:root {
      --primary: #2c5aa0;
      --primary-light: #3a6dc2;
      --primary-dark: #1e3f73;
      --secondary: #6c757d;
      --light: #f8f9fa;
      --dark: #212529;
      --gray-100: #f8f9fa;
      --gray-200: #e9ecef;
      --gray-300: #dee2e6;
      --gray-400: #ced4da;
      --gray-500: #adb5bd;
      --gray-600: #6c757d;
      --gray-700: #495057;
      --gray-800: #343a40;
      --gray-900: #212529;
      --success: #198754;
      --border-radius: 8px;
      --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 15px rgba(0, 0, 0, 0.1);
      --transition: all 0.3s ease;
    }

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

    body {
      font-family: 'Inter', sans-serif;
      line-height: 1.6;
      color: var(--gray-800);
      background-color: var(--gray-100);
      transition: var(--transition);
    }

    body.dark {
      background-color: var(--gray-900);
      color: var(--gray-200);
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Header Styles */
    header {
      background-color: white;
      box-shadow: var(--shadow-sm);
      position: sticky;
      top: 0;
      z-index: 1000;
      transition: var(--transition);
    }

    body.dark header {
      background-color: var(--gray-800);
    }

    .header-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1rem 0;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--dark);
      font-weight: 700;
      font-size: 1.25rem;
    }

    body.dark .logo {
      color: white;
    }

    .logo-img {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      object-fit: cover;
    }

    .nav-menu {
      display: flex;
      list-style: none;
      gap: 2rem;
      align-items: center;
    }

    .nav-link {
      text-decoration: none;
      color: var(--gray-700);
      font-weight: 500;
      transition: var(--transition);
      position: relative;
    }

    body.dark .nav-link {
      color: var(--gray-300);
    }

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

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -5px;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: var(--transition);
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .theme-toggle {
      background: none;
      border: none;
      cursor: pointer;
      font-size: 1.25rem;
      color: var(--gray-700);
      transition: var(--transition);
    }

    body.dark .theme-toggle {
      color: var(--gray-300);
    }

    .theme-toggle:hover {
      color: var(--primary);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--gray-700);
      cursor: pointer;
    }

    body.dark .mobile-menu-btn {
      color: var(--gray-300);
    }

    /* Hero Section */
    .hero {
      padding: 4rem 0;
      background: linear-gradient(135deg, rgba(44, 90, 160, 0.05) 0%, rgba(255, 255, 255, 0.1) 100%);
      margin-bottom: 3rem;
      transition: var(--transition);
    }

    body.dark .hero {
      background: linear-gradient(135deg, rgba(44, 90, 160, 0.1) 0%, rgba(33, 37, 41, 0.2) 100%);
    }

    .hero-content {
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-image {
      width: 100%;
      max-width: 300px;
      border-radius: 50%;
      box-shadow: var(--shadow-lg);
      justify-self: center;
    }

    .hero-text h1 {
      font-size: 2.5rem;
      margin-bottom: 0.5rem;
      color: var(--primary);
    }

    .hero-text h2 {
      font-size: 1.5rem;
      font-weight: 500;
      color: var(--gray-700);
      margin-bottom: 1.5rem;
    }

    body.dark .hero-text h2 {
      color: var(--gray-400);
    }

    .hero-text p {
      margin-bottom: 1.5rem;
      font-size: 1.1rem;
    }

    .btn {
      display: inline-block;
      padding: 0.75rem 1.5rem;
      background-color: var(--primary);
      color: white;
      border: none;
      border-radius: var(--border-radius);
      font-weight: 500;
      text-decoration: none;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

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

    .btn-outline {
      background-color: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
    }

    .social-icons {
      display: flex;
      gap: 1rem;
      margin: 1.5rem 0;
    }

    .social-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background-color: var(--gray-200);
      color: var(--gray-700);
      text-decoration: none;
      transition: var(--transition);
    }

    body.dark .social-icon {
  background-color: var(--gray-700);
  color: var(--gray-300);
}

    .social-icon:hover {
      background-color: var(--primary);
      color: white;
      transform: translateY(-3px);
    }

    /* Section Styles */
    section {
      padding: 3rem 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
      position: relative;
      color: var(--primary);
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background-color: var(--primary);
    }

