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

        body {
            font-family: 'Arial', sans-serif;
            background: linear-gradient(to bottom, #87CEEB 0%, #98D8E8 50%, #90EE90 100%);
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
        }

        /* Clouds */
        .cloud {
            position: fixed;
            background: white;
            border-radius: 100px;
            opacity: 0.6;
            animation: float-cloud 30s infinite linear;
        }

        .cloud:before, .cloud:after {
            content: '';
            position: absolute;
            background: white;
            border-radius: 100px;
        }

        .cloud1 {
            top: 10%;
            left: -150px;
            width: 100px;
            height: 40px;
        }
        .cloud1:before { width: 50px; height: 50px; top: -25px; left: 10px; }
        .cloud1:after { width: 60px; height: 40px; top: -15px; right: 10px; }

        .cloud2 {
            top: 30%;
            left: -200px;
            width: 120px;
            height: 45px;
            animation-delay: -15s;
        }
        .cloud2:before { width: 60px; height: 55px; top: -28px; left: 15px; }
        .cloud2:after { width: 70px; height: 45px; top: -18px; right: 15px; }

        @keyframes float-cloud {
            0% { transform: translateX(0); }
            100% { transform: translateX(calc(100vw + 200px)); }
        }

        /* Ground */
        .ground {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 150px;
            background: linear-gradient(to bottom, #8B4513 0%, #654321 100%);
            border-top: 5px solid #6B3410;
            z-index: 1;
        }

        .grass-layer {
            position: fixed;
            bottom: 140px;
            left: 0;
            width: 100%;
            height: 20px;
            background: #228B22;
            z-index: 2;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            padding: 20px;
            position: relative;
            z-index: 10;
        }

        .header {
            text-align: center;
            margin-bottom: 20px;
            background: rgba(255, 255, 255, 0.9);
            padding: 20px;
            border-radius: 20px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

        .header h1 {
            color: #2e7d32;
            font-size: 2.5em;
            margin-bottom: 10px;
        }

        .progress-info {
            display: flex;
            justify-content: space-around;
            font-size: 1.2em;
            color: #1b5e20;
            margin-top: 15px;
            flex-wrap: wrap;
            gap: 10px;
        }

        .progress-item {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .game-area {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        .question-panel {
            background: rgba(255, 255, 255, 0.95);
            padding: 30px;
            border-radius: 20px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

        .question {
            font-size: 3em;
            text-align: center;
            color: #2e7d32;
            margin-bottom: 30px;
            font-weight: bold;
        }

        .answers {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .answer-btn {
            font-size: 2em;
            padding: 20px;
            border: none;
            border-radius: 15px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: bold;
            color: white;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        }

        .answer-btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
        }

        .answer-btn.option1 { background: linear-gradient(135deg, #66bb6a 0%, #43a047 100%); }
        .answer-btn.option2 { background: linear-gradient(135deg, #ab47bc 0%, #8e24aa 100%); }
        .answer-btn.option3 { background: linear-gradient(135deg, #ffa726 0%, #fb8c00 100%); }

        .answer-btn.shake {
            animation: shake 0.5s;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-10px); }
            75% { transform: translateX(10px); }
        }

        .tree-panel {
            background: rgba(255, 255, 255, 0.95);
            padding: 20px;
            border-radius: 20px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
            min-height: 500px;
        }

        .tree-container {
            position: relative;
            width: 100%;
            height: 450px;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            align-items: center;
        }

        .tree-trunk {
            width: 40px;
            background: linear-gradient(to right, #8B4513, #654321);
            border-radius: 5px;
            position: relative;
            transition: height 0.5s ease-out;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
        }

        .tree-element {
            position: absolute;
            font-size: 2.5em;
            animation: grow 0.6s ease-out;
        }

        @keyframes grow {
            0% {
                transform: scale(0);
                opacity: 0;
            }
            50% {
                transform: scale(1.2);
            }
            100% {
                transform: scale(1);
                opacity: 1;
            }
        }

        .tree-element.sparkle {
            animation: grow-sparkle 0.8s ease-out;
        }

        @keyframes grow-sparkle {
            0% {
                transform: scale(0) rotate(0deg);
                opacity: 0;
            }
            50% {
                transform: scale(1.3) rotate(180deg);
            }
            100% {
                transform: scale(1) rotate(360deg);
                opacity: 1;
            }
        }

        .floating-particle {
            position: absolute;
            font-size: 1.5em;
            animation: float-up 2s ease-out forwards;
            pointer-events: none;
        }

        @keyframes float-up {
            0% {
                transform: translateY(0) scale(1);
                opacity: 1;
            }
            100% {
                transform: translateY(-100px) scale(0.3);
                opacity: 0;
            }
        }

        .season-indicator {
            font-size: 1.3em;
            color: #2e7d32;
            margin-top: 15px;
            font-weight: bold;
            text-align: center;
        }

        .end-screen {
            display: none;
            text-align: center;
            background: rgba(255, 255, 255, 0.95);
            padding: 40px;
            border-radius: 20px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

        .end-screen.show {
            display: block;
        }

        .end-screen h2 {
            font-size: 2.5em;
            color: #43a047;
            margin-bottom: 20px;
        }

        .stats {
            font-size: 1.5em;
            color: #1b5e20;
            margin: 20px 0;
        }

        .stats p {
            margin: 10px 0;
        }

        .final-tree {
            font-size: 3em;
            margin: 20px 0;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
        }

        .btn-restart {
            font-size: 1.5em;
            padding: 15px 40px;
            background: linear-gradient(135deg, #66bb6a 0%, #43a047 100%);
            color: white;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            margin: 10px;
            transition: transform 0.3s;
        }

        .btn-restart:hover {
            transform: scale(1.05);
        }

        .butterfly {
            position: fixed;
            font-size: 2em;
            animation: fly 15s infinite ease-in-out;
            z-index: 5;
        }

        @keyframes fly {
            0%, 100% {
                left: -50px;
                top: 30%;
            }
            50% {
                left: 100%;
                top: 50%;
            }
        }

        @media (max-width: 768px) {
            .game-area {
                grid-template-columns: 1fr;
            }

            .header h1 {
                font-size: 2em;
            }

            .question {
                font-size: 2.5em;
            }

            .tree-container {
                height: 350px;
            }
        }