/* ============================================================
   学术极简个人主页 · 样式表
   主题配色集中在 :root 变量中，改这两块即可整体换肤
   ============================================================ */

:root {
  --bg: #fbfbfa;               /* 页面底色 */
  --surface: #ffffff;          /* 卡片 / 标签底色 */
  --text: #23262b;             /* 正文 */
  --muted: #6b7280;            /* 次要文字 */
  --accent: #2f5d8f;            /* 强调色（链接、高亮） */
  --accent-hover: #24486e;
  --hairline: #e7e4de;         /* 细分隔线 */
  --photo-bg: #ecebe7;

  --serif: Georgia, "Songti SC", "Noto Serif SC", "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
  --bg: #16181c;
  --surface: #1e2126;
  --text: #d6d9de;
  --muted: #9aa1ab;
  --accent: #85abd4;
  --accent-hover: #a3c3e6;
  --hairline: #2c3036;
  --photo-bg: #262a30;
}

/* ---------- 基础 ---------- */

* { box-sizing: border-box; }

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.78;
  transition: background-color .25s ease, color .25s ease;
}

::selection { background: color-mix(in srgb, var(--accent) 22%, transparent); }

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
a:hover { color: var(--accent-hover); text-decoration-color: currentColor; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* 顶部导航（吸顶） */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--hairline);
}

.nav-inner {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 3.4rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--sans);
}

.nav-name {
  font-weight: 600;
  font-size: .95rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: .02em;
  white-space: nowrap;
}
.nav-name:hover { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 1.1rem;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  font-size: .85rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .15s ease;
}
.nav-links a:hover,
.nav-links a.active { color: var(--accent); }

.theme-toggle {
  flex: none;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  transition: color .15s ease, border-color .15s ease;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }

.icon { display: block; }
.icon-sun { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* 跳转链接（无障碍） */
.skip-link {
  position: absolute;
  left: -999px;
  top: .5rem;
  z-index: 100;
  padding: .5rem .9rem;
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 4px;
  font-family: var(--sans);
  font-size: .85rem;
}
.skip-link:focus { left: .75rem; }

/* ---------- 版式 ---------- */

.container {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section { margin-top: 3.75rem; scroll-margin-top: 4.5rem; }

.section-title {
  font-family: var(--sans);
  font-size: .74rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .16em;
  color: var(--muted);
  margin: 2.2rem 0 1.4rem;
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--hairline);
}

/* 区块内第一个标题不额外加顶部间距（section 本身已有外距） */
.section-title:first-child { margin-top: 0; }

.prose p { margin: 0 0 1rem; }
.prose p:last-child { margin-bottom: 0; }
.muted-note { color: var(--muted); font-size: .95rem; }

/* ---------- 头部（关于） ---------- */

.hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;  /* 文字居左，照片右缘与文字列右缘对齐 */
  gap: 2.25rem;
  margin-top: 3.25rem;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: .01em;
  margin: 0 0 .35rem;
}

.hero-title {
  font-family: var(--sans);
  font-size: .95rem;
  color: var(--text);
  margin: 0 0 .3rem;
}

.hero-affil {
  font-family: var(--sans);
  font-size: .88rem;
  color: var(--muted);
  margin: 0 0 1.1rem;
  line-height: 1.6;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem 1rem;
  font-family: var(--sans);
  font-size: .88rem;
}

/* 图标链接（页头 Email / GitHub） */
.icon-link {
  display: inline-flex;
  align-items: center;
  padding: .15rem;
  color: var(--muted);
  text-decoration: none;
  transition: color .15s ease;
}
.icon-link:hover { color: var(--accent); }
.icon-link svg { display: block; }

/* 机构标（经历区右侧，透明底黑色标志；深色主题下反色为白色） */
.exp-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;  /* 标题居左，logo 右缘与文字列右缘对齐 */
  gap: 1rem;
}

.org-logo {
  flex: none;
  /* Z_black.svg 的 viewBox(300×300) 内标志仅占约 2/3，适当放大显示高度补偿 */
  height: 2.6rem;
  width: auto;
  margin-top: .15rem;
}
[data-theme="dark"] .org-logo { filter: invert(1); }

/* 原比例显示、不做裁剪；原图为 assets/intro.jpg，换照片直接覆盖该文件 */
.photo {
  flex: none;
  width: 12rem;
  height: auto;
  border-radius: 8px;
  display: block;
}

.bio { margin-top: 2rem; }

/* ---------- 研究兴趣标签 ---------- */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
}

.chip {
  font-family: var(--sans);
  font-size: .84rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: .32rem .85rem;
}

/* ---------- 动态 ---------- */

.news-item {
  display: grid;
  grid-template-columns: 5.2rem 1fr;
  gap: 1.1rem;
  padding: .32rem 0;
}

.news-date {
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  padding-top: .28rem;
  white-space: nowrap;
}

