/* ===================================================
   BING ZHOU — Academic Website CSS
   Color palette: Deep teal + warm gold + clean white
   =================================================== */

:root {
  --primary:     #1a4a5e;
  --primary-light: #2a6a85;
  --accent:      #e8a44a;
  --accent-light: #f5c978;
  --bg:          #f8f9fb;
  --card-bg:     #ffffff;
  --text:        #1d2d3a;
  --text-muted:  #6b7a8d;
  --border:      #e2e8f0;
  --gradient:    linear-gradient(135deg, #1a4a5e 0%, #2a6a85 50%, #0f3345 100%);
  --shadow-sm:   0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:   0 4px 12px rgba(0,0,0,.10), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg:   0 10px 30px rgba(0,0,0,.12), 0 4px 8px rgba(0,0,0,.08);
  --radius:      12px;
  --radius-sm:   8px;
  --transition:  0.25s ease;
  --header-h:    68px;
}

/* ── Reset ─────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--primary-light); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* ── Header ─────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--gradient);
  box-shadow: var(--shadow-md);
  height: var(--header-h);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.header-name {
  white-space: nowrap;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  letter-spacing: .5px;
  flex-shrink: 0;
}
.name-zh { font-size: .95rem; opacity: .8; }
.name-sep { margin: 0 .4rem; opacity: .5; }
.main-nav {
  display: flex;
  align-items: center;
  gap: .25rem;
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.main-nav::-webkit-scrollbar { display: none; }
.nav-link {
  color: rgba(255,255,255,.8);
  font-size: .82rem;
  font-weight: 500;
  padding: .45rem .75rem;
  border-radius: 20px;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: .35rem;
}
.nav-link i { font-size: .75rem; }
.nav-link:hover { background: rgba(255,255,255,.15); color: #fff; text-decoration: none; }
.nav-link.active { background: var(--accent); color: var(--primary); font-weight: 700; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .4rem;
  margin-left: auto;
}
.hamburger span {
  width: 24px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition);
}

/* ── Main Content ───────────────────────────── */
.main-content { flex: 1; }

/* Tab panels */
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Hero (Home) ─────────────────────────────── */
.hero-section {
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: var(--gradient);
  clip-path: ellipse(120% 80% at 50% 0%);
}
.hero-content {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 6rem;
}
.profile-card {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  background: rgba(255,255,255,.12);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  max-width: 720px;
}
.portrait-wrapper {
  position: relative;
  flex-shrink: 0;
}
.portrait {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--accent);
  position: relative;
  z-index: 1;
}
.portrait-ring {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px dashed rgba(255,255,255,.4);
  animation: spin 18s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.profile-info { color: #fff; }
.profile-name {
  font-family: 'Merriweather', serif;
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.2;
}
.pronoun {
  font-size: .85rem;
  font-weight: 400;
  font-family: 'Inter', sans-serif;
  opacity: .7;
}
.profile-title { font-size: 1.05rem; font-weight: 600; color: var(--accent-light); margin: .35rem 0 .1rem; }
.profile-dept { font-size: .9rem; opacity: .85; }
.profile-inst { font-size: .88rem; opacity: .75; margin-top: .15rem; display: flex; align-items: center; gap: .4rem; }
.profile-links { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .9rem; }
.pill-link {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.3);
  color: #fff;
  font-size: .78rem;
  padding: .3rem .75rem;
  border-radius: 20px;
  transition: background var(--transition);
}
.pill-link:hover { background: rgba(255,255,255,.3); text-decoration: none; }

/* ── Content Grid ────────────────────────────── */
.content-grid {
  max-width: 1200px;
  margin: -2.5rem auto 0;
  padding: 0 1.5rem 3rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

/* ── Cards ───────────────────────────────────── */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 1.75rem;
  border: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); }
.card.full-width { grid-column: 1 / -1; }

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: .55rem;
  margin-bottom: 1.2rem;
  padding-bottom: .65rem;
  border-bottom: 2px solid var(--border);
}
.card-title i { color: var(--accent); font-size: .9rem; }

