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

      body {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        line-height: 1.6;
        color: #333;
        background: #f5f7fa;
      }

      header {
        background: linear-gradient(135deg, #4a90e2 0%, #357abd 100%);
        color: white;
        padding: 3rem 0;
        text-align: center;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
      }

      .header-content h1 {
        font-size: 2.5rem;
        margin-bottom: 0.5rem;
        font-weight: 700;
      }

      .tagline {
        font-size: 1.2rem;
        opacity: 0.95;
      }

      nav {
        background: white;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        position: sticky;
        top: 0;
        z-index: 100;
      }

      .nav-content {
        max-width: 1200px;
        margin: 0 auto;
        display: flex;
        padding: 0 2rem;
      }

      nav a {
        padding: 1rem 1.5rem;
        text-decoration: none;
        color: #2c3e50;
        transition: all 0.3s ease;
        border-bottom: 3px solid transparent;
        font-weight: 500;
      }

      nav a:hover, nav a.active {
        color: #4a90e2;
        border-bottom-color: #4a90e2;
      }

      .container {
        max-width: 1200px;
        margin: 2rem auto;
        padding: 0 2rem;
        display: grid;
        grid-template-columns: 250px 1fr;
        gap: 2rem;
      }

      .sidebar {
        background: white;
        padding: 1.5rem;
        border-radius: 8px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        height: fit-content;
        position: sticky;
        top: 80px;
      }

      .sidebar h3 {
        color: #2c3e50;
        margin-bottom: 1rem;
        font-size: 1.1rem;
      }

      .sidebar ul {
        list-style: none;
      }

      .sidebar li {
        margin-bottom: 0.5rem;
      }

      .sidebar a {
        color: #5a6c7d;
        text-decoration: none;
        display: block;
        padding: 0.5rem;
        border-radius: 4px;
        transition: all 0.3s ease;
      }

      .sidebar a:hover {
        background: #f0f4f8;
        color: #4a90e2;
        padding-left: 1rem;
      }

      .content {
        background: white;
        padding: 2rem;
        border-radius: 8px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.05);
      }

      section {
        margin-bottom: 3rem;
        scroll-margin-top: 100px;
      }

      h2 {
        color: #2c3e50;
        margin-bottom: 1rem;
        padding-bottom: 0.5rem;
        border-bottom: 2px solid #4a90e2;
        font-size: 1.8rem;
      }

      h3 {
        color: #34495e;
        margin: 1.5rem 0 1rem;
        font-size: 1.3rem;
      }

      h4 {
        color: #2c3e50;
        margin: 1rem 0 0.5rem;
        font-size: 1.1rem;
      }

      p {
        margin-bottom: 1rem;
        color: #5a6c7d;
      }

      ul, ol {
        margin-left: 2rem;
        margin-bottom: 1rem;
      }

      li {
        margin-bottom: 0.5rem;
        color: #5a6c7d;
      }

      .feature-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 1.5rem;
        margin-top: 1.5rem;
      }

      .feature-card {
        background: #f8f9fa;
        padding: 1.5rem;
        border-radius: 8px;
        border-left: 4px solid #4a90e2;
        transition: transform 0.3s ease;
      }

      .feature-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
      }

      .feature-card h4 {
        margin-top: 0;
        color: #4a90e2;
      }

      .code-block {
        background: #2c3e50;
        color: #ecf0f1;
        padding: 1.5rem;
        border-radius: 8px;
        overflow-x: auto;
        margin: 1rem 0;
        font-family: 'Courier New', monospace;
        font-size: 0.95rem;
        line-height: 1.5;
      }

      .btn {
        display: inline-block;
        background: #4a90e2;
        color: white;
        padding: 0.8rem 2rem;
        border-radius: 6px;
        text-decoration: none;
        font-weight: 600;
        transition: all 0.3s ease;
        margin-top: 1rem;
      }

      .btn:hover {
        background: #357abd;
        transform: translateY(-2px);
        box-shadow: 0 5px 15px rgba(74, 144, 226, 0.3);
      }

      .info-box {
        background: #e8f4fd;
        border-left: 4px solid #4a90e2;
        padding: 1rem 1.5rem;
        margin: 1rem 0;
        border-radius: 4px;
      }

      .warning-box {
        background: #fff3cd;
        border-left: 4px solid #ffc107;
        padding: 1rem 1.5rem;
        margin: 1rem 0;
        border-radius: 4px;
      }

      .success-box {
        background: #d4edda;
        border-left: 4px solid #28a745;
        padding: 1rem 1.5rem;
        margin: 1rem 0;
        border-radius: 4px;
      }

      table {
        width: 100%;
        border-collapse: collapse;
        margin: 1rem 0;
      }

      th, td {
        padding: 0.75rem;
        text-align: left;
        border-bottom: 1px solid #e0e0e0;
      }

      th {
        background: #f8f9fa;
        color: #2c3e50;
        font-weight: 600;
      }

      footer {
        background: #2c3e50;
        color: white;
        text-align: center;
        padding: 2rem;
        margin-top: 3rem;
      }

      footer a {
        color: #4a90e2;
        text-decoration: none;
      }

      footer a:hover {
        text-decoration: underline;
      }

      .screenshot {
        width: 100%;
        max-width: 800px;
        border-radius: 8px;
        box-shadow: 0 5px 20px rgba(0,0,0,0.1);
        margin: 1.5rem 0;
      }

      .keyboard-shortcut {
        background: #f8f9fa;
        padding: 0.25rem 0.5rem;
        border-radius: 4px;
        border: 1px solid #dee2e6;
        font-family: monospace;
        font-size: 0.9rem;
      }

      @media (max-width: 768px) {
        .container {
          grid-template-columns: 1fr;
        }

        .sidebar {
          position: static;
        }

        .header-content h1 {
          font-size: 2rem;
        }

        .nav-content {
          flex-direction: column;
          padding: 0;
        }

        nav a {
          border-bottom: 1px solid #e0e0e0;
        }
      }