:root {
    --primary-color: #2563eb;
    --secondary-color: #3b82f6;
    --light-bg: #f9fafb;
    --dark-bg: #1f2937;
    --text-color: #111827;
    --dark-text: #f3f4f6;
    --accent-color: #10b981;
    --card-bg: #ffffff;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
    transition: background-color 0.3s, color 0.3s;
  }
  
  a {
    color: var(--primary-color);
    text-decoration: none;
  }
  
  a:hover {
    text-decoration: underline;
  }
  
  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
  }
  
  /* Header and Navigation */
  .navbar {
    background: white;
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 1000;
  }
  
  .nav-brand a {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
  }
  
/* Desktop Menu Styles */
.nav-menu {
    display: flex;
    gap: 1.5rem;
    list-style: none;
  }
  
  .nav-menu li:last-child {
    margin-left: auto;
  }
  
  .nav-menu a,
  .nav-menu button {
    font-size: 1rem;
    color: var(--text-color);
    transition: color 0.3s ease;
  }
  
  .nav-menu a:hover,
  .nav-menu button:hover {
    color: var(--primary-color);
  }
  
  /* Mobile Menu Styles */
  @media (max-width: 768px) {
    .nav-menu {
      position: fixed;
      top: 0;
      left: -100%;
      height: 100%;
      width: 100%;
      max-width: 320px;
      background-color: var(--card-bg);
      padding: 4rem 2rem 2rem;
      flex-direction: column;
      transform: translateX(0);
      transition: left 0.3s ease;
      z-index: 9998;
      box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    }
  
    .nav-menu.active {
      left: 0;
    }
  
    .nav-menu li {
      margin-bottom: 1.5rem;
    }
  
    .nav-menu a,
    .nav-menu button {
      font-size: 1.2rem;
      padding: 0.5rem 0;
    }
  
    .nav-menu .language-toggle,
    .nav-menu .theme-toggle {
      margin-top: 2rem;
      display: block;
    }
  
    .nav-menu .language-toggle a,
    .nav-menu .theme-toggle button {
      font-weight: 600;
      font-size: 1rem;
      background: transparent;
      border: 1px solid var(--primary-color);
      padding: 0.5rem 1rem;
      border-radius: 999px;
      transition: all 0.3s ease;
    }
  
    .nav-menu .language-toggle a:hover,
    .nav-menu .theme-toggle button:hover {
      background-color: var(--primary-color);
      color: white;
    }
  
    /* Dark Mode for Mobile Menu */
    html.dark-mode .nav-menu {
      background-color: var(--dark-bg);
      color: var(--dark-text);
    }
  
    html.dark-mode .nav-menu a,
    html.dark-mode .nav-menu button {
      color: var(--dark-text);
    }
  
    html.dark-mode .nav-menu .language-toggle a,
    html.dark-mode .nav-menu .theme-toggle button {
      border-color: var(--dark-text);
      color: var(--dark-text);
    }
  
    html.dark-mode .nav-menu .language-toggle a:hover,
    html.dark-mode .nav-menu .theme-toggle button:hover {
      background-color: var(--dark-text);
      color: var(--dark-bg);
    }
  }
  /* Desktop Menu Styles */
.nav-menu {
    display: flex;
    gap: 1.5rem;
    list-style: none;
  }
  
  .nav-menu li:last-child {
    margin-left: auto;
  }
  
  .nav-menu a,
  .nav-menu button {
    font-size: 1rem;
    color: var(--text-color);
    transition: color 0.3s ease;
  }
  
  .nav-menu a:hover,
  .nav-menu button:hover {
    color: var(--primary-color);
  }
  
  /* Mobile Menu Styles */
  @media (max-width: 768px) {
    .nav-menu {
      position: fixed;
      top: 0;
      left: -100%;
      height: 100%;
      width: 100%;
      max-width: 320px;
      background-color: var(--card-bg);
      padding: 4rem 2rem 2rem;
      flex-direction: column;
      transform: translateX(0);
      transition: left 0.3s ease;
      z-index: 9998;
      box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    }
  
    .nav-menu.active {
      left: 0;
    }
  
    .nav-menu li {
      margin-bottom: 1.5rem;
    }
  
    .nav-menu a,
    .nav-menu button {
      font-size: 1.2rem;
      padding: 0.5rem 0;
    }
  
    .nav-menu .language-toggle,
    .nav-menu .theme-toggle {
      margin-top: 2rem;
      display: block;
    }
  
    .nav-menu .language-toggle a,
    .nav-menu .theme-toggle button {
      font-weight: 600;
      font-size: 1rem;
      background: transparent;
      border: 1px solid var(--primary-color);
      padding: 0.5rem 1rem;
      border-radius: 999px;
      transition: all 0.3s ease;
    }
  
    .nav-menu .language-toggle a:hover,
    .nav-menu .theme-toggle button:hover {
      background-color: var(--primary-color);
      color: white;
    }
  
    /* Dark Mode for Mobile Menu */
    html.dark-mode .nav-menu {
      background-color: var(--dark-bg);
      color: var(--dark-text);
    }
  
    html.dark-mode .nav-menu a,
    html.dark-mode .nav-menu button {
      color: var(--dark-text);
    }
  
    html.dark-mode .nav-menu .language-toggle a,
    html.dark-mode .nav-menu .theme-toggle button {
      border-color: var(--dark-text);
      color: var(--dark-text);
    }
  
    html.dark-mode .nav-menu .language-toggle a:hover,
    html.dark-mode .nav-menu .theme-toggle button:hover {
      background-color: var(--dark-text);
      color: var(--dark-bg);
    }
  }
  .burger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    height: 21px;
    width: 30px;
    background: none;
    border: none;
    cursor: pointer;
  }
  
