:root{--blue: #4a9eff;--blue-light: #e8f3ff;--green: #3dba6f;--green-light: #eafaf1;--orange: #fa8c16;--orange-light:#fff3e8;--red: #ff4d4f;--gray: #6c757d;--gray-light: #f4f6f8;--white: #ffffff;--text: #1a1a2e;--text-sub: #555;--radius-sm: 8px;--radius-md: 16px;--radius-lg: 24px;--radius-xl: 50px;--shadow-sm: 0 2px 8px rgba(0,0,0,.1);--shadow-md: 0 4px 16px rgba(0,0,0,.14);--shadow-lg: 0 8px 32px rgba(0,0,0,.16);--transition: .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:Noto Sans TC,PingFang TC,Microsoft JhengHei,system-ui,sans-serif;background:var(--gray-light);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased}button{cursor:pointer;border:none;background:none;font-family:inherit}img{display:block;max-width:100%}.app-root{min-height:100vh;display:flex;flex-direction:column;background:linear-gradient(160deg,#f0f7ff,#f8fff4,#fffaf0)}.app-header{display:flex;align-items:center;gap:10px;padding:14px 20px;background:var(--white);box-shadow:var(--shadow-sm);position:sticky;top:0;z-index:100}.app-header-icon{font-size:1.6rem}.app-header-title{font-size:1.1rem;font-weight:700;color:var(--text);flex:1}.app-header-stage{font-size:.85rem;font-weight:600;padding:4px 12px;border-radius:var(--radius-xl);background:var(--blue-light);color:var(--blue)}.stage-banner{text-align:center;font-size:.9rem;font-weight:600;padding:8px 20px;letter-spacing:.02em}.stage1-banner{background:linear-gradient(90deg,#e8f3ff,#eaf7ff);color:#1a6db5;border-bottom:2px solid #bee3ff}.stage2-banner{background:linear-gradient(90deg,#eafaf1,#f0fff8);color:#1a7a4a;border-bottom:2px solid #b7f0d0}.app-main{flex:1;display:flex;flex-direction:column;align-items:center;padding:0 0 40px;width:100%}.stage-screen{width:100%;max-width:680px;margin:0 auto;padding:16px 16px 80px;display:flex;flex-direction:column;gap:14px}.progress-bar-wrap{display:flex;justify-content:space-between;align-items:center;gap:10px}.progress-pill{font-size:.88rem;font-weight:600;padding:5px 14px;border-radius:var(--radius-xl);background:var(--white);box-shadow:var(--shadow-sm);color:var(--text-sub)}.score-pill{color:var(--green)}.progress-track{height:6px;border-radius:var(--radius-xl);background:#e0e0e0;overflow:hidden;margin-bottom:4px}.progress-fill{height:100%;background:linear-gradient(90deg,var(--blue),var(--green));border-radius:var(--radius-xl);transition:width .4s ease}.image-choices{display:flex;gap:16px;justify-content:center}.img-choice-card{flex:1;max-width:280px;border-radius:var(--radius-md);background:var(--white);box-shadow:var(--shadow-md);overflow:hidden;border:3px solid transparent;transition:border-color var(--transition),transform var(--transition),box-shadow var(--transition);padding:0;display:flex;flex-direction:column}.img-choice-card:hover:not(:disabled){border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.img-choice-card.img-selected{border-color:var(--blue);box-shadow:0 0 0 3px #4a9eff40,var(--shadow-md)}.img-choice-card.img-correct{border-color:var(--green)!important;box-shadow:0 0 0 4px #3dba6f4d,var(--shadow-md)!important}.img-choice-card:disabled{cursor:default;opacity:.85}.choice-img{width:100%;aspect-ratio:1 / 1;object-fit:cover}.img-placeholder{width:100%;aspect-ratio:1 / 1;background:var(--gray-light);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:var(--gray)}.emoji-placeholder{font-size:3rem}.img-placeholder-text{font-size:1.1rem;font-weight:600}.img-label{padding:10px 8px;font-size:1.1rem;font-weight:700;text-align:center;color:var(--text);background:var(--white)}.control-section{background:var(--white);border-radius:var(--radius-md);padding:14px 16px;box-shadow:var(--shadow-sm)}.play-btn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:14px;border-radius:var(--radius-md);background:linear-gradient(135deg,var(--blue),#2176d6);color:var(--white);font-size:1.05rem;font-weight:700;letter-spacing:.02em;box-shadow:0 4px 12px #4a9eff59;transition:opacity var(--transition),transform var(--transition)}.play-btn:hover{opacity:.92}.play-btn:active{transform:scale(.97)}.play-btn-active{background:linear-gradient(135deg,#63b3ed,#4a9eff);animation:pulse-glow 1s ease-in-out infinite}.play-icon{font-size:1.4rem}@keyframes pulse-glow{0%,to{box-shadow:0 4px 12px #4a9eff59}50%{box-shadow:0 4px 24px #4a9effa6}}.noise-control{display:flex;flex-direction:column;gap:10px}.noise-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.noise-label{font-size:.88rem;font-weight:600;color:var(--text-sub);min-width:52px}.noise-btns{display:flex;gap:6px;flex-wrap:wrap}.noise-btn{padding:6px 