transparent);
  transform: translateY(-3px) scale(1.015);
}

/* 姓名层级：英文展示字 + 中文名加宽字距 */
body.theme-claude .site-name {
  font-family: "Raleway", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  letter-spacing: 0.015em;
}

body.theme-claude .site-name-cn {
  color: var(--claude-secondary);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-weight: 600;
  letter-spacing: 0.34em;
  padding-left: 0.34em; /* 补偿末字间距，保持视觉居中 */
}

/* 邮箱：纸片 chip */
body.theme-claude .site-email {
  background: var(--claude-paper);
  border: 1px solid var(--claude-border);
  border-radius: 10px;
  box-shadow: 0 2px 10px var(--claude-card-shadow);
  display: inline-block;
  padding: 8px 14px;
}

/* 社交图标：描边统一、hover 更有弹性 */
body.theme-claude .social-icons a {
  border: 1px solid var(--claude-border);
  transition: transform 0.24s cubic-bezier(0.34, 1.56, 0.64, 1), background-color 0.2s ease, box-shadow 0.24s ease, border-color 0.2s ease;
}

body.theme-claude .social-icons a:hover {
  border-color: var(--claude-accent);
  transform: translateY(-3px) scale(1.06);
}

/* ---------- Section 标题：印章 + 渐隐发夹线 ---------- */

body.theme-claude .section-title,
body.theme-claude .section.is-collapsible .section-title {
  align-items: center;
  background-image: linear-gradient(90deg, var(--claude-accent), color-mix(in srgb, var(--claude-accent) 10%, transparent));
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 100% 2px;
  border-bottom: none;
  display: inline-flex;
  font-family: "Noto Serif SC", "Songti SC", Georgia, serif;
  font-size: 20px;
  font-weight: 700;
  gap: 12px;
  letter-spacing: 0.02em;
  padding-bottom: 11px;
  padding-right: 56px; /* 发夹线向右延伸，版面更透气 */
}

/* 朱砂印章方块 */
body.theme-claude .section-title::before {
  background: var(--claude-accent);
  border-radius: 2.5px;
  box-shadow: 0 2px 6px color-mix(in srgb, var(--claude-accent) 38%, transparent);
  content: "";
  flex: 0 0 auto;
  height: 10px;
  width: 10px;
}

/* 折叠箭头与印章对齐微调 */
body.theme-claude .section.is-collapsible .section-title::after {
  margin-left: 2px;
}

/* hover 时发夹线变玉色，与文字变色一致 */
body.theme-claude .section.is-collapsible .section-title:hover,
body.theme-claude .section.is-collapsible .section-title:focus-visible {
  background-image: linear-gradient(90deg, var(--claude-jade), color-mix(in srgb, var(--claude-jade) 10%, transparent));
}

/* ---------- 时间线条目：宣纸卡片化 ---------- */

body.theme-claude .timeline-item {
  background: var(--claude-paper);
  border: 1px solid var(--claude-border);
  border-radius: 14px;
  box-shadow: 0 2px 10px var(--claude-card-shadow);
  margin-bottom: 16px;
  padding: 18px 20px 15px;
  transition: transform 0.22s ease, box-shadow 0.26s ease, border-color 0.22s ease, background-color 0.3s ease;
}

body.theme-claude .timeline-item:hover {
  border-color: color-mix(in srgb, var(--claude-accent) 38%, transparent);
  box-shadow: 0 12px 30px var(--claude-card-shadow);
  transform: translateY(-2px);
}

/* 竖线与圆点：配合卡片内边距重新定位，线条更细更柔 */
body.theme-claude .timeline-item::before {
  background: linear-gradient(to bottom, color-mix(in srgb, var(--claude-accent) 55%, transparent), transparent);
  left: -21px;
  width: 1.5px;
}

body.theme-claude .timeline-item::after {
  background: var(--claude-paper);
  border: 2.5px solid var(--claude-accent);
  height: 8px;
  left: -26px;
  top: 24px;
  width: 8px;
}

body.theme-claude .timeline-item .experience-content p:last-child,
body.theme-claude .timeline-item .action-links:last-child {
  margin-bottom: 0;
}

body.theme-claude .exp-period {
  color: var(--claude-jade);
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* 机构 Logo：在纸卡内更服帖 */
body.theme-claude .institution-logo {
  border-radius: 10px;
}

