:root {
  --primary-color: #2c3e50;
  --accent-color: #3498db;
  --accent-hover: #2980b9;
  --secondary-color: #34495e;
  --light-bg: #f8f9fa;
  --card-bg: #ffffff;
  --text-primary: #2c3e50;
  --text-secondary: #7f8c8d;
  --border-color: #e0e0e0;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-2: linear-gradient(135deg, #3498db 0%, #2c3e50 100%);
}

/* ============ Global Enhancements ============ */
body {
  background: linear-gradient(to bottom, #f8f9fa 0%, #ffffff 100%);
  font-smoothing: antialiased;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

/* ============ Header & Navigation ============ */
.site-header {
  background: var(--card-bg);
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all 0.3s ease;
}

.site-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-color) !important;
  text-decoration: none;
  position: relative;
  transition: all 0.3s ease;
}

.site-title:hover {
  color: var(--accent-color) !important;
  transform: translateY(-2px);
}

.site-title::after {
  content: '';
  position: absolute;
  width: 0;
  height: 3px;
  bottom: -5px;
  left: 0;
  background: var(--gradient-2);
  transition: width 0.3s ease;
}

.site-title:hover::after {
  width: 100%;
}

.site-nav .page-link {
  color: var(--text-primary);
  font-weight: 500;
  margin-left: 25px;
  padding: 8px 0;
  position: relative;
  transition: all 0.3s ease;
  text-decoration: none;
}

.site-nav .page-link::before {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 50%;
  background: var(--accent-color);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.site-nav .page-link:hover {
  color: var(--accent-color);
}

.site-nav .page-link:hover::before {
  width: 100%;
}

/* ============ Profile Section ============ */
.profile {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 30px;
  box-shadow: var(--shadow-lg);
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

.profile:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0,0,0,0.12);
}

.profile figure {
  position: relative;
  overflow: hidden;
  border-radius: 15px;
  margin-bottom: 25px;
}

.profile img {
  border-radius: 15px;
  transition: all 0.4s ease;
  box-shadow: var(--shadow-md);
}

.profile img:hover {
  transform: scale(1.05);
}

/* ============ Bio Section ============ */
.clearfix p {
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.clearfix p strong {
  color: var(--accent-color);
  font-weight: 600;
}

.clearfix p a {
  color: var(--accent-color);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: all 0.3s ease;
}

.clearfix p a:hover {
  border-bottom-color: var(--accent-color);
  color: var(--accent-hover);
}

/* ============ Research Highlights Cards ============ */
.research-summary {
  background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
  border-left: 4px solid var(--accent-color);
  padding: 25px;
  border-radius: 10px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.research-summary:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(5px);
}

.research-summary p {
  margin-bottom: 10px;
  font-size: 1rem;
}

.research-summary strong {
  color: var(--primary-color);
}

/* ============ News Section ============ */
.news {
  background: var(--card-bg);
  border-radius: 15px;
  padding: 35px;
  box-shadow: var(--shadow-md);
  margin-top: 40px;
  border: 1px solid var(--border-color);
}

.news h3 {
  color: var(--primary-color);
  font-size: 1.8rem;
  margin-bottom: 25px;
  padding-bottom: 15px;
  border-bottom: 3px solid var(--accent-color);
  position: relative;
}

.news h3::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 80px;
  height: 3px;
  background: var(--gradient-2);
}

.news-container {
  max-height: 600px;
  overflow-y: auto;
  padding-right: 15px;
}

.news-container::-webkit-scrollbar {
  width: 8px;
}

.news-container::-webkit-scrollbar-track {
  background: var(--light-bg);
  border-radius: 10px;
}

.news-container::-webkit-scrollbar-thumb {
  background: var(--accent-color);
  border-radius: 10px;
  transition: all 0.3s ease;
}

.news-container::-webkit-scrollbar-thumb:hover {
  background: var(--accent-hover);
}

.news ul {
  list-style: none;
  margin-left: 0;
}

.news li {
  padding: 18px 20px;
  margin-bottom: 15px;
  background: var(--light-bg);
  border-radius: 10px;
  border-left: 4px solid var(--accent-color);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.news li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 4px;
  background: var(--gradient-2);
  transform: scaleY(0);
  transition: transform 0.3s ease;
}

.news li:hover {
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  transform: translateX(10px);
  border-left-color: transparent;
}

.news li:hover::before {
  transform: scaleY(1);
}

.news-date {
  color: var(--accent-color);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-block;
  min-width: 100px;
}

.news-content {
  color: var(--text-primary);
  line-height: 1.6;
}

/* ============ Contact & Social Links ============ */
.address {
  background: var(--light-bg);
  padding: 20px;
  border-radius: 10px;
  margin-bottom: 20px;
  border-left: 4px solid var(--accent-color);
}

.address p {
  margin-bottom: 12px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 12px;
}