14px;border-radius:var(--radius-xl);font-size:.84rem;font-weight:600;border:2px solid #ddd;background:var(--gray-light);color:var(--text-sub);transition:all var(--transition)}.noise-btn.active{border-color:var(--blue);background:var(--blue-light);color:var(--blue)}.noise-btn:hover:not(.active){border-color:#aaa;background:#eee}.noise-slider{flex:1;min-width:100px;accent-color:var(--blue);cursor:pointer;height:6px}.noise-indicator{display:flex;align-items:center;gap:6px;font-size:.82rem;color:var(--blue);font-weight:600;animation:noise-fade 1.4s ease-in-out infinite}.noise-wave{letter-spacing:-2px;animation:wave-anim .6s steps(3) infinite}@keyframes wave-anim{0%{opacity:1}33%{opacity:.5}66%{opacity:.8}to{opacity:1}}@keyframes noise-fade{0%,to{opacity:1}50%{opacity:.7}}.video-toggle-row{display:flex;align-items:center;gap:12px;margin-bottom:6px}.toggle-btn{padding:5px 16px;border-radius:var(--radius-xl);font-size:.84rem;font-weight:700;border:2px solid #ddd;background:var(--gray-light);color:var(--text-sub);transition:all var(--transition)}.toggle-btn.active{border-color:var(--orange);background:var(--orange-light);color:var(--orange)}.video-area{overflow:hidden;margin-top:6px}.mouth-video{width:100%;border-radius:var(--radius-md);background:#000}.video-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;background:#e8e8e8;border-radius:var(--radius-md);padding:28px;font-size:.95rem;font-weight:600;color:var(--gray)}.video-placeholder-icon{font-size:2.5rem;opacity:.5}.practice-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:flex;align-items:center;justify-content:center;z-index:200;padding:20px}.practice-ans-card{background:var(--white);border-radius:var(--radius-lg);padding:28px 32px;box-shadow:var(--shadow-lg);text-align:center;max-width:340px;width:100%;display:flex;flex-direction:column;align-items:center;gap:12px}.practice-ans-title{font-size:.9rem;font-weight:600;color:var(--gray);text-transform:uppercase;letter-spacing:.1em}.practice-ans-word{font-size:2rem;font-weight:800;color:var(--green)}.practice-ans-sentence{font-size:1.3rem;font-weight:700;color:var(--green);line-height:1.4}.practice-ans-img{width:140px;height:140px;object-fit:cover;border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.practice-ans-emoji-row{display:flex;align-items:center;gap:10px;font-size:2.2rem}.continue-btn{margin-top:6px;padding:12px 28px;border-radius:var(--radius-xl);background:linear-gradient(135deg,var(--green),#28a060);color:var(--white);font-size:1rem;font-weight:700;box-shadow:0 4px 12px #3dba6f59;transition:opacity var(--transition)}.continue-btn:hover{opacity:.9}.play-center{display:flex;flex-direction:column;align-items:center;gap:8px;padding:10px 0}.play-circle-btn{width:88px;height:88px;border-radius:50%;background:linear-gradient(135deg,var(--blue),#2176d6);display:flex;align-items:center;justify-content:center;box-shadow:0 6px 20px #4a9eff66;transition:transform var(--transition),box-shadow var(--transition)}.play-circle-btn:hover{transform:scale(1.05);box-shadow:0 8px 28px #4a9eff80}.play-circle-active{animation:pulse-glow 1s ease-in-out infinite}.play-circle-icon{font-size:2.4rem;line-height:1}.play-hint{font-size:.88rem;color:var(--text-sub);font-weight:500}.option-grid-2x2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.option-card{background:var(--card-bg, var(--white));border-radius:var(--radius-md);box-shadow:var(--shadow-md);border:3px solid transparent;padding:16px 10px 12px;display:flex;flex-direction:column;align-items:center;gap:8px;transition:border-color var(--transition),transform var(--transition),box-shadow var(--transition);position:relative}.option-card:hover:not(:disabled){border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.option-card.opt-selected{border-color:var(--blue);box-shadow:0 0 0 3px #4a9eff40,var(--shadow-md)}.option-card.opt-correct{border-color:var(--green)!important;box-shadow:0 0 0 4px #3dba6f4d,var(--shadow-md)!important}.option-card:disabled{cursor:default;opacity:.85}.opt-label-letter{position:absolute;top:8px;left:12px;font-size:.78rem;font-weight:800;color:var(--gray);background:#ffffffb3;border-radius:50%;width:22px;height:22px;display:flex;align-items:center;justify-content:center}.opt-emoji-row{display:flex;align-items:center;gap:6px}.opt-person{font-size:2.4rem;line-height:1}.opt-arrow{font-size:1rem;color:var(--gray)}.opt-object{font-size:2.4rem;line-height:1}.opt-text{font-size:.82rem;font-weight:600;color:var(--text-sub);text-align:center;line-height:1.3}.option-img{width:100%;height:150px;object-fit:cover;border-radius:12px;box-shadow:var(--shadow-sm)}.result-action-row{display:flex;gap:12px;align-items:center;justify-content:center;width:100%}.primary-btn,.secondary-btn{padding:10px 