/* ============================================================
   Academic Homepage — Minimal Handwritten Style
   Inspired by Ying Xiao's homepage design
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Caveat:wght@400;600;700&family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,600;1,8..60,300;1,8..60,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --bg:               #f8f7f4;
  --grid-color:       rgba(0,0,0,.055);
  --text:             #1a1a1a;
  --text-muted:       #666;
  --text-light:       #999;
  --accent:           #2563eb;
  --accent-hover:     #1d4ed8;
  --highlight-bg:     #fef9c3;
  --highlight-border: #f59e0b;
  --border:           #d4d0c8;
  --tag-bg:           #f0ede8;
  --tag-border:       #d4d0c8;
  --award-color:      #b45309;
  --max-width:        920px;
  --font-serif:       'Source Serif 4', Georgia, serif;
  --font-hand:        'Caveat', cursive;
  --font-mono:        'JetBrains Mono', 'Courier New', monospace;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 28px 28px;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 32px 80px;
}

/* ---------- Header ---------- */
.site-header { margin-bottom: 36px; }
.site-header h1 {
  font-family: var(--font-hand);
  font-size: 3.4rem;
  font-weight: 700;
  letter-spacing: -.5px;
  line-height: 1.1;
  margin-bottom: 10px;
}
.site-header .tagline {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--text-muted);
  letter-spacing: .02em;
  line-height: 1.8;
}
.site-header .tagline span { margin: 0 6px; color: var(--text-light); }

/* ---------- Divider ---------- */
hr.section-divider { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
hr.unseen-section-divider { border: none; margin: 28px 0; }

/* ---------- Bio ---------- */
.bio-section {
  display: flex;
  gap: 28px;
  align-items: flex-start;
  margin-bottom: 24px;
}
.bio-avatar { flex-shrink: 0; }
.bio-avatar img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  display: block;
}
.avatar-placeholder {
  width: 120px; height: 120px; border-radius: 50%;
  border: 2px solid var(--border); background: var(--tag-bg);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-hand); font-size: 2rem; color: var(--text-muted);
}
.bio-text p { margin-bottom: 12px; font-size: .96rem; }
.bio-text p:last-child { margin-bottom: 0; }

.highlight-box {
  background: var(--highlight-bg);
  border-left: 3.5px solid var(--highlight-border);
  padding: 12px 16px;
  border-radius: 2px;
  font-size: .93rem;
  font-weight: 600;
  color: #78350f;
  margin-top: 14px;
  line-height: 1.6;
}

/* ---------- Social Links ---------- */
.social-links { display: flex; flex-wrap: wrap; gap: 9px; margin: 4px 0; }
.social-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 14px;
  border: 1.5px solid var(--border); border-radius: 4px;
  font-family: var(--font-mono); font-size: .76rem;
  color: var(--text); background: rgba(255,255,255,.6);
  transition: border-color .15s, background .15s, color .15s;
  text-decoration: none; letter-spacing: .01em;
}
.social-btn:hover { border-color: var(--accent); color: var(--accent); background: rgba(255,255,255,.9); text-decoration: none; }
.social-btn img { width: 15px; height: 15px; object-fit: contain; flex-shrink: 0; }

/* ---------- Section Headings ---------- */
.section-title {
  font-family: var(--font-hand);
  font-size: 2rem; font-weight: 700;
  color: var(--text); margin-bottom: 20px; line-height: 1.1;
}

/* ---------- News ---------- */
.news-photos {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin-bottom: 18px;
  padding-bottom: 4px;
}
.news-photos img {
  height: 100px;       /* fixed height, natural width */
  width: auto;
  border-radius: 4px;
  border: 1px solid var(--border);
  object-fit: cover;
  flex-shrink: 0;
}

.news-list { list-style: none; }
.news-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 0 18px;
  padding: 13px 0;
  border-bottom: 1px solid var(--border);
  font-size: .93rem;
}
.news-item:first-child { border-top: 1px solid var(--border); }
.news-date {
  font-family: var(--font-mono); font-size: .71rem;
  color: var(--text-light); letter-spacing: .06em;
  text-transform: uppercase; padding-top: 2px;
}
.news-content { color: var(--text); line-height: 1.6; }
.news-hidden { display: none; }
.news-toggle {
  margin-top: 12px;
  background: none; border: 1.5px solid var(--border); border-radius: 4px;
  padding: 6px 16px; font-family: var(--font-mono); font-size: .74rem;
  color: var(--text-muted); cursor: pointer;
  transition: border-color .15s, color .15s;
}
.news-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Publications ---------- */
.pub-list { list-style: none; }
.pub-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.pub-item:first-child { border-top: 1px solid var(--border); }

/* Thumbnail: fixed width, natural height (preserves aspect ratio) */
.pub-thumb {
  flex-shrink: 0;
  width: 200px;
}

/* img 和 video 共用同样布局 */
.pub-thumb img,
.pub-thumb video {
  width: 200px;        /* fixed width */
  height: auto;        /* natural height — no cropping */
  display: block;
  border-radius: 5px;
  border: 1px solid var(--border);
  transition: transform .3s ease;
}

