/* ===================================
   MAIN STYLESHEET
   =================================== */

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-base);
  color: var(--color-dark-blue);
  background-color: var(--color-white);
  overflow-x: hidden;
}

/* Skip Link (Accessibility) */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-sm);
  text-decoration: none;
  z-index: 9999;
}

.skip-link:focus {
  top: 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-heading);
  margin-bottom: var(--spacing-md);
  color: var(--color-dark-blue);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }
h5 { font-size: var(--font-size-h5); }
h6 { font-size: var(--font-size-h6); }

p {
  margin-bottom: var(--spacing-md);
}

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

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

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Section Styles */
section {
  padding: var(--spacing-section) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  margin: var(--spacing-md) auto 0;
  border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-family: var(--font-heading);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  text-decoration: none;
  border-radius: var(--border-radius-small);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-small {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-small);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-medium-gray);
  color: var(--color-dark-blue);
}

.btn-outline:hover {
  background: var(--color-light-gray);
}


/* Header & Navigation */
#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  transition: all var(--transition-base);
  background: transparent;
}

#header.scrolled {
  background: var(--color-white);
  box-shadow: var(--shadow-medium);
}

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

/* Logo Styles */
.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo a {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.logo a:hover {
  opacity: 0.85;
}

.logo a::after {
  display: none; /* Remove underline animation for logo */
}

/* Logo Image */
.logo img {
  height: 50px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: opacity var(--transition-fast);
}

#header.scrolled .logo img {
  height: 45px; /* Slightly smaller when scrolled */
}

/* Navigation Menu */
.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  font-weight: var(--font-weight-medium);
  color: var(--color-dark-blue);
  padding: 0.5rem 0;
  position: relative;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-fast);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

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

/* CV Link Button */
.cv-link {
  background: var(--gradient-primary);
  color: var(--color-white) !important;
  padding: 0.5rem 1rem !important;
  border-radius: var(--border-radius-small);
  margin-left: var(--spacing-sm);
}

.cv-link::after {
  display: none;
}

.cv-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
  opacity: 0.9;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  margin-left: var(--spacing-md);
}

.mobile-menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-dark-blue);
  transition: all var(--transition-fast);
  border-radius: 2px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .nav-container {
    padding: var(--spacing-sm) var(--container-padding);
  }
  
  /* Logo adjustments for mobile */
  .logo img {
    height: 40px;
  }
  
  #header.scrolled .logo img {
    height: 38px;
  }
  
  /* Show mobile menu toggle */
  .mobile-menu-toggle {
    display: flex;
  }
  
  /* Mobile menu */
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 2rem 2rem;
    box-shadow: var(--shadow-large);
    transition: right var(--transition-base);
    z-index: 999;
    gap: 0;
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid var(--color-light-gray);
  }
  
  .nav-menu li:last-child {
    border-bottom: none;
  }
  
  .nav-menu a {
    display: block;
    width: 100%;
    padding: 1rem 0;
    font-size: 1.125rem;
  }
  
  .cv-link {
    margin-left: 0 !important;
    margin-top: var(--spacing-sm);
    display: inline-block !important;
    width: auto !important;
    text-align: center;
  }
  
  /* Menu overlay */
  body.menu-open::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
  }
}

@media (max-width: 480px) {
  .logo img {
    height: 35px;
  }
  
  #header.scrolled .logo img {
    height: 33px;
  }
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 80px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-hero);
  z-index: -1;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.hero-text {
  animation: fadeInUp 1s ease;
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-sm);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--color-dark-blue);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xs);
}

.hero-institution {
  font-size: 1.125rem;
  color: var(--color-medium-gray);
  margin-bottom: var(--spacing-md);
}

.hero-tagline {
  font-size: 1.125rem;
  color: var(--color-medium-gray);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-image {
  animation: fadeIn 1.5s ease;
  position: relative;
}

.hero-image img {
  width: 100%;
  max-width: 400px;
  border-radius: var(--border-radius-large);
  box-shadow: var(--shadow-large);
  margin: 0 auto;
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-indicator span {
  display: block;
  width: 30px;
  height: 50px;
  border: 2px solid var(--color-primary);
  border-radius: 25px;
  position: relative;
}

.scroll-indicator span::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: scroll 2s infinite;
}

/* About Section */
.about-section {
  background: var(--color-light-gray);
}

.about-content p {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-dark-blue);
  margin-bottom: var(--spacing-lg);
}

