/* ============================================================
   Academic Homepage — jinghanyang.com-inspired design
   Zhixiong Xiao
   ============================================================ */

/* ── Design Tokens ──────────────────────────────────────── */

:root {
  /* Colors */
  --bg:         #f4f6f8;
  --surface:    #ffffff;
  --ink:        #16162a;
  --ink-soft:   #374151;
  --ink-faint:  #5c6477;
  --line:       #e2e8f0;
  --line-soft:  #eef2f6;
  --accent:     #3b6fa0;
  --accent-2:   #608bb8;
  --accent-wash:#eaf1f8;
  --link:       #2f6fa8;
  --link-dark:  #1d4e7c;
  --rose:       #9b5ea7;
  --rose-soft:  #c9a0d4;
  --hot:        linear-gradient(135deg, #6f9fd6 0%, #e090d4 100%);

  /* Layout */
  --page-width:  1080px;
  --page-gap:    28px;
  --block-gap:   20px;

  /* Typography */
  --body-size:     17.5px;
  --heading-size:  .94rem;
  --lead-size:     1.22rem;

  /* Cards */
  --card-pad:  32px 36px;
  --shadow:    0 1px 2px rgba(26,26,46,.04), 0 6px 20px rgba(26,26,46,.05);
  --shadow-lg: 0 2px 6px rgba(26,26,46,.05), 0 14px 38px rgba(26,26,46,.08);
  --radius:    18px;
  --radius-sm: 12px;
  --radius-xs: 8px;
}

/* ── Reset & Base ──────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  font-size: var(--body-size);
}

a {
  color: var(--link);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1.5px solid rgba(47,111,168,.20);
  transition: color .16s ease, border-color .16s ease, background .16s ease;
  border-radius: 2px;
}
a:hover {
  color: var(--link-dark);
  border-bottom-color: var(--link-dark);
  background: var(--accent-wash);
}

/* ── Top Navigation ────────────────────────────────────── */

.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 0 32px;
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 48px;
}

.nav-item {
  font-size: .92rem;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 6px 14px;
  border-radius: 8px;
  border-bottom: none;
  transition: color .16s ease, background .16s ease;
}
.nav-item:hover {
  color: var(--ink);
  background: var(--accent-wash);
}
.nav-item.active {
  color: var(--link);
  font-weight: 600;
}

.nav-dot {
  color: var(--ink-faint);
  font-weight: 300;
  user-select: none;
}

/* ── Layout ────────────────────────────────────────────── */

.wrap {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 24px 32px 20px;
}

.main { min-width: 0; }

/* ── Module Card ───────────────────────────────────────── */

.module {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--card-pad);
  margin-bottom: var(--block-gap);
  animation: rise .45s cubic-bezier(.2,.7,.3,1) both;
}
.module:nth-child(2) { animation-delay: .05s; }
.module:nth-child(3) { animation-delay: .10s; }
.module:nth-child(4) { animation-delay: .15s; }
.module:nth-child(5) { animation-delay: .20s; }
.module:nth-child(6) { animation-delay: .25s; }

@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.module h2 {
  font-size: var(--heading-size);
  font-weight: 700;
  letter-spacing: .10em;
  text-transform: uppercase;
  color: var(--rose);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.module h2 i {
  font-size: 1em;
  width: 18px;
  text-align: center;
}
.module h2::after {
  content: "";
  flex: 1;
  height: 2px;
  background: var(--line);
  margin-left: 2px;
}

.module p {
  color: var(--ink-soft);
  margin-bottom: 10px;
  line-height: 1.7;
}
.module p:last-child { margin-bottom: 0; }

/* ── Identity / Profile Header ─────────────────────────── */

.id-card { padding: var(--card-pad); }

.id-bio { margin-top: 14px; }

.id-cv-line {
  margin-top: 16px;
  font-size: .88rem;
  color: var(--ink-soft);
}
.id-cv-line a {
  color: var(--ink-soft);
  border-bottom: 1.5px solid rgba(47,111,168,.20);
  font-weight: 500;
}
.id-cv-line a:hover {
  color: var(--link);
  border-bottom-color: var(--link);
  background: none;
}
.id-cv-line .s-icon {
  color: var(--ink-faint);
  margin-right: 2px;
}