/* ── Research Interests ──────────────────────── */
.interest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: .75rem;
}
.interest-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: .5rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: .9rem .6rem;
  font-size: .82rem;
  font-weight: 500;
  color: var(--text);
  border: 1px solid var(--border);
  transition: box-shadow var(--transition), transform var(--transition);
}
.interest-item:hover { box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.interest-icon {
  width: 40px; height: 40px;
  background: var(--primary);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  font-size: .9rem;
}
.interest-item.sm { padding: .65rem .5rem; }
.interest-icon.sm { width: 32px; height: 32px; font-size: .75rem; }

/* ── Bio ─────────────────────────────────────── */
.bio-text { font-size: .92rem; color: var(--text); margin-bottom: .75rem; line-height: 1.75; }
.bio-text:last-child { margin-bottom: 0; }

/* ── News ────────────────────────────────────── */
.news-list { list-style: none; }
.news-item {
  display: flex;
  gap: .75rem;
  align-items: flex-start;
  padding: .6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .88rem;
}
.news-item:last-child { border-bottom: none; }
.news-date {
  background: var(--primary);
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
  padding: .15rem .5rem;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: .1rem;
}

/* ── Stats ───────────────────────────────────── */
.stats-row {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 1rem;
}
.stat-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .25rem;
}
.stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  font-family: 'Merriweather', serif;
}
.stat-label { font-size: .78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .8px; }

/* ── Page Header ─────────────────────────────── */
.page-header {
  background: var(--gradient);
  padding: 2.5rem 1.5rem 3rem;
  text-align: center;
  color: #fff;
}
.page-title {
  font-family: 'Merriweather', serif;
  font-size: 2rem;
  font-weight: 700;
}
.page-subtitle {
  margin-top: .5rem;
  font-size: .9rem;
  opacity: .8;
}

/* ── Content Wrapper ─────────────────────────── */
.content-wrapper {
  max-width: 960px;
  margin: -1.5rem auto 0;
  padding: 0 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.content-wrapper.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* ── Timeline ────────────────────────────────── */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: .6rem;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--border);
}
.timeline-item {
  position: relative;
  padding: 0 0 1.5rem 1.2rem;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -1.4rem;
  top: .2rem;
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 3px solid var(--card-bg);
  box-shadow: 0 0 0 2px var(--primary);
}
.timeline-dot.phd { background: #e8a44a; }
.timeline-dot.me  { background: #2a6a85; }
.timeline-dot.be  { background: #6b9eb5; }
.timeline-dot.current { background: #27ae60; box-shadow: 0 0 0 2px #27ae60; }
.timeline-dot.past    { background: var(--text-muted); box-shadow: 0 0 0 2px var(--text-muted); }
.timeline-dot.industry { background: #9b59b6; box-shadow: 0 0 0 2px #9b59b6; }

.timeline-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: .3rem;
}
.timeline-degree { font-weight: 700; font-size: .95rem; color: var(--primary); }
.timeline-year   { font-size: .78rem; color: var(--accent); font-weight: 700; background: var(--primary); padding: .15rem .5rem; border-radius: 4px; }
.timeline-inst   { font-size: .87rem; color: var(--text-muted); margin-bottom: .3rem; display: flex; align-items: center; gap: .35rem; }
.timeline-detail { font-size: .84rem; color: var(--text); margin-bottom: .2rem; }

/* ── Awards ──────────────────────────────────── */
.awards-list { display: flex; flex-direction: column; gap: .75rem; }
.award-item { display: flex; gap: .75rem; align-items: flex-start; }
.award-year {
  background: var(--primary);
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
  padding: .2rem .5rem;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: .1rem;
}
.award-body { display: flex; flex-direction: column; gap: .15rem; font-size: .88rem; }
.award-source { color: var(--text-muted); font-size: .8rem; }