/* Research Highlights */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.research-card {
  background: var(--color-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-base);
}

.research-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-large);
}

.card-image {
  height: 200px;
  overflow: hidden;
  position: relative;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.research-card:hover .card-image img {
  transform: scale(1.1);
}

.card-content {
  padding: var(--spacing-lg);
}

.card-content h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark-blue);
}

.card-content p {
  color: var(--color-medium-gray);
  margin-bottom: var(--spacing-md);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-light-gray);
  color: var(--color-primary);
  font-size: var(--font-size-small);
  border-radius: 20px;
  font-weight: var(--font-weight-medium);
}

.card-link {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.card-link:hover {
  gap: 0.75rem;
}

/* Publications Preview */
.publications-preview {
  background: var(--color-light-gray);
}

.publication-featured {
  background: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-medium);
  max-width: 900px;
  margin: 0 auto;
}

.publication-featured h3 {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark-blue);
}

.publication-meta {
  color: var(--color-medium-gray);
  font-size: var(--font-size-small);
  margin-bottom: var(--spacing-md);
}

.publication-abstract {
  line-height: 1.8;
  color: var(--color-dark-blue);
  margin-bottom: var(--spacing-md);
}

.publication-links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}


/* Education Timeline */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding-left: 80px;  
}

.timeline::before {
  content: '';
  position: absolute;
  left: 35px;  
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gradient-primary);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

.timeline-icon {
  position: absolute;
  left: -65px;  
  width: 90px; 
  height: 90px;  
  border-radius: 50%;
  background: var(--color-white);
  box-shadow: var(--shadow-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
  padding: 12px;  
}

.timeline-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.timeline-content {
  background: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-medium);
}

.timeline-date {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--gradient-primary);
  color: var(--color-white);
  border-radius: 20px;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
  margin-bottom: var(--spacing-xs);
}

.institution {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .timeline {
    padding-left: 70px;
  }

  .timeline::before {
    left: 30px;
  }

  .timeline-icon {
    left: -50px;
    width: 80px;
    height: 80px;
    padding: 10px;
  }
}

@media (max-width: 768px) {
  .timeline {
    padding-left: 55px;
  }

  .timeline::before {
    left: 25px;
  }

  .timeline-icon {
    left: -40px;
    width: 70px;
    height: 70px;
    padding: 8px;
  }

  .timeline-content {
    padding: var(--spacing-md);
  }
}

/* Contact Preview */
.contact-preview {
  text-align: center;
}

.contact-intro {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  color: var(--color-medium-gray);
}

.contact-info {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.125rem;
}

.contact-item i {
  color: var(--color-primary);
  font-size: 1.5rem;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-light-gray);
  color: var(--color-primary);
  font-size: 1.5rem;
  transition: all var(--transition-base);
}

.social-links a:hover {
  background: var(--gradient-primary);
  color: var(--color-white);
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
}

/* Footer */
#footer {
    background: var(--color-dark-blue);
    color: var(--color-white);
    padding: 5rem 0 2rem;
    position: relative;
    margin-top: 4rem;
}

#footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.footer-section {
    line-height: 1.6;
}

.footer-section h3 {
    color: var(--color-primary);
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    font-weight: 700;
    position: relative;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
}

.footer-section p {
    color: #ccc;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    margin-bottom: 0.8rem;
    cursor: pointer;
    min-height: 44px;
    padding: 0.5rem 0;
    border-radius: 4px;
    position: relative;
    font-size: 0.95rem;
}

.footer-section a:hover {
    color: var(--color-primary);
    transform: translateX(5px);
    background: rgba(102, 126, 234, 0.1);
    padding-left: 10px;
}

.footer-section a i {
    margin-right: 0.8rem;
    width: 20px;
    text-align: center;
    font-size: 1.1rem;
    transition: transform 0.3s ease;
}

.footer-section a:hover i {
    transform: scale(1.2);
    color: var(--color-primary);
}

/* First section (About) specific styles */
.footer-section:first-child p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.footer-section:first-child address {
    font-style: normal;
    color: #ccc;
    line-height: 1.6;
    margin-top: 1rem;
}

.footer-section:first-child strong {
    color: var(--color-primary);
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

