/* Frutiger Aero inspired styles: glossy buttons, gradients, skeuomorphism */
        body {
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #228B22 0%, #32CD32 100%);
            color: #fff;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        header {
            background: linear-gradient(to bottom, rgba(0, 128, 0, 0.8), rgba(34, 139, 34, 0.8));
            border-bottom: 2px solid #fff;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }

        .logo {
            font-size: 2.5em;
            font-weight: bold;
            background: linear-gradient(45deg, #90EE90, #00FF00);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-align: center;
            padding: 10px 0;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }

        nav {
            display: flex;
            justify-content: center;
            gap: 10px;
            padding: 10px;
            background: rgba(255, 255, 255, 0.1);
        }

        .nav-btn {
            padding: 10px 20px;
            border: none;
            border-radius: 20px;
            font-size: 1em;
            font-weight: bold;
            cursor: pointer;
            box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
            transition: all 0.3s ease;
            text-decoration: none;
            color: #fff;
            display: inline-block;
        }

        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.5), 0 4px 8px rgba(0, 0, 0, 0.3);
        }

        .home-btn {
            background: linear-gradient(to bottom, #A9A9A9, #808080);
            color: #fff;
        }

        .active-btn, .emulators-btn, .software-btn, .repos-btn {
            background: linear-gradient(to bottom, #32CD32, #228B22);
            color: #fff;
        }

        main {
            flex: 1;
            display: flex;
            padding: 20px;
            gap: 20px;
        }

        .sidebar {
            width: 200px;
            background: rgba(255, 255, 255, 0.1);
            border: 2px solid #fff;
            border-radius: 10px;
            padding: 10px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }

        .sidebar-btn {
            display: block;
            width: 100%;
            margin-bottom: 10px;
            padding: 10px;
            background: linear-gradient(to bottom, #32CD32, #228B22);
            border: none;
            border-radius: 10px;
            color: #fff;
            font-weight: bold;
            cursor: pointer;
            box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
            transition: all 0.3s ease;
            text-align: left;
        }

        .sidebar-btn:hover {
            transform: translateX(5px);
            box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.5), 0 4px 8px rgba(0, 0, 0, 0.3);
        }

        .content {
            flex: 1;
            background: rgba(255, 255, 255, 0.1);
            border: 2px solid #fff;
            border-radius: 10px;
            padding: 20px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }

        h1, h2 {
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
        }

        ul {
            list-style: none;
            padding: 0;
        }

        ul li {
            margin-bottom: 10px;
        }

        a {
            color: #fff;
            text-decoration: underline;
            transition: color 0.3s;
        }

        a:hover {
            color: #90EE90;
        }

        footer {
            background: rgba(0, 0, 0, 0.2);
            text-align: center;
            padding: 10px;
            border-top: 2px solid #fff;
            font-size: 0.9em;
        }