    .card {
      background-color: white;
      border-radius: var(--border-radius);
      box-shadow: var(--shadow-md);
      padding: 2rem;
      margin-bottom: 2rem;
      transition: var(--transition);
    }

    body.dark .card {
      background-color: var(--gray-800);
    }

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

    /* About Section */
    .about-extra {
      margin-top: 2rem;
      padding-top: 2rem;
      border-top: 1px solid var(--gray-300);
    }

    body.dark .about-extra {
      border-top: 1px solid var(--gray-700);
    }

    .motto {
      font-style: italic;
      color: var(--primary);
      text-align: center;
      margin-bottom: 1rem;
    }

    .slogan {
      text-align: center;
      font-weight: 500;
      margin-bottom: 1rem;
    }

    .fav-quote {
      text-align: center;
      font-style: italic;
      color: var(--gray-600);
      padding: 1rem;
      border-left: 3px solid var(--primary);
      background-color: var(--gray-100);
    }

    body.dark .fav-quote {
      color: var(--gray-400);
      background-color: var(--gray-800);
    }

    /* Experience Section */
    .timeline {
      position: relative;
      max-width: 800px;
      margin: 0 auto;
    }

    .timeline::before {
      content: '';
      position: absolute;
      left: 30px;
      top: 0;
      height: 100%;
      width: 2px;
      background-color: var(--primary);
    }

    .timeline-item {
      display: flex;
      margin-bottom: 2rem;
      position: relative;
    }

    .timeline-dot {
      min-width: 60px;
      height: 60px;
      border-radius: 50%;
      background-color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.5rem;
      z-index: 1;
    }

    .timeline-content {
      margin-left: 1.5rem;
      flex: 1;
    }

    .timeline-content h3 {
      margin-bottom: 0.5rem;
      color: var(--primary);
    }

    .period {
      display: inline-block;
      background-color: var(--gray-200);
      color: var(--gray-700);
      padding: 0.25rem 0.75rem;
      border-radius: 20px;
      font-size: 0.85rem;
      margin-bottom: 1rem;
    }

    body.dark .period {
      background-color: var(--gray-700);
      color: var(--gray-300);
    }

    .skills-section {
      margin-top: 3rem;
    }

    .skills-list {
      list-style-type: none;
      margin-bottom: 1.5rem;
    }

    .skills-list li {
      margin-bottom: 0.5rem;
      padding-left: 1.5rem;
      position: relative;
    }

    .skills-list li::before {
      content: '•';
      color: var(--primary);
      font-weight: bold;
      position: absolute;
      left: 0;
    }

    /* Projects Section */
    .project-gallery {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 2rem;
    }

    .project-card {
      background-color: white;
      border-radius: var(--border-radius);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      transition: var(--transition);
    }

    body.dark .project-card {
      background-color: var(--gray-800);
    }

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

    .project-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .project-info {
      padding: 1.5rem;
    }

    .project-info h3 {
      margin-bottom: 0.5rem;
      color: var(--primary);
    }

    .skills-used {
      color: var(--gray-600);
      font-size: 0.9rem;
      margin: 0.5rem 0;
    }

    body.dark .skills-used {
      color: var(--gray-400);
    }

    /* Contact Section */
    #contact-form {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
      max-width: 800px;
      margin: 0 auto;
    }

    #contact-form input,
    #contact-form textarea {
      padding: 0.75rem;
      border: 1px solid var(--gray-300);
      border-radius: var(--border-radius);
      font-family: inherit;
      transition: var(--transition);
    }

    body.dark #contact-form input,
    body.dark #contact-form textarea {
      background-color: var(--gray-700);
      border-color: var(--gray-600);
      color: var(--gray-200);
    }

    #contact-form input:focus,
    #contact-form extreme:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(44, 90, 160, 极.2);
    }

    #contact-form textarea {
      grid-column: 1 / -1;
      min-height: 150px;
      resize: vertical;
    }

    #contact-form button {
      grid-column: 1 / -1;
      justify-self: center;
    }

    .contact-details {
      margin-top: 3rem;
      text-align: center;
    }

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

    /* Modal Styles */
    .modal {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(0, 0, 0, 0.5);
      z-index: 1001;
      align-items: center;
      justify-content: center;
    }

    .modal-content {
      background-color: white;
      border-radius: var(--border-radius);
      box-shadow: var(--shadow-lg);
      width: 90%;
      max-width: 500px;
      padding: 2rem;
      position: relative;
      transform: translateY(-50px);
      opacity: 0;
      transition: all 0.3s ease;
    }

    body.dark .modal-content {
      background-color: var(--gray-800);
    }

    .modal.active .modal-content {
      transform: translateY(0);
      opacity: 1;
    }

