@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@700;900&display=swap');

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

        body {
            font-family: 'Montserrat', sans-serif;
            background: linear-gradient(135deg, #0056b3, #007bff);
            color: #ffffff;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            text-align: center;
            overflow: hidden;
            padding: 20px;
        }

        /* Container Utama */
        .container {
            max-width: 600px;
            animation: fadeIn 1.5s ease-in-out;
        }

        /* Judul Error "404" */
        .error-title {
            font-size: 10rem; /* Ukuran font besar untuk desktop */
            font-weight: 900;
            line-height: 1;
            letter-spacing: 5px;
            text-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            position: relative;
        }

        /* Efek interaktif dengan JS */
        .error-title span {
            display: inline-block;
            transition: transform 0.3s ease;
        }

        /* Pesan Error */
        .error-message {
            font-size: 1.5rem;
            font-weight: 700;
            margin-top: 20px;
            margin-bottom: 30px;
        }

        .error-description {
            font-size: 1rem;
            font-weight: 400;
            margin-bottom: 40px;
        }

        /* Tombol Kembali */
        .back-button {
            display: inline-block;
            padding: 12px 25px;
            background-color: #ffffff;
            color: #007bff;
            border: none;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 1rem;
            transition: transform 0.3s ease, background-color 0.3s ease;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
        }

        .back-button:hover {
            transform: translateY(-5px);
            background-color: #f0f0f0;
        }

        /* Animasi */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* CSS Responsif */
        @media (max-width: 768px) {
            .error-title {
                font-size: 8rem;
            }
            .error-message {
                font-size: 1.25rem;
            }
        }

        @media (max-width: 480px) {
            .error-title {
                font-size: 5rem;
                letter-spacing: 2px;
            }
            .error-message {
                font-size: 1rem;
            }
            .error-description {
                font-size: 0.9rem;
            }
            .back-button {
                padding: 10px 20px;
                font-size: 0.9rem;
            }
        }