/* Academic-style personal homepage — bilingual, minimal */

:root {
  --text: #1a1a1a;
  --text-muted: #4a4a4a;
  --accent: #2c5282;
  --bg: #fafaf8;
  --border: #e0ddd8;
  --font-serif-en: "Crimson Pro", Georgia, "Times New Roman", serif;
  --font-serif-zh: "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif-en);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

/* Chinese content uses serif SC */
[lang="zh"] .name,
[lang="zh"] .section-body,
[lang="zh"] .pub-list,
[lang="zh"] .edu-list,
[lang="zh"] .contact,
[lang="zh"] .top-nav,
[lang="zh"] .subsection-title,
[lang="zh"] .honors-list {
  font-family: var(--font-serif-zh);
}

/* Header: top nav (section links) + corner language */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.75rem;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.nav-link:hover {
  color: var(--accent);
}

.lang-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.lang-btn {
  font-family: inherit;
  font-size: inherit;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2em 0.4em;
  border-radius: 2px;
}

.lang-btn:hover {
  color: var(--text);
}

.lang-btn.active {
  color: var(--accent);
  font-weight: 600;
}

.lang-sep {
  color: var(--border);
  user-select: none;
}

/* Intro block */
.intro {
  margin-bottom: 2.5rem;
}

.intro-header {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  flex-wrap: wrap;
}

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

.intro .photo {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
}

@media (max-width: 600px) {
  .intro-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .intro .photo {
    width: 120px;
    height: 120px;
  }
}

.name {
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0 0 0.25em;
  letter-spacing: 0.02em;
}

.affiliation {
  color: var(--text-muted);
  font-size: 1rem;
  margin: 0 0 0.35em;
}

.tagline {
  font-style: italic;
  color: var(--text-muted);
  margin: 0;
  font-size: 0.95rem;
}

/* Sections */
.section {
  margin-bottom: 2rem;
  scroll-margin-top: 0.5rem;
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 0.75em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.35em;
}

.subsection-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin: 1.25em 0 0.5em;
}

.subsection-title:first-of-type {
  margin-top: 0.5em;
}

.honors-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1em;
}

.honors-list li {
  margin-bottom: 0.4em;
  padding-left: 0;
  font-size: 0.95rem;
}

.section-body {
  margin: 0;
  color: var(--text);
  font-size: 0.95rem;
}

/* Lists */
.pub-list,
.edu-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

ol.pub-list {
  padding-left: 1.5em;
}

ol.pub-list li:not(.pub-item) {
  list-style: decimal;
}

ol.pub-list .pub-item {
  list-style: none;
  padding-left: 2em;
  margin-left: -1.5em;
}

.pub-list li,
.edu-list li {
  margin-bottom: 0.65em;
  padding-left: 0;
  font-size: 0.95rem;
}

.pub-title {
  font-style: italic;
}

.pub-venue {
  color: var(--text-muted);
}

/* Publication row with optional image & links (lqts-style) */
.pub-item {
  list-style: none;
  counter-increment: pub;
  margin-bottom: 1rem;
}

.pub-item::before {
  content: counter(pub) ".";
  position: absolute;
  left: 0;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  font-size: 0.9em;
}

.pub-row {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding-left: 0;
  min-height: 100px;
}

.pub-media {
  width: 160px;
  min-width: 160px;
  height: 100px;
  border-radius: 6px;
  overflow: hidden;
  background: var(--border);
  flex-shrink: 0;
}

.pub-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.pub-media.pub-placeholder {
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.pub-media.pub-placeholder::after {
  content: "";
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

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

.pub-cite {
  font-size: 0.95rem;
  margin-bottom: 0.35em;
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-top: 0.35em;
}

.pub-links a {
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
}

.pub-links a:hover {
  text-decoration: underline;
}

/* When no image, pub-row can have no pub-media or placeholder */
.pub-row:only-child .pub-body {
  padding-left: 0;
}

ol.pub-list {
  counter-reset: pub;
}

ol.pub-list .pub-item {
  position: relative;
}

@media (max-width: 600px) {
  .pub-row {
    flex-direction: column;
    min-height: 0;
  }

  .pub-media {
    width: 100%;
    min-width: unset;
    height: 120px;
  }
}

/* Contact */
.contact a {
  color: var(--accent);
  text-decoration: none;
}

.contact a:hover {
  text-decoration: underline;
}

/* Footer */
.site-footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.site-footer p {
  margin: 0;
}

@media (max-width: 480px) {
  body {
    padding: 1.5rem 1rem 2rem;
  }

  .name {
    font-size: 1.5rem;
  }
}