    .close-modal {
      position: absolute;
      top: 1rem;
      right: 1rem;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--极ray-600);
    }

    body.dark .close-modal {
      color: var(--gray-400);
    }

    .modal-title {
      color: var(--primary);
      margin-bottom: 1rem;
      text-align: center;
    }

    .modal-icon {
      display: block;
      text-align: center;
      font-size: 3rem;
      color: var(--primary);
      margin-bottom: 1rem;
    }

    .modal-text {
      margin-bottom: 1.5rem;
      text-align: center;
    }

    .form-group {
      margin-bottom: 1.5rem;
    }

    .form-label {
      display: block;
      margin-bottom: 0.5rem;
      font-weight: 500;
    }

    .form-input {
      width: 100%;
      padding: 0.75rem;
      border: 1px solid var(--gray-300);
      border-radius: var(--border-radius);
      font-family: inherit;
      transition: var(--transition);
    }

    body.dark .form-input {
      background-color: var(--gray-700);
      border-color: var(--gray-600);
      color: var(--gray-200);
    }

    .form-input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(44, 90, 160, 0.2);
    }

    .whatsapp-link {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      margin-top: 1rem;
      padding: 0.75rem 1.5rem;
      background-color: #25D366;
      color: white;
      text-decoration: none;
      border-radius: var(--border-radius);
      font-weight: 500;
      transition: var(--transition);
    }

    .whatsapp-link:hover {
      background-color: #128C7E;
      transform: translateY(-2px);
    }

    .error-message {
      color: #dc3545;
      font-size: 0.875rem;
      margin-top: 0.5rem;
      display: none;
    }

    body.dark .error-message {
      color: #f8d7da;
    }

    .success-message {
      color: var(--success);
      font-size: 1rem;
      margin: 1rem 0;
      text-align: center;
      display: none;
    }

    .download-btn {
      display: none;
      width: 100%;
      justify-content: center;
      align-items: center;
      gap: 0.5rem;
      margin-top: 1.5rem;
      padding: 0.75rem 1.5rem;
      background-color: var(--success);
      color: white;
      text-decoration: none;
      border-radius: var(--border-radius);
      font-weight: 500;
      transition: var(--transition);
    }

    .download-btn:hover {
      background-color: #0f6848;
      transform: translateY(-2px);
    }

    /* Footer */
    footer {
      background-color: var(--gray-800);
      color: white;
      padding: 3rem 0 1.5rem;
      margin-top: 4rem;
    }

    .footer-content {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 2rem;
      margin-bottom: 2rem;
    }

    .footer-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 1rem;
      color: white;
      text-decoration: none;
      font-weight: 700;
      font-size: 1.25rem;
    }

    .footer-logo-img {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      object-fit: cover;
    }

    .footer-heading {
      color: white;
      margin-bottom: 1rem;
      position: relative;
      padding-bottom: 0.5rem;
    }

    .footer-heading::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 40px;
      height: 2px;
      background-color: var(--primary);
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 0.5rem;
    }

    .footer-links a {
      color: var(--gray-400);
      text-decoration: none;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: white;
      padding-left: 5px;
    }

    .footer-social {
      display: flex;
      gap: 1rem;
      margin-top: 1rem;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 1.5rem;
      border-top: 1px solid var(--gray-700);
      color: var(--gray-400);
      font-size: 0.9rem;
    }

    .footer-bottom a {
      color: var(--gray-400);
      text-decoration: none;
      transition: var(--transition);
    }

    .footer-bottom a:hover {
      color: white;
    }

    /* Responsive Design */
    @media (max-width: 992px) {
      .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
      }
      
      .social-icons {
        justify-content: center;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background-color: white;
        width: 100%;
        height: calc(100vh - 70px);
        padding: 2rem;
        box-shadow: var(--shadow-md);
        transition: var(--transition);
        gap: 2rem;
      }

      body.dark .nav-menu {
        background-color: var(--gray-800);
      }

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

      .mobile-menu-btn {
        display: block;
      }

      #contact-form {
        grid-template-columns: 1fr;
      }

      .timeline::before {
        left: 15px;
      }

      .timeline-dot {
        min-width: 40px;
        height: 40px;
        font-size: 1rem;
      }
    }

    /* Animation */
    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .reveal.active {
      opacity: 1;
      transform: translateY(0);
    }