:root {
            --primary-color: #4caf50;
            --secondary-color: #8bc34a;
            --dark-bg: #1a2a05;
            --light-bg: #3d5a1e;
            --text-color: #ffffff;
            --card-bg: rgba(255, 255, 255, 0.1);
            --hover-bg: rgba(139, 195, 74, 0.3);
            --border-color: rgba(255, 255, 255, 0.2);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, var(--dark-bg), var(--light-bg));
            color: var(--text-color);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 20px;
            position: relative;
            overflow-x: hidden;
            transition: background 0.3s ease;
        }
        
        body.light-mode {
            --primary-color: #2e7d32;
            --secondary-color: #689f38;
            --dark-bg: #f5f5f5;
            --light-bg: #e8f5e9;
            --text-color: #333333;
            --card-bg: rgba(255, 255, 255, 0.8);
            --hover-bg: rgba(139, 195, 74, 0.2);
            --border-color: rgba(0, 0, 0, 0.1);
            background: linear-gradient(135deg, var(--dark-bg), var(--light-bg));
        }
        
        .container {
            max-width: 900px;
            width: 100%;
            text-align: center;
            padding: 30px;
            background: var(--card-bg);
            border-radius: 15px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            backdrop-filter: blur(10px);
            position: relative;
            z-index: 1;
            transition: all 0.3s ease;
        }
        
        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }
        
        .theme-toggle {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 30px;
            padding: 8px 15px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: all 0.3s ease;
        }
        
        .theme-toggle:hover {
            background: var(--hover-bg);
        }
        
        h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            color: var(--secondary-color);
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
            position: relative;
            display: inline-block;
        }
        
        h1::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 25%;
            width: 50%;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--secondary-color), transparent);
        }
        
        .subtitle {
            font-size: 1.2rem;
            margin-bottom: 30px;
            color: #dcedc8;
        }
        
        body.light-mode .subtitle {
            color: #558b2f;
        }
        
        .progress-indicator {
            display: flex;
            justify-content: center;
            margin-bottom: 30px;
        }
        
        .progress-step {
            display: flex;
            align-items: center;
            margin: 0 10px;
            opacity: 0.5;
            transition: opacity 0.3s;
        }
        
        .progress-step.active {
            opacity: 1;
        }
        
        .step-circle {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: rgba(139, 195, 74, 0.3);
            border: 2px solid var(--secondary-color);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 8px;
        }
        
        .step-line {
            width: 40px;
            height: 2px;
            background: rgba(139, 195, 74, 0.3);
            margin: 0 5px;
        }
        
        .search-container {
            margin: 20px 0;
            position: relative;
            width: 100%;
            max-width: 400px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .search-input {
            width: 100%;
            padding: 12px 20px 12px 45px;
            border-radius: 30px;
            border: 1px solid var(--border-color);
            background: var(--card-bg);
            color: var(--text-color);
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        
        .search-icon {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--secondary-color);
        }
        
        .search-input:focus {
            outline: none;
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 3px rgba(139, 195, 74, 0.2);
        }
        
        .tree-fact {
            background: var(--hover-bg);
            border-radius: 10px;
            padding: 15px;
            margin: 20px 0;
            position: relative;
            border-left: 4px solid var(--secondary-color);
            text-align: left;
            display: flex;
            align-items: center;
        }
        
        .tree-fact-icon {
            font-size: 1.5rem;
            margin-right: 15px;
            color: var(--secondary-color);
        }
        
        .tree-fact-text {
            flex: 1;
        }
        
        .tree-fact-title {
            font-weight: bold;
            margin-bottom: 5px;
        }
        
        .refresh-fact {
            background: none;
            border: none;
            color: var(--secondary-color);
            cursor: pointer;
            font-size: 1.2rem;
            transition: transform 0.3s ease;
        }
        
        .refresh-fact:hover {
            transform: rotate(180deg);
        }
        
        .options-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
            margin-top: 30px;
        }
        
        .option-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 25px;
            width: 220px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
            overflow: hidden;
        }
        
        .option-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            transform: translateX(-100%);
            transition: transform 0.3s ease;
        }
        
        .option-card:hover::before {
            transform: translateX(0);
        }
        
        .option-card:hover {
            transform: translateY(-5px);
            background: var(--hover-bg);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .option-icon {
            font-size: 3rem;
            margin-bottom: 15px;
        }
        
        .option-title {
            font-size: 1.4rem;
            font-weight: bold;
            margin-bottom: 10px;
        }
        
        .option-description {
            font-size: 0.9rem;
            color: #e0e0e0;
        }
        
        body.light-mode .option-description {
            color: #555;
        }
        
        .sub-options {
            display: none;
            margin-top: 30px;
            animation: fadeIn 0.5s ease;
        }
        