.id-divider {
  border: none;
  border-top: 1px solid var(--line);
  margin: 20px 0 0;
}

.id-contact {
  padding-top: 16px;
}

.id-row {
  display: flex;
  gap: 28px;
  align-items: center;
}

.id-photo-wrap {
  flex-shrink: 0;
  order: 2;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--accent-wash);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: auto;
}

.id-text {
  flex: 1;
  min-width: 0;
  order: 1;
}

.id-photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.id-fb {
  display: none;
  font-size: 56px;
  font-weight: 600;
  color: var(--accent);
  font-family: 'Newsreader', 'Georgia', serif;
}

.id-text { min-width: 0; }

.id-name {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.2;
  color: var(--ink);
}

.id-cn {
  font-size: 1.1rem;
  color: var(--ink-soft);
  font-weight: 400;
}

.id-pronouns {
  font-size: .82rem;
  color: var(--ink-faint);
  margin-top: 2px;
}

.id-affil {
  font-size: .98rem;
  color: var(--ink-soft);
  margin-top: 6px;
  line-height: 1.4;
}

.id-email {
  margin-top: 14px;
  font-size: .90rem;
  color: var(--ink-soft);
}
.id-email a {
  color: var(--ink-soft);
  border-bottom: 1.5px solid rgba(47,111,168,.20);
  font-weight: 450;
}
.id-email a:hover {
  color: var(--link);
  border-bottom-color: var(--link);
  background: none;
}

.id-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.id-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: .84rem;
  color: var(--ink-soft);
  background: var(--bg);
  border: 1px solid var(--line);
  text-decoration: none;
  font-weight: 450;
  transition: all .18s ease;
}
.id-link:hover {
  color: var(--ink);
  background: var(--accent-wash);
  border-color: var(--accent-2);
  border-bottom-color: var(--accent-2);
  transform: translateY(-1px);
}
.id-link .s-icon { font-size: .95rem; flex-shrink: 0; }

/* ── Lead paragraph ────────────────────────────────────── */

.lead {
  font-size: var(--lead-size);
  font-weight: 500;
  line-height: 1.62;
  letter-spacing: -.01em;
  color: var(--ink);
  margin-bottom: 14px;
}

/* ── Interest Chips ────────────────────────────────────── */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 14px;
}

.chip {
  font-size: .88rem;
  color: var(--ink-soft);
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 6px 15px;
  border-radius: 999px;
  cursor: default;
  transition: all .18s ease;
  font-weight: 450;
}
.chip:hover {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ── Publications ──────────────────────────────────────── */

.pub {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin-bottom: 10px;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.pub:last-child { margin-bottom: 0; }
.pub:hover {
  border-color: var(--accent-2);
  transform: translateX(3px);
  box-shadow: var(--shadow);
}

.pub-figure {
  flex-shrink: 0;
  width: 110px;
  height: 78px;
  border-radius: var(--radius-xs);
  overflow: hidden;
  background: var(--accent-wash);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .7rem;
  color: var(--ink-faint);
}
.pub-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.pub-figure .fig-placeholder {
  font-size: 1.6rem;
  opacity: .45;
}

.pub-body { min-width: 0; flex: 1; }

.pub-title {
  font-weight: 600;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.38;
}

.pub-authors {
  font-size: 1rem;
  color: var(--ink-soft);
  margin-top: 3px;
  line-height: 1.45;
}
.pub-authors .me { color: var(--ink); font-weight: 650; }

.pub-meta {
  font-size: .78rem;
  margin-top: 6px;
}

.pub-star { color: var(--rose); font-weight: 700; }
.pub-hash { color: var(--accent); font-weight: 700; }

.pub-legend {
  font-size: .82rem;
  color: var(--ink-faint);
  margin-top: -4px;
  margin-bottom: 18px;
}

