/* ============================================================
   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(90, 80, 70, .14);
  --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;
  --section-gap:      36px;
  --panel-bg:         rgba(255, 255, 255, .52);
  --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; scroll-padding-top: 56px; }

body {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  /* Dot grid: 1px dots (sub-pixel dots often invisible on Retina) */
  background-image:
    radial-gradient(circle, var(--grid-color) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255, 255, 255, .4) 0%, transparent 260px);
  background-size: 24px 24px, 100% 100%;
  background-position: 0 0, 0 0;
  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 & Nav ---------- */
.site-header { margin-bottom: 16px; }
.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); }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 8px;
  padding: 7px 12px;
  margin-bottom: 28px;
  background: rgba(248, 247, 244, .9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.site-nav a {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 4px 7px;
  border-radius: 4px;
  transition: color .12s, background .12s;
}
.site-nav a:hover {
  color: var(--accent);
  background: rgba(255, 255, 255, .75);
  text-decoration: none;
}

/* ---------- Sections ---------- */
section { margin-bottom: var(--section-gap); }
section:last-of-type { margin-bottom: 0; }

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

/* ---------- Bio ---------- */
.bio-block { margin-bottom: 4px; }
.bio-section {
  display: flex;
  gap: 28px;
  align-items: flex-start;
  margin-bottom: 14px;
}
.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; }
.bio-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  line-height: 0;
}
.bio-badges a { line-height: 0; }
.bio-badges img {
  height: 20px;
  width: auto;
  display: block;
  border: none;
}

.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: 1.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  line-height: 1.15;
}
.section-head-link {
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 400;
}

/* ---------- Content panels (News, lists, etc.) ---------- */
.content-panel,
.news-panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px 8px;
}
.content-panel > .news-toggle,
.news-panel > .news-toggle { margin-top: 6px; }

/* ---------- News ---------- */
#news .section-title { margin-bottom: 10px; }

.news-photos {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin-bottom: 12px;
  padding-bottom: 4px;
}
.news-photos img {
  height: 88px;
  width: auto;
  border-radius: 4px;
  border: 1px solid var(--border);
  object-fit: cover;
  flex-shrink: 0;
}

.news-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.news-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 4px 6px;
  font-size: .87rem;
  line-height: 1.42;
  border-radius: 4px;
  transition: background .12s;
}
.news-item:hover { background: rgba(0, 0, 0, .035); }
.news-date {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: .64rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: .03em;
  line-height: 1.25;
  padding: 2px 6px;
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  border-radius: 3px;
}
.news-content { color: var(--text); min-width: 0; }
.news-content a { font-weight: 500; }
.news-hidden { display: none; }
.news-list.news-expanded .news-hidden { display: flex; }
.news-toggle {
  margin-top: 6px;
  width: 100%;
  background: none;
  border: none;
  border-top: 1px dashed var(--border);
  border-radius: 0;
  padding: 7px 0 2px;
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color .15s;
}
.news-toggle:hover { color: var(--accent); }

/* ---------- Date tags (shared) ---------- */
.date-tag,
.news-date,
.edu-years,
.exp-period,
.talk-date,
.h-year,
.p-year,
.svc-year {
  font-family: var(--font-mono);
  font-size: .64rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: .03em;
  line-height: 1.25;
}
.news-date,
.date-tag {
  flex-shrink: 0;
  padding: 2px 6px;
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  border-radius: 3px;
}
.edu-years,
.exp-period,
.talk-date,
.h-year,
.p-year,
.svc-year {
  color: var(--text-light);
  letter-spacing: .04em;
}

/* ---------- Publications ---------- */
.pub-featured {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}
.pub-featured-item {
  flex: 1;
  min-width: 0;
  text-decoration: none;
  color: var(--text);
}
.pub-featured-item:hover { text-decoration: none; }
.pub-featured-item:hover .pub-featured-label { color: var(--accent); }
.pub-featured-media {
  width: 100%;
  height: 140px;
  overflow: hidden;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--tag-bg);
}
.pub-featured-media img,
.pub-featured-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.pub-featured-label {
  margin-top: 8px;
  font-size: .88rem;
  font-weight: 600;
  text-align: center;
  line-height: 1.35;
}

.pub-list { list-style: none; }
.pub-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.content-panel .pub-item {
  padding: 12px 6px;
  border-bottom: none;
  border-radius: 4px;
  transition: background .12s;
}
.content-panel .pub-item:hover { background: rgba(0, 0, 0, .035); }
.content-panel .pub-item:first-child { border-top: none; }
.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: 76px 25% 1fr;
  gap: 0 12px;
  padding: 12px 6px;
  border-bottom: 1px solid var(--border);
  align-items: center;
}
.content-panel .edu-item {
  border-bottom: none;
  padding: 10px 6px;
  border-radius: 4px;
  transition: background .12s;
}
.content-panel .edu-item:hover { background: rgba(0, 0, 0, .035); }
.edu-item:first-child { border-top: 1px solid var(--border); }
.content-panel .edu-item:first-child { border-top: none; }
.edu-years { padding-top: 3px; line-height: 1.45; }
/* .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 12px;
  padding: 12px 6px;
  border-bottom: 1px solid var(--border);
  align-items: center;
}
.content-panel .exp-item {
  border-bottom: none;
  padding: 10px 6px;
  border-radius: 4px;
  transition: background .12s;
}
.content-panel .exp-item:hover { background: rgba(0, 0, 0, .035); }
.exp-item:first-child { border-top: 1px solid var(--border); }
.content-panel .exp-item:first-child { border-top: none; }