/* ── Publications ────────────────────────────── */
.pub-filter {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: .5rem;
}
.filter-btn {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: .8rem;
  font-weight: 500;
  padding: .35rem .9rem;
  border-radius: 20px;
  cursor: pointer;
  transition: all var(--transition);
}
.filter-btn.active, .filter-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.pub-year-group { display: flex; flex-direction: column; gap: .9rem; }
.pub-year {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  border-bottom: 2px solid var(--accent);
  padding-bottom: .4rem;
  display: inline-block;
  margin-bottom: .25rem;
}
.pub-card {
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  display: flex;
  gap: .9rem;
  align-items: flex-start;
  transition: box-shadow var(--transition), transform var(--transition);
}
.pub-card:hover { box-shadow: var(--shadow-sm); transform: translateX(3px); }
.pub-card.review-card { border-left: 3px solid #f39c12; }
.pub-card.prep-card   { border-left: 3px solid #27ae60; }

.pub-year-badge {
  font-size: .72rem;
  font-weight: 700;
  background: var(--primary);
  color: var(--accent);
  padding: .2rem .45rem;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: .15rem;
}
.pub-badge {
  font-size: .68rem;
  font-weight: 700;
  padding: .2rem .45rem;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}
.pub-badge.review { background: #fef3cd; color: #856404; }
.pub-badge.prep   { background: #d4edda; color: #155724; }

.pub-content { flex: 1; }
.pub-authors { font-size: .83rem; color: var(--text-muted); margin-bottom: .2rem; }
.pub-authors strong { color: var(--primary); }
.pub-title { font-size: .9rem; font-weight: 600; color: var(--text); margin-bottom: .2rem; line-height: 1.45; }
.pub-journal { font-size: .82rem; color: var(--text-muted); }
.pub-doi {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  font-size: .75rem;
  margin-top: .4rem;
  color: var(--primary-light);
  border: 1px solid var(--border);
  padding: .15rem .5rem;
  border-radius: 4px;
  transition: background var(--transition);
}
.pub-doi:hover { background: var(--primary); color: #fff; text-decoration: none; }

/* ── Teaching ────────────────────────────────── */
.teach-block { margin-bottom: 1.75rem; }
.teach-block:last-child { margin-bottom: 0; }
.teach-inst {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: .75rem;
}
.inst-badge {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: .75rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}
.inst-badge.utk  { background: #ff6600; }
.inst-badge.psu  { background: #1e407c; }
.inst-badge.tamu { background: #500000; }

.teach-inst strong { display: block; font-size: .95rem; color: var(--primary); }
.teach-role { font-size: .8rem; color: var(--text-muted); }

.course-list { display: flex; flex-direction: column; gap: .5rem; margin-left: 3.25rem; }
.course-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .5rem .75rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-size: .87rem;
  border: 1px solid var(--border);
}
.course-code { font-weight: 700; color: var(--primary); font-size: .8rem; white-space: nowrap; min-width: 90px; }
.course-name { flex: 1; color: var(--text); }
.course-term { font-size: .75rem; color: var(--text-muted); white-space: nowrap; }

.talk-list, .mentor-list { list-style: none; display: flex; flex-direction: column; gap: .75rem; }
.talk-item, .mentor-item { display: flex; gap: .75rem; font-size: .88rem; }
.talk-year, .mentor-year {
  font-weight: 700;
  color: var(--accent);
  background: var(--primary);
  font-size: .72rem;
  padding: .2rem .45rem;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: .1rem;
}
.talk-venue, .mentor-topic { display: block; font-size: .8rem; color: var(--text-muted); margin-top: .15rem; }

/* ── Funding ─────────────────────────────────── */
.funding-list { display: flex; flex-direction: column; gap: .9rem; }
.funding-item {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
}
.funding-item.pi   { border-left-color: var(--accent); }
.funding-item.copi { border-left-color: var(--primary-light); }

.funding-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: .4rem;
}
.funding-badge {
  font-size: .72rem;
  font-weight: 700;
  padding: .2rem .55rem;
  border-radius: 4px;
}
.pi-badge    { background: #fff3cd; color: #856404; }
.copi-badge  { background: #cce5ff; color: #004085; }
.collab-badge { background: #d4edda; color: #155724; }