.pub-venue {
  font-weight: 500;
  color: var(--ink-soft);
  font-size: 1rem;
}

.pub-links {
  margin-top: 4px;
}

.pub-link {
  font-size: .78rem;
  font-weight: 500;
  border-bottom: none;
  color: var(--link);
  padding: 0 2px;
}
.pub-link:hover { background: none; color: var(--link-dark); }

/* ── Subsections (Experience / Education) ──────────────── */

.sub-sec {
  margin-top: 24px;
}
.sub-sec:first-child { margin-top: 0; }

.sub-sec h3 {
  font-size: .98rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-soft);
}

/* Experience list */
.exp-item {
  position: relative;
  padding: 10px 0 10px 22px;
  border-left: 2px solid var(--line);
  margin-left: 6px;
  transition: border-color .2s ease;
}
.exp-item:last-child { padding-bottom: 0; border-left-color: transparent; }
.exp-item:hover { border-left-color: var(--accent-2); }
.exp-item::before {
  content: "";
  position: absolute;
  left: -6px; top: 14px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--accent-2);
  transition: background .18s ease, transform .18s ease;
}
.exp-item:hover::before {
  background: var(--accent);
  transform: scale(1.25);
}

.exp-role { font-weight: 600; color: var(--ink); font-size: .94rem; }
.exp-inst { font-size: .88rem; color: var(--ink-soft); margin-top: 1px; }
.exp-period { font-size: .80rem; color: var(--ink-faint); font-weight: 500; }

/* Timeline (Education) */
.tl-item {
  position: relative;
  padding: 10px 0 10px 28px;
  border-left: 2px solid var(--line);
  margin-left: 6px;
  transition: border-color .2s ease;
}
.tl-item:last-child { padding-bottom: 0; border-left-color: transparent; }
.tl-item:hover { border-left-color: var(--accent-2); }
.tl-item::before {
  content: "";
  position: absolute;
  left: -6px; top: 14px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--accent-2);
  transition: background .18s ease, transform .18s ease;
}
.tl-item:hover::before {
  background: var(--accent);
  transform: scale(1.25);
}

.tl-degree { font-weight: 600; color: var(--ink); font-size: .94rem; }
.tl-school { font-size: .88rem; color: var(--ink-soft); margin-top: 1px; }
.tl-period { font-size: .80rem; color: var(--ink-faint); font-weight: 500; }

/* Awards */
.award-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: .92rem;
}
.award-item:last-child { border-bottom: none; }
.award-name { color: var(--ink); font-weight: 500; }
.award-date { color: var(--ink-faint); font-size: .82rem; white-space: nowrap; }

/* Teaching */
.teach-item {
  padding: 8px 0;
  border-bottom: 1px solid var(--line-soft);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}
.teach-item:last-child { border-bottom: none; }
.teach-role { font-size: .92rem; color: var(--ink); font-weight: 500; }
.teach-period { font-size: .82rem; color: var(--ink-faint); white-space: nowrap; }

/* ── Research topics ───────────────────────────────────── */

.research-topic {
  margin-bottom: 16px;
}
.research-topic:last-child { margin-bottom: 0; }
.research-topic .chips { margin-top: 8px; }

/* ── Gallery ───────────────────────────────────────────── */

.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 14px;
}

.gallery-item {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-xs);
  overflow: hidden;
  background: var(--accent-wash);
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}
.gallery-item:hover img {
  transform: scale(1.06);
}

/* ── News (year-grouped list) ──────────────────────────── */

.news-year-list {
  display: flex;
  flex-direction: column;
}

.news-year-row {
  display: flex;
  gap: 24px;
  padding: 5px 0;
  border-bottom: 1px solid var(--line-soft);
  align-items: baseline;
}
.news-year-row:first-child { padding-top: 0; }
.news-year-row:last-child { border-bottom: none; padding-bottom: 0; }

.news-year-label {
  flex-shrink: 0;
  width: 52px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink-faint);
  line-height: 1.5;
}