18px;border-radius:999px;font-weight:800}.primary-btn{background:linear-gradient(135deg,var(--blue),#2176d6);color:#fff}.secondary-btn{background:var(--gray-light);color:var(--text)}.correct-list{display:flex;flex-direction:column;gap:10px}.correct-item{display:flex;align-items:center;gap:12px;background:var(--gray-light);padding:10px;border-radius:12px}.result-screen{width:100%;max-width:560px;margin:0 auto;padding:32px 20px 120px;display:flex;flex-direction:column;align-items:center;gap:20px;position:relative;min-height:calc(100vh - 120px)}.celebration-mascot{font-size:clamp(5rem,18vw,9rem);line-height:1;filter:drop-shadow(0 8px 24px rgba(250,140,22,.3))}.result-title{font-size:clamp(1.5rem,5vw,2rem);font-weight:800;color:var(--text);text-align:center}.score-cards{display:flex;flex-direction:column;gap:12px;width:100%}.score-card{border-radius:var(--radius-md);padding:18px 22px;box-shadow:var(--shadow-md);display:flex;align-items:center;gap:12px;background:var(--white)}.stage1-card{border-left:6px solid var(--blue)}.stage2-card{border-left:6px solid var(--green)}.total-card{border-left:6px solid var(--orange);background:linear-gradient(135deg,#fffaf0,#fff8f0)}.score-card-label{flex:1;font-size:.92rem;font-weight:600;color:var(--text-sub)}.score-card-value{font-size:1.8rem;font-weight:800;color:var(--text);line-height:1}.score-card-total{font-size:1.1rem;color:var(--gray);font-weight:600}.score-card-pct{font-size:1rem;font-weight:700;color:var(--gray);min-width:44px;text-align:right}.total-value,.total-pct{color:var(--orange)}.result-detail-btn{position:fixed;bottom:28px;right:24px;padding:12px 20px;border-radius:var(--radius-xl);background:linear-gradient(135deg,#1a1a2e,#2d2d4e);color:var(--white);font-size:.92rem;font-weight:700;box-shadow:0 4px 18px #00000047;z-index:150;transition:transform var(--transition),box-shadow var(--transition);letter-spacing:.02em}.result-detail-btn:hover{transform:translateY(-2px);box-shadow:0 6px 24px #0000005c}.details-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:300;display:flex;align-items:flex-end}.details-panel{background:var(--white);border-radius:var(--radius-lg) var(--radius-lg) 0 0;width:100%;max-height:85vh;display:flex;flex-direction:column;box-shadow:0 -8px 40px #0000002e}.details-header{display:flex;align-items:center;justify-content:space-between;padding:18px 22px 14px;border-bottom:1px solid #eee;position:sticky;top:0;background:var(--white);border-radius:var(--radius-lg) var(--radius-lg) 0 0}.details-header h2{font-size:1.15rem;font-weight:700}.close-btn{width:32px;height:32px;border-radius:50%;background:var(--gray-light);font-size:1rem;display:flex;align-items:center;justify-content:center;transition:background var(--transition)}.close-btn:hover{background:#ddd}.details-body{overflow-y:auto;padding:16px 22px 32px;display:flex;flex-direction:column;gap:20px}.details-summary{display:flex;gap:16px;flex-wrap:wrap;font-size:.92rem;font-weight:600;color:var(--text-sub);padding:12px 16px;background:var(--gray-light);border-radius:var(--radius-md)}.wrong-section h3{font-size:.98rem;font-weight:700;margin-bottom:10px;color:var(--text)}.wrong-list{display:flex;flex-direction:column;gap:10px}.wrong-item{display:flex;align-items:center;gap:12px;background:var(--gray-light);border-radius:var(--radius-md);padding:12px 14px}.wrong-thumb{width:56px;height:56px;border-radius:var(--radius-sm);object-fit:cover;flex-shrink:0}.wrong-sentence-icon{font-size:1.8rem;flex-shrink:0}.wrong-info{display:flex;flex-direction:column;gap:4px;font-size:.88rem}.wrong-pair{font-weight:700;font-size:1rem}.wrong-vs{color:var(--gray);font-size:.85rem}.wrong-sentence{font-weight:700;font-size:.98rem;color:var(--text);margin-bottom:2px}.wrong-chose{color:var(--red);font-weight:700}.wrong-ans{color:var(--green);font-weight:700}@media (max-width: 480px){.image-choices{gap:10px}.img-choice-card{max-width:none}.img-label{font-size:1rem;padding:8px 6px}.opt-person,.opt-object{font-size:2rem}.option-card{padding:12px 8px 10px}.play-circle-btn{width:72px;height:72px}.play-circle-icon{font-size:2rem}}@media (min-width: 640px){.option-card{padding:20px 14px 16px}.opt-person,.opt-object{font-size:2.8rem}}