/* Base Styles */
:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #f3f4f6;
    --text-color: #1f2937;
    --text-muted: #6b7280;
    --background-color: #ffffff;
    --card-background: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 0.5rem;
    --transition: all 0.3s ease;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
  }
  
  img {
    max-width: 100%;
    height: auto;
  }
  
  a {
    text-decoration: none;
    color: inherit;
  }
  
  ul {
    list-style: none;
  }
  
  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
  }
  
  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
  }
  
  .btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
  }
  
  .btn-primary:hover {
    background-color: var(--primary-hover);
  }
  
  .btn-outline {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
  }
  
  .btn-outline:hover {
    background-color: var(--secondary-color);
  }
  
  /* Header & Navigation */
  .header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
  }
  
  .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
  }
  
  .logo a {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
  }
  
  .nav-desktop ul {
    display: flex;
    gap: 1.5rem;
  }
  
  .nav-desktop a {
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
  }
  
  .nav-desktop a:hover {
    color: var(--primary-color);
  }
  
  .menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 1.5rem;
    height: 1.25rem;
    cursor: pointer;
  }
  
  .menu-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--text-color);
    transition: var(--transition);
  }
  
  .nav-mobile {
    display: none;
    background-color: var(--background-color);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
  }
  
  .nav-mobile ul {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-mobile a {
    display: block;
    padding: 0.5rem 0;
    font-weight: 500;
  }
  
  /* Hero Section */
  .hero {
    padding: 4rem 0;
    background: linear-gradient(to bottom, var(--background-color), var(--secondary-color));
  }
  
  .hero-content {
    display: flex;
    align-items: center;
    gap: 2rem;
  }
  
  .hero-text {
    flex: 1;
  }
  
  .hero-text h1 {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
  }
  
  .hero-text p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
  }
  
  .hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
  }
  
  .hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .profile-image {
    width: 15rem;
    height: 15rem;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--background-color);
    box-shadow: var(--shadow-lg);
  }
  
  .profile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  /* About Section */
  .about {
    padding: 4rem 0;
  }
  
  .about-content {
    display: flex;
    align-items: center;
    gap: 3rem;
  }
  
  .about-image {
    flex: 1;
    max-width: 400px;
  }
  
  .about-image img {
    border-radius: var(--radius);
    /* box-shadow: var(--shadow); */
  }
  
  .about-text {
    flex: 1;
  }
  
  .about-text h2 {
    font-size: 2rem;
    
  }
  
  .about-text p {
    margin-bottom: 1rem;
  }
  
  .social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
  }
  
  .social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--secondary-color);
    border-radius: var(--radius);
    font-size: 0.875rem;
    transition: var(--transition);
  }
  
  .social-link:hover {
    background-color: var(--border-color);
  }
  
  /* Section Header */
  .section-header {
    text-align: center;
    margin-bottom: 3rem;
  }
  
  .section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
  }
  
  .section-header p {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
  }
  
  /* Projects Section */
  .projects {
    padding: 4rem 0;
  }
  
  .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
  }
  
  .project-card {
    background-color: var(--card-background);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
  }
  
  .project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
  }
  
  .project-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
  }
  
  .project-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background-color: var(--secondary-color);
    border-radius: 50%;
    font-size: 1.25rem;
    color: var(--primary-color);
  }
  
  .project-header h3 {
    font-size: 1.25rem;
  }
  
  .project-body {
    padding: 0 1.5rem;
    flex-grow: 1;
  }
  
  .project-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
  }
  
  .project-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem 0;
    font-weight: 500;
    color: var(--text-color);
    transition: var(--transition);
  }
  
  .project-link:hover {
    color: var(--primary-color);
  }
  
  /* Book Section */
  .book {
    padding: 4rem 0;
    background-color: var(--secondary-color);
  }
  
  .book-content {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
  }
  
  .book-cover {
    flex: 0 0 300px;
  }
  
  .book-cover img {
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
  }
  
  .book-details {
    flex: 1;
  }
  
  .book-details h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
  }
  
  .book-details p {
    margin-bottom: 1rem;
  }
  
  .book-highlight {
    font-style: italic;
    margin: 1.5rem 0;
  }
  
  .purchase-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
  }
  
  /* Reviews Section */
  .reviews {
    padding: 4rem 0;
  }
  
  .reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
  }
  
  .review-card {
    background-color: var(--secondary-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
  }
  
  .review-author {
    margin-top: 1rem;
    font-weight: 600;
  }
  
  /* Contact Section */
  .contact {
    padding: 4rem 0;
    background-color: var(--secondary-color);
  }
  
  .contact-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
  }
  
  /* Footer */
  .footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
  }
  
  .footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .footer-social {
    display: flex;
    gap: 1rem;
  }
  
  .footer-social a {
    font-size: 1.25rem;
    color: var(--text-muted);
    transition: var(--transition);
  }
  
  .footer-social a:hover {
    color: var(--text-color);
  }
  
  /* Responsive Styles */
  @media (max-width: 992px) {
    .hero-text h1 {
      font-size: 2.5rem;
    }
  
    .book-content {
      flex-direction: column;
      align-items: center;
    }
  
    .book-cover {
      margin-bottom: 2rem;
    }
  }
  
  @media (max-width: 768px) {
    .nav-desktop {
      display: none;
    }
  
    .menu-toggle {
      display: flex;
    }
  
    .hero-content {
      flex-direction: column-reverse;
      text-align: center;
    }
  
    .hero-buttons {
      justify-content: center;
    }
  
    .about-content {
      flex-direction: column;
      text-align: center;
    }
  
    .social-links {
      justify-content: center;
    }
  
    .footer-content {
      flex-direction: column;
      gap: 1rem;
      text-align: center;
    }
  }
  
  @media (max-width: 576px) {
    .hero-text h1 {
      font-size: 2rem;
    }
  
    .section-header h2 {
      font-size: 2rem;
    }
  }
  
  /* Mobile Menu Active State */
  .nav-mobile.active {
    display: block;
  }
  
  .menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  
  .subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
  }