/* hover 效果也共用 */
.pub-thumb img:hover,
.pub-thumb video:hover {
  transform: scale(1.03);
}

.pub-thumb-placeholder {
  width: 200px;
  height: 112px;       /* fallback only */
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--tag-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: .65rem;
  color: var(--text-light);
  text-align: center;
  padding: 8px;
}

.pub-body { display: flex; flex-direction: column; gap: 5px; flex: 1; min-width: 0; }
.pub-title { font-size: .97rem; font-weight: 600; color: var(--text); line-height: 1.5; }
.pub-title a { color: var(--text); }
.pub-title a:hover { color: var(--accent); text-decoration: none; }
.pub-authors { font-size: .85rem; color: var(--text-muted); line-height: 1.55; }
.pub-authors .self {
  color: var(--text); font-weight: 600;
  text-decoration: underline; text-decoration-style: dotted;
}
.pub-venue { font-size: .87rem; font-style: italic; color: var(--text-muted); }
.pub-venue .venue-name { font-weight: 600; font-style: normal; color: var(--text); }
.pub-award { font-size: .82rem; color: var(--award-color); font-weight: 600; }
.pub-links { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.pub-link {
  font-family: var(--font-mono); font-size: .71rem;
  padding: 3px 10px; border: 1px solid var(--tag-border); border-radius: 3px;
  color: var(--text-muted); background: var(--tag-bg);
  transition: border-color .15s, color .15s; text-decoration: none;
}
.pub-link:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* ---------- Education ---------- */
.edu-list { list-style: none; }
.edu-item {
  display: grid;
  grid-template-columns: 80px 25% 1fr;
  gap: 0 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  align-items: center;
}
.edu-item:first-child { border-top: 1px solid var(--border); }
.edu-years { font-family: var(--font-mono); font-size: .71rem; color: var(--text-light); letter-spacing: .04em; padding-top: 3px; line-height: 1.5; }
/* .edu-logo { width: 80%; object-fit: contain; border-radius: 4px; margin-top: 2px; } */
.edu-content .school { font-size: .97rem; font-weight: 600; }
.edu-content .dept { font-size: .86rem; color: var(--text-muted); }
.edu-content .degree { font-size: .86rem; color: var(--text-muted); font-style: italic; }
.edu-logo {
  width: 80%;
  object-fit: contain;
  border-radius: 4px;
  margin-top: 2px;
  display: block;
  justify-self: center;
}

/* ---------- Entrepreneurship ---------- */
.entrep-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 0;
}
.entrep-card {
  border: 1.5px solid var(--border);
  border-radius: 6px;
  padding: 16px 18px;
  background: rgba(255,255,255,.5);
}
.entrep-card .org-name { font-size: .97rem; font-weight: 600; margin-bottom: 4px; }
.entrep-card .org-desc { font-size: .87rem; color: var(--text-muted); line-height: 1.55; }

.hiring-box {
  margin-top: 14px;
  background: #eff6ff;
  border-left: 3.5px solid var(--accent);
  padding: 12px 16px;
  border-radius: 2px;
  font-size: .9rem;
  line-height: 1.65;
  color: #1e3a5f;
}

/* ---------- Experience ---------- */
.exp-list { list-style: none; }

.exp-item {
  display: grid;
  grid-template-columns: 5% 30% 1fr;
  gap: 0 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  align-items: center;
}

.exp-item:first-child { border-top: 1px solid var(--border); }

.exp-period {
  font-family: var(--font-mono);
  font-size: .71rem;
  color: var(--text-light);
  letter-spacing: .04em;
  line-height: 1.5;
}

.exp-logo {
  width: 80%;
  object-fit: contain;
  border-radius: 4px;
  margin-top: 2px;
  display: block;
  justify-self: center;
}

.exp-content .org {
  font-size: .97rem;
  font-weight: 600;
}

.exp-content .role {
  font-size: .87rem;
  color: var(--text-muted);
}

/* ---------- Honors ---------- */
.honors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 14px;
}
.honor-card {
  border: 1.5px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: rgba(255,255,255,.5);
}
/* Honor card image: fixed width, natural height */
.honor-card-img {
  width: 100%;
  height: 200px;       /* 统一最大高度，超出裁剪 */
  object-fit: cover;   /* 保持比例居中裁剪，不变形 */
  object-position: top center; /* 从顶部开始裁，保留证书标题 */
  display: block;
  border-bottom: 1px solid var(--border);
}

.honor-card-body { padding: 11px 14px; }
.honor-card .award-name { font-size: .88rem; font-weight: 600; line-height: 1.4; }
.honor-card .award-event { font-size: .79rem; color: var(--text-muted); margin-top: 2px; }

/* Honors "other" list */
.honors-other li.honors-hidden { display: none; }
.honors-other li {
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
  font-size: .9rem;
  display: flex;
  gap: 14px;
}
.honors-other li:first-child { border-top: 1px solid var(--border); }
.honors-other .h-year { font-family: var(--font-mono); font-size: .71rem; color: var(--text-light); flex-shrink: 0; padding-top: 2px; width: 44px; }

