:root {
            --primary-color: #6a11cb;
            --secondary-color: #2575fc;
            --background-color: #f3f4f6;
            --text-color: #1f2937;
            --error-color: #ef4444;
            --success-color: #10b981;
        }

        body {
            font-family: 'Poppins', sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: var(--text-color);
            padding: 20px;
        }

        .container {
            background-color: rgba(255, 255, 255, 0.95);
            padding: 3rem;
            border-radius: 20px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            max-width: 450px;
            width: 100%;
            backdrop-filter: blur(10px);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .container:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }

        h1, h2 {
            text-align: center;
            color: var(--primary-color);
            font-weight: 700;
            letter-spacing: -1px;
        }

        h1 {
            margin-bottom: 2rem;
            font-size: 2.5rem;
        }

        h2 {
            margin-bottom: 1rem;
            font-size: 1.8rem;
        }

        .license-key-input, .domain-input {
            display: flex;
            gap: 0.75rem;
            margin-bottom: 2rem;
        }

        input {
            width: 100%;
            height: 4rem;
            font-size: 1.5rem;
            text-align: center;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            transition: all 0.3s ease;
            font-weight: 600;
            color: var(--text-color);
        }

        input:focus {
            outline: none;
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 3px rgba(37, 117, 252, 0.2);
        }

        button {
            width: 100%;
            padding: 1rem;
            font-size: 1.1rem;
            color: white;
            border: none;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 1rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        button i {
            margin-right: 0.5rem;
        }

        .activate-btn, .add-domain-btn {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        }

        .activate-btn:hover, .add-domain-btn:hover {
            opacity: 0.9;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(37, 117, 252, 0.2);
        }

        .buy-btn {
            background-color: var(--success-color);
        }

        .buy-btn:hover {
            opacity: 0.9;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
        }

        .message {
            text-align: center;
            margin-top: 1rem;
            font-size: 1rem;
            font-weight: 500;
            opacity: 0;
            transition: opacity 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .message i {
            margin-right: 0.5rem;
        }

        .error-message {
            color: var(--error-color);
        }

        .success-message {
            color: var(--success-color);
        }

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

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

        .hidden {
            display: none;
        }

        @media (max-width: 480px) {
            .container {
                padding: 2rem;
            }

            input {
                height: 3.5rem;
                font-size: 1.25rem;
            }

            h1 {
                font-size: 2rem;
            }

            h2 {
                font-size: 1.5rem;
            }
        }