* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
        }

        h1 {
            text-align: center;
            color: white;
            font-size: 2.5rem;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .subtitle {
            text-align: center;
            color: #f0f0f0;
            margin-bottom: 30px;
        }

        /* Keyboard Instruction */
        .keyboard-instruction {
            text-align: center;
            background: rgba(255,255,255,0.2);
            padding: 15px 30px;
            border-radius: 50px;
            margin-bottom: 30px;
            display: inline-block;
            width: 100%;
        }

        .keyboard-instruction span {
            color: white;
            font-size: 1.1rem;
        }

        .keyboard-icon {
            font-size: 1.5rem;
            margin-right: 10px;
            animation: bounce 1s infinite;
        }

        @keyframes bounce {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-5px); }
        }

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

        .alphabet-input {
            width: 120px;
            height: 120px;
            font-size: 3.5rem;
            text-align: center;
            text-transform: uppercase;
            border: none;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
            outline: none;
            transition: all 0.3s;
            font-weight: bold;
            color: #333;
        }

        .alphabet-input:focus {
            transform: scale(1.1);
            box-shadow: 0 15px 40px rgba(0,0,0,0.4);
        }

        .alphabet-input.pressed {
            background: #ffd700;
            transform: scale(1.15);
        }

        .alphabet-buttons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 8px;
            margin-top: 20px;
        }

        .alpha-btn {
            width: 45px;
            height: 45px;
            border: none;
            border-radius: 10px;
            background: white;
            font-size: 1.2rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.2s;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }

        .alpha-btn:hover {
            background: #ffd700;
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.2);
        }

        .alpha-btn.active {
            background: #ffd700;
            transform: scale(1.2);
            box-shadow: 0 8px 20px rgba(255,215,0,0.5);
        }

        /* Key Press Animation */
        .key-press-indicator {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 150px;
            font-weight: bold;
            color: rgba(255,255,255,0.3);
            pointer-events: none;
            opacity: 0;
            transition: opacity 0.3s;
            z-index: 1000;
        }

        .key-press-indicator.show {
            animation: keyPop 0.5s ease-out;
        }

        @keyframes keyPop {
            0% { 
                opacity: 1; 
                transform: translate(-50%, -50%) scale(0.5);
            }
            50% { 
                opacity: 0.8; 
                transform: translate(-50%, -50%) scale(1.2);
            }
            100% { 
                opacity: 0; 
                transform: translate(-50%, -50%) scale(1.5);
            }
        }

        .results {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }

        .category-card {
            background: white;
            border-radius: 15px;
            padding: 20px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            transition: all 0.3s;
            opacity: 0;
            transform: translateY(20px);
        }

        .category-card.show {
            opacity: 1;
            transform: translateY(0);
        }

        .category-card:hover {
            transform: translateY(-5px);
        }

        .category-card h3 {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #eee;
        }

        .category-card.names h3 { color: #e74c3c; }
        .category-card.places h3 { color: #3498db; }
        .category-card.animals h3 { color: #27ae60; }
        .category-card.things h3 { color: #9b59b6; }

        .category-card ul {
            list-style: none;
        }

        .category-card li {
            padding: 8px 0;
            border-bottom: 1px dashed #eee;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: all 0.2s;
        }

        .category-card li:hover {
            background: #f8f9fa;
            padding-left: 10px;
            border-radius: 5px;
        }

        .category-card li:last-child {
            border-bottom: none;
        }

        .emoji {
            font-size: 1.5rem;
        }

        .no-result {
            text-align: center;
            color: white;
            font-size: 1.2rem;
            padding: 50px;
            background: rgba(255,255,255,0.1);
            border-radius: 15px;
        }

        .selected-letter {
            text-align: center;
            font-size: 1.5rem;
            color: white;
            margin-bottom: 20px;
        }

        .selected-letter span {
            background: #ffd700;
            color: #333;
            padding: 10px 40px;
            border-radius: 10px;
            font-weight: bold;
            font-size: 2rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }

        /* Sound Wave Animation */
        .sound-wave {
            display: flex;
            justify-content: center;
            gap: 5px;
            margin-top: 15px;
        }

        .sound-bar {
            width: 5px;
            height: 20px;
            background: white;
            border-radius: 5px;
            animation: soundWave 0.5s ease-in-out infinite;
        }

        .sound-bar:nth-child(1) { animation-delay: 0s; }
        .sound-bar:nth-child(2) { animation-delay: 0.1s; }
        .sound-bar:nth-child(3) { animation-delay: 0.2s; }
        .sound-bar:nth-child(4) { animation-delay: 0.3s; }
        .sound-bar:nth-child(5) { animation-delay: 0.4s; }

        @keyframes soundWave {
            0%, 100% { height: 10px; }
            50% { height: 30px; }
        }

        /* Footer */
        .footer {
            text-align: center;
            color: rgba(255,255,255,0.7);
            margin-top: 40px;
            padding: 20px;
        }

        /* Responsive */
        @media (max-width: 600px) {
            h1 { font-size: 1.8rem; }
            .alphabet-input { width: 80px; height: 80px; font-size: 2.5rem; }
            .alpha-btn { width: 35px; height: 35px; font-size: 1rem; }
        }