/* Report / Slides 链接：胶囊化 */
body.theme-claude .action-links a {
  border: 1px solid var(--claude-border);
  border-radius: 999px;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

body.theme-claude .action-links a:hover {
  transform: translateY(-1px);
}

/* ---------- News 卡片 ---------- */

body.theme-claude .news-card {
  background: var(--claude-paper);
  border: 1px solid var(--claude-border) !important; /* 覆盖旧的三边描边补丁 */
  border-left: 3px solid var(--claude-accent) !important;
  border-radius: 12px;
  box-shadow: 0 2px 10px var(--claude-card-shadow);
  transition: transform 0.2s ease, box-shadow 0.24s ease, border-color 0.2s ease, background-color 0.3s ease;
}

body.theme-claude .news-card:hover {
  box-shadow: 0 10px 26px var(--claude-card-shadow);
  transform: translateY(-1px);
}

body.theme-claude .news-card strong {
  color: var(--claude-accent);
  font-family: "Ubuntu Mono", "SF Mono", monospace;
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ---------- 研究方向：三列卡片网格 ---------- */

body.theme-claude .research-direction-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

body.theme-claude .research-direction,
body.theme-claude .research-direction:first-child {
  background: var(--claude-paper);
  border: 1px solid var(--claude-border);
  border-radius: 14px;
  box-shadow: 0 2px 10px var(--claude-card-shadow);
  display: flex;
  flex-direction: column;
  padding: 20px 18px 18px;
  position: relative;
  transition: transform 0.22s ease, box-shadow 0.26s ease, border-color 0.22s ease, background-color 0.3s ease;
}

body.theme-claude .research-direction:hover {
  border-color: color-mix(in srgb, var(--claude-accent) 38%, transparent);
  box-shadow: 0 12px 30px var(--claude-card-shadow);
  transform: translateY(-3px);
}

/* 图标 chip：与材料网格一致的渐变语言 */
body.theme-claude .research-direction-icon {
  align-items: center;
  background: linear-gradient(135deg, var(--claude-accent-soft), color-mix(in srgb, var(--claude-jade) 10%, transparent));
  border-radius: 10px;
  color: var(--claude-accent);
  display: inline-flex;
  font-size: 16px;
  height: 40px;
  justify-content: center;
  margin-bottom: 14px;
  transition: transform 0.24s cubic-bezier(0.34, 1.56, 0.64, 1);
  width: 40px;
}

body.theme-claude .research-direction:hover .research-direction-icon {
  transform: scale(1.08) rotate(-4deg);
}

/* 序号：退居卡片右上角，作淡淡的标记 */
body.theme-claude .research-direction-index {
  color: var(--claude-secondary);
  font-family: "Ubuntu Mono", "SF Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  opacity: 0.55;
  padding: 0;
  position: absolute;
  right: 16px;
  top: 16px;
}

body.theme-claude .research-direction h4 {
  color: var(--claude-text);
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.35;
  margin: 0 0 8px;
  text-transform: none;
}

body.theme-claude .research-direction p {
  color: var(--claude-secondary);
  font-size: 14px;
  line-height: 1.65;
  margin: 0;
}

/* 相关文章链接：贴卡片底部，虚线分隔 */
body.theme-claude .research-direction > p {
  flex: 1 0 auto; /* 撑开剩余空间，让链接自然贴底 */
}

body.theme-claude .research-direction-essay {
  align-items: flex-start;
  border-top: 1px dashed color-mix(in srgb, var(--claude-accent) 26%, transparent);
  color: var(--claude-secondary);
  display: flex;
  gap: 9px;
  margin-top: 14px;
  padding-top: 13px;
  text-decoration: none;
}

body.theme-claude .research-direction-essay > i {
  color: var(--claude-jade);
  font-size: 12.5px;
  margin-top: 2.5px;
}

body.theme-claude .research-direction-essay-label {
  color: var(--claude-jade);
  display: block;
  font-size: 10.5px;
  font-weight: 750;
  letter-spacing: 0.09em;
  margin-bottom: 3px;
  text-transform: uppercase;
}

body.theme-claude .research-direction-essay-title {
  color: var(--claude-text);
  display: block;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  transition: color 0.18s ease;
}

body.theme-claude .research-direction-essay:hover .research-direction-essay-title {
  color: var(--claude-accent);
}

