:root {
    --primary: #0d47a1;
    --secondary: #1e88e5;
    --accent: #ff9800;
    --metal: #c0c0c0;
    --gold: #ffd700;
    --success: #4caf50;
    --text: #333;
    --light: #f5f7fa;
    --dark: #1a237e;
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
  }

  body {
    background: linear-gradient(135deg, var(--light) 0%, #e0e5ec 100%);
    color: var(--text);
    line-height: 1.6;
    padding-top: 80px;
  }

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

  .header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(13, 71, 161, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 15px 0;
  }

  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .logo {
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
  }

  .logo span {
    display: inline-block;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    margin-left: 8px;
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.3); }
    100% { transform: scale(1); }
  }

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

  .nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: all 0.3s ease;
  }

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

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

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

  .hero:before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(29, 136, 229, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
    z-index: -1;
    animation: rotate 30s linear infinite;
  }

  @keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
  }

  .hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradientShift 8s ease infinite;
    background-size: 200% 200%;
  }

  @keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }

  .hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    color: var(--text);
  }

  .notice {
    background: rgba(255, 255, 255, 0.9);
    border-left: 4px solid var(--accent);
    padding: 15px;
    margin: 30px 0;
    border-radius: 0 5px 5px 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  }

  .notice p {
    margin: 0;
    font-size: 0.9rem;
    color: #666;
  }

  .content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin: 50px 0;
  }

  .content-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .content-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
  }

  .card-header {
    padding: 20px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: white;
  }

  .card-header h2 {
    margin: 0;
    font-size: 1.5rem;
  }

  .card-body {
    padding: 25px;
  }

  .card-body p {
    margin-bottom: 15px;
    font-size: 1rem;
  }

  .card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
  }

  .card-image:hover {
    transform: scale(1.02);
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  }

  th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
  }

  th {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: white;
    font-weight: 500;
  }

  tr:hover {
    background: rgba(29, 136, 229, 0.05);
  }

  pre {
    background: #282c34;
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }

  code {
    font-family: 'Fira Code', monospace;
    color: #abb2bf;
    font-size: 0.9rem;
  }

  .code-keyword {
    color: #c678dd;
  }

  .code-property {
    color: #e06c75;
  }

  .code-value {
    color: #98c379;
  }

  .code-selector {
    color: #e5c07b;
  }

  .footer {
    background: linear-gradient(135deg, var(--dark), var(--primary));
    color: white;
    padding: 50px 0;
    margin-top: 80px;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
  }

  .footer-col h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
  }

  .footer-col h3:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background: var(--accent);
  }

  .footer-col ul {
    list-style: none;
  }

  .footer-col li {
    margin-bottom: 10px;
  }

  .footer-col a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
  }

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

  .copyright {
    text-align: center;
    margin-top: 50px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
  }

  @media (max-width: 768px) {
    .content-grid {
      grid-template-columns: 1fr;
    }
    
    .nav {
      display: none;
    }
    
    .hero h1 {
      font-size: 2.2rem;
    }
  }