:root {
  --bg: #f8f9fb;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --card: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
	Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  background: var(--card);
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 10;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1.5rem;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1rem;
  font-weight: 500;
}

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

h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.6rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

h3 {
  margin-bottom: 0.25rem;
}

ul {
  padding-left: 1.2rem;
}

li {
  margin-bottom: 0.5rem;
}

footer {
  margin-top: 3rem;
  padding: 2rem 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}


.subtitle {
  color: var(--muted);
  font-size: 1.1rem;
}

.card {
  background: var(--card);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
  margin-bottom: 1.5rem;
}

.bio {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2rem;
  align-items: center;
  margin-top: 2rem;
}

.avatar {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  background: #d1d5db;
}

.teaching-row {
  display: grid;
  grid-template-columns: 120px 1fr; /* left column fixed width, right column fills remaining space */
  gap: 0.8rem;
  align-items: start;
  margin-bottom: 1rem;
  padding: 0rem;
}

.teaching-date {
  font-weight: bold;
  color: black;
}

.teaching-info {
  color: var(--text);
}

.orcid-icon {
  width: 18px;         /* smaller, inline with text */
  height: 18px;
  vertical-align: text-bottom;
}

.pub {
  margin-bottom: 1rem;
}


@media (max-width: 768px) {
  .bio {
	grid-template-columns: 1fr;
	text-align: center;
  }

  .avatar {
	margin: 0 auto;
  }

  nav {
	flex-direction: column;
	align-items: flex-start;
  }
}


.topic-meta {
  font-size: 1.1rem;
  color: var(--muted);
  font-weight: normal;
}


.video-meta {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: normal;
}

.video-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.video-links a {
  text-decoration: none;
  color: var(--text);
  width: 220px;
}

.video-links img {
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.12);
  transition: transform 0.2s;
}

.video-links img:hover {
  transform: scale(1.04);
}

.video-links span {
  display: block;
  text-align: center;
  margin-top: 0.4rem;
  font-size: 0.9rem;
  color: var(--muted);
}