:root {
    --primary: #37474f;
    --secondary: #0288d1;
    --accent: #ff9800;
    --light: #eceff1;
    --dark: #212121;
    --white: #ffffff;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

  html {
    scroll-behavior: smooth;
    font-size: 16px;
  }

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background: linear-gradient(135deg, #e0f7fa 0%, #ffffff 100%);
    overflow-x: hidden;
  }

  .wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  /* Header Styles */
  header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(55, 71, 79, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    transition: var(--transition);
  }

  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
  }

  .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
  }

  .logo img {
    width: 40px;
    margin-right: 10px;
  }

  .nav-links {
    display: flex;
    list-style: none;
  }

  .nav-links li {
    margin-left: 2rem;
  }

  .nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
  }

  .nav-links a:hover {
    color: var(--accent);
  }

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

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

  /* Hero Section */
  .hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding: 8rem 0 4rem;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(2, 136, 209, 0.1) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
    animation: pulse 15s infinite alternate;
  }

  @keyframes pulse {
    0% { transform: scale(0.8); }
    100% { transform: scale(1.2); }
  }

  .hero-content {
    flex: 1;
    padding-right: 2rem;
  }

  .hero h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--primary);
    line-height: 1.2;
  }

  .hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--dark);
    max-width: 600px;
  }

  .hero-image {
    flex: 1;
    position: relative;
    height: 400px;
  }

  .hero-image img {
    position: absolute;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: var(--transition);
  }

  .hero-image img:nth-child(1) {
    width: 250px;
    top: 0;
    left: 0;
    z-index: 3;
    transform: rotate(-5deg);
  }

  .hero-image img:nth-child(2) {
    width: 280px;
    top: 50px;
    left: 150px;
    z-index: 2;
    transform: rotate(3deg);
  }

  .hero-image img:nth-child(3) {
    width: 220px;
    top: 150px;
    left: 50px;
    z-index: 1;
    transform: rotate(-2deg);
  }

  .hero-image img:hover {
    transform: scale(1.05) rotate(0deg);
    z-index: 4;
  }

  /* Main Content */
  main {
    padding: 4rem 0;
  }

  section {
    margin-bottom: 4rem;
    padding: 2rem;
    background: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  section.visible {
    opacity: 1;
    transform: translateY(0);
  }

  h2 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--secondary), var(--accent));
  }

  h3 {
    font-size: 1.5rem;
    color: var(--secondary);
    margin: 1.5rem 0 1rem;
  }

  p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
  }

  /* Code Blocks */
  pre {
    background: #f5f7f9;
    border-left: 4px solid var(--secondary);
    border-radius: 0 5px 5px 0;
    padding: 1rem;
    margin: 1.5rem 0;
    overflow: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
  }

  code {
    font-family: 'Courier New', monospace;
    color: #d63384;
  }

  /* Image Gallery */
  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .gallery-item {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
  }

  .gallery-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: var(--transition);
  }

  .gallery-item:hover {
    transform: translateY(-10px);
  }

  .gallery-item:hover img {
    transform: scale(1.1);
  }

  /* Back to Top Button */
  .back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--secondary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow);
    z-index: 999;
  }

  .back-to-top.visible {
    opacity: 1;
    visibility: visible;
  }

  .back-to-top:hover {
    background: var(--primary);
    transform: translateY(-5px);
  }

  /* Footer */
  footer {
    background: var(--primary);
    color: var(--white);
    padding: 3rem 0;
    text-align: center;
  }

  .footer-content {
    max-width: 800px;
    margin: 0 auto;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    list-style: none;
    margin: 1.5rem 0;
  }

  .footer-links li {
    margin: 0 1rem;
  }

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

  .footer-links a:hover {
    color: var(--accent);
  }

  .copyright {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
  }

  /* Responsive Design */
  @media (max-width: 1024px) {
    .hero {
      flex-direction: column;
      text-align: center;
      padding-top: 6rem;
    }

    .hero-content {
      padding-right: 0;
      margin-bottom: 3rem;
    }

    .hero h1 {
      font-size: 2.5rem;
    }

    .hero-image {
      width: 100%;
    }
  }

  @media (max-width: 768px) {
    .navbar {
      padding: 1rem;
    }

    .nav-links {
      display: none;
    }

    .hero h1 {
      font-size: 2rem;
    }

    section {
      padding: 1.5rem;
    }

    .gallery {
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
  }

  @media (max-width: 480px) {
    .hero h1 {
      font-size: 1.8rem;
    }

    .hero p {
      font-size: 1rem;
    }

    section {
      padding: 1rem;
    }

    h2 {
      font-size: 1.5rem;
    }

    h3 {
      font-size: 1.2rem;
    }
  }

  /* Animation Classes */
  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  .fade-in {
    animation: fadeIn 1s ease-in-out;
  }

  /* Utility Classes */
  .text-center {
    text-align: center;
  }

  .mt-1 { margin-top: 0.5rem; }
  .mt-2 { margin-top: 1rem; }
  .mt-3 { margin-top: 1.5rem; }
  .mt-4 { margin-top: 2rem; }
  .mt-5 { margin-top: 3rem; }

  .mb-1 { margin-bottom: 0.5rem; }
  .mb-2 { margin-bottom: 1rem; }
  .mb-3 { margin-bottom: 1.5rem; }
  .mb-4 { margin-bottom: 2rem; }
  .mb-5 { margin-bottom: 3rem; }

  .notice {
    background: rgba(255, 152, 0, 0.1);
    border-left: 4px solid var(--accent);
    padding: 1rem;
    margin: 1.5rem 0;
    border-radius: 0 4px 4px 0;
  }