  .bar {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
  }
  
  /* Hero Section */
  .hero {
    display: flex;
    align-items: center;
    flex-direction: column;
    padding: 2rem 0;
    text-align: center;
  }
  
  .profile-image img {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: 1rem;
  }
  
  .name {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
  }
  
  .title {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--secondary-color);
    margin-bottom: 0.25rem;
  }
  
  .institution {
    font-size: 1rem;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
  }
  
  .motto {
    font-style: italic;
    font-size: 1.1rem;
    max-width: 600px;
  }
  
  /* Sections */
  .section {
    margin-top: 3rem;
  }
  
  .section h2 {
    font-size: 1.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
  }
  
  .section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
  }
  
  .section h4 {
    font-size: 1.25rem;
    font-weight: 600;
  }
  
  /* Cards */
  .card, .course-card, .publication-item, .project-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 1.5rem;
    transition: transform 0.2s;
  }
  
  .card:hover,
  .course-card:hover,
  .project-card:hover {
    transform: translateY(-5px);
  }
  
  .card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
  }
  
  /* Grid */
  .grid,
  .project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
  }
  
  /* Publications */
  .publication-item {
    margin-bottom: 2rem;
  }
  
  /* Courses */
  .course-card p {
    margin-bottom: 0.5rem;
  }
  
  /* Projects */
  .project-card .project-tag {
    font-size: 0.875rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
  }
  
  .project-links {
    margin-top: 0.5rem;
  }
  
  .project-links a {
    margin-right: 0.75rem;
  }
  
  /* Gallery */
  .gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }
  
  .gallery img {
    width: calc(33% - 1rem);
    height: 150px;
    object-fit: cover;
    border-radius: 0.5rem;
  }
  
  /* Contact Form */
  .contact-form {
    max-width: 600px;
    margin: 1rem 0;
  }
  
  .form-group {
    margin-bottom: 1.5rem;
  }
  
  .form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
  }
  
  .form-group input,
  .form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    font-size: 1rem;
  }
  
  .submit-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  .submit-button:hover {
    background-color: #1d4ed8;
  }
  
  .form-status {
    margin-top: 1rem;
    color: var(--accent-color);
  }
  
  /* Footer */
  footer {
    background: var(--dark-bg);
    color: var(--dark-text);
    padding: 2rem 0;
    margin-top: 3rem;
  }
  
  footer p {
    text-align: center;
    margin-bottom: 1rem;
  }
  
  .social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1rem;
  }
  
  .social-links a {
    color: var(--primary-color);
    font-weight: 500;
    transition: color 0.3s ease;
  }
  
  html.dark-mode .social-links a {
    color: var(--dark-text);
  }
  
  .social-links a:hover {
    color: var(--primary-color);
  }
  
  /* Dark Mode */
  html.dark-mode {
    background-color: var(--dark-bg);
    color: var(--dark-text);
  }
  
  html.dark-mode body {
    background-color: var(--dark-bg);
    color: var(--dark-text);
  }
  
  html.dark-mode .navbar {
    background-color: var(--dark-bg);
    color: var(--dark-text);
  }
  
  html.dark-mode .card,
  html.dark-mode .course-card,
  html.dark-mode .publication-item,
  html.dark-mode .project-card {
    background-color: var(--dark-bg);
    color: var(--dark-text);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: none;
  }
  
  html.dark-mode .form-group input,
  html.dark-mode .form-group textarea {
    background-color: #374151;
    color: white;
    border-color: #4b5563;
  }
  
  html.dark-mode .form-group input::placeholder,
  html.dark-mode .form-group textarea::placeholder {
    color: #9ca3af;
  }
  
  html.dark-mode .hero .profile-info {
    background-color: #111827;
    color: var(--dark-text);
    border-radius: 0.5rem;
    padding: 1rem;
  }
  
  html.dark-mode footer {
    background-color: #111827;
    color: var(--dark-text);
  }
  
  html.dark-mode a {
    color: var(--secondary-color);
  }
  
  html.dark-mode .social-links a {
    color: var(--dark-text);
  }
  html {
    transition: background-color 0.3s, color 0.3s;
  }
  
  html.dark-mode {
    transition: background-color 0.3s, color 0.3s;
  }
  html.dark-mode .nav-menu {
    background-color: var(--dark-bg);
    color: var(--dark-text);
  }
  
  html.dark-mode .nav-menu a,
  html.dark-mode .nav-menu button {
    color: var(--dark-text);
  }
  
  html.dark-mode .nav-menu .language-toggle a,
  html.dark-mode .nav-menu .theme-toggle button {
    border-color: var(--dark-text);
    color: var(--dark-text);
  }
  
  html.dark-mode .nav-menu .language-toggle a:hover,
  html.dark-mode .nav-menu .theme-toggle button:hover {
    background-color: var(--dark-text);
    color: var(--dark-bg);
  }


  .experience-block {
    margin-bottom: 2rem;
  }
  
  .position {
    font-weight: 600;
    font-size: 1.1rem;
  }
  
  .org {
    font-style: italic;
    margin-bottom: 0.5rem;
  }
  
  .date {
    float: right;
    font-size: 0.9rem;
    color: var(--text-muted);
  }
  

  /* Responsive */
  @media (max-width: 768px) {
    .nav-menu {
      position: fixed;
      top: 0;
      left: -100%;
      flex-direction: column;
      background: white;
      width: 100%;
      height: 100vh;
      padding-top: 4rem;
      transition: left 0.3s ease;
    }
  
    .nav-menu.active {
      left: 0;
    }
  
    .burger {
      display: flex;
    }
  
    .gallery img {
      width: 100%;
      height: auto;
    }
  }