* { box-sizing: border-box; margin: 0; padding: 0; }
        body { 
            font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif; 
            background-color: #f4f7f6; 
            color: #333; 
        }
        
        .container {
            max-width: 500px;
        }
        .card {
            margin-top: 50px;
            border: none;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        .card-header {
            background-color: black;
            color: #20C997;
            font-weight: bold;
        }
        .results-textarea {
            height: 100px;
            width: 100%;
            font-family: monospace;
        }
        .copy-button {
            float: right;
        }

   
        .header { 
            background-color: black; 
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15); 
            padding: 18px 40px; 
            display: flex; 
            justify-content: space-between; 
            align-items: center; 
            position: sticky; 
            top: 0; 
            z-index: 1000; 
            height: 75px; 
        }
        .header .logo { font-size: 26px; font-weight: 700; color: #20C997; text-decoration: none; letter-spacing: 1px; }
        .header .navigation a { margin-left: 25px; text-decoration: none; color: #20C997; font-weight: 500; font-size: 16px; position: relative; padding-bottom: 5px; transition: color 0.3s ease; }
        .header .navigation a:hover { color: #ffffff; }
        .header .navigation a::after { content: ''; position: absolute; width: 100%; transform: scaleX(0); height: 2px; bottom: 0; left: 0; background-color: #ffffff; transform-origin: bottom right; transition: transform 0.3s ease-out; }
        .header .navigation a:hover::after { transform: scaleX(1); transform-origin: bottom left; }
        .hamburger-menu { display: none; font-size: 30px; background: none; border: none; cursor: pointer; color: #20C997; }
        
        
        .main-layout {
            display: flex;
            position: relative;
            padding-top: 75px; 
            margin-top: -75px; 
        }

        .sidebar {
            width: 250px;
            background-color: black;
            color: white;
            padding: 20px;
            overflow-y: auto; 
            flex-shrink: 0; 
            height: 100vh; 
            position: fixed; 
            top: 0;
            left: 0;
            padding-top: 95px; 
            z-index: 990; 
            transition: transform 0.3s ease-in-out;
        }

        .content {
            flex-grow: 1; 
            padding: 40px;
            margin-left: 250px; 
            width: calc(100% - 250px);
            min-height: calc(100vh - 75px);
        }

        .sidebar::-webkit-scrollbar { width: 8px; }
        .sidebar::-webkit-scrollbar-track { background: #212529; }
        .sidebar::-webkit-scrollbar-thumb { background-color: #495057; border-radius: 10px; border: 2px solid #212529; }
        .sidebar::-webkit-scrollbar-thumb:hover { background-color: #6c757d; }
        .sidebar .close-btn { display: none; }
        .sidebar ul { list-style: none; }
        .sidebar ul li a { display: block; padding: 12px 15px; color: #20C997; text-decoration: none; border-radius: 5px; transition: background-color 0.3s, color 0.3s; }
        .sidebar ul li a:hover { background-color: #495057; color: #ffffff; }
        .dropdown .dropdown-toggle::after { content: '▼'; float: right; font-size: 12px; transition: transform 0.3s; }
        .dropdown .dropdown-toggle.active::after { transform: rotate(180deg); }
        .dropdown-menu { display: none; list-style: none; padding-left: 20px; }
        .dropdown-menu.show { display: block; }

        .content-card { background-color: black; padding: 40px; border-radius: 10px; box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05); }
        h1 { color: #007BFF; }
        p { font-size: 18px; line-height: 1.6; margin: 15px 0; }
        
        .footer { 
            background-color: black; 
            color: white; 
            padding: 40px 20px;
            margin-left: 250px; 
        }
        .footer-container { max-width: 1100px; margin: 0 auto; text-align: center; }
        .social-links a { display: inline-block; margin: 0 15px; color: #20C997; transition: color 0.3s ease, transform 0.3s ease; }
        .social-links a:hover { color: #ffffff; transform: translateY(-3px); }
        .social-links svg { width: 28px; height: 28px; fill: currentColor; }
        .footer-credit { font-size: 14px; color: #adb5bd; }
        .footer-credit a { color: #20C997; text-decoration: none; font-weight: bold; }

        @media (max-width: 768px) {
            .header { padding: 15px 20px; }
            .header .navigation { display: none; }
            .hamburger-menu { display: block; }
            
            .sidebar { 
                z-index: 1001; 
                transform: translateX(-100%); 
                padding-top: 20px; 
            }
            .sidebar.show { 
                transform: translateX(0);
            }
            .sidebar .close-btn { 
                display: block; 
                position: absolute; 
                top: 15px; 
                right: 25px; 
                font-size: 30px; 
                background: none; 
                border: none; 
                color: #20C997; 
                cursor: pointer;
            }
            
            .content {
                margin-left: 0; 
                width: 100%; 
                padding: 20px;
            }

            .footer {
                margin-left: 0; 
            }
        }