body {
      background-color: #121212;
      color: #eee;
      font-family: 'Segoe UI', sans-serif;
    }
    .sidebar {
      background-color: #1e1e1e;
      min-height: 100vh;
      padding: 1rem;
    }
    .sidebar .nav-link {
      color: #a0a0a0;
      margin-bottom: 1rem;
    }
    .sidebar .nav-link:hover {
      color: #0dcaf0;
    }
    .topbar {
      background-color: #1f1f1f;
      padding: 1rem 2rem;
      border-bottom: 1px solid #2a2a2a;
    }
    footer {
      background-color: #1e1e1e;
      color: #999;
      text-align: center;
      font-size: 0.8rem;
      padding: 1rem;
      border-top: 1px solid #2a2a2a;
    }
  </style>
  
  <style>
    .header-bar {
        display: flex;
        justify-content: space-between;
        align-items: center;
        background-color: #1a1a1a;
        padding: 10px 20px;
        color: white;
        border-bottom: 1px solid #333;
        position: sticky;
        top: 0;
        z-index: 50;
        }

    .logo {
        display: flex;
        align-items: center;
        gap: 10px;
        }

    .logo img {
        height: 34px;
        }

    .menu-items {
        display: flex;
        gap: 18px;
        }

    .menu-items a {
        color: #ccc;
        text-decoration: none;
        font-size: 14px;
        transition: color 0.2s;
    }

    .menu-items a:hover {
        color: #00bfff;
        }

    .lang-switch {
        font-size: 13px;
        color: #888;
        cursor: pointer;
        }

    .sidebar .nav-link {
        padding-left: 0.75rem;
        font-size: 0.95rem;
        display: block;
        color: #ccc;
        transition: all 0.2s;
        }

    .sidebar .nav-link:hover {
        color: #0dcaf0;
        font-weight: 500;
        }

    .sidebar .nav-item span.nav-link {
        cursor: default;
        padding-left: 1.5rem;
        color: #999;
        } 
        
    .main-menu {
        width: 200px;
        background-color: #1a1a1a;
        padding: 20px;
        min-height: 100vh;
        }

    .menu-link {
        display: block;
        margin: 6px 0;
        color: #66ccff;
        text-decoration: none;
        font-size: 14px;
        }

    .menu-link:hover {
        color: #88ddff;
        }

    .quick-links {
        margin-top: 30px;
        border-top: 1px solid #444;
        padding-top: 10px;
        }

    .quick-links h4 {
        font-size: 13px;
        color: #aaa;
        margin-bottom: 10px;
        }