.address i {
  color: var(--accent-color);
  font-size: 1.1rem;
}

.address a {
  color: var(--accent-color);
  text-decoration: none;
  transition: all 0.3s ease;
}

.address a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.social .contact-icons {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.social .contact-icons a {
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--light-bg);
  border-radius: 50%;
  color: var(--text-primary);
  transition: all 0.3s ease;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.social .contact-icons a:hover {
  background: var(--accent-color);
  color: white;
  transform: translateY(-5px) scale(1.1);
  box-shadow: var(--shadow-md);
}

/* ============ Publications Section ============ */
.publication-wrapper {
  margin: 30px 0;
}

.publication-wrapper ol {
  counter-reset: publication-counter;
  list-style: none;
  margin-left: 0;
}

.publication-wrapper li {
  counter-increment: publication-counter;
  position: relative;
  padding: 25px;
  margin-bottom: 20px;
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.publication-wrapper li::before {
  content: counter(publication-counter);
  position: absolute;
  left: -15px;
  top: 25px;
  background: var(--gradient-2);
  color: white;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: var(--shadow-md);
}

.publication-wrapper li:hover {
  box-shadow: var(--shadow-lg);
  transform: translateX(10px);
  border-color: var(--accent-color);
}

.publication-wrapper .author {
  line-height: 1.8;
  color: var(--text-primary);
}

.publication-wrapper .author b {
  color: var(--accent-color);
  font-weight: 600;
}

.publication-wrapper .title {
  color: var(--primary-color);
  font-weight: 600;
  font-size: 1.05rem;
  margin: 10px 0;
}

.publication-wrapper .journal,
.publication-wrapper .booktitle {
  color: var(--text-secondary);
  font-style: italic;
}

.publication-wrapper .note {
  display: inline-block;
  background: #fef3cd;
  color: #856404;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  margin-top: 8px;
  font-weight: 500;
}

.publication-wrapper hr {
  border: none;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border-color), transparent);
  margin: 20px 0 0 0;
}

/* ============ Awards Section ============ */
.post-content h2 {
  color: var(--primary-color);
  font-size: 2rem;
  margin: 40px 0 25px 0;
  padding-bottom: 15px;
  border-bottom: 3px solid var(--accent-color);
  position: relative;
}

.post-content h2::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 100px;
  height: 3px;
  background: var(--gradient-2);
}

.post-content ul {
  list-style: none;
  margin-left: 0;
}

.post-content > ul > li {
  background: var(--card-bg);
  padding: 25px;
  margin-bottom: 20px;
  border-radius: 12px;
  border-left: 5px solid var(--accent-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.post-content > ul > li:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(8px);
}

.post-content > ul > li strong {
  color: var(--primary-color);
  font-size: 1.1rem;
}

.post-content > ul > li em {
  color: var(--text-secondary);
}

/* ============ Teaching Section ============ */
.post-content h3 {
  color: var(--accent-color);
  font-size: 1.4rem;
  margin: 30px 0 20px 0;
  padding-left: 15px;
  border-left: 4px solid var(--accent-color);
}

/* ============ Service Section ============ */
.post-content h3 {
  transition: all 0.3s ease;
}

.post-content h3:hover {
  padding-left: 25px;
  color: var(--accent-hover);
}

/* ============ Responsive Design ============ */
@media screen and (max-width: 768px) {
  .site-nav .page-link {
    margin-left: 15px;
  }

  .profile {
    margin-bottom: 30px;
    padding: 20px;
  }

  .news-container {
    max-height: 400px;
  }

  .publication-wrapper li::before {
    position: relative;
    left: 0;
    margin-bottom: 10px;
  }

  .post-content h2 {
    font-size: 1.6rem;
  }
}

/* ============ Animations ============ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.profile,
.news,
.publication-wrapper li,
.post-content > ul > li {
  animation: fadeInUp 0.6s ease-out;
}

/* ============ Print Styles ============ */
@media print {
  .site-header,
  .social,
  .site-footer {
    display: none;
  }

  body {
    background: white;
  }

  .profile,
  .news,
  .publication-wrapper li {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* ============ Accessibility ============ */
.news-container:focus,
a:focus,
button:focus {
  outline: 3px solid var(--accent-color);
  outline-offset: 2px;
}

/* ============ Loading States ============ */
.page-content {
  animation: fadeInUp 0.8s ease-out;
}

/* ============ Publication Links ============ */
.publication-links {
  margin-top: 12px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.pub-link {
  display: inline-block;
  padding: 6px 14px;
  background: var(--light-bg);
  color: var(--accent-color);
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.pub-link:hover {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.pub-link[style*="display:none"] {
  display: none !important;
}

/* ============ Utility Classes ============ */
.text-accent {
  color: var(--accent-color) !important;
}

.bg-gradient {
  background: var(--gradient-2) !important;
  color: white !important;
}

.card-hover {
  transition: all 0.3s ease;
}

.card-hover:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}