@import"https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;700&family=DM+Serif+Display&display=swap";:root{--bg: #F4F9F4;--surface: #FFFFFF;--primary: #3A8C5A;--primary-dark: #286B40;--accent: #8FBC4A;--text: #1F2E1F;--text-muted: #5C7065;--border: #D8E5D8;--success: #3A8C5A;--warning: #D4A574;--danger: #C97B7B;--radius: 20px;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);font-family:DM Sans,Inter,PingFang SC,sans-serif}body{background:radial-gradient(circle at 80% 20%,#3A8C5A15 0%,transparent 50%),var(--bg);color:var(--text);margin:0;min-height:100vh}.app{max-width:600px;margin:0 auto;padding:16px;position:relative;overflow:hidden}header{margin-bottom:16px}.title-row{display:flex;align-items:center;justify-content:space-between}.title-row h1{font-family:"DM Serif Display",serif;font-size:24px;color:var(--text);margin:0}.cloud-badge{background:#e8f5e9;color:var(--primary-dark);padding:2px 10px;border-radius:12px;font-size:12px}.cloud-status{text-align:center;background:#e8f5e9;padding:4px 12px;border-radius:12px;font-size:13px;margin-top:4px;color:var(--primary-dark)}.start-screen{display:flex;flex-direction:column;align-items:center;padding:40px 16px;text-align:center}.start-screen h2{font-family:"DM Serif Display",serif;font-size:28px;margin:16px 0 8px}.start-screen p{color:var(--text-muted);line-height:1.6}.features{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin:16px 0}.features span{background:var(--surface);padding:6px 14px;border-radius:var(--radius);box-shadow:var(--shadow);display:flex;align-items:center;gap:6px;font-size:14px}.btn-primary{background:var(--primary);color:#fff;border:none;padding:12px 28px;border-radius:var(--radius);font-size:16px;display:inline-flex;align-items:center;gap:8px;cursor:pointer;transition:background .2s}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:transparent;border:2px solid var(--primary);color:var(--primary);padding:10px 24px;border-radius:var(--radius);font-size:14px;display:inline-flex;align-items:center;gap:6px;cursor:pointer}.hero-svg{margin-bottom:8px}.game-screen{padding:0 4px}.stats-bar{display:flex;justify-content:space-between;align-items:center;background:var(--surface);padding:8px 16px;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:12px}.stats-bar span{display:flex;align-items:center;gap:4px;font-size:14px;font-weight:500}.progress-container{margin-bottom:16px}.progress-track{height:6px;background:var(--border);border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .3s}.question-area{background:var(--surface);padding:20px;border-radius:var(--radius);box-shadow:var(--shadow)}.q-text{font-size:18px;font-weight:500;margin:0 0 16px;line-height:1.5}.options{display:flex;flex-direction:column;gap:10px}.option-btn{padding:12px 16px;border:2px solid var(--border);border-radius:12px;background:#fff;font-size:15px;cursor:pointer;text-align:left;display:flex;align-items:center;gap:10px;transition:border .2s,background .2s}.option-btn:hover:not(:disabled){border-color:var(--primary)}.option-btn.correct{border-color:var(--success);background:#e8f5e9}.option-btn.wrong{border-color:var(--danger);background:#ffebee}.opt-letter{width:28px;height:28px;border-radius:50%;background:#f0f0f0;display:flex;align-items:center;justify-content:center;font-weight:700}.feedback-box{margin-top:16px;padding:12px 16px;border-radius:12px;background:#f9f9f9}.feedback-box p{margin:4px 0}.explanation{color:var(--text-muted);font-size:14px}.btn-next{margin-top:12px;background:var(--accent);color:#fff;border:none;padding:10px 24px;border-radius:var(--radius);font-size:15px;cursor:pointer;transition:background .2s}.btn-next:hover{background:#7ca83a}.btn-ai-gen{margin-top:12px;background:transparent;border:2px dashed var(--primary);color:var(--primary);padding:8px 16px;border-radius:var(--radius);font-size:14px;cursor:pointer;display:flex;align-items:center;gap:6px;justify-content:center;width:100%}.btn-ai-gen:disabled{opacity:.5;cursor:not-allowed}.gameover-screen{display:flex;justify-content:center;padding:20px 0}.result-card{background:var(--surface);padding:28px 20px;border-radius:24px;box-shadow:0 8px 30px #00000014;text-align:center;width:100%}.result-card h2{font-family:"DM Serif Display",serif;margin:0 0 12px;display:flex;align-items:center;justify-content:center;gap:8px}.score-display{display:flex;align-items:baseline;justify-content:center;gap:6px;margin:8px 0}.final-score{font-size:48px;font-weight:700;color:var(--primary);line-height:1}.label{font-size:20px;color:var(--text-muted)}.record{color:var(--text-muted);margin:4px 0;font-size:14px}.detail{font-size:14px;color:var(--text-muted)}.chart{margin:16px 0}.chart h4{margin:0 0 8px;font-size:14px;color:var(--text-muted)}.action-buttons{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:16px}.review-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000004d;display:flex;align-items:center;justify-content:center;z-index:10;padding:16px}.review-panel{background:var(--surface);border-radius:24px;padding:24px;max-width:500px;width:100%;max-height:80vh;overflow-y:auto}.review-panel h3{margin:0 0 12px}.wrong-item{border-bottom:1px solid var(--border);padding:12px 0}.wrong-item p{margin:4px 0}.correct-answer{color:var(--success);font-weight:500}.decor-bg{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:-1}.tree-svg{position:absolute;bottom:20px;left:10px}.fire-svg{position:absolute;top:20px;right:10px}.shield-svg{position:absolute;bottom:40px;right:10px}