/* ==================== Reset & Variables ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #1a1a1a;
  --secondary-color: #666666;
  --light-bg: #ffffff;
  --light-gray: #f5f5f5;
  --border-color: #e0e0e0;
  --accent-color: #2563eb;
  --accent-light: #dbeafe;
  --accent-dark: #1e40af;
  --teal-color: #0d9488;
  --purple-color: #7c3aed;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --transition: all 0.3s ease;
}

html {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  color: var(--primary-color);
  background-color: var(--light-bg);
  line-height: 1.6;
  font-size: 16px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ==================== Typography ==================== */
h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-xl);
  color: var(--primary-color);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--secondary-color);
  font-size: 1rem;
}

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

a:hover {
  color: var(--primary-color);
}

/* ==================== Navigation ==================== */
nav {
  background-color: var(--light-bg);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-menu a {
  color: var(--secondary-color);
  font-weight: 500;
  transition: var(--transition);
}

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

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  background: none;
  border: none;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--primary-color);
  margin: 5px 0;
  transition: var(--transition);
}

/* ==================== Hero Section ==================== */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  justify-items: center;
  min-height: 100vh;
  width: 100%;
}

.hero-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.hero-content h1 {
  margin-bottom: var(--spacing-md);
}

.hero-content p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.social-links {
  display: flex;
  gap: 0.6rem;
  margin-top: 0.8rem;
  flex-wrap: nowrap;
  align-items: center;
  height: fit-content;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-weight: 500;
  transition: var(--transition);
  font-size: 0.85rem;
  color: var(--primary-color);
  text-decoration: none;
  border: 1px solid transparent;
  line-height: 1;
}

.social-links a:nth-child(4) {
  padding: 0;
}

.social-links svg {
  width: 25px;
  height: 25px;
}

.social-links a:nth-child(1) svg {
  width: 20px;
  height: 20px;
}

.social-links a:nth-child(4) svg {
  width: 109px;
  height: 109px;
}

.social-links a:nth-child(4) span {
  display: none;
}

.social-links i {
  width: 25px;
  height: 25px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.social-links a:nth-child(1):hover {
  background-color: #0077b5;
  color: var(--light-bg);
  box-shadow: 0 4px 12px rgba(0, 119, 181, 0.25);
}

.social-links a:nth-child(2):hover {
  background-color: #000000;
  color: var(--light-bg);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.social-links a:nth-child(3):hover {
  background-color: #0077b5;
  color: var(--light-bg);
  box-shadow: 0 4px 12px rgba(0, 119, 181, 0.25);
}


.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-image img {
  width: 100%;
  max-width: 400px;
  height: 500px;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  object-fit: cover;
  object-position: center;
  transition: var(--transition);
  cursor: pointer;
}

.hero-image img:hover {
  transform: scale(1.15);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.3);
}

/* ==================== Container ==================== */
main {
  flex: 1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* ==================== Selected Papers Section ==================== */
.selected-papers {
  padding: var(--spacing-xl) var(--spacing-lg);
  background: var(--light-bg);
  border-top: 1px solid var(--border-color);
}

.selected-papers .container {
  padding: 0;
}

.selected-papers h2 {
  margin-top: 0;
}

.papers-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

/* ==================== Publication Card ==================== */
.paper-card {
  display: flex;
  gap: var(--spacing-lg);
  background-color: var(--light-bg);
  border: 2px solid transparent;
  border-radius: 8px;
  padding: var(--spacing-lg);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.paper-card-image {
  flex-shrink: 0;
  width: 25%;
  min-width: 120px;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 6px;
}

.paper-mockup-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.paper-card-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 6px;
}

.paper-card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.paper-card:hover {
  box-shadow: 0 12px 32px rgba(37, 99, 235, 0.15);
  border-color: var(--accent-color);
  transform: translateY(-4px);
}

.paper-card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--primary-color);
}

.paper-authors {
  font-size: 0.95rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-sm);
  font-style: italic;
}

.paper-tldr {
  font-size: 0.95rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-md);
  background-color: var(--light-gray);
  padding: var(--spacing-md);
  border-left: 3px solid var(--accent-color);
  border-radius: 4px;
}

.paper-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  font-size: 0.9rem;
  color: var(--secondary-color);
}

.paper-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.paper-links a {
  padding: 0.5rem 1rem;
  background-color: var(--light-gray);
  border-radius: 4px;
  font-size: 0.9rem;
  transition: var(--transition);
}

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

.bibtex-section {
  margin-top: var(--spacing-md);
  display: none;
}

.bibtex-section.show {
  display: block;
}

.bibtex-code {
  background-color: var(--light-gray);
  padding: var(--spacing-md);
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.85rem;
  overflow-x: auto;
  margin-top: var(--spacing-sm);
}

/* ==================== Publications Page ==================== */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.publications-header {
  margin-bottom: var(--spacing-lg);
}

.publications-header p {
  font-size: 1.05rem;
}

/* ==================== CV Page ==================== */
.cv-section {
  margin-bottom: var(--spacing-xl);
}

.cv-section h3 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--accent-color);
}

.cv-item {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-lg);
}

.cv-item-title {
  font-weight: 600;
  color: var(--primary-color);
}

.cv-item-subtitle {
  color: var(--secondary-color);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-sm);
}

.cv-item-date {
  color: var(--secondary-color);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-sm);
}

.cv-pdf-link {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--accent-color);
  color: var(--light-bg);
  border-radius: 4px;
  margin-bottom: var(--spacing-lg);
  transition: var(--transition);
}

.cv-pdf-link:hover {
  background-color: var(--primary-color);
}

/* ==================== Footer ==================== */
footer {
  background-color: #2d2d2d;
  border-top: 1px solid #1a1a1a;
  padding: var(--spacing-xl) var(--spacing-lg);
  margin-top: auto;
  text-align: center;
  color: #999999;
  font-size: 0.9rem;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--light-bg);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
  }

  .nav-menu.show {
    display: flex;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: var(--spacing-lg);
    gap: var(--spacing-lg);
  }

  .hero-image {
    order: -1;
  }

  .hero-image img {
    max-width: 300px;
  }

  .papers-grid {
    grid-template-columns: 1fr;
  }

  .paper-card {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .paper-card-image {
    width: 100%;
    aspect-ratio: 1 / 1;
    min-width: unset;
  }

  .paper-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .social-links {
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .social-links a {
    padding: 0.2rem 0.5rem;
    font-size: 0.75rem;
  }

  .social-links a:nth-child(4) {
    padding: 0;
  }

  .social-links svg,
  .social-links i {
    width: 20px;
    height: 20px;
  }

  .social-links a:nth-child(1) svg {
    width: 14px;
    height: 14px;
  }

  .social-links a:nth-child(4) svg {
    width: 83px;
    height: 83px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .nav-container {
    padding: var(--spacing-md);
  }

  .nav-brand {
    font-size: 1rem;
  }

  .hero-content p {
    font-size: 1rem;
  }

  .hero-image img {
    max-width: 250px;
  }

  .paper-links {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .paper-links a {
    text-align: center;
  }

  .social-links a span {
    display: none;
  }
}