:root {
    --primary: #1e3c72;
    --secondary: #2a5298;
    --accent: #00c6ff;
    --text: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  }

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

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

  body {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text);
    font-family: 'Roboto', sans-serif;
    line-height: 1.7;
    overflow-x: hidden;
  }

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

  /* Header */
  header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 0;
    background: rgba(30, 60, 114, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow);
  }

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

  .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
  }

  nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
  }

  nav a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
  }

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

  nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
  }

  nav a:hover::after {
    width: 100%;
  }

  /* Hero Section */
  .hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(0, 198, 255, 0.1), transparent 70%);
  }

  .hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
  }

  .hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
  }

  .hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
  }

  .hero-image {
    position: absolute;
    right: -50px;
    bottom: -50px;
    width: 500px;
    height: 500px;
    border-radius: 30px;
    transform: rotate(15deg);
    box-shadow: var(--shadow);
    overflow: hidden;
    opacity: 0.8;
  }

  .hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  /* Main Content */
  main {
    padding: 100px 0;
  }

  section {
    padding: 80px 0;
  }

  section:nth-child(even) {
    background: rgba(255, 255, 255, 0.05);
  }

  .section-header {
    text-align: center;
    margin-bottom: 60px;
  }

  .section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
  }

  .section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--accent);
    border-radius: 3px;
  }

  .section-header p {
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.8;
  }

  /* Cards */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
  }

  .card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
  }

  .card-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 198, 255, 0.1);
    border-radius: 50%;
    font-size: 24px;
    color: var(--accent);
  }

  .card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
  }

  /* Code Blocks */
  pre {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    padding: 20px;
    margin: 30px 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    position: relative;
    border-left: 3px solid var(--accent);
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent);
    color: #000;
    padding: 2px 10px;
    font-size: 0.8rem;
    border-bottom-left-radius: 5px;
  }

  code {
    font-family: 'Courier New', monospace;
    color: var(--accent);
  }

  /* Images */
  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .image-card {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
  }

  .image-card:hover {
    transform: scale(1.05);
  }

  .image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
  }

  .image-card:hover img {
    transform: scale(1.1);
  }

  /* Footer */
  footer {
    background: rgba(0, 0, 0, 0.2);
    padding: 50px 0;
    text-align: center;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
  }

  .footer-links a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.3s ease;
  }

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

  .copyright {
    opacity: 0.7;
    font-size: 0.9rem;
  }

  /* Animations */
  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-20px);
    }
  }

  .floating {
    animation: float 6s ease-in-out infinite;
  }

  @keyframes pulse {
    0% {
      transform: scale(1);
      opacity: 1;
    }
    50% {
      transform: scale(1.05);
      opacity: 0.8;
    }
    100% {
      transform: scale(1);
      opacity: 1;
    }
  }

  .pulse {
    animation: pulse 3s ease-in-out infinite;
  }

  /* Responsive */
  @media (max-width: 992px) {
    .hero h1 {
      font-size: 2.8rem;
    }

    .hero-image {
      width: 400px;
      height: 400px;
    }
  }

  @media (max-width: 768px) {
    html {
      font-size: 15px;
    }

    .hero {
      text-align: center;
    }

    .hero-image {
      position: relative;
      right: auto;
      bottom: auto;
      margin: 40px auto 0;
      width: 300px;
      height: 300px;
    }

    nav ul {
      gap: 15px;
    }

    .card-grid {
      grid-template-columns: 1fr;
    }
  }

  @media (max-width: 576px) {
    .hero h1 {
      font-size: 2.2rem;
    }

    nav ul {
      display: none;
    }
  }

  /* Utility */
  .btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--accent);
    color: #000;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 198, 255, 0.3);
  }

  .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 198, 255, 0.4);
  }

  .text-accent {
    color: var(--accent);
  }

  .mt-20 {
    margin-top: 20px;
  }

  .mt-40 {
    margin-top: 40px;
  }

  .mb-20 {
    margin-bottom: 20px;
  }

  .mb-40 {
    margin-bottom: 40px;
  }

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

  .notice {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 8px;
    margin: 30px 0;
    border-left: 3px solid var(--accent);
  }