/* Google Sites-look academic homepage — minimal CSS, no framework */

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

:root {
  --primary: #1a73e8;          /* Google Sites blue */
  --primary-hover: #1557b0;
  --text: #202124;
  --muted: #5f6368;
  --hairline: #e8eaed;
  --bg: #ffffff;
  --content-max: 1100px;
}

html { font-size: 16px; }

body {
  font-family: 'Google Sans', 'Roboto', -apple-system, BlinkMacSystemFont,
               'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Top nav ---------- */

.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 3rem;
  font-size: 0.95rem;
}

.topnav .name {
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.topnav .nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.topnav .nav-links a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.25rem 0;
  transition: color 0.15s;
}

.topnav .nav-links a:hover { color: var(--text); }
.topnav .nav-links a.active { color: var(--text); font-weight: 500; }

.topnav .search {
  color: var(--muted);
  cursor: pointer;
  margin-left: 1rem;
  text-decoration: none;
}

/* ---------- Hero ---------- */

.hero {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 4rem 3rem 2rem;
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 400;
  color: var(--primary);
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-bottom: 1.5rem;
}

.hero h2,
.hero .subtitle {
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  font-weight: 400;
  color: var(--primary);
  margin-bottom: 0;
}

/* ---------- Main content area ---------- */

main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1rem 3rem 5rem;
}

main p { margin-bottom: 1rem; }
main a { color: var(--primary); text-decoration: none; }
main a:hover { text-decoration: underline; }

h3.section-title {
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--primary);
  margin: 2.5rem 0 1rem;
}

/* ---------- Course / publication cards ---------- */

.course, .pub {
  border-bottom: 1px solid var(--hairline);
  padding: 1.4rem 0;
}

.course:last-child, .pub:last-child { border-bottom: none; }

.course h4, .pub h4 {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.course-meta, .pub-meta {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.6rem;
}

.course-links a, .pub-links a {
  font-size: 0.9rem;
  color: var(--primary);
  text-decoration: none;
  margin-right: 1rem;
  display: inline-block;
  padding: 0.2rem 0;
}

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

/* ---------- CTA button (e.g. "Download CV") ---------- */

.cta {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 0.55rem 1.3rem;
  border-radius: 4px;
  font-size: 0.95rem;
  text-decoration: none;
  margin: 0.3rem 0 0.8rem;
  transition: background 0.15s;
}
.cta:hover { background: var(--primary-hover); text-decoration: none; }
.cta .meta { opacity: 0.85; font-size: 0.85rem; margin-left: 0.4rem; }

.social-row a {
  font-size: 0.92rem;
  color: var(--muted);
  text-decoration: none;
  margin-right: 1rem;
}
.social-row a:hover { color: var(--primary); }

/* ---------- Paper list (Research page, bullet-style) ---------- */

.paper-list {
  list-style: square;
  padding-left: 1.5rem;
  margin: 0.5rem 0 2.5rem;
}

.paper-list li {
  padding: 0.45rem 0;
  font-size: 1rem;
  color: var(--text);
  line-height: 1.55;
}

.paper-list li::marker {
  color: var(--text);
  font-size: 0.75em;
}

.paper-list li strong { font-weight: 600; }
.paper-list li em { font-style: italic; }
.paper-list li a { color: var(--primary); text-decoration: underline; }
.paper-list li a:hover { color: var(--primary-hover); }

.paper-list li ul.data-details {
  list-style: circle;
  padding-left: 1.4rem;
  margin: 0.4rem 0 0.3rem;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.5;
}

.paper-list li ul.data-details li {
  padding: 0.15rem 0;
}

.paper-list li ul.data-details li::marker {
  color: var(--muted);
  font-size: 0.7em;
}

.placeholder-note {
  color: var(--muted);
  font-style: italic;
}

/* ---------- Bio block (home page) ---------- */

.bio {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 3rem;
  margin: 4rem 0 2rem;
  align-items: start;
}

.bio img {
  width: 100%;
  max-width: 300px;
  height: auto;
  border-radius: 4px;
  object-fit: cover;
}

.bio h2 {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text);
  margin: 0 0 1rem;
}

.bio p {
  margin-bottom: 0.9rem;
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.7;
}

.bio a {
  color: var(--primary);
  text-decoration: underline;
}

/* ---------- Footer ---------- */

footer {
  border-top: 1px solid var(--hairline);
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

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

@media (max-width: 768px) {
  .topnav { padding: 1rem 1.5rem; flex-wrap: wrap; gap: 0.5rem; }
  .topnav .nav-links { gap: 1.2rem; font-size: 0.9rem; }
  .hero { padding: 2rem 1.5rem; }
  main { padding: 1rem 1.5rem 3rem; }
  .bio { grid-template-columns: 1fr; gap: 1.5rem; margin: 2rem 0; }
  .bio img { max-width: 220px; margin: 0 auto; }
}