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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: #374151;
  background: linear-gradient(135deg, #ffffff 0%, #ffffff 50%, #ffffff 100%);
  min-height: 100vh;
  font-size: 16px; /* Ensure minimum font size for mobile */
}

.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Navigation */
.navbar {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-icon {
  font-size: 2rem;
  color: #07bf78;
}

.nav-title {
  font-size: 1.25rem;
  font-weight: bold;
  color: #111827;
}

.nav-menu {
  display: flex;
  gap: 2rem;
}

.nav-link {
  color: #374151;
  text-decoration: none;
  transition: color 0.3s ease;
  padding: 0.5rem 1rem; /* Better touch targets */
  border-radius: 0.25rem;
}

.nav-link:hover,
.nav-link.active {
  color: #07bf78;
  font-weight: 500;
}

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

.hamburger span {
  width: 25px;
  height: 3px;
  background: #374151;
  margin: 3px 0;
  transition: 0.3s;
}

/* Hero Section */
.hero {
  padding: 3rem 1rem 2rem; /* Reduced padding for mobile */
  text-align: center;
}

.hero-title {
  font-size: clamp(2rem, 6vw, 4rem); /* Better responsive scaling */
  font-weight: bold;
  color: #111827;
  margin-bottom: 1rem;
  line-height: 1.1; /* Tighter line height for mobile */
}

.accent {
  color: #07bf78;
}

.hero-subtitle {
  font-size: clamp(1rem, 3vw, 1.5rem);
  color: #6b7280;
  margin-bottom: 1.5rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.4;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.badge {
  background: #f3f4f6;
  color: #374151;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
}

/* About Section */
.about {
  padding: 2rem 1rem;
}

.card {
  background: white;
  border-radius: 0.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  margin-bottom: 1.5rem; /* Reduced margin for mobile */
  overflow: hidden;
}

.card-header {
  padding: 1rem; /* Reduced padding for mobile */
  border-bottom: 1px solid #e5e7eb;
}

.card-header h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem; /* Slightly smaller on mobile */
  font-weight: bold;
  color: #111827;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.card-icon {
  color: #07bf78;
}

.card-description {
  color: #6b7280;
  margin: 0;
}

.card-content {
  padding: 1rem; /* Reduced padding for mobile */
}

.about-intro {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.5rem; /* Reduced padding for mobile */
  flex-direction: column; /* Stack on mobile by default */
  text-align: center;
}

.avatar {
  width: 6rem; /* Smaller avatar on mobile */
  height: 6rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
  font-weight: bold;
  flex-shrink: 0;
  align-self: center;
  overflow: hidden;
  border: 4px solid #e5e7eb;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.intro-text h2 {
  font-size: 1.5rem;
  font-weight: bold;
  color: #111827;
  margin-bottom: 1rem;
}

.intro-text p {
  color: #6b7280;
  margin-bottom: 1rem;
  line-height: 1.7;
}

/* Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.timeline-item {
  border-left: 4px solid #bffede;
  padding-left: 1.5rem;
}

.timeline-item h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: #111827;
  margin-bottom: 0.25rem;
}

.institution {
  color: #07bf78;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.year {
  color: #6b7280;
  margin-bottom: 0.25rem;
}

.focus {
  color: #6b7280;
  font-size: 0.875rem;
}

/* Research List */
.research-list {
  list-style: none;
}

.research-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  color: #374151;
}

.research-list li::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  background: #07bf78;
  border-radius: 50%;
  margin-top: 0.5rem;
  flex-shrink: 0;
}

/* Publications */
.publication {
  background: #f9fafb;
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}

.publication h4 {
  font-weight: 600;
  color: #111827;
  margin-bottom: 0.5rem;
}

.journal {
  color: #07bf78;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.status-badge {
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.published {
  background: #dcfce7;
  color: #166534;
}