@media (max-width: 720px) {
  body.theme-claude .research-direction-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- Selected Materials 网格 ---------- */

body.theme-claude .material-link {
  background: var(--claude-paper);
  border-radius: 12px;
  box-shadow: 0 2px 10px var(--claude-card-shadow);
  transition: transform 0.2s ease, box-shadow 0.24s ease, border-color 0.2s ease, background-color 0.3s ease;
}

body.theme-claude .material-link:hover {
  box-shadow: 0 12px 28px var(--claude-card-shadow);
  transform: translateY(-2px);
}

body.theme-claude .material-link-icon {
  background: linear-gradient(135deg, var(--claude-accent-soft), color-mix(in srgb, var(--claude-jade) 10%, transparent));
  border: none;
  border-radius: 10px;
}

/* ---------- 首页按钮组 ---------- */

body.theme-claude .profile-action {
  border-radius: 999px;
  min-height: 42px;
  padding: 0 18px;
}

body.theme-claude .profile-action:hover {
  transform: translateY(-2px);
}

body.theme-claude .profile-action-primary {
  background: linear-gradient(135deg, var(--claude-accent), color-mix(in srgb, var(--claude-accent) 82%, #5c1a14));
  box-shadow: 0 6px 18px color-mix(in srgb, var(--claude-accent) 32%, transparent);
}

body.theme-claude .profile-action-primary:hover {
  background: linear-gradient(135deg, color-mix(in srgb, var(--claude-accent) 92%, #fff), var(--claude-accent));
  box-shadow: 0 10px 24px color-mix(in srgb, var(--claude-accent) 40%, transparent);
}

body.theme-claude .profile-action-primary .fa-arrow-right {
  transition: transform 0.2s ease;
}

body.theme-claude .profile-action-primary:hover .fa-arrow-right {
  transform: translateX(3px);
}

/* 状态徽章：玉色胶囊更柔和 */
body.theme-claude .profile-status {
  border-radius: 999px;
  padding: 7px 14px;
}

/* 简介左侧玉色细线：与印章呼应，稍作加强 */
body.theme-claude .intro-copy::before {
  border-radius: 3px;
  opacity: 0.55;
  width: 3px;
}

/* ---------- 页脚 ---------- */

body.theme-claude .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  justify-content: center;
  margin-bottom: 18px;
}

body.theme-claude .footer-links a {
  color: var(--claude-secondary);
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.18s ease;
}

body.theme-claude .footer-links a:hover {
  color: var(--claude-accent);
}

/* 发夹线上的玉色菱形饰件 */
body.theme-claude .site-footer p {
  position: relative;
}

body.theme-claude .site-footer p::before {
  background: var(--claude-jade);
  content: "";
  height: 7px;
  left: 50%;
  opacity: 0.75;
  position: absolute;
  top: -4.5px;
  transform: translateX(-50%) rotate(45deg);
  width: 7px;
}

/* ---------- 页面 Hero 照片：圆角统一 ---------- */

body.theme-claude .teaching-hero-photo img,
body.theme-claude .talks-hero-photo img,
body.theme-claude .publications-hero-photo img,
body.theme-claude .cv-hero-photo img {
  border-radius: 12px;
}

/* ---------- 移动端微调 ---------- */

@media (max-width: 640px) {
  body.theme-claude .timeline-item {
    padding: 15px 16px 13px;
  }

  body.theme-claude .section-title,
  body.theme-claude .section.is-collapsible .section-title {
    font-size: 18px;
    padding-right: 28px;
  }
}

/* ---------- 减少动态偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  body.theme-claude .image.avatar img,
  body.theme-claude .social-icons a,
  body.theme-claude .timeline-item,
  body.theme-claude .news-card,
  body.theme-claude .material-link,
  body.theme-claude .profile-action,
  body.theme-claude .research-direction,
  body.theme-claude .research-direction-icon,
  body.theme-claude .nav-left a::after {
    transition: none;
  }
}