:root {
      --primary: #5865F2;
      --background: #fafafa;
      --text: #1e1e1e;
      --muted: #666;
      --code-bg: #f0f0f0;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'Inter', sans-serif;
      background: var(--background);
      color: var(--text);
      line-height: 1.7;
    }

    header {
      padding: 60px 20px 30px;
      text-align: center;
      background: linear-gradient(135deg, #e4e8ff, #ffffff);
      animation: fadeIn 1s ease-out;
    }

    header h1 {
      font-size: 36px;
      margin-bottom: 10px;
    }

    header p {
      color: var(--muted);
      font-size: 17px;
    }

    .container {
      max-width: 860px;
      margin: 0 auto;
      padding: 40px 20px;
      animation: slideUp 0.8s ease-out;
    }

    @keyframes fadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    @keyframes slideUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    h2 {
      font-size: 24px;
      color: var(--primary);
      margin-top: 40px;
      border-left: 4px solid var(--primary);
      padding-left: 12px;
    }

    pre {
      background: var(--code-bg);
      padding: 16px;
      border-radius: 8px;
      overflow-x: auto;
      font-size: 14px;
    }

    .btn-group {
      margin: 30px 0;
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn {
      background: var(--primary);
      color: white;
      padding: 14px 20px;
      border-radius: 8px;
      text-decoration: none;
      font-weight: 600;
      transition: background 0.3s ease;
    }

    .btn:hover {
      background: #4752d5;
    }

    .footer {
      text-align: center;
      padding: 40px 20px;
      font-size: 13px;
      color: #aaa;
    }

    code {
      color: #222;
    }

    .tag {
      display: inline-block;
      font-size: 12px;
      padding: 4px 8px;
      background: #ddd;
      color: #333;
      border-radius: 4px;
      margin-bottom: 6px;
    }