.funding-year { font-size: .8rem; color: var(--text-muted); font-weight: 600; }
.funding-title { font-size: .9rem; font-weight: 600; color: var(--text); margin-bottom: .3rem; }
.funding-source { font-size: .82rem; color: var(--text-muted); }

/* ── Service ─────────────────────────────────── */
.review-intro { font-size: .88rem; margin-bottom: .75rem; color: var(--text); }
.journal-chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.journal-chip {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: .78rem;
  padding: .3rem .7rem;
  border-radius: 20px;
}

.review-list { list-style: none; padding-left: 1rem; display: flex; flex-direction: column; gap: .4rem; }
.review-list li { font-size: .88rem; position: relative; }
.review-list li::before { content: '›'; position: absolute; left: -1rem; color: var(--accent); font-weight: 700; }

.session-list { display: flex; flex-direction: column; gap: .75rem; }
.session-item { display: flex; gap: .75rem; font-size: .88rem; }
.session-year {
  background: var(--primary);
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
  padding: .2rem .45rem;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: .1rem;
}
.session-venue { display: block; font-size: .8rem; color: var(--text-muted); margin-top: .15rem; }

.service-list { list-style: none; display: flex; flex-direction: column; gap: .85rem; }
.service-item { display: flex; gap: .75rem; font-size: .88rem; }
.service-years {
  background: var(--primary);
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
  padding: .2rem .45rem;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: .1rem;
}
.service-detail { display: block; font-size: .8rem; color: var(--text-muted); margin-top: .15rem; }

/* ── Contact ─────────────────────────────────── */
.contact-main { grid-column: 1 / -1; }
.contact-info { display: flex; flex-direction: column; gap: 1rem; }
.contact-row { display: flex; gap: .85rem; align-items: flex-start; font-size: .9rem; }
.contact-row i { color: var(--accent); margin-top: .15rem; width: 18px; text-align: center; flex-shrink: 0; }

.social-links { display: flex; flex-direction: column; gap: .75rem; }
.social-btn {
  display: flex;
  align-items: center;
  gap: .85rem;
  padding: .85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: box-shadow var(--transition), transform var(--transition);
  color: var(--text);
  font-size: .88rem;
}
.social-btn:hover { box-shadow: var(--shadow-sm); transform: translateX(3px); text-decoration: none; }
.social-btn i { font-size: 1.15rem; width: 24px; text-align: center; flex-shrink: 0; }
.social-btn div { display: flex; flex-direction: column; gap: .1rem; }
.social-btn strong { font-size: .9rem; }
.social-btn span { font-size: .78rem; color: var(--text-muted); }
.social-btn.email   i { color: #d93025; }
.social-btn.scholar i { color: #4285f4; }
.social-btn.linkedin i { color: #0a66c2; }
.social-btn.gisphere i { color: #27ae60; }
.social-btn.github  i { color: #333; }

/* Map */
.map-wrapper { border-radius: var(--radius-sm); overflow: hidden; }

/* School logos in timeline */
.school-logo {
  display: inline-block;
  height: 28px;
  width: auto;
  object-fit: contain;
  vertical-align: middle;
  margin-right: .5rem;
  border-radius: 3px;
}

/* Teaching quote */
.teaching-quote {
  background: var(--gradient);
  color: #fff;
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  position: relative;
  box-shadow: var(--shadow-md);
}
.teaching-quote::before {
  content: '\201C';
  font-family: 'Merriweather', serif;
  font-size: 6rem;
  line-height: 1;
  color: rgba(255,255,255,.15);
  position: absolute;
  top: -.5rem;
  left: 1rem;
}
.teaching-quote p {
  font-family: 'Merriweather', serif;
  font-size: 1.05rem;
  font-style: italic;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}
.teaching-quote cite {
  display: block;
  margin-top: 1rem;
  font-style: normal;
  font-size: .85rem;
  font-weight: 600;
  color: var(--accent-light);
  letter-spacing: .5px;
}

/* Contact form */
.contact-form { display: flex; flex-direction: column; gap: 1rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { display: flex; flex-direction: column; gap: .35rem; }
.form-group label { font-size: .83rem; font-weight: 600; color: var(--primary); }
.form-group input, .form-group textarea {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .6rem .85rem;
  font-size: .9rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(42,106,133,.15);
}
.form-group textarea { resize: vertical; }

