 * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            display: flex;
            min-height: 100vh;
            background-color: #f5f5f5;
        }

        .main-content {
            flex: 1;
            padding: 2rem;
            transition: margin 0.3s ease;
        }

        .sidebar {
            width: 250px;
            background: linear-gradient(to bottom, #3a4754, #303841);
            color: #fff;
            padding: 20px;
            display: flex;
            flex-direction: column;
            position: fixed;
            top: 0;
            left: 0;
            height: 100%;
            box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
            transform: translateX(0);
            transition: transform 0.3s ease;
            z-index: 1000;
        }

        .sidebar.closed {
            transform: translateX(-100%);
        }

        .toggle-btn {
            position: fixed;
            bottom: 20px;
            left: 250px;
            background: #3a4754;
            color: white;
            border: none;
            border-radius: 0 5px 5px 0;
            padding: 10px;
            cursor: pointer;
            z-index: 1001;
            transition: left 0.3s ease;
        }

        .toggle-btn.closed {
            left: 0px;
        }

        .logo {
            text-align: center;
            margin-bottom: 2rem;
            font-size: 1.5rem;
            font-weight: bold;
            letter-spacing: 1px;
        }

        .nav-links {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .nav-links a {
            color: #fff;
            text-decoration: none;
            padding: 12px 15px;
            border-radius: 5px;
            transition: background 0.3s ease;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .nav-links a:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .nav-links a.active {
            background: rgba(255, 255, 255, 0.2);
        }

        .icon {
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .section {
            background: white;
            border-radius: 8px;
            padding: 2rem;
            margin-bottom: 2rem;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

        h1,
        h2 {
            color: #3a4754;
            margin-bottom: 1rem;
        }

        p {
            line-height: 1.6;
            color: #555;
            margin-bottom: 1rem;
        }

        .footer {
            margin-top: auto;
            text-align: center;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.7);
            padding-top: 1rem;
        }

        @media (max-width: 768px) {
            .sidebar {
                width: 100%;
            }

            .toggle-btn {
                left: 20px;
            }

            .toggle-btn.closed {
                left: 20px;
            }
        }