:root {
  --serif: 'Crimson Pro', 'Garamond', Georgia, serif;
  --mono: 'IBM Plex Mono', 'Courier New', monospace;
  --sans: 'Inter', -apple-system, sans-serif;
  
  --bg: #fdfdf9;
  --text: #1a1a1a;
  --text-secondary: #555;
  --border: #d4d4d4;
  --accent: #2a5a7a;
  --accent-light: #e8f0f5;
  --link: #2a5a7a;
  --link-hover: #1a3a4a;
}

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

body {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 30px;
}

header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 30px;
  margin-bottom: 50px;
}

.header-content {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 25px;
}

.watch-icon {
  width: 60px;
  height: 60px;
  flex-shrink: 0;
  border-radius: 90%;
  object-fit: cover;
  border: 1px solid var(--border);
}

h1 {
  font-family: var(--sans);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 8px;
}

.subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  font-style: italic;
}

nav {
  margin-top: 25px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 25px;
  flex-wrap: wrap;
}

nav a {
  font-family: var(--sans);
  font-size: 14px;
  text-decoration: none;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.2s;
  font-weight: 500;
}

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

h2 {
  font-family: var(--sans);
  font-size: 22px;
  font-weight: 600;
  margin-top: 50px;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

h3 {
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 600;
  margin-top: 35px;
  margin-bottom: 15px;
}

p {
  margin-bottom: 18px;
}

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all 0.2s;
}

a:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

.paper {
  margin-bottom: 35px;
  padding-bottom: 25px;
  border-bottom: 1px solid #f0f0f0;
}

.paper:last-child {
  border-bottom: none;
}

.paper-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.paper-authors {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-style: italic;
}

.paper-venue {
  font-size: 15px;
  margin-bottom: 10px;
}

.paper-venue em {
  font-style: italic;
}

.paper-links {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.paper-links a {
  font-family: var(--mono);
  font-size: 13px;
  padding: 5px 12px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 3px;
  border-bottom: none;
  transition: all 0.2s;
}

.paper-links a:hover {
  background: var(--accent);
  color: white;
}

.paper-abstract {
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 12px;
  line-height: 1.6;
  padding-left: 15px;
  border-left: 2px solid #e8e8e8;
}

.course-item {
  margin-bottom: 25px;
}

.course-code {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  background: var(--accent-light);
  padding: 3px 8px;
  border-radius: 3px;
  margin-right: 8px;
}

.course-title {
  font-weight: 600;
  font-size: 17px;
}

.resource-card {
  background: #f9f9f9;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 25px;
  margin-bottom: 25px;
}

.resource-card h3 {
  margin-top: 0;
}

.resource-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 14px;
}

.resource-link::before {
  content: '→';
  color: var(--accent);
}

.blog-posts {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.blog-post {
  padding-bottom: 30px;
  border-bottom: 1px solid #f0f0f0;
}

.blog-post:last-child {
  border-bottom: none;
}

.blog-date {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.blog-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
}

.blog-excerpt {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

footer {
  margin-top: 80px;
  padding-top: 30px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
}

.contact-info {
  margin-top: 20px;
}

.contact-info p {
  margin-bottom: 8px;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: #f5f5f5;
  padding: 2px 6px;
  border-radius: 3px;
}

.section-category {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-top: 40px;
  margin-bottom: 15px;
  border-bottom: 1px solid #e8e8e8;
  padding-bottom: 8px;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 280px;
  background-image: url('../images/background1.png');
  background-repeat: no-repeat;
  background-position: top right;
  background-size: 280px auto;
  opacity: 0.5;
  pointer-events: none;
  z-index: -1;
}

.contact-layout {
  display: flex;
  align-items: flex-start;
  gap: 30px;
}

.contact-details {
  flex: 1;
}

.contact-photo {
  width: 180px;
  flex-shrink: 0;
  border-radius: 4px;
  object-fit: cover;
}

@media (max-width: 600px) {
  body {
    padding: 25px 20px;
  }

  h1 {
    font-size: 24px;
  }

  nav ul {
    gap: 15px;
  }

  .paper-links {
    flex-direction: column;
    gap: 8px;
  }

  .contact-layout {
    flex-direction: column;
  }

  .contact-photo {
    width: 100%;
  }
}