:root {
    --primary-color: #1E274A;
    --secondary-color: #6C5DD9;
    --accent-color: #FF6B6B;
    --gradient-bg: linear-gradient(135deg, #1E274A, #6C5DD9);
    --text-light: #FFFFFF;
    --text-muted: #CCCCCC;
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Roboto', sans-serif;
  }

  @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&family=Roboto:wght@300;400;500&display=swap');

  body {
    background: var(--gradient-bg);
    color: var(--text-light);
    font-family: var(--font-body);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
  }

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

  .header {
    position: relative;
    height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
  }

  .header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(30, 39, 74, 0.7);
    z-index: 1;
  }

  .header-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 40px;
  }

  .header h1 {
    font-family: var(--font-heading);
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  .header p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: var(--text-muted);
  }

  .notice {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 8px;
    margin: 30px 0;
    border-left: 4px solid var(--accent-color);
  }

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

  .nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(30, 39, 74, 0.9);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
  }

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

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

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

  .nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s ease;
    position: relative;
  }

  .nav-link:hover {
    color: var(--secondary-color);
  }

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

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

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

  .section-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    margin-bottom: 40px;
    text-align: center;
    position: relative;
  }

  .section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--secondary-color);
  }

  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
  }

  .card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
  }

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

  .card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--secondary-color);
  }

  .card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
  }

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

  .card-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--text-light);
  }

  .card-text {
    color: var(--text-muted);
    margin-bottom: 20px;
  }

  .btn {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--text-light);
    padding: 12px 25px;
    border-radius: 30px;
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(108, 93, 217, 0.3);
  }

  .btn:hover {
    background: #5946D4;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(108, 93, 217, 0.4);
  }

  .btn:active {
    transform: translateY(0);
  }

  .article {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 40px;
    margin: 60px 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  }

  .article h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--text-light);
    margin-bottom: 25px;
    position: relative;
  }

  .article h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--secondary-color);
  }

  .article h3 {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    color: var(--text-light);
    margin: 30px 0 20px;
  }

  .article p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-muted);
    margin-bottom: 20px;
  }

  .article pre {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    margin: 25px 0;
    border-left: 4px solid var(--secondary-color);
  }

  .article code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: #F8F8F2;
  }

  .article table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    background: rgba(255, 255, 255, 0.05);
  }

  .article table th,
  .article table td {
    padding: 15px;
    text-align: left;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .article table th {
    background: rgba(30, 39, 74, 0.7);
    font-family: var(--font-heading);
  }

  .article table tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
  }

  .footer {
    background: rgba(30, 39, 74, 0.9);
    padding: 50px 0 20px;
    text-align: center;
  }

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

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

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

  .footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
  }

  .network-node {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--secondary-color);
    border-radius: 50%;
    opacity: 0.7;
    animation: float 15s infinite linear;
    z-index: -1;
  }

  @keyframes float {
    0% {
      transform: translate(0, 0);
    }
    25% {
      transform: translate(50px, 30px);
    }
    50% {
      transform: translate(100px, 0);
    }
    75% {
      transform: translate(50px, -30px);
    }
    100% {
      transform: translate(0, 0);
    }
  }

  @media (max-width: 768px) {
    .header h1 {
      font-size: 2.2rem;
    }

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

    .nav-menu {
      gap: 15px;
    }

    .section {
      padding: 50px 0;
    }

    .section-title {
      font-size: 1.8rem;
    }

    .article {
      padding: 25px;
    }

    .article h2 {
      font-size: 1.6rem;
    }

    .article h3 {
      font-size: 1.3rem;
    }
  }

  @media (max-width: 480px) {
    .header {
      height: 500px;
    }

    .header h1 {
      font-size: 1.8rem;
    }

    .nav-container {
      flex-direction: column;
      gap: 15px;
    }

    .nav-menu {
      flex-wrap: wrap;
      justify-content: center;
    }

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

    .article pre {
      padding: 15px;
      font-size: 0.8rem;
    }
  }