.news-text { margin: 0; font-size: 1rem; }

.badge-new {
  display: inline-block;
  vertical-align: 2px;
  margin-left: .4rem;
  padding: 0 .45rem;
  font-family: var(--sans);
  font-size: .68rem;
  line-height: 1.5;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  border-radius: 999px;
}

/* ---------- 论文 ---------- */

.pub {
  display: flex;
  gap: .8rem;
  margin-bottom: 2.1rem;
}
.pub:last-child { margin-bottom: 0; }

.pub-num {
  flex: none;
  width: 2rem;
  font-family: var(--sans);
  font-size: .84rem;
  color: var(--muted);
  padding-top: .3rem;
  font-variant-numeric: tabular-nums;
}

.pub-title {
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 0 0 .3rem;
}

.pub-title a { color: var(--text); text-decoration: none; }
.pub-title a:hover { color: var(--accent); }

.pub-authors {
  margin: 0 0 .25rem;
  font-size: .98rem;
  color: var(--text);
}
.pub-authors sup { font-size: .7em; }

.pub-venue {
  margin: 0 0 .45rem;
  font-size: .95rem;
  color: var(--muted);
}

.pub-tag {
  display: inline-block;
  vertical-align: 2px;
  margin-left: .45rem;
  padding: 0 .5rem;
  font-family: var(--sans);
  font-size: .68rem;
  line-height: 1.55;
  color: var(--muted);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  background: var(--surface);
}
.pub-tag-award { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.pub-tag-note { font-style: normal; color: var(--muted); background: color-mix(in srgb, var(--muted) 8%, transparent); }

.pub-links {
  margin: 0;
  font-family: var(--sans);
  font-size: .86rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
}
.pub-links > span { color: var(--muted); }

.toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--muted);
  background: none;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: .12rem .65rem;
  cursor: pointer;
  transition: color .15s ease, border-color .15s ease;
}
.toggle-btn:hover { color: var(--accent); border-color: var(--accent); }
.toggle-btn .caret { display: inline-block; transition: transform .18s ease; }
.toggle-btn[aria-expanded="true"] .caret { transform: rotate(180deg); }

.pub-abstract {
  margin-top: .8rem;
  padding: .15rem 0 .15rem 1rem;
  border-left: 2px solid var(--hairline);
  font-size: .95rem;
  color: var(--muted);
}
.pub-abstract p { margin: 0; }

.pub-bibtex {
  margin: .8rem 0 0;
  padding: .85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--muted);
  overflow-x: auto;
}
.pub-bibtex code { font: inherit; }

/* ---------- 教学 / 服务 / 联系 ---------- */

.plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.plain-list li { padding: .25rem 0; }

.item-meta {
  display: inline-block;
  min-width: 5.2rem;
  margin-right: .9rem;
  font-family: var(--sans);
  font-size: .84rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- 经历 ---------- */

.exp { margin-bottom: .4rem; }

.exp-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 .15rem;
}

.exp-meta {
  font-family: var(--sans);
  font-size: .85rem;
  color: var(--muted);
  margin: 0 0 .7rem;
}

.exp .plain-list {
  padding-left: 1.15rem;
  list-style: disc;
}
.exp .plain-list li {
  padding: .18rem 0;
  font-size: .99rem;
  color: var(--text);
}
.exp .plain-list li::marker { color: var(--muted); }

/* ---------- 页脚 ---------- */

.site-footer {
  max-width: 46rem;
  margin: 4.5rem auto 0;
  padding: 1.4rem 1.25rem 2.5rem;
  border-top: 1px solid var(--hairline);
  font-family: var(--sans);
  font-size: .84rem;
  color: var(--muted);
}
.site-footer p { margin: 0 0 .3rem; }

/* ---------- 响应式 ---------- */

@media (max-width: 620px) {
  body { font-size: 1rem; }

  /* 窄屏：隐藏导航中的姓名（与页面 h1 重复），收紧链接间距保证单行完整显示 */
  .nav-name { display: none; }
  .nav-inner { gap: .6rem; padding: 0 .85rem; }
  .nav-links { gap: .5rem; font-size: .75rem; }

  /* 窄屏：头像移到左侧，文字占满剩余宽度 */
  .hero {
    gap: 1.1rem;
    margin-top: 2.25rem;
  }
  .photo { order: -1; width: 6.5rem; height: auto; border-radius: 6px; }
  .hero h1 { font-size: 1.55rem; }

  .news-item { grid-template-columns: 4rem 1fr; gap: .8rem; }
  .item-meta { display: block; min-width: 0; margin: 0 0 .1rem; }
  .pub { gap: .55rem; }
  .pub-num { width: 1.7rem; }
}

/* ---------- 打印 ---------- */

@media print {
  .site-nav, .theme-toggle, .toggle-btn, .skip-link { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .section { margin-top: 1.8rem; }
  a { color: #000; }
}