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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            position: relative;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            animation: shimmer 3s ease-in-out infinite alternate;
            z-index: -1;
        }

        @keyframes shimmer {
            0% { opacity: 0.8; }
            100% { opacity: 1; }
        }

        .floating-elements {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 1;
        }

        .floating-element {
            position: absolute;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            animation: float 6s ease-in-out infinite;
        }

        .floating-element:nth-child(1) {
            width: 80px;
            height: 80px;
            top: 10%;
            left: 10%;
            animation-delay: 0s;
        }

        .floating-element:nth-child(2) {
            width: 60px;
            height: 60px;
            top: 70%;
            left: 80%;
            animation-delay: 2s;
        }

        .floating-element:nth-child(3) {
            width: 40px;
            height: 40px;
            top: 30%;
            left: 70%;
            animation-delay: 4s;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px) rotate(0deg); }
            33% { transform: translateY(-30px) rotate(120deg); }
            66% { transform: translateY(15px) rotate(240deg); }
        }

        .registration-container {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 25px;
            padding: 40px;
            width: 100%;
            max-width: 450px;
            box-shadow: 0 25px 45px rgba(0, 0, 0, 0.3);
            position: relative;
            z-index: 10;
            animation: slideIn 0.8s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(50px) scale(0.9);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .registration-container::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4);
            border-radius: 25px;
            z-index: -1;
            animation: borderGlow 3s ease-in-out infinite;
            opacity: 0.5;
        }

        @keyframes borderGlow {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 0.8; }
        }

        .logo {
            text-align: center;
            margin-bottom: 30px;
        }

        .logo h1 {
            color: #fff;
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 10px;
            text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
            animation: pulse 2s ease-in-out infinite;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }

        .logo p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 1rem;
        }

        .form-toggle {
            display: flex;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 15px;
            margin-bottom: 30px;
            overflow: hidden;
            position: relative;
        }

        .toggle-btn {
            flex: 1;
            padding: 15px;
            background: none;
            border: none;
            color: rgba(255, 255, 255, 0.7);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            z-index: 2;
        }

        .toggle-btn.active {
            color: #fff;
        }

        .toggle-slider {
            position: absolute;
            top: 0;
            left: 0;
            width: 50%;
            height: 100%;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 15px;
            transition: transform 0.3s ease;
            z-index: 1;
        }

        .toggle-slider.register {
            transform: translateX(100%);
        }

        .form {
            display: none;
            animation: fadeIn 0.5s ease-in-out;
        }

        .form.active {
            display: block;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateX(20px); }
            to { opacity: 1; transform: translateX(0); }
        }

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

        .form-group input {
            width: 100%;
            padding: 15px 20px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 15px;
            color: #fff;
            font-size: 1rem;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
        }

        .form-group input::placeholder {
            color: rgba(255, 255, 255, 0.6);
        }

        .form-group input:focus {
            outline: none;
            border-color: rgba(255, 255, 255, 0.6);
            background: rgba(255, 255, 255, 0.15);
            box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }

        .form-group i {
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: rgba(255, 255, 255, 0.6);
            font-size: 1.1rem;
        }

        .submit-btn {
            width: 100%;
            padding: 15px;
            background: linear-gradient(45deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 15px;
            color: #fff;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
            background: linear-gradient(45deg, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.2));
        }

        .submit-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.5s;
        }

        .submit-btn:hover::before {
            left: 100%;
        }

        .message {
            margin-bottom: 20px;
            padding: 15px;
            border-radius: 15px;
            text-align: center;
            font-weight: 600;
            animation: slideDown 0.5s ease-out;
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .message.error {
            background: rgba(255, 107, 107, 0.2);
            border: 1px solid rgba(255, 107, 107, 0.5);
            color: #ff6b6b;
        }

        .message.success {
            background: rgba(78, 205, 196, 0.2);
            border: 1px solid rgba(78, 205, 196, 0.5);
            color: #4ecdc4;
        }

        .back-link {
            text-align: center;
            margin-top: 20px;
        }

        .back-link a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .back-link a:hover {
            color: #fff;
            text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
        }

        @media (max-width: 480px) {
            .registration-container {
                padding: 30px 20px;
                margin: 10px;
            }
            
            .logo h1 {
                font-size: 2rem;
            }
        }

        .shake {
            animation: shake 0.5s ease-in-out;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-5px); }
            75% { transform: translateX(5px); }
        }