.submit-btn {
  align-self: flex-start;
  background: var(--primary);
  color: #fff;
  border: none;
  font-size: .9rem;
  font-weight: 600;
  font-family: inherit;
  padding: .65rem 1.6rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: .5rem;
  transition: background var(--transition), transform var(--transition);
}
.submit-btn:hover { background: var(--primary-light); transform: translateY(-1px); }
.form-status { font-size: .85rem; color: #27ae60; }

/* ── Footer ──────────────────────────────────── */
.site-footer {
  background: var(--primary);
  color: rgba(255,255,255,.65);
  text-align: center;
  padding: 1.25rem 1rem;
  font-size: .8rem;
}
.site-footer a { color: var(--accent-light); }

/* ── Responsive ──────────────────────────────── */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .main-nav {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--primary);
    flex-direction: column;
    align-items: stretch;
    padding: .75rem;
    gap: .25rem;
    display: none;
    box-shadow: var(--shadow-md);
    z-index: 99;
  }
  .main-nav.open { display: flex; }
  .nav-link { border-radius: 8px; padding: .6rem 1rem; }

  .profile-card {
    flex-direction: column;
    text-align: center;
    padding: 1.5rem;
    gap: 1.25rem;
  }
  .profile-links { justify-content: center; }

  .content-grid { grid-template-columns: 1fr; }
  .content-wrapper.contact-grid { grid-template-columns: 1fr; }
  .contact-main { grid-column: 1; }
  .form-row { grid-template-columns: 1fr; }

  .stats-row { gap: 1.5rem; }
  .page-title { font-size: 1.5rem; }
  .profile-name { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .header-name .name-zh, .header-name .name-sep { display: none; }
  .course-item { flex-wrap: wrap; }
  .course-code { min-width: unset; }
}

/* ════════════════════════════════════════════════
   MYSTERY CONTENTS — AAG 2026 Poster
   ════════════════════════════════════════════════ */

/* Nav sparkle */
.nav-mystery { border: 1px solid rgba(255,215,0,.45) !important; }
.nav-mystery.active { background: linear-gradient(135deg,#f5a623,#f0c040) !important; color: #1a2a1a !important; }

/* Hero */
.aag-hero {
  position: relative;
  overflow: hidden;
  background: #0b1a2e;
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.aag-hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 50%, rgba(30,90,160,.55) 0%, transparent 70%),
    radial-gradient(ellipse 60% 80% at 80% 30%, rgba(200,130,20,.3) 0%, transparent 65%),
    linear-gradient(160deg, #0b1a2e 0%, #0e2a44 50%, #0d1f38 100%);
}
/* Decorative floating circles */
.aag-deco {
  position: absolute;
  border-radius: 50%;
  opacity: .12;
  background: conic-gradient(from 0deg, #e8a44a, #2a6a85, #e8a44a);
  animation: aag-spin 20s linear infinite;
}
.aag-deco-1 { width: 420px; height: 420px; top: -140px; right: -100px; }
.aag-deco-2 { width: 260px; height: 260px; bottom: -80px; left: 5%; animation-duration: 30s; animation-direction: reverse; }
.aag-deco-3 { width: 140px; height: 140px; top: 30%; left: 38%; opacity: .07; animation-duration: 14s; }
@keyframes aag-spin { to { transform: rotate(360deg); } }

/* Grid of dots overlay */
.aag-hero-bg::after {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 28px 28px;
}

.aag-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 3rem 1.5rem 2.5rem;
  color: #fff;
}
.aag-conf-label {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: rgba(255,255,255,.6);
  margin-bottom: .75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
}
.aag-conf-title {
  font-family: 'Merriweather', serif;
  font-size: 4.5rem;
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, #f5c978 0%, #fff 40%, #e8a44a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: .6rem;
  letter-spacing: -2px;
}
.aag-conf-location {
  font-size: .95rem;
  color: rgba(255,255,255,.75);
  margin-bottom: 1.5rem;
  letter-spacing: .5px;
}
.aag-legend {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  justify-content: center;
}