/* ---------- Invited Talks ---------- */
.talks-list { list-style: none; }
.talk-group { margin-bottom: 20px; }
.talk-topic { font-size: .97rem; font-weight: 600; margin-bottom: 8px; }
.talk-entries { list-style: none; }
.talk-entry {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 0 14px;
  padding: 7px 0;
  border-bottom: 1px dashed var(--border);
  font-size: .88rem;
}
.talk-entry:last-child { border-bottom: none; }
.talk-date { font-family: var(--font-mono); font-size: .71rem; color: var(--text-light); padding-top: 2px; }
.talk-desc { color: var(--text-muted); }
.talk-desc strong { color: var(--text); }

/* ---------- Programming Awards ---------- */
.prog-list { list-style: none; }
.prog-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 125px 1fr;
  gap: 0 14px;
  align-items: start;
}
.prog-item:first-child { border-top: 1px solid var(--border); }
.prog-logo { width: 120px; object-fit: cover; border-radius: 4px; border: 1px solid var(--border); }
.prog-content .comp-name { font-size: .95rem; font-weight: 600; }
.prog-content .comp-result { font-size: .87rem; color: var(--award-color); font-weight: 600; }
.prog-content .comp-detail { font-size: .84rem; color: var(--text-muted); }

.prog-more { list-style: none; margin-top: 12px; }
.prog-more li {
  padding: 7px 0;
  border-bottom: 1px dashed var(--border);
  font-size: .88rem;
  display: flex; gap: 12px;
}
.prog-more li:first-child { border-top: 1px dashed var(--border); }
.prog-more .p-year { font-family: var(--font-mono); font-size: .71rem; color: var(--text-light); flex-shrink: 0; width: 44px; padding-top: 2px; }

/* ---------- Open Source ---------- */
.oss-list { list-style: none; }
.oss-item {
  display: flex;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}
.oss-item:first-child { border-top: 1px solid var(--border); }
/* OSS thumbnail: fixed width, natural height */
.oss-thumb {
  flex-shrink: 0;
  width: 200px;
}
.oss-thumb img {
  width: 200px;
  height: auto;        /* natural height */
  display: block;
  border-radius: 5px;
  /* border: 1px solid var(--border); */
}
.oss-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.oss-body .proj-name { font-size: .97rem; font-weight: 600; }
.oss-body .proj-desc { font-size: .87rem; color: var(--text-muted); }
.oss-body .proj-meta { font-family: var(--font-mono); font-size: .74rem; color: var(--text-light); margin-top: 4px; }

/* ---------- Academic Services ---------- */
.svc-list { list-style: none; }
.svc-item {
  display: grid;
  grid-template-columns: 5% 20% 1fr;
  gap: 0 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.svc-item:first-child { border-top: 1px solid var(--border); }
.svc-year { font-family: var(--font-mono); font-size: .71rem; color: var(--text-light); letter-spacing: .04em; padding-top: 3px; }
/* Service thumbnail: fixed width, natural height */
.svc-thumb {
  width: 90%;
  margin-left: 5%;
  height: auto;
  object-fit: contain;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--tag-bg);
  margin-top: 2px;
}
.svc-content .svc-name { font-size: .97rem; font-weight: 600; }
.svc-content .svc-role { font-size: .87rem; color: var(--text-muted); }
.svc-content .svc-desc { font-size: .84rem; color: var(--text-muted); margin-top: 4px; line-height: 1.55; }

.svc-misc { list-style: none; margin-top: 14px; }
.svc-misc li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
  font-size: .88rem;
  display: flex; gap: 12px;
}
.svc-misc li:first-child { border-top: 1px dashed var(--border); }
.svc-misc .sm-label { font-family: var(--font-mono); font-size: .71rem; color: var(--text-light); flex-shrink: 0; width: 64px; padding-top: 2px; }

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 60px; padding-top: 24px;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono); font-size: .72rem;
  color: var(--text-light); text-align: center;
}

/* ---------- Responsive ---------- */

@media (max-width: 700px) {
  .container { padding: 36px 18px 60px; }
  .site-header h1 { font-size: 2.6rem; }
  .bio-section { flex-direction: column; align-items: center; text-align: center; }
  .social-links { justify-content: center; }

  .pub-item { flex-direction: column; }

  /* 手机端 img 和 video 都变成 100% */
  .pub-thumb,
  .pub-thumb img,
  .pub-thumb video {
    width: 100%;
  }

  .edu-item, .exp-item, .svc-item { grid-template-columns: 64px 1fr; }
  .edu-logo, .exp-logo, .svc-thumb { display: none; }

  .oss-item { flex-direction: column; }
  .oss-thumb, .oss-thumb img { width: 100%; }

  .honors-grid { grid-template-columns: 1fr 1fr; }
  .news-item { grid-template-columns: 1fr; gap: 3px; }
  .entrep-grid { grid-template-columns: 1fr; }
  .talk-entry, .prog-item { grid-template-columns: 1fr; }
}
@media (max-width: 400px) {
  .honors-grid { grid-template-columns: 1fr; }
}