:root{--deep-indigo:#1a1a2e;--nailong-yellow:#FFD93D;--antique-gold:#C9A227;--cream:#F5F5DC;--dark-overlay:rgba(26, 26, 46, 0.95)}*{margin:0;padding:0;box-sizing:border-box}body,html{font-family:'Noto Sans SC',sans-serif;background-color:var(--deep-indigo);color:var(--cream);min-height:100vh;overflow-x:hidden}body:fullscreen{width:100vw;height:100vh}body:-webkit-full-screen{width:100vw;height:100vh}body:-moz-full-screen{width:100vw;height:100vh}.museum-bg{contain:layout style paint;content-visibility:auto;position:fixed;top:0;left:0;width:100%;height:100%;background-image:url('../assets/images/starry-nailong-bg.jpg');background-size:cover;background-position:center;background-repeat:no-repeat;opacity:.3;pointer-events:none;z-index:0}.container{position:relative;z-index:1;max-width:1200px;margin:0 auto;padding:2rem;min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center}.btn-with-label{position:fixed;display:flex;flex-direction:column;align-items:center;gap:5px;z-index:1000}.btn-with-label .btn-label{font-size:.7rem;color:var(--antique-gold);text-shadow:0 1px 3px rgba(0,0,0,.8);white-space:nowrap;opacity:.9}.fullscreen-label-wrapper{top:20px;right:20px}.audio-label-wrapper{bottom:20px;right:20px}.answer-card-label-wrapper{bottom:20px;left:20px}.fullscreen-btn{width:50px;height:50px;background:rgba(201,162,39,.2);border:2px solid var(--antique-gold);border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:var(--antique-gold);transition:all .3s ease}.fullscreen-btn:hover{background:rgba(201,162,39,.4);transform:scale(1.1)}.audio-control{width:50px;height:50px;background:rgba(201,162,39,.2);border:2px solid var(--antique-gold);border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:var(--antique-gold);transition:all .3s ease}.audio-control:hover{background:rgba(201,162,39,.4);transform:scale(1.1)}.audio-control.muted{opacity:.5}.answer-card-btn{width:50px;height:50px;background:rgba(201,162,39,.2);border:2px solid var(--antique-gold);border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:var(--antique-gold);transition:all .3s ease}.answer-card-btn:hover{background:rgba(201,162,39,.4);transform:scale(1.1)}.answer-card-modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.8);z-index:2000;justify-content:center;align-items:center}.answer-card-content{background:var(--deep-indigo);padding:2rem;border-radius:20px;border:2px solid var(--antique-gold);max-width:500px;width:90%;position:relative}.answer-card-content h3{color:var(--antique-gold);text-align:center;margin-bottom:1.5rem;font-size:1.3rem}.answer-card-close{position:absolute;top:10px;right:15px;background:0 0;border:none;color:var(--antique-gold);font-size:1.5rem;cursor:pointer}.answer-card-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.answer-card-cell{aspect-ratio:1;display:flex;align-items:center;justify-content:center;background:rgba(201,162,39,.1);border:2px solid var(--antique-gold);border-radius:10px;color:var(--cream);font-weight:600;cursor:pointer;transition:all .3s ease;font-size:.9rem}.answer-card-cell:hover{background:rgba(201,162,39,.3);transform:scale(1.1)}.answer-card-cell.current{background:var(--nailong-yellow);color:var(--deep-indigo);border-color:var(--nailong-yellow);font-weight:700}.answer-card-cell.answered{background:rgba(0,200,0,.2);border-color:#90ee90}.auth-container{position:fixed;top:20px;left:20px;z-index:1000;display:flex;align-items:center;gap:10px}.auth-btn{padding:.5rem 1rem;background:rgba(201,162,39,.2);border:1px