:root{--primary-color: #2e7d32;--primary-light: #e8f5e9;--accent-color: #fbc02d;--text-dark: #2c3e50;--bg-gradient: linear-gradient(135deg, #f1f8e9 0%, #e8f5e9 100%)}.nature-app{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;max-width:800px;margin:0 auto;padding:20px;background:var(--bg-gradient);min-height:100vh;color:var(--text-dark);box-sizing:border-box}.app-header{text-align:center;padding:20px 0;border-bottom:2px dashed #a5d6a7;margin-bottom:20px}.logo-area{display:flex;align-items:center;justify-content:center;gap:10px}.logo-icon{color:var(--primary-color);width:36px;height:36px}.app-header h1{font-size:2rem;color:var(--primary-color);margin:0;font-weight:800}.subtitle{color:#558b2f;margin-top:8px;font-size:1rem}.app-nav{display:flex;justify-content:space-around;background:#fff;padding:10px;border-radius:15px;box-shadow:0 4px 15px #0000000d;margin-bottom:25px;flex-wrap:wrap;gap:8px}.app-nav button{display:flex;align-items:center;gap:6px;background:none;border:none;padding:10px 16px;border-radius:10px;cursor:pointer;font-weight:700;color:#666;transition:all .3s ease}.app-nav button:hover{background:var(--primary-light);color:var(--primary-color)}.app-nav button.active{background:var(--primary-color);color:#fff}.fade-in{animation:fadeIn .4s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.section-title{font-size:1.4rem;color:var(--primary-color);margin-bottom:10px}.section-desc{color:#666;margin-bottom:20px;font-size:.95rem}.secrets-grid{display:grid;grid-template-columns:1fr;gap:15px}.secret-card{background:#fff;border-radius:12px;padding:18px;cursor:pointer;box-shadow:0 4px 10px #00000008;border:1px solid #e0e0e0;transition:transform .2s,box-shadow .2s;position:relative;overflow:hidden}.secret-card:hover{transform:translateY(-2px);box-shadow:0 6px 15px #2e7d321a}.card-badge{display:inline-block;background:var(--primary-light);color:var(--primary-color);font-size:.75rem;padding:4px 8px;border-radius:6px;margin-bottom:10px;font-weight:700}.secret-card h3{margin:0 0 10px;font-size:1.1rem;color:#2c3e50}.click-tip{color:#888;font-size:.85rem;margin:0;text-align:right}.card-detail{margin-top:15px;border-top:1px solid #eee;padding-top:15px;animation:fadeIn .3s ease}.answer-text{line-height:1.6;color:#444}.fact-box{background:#fffde7;border-left:4px solid var(--accent-color);padding:10px;border-radius:4px;margin:15px 0}.fact-tag{font-weight:700;color:#f57f17;font-size:.85rem}.fact-box p{margin:5px 0 0;font-size:.9rem;color:#555}.btn-tts{display:flex;align-items:center;gap:6px;background:#fff3e0;color:#e65100;border:none;padding:8px 12px;border-radius:8px;cursor:pointer;font-weight:700;font-size:.85rem}.btn-tts:hover{background:#ffe0b2}.ai-box{background:#fff;border-radius:15px;padding:20px;box-shadow:0 4px 15px #0000000d}.input-group{display:flex;gap:10px}.input-group input{flex:1;padding:12px 15px;border:2px solid #c8e6c9;border-radius:10px;outline:none;font-size:.95rem;transition:border-color .3s}.input-group input:focus{border-color:var(--primary-color)}.btn-primary{background:var(--primary-color);color:#fff;border:none;padding:0 20px;border-radius:10px;cursor:pointer;display:flex;align-items:center;gap:8px;font-weight:700;white-space:nowrap}.btn-primary:hover{background:#1b5e20}.ai-response-card{margin-top:20px;background:#f1f8e9;border:1px solid #c8e6c9;border-radius:12px;padding:15px;animation:fadeIn .3s ease}.response-header{display:flex;align-items:center;gap:10px;margin-bottom:12px}.avatar{font-size:1.8rem}.response-header h4{margin:0;color:var(--primary-color)}.tag{font-size:.7rem;background:var(--accent-color);color:#333;padding:2px 6px;border-radius:4px;font-weight:700}.response-body{line-height:1.6;color:#333;margin-bottom:15px}.loading-canvas{display:flex;flex-direction:column;align-items:center;padding:40px 0;gap:10px;color:#666}.image-result-card{margin-top:20px;text-align:center}.image-result-card img{max-width:100%;border-radius:12px;box-shadow:0 6px 20px #00000026}.img-info{margin-top:10px;font-weight:700;color:var(--primary-color)}.quiz-card{background:#fff;border-radius:15px;padding:25px;box-shadow:0 4px 15px #0000000d}.quiz-header{display:flex;justify-content:space-between;margin-bottom:15px;font-weight:700;color:#666}.score-badge{display:flex;align-items:center;gap:4px;color:#f57c00}.quiz-question{font-size:1.2rem;margin-bottom:20px;color:#333}.options-list{display:flex;flex-direction:column;gap:12px}.option-btn{padding:14px;border:2px solid #e0e0e0;border-radius:10px;background:#fff;cursor:pointer;text-align:left;font-size:1rem;font-weight:500;transition:all .2s}.option-btn:hover:not(:disabled){border-color:var(--primary-color);background:var(--primary-light)}.option-btn.correct{background:#c8e6c9;border-color:#4caf50;color:#1b5e20}.option-btn.wrong{background:#ffcdd2;border-color:#f44336;color:#b71c1c}.option-btn.disabled{opacity:.6;cursor:not-allowed}.quiz-feedback{margin-top:20px;padding:15px;border-radius:10px;animation:fadeIn .3s}.quiz-feedback.correct{background:#e8f5e9;border-left:5px solid #4caf50}.quiz-feedback.wrong{background:#fff3e0;border-left:5px solid #ff9800}.btn-next{margin-top:15px;background:var(--primary-color);color:#fff;border:none;padding:10px 20px;border-radius:8px;cursor:pointer;display:flex;align-items:center;gap:6px;font-weight:700}.btn-next:hover{background:#1b5e20}.app-footer{text-align:center;margin-top:40px;padding:20px 0;color:#888;font-size:.9rem;border-top:1px solid #e0e0e0}