:root {
    --main-color: #0A3D62;
    --accent-color: #81C784;
    --highlight-color: #FF6B6B;
    --background-gradient: linear-gradient(135deg, #F5F5F5, #FFFFFF);
    --dark-main: #1E1E1E;
    --dark-bg: linear-gradient(135deg, #2C2C2C, #1E1E1E);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  @font-face {
    font-family: 'Roboto';
    src: url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.8;
    color: var(--main-color);
    background: var(--background-gradient);
    min-height: 100%;
    overflow-x: hidden;
  }

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

  .header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 15px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--main-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .nav {
    display: flex;
    gap: 30px;
  }

  .nav-link {
    color: var(--main-color);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: var(--transition);
  }

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

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

  .hero {
    padding: 150px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: -50px;
    left: -50px;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(129, 199, 132, 0.2) 0%, rgba(255, 255, 255, 0) 70%);
    z-index: -1;
  }

  .hero::after {
    content: '';
    position: absolute;
    bottom: -50px;
    right: -50px;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(10, 61, 98, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
    z-index: -1;
  }

  .hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--main-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero-subtitle {
    font-size: 20px;
    color: #666;
    max-width: 700px;
    margin: 0 auto 40px;
  }

  .notice {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid #eee;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
    box-shadow: var(--shadow);
  }

  .content-section {
    padding: 80px 0;
    position: relative;
  }

  .content-section:nth-child(even) {
    background: rgba(255, 255, 255, 0.7);
  }

  .section-title {
    font-size: 32px;
    margin-bottom: 40px;
    position: relative;
    display: inline-block;
  }

  .section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--accent-color);
  }

  article {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
  }

  article h2 {
    font-size: 28px;
    margin: 40px 0 20px;
    color: var(--main-color);
    position: relative;
    padding-left: 20px;
  }

  article h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    height: 80%;
    width: 5px;
    background: var(--accent-color);
    border-radius: 5px;
  }

  article p {
    font-size: 17px;
    margin-bottom: 20px;
    color: #555;
  }

  pre {
    background: #f8f8f8;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 30px 0;
    border-left: 4px solid var(--accent-color);
    font-family: 'Courier New', monospace;
    font-size: 15px;
    line-height: 1.5;
  }

  code {
    font-family: 'Courier New', monospace;
    color: #333;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .image-card {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
  }

  .image-card img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
  }

  .footer {
    background: var(--main-color);
    color: white;
    padding: 50px 0;
    text-align: center;
  }

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

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

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

  .btn {
    display: inline-block;
    padding: 12px 25px;
    background: var(--accent-color);
    color: white;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(129, 199, 132, 0.3);
  }

  .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(129, 199, 132, 0.4);
  }

  .btn-outline {
    background: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    box-shadow: none;
  }

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

  @media (max-width: 768px) {
    .hero-title {
      font-size: 36px;
    }
    
    .hero-subtitle {
      font-size: 18px;
    }
    
    .nav {
      display: none;
    }
    
    article {
      padding: 30px 20px;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Animations */
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .fade-in {
    animation: fadeIn 0.8s ease forwards;
  }

  .delay-1 { animation-delay: 0.2s; }
  .delay-2 { animation-delay: 0.4s; }
  .delay-3 { animation-delay: 0.6s; }