solid var(--antique-gold);border-radius:20px;color:var(--antique-gold);cursor:pointer;font-size:.85rem;transition:all .3s ease}.auth-btn:hover{background:rgba(201,162,39,.4);transform:scale(1.05)}.username-display{color:var(--antique-gold);font-weight:600;font-size:.9rem}.auth-modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.8);z-index:2000;justify-content:center;align-items:center}.auth-modal.show{display:flex}.auth-modal-content{background:var(--deep-indigo);padding:2rem;border-radius:20px;border:2px solid var(--antique-gold);max-width:380px;width:90%;position:relative}.auth-close{position:absolute;top:10px;right:15px;background:0 0;border:none;color:var(--antique-gold);font-size:1.5rem;cursor:pointer}.auth-form h3{color:var(--antique-gold);text-align:center;margin-bottom:1.5rem;font-size:1.3rem}.auth-form input{width:100%;padding:.8rem 1rem;margin-bottom:1rem;border:1px solid var(--antique-gold);border-radius:10px;background:rgba(26,26,46,.5);color:var(--cream);font-size:.95rem}.auth-form input::placeholder{color:rgba(245,245,220,.5)}.auth-submit-btn{width:100%;padding:.8rem;background:linear-gradient(135deg,var(--nailong-yellow) 0,var(--antique-gold) 100%);border:none;border-radius:10px;color:var(--deep-indigo);font-weight:700;cursor:pointer;transition:all .3s ease;font-size:1rem}.auth-submit-btn:hover{transform:translateY(-2px);box-shadow:0 4px 15px rgba(255,217,61,.3)}.auth-error,.auth-success{text-align:center;margin-bottom:1rem;min-height:1.2rem;font-size:.9rem}.auth-error{color:#ffb6c1}.auth-success{color:#90ee90}.auth-form .divider{text-align:center;margin:1rem 0;color:rgba(245,245,220,.5);position:relative}.auth-form .divider::after,.auth-form .divider::before{content:'';position:absolute;top:50%;width:35%;height:1px;background:rgba(201,162,39,.3)}.auth-form .divider::before{left:0}.auth-form .divider::after{right:0}.wechat-btn{width:100%;padding:.7rem;background:#07c160;border:none;border-radius:10px;color:#fff;cursor:not-allowed;opacity:.6;font-size:.9rem}.auth-switch{text-align:center;margin-top:1rem;color:rgba(245,245,220,.8);font-size:.9rem}.auth-switch a{color:var(--antique-gold);text-decoration:none;font-weight:600}.hero-section{text-align:center;animation:fadeIn 1s ease-out}@keyframes fadeIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.nailong-container{will-change:transform;transform:translateZ(0);position:relative;display:inline-block;margin-bottom:2rem}.nailong-img{width:280px;height:280px;object-fit:cover;border-radius:50%;border:4px solid var(--antique-gold);box-shadow:0 0 40px rgba(201,162,39,.3),0 0 80px rgba(201,162,39,.1);animation:breathe 3s ease-in-out infinite}@keyframes breathe{0%,100%{transform:scale(1) translateY(0)}50%{transform:scale(1.02) translateY(-5px)}}.glow-effect{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(255,217,61,.2) 0,transparent 70%);animation:pulse 3s ease-in-out infinite;z-index:-1}@keyframes pulse{0%,100%{opacity:.5;transform:translate(-50%,-50%) scale(1)}50%{opacity:.8;transform:translate(-50%,-50%) scale(1.1)}}.museum-title{margin-bottom:1.5rem}.title-main{display:block;font-family:'Playfair Display',serif;font-size:3rem;font-weight:700;color:var(--antique-gold);text-shadow:2px 2px 4px rgba(0,0,0,.5);letter-spacing:.1em}.title-sub{display:block;font-family:'Playfair Display',serif;font-size:1rem;color:var(--nailong-yellow);letter-spacing:.3em;text-transform:uppercase;margin-top:.5rem;opacity:.8}.museum-desc{font-size:1.1rem;line-height:2;color:rgba(245,245,220,.8);margin-bottom:2.5rem;max-width:500px}.start-btn{position:relative;padding:1rem 