.under-review {
  background: #fef3c7;
  color: #92400e;
}

/* Blog Posts */
.blog-posts {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.blog-post {
  border-left: 4px solid #b5fddf;
  padding-left: 1.5rem;
}

.blog-post h4 {
  margin-bottom: 0.5rem;
}

.blog-post h4 a {
  color: #111827;
  text-decoration: none;
  font-size: 1.125rem;
  font-weight: 600;
  transition: color 0.3s ease;
}

.blog-post h4 a:hover {
  color: #07bf78;
}

.post-date {
  color: #6b7280;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.post-excerpt {
  color: #6b7280;
  margin-bottom: 0.5rem;
}

.read-more {
  color: #07bf78;
  text-decoration: none;
  font-weight: 500;
}

.read-more:hover {
  text-decoration: underline;
}

/* Fun Facts */
.fun-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.fact-column h4 {
  font-weight: 600;
  color: #111827;
  margin-bottom: 0.5rem;
}

.fact-column ul {
  list-style: none;
}

.fact-column li {
  color: #6b7280;
  margin-bottom: 0.25rem;
}

/* Contact */
.contact-card {
  background: linear-gradient(135deg, #dbfeee, #faf5ff);
}

.text-center {
  text-align: center;
}

.contact-card h2 {
  font-size: 1.5rem;
  font-weight: bold;
  color: #111827;
  margin-bottom: 1rem;
}

.contact-card p {
  color: #6b7280;
  margin-bottom: 1.5rem;
}

.contact-buttons {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-direction: column; /* Stack buttons on mobile */
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem; /* Increased padding for better touch targets */
  border-radius: 0.375rem;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  min-height: 44px; /* iOS recommended minimum touch target */
  justify-content: center;
}

.btn-primary {
  background: #07bf78;
  color: white;
}

.btn-primary:hover {
  background: #07bf78;
}

.btn-outline {
  background: transparent;
  color: #374151;
  border-color: #d1d5db;
}

.btn-outline:hover {
  background: #f9fafb;
}

/* Footer */
.footer {
  background: #111827;
  color: white;
  padding: 1.5rem 1rem; /* Reduced padding */
  margin-top: 2rem;
}

.footer-content {
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  font-weight: 600;
}

.footer p {
  color: #9ca3af;
}

.footer i {
  color: inherit;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 4rem;
    flex-direction: column;
    background-color: white;
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    padding: 2rem 0;
  }

  .nav-menu.active {
    left: 0;
  }

  .hamburger {
    display: flex;
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }

  .hamburger.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }

  .about-intro {
    flex-direction: column;
    text-align: center;
  }

  .avatar {
    align-self: center;
  }

  .contact-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 200px;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 3rem 1rem;
  }

  .badges {
    flex-direction: column;
    align-items: center;
  }

  .fun-facts {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 640px) {
  .about-intro {
    flex-direction: row;
    text-align: left;
    padding: 2rem;
  }

  .avatar {
    width: 8rem;
    height: 8rem;
    font-size: 2.5rem;
  }

  .contact-buttons {
    flex-direction: row;
  }

  .contact-buttons .btn {
    width: auto;
  }

  .card-content {
    padding: 1.5rem;
  }

  .card-header {
    padding: 1.5rem;
  }

  .hero {
    padding: 5rem 1rem;
  }
}

@media (min-width: 768px) {
  .card-header h3 {
    font-size: 1.5rem;
  }

  .footer {
    padding: 2rem 1rem;
    margin-top: 4rem;
  }
}

/* Add better focus states for accessibility */
.btn:focus,
.nav-link:focus,
a:focus {
  outline: 2px solid #07bf78;
  outline-offset: 2px;
}

/* Improve mobile scrolling */
html {
  scroll-behavior: smooth;
}

/* Better mobile text selection */
::selection {
  background: #bfdbfe;
  color: #07bf78;
}

li {
  list-style: none;
}

a{
  color: green;
}