.news-year-items {
  flex: 1;
  min-width: 0;
}

.news-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 2px 0;
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.5;
}
.news-line-date {
  flex-shrink: 0;
  font-size: 1rem;
  color: var(--ink-faint);
}

/* Empty state */
.empty-hint {
  color: var(--ink-faint);
  font-size: .88rem;
  font-style: italic;
  padding: 8px 0;
}

/* ── Footer ────────────────────────────────────────────── */

footer {
  text-align: center;
  padding: 16px 0 40px;
  color: var(--ink-faint);
  font-size: .78rem;
}

/* ── Responsive ────────────────────────────────────────── */

@media (max-width: 960px) {
  .wrap {
    padding: 24px 20px 48px;
  }

  .id-row {
    flex-direction: column;
    text-align: center;
  }
  .id-photo-wrap {
    order: -1;
    width: 130px;
    height: 130px;
    margin: 0 auto;
  }
  .module { padding: 26px 22px; }

  .pub {
    flex-direction: column;
  }
  .pub-figure {
    width: 100%;
    height: 140px;
  }

  .gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  .top-nav { padding: 0 12px; }
  .nav-item { font-size: .82rem; padding: 5px 10px; }

  .wrap { padding: 20px 12px 40px; }
  .module { padding: 22px 16px; }
  .id-card { padding: 24px 18px; }

  .id-photo-wrap { width: 120px; height: 120px; margin: 0 auto; }
  .id-name { font-size: 1.4rem; }

  .pub-figure { height: 110px; }

  .gallery {
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
  }

  .award-item, .teach-item {
    flex-direction: column;
    gap: 2px;
  }
}

/* ── Publications page ─────────────────────────────────── */

.pub-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--page-gap);
  align-items: start;
}

.pub-year-block { margin-bottom: 24px; }
.pub-year-block:last-child { margin-bottom: 0; }

.pub-year-heading {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--line);
}

.pub-year-nav { position: sticky; top: 64px; }

.year-nav-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 10px;
}

.year-nav-inner {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.year-nav-link {
  font-size: .88rem;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 6px 10px;
  border-radius: var(--radius-xs);
  text-decoration: none;
  border-bottom: none;
  transition: all .16s ease;
}
.year-nav-link:hover,
.year-nav-link.active {
  color: var(--link);
  background: var(--accent-wash);
}

/* Full list link on homepage */
.pub-all-link {
  margin-top: 14px;
  text-align: right;
}
.pub-all-link a {
  font-weight: 500;
  font-size: .88rem;
}

/* ── CV page ───────────────────────────────────────────── */

.cv-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 5px 0;
  border-bottom: 1px solid var(--line-soft);
}
.cv-item:first-child { padding-top: 0; }
.cv-item:last-child { border-bottom: none; padding-bottom: 0; }
.cv-item-main {
  flex: 1;
  min-width: 0;
}
.cv-item-period {
  font-size: 1.02rem;
  color: var(--ink-faint);
  white-space: nowrap;
  flex-shrink: 0;
}

.cv-item-title {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
}

.cv-item-sub {
  font-size: .94rem;
  color: var(--ink-soft);
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.cv-item-detail {
  font-size: .90rem;
  color: var(--ink-faint);
  margin-top: 3px;
}

.cv-item-award .cv-item-title {
  font-weight: 400;
}

.cv-list .cv-item {
  position: relative;
  padding-left: 18px;
}
.cv-list .cv-item::before {
  content: "•";
  position: absolute;
  left: 0;
  top: 5px;
  color: var(--ink-faint);
}

.cv-logo {
  width: 16px;
  height: 16px;
  object-fit: contain;
  flex-shrink: 0;
}

@media (max-width: 960px) {
  .pub-layout {
    grid-template-columns: 1fr;
  }
  .pub-year-nav {
    position: static;
    order: -1;
  }
  .year-nav-inner {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px;
  }
}

/* ── Print ─────────────────────────────────────────────── */

@media print {
  body { background: #fff; }
  .top-nav { display: none; }
  .module { box-shadow: none; border: 1px solid #ddd; animation: none; }
}