3rem;font-size:1.2rem;font-family:'Noto Sans SC',sans-serif;font-weight:500;color:var(--deep-indigo);background:linear-gradient(135deg,var(--nailong-yellow) 0,var(--antique-gold) 100%);border:none;border-radius:50px;cursor:pointer;overflow:hidden;transition:all .3s ease;box-shadow:0 4px 15px rgba(255,217,61,.3),0 0 30px rgba(201,162,39,.2)}.start-btn:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 8px 25px rgba(255,217,61,.4),0 0 50px rgba(201,162,39,.3)}.btn-shine{position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3),transparent);transition:left .5s ease}.start-btn:hover .btn-shine{left:100%}.quiz-container{width:100%;max-width:800px;animation:slideIn .5s ease-out}@keyframes slideIn{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:translateX(0)}}.progress-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;padding:1rem 1.5rem;background:rgba(201,162,39,.1);border:1px solid rgba(201,162,39,.3);border-radius:10px}.progress-text{font-family:'Playfair Display',serif;font-size:1.2rem;color:var(--antique-gold)}.progress-score{font-size:.9rem;color:var(--nailong-yellow)}.painting-frame{position:relative;margin-bottom:2rem;padding:15px;background:linear-gradient(135deg,#2a2a3e 0,#1a1a2e 100%);border:3px solid var(--antique-gold);border-radius:5px;box-shadow:0 10px 40px rgba(0,0,0,.5),inset 0 0 20px rgba(201,162,39,.1)}.painting-frame::before{content:'';position:absolute;top:5px;left:5px;right:5px;bottom:5px;border:1px solid rgba(201,162,39,.3);pointer-events:none}.painting-img{width:100%;max-height:400px;object-fit:contain;display:block;background:#000;clip-path:inset(3% 3% 3% 3%)}.question-text{font-size:1.3rem;text-align:center;margin-bottom:1.5rem;color:var(--cream)}.options-container{display:grid;gap:1rem;margin-bottom:2rem}.option-label{display:flex;align-items:center;padding:1rem 1.5rem;background:rgba(255,255,255,.05);border:2px solid rgba(201,162,39,.3);border-radius:10px;cursor:pointer;transition:all .3s ease}.option-label:hover{background:rgba(201,162,39,.1);border-color:var(--antique-gold)}.option-label input[type=radio]{display:none}.option-label input[type=radio]:checked+.option-text{color:var(--nailong-yellow)}.option-label:has(input[type=radio]:checked){background:rgba(255,217,61,.1);border-color:var(--nailong-yellow);box-shadow:0 0 20px rgba(255,217,61,.2)}.option-text{font-size:1.1rem;margin-left:1rem}.option-marker{width:24px;height:24px;border:2px solid var(--antique-gold);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.8rem;color:var(--antique-gold);flex-shrink:0}.submit-btn{width:100%;padding:1rem;font-size:1.2rem;font-family:'Noto Sans SC',sans-serif;font-weight:500;color:var(--deep-indigo);background:linear-gradient(135deg,var(--nailong-yellow) 0,var(--antique-gold) 100%);border:none;border-radius:10px;cursor:pointer;transition:all .3s ease}.submit-btn:hover{transform:translateY(-2px);box-shadow:0 5px 20px rgba(255,217,61,.3)}.submit-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.feedback-container{width:100%;max-width:600px;text-align:center;animation:fadeIn .5s ease-out}.video-container{margin-bottom:2rem;border-radius:10px;overflow:hidden;box-shadow:0 10px 40px rgba(0,0,0,.5)}.video-container video{width:100%;max-height:300px;display:block}.explanation-section{display:flex;align-items:flex-end;gap:1rem;margin-bottom:2rem;opacity:0;transition:opacity .5s