:root {
  --bg: #1a1a1a;
  --surface: #202020;
  --text: #e0e0e0;
  --muted: #aaaaaa;
  --body: #cccccc;
  --heading: #ffffff;
  --link: #7ab8d4;
  --border: #2e2e2e;
  --card: #222222;
}

:root[data-theme="light"] {
  --bg: #f7f7f7;
  --surface: #ffffff;
  --text: #111111;
  --muted: #666666;
  --body: #2a2a2a;
  --heading: #000000;
  --link: #176d9b;
  --border: #dddddd;
  --card: #ffffff;
}

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

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  transition: background-color .2s ease, color .2s ease;
}

a { color: var(--link); }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding: 18px 48px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  gap: 22px;
}

.site-nav a {
  color: var(--link);
  text-decoration: none;
  font-size: 16px;
  padding: 3px 0;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a.active {
  border-bottom-color: var(--link);
}

.theme-toggle {
  border: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 4px;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 56px 32px 80px;
}

.hero-name {
  color: var(--heading);
  font-size: clamp(2.25rem, 7vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 8px;
}

.hero-subtitle {
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 4px;
}

.hero-subtitle:last-of-type { margin-bottom: 32px; }

.hero-body {
  display: flex;
  gap: 48px;
  align-items: flex-start;
}

.hero-bio {
  flex: 1;
  color: var(--body);
  font-size: 1rem;
  line-height: 1.75;
}

.hero-bio p + p { margin-top: 18px; }

.hero-bio a,
.news-text a,
.paper-links a {
  color: var(--link);
  text-decoration: none;
}

.hero-bio a:hover,
.news-text a:hover,
.paper-links a:hover { text-decoration: underline; }

.hero-photo-wrap {
  flex: 0 0 240px;
}

.hero-photo {
  width: 240px;
  height: 290px;
  border-radius: 12px;
  display: block;
  object-fit: cover;
  object-position: center;
  background: var(--surface);
  border: 1px solid var(--border);
}

.section {
  margin-top: 72px;
}

.section-title,
.page-title {
  color: var(--heading);
  font-weight: 300;
}

.section-title {
  font-size: 1.9rem;
  margin-bottom: 28px;
}

.page-title {
  font-size: 2.3rem;
  margin-bottom: 10px;
}

.page-intro {
  color: var(--muted);
  margin-bottom: 34px;
  max-width: 690px;
}

.news-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--border);
}

.news-item:last-child { border-bottom: 1px solid var(--border); }
.news-date { color: var(--text); font-size: .9rem; font-weight: 700; line-height: 1.4; }
.news-text { color: var(--body); font-size: .97rem; line-height: 1.7; }

.gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.gallery-card {
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.gallery-card img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--surface);
}

.gallery-card figcaption {
  color: var(--muted);
  font-size: .9rem;
  padding: 12px 14px 14px;
}

.paper-list { display: grid; gap: 18px; }

.paper-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px 24px;
}

.paper-year {
  color: var(--muted);
  font-size: .85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 6px;
}

.paper-title {
  color: var(--heading);
  font-size: 1.12rem;
  line-height: 1.45;
  margin-bottom: 7px;
}

.paper-authors,
.paper-venue {
  color: var(--body);
  font-size: .94rem;
}

.paper-venue { color: var(--muted); margin-top: 2px; }
.paper-links { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 12px; font-size: .93rem; }

.footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 32px 36px;
  color: var(--muted);
  font-size: .82rem;
}

@media (max-width: 650px) {
  .site-nav {
    justify-content: center;
    padding: 14px 16px;
    gap: 17px;
  }

  main { padding: 38px 20px 60px; }
  .hero-body { flex-direction: column-reverse; gap: 28px; }
  .hero-photo-wrap { flex-basis: auto; width: 100%; }
  .hero-photo { width: min(100%, 320px); height: 360px; margin: 0 auto; }
  .news-item { grid-template-columns: 84px 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .footer { padding: 0 20px 28px; }
}