:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #2563eb;
  --border: #eaeaea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f10;
    --fg: #e8e8e8;
    --muted: #999;
    --accent: #60a5fa;
    --border: #2a2a2a;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family:
    ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  font-size: 17px;
}

.topbar {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.topbar-name {
  color: var(--fg);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
}

.topbar-name:hover {
  color: var(--accent);
  text-decoration: none;
}

.topbar-nav {
  display: flex;
  gap: 1.5rem;
}

.topbar-nav a {
  color: var(--fg);
  text-decoration: none;
  font-size: 0.95rem;
}

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

main {
  max-width: 920px;
  margin: 0 auto;
  padding: 3rem 1.25rem 2rem;
}

.profile {
  display: flex;
  gap: 2rem;
  align-items: center;
  margin-bottom: 1rem;
}

.profile-photo {
  width: 180px;
  height: 240px;
  border-radius: 8px;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--border);
}

.profile-info {
  flex: 1;
  min-width: 0;
}

@media (max-width: 600px) {
  .profile {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .profile-photo {
    width: 140px;
    height: 140px;
  }
}

header h1 {
  font-size: 2rem;
  margin: 0 0 0.25rem;
  letter-spacing: -0.01em;
}

.social-links {
  display: flex;
  gap: 1rem;
  margin: 0.5rem 0 0.75rem;
  font-size: 1.25rem;
}

.cv-line {
  margin: 0 0 2rem;
}

.cv-link {
  color: var(--accent);
  font-weight: 600;
}

.cv-link:hover {
  text-decoration: underline;
}

.social-links a {
  color: var(--fg);
  display: inline-flex;
  align-items: center;
  transition: color 0.15s ease;
}

.social-links a:hover {
  color: var(--accent);
  text-decoration: none;
}

section {
  margin-top: 2.5rem;
  scroll-margin-top: 4rem;
}

section h2 {
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 0.75rem;
  font-weight: 600;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  padding-left: 1.1rem;
  margin: 0;
}

li {
  margin: 0.25rem 0;
}

.publications {
  list-style: none;
  padding-left: 0;
}

.pub {
  margin-bottom: 1.25rem;
}

.pub-title {
  font-weight: 600;
}

.pub-authors {
  font-size: 0.95rem;
}

.pub-venue {
  color: var(--muted);
  font-size: 0.9rem;
  font-style: italic;
}

.pub-links {
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.experience {
  list-style: none;
  padding-left: 0;
}

.exp {
  margin-bottom: 1.25rem;
}

.exp-head {
  font-weight: 600;
}

.exp-meta {
  color: var(--muted);
  font-size: 0.9rem;
  font-style: italic;
}

.exp-desc {
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

footer {
  max-width: 920px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}