        .sub-options.active {
            display: block;
        }
        
        .back-btn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 30px;
            cursor: pointer;
            font-size: 1rem;
            margin-bottom: 20px;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
        }
        
        .back-btn:hover {
            background: #388e3c;
            transform: translateX(-5px);
        }
        
        .back-btn i {
            margin-right: 8px;
        }
        
        .language-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }
        
        .language-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
            overflow: hidden;
        }
        
        .language-card::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.3s ease;
        }
        
        .language-card:hover::after {
            transform: scaleX(1);
        }
        
        .language-card:hover {
            background: var(--hover-bg);
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .flag-icon {
            font-size: 2.5rem;
            margin-bottom: 10px;
        }
        
        .language-name {
            font-size: 1.2rem;
            font-weight: 600;
        }
        
        .language-native {
            font-size: 0.9rem;
            color: #dcedc8;
            margin-top: 5px;
        }
        
        body.light-mode .language-native {
            color: #558b2f;
        }
        
        .language-info {
            position: absolute;
            bottom: 10px;
            right: 10px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            cursor: pointer;
            opacity: 0.7;
            transition: all 0.3s ease;
        }
        
        .language-info:hover {
            opacity: 1;
            transform: scale(1.1);
        }
        
        .tooltip {
            position: absolute;
            background: rgba(0, 0, 0, 0.8);
            color: white;
            padding: 8px 12px;
            border-radius: 6px;
            font-size: 0.8rem;
            z-index: 10;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s;
            max-width: 200px;
            text-align: center;
        }
        
        .tooltip.show {
            opacity: 1;
        }
        
        .confirmation {
            display: none;
            text-align: center;
            padding: 30px;
            animation: fadeIn 0.5s ease;
        }
        
        .confirmation.active {
            display: block;
        }
        
        .confirmation-icon {
            font-size: 4rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }
        
        .confirmation-title {
            font-size: 1.8rem;
            margin-bottom: 15px;
        }
        
        .confirmation-details {
            font-size: 1.2rem;
            margin-bottom: 30px;
            color: #dcedc8;
        }
        
        body.light-mode .confirmation-details {
            color: #558b2f;
        }
        
        .action-buttons {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-top: 20px;
        }
        
        .action-btn {
            padding: 12px 25px;
            border-radius: 30px;
            border: none;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
        }
        
        .btn-primary {
            background: var(--primary-color);
            color: white;
        }
        
        .btn-primary:hover {
            background: #388e3c;
            transform: translateY(-3px);
        }
        
        .btn-secondary {
            background: var(--card-bg);
            color: var(--text-color);
            border: 1px solid var(--border-color);
        }
        
        .btn-secondary:hover {
            background: var(--hover-bg);
        }
        
        .action-btn i {
            margin-right: 8px;
        }
        
        .share-btn {
            position: absolute;
            top: 20px;
            right: 70px;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 30px;
            padding: 8px 15px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: all 0.3s ease;
        }
        
        .share-btn:hover {
            background: var(--hover-bg);
        }
        
        .tree-decoration {
            position: absolute;
            bottom: 20px;
            right: 20px;
            font-size: 4rem;
            opacity: 0.3;
            z-index: 0;
        }
        
        .tree-decoration-left {
            position: absolute;
            bottom: 20px;
            left: 20px;
            font-size: 4rem;
            opacity: 0.3;
            z-index: 0;
            transform: scaleX(-1);
        }
        
        .floating-particles {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: 0;
        }
        
        .particle {
            position: absolute;
            background: rgba(139, 195, 74, 0.4);
            border-radius: 50%;
            pointer-events: none;
            animation: float 15s infinite linear;
        }
        
        .footer {
            margin-top: 30px;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
            font-size: 0.9rem;
            color: #dcedc8;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        body.light-mode .footer {
            color: #558b2f;
        }
        
        .social-links {
            display: flex;
            gap: 10px;
        }
        
        .social-links a {
            color: var(--secondary-color);
            font-size: 1.2rem;
            transition: transform 0.3s ease;
        }
        
        .social-links a:hover {
            transform: translateY(-3px);
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        @keyframes float {
            0% { transform: translateY(0) rotate(0deg); opacity: 0; }
            10% { opacity: 1; }
            90% { opacity: 1; }
            100% { transform: translateY(-100vh) rotate(360deg); opacity: 0; }
        }
        
        @media (max-width: 768px) {
            .container {
                padding: 20px;
            }
            
            h1 {
                font-size: 2.2rem;
            }
            
            .language-grid {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            }
            
            .action-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .footer {
                flex-direction: column;
                gap: 15px;
            }
        }