* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Noto Sans Myanmar', Arial, sans-serif;
        }

        body {
            background-color: #f0f4f8;
            color: #333;
            line-height: 1.6;
            padding: 0;
            overflow-x: hidden;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* Header Styles */
        header {
            background: linear-gradient(135deg, #1a73e8 0%, #4a91ff 100%);
            padding: 20px 30px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 3px solid #ffffff33;
            animation: fadeIn 0.5s ease-in;
        }

        .header-container {
            width: 100%;
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .header-title {
            font-size: 2rem;
            color: #fff;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 10px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .header-title::before {
            content: '⌨️';
            font-size: 1.5rem;
        }

        .header-nav {
            display: flex;
            gap: 20px;
        }

        .header-nav a {
            color: #fff;
            text-decoration: none;
            font-size: 1.1rem;
            position: relative;
            padding-bottom: 5px;
            transition: color 0.3s ease;
        }

        .header-nav a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: #fff;
            transition: width 0.3s ease;
        }

        .header-nav a:hover::after {
            width: 100%;
        }

        .header-nav a:hover {
            color: #e8f0fe;
        }

        /* Hamburger Menu Styles */
        .hamburger {
            display: none;
            font-size: 1.8rem;
            color: #fff;
            background: none;
            border: none;
            cursor: pointer;
            padding: 10px;
            z-index: 101;
        }

        .hamburger:focus {
            outline: none;
        }

        .header-nav.active {
            display: flex;
            flex-direction: column;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background: #1a73e8;
            padding: 20px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
            animation: slideDown 0.3s ease-in-out;
        }

        .header-nav.active a {
            padding: 15px;
            font-size: 1.2rem;
            border-bottom: 1px solid #ffffff33;
        }

        .header-nav.active a:last-child {
            border-bottom: none;
        }

        /* Main Content */
        .container {
            width: 100%;
            padding: 20px;
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            flex: 1;
        }

        .column {
            background: #fff;
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .column:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
        }

        .column-1 {
            flex: 1;
            min-width: 250px;
            max-height: 80vh;
            overflow-y: auto;
        }

        .column-2 {
            flex: 2;
            min-width: 300px;
            position: relative;
        }

        .column-3 {
            flex: 1;
            min-width: 200px;
        }

        h2 {
            color: #1a73e8;
            margin-bottom: 15px;
            font-size: 1.5rem;
            animation: fadeIn 0.5s ease-in;
        }

        .lesson-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .lesson {
            background: #e8f0fe;
            padding: 12px;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.3s ease, transform 0.2s ease;
            text-align: center;
            font-size: 1rem;
            animation: slideIn 0.5s ease forwards;
        }

        .lesson:hover {
            background: #d1e0ff;
            transform: scale(1.05);
        }

        .lesson.disabled {
            background: #f5f5f5;
            color: #999;
            cursor: not-allowed;
        }

        .lesson.active {
            background: #1a73e8;
            color: #fff;
            font-weight: bold;
        }

        #lesson-text {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: #444;
            animation: fadeIn 0.5s ease-in;
        }

        #input-area {
            width: 100%;
            min-height: 150px;
            padding: 15px;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            resize: vertical;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
            margin-bottom: 20px;
        }

        #input-area:focus {
            border-color: #1a73e8;
            box-shadow: 0 0 8px rgba(26, 115, 232, 0.3);
            outline: none;
        }

        #input-area:disabled {
            background: #f5f5f5;
            cursor: not-allowed;
        }

        .stats {
            margin-top: 20px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 10px;
        }

        .stats div {
            background: #f8fafc;
            padding: 10px;
            border-radius: 8px;
            text-align: center;
            font-size: 0.9rem;
            animation: fadeInUp 0.5s ease-in;
        }

        .stats span {
            color: #1a73e8;
            font-weight: bold;
            transition: transform 0.3s ease;
        }

        .stats div:hover span {
            transform: scale(1.1);
        }

        .menu__item {
            display: block;
            padding: 12px;
            background: #e8f0fe;
            color: #1a73e8;
            text-decoration: none;
            border-radius: 8px;
            margin-bottom: 10px;
            transition: background 0.3s ease, transform 0.2s ease;
            animation: slideIn 0.5s ease forwards;
        }

        .menu__item:hover {
            background: #d1e0ff;
            transform: scale(1.05);
        }

        /* Smart Keyboard Styling */
        .keyboard {
            background: #ffffff;
            border-radius: 10px;
            padding: 15px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
            margin-top: 20px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(45px, 1fr));
            gap: 8px;
            position: relative;
            animation: fadeInUp 0.5s ease-in;
        }

        .key {
            background: #f8f9fa;
            border: 1px solid #e0e0e0;
            border-radius: 6px;
            padding: 12px;
            text-align: center;
            font-size: 1.1rem;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 45px;
        }

        .key:hover {
            background: #e8f0fe;
            transform: translateY(-2px);
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        }

        .key:active {
            background: #1a73e8;
            color: #fff;
            transform: scale(0.95);
        }

        .key.special {
            background: #e8f0fe;
            font-size: 0.9rem;
            font-weight: bold;
        }

        .key.special:hover {
            background: #d1e0ff;
        }

        .key.special:active {
            background: #1a73e8;
            color: #fff;
        }

        .key.space {
            grid-column: span 4;
            font-size: 0.8rem;
        }

        .keyboard-toggle {
            position: absolute;
            top: -40px;
            right: 10px;
            background: #1a73e8;
            color: #fff;
            padding: 8px 12px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.9rem;
            transition: background 0.3s ease;
        }

        .keyboard-toggle:hover {
            background: #135ab6;
        }

        /* Footer Styles */
        footer {
            background: #fff;
            padding: 20px;
            box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.1);
            margin-top: auto;
            animation: fadeIn 0.5s ease-in;
        }

        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .footer-text {
            font-size: 0.9rem;
            color: #555;
        }

        .footer-nav {
            display: flex;
            gap: 15px;
        }

        .footer-nav a {
            color: #1a73e8;
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s ease, transform 0.2s ease;
        }

        .footer-nav a:hover {
            color: #135ab6;
            transform: translateY(-2px);
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                flex-direction: column;
                padding: 10px;
            }

            .column {
                flex: 100%;
                min-width: 100%;
            }

            .key {
                padding: 10px;
                font-size: 1rem;
                min-height: 40px;
            }

            .keyboard {
                grid-template-columns: repeat(auto-fit, minmax(35px, 1fr));
                gap: 6px;
            }

            .header-container {
                flex-direction: row;
                justify-content: space-between;
                align-items: center;
            }

            .header-title {
                margin-bottom: 0;
                font-size: 1.5rem;
            }

            .header-nav {
                display: none;
            }

            .header-nav.active {
                display: flex;
            }

            .hamburger {
                display: block;
            }

            .footer-container {
                flex-direction: column;
                text-align: center;
            }

            .footer-nav {
                flex-direction: column;
                gap: 10px;
            }
        }

        /* Scrollbar Styling */
        .column-1::-webkit-scrollbar {
            width: 8px;
        }

        .column-1::-webkit-scrollbar-track {
            background: #f5f5f5;
            border-radius: 8px;
        }

        .column-1::-webkit-scrollbar-thumb {
            background: #1a73e8;
            border-radius: 8px;
        }

        /* Animations */
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

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

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

        @keyframes slideDown {
            from { transform: translateY(-10px); opacity: 0; }
            to { transform: translateY(0); opacity: 1; }
        }