@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700&family=Roboto:wght@400;500&display=swap');
  
  :root {
    --primary-dark: #1e3c72;
    --primary: #2a5298;
    --primary-light: #3a7bd5;
    --secondary: #6e48aa;
    --accent: #ff9800;
    --text-light: #f0f0f0;
    --text-dark: #333333;
    --bg-light: #f8f9fa;
    --gray: #e0e0e0;
    --success: #4caf50;
    --danger: #f44336;
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    padding-top: 80px;
  }

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

  /* Header & Navigation */
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(30, 60, 114, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    padding: 15px 0;
  }

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

  .logo {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.5rem;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
  }

  .logo span {
    color: var(--accent);
  }

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

  .nav-item {
    position: relative;
    margin-left: 25px;
  }

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

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

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

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

  /* Hero Section */
  .hero {
    padding: 80px 0;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 70% 30%, rgba(106, 90, 205, 0.2) 0%, transparent 50%);
    z-index: -1;
  }

  .hero h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  .hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    color: rgba(255, 255, 255, 0.9);
  }

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

  /* Article Content */
  .article-container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 40px;
    margin-bottom: 60px;
  }

  article h2 {
    font-family: 'Montserrat', sans-serif;
    font-size: 2rem;
    color: var(--primary);
    margin: 30px 0 20px;
    position: relative;
    padding-bottom: 10px;
  }

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

  article h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    color: var(--secondary);
    margin: 25px 0 15px;
  }

  article h4 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.2rem;
    color: var(--primary-light);
    margin: 20px 0 10px;
  }

  article p {
    margin-bottom: 15px;
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-dark);
  }

  article strong {
    color: var(--primary);
  }

  /* Code Blocks */
  pre {
    background: #282c34;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
  }

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

  /* Images */
  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .image-card {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s;
  }

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

  /* Table */
  table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    overflow: hidden;
  }

  thead {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: white;
  }

  th, td {
    padding: 15px;
    text-align: left;
  }

  tbody tr {
    border-bottom: 1px solid var(--gray);
    transition: background 0.2s;
  }

  tbody tr:last-child {
    border-bottom: none;
  }

  tbody tr:hover {
    background: rgba(58, 123, 213, 0.05);
  }

  .positive {
    color: var(--success);
    font-weight: 500;
  }

  .negative {
    color: var(--danger);
    font-weight: 500;
  }

  /* Footer */
  .footer {
    background: rgba(30, 60, 114, 0.9);
    color: white;
    padding: 40px 0;
    text-align: center;
  }

  .footer p {
    margin-bottom: 10px;
    color: rgba(255, 255, 255, 0.7);
  }

  /* Responsive */
  @media (max-width: 768px) {
    .nav-menu {
      display: none;
    }
    
    .hero h1 {
      font-size: 2.2rem;
    }
    
    .article-container {
      padding: 25px;
    }
    
    article h2 {
      font-size: 1.8rem;
    }
    
    article h3 {
      font-size: 1.3rem;
    }
  }

  /* Animations */
  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
  }

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

  @keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
  }

  .pulse {
    animation: pulse 2s ease-in-out infinite;
  }