:root {
            --light-green: #e0f2e9;
            --medium-green: #a8dadc;
            --dark-green: #2a9d8f;
            --accent: #e76f51;
            --text: #264653;
        }
        
        body {
            font-family: 'Montserrat', sans-serif;
            background-color: var(--light-green);
            color: var(--text);
            min-height: 100vh;
        }
        
        .tab-content {
            display: none;
            animation: fadeIn 0.5s ease-in-out;
        }
        
        .tab-content.active {
            display: block;
        }
        
        .tab-button {
            position: relative;
            transition: all 0.3s ease;
        }
        
        .tab-button.active {
            color: var(--dark-green);
            font-weight: 600;
        }
        
        .tab-button.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--dark-green);
            border-radius: 2px;
        }
        
        .game-cell {
            background-color: #4a9e5c;
            border: 1px solid #3d8a4e;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        
        .game-cell:hover {
            background-color: #5cb36e;
        }
        
        .game-piece {
            width: 80%;
            height: 80%;
            border-radius: 50%;
            position: relative;
            transition: transform 0.5s ease;
        }
        
        .game-piece.black {
            background: radial-gradient(circle at 30% 30%, #444, #111);
            box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }
        
        .game-piece.white {
            background: radial-gradient(circle at 30% 30%, #fff, #ddd);
            box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
        }
        
        .game-piece.flip {
            transform: rotateY(180deg);
        }
        
        .chat-message {
            border-radius: 18px;
            padding: 10px 16px;
            margin: 8px 0;
            max-width: 80%;
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
        }
        
        .user-message {
            background-color: var(--medium-green);
            margin-left: auto;
            border-bottom-right-radius: 4px;
        }
        
        .bot-message {
            background-color: white;
            margin-right: auto;
            border-bottom-left-radius: 4px;
        }
        
        .valid-move-indicator {
            background-color: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            width: 30%;
            height: 30%;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }
        
        .pulse {
            animation: pulse 1s infinite;
        }
        
        .turn-indicator {
            transition: all 0.3s ease;
        }
        
        .turn-indicator.active {
            transform: scale(1.1);
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
        }
        
        .btn-disabled-bot {
            background-color: #9ca3af !important; /* Tailwind gray-400 */
            color: #fff !important;
            border: none !important;
            opacity: 1 !important;
            cursor: not-allowed !important;
        }

        .thinking {
            /* position: relative; */ /* Більше не потрібно */
            display: inline-block;
            min-width: 1.5em; /* Щоб крапки не стрибали */
            vertical-align: middle;
        }
        .thinking::after {
            content: '...';
            /* position: absolute; */ /* Прибрати */
            animation: thinking 1.5s infinite;
            /* margin-left: 4px; */ /* Прибрати */
            display: inline;
        }
        @keyframes thinking {
            0% { content: '.'; }
            33% { content: '..'; }
            66% { content: '...'; }
            100% { content: '.'; }
        }
        
        .custom-select {
            appearance: none;
            background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
            background-repeat: no-repeat;
            background-position: right 0.7rem center;
            background-size: 1em;
        }
        
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(0, 0, 0, 0.5);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 50;
        }
        
        .modal {
            background-color: white;
            border-radius: 8px;
            padding: 20px;
            max-width: 90%;
            width: 400px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            animation: fadeIn 0.3s;
        }
        
        @media (max-width: 640px) {
            .game-board {
                width: 100%;
                max-width: 360px;
            }
            
            .game-cell {
                width: 40px;
                height: 40px;
            }
        }