* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Poppins', sans-serif;
            line-height: 1.6;
            background: url('.jpg') no-repeat center center/cover;
            color: #333;
            margin: 0;
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        body.dark-mode {
            background: #333;
            color: #fff;
        }

        header {
            background: linear-gradient(to right, #a1c4fd, #c2e9fb);
            padding: 20px;
            text-align: center;
            position: relative;
        }

        header.dark-mode {
            background: linear-gradient(to right, #444, #666);
        }

        header h1 {
            color: #fff;
            font-size: 2.5em;
            margin-bottom: 10px;
        }

        header.dark-mode h1 {
            color: #eee;
        }

        header p {
            color: #fff;
            font-size: 1.2em;
        }

        header.dark-mode p {
            color: #bbb;
        }

        .login-btn {
            position: absolute;
            top: 20px;
            right: 20px;
            padding: 10px 15px;
            background-color: #007BFF;
            color: white;
            font-size: 1em;
            font-weight: 600;
            text-decoration: none;
            border-radius: 5px;
            transition: background-color 0.3s;
        }

        .login-btn:hover {
            background-color: #0056b3;
        }

        nav {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            background: #fff;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        nav.dark-mode {
            background: #444;
        }

        nav a {
            padding: 15px 20px;
            text-decoration: none;
            color: #333;
            font-weight: 600;
            transition: color 0.3s;
            text-align: center;
        }

        nav.dark-mode a {
            color: #eee;
        }

        nav a:hover {
            color: #007BFF;
        }

        nav.dark-mode a:hover {
            color: #80c2ff;
        }

        .hero {
            text-align: center;
            padding: 50px 20px;
            background: linear-gradient(to right, #c2e9fb, #a1c4fd);
            color: white;
        }

        .hero.dark-mode {
            background: linear-gradient(to right, #444, #666);
        }

        .hero h2 {
            font-size: 2.2em;
            margin-bottom: 20px;
        }

        .hero.dark-mode h2 {
            color: #ddd;
        }

        .hero p {
            font-size: 1.2em;
            margin-bottom: 20px;
        }

        .hero.dark-mode p {
            color: #bbb;
        }

        .hero button {
            padding: 10px 20px;
            font-size: 1em;
            border: none;
            border-radius: 5px;
            background-color: #007BFF;
            color: white;
            cursor: pointer;
            transition: background-color 0.3s;
            margin: 10px;
        }

        .hero.dark-mode button {
            background-color: #444;
        }

        .hero button:hover {
            background-color: #0056b3;
        }

        .hero.dark-mode button:hover {
            background-color: #666;
        }

        .features {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
            padding: 50px 20px;
        }

        .features .feature {
            text-align: center;
            max-width: 300px;
            flex: 1 1 250px;
            margin: 10px;
        }

        footer {
            text-align: center;
            background: #333;
            color: #fff;
            padding: 20px;
            margin-top: 20px;
            font-size: 0.9em;
        }

        footer a {
            color: #007BFF;
            text-decoration: none;
        }

        footer a:hover {
            text-decoration: underline;
        }

        /* Dark mode for footer */
        footer.dark-mode {
            background: #444;
        }

        footer.dark-mode a {
            color: #80c2ff;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            header h1 {
                font-size: 2em;
            }

            .login-btn {
                top: 10px;
                right: 10px;
                font-size: 0.9em;
                padding: 8px 12px;
            }

            .hero h2 {
                font-size: 1.8em;
            }

            .hero p {
                font-size: 1em;
            }

            nav a {
                padding: 10px;
            }

            .features {
                flex-direction: column;
                align-items: center;
            }

            .features .feature {
                flex: 1 1 100%;
            }
        }

        @media (max-width: 480px) {
            header p {
                font-size: 1em;
            }

            .hero h2 {
                font-size: 1.5em;
            }

            .hero button {
                font-size: 0.9em;
                padding: 8px 15px;
            }

            footer {
                font-size: 0.8em;
            }
        }