:root {
  --bg-color: #ffffff;
  --text-color: #333333;
  --link-color: #333333;
  --accent-color: #666666;
  --font-main: "Jost", sans-serif;
  --container-width: 1000px;
  --spacing: 2rem;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  font-weight: 300;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.7;
}

/* Header */
.site-header {
  padding: var(--spacing);
  text-align: center;
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 2px;
}

.nav-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.nav-links li a {
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 1px;
}

/* Main Content */
.main-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--spacing);
  min-height: 60vh;
}

/* Hero Section */
.hero-section {
  position: relative;
  height: 60vh;
  min-height: 400px;
  background-image: url('/images/hero-bg.png');
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5); /* overlay opacity */
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 0 2rem;
  max-width: 800px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 500;
  margin-bottom: 1rem;
  letter-spacing: 2px;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 300;
  opacity: 0.9;
}

/* Homepage */
.intro-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2rem;
}

.intro-greeting {
  font-size: 2.5rem;
  font-weight: 500;
}

.intro-content {
  max-width: 100%;
}

.home-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.home-link-item {
  border: 1px solid var(--text-color);
  padding: 0.5rem 1.5rem;
  letter-spacing: 1px;
}

.home-link-item:hover {
  background-color: var(--text-color);
  color: var(--bg-color);
}

/* Page Headers */
.page-title {
  font-size: 2rem;
  font-weight: 400;
  text-align: center;
  margin-bottom: 3rem;
  letter-spacing: 3px;
}

/* Lists */
.list-item {
  margin-bottom: 2rem;
}

.item-date {
  font-size: 0.85rem;
  color: var(--accent-color);
}

/* Research List */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.research-item {
  border: 1px solid #eee;
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s;
}

.research-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.research-thumb {
  height: 200px;
  overflow: hidden;
  background-color: #f5f5f5;
}

.research-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.research-info {
  padding: 1.5rem;
}

.research-info h2 {
  font-size: 1.25rem;
  margin: 0 0 0.5rem 0;
  font-weight: 500;
}

.research-summary {
  font-size: 0.95rem;
  color: var(--text-color);
  line-height: 1.5;
}

/* Publication List */
.publication-item {
  margin-bottom: 2rem;
}

.pub-title {
  font-weight: 500;
  font-size: 1.1rem;
}

.pub-authors {
  font-size: 0.95rem;
  color: var(--text-color);
}

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

.pub-links {
  margin-top: 0.5rem;
  font-size: 0.85rem;
}

.pub-links a {
  margin-right: 1rem;
  text-decoration: underline;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: var(--spacing);
  font-size: 0.8rem;
  color: var(--accent-color);
  margin-top: 2rem;
}

/* Homepage Bio Card */
.home-headline {
  font-size: 2.2rem;
  font-weight: 500;
  text-align: center;
  margin-bottom: 3rem;
  line-height: 1.3;
}

.bio-card {
  background: white;
  border-radius: 16px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
  padding: 3rem;
  margin: 2rem auto;
  max-width: 100%; /* Full width of container */
  text-align: left;
}

.bio-content {
  font-size: 1.2rem; /* Increased size */
  line-height: 1.8;
  color: var(--text-color);
  white-space: pre-line; /* Handle line breaks better than pre-wrap for this context */
  font-family: var(--font-main);
}

.bio-card p {
  margin-bottom: 1.5rem;
}

.bio-social-links {
  margin-top: 2rem;
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  font-weight: 500;
  font-size: 0.9rem;
}

.bio-social-links a {
  letter-spacing: 1px;
}

.home-education {
  max-width: 800px;
  margin: 3rem auto;
  text-align: left;
}

.home-education h2 {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 1px;
  margin-bottom: 2rem;
  text-align: center;
}

/* Blog Layouts */
.blog-header {
  text-align: center;
  margin-bottom: 4rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.blog-card {
  background: white;
  border: 1px solid #f0f0f0;
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s ease;
  height: 100%;
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
  border-color: #e0e0e0;
}

.blog-card-link {
  display: block;
  height: 100%;
  color: inherit;
}

.blog-card-content {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.blog-meta {
  font-size: 0.85rem;
  color: var(--accent-color);
  margin-bottom: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.blog-title {
  font-size: 1.4rem;
  margin: 0 0 1rem 0;
  line-height: 1.3;
  font-weight: 500;
}

.blog-summary {
  font-size: 0.95rem;
  color: var(--text-color);
  line-height: 1.6;
  opacity: 0.8;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.blog-read-more {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--link-color);
  margin-top: auto;
}

/* Blog Single Post */
.blog-post {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem;
}

.blog-post-header {
  text-align: center;
  margin-bottom: 4rem;
}

.blog-post-title {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.blog-post-meta {
  color: var(--accent-color);
  font-size: 1.1rem;
}

.blog-post-content {
  font-size: 1.25rem; /* Larger font for readability */
  line-height: 1.8;
  font-weight: 300;
}

.blog-post-content p {
  margin-bottom: 2rem;
}

.blog-post-content h2 {
  font-size: 1.8rem;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.blog-post-content h3 {
  font-size: 1.4rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 500;
}

.blog-post-content pre {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 2rem 0;
  font-size: 0.9em;
  border: 1px solid #eee;
}

.blog-post-footer {
  margin-top: 5rem;
  padding-top: 2rem;
  border-top: 1px solid #eee;
}

.back-link {
  display: inline-block;
  font-weight: 500;
  font-size: 1.1rem;
  transition: transform 0.2s;
}

.back-link:hover {
  transform: translateX(-5px);
  opacity: 1;
}

/* Education Styles */

/* About / CV */
.bio-section {
  margin-bottom: 3rem;
  font-size: 1.1rem;
  line-height: 1.8;
}

.cv-section h2 {
  font-size: 1.5rem;
  font-weight: 500;
  margin-top: 2rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid #eee;
  padding-bottom: 0.5rem;
  letter-spacing: 1px;
}

.cv-item {
  display: flex;
  margin-bottom: 1.5rem;
}

.cv-year {
  width: 100px;
  font-weight: 500;
  color: var(--accent-color);
  flex-shrink: 0;
}

.cv-details strong {
  font-weight: 500;
}

.interests-list {
  columns: 2;
  list-style: none;
  padding: 0;
}

.interests-list li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  border-left: 2px solid #eee;
}

.skills-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.skill-category h3 {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.cv-download {
  text-align: center;
  margin-top: 4rem;
}

.btn-download {
  display: inline-block;
  background-color: var(--text-color);
  color: var(--bg-color);
  padding: 1rem 2rem;
  font-weight: 500;
  letter-spacing: 1px;
  border-radius: 4px;
  transition: all 0.2s;
}

.btn-download:hover {
  background-color: var(--accent-color);
  opacity: 1;
  transform: translateY(-2px);
}