/* Social media section (last) specific styles */
.footer-section:last-child a {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 0.8rem 1rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.footer-section:last-child a:hover {
    background: rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.15);
    padding-left: 1rem;
}

.footer-section:last-child a i {
    margin-right: 1rem;
    width: 24px;
    font-size: 1.2rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    margin-top: 4rem;
    text-align: center;
    color: #888;
    font-size: 0.9rem;
}

.footer-bottom p {
    margin: 0;
    padding: 1rem 0;
}

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-large);
    transition: all var(--transition-base);
    z-index: 999;
}

#back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

#back-to-top.visible {
    display: flex;
}

/* Responsive Footer */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }

    .footer-section:first-child {
        grid-column: 1 / -1;
        text-align: center;
        margin-bottom: 1rem;
    }

    .footer-section:first-child h3::after {
        left: 50%;
        transform: translateX(-50%);
    }
}

@media (max-width: 768px) {
    #footer {
        padding: 3rem 0 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        text-align: center;
        padding: 0 1rem;
    }

    .footer-section h3 {
        font-size: 1.3rem;
    }

    .footer-section h3::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .footer-section:first-child address {
        text-align: center;
        font-size: 0.95rem;
    }

    .footer-section a {
        justify-content: center;
        margin-bottom: 0.6rem;
        font-size: 0.9rem;
    }

    .footer-section:last-child a {
        padding: 0.8rem;
        margin-bottom: 0.8rem;
    }

    .footer-bottom {
        margin-top: 3rem;
        padding-top: 1.5rem;
    }

    .footer-bottom p {
        font-size: 0.85rem;
    }

    #back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .footer-section a {
        font-size: 0.85rem;
    }

    .footer-bottom p {
        font-size: 0.8rem;
    }
}

/* ===================================
   RESEARCH PAGE SPECIFIC STYLES
   =================================== */

/* Research Overview */
.research-overview {
    background: var(--color-white);
}

.research-intro {
    max-width: 900px;
    margin: 0 auto;
}

.research-intro p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

/* Current Research Highlight */
.current-research {
    background: var(--color-light-gray);
}

.research-highlight-box {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    max-width: 900px;
    margin: 0 auto;
    border-left: 4px solid var(--color-primary);
}

.research-highlight-box h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
}

.research-meta {
    color: var(--color-medium-gray);
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.research-meta i {
    color: var(--color-primary);
    margin-right: 0.5rem;
}

.research-questions {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--gradient-hero);
    border-radius: var(--border-radius-small);
}

.research-questions h4 {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.research-questions ul {
    list-style: none;
    padding-left: 0;
}

.research-questions li {
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    position: relative;
    line-height: 1.6;
}

.research-questions li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

/* Research Interests Grid */
.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.interest-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-base);
}

.interest-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-large);
}

.interest-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.interest-icon i {
    font-size: 1.75rem;
    color: var(--color-white);
}

.interest-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.interest-card p {
    color: var(--color-medium-gray);
    line-height: 1.6;
    margin: 0;
}

/* Research Projects */
.research-projects {
    background: var(--color-light-gray);
}

.project-item {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    margin-bottom: var(--spacing-lg);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.project-header h4 {
    flex: 1;
    margin: 0;
}

.project-status {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: var(--font-size-small);
    font-weight: var(--font-weight-semibold);
    white-space: nowrap;
}

.project-status.completed {
    background: var(--color-success);
    color: var(--color-white);
}

.project-status.in-progress {
    background: var(--color-warning);
    color: var(--color-white);
}

.project-meta {
    color: var(--color-medium-gray);
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-md);
}

.project-meta i {
    color: var(--color-primary);
}

.project-description {
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Collaboration Section */
.collaboration {
    background: var(--color-light-gray);
}

.collaboration-content {
    max-width: 900px;
    margin: 0 auto;
}

.collaboration-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.collaboration-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.collab-item {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    text-align: center;
    transition: all var(--transition-base);
}

.collab-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-large);
}

.collab-item i {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.collab-item h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.collab-item p {
    font-size: 0.9rem;
    color: var(--color-medium-gray);
    margin: 0;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .research-highlight-box {
        padding: var(--spacing-md);
    }
    
    .interests-grid {
        grid-template-columns: 1fr;
    }
    
    .project-item {
        padding: var(--spacing-md);
    }
    
    .project-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .collaboration-types {
        grid-template-columns: 1fr;
    }
}