:root {
    --primary: #1A237E;
    --secondary: #E0E0E0;
    --accent: #FFC107;
    --bg-gradient-start: #E3F2FD;
    --bg-gradient-end: #BBDEFB;
    --text-dark: #212121;
    --text-light: #FAFAFA;
    --card-shadow: 0 10px 20px rgba(0,0,0,0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

  body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px 40px;
  }

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

  .header h1 {
    font-size: 2.8rem;
    background: linear-gradient(to right, var(--primary), #3F51B5);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
  }

  .header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-dark);
  }

  .notice {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--accent);
    color: var(--primary);
    text-align: center;
    padding: 10px;
    font-weight: bold;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  }

  .split-layout {
    display: flex;
    gap: 30px;
    margin-bottom: 60px;
  }

  .panel {
    flex: 1;
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
  }

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

  .panel h2 {
    color: var(--primary);
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
  }

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

  .panel img {
    width: 100%;
    border-radius: 8px;
    margin: 20px 0;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: var(--transition);
  }

  .panel img:hover {
    transform: scale(1.02);
  }

  .code-container {
    background: #2d2d2d;
    border-radius: 8px;
    padding: 20px;
    margin: 25px 0;
    overflow: hidden;
  }

  pre {
    color: #f8f8f2;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
  }

  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
  }

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

  .card h3 {
    color: var(--primary);
    margin-bottom: 15px;
  }

  .card img {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 15px;
  }

  .nav-tabs {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 1px solid #e0e0e0;
  }

  .nav-tabs a {
    padding: 12px 20px;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 600;
    position: relative;
    transition: var(--transition);
  }

  .nav-tabs a:hover {
    color: var(--primary);
  }

  .nav-tabs a.active {
    color: var(--primary);
  }

  .nav-tabs a.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent);
  }

  .footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 60px;
    border-top: 1px solid rgba(0,0,0,0.1);
  }

  @media (max-width: 768px) {
    .split-layout {
      flex-direction: column;
    }
    
    .header h1 {
      font-size: 2rem;
    }
    
    .card-grid {
      grid-template-columns: 1fr;
    }
  }

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

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