ease}.thinking-nailong{width:120px;height:120px;object-fit:cover;border-radius:50%;border:3px solid var(--antique-gold);flex-shrink:0;clip-path:inset(3% 3% 3% 3%)}.speech-bubble{flex:1;position:relative;background:rgba(255,255,255,.95);color:var(--deep-indigo);padding:1.5rem;border-radius:20px;text-align:left;box-shadow:0 5px 20px rgba(0,0,0,.2)}.speech-bubble::before{content:'';position:absolute;bottom:30px;left:-15px;width:0;height:0;border-top:15px solid transparent;border-bottom:15px solid transparent;border-right:15px solid rgba(255,255,255,.95)}.explanation-title{font-family:'Playfair Display',serif;font-size:1.2rem;color:var(--antique-gold);margin-bottom:.5rem}.explanation-text{font-size:1rem;line-height:1.6}.next-btn{padding:1rem 3rem;font-size:1.1rem;font-family:'Noto Sans SC',sans-serif;font-weight:500;color:var(--deep-indigo);background:linear-gradient(135deg,var(--nailong-yellow) 0,var(--antique-gold) 100%);border:none;border-radius:50px;cursor:pointer;transition:all .3s ease}.next-btn:hover{transform:translateY(-3px);box-shadow:0 8px 25px rgba(255,217,61,.4)}.complete-container{text-align:center;animation:fadeIn 1s ease-out}.pass-video{width:100%;max-width:600px;margin-bottom:2rem;border-radius:10px;overflow:hidden;box-shadow:0 10px 40px rgba(0,0,0,.5)}.final-message{font-family:'Playfair Display',serif;font-size:2.5rem;color:var(--nailong-yellow);text-shadow:0 0 30px rgba(255,217,61,.5);margin-bottom:1rem;animation:glow 2s ease-in-out infinite;opacity:0;transition:opacity 1s ease}@keyframes glow{0%,100%{text-shadow:0 0 30px rgba(255,217,61,.5)}50%{text-shadow:0 0 50px rgba(255,217,61,.8),0 0 80px rgba(255,217,61,.4)}}.final-quote{font-size:1.2rem;color:var(--antique-gold);margin-bottom:2rem}.restart-btn{padding:1rem 2.5rem;font-size:1.1rem;font-family:'Noto Sans SC',sans-serif;font-weight:500;color:var(--cream);background:0 0;border:2px solid var(--antique-gold);border-radius:50px;cursor:pointer;transition:all .3s ease}.restart-btn:hover{background:var(--antique-gold);color:var(--deep-indigo)}@media (max-width:768px){.title-main{font-size:2rem}.nailong-img{width:200px;height:200px}.explanation-section{flex-direction:column;align-items:center}.speech-bubble::before{display:none}.final-message{font-size:1.8rem}.audio-control,.fullscreen-btn{width:40px;height:40px;font-size:1rem}}:fullscreen .container{max-width:100%;padding:1rem}:fullscreen .painting-img{max-height:50vh}.select-container{text-align:center;padding:2rem}.select-title{font-family:'Playfair Display',serif;font-size:2.5rem;color:var(--antique-gold);margin-bottom:1rem}.select-desc{color:rgba(245,245,220,.8);margin-bottom:3rem;font-size:1.1rem}.quiz-options{display:flex;justify-content:center;gap:2rem;flex-wrap:wrap;margin-bottom:3rem}.quiz-option-btn{width:150px;height:150px;background:rgba(201,162,39,.1);border:2px solid var(--antique-gold);border-radius:20px;cursor:pointer;transition:all .3s ease;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem}.quiz-option-btn:hover{background:rgba(201,162,39,.3);transform:translateY(-5px);box-shadow:0 10px 30px rgba(201,162,39,.3)}.option-number{font-size:3rem;font-weight:700;color:var(--nailong-yellow);font-family:'Playfair Display',serif}.option-label{font-size:.9rem;color:var(--cream)}.back-home-btn{padding:.8rem 2rem;background:0 0;border:1px solid var(--antique-gold);border-radius:25px;color:var(--antique-gold);cursor:pointer;transition:all .3s