/* Role pills */
.aag-role-pill {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  padding: .25rem .75rem;
  border-radius: 20px;
  letter-spacing: .5px;
  text-transform: uppercase;
  flex-shrink: 0;
}
.aag-role-pill.chair     { background: #f5c938; color: #3a2800; }
.aag-role-pill.organizer { background: #2dd4a0; color: #00301e; }
.aag-role-pill.presenter { background: #ff7c50; color: #3d1200; }
.aag-role-pill.coauthor  { background: #a78bfa; color: #1e0050; }

/* Body */
.aag-body {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3.5rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* Day block */
.aag-day-block {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.5rem;
  align-items: start;
}
.aag-day-label {
  position: sticky;
  top: calc(var(--header-h) + 1rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #0b1a2e;
  border-radius: 12px;
  padding: 1rem .75rem;
  color: #fff;
  text-align: center;
  box-shadow: 0 4px 16px rgba(0,0,0,.4);
  border: 1px solid rgba(255,255,255,.08);
}
.aag-day-name {
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: #e8a44a;
  margin-bottom: .25rem;
}
.aag-day-date {
  font-family: 'Merriweather', serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
}

/* Sessions column */
.aag-sessions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Session card */
.aag-card {
  display: flex;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,.07), 0 1px 3px rgba(0,0,0,.05);
  border: 1px solid #e2e8f0;
  transition: transform .22s ease, box-shadow .22s ease;
}
.aag-card:hover {
  transform: translateY(-3px) translateX(2px);
  box-shadow: 0 10px 28px rgba(0,0,0,.12);
}
.aag-card.featured {
  border: 1.5px solid transparent;
  background: linear-gradient(#fff, #fff) padding-box,
              linear-gradient(135deg, #e8a44a, #2a6a85) border-box;
  box-shadow: 0 4px 18px rgba(42,106,133,.15);
}

/* Left accent stripe */
.aag-card-accent { width: 5px; flex-shrink: 0; }
.chair-accent     { background: linear-gradient(to bottom, #f5c938, #e8a44a); }
.organizer-accent { background: linear-gradient(to bottom, #2dd4a0, #059669); }
.presenter-accent { background: linear-gradient(to bottom, #ff7c50, #ef4444); }
.coauthor-accent  { background: linear-gradient(to bottom, #a78bfa, #7c3aed); }

.aag-card-inner {
  flex: 1;
  padding: 1.1rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}
.aag-card-top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .45rem;
}
.aag-type-tag {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  font-size: .68rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: .2rem .55rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.aag-hybrid-tag {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  font-size: .68rem;
  font-weight: 600;
  color: #0369a1;
  background: #e0f2fe;
  border: 1px solid #bae6fd;
  padding: .2rem .55rem;
  border-radius: 20px;
}
.aag-session-title {
  font-size: .97rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.45;
}
.aag-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: .82rem;
  color: var(--text-muted);
}
.aag-meta span {
  display: flex;
  align-items: center;
  gap: .35rem;
}
.aag-meta i { color: var(--accent); font-size: .75rem; }

/* Summary strip */
.aag-summary {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  background: linear-gradient(135deg, #0b1a2e, #0e2a44);
  border-radius: 16px;
  padding: 1.75rem 2rem;
  box-shadow: 0 4px 20px rgba(0,0,0,.18);
}
.aag-sum-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .2rem;
  min-width: 70px;
}
.aag-sum-num {
  font-family: 'Merriweather', serif;
  font-size: 2rem;
  font-weight: 700;
  color: #e8a44a;
  line-height: 1;
}
.aag-sum-label {
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: rgba(255,255,255,.6);
}

/* Responsive */
@media (max-width: 640px) {
  .aag-conf-title { font-size: 3rem; }
  .aag-day-block { grid-template-columns: 1fr; }
  .aag-day-label { flex-direction: row; gap: .6rem; position: static; justify-content: flex-start; padding: .6rem 1rem; }
}