.exp-period { line-height: 1.45; }

.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(230px, 1fr));
  gap: 12px;
}
.honor-card {
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: var(--panel-bg);
  transition: box-shadow .15s, transform .15s;
}
.honor-card:hover {
  box-shadow: 0 2px 10px rgba(0, 0, 0, .06);
  transform: translateY(-1px);
}
/* Honor card image: full image visible, no crop */
.honor-card-media {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 140px;
  max-height: 220px;
  padding: 10px 8px;
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.honor-card-img {
  width: auto;
  max-width: 100%;
  max-height: 200px;
  height: auto;
  object-fit: contain;
  object-position: center;
  display: block;
}

.honor-card-body { padding: 10px 12px; }
.honor-card .award-name { font-size: .86rem; font-weight: 600; line-height: 1.38; }
.honor-card .award-event { font-size: .77rem; color: var(--text-muted); margin-top: 2px; line-height: 1.35; }

/* Honors "other" list */
.honors-other { list-style: none; }
.honors-other li.honors-hidden { display: none; }
.honors-other.honors-expanded .honors-hidden { display: flex; }
.honors-other li {
  padding: 4px 6px;
  font-size: .87rem;
  display: flex;
  align-items: baseline;
  gap: 10px;
  border-radius: 4px;
  transition: background .12s;
}
.honors-other li:hover { background: rgba(0, 0, 0, .035); }
.honors-other .h-year { flex-shrink: 0; width: 40px; padding-top: 2px; }

/* ---------- Invited Talks ---------- */
.talks-list { list-style: none; }
.talk-group { margin-bottom: 14px; }
.talk-topic { font-size: .94rem; font-weight: 600; margin-bottom: 6px; line-height: 1.4; }
.talk-entries { list-style: none; }
.talk-entry {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 4px 6px;
  font-size: .87rem;
  line-height: 1.42;
  border-radius: 4px;
  transition: background .12s;
}
.talk-entry:hover { background: rgba(0, 0, 0, .035); }
.talk-date { flex-shrink: 0; padding: 2px 6px; background: var(--tag-bg); border: 1px solid var(--tag-border); border-radius: 3px; color: var(--text-muted); }
.talk-desc { color: var(--text-muted); min-width: 0; }
.talk-desc strong { color: var(--text); }

/* ---------- Programming Awards ---------- */
.prog-list { list-style: none; }
.prog-item {
  padding: 12px 6px;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 125px 1fr;
  gap: 0 12px;
  align-items: start;
}
.content-panel .prog-item { border-bottom: none; }
.prog-item:first-child { border-top: 1px solid var(--border); }
.content-panel .prog-item:first-child { border-top: none; }
.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: 0; }
.prog-more li {
  padding: 4px 6px;
  font-size: .87rem;
  display: flex;
  align-items: baseline;
  gap: 10px;
  border-radius: 4px;
  transition: background .12s;
}
.prog-more li:hover { background: rgba(0, 0, 0, .035); }
.prog-more .p-year { flex-shrink: 0; width: 40px; padding-top: 2px; }

/* ---------- Open Source ---------- */
.oss-list { list-style: none; }
.oss-item {
  display: flex;
  gap: 16px;
  padding: 14px 6px;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}
.content-panel .oss-item { border-bottom: none; border-radius: 4px; transition: background .12s; }
.content-panel .oss-item:hover { background: rgba(0, 0, 0, .035); }
.oss-item:first-child { border-top: 1px solid var(--border); }
.content-panel .oss-item:first-child { border-top: none; }
/* 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 12px;
  padding: 12px 6px;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.content-panel .svc-item { border-bottom: none; border-radius: 4px; transition: background .12s; }
.content-panel .svc-item:hover { background: rgba(0, 0, 0, .035); }
.svc-item:first-child { border-top: 1px solid var(--border); }
.content-panel .svc-item:first-child { border-top: none; }
.svc-year { 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: 10px; }
.svc-misc li {
  padding: 6px 6px;
  font-size: .87rem;
  display: flex;
  gap: 12px;
  border-radius: 4px;
  transition: background .12s;
}
.svc-misc li:hover { background: rgba(0, 0, 0, .035); }
.svc-misc li:first-child { border-top: none; }
.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: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--text-light);
  text-align: center;
  line-height: 1.6;
}
.site-footer p { margin-bottom: 8px; }
.site-footer img { height: 20px; vertical-align: middle; }

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

@media (max-width: 700px) {
  .container { padding: 36px 18px 60px; }
  html { scroll-padding-top: 48px; }
  .site-header h1 { font-size: 2.6rem; }
  .site-nav { gap: 3px 6px; padding: 6px 8px; }
  .site-nav a { font-size: .66rem; padding: 3px 5px; }
  .bio-section { flex-direction: column; align-items: center; text-align: center; }
  .bio-badges { justify-content: center; }
  .social-links { justify-content: center; }

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

  .pub-featured { flex-direction: column; }
  .pub-featured-media { height: 160px; }

  /* 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 { flex-direction: column; align-items: flex-start; gap: 3px; padding: 5px 6px; }
  .news-list.news-expanded .news-hidden { flex-direction: column; align-items: flex-start; }
  .entrep-grid { grid-template-columns: 1fr; }
  .talk-entry, .prog-item { grid-template-columns: 1fr; }
}
@media (max-width: 400px) {
  .honors-grid { grid-template-columns: 1fr; }
}