* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

        :root {
            --primary: #6c63ff;
            --primary-dark: #554fd8;
            --secondary: #00d9ff;
            --dark: #121826;
            --darker: #0a0e17;
            --light: #f0f4ff;
            --gray: #a0a7c2;
            --success: #2ed573;
            --error: #ff4757;
            --card-bg: rgba(255, 255, 255, 0.05);
            --border-radius: 20px;
            --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1);
        }

        body {
            background-color: var(--darker);
            color: var(--light);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            background-image: 
                radial-gradient(circle at 10% 20%, rgba(108, 99, 255, 0.1) 0%, transparent 20%),
                radial-gradient(circle at 90% 80%, rgba(0, 217, 255, 0.1) 0%, transparent 20%);
            position: relative;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="none"/><path d="M0,50 Q25,40 50,50 T100,50" stroke="rgba(108, 99, 255, 0.03)" fill="none" stroke-width="1"/><path d="M0,30 Q25,20 50,30 T100,30" stroke="rgba(0, 217, 255, 0.03)" fill="none" stroke-width="1"/></svg>');
            z-index: -1;
            opacity: 0.5;
        }

        .container {
            width: 100%;
            max-width: 450px;
            position: relative;
        }

        .auth-card {
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            padding: 40px 35px;
            box-shadow: 
                0 20px 40px rgba(0, 0, 0, 0.3),
                0 0 0 1px rgba(255, 255, 255, 0.05),
                inset 0 0 0 1px rgba(255, 255, 255, 0.05);
            position: relative;
            overflow: hidden;
            z-index: 1;
        }

        .auth-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            z-index: 2;
        }

        .logo {
            text-align: center;
            margin-bottom: 35px;
        }

        .logo h1 {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .logo i {
            font-size: 2rem;
        }

        .logo p {
            color: var(--gray);
            font-size: 0.95rem;
            margin-top: 8px;
            letter-spacing: 1px;
        }

        .form-container {
            position: relative;
            width: 100%;
            height: 550px;
            overflow: hidden;
        }

        .auth-form {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            padding: 10px 0;
            transition: var(--transition);
            opacity: 0;
            transform: translateX(50px);
            pointer-events: none;
        }

        .auth-form.active {
            opacity: 1;
            transform: translateX(0);
            pointer-events: all;
        }

        .form-title {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .form-title i {
            color: var(--secondary);
        }

        .input-group {
            position: relative;
            margin-bottom: 25px;
        }

        .input-group i {
            position: absolute;
            left: 18px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray);
            font-size: 1.1rem;
            transition: var(--transition);
            z-index: 1;
        }

        .input-group input {
            width: 100%;
            padding: 18px 20px 18px 50px;
            background: rgba(255, 255, 255, 0.07);
            border: 2px solid transparent;
            border-radius: 12px;
            color: var(--light);
            font-size: 1rem;
            transition: var(--transition);
        }

        .input-group input:focus {
            outline: none;
            border-color: var(--primary);
            background: rgba(255, 255, 255, 0.1);
            box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.2);
        }

        .input-group input:focus + i {
            color: var(--primary);
        }

        .input-group input::placeholder {
            color: var(--gray);
        }

        .password-toggle {
            position: absolute;
            right: 18px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray);
            cursor: pointer;
            font-size: 1.1rem;
            transition: var(--transition);
        }

        .password-toggle:hover {
            color: var(--secondary);
        }

        .remember-forgot {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            font-size: 0.9rem;
        }

        .remember {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--gray);
        }

        .remember input {
            appearance: none;
            width: 18px;
            height: 18px;
            background: rgba(255, 255, 255, 0.07);
            border-radius: 4px;
            position: relative;
            cursor: pointer;
        }

        .remember input:checked {
            background: var(--primary);
        }

        .remember input:checked::after {
            content: '✓';
            position: absolute;
            color: white;
            font-size: 0.8rem;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .forgot-link {
            color: var(--secondary);
            text-decoration: none;
            transition: var(--transition);
        }

        .forgot-link:hover {
            color: var(--primary);
            text-decoration: underline;
        }

        .submit-btn {
            width: 100%;
            padding: 18px;
            background: linear-gradient(90deg, var(--primary), var(--primary-dark));
            border: none;
            border-radius: 12px;
            color: white;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            margin-top: 10px;
            letter-spacing: 0.5px;
        }

        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(108, 99, 255, 0.3);
        }

        .form-footer {
            text-align: center;
            margin-top: 25px;
            color: var(--gray);
            font-size: 0.95rem;
        }

        .switch-form {
            color: var(--secondary);
            text-decoration: none;
            font-weight: 600;
            margin-left: 5px;
            transition: var(--transition);
        }

        .switch-form:hover {
            color: var(--primary);
            text-decoration: underline;
        }

        .divider {
            display: flex;
            align-items: center;
            margin: 25px 0;
            color: var(--gray);
        }

        .divider::before, .divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: rgba(255, 255, 255, 0.1);
        }

        .divider span {
            padding: 0 15px;
            font-size: 0.9rem;
        }

        .social-login {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 25px;
        }

        .social-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.07);
            color: var(--light);
            font-size: 1.2rem;
            text-decoration: none;
            transition: var(--transition);
        }

        .social-btn:hover {
            transform: translateY(-5px);
            background: rgba(255, 255, 255, 0.12);
            color: var(--secondary);
        }

        .terms {
            font-size: 0.8rem;
            color: var(--gray);
            text-align: center;
            margin-top: 20px;
            line-height: 1.5;
        }

        .terms a {
            color: var(--secondary);
            text-decoration: none;
        }

        .terms a:hover {
            text-decoration: underline;
        }

        /* Toggle Mechanism */
        #toggle-login:target ~ .form-container .login-form,
        #toggle-register:target ~ .form-container .register-form {
            opacity: 1;
            transform: translateX(0);
            pointer-events: all;
        }

        #toggle-login:target ~ .form-container .register-form,
        #toggle-register:target ~ .form-container .login-form {
            opacity: 0;
            transform: translateX(-50px);
            pointer-events: none;
        }

        /* Hide the target anchors */
        #toggle-login, #toggle-register {
            display: none;
        }

        /* Responsive Design */
        @media (max-width: 480px) {
            .auth-card {
                padding: 30px 25px;
            }
            
            .logo h1 {
                font-size: 1.9rem;
            }
            
            .form-title {
                font-size: 1.6rem;
            }
            
            .social-login {
                gap: 15px;
            }
            
            .social-btn {
                width: 45px;
                height: 45px;
            }
        }

        /* Animation for futuristic elements */
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }

        .floating-element {
            position: absolute;
            width: 80px;
            height: 80px;
            background: linear-gradient(45deg, var(--primary), transparent);
            border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
            opacity: 0.1;
            z-index: -1;
            animation: float 8s ease-in-out infinite;
        }

        .floating-element:nth-child(1) {
            top: 10%;
            left: 5%;
            width: 100px;
            height: 100px;
            animation-delay: 0s;
        }

        .floating-element:nth-child(2) {
            top: 70%;
            right: 10%;
            width: 60px;
            height: 60px;
            background: linear-gradient(45deg, var(--secondary), transparent);
            animation-delay: 2s;
            animation-duration: 10s;
        }

        .floating-element:nth-child(3) {
            bottom: 20%;
            left: 10%;
            width: 70px;
            height: 70px;
            animation-delay: 4s;
            animation-duration: 12s;
        }