ease}.back-home-btn:hover{background:var(--antique-gold);color:var(--deep-indigo)}.disclaimer-modal{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.9);z-index:3000;display:flex;justify-content:center;align-items:center}.disclaimer-modal.hidden{display:none}.disclaimer-content{background:var(--deep-indigo);padding:2.5rem;border-radius:20px;border:2px solid var(--antique-gold);max-width:500px;width:90%;text-align:center}.disclaimer-content h2{color:var(--antique-gold);margin-bottom:1.5rem;font-size:1.5rem}.disclaimer-text{text-align:left;margin-bottom:2rem;line-height:1.8}.disclaimer-text p{color:var(--cream);margin-bottom:1rem;font-size:.95rem}.disclaimer-text a{color:var(--nailong-yellow);text-decoration:none}.disclaimer-text a:hover{text-decoration:underline}.disclaimer-btn{padding:1rem 3rem;background:linear-gradient(135deg,var(--nailong-yellow) 0,var(--antique-gold) 100%);border:none;border-radius:30px;color:var(--deep-indigo);font-size:1.1rem;font-weight:700;cursor:pointer;transition:all .3s ease}.disclaimer-btn:hover{transform:scale(1.05);box-shadow:0 5px 20px rgba(255,217,61,.4)}.original-painting-section{margin-top:2rem;padding:1.5rem;background:rgba(26,26,46,.6);border-radius:15px;border:1px solid rgba(201,162,39,.3)}.original-title{color:var(--antique-gold);text-align:center;margin-bottom:1rem;font-size:1.1rem}.painting-comparison{display:flex;justify-content:center;gap:2rem;flex-wrap:wrap}.painting-item{text-align:center}.comparison-img{width:200px;height:200px;object-fit:contain;border-radius:10px;border:2px solid var(--antique-gold);box-shadow:0 5px 20px rgba(0,0,0,.3);background:rgba(0,0,0,.35)}.painting-label{margin-top:.5rem;color:var(--cream);font-size:.9rem}.image-error{width:200px;min-height:2.5rem;margin-top:.6rem;padding:.6rem;border:1px solid rgba(255,182,193,.45);border-radius:8px;color:#ffb6c1;background:rgba(255,0,0,.12);font-size:.85rem}.auth-loading{position:relative;color:transparent!important}.auth-loading::after{content:'';position:absolute;width:20px;height:20px;top:50%;left:50%;margin:-10px 0 0 -10px;border:2px solid var(--deep-indigo);border-top-color:transparent;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.submit-label-wrapper{bottom:20px;left:20px}.submit-corner-btn{width:50px;height:50px;background:rgba(201,162,39,.2);border:2px solid var(--antique-gold);border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:var(--antique-gold);transition:all .3s ease}.submit-corner-btn:hover{background:rgba(201,162,39,.4);transform:scale(1.1)}.submission-modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.8);z-index:2000;justify-content:center;align-items:center}.submission-modal-content{background:var(--deep-indigo);padding:2rem;border-radius:20px;border:2px solid var(--antique-gold);max-width:450px;width:90%;position:relative;max-height:90vh;overflow-y:auto}.submission-close{position:absolute;top:10px;right:15px;background:0 0;border:none;color:var(--antique-gold);font-size:1.5rem;cursor:pointer}.submission-modal-content h3{color:var(--antique-gold);text-align:center;margin-bottom:.5rem}.submission-desc{text-align:center;color:rgba(245,245,220,.7);margin-bottom:1.5rem;font-size:.9rem}.upload-area{border:2px dashed var(--antique-gold);border-radius:15px;padding:2rem;text-align:center;margin-bottom:1.5rem;cursor:pointer;transition:all .3s ease;position:relative}.upload-area:hover{background:rgba(201,162,39,.1)}.upload-icon{font-size:2.5rem;display:block;margin-bottom:.5rem}.upload-hint{font-size:.8rem;color:rgba(245,245,220,.5)}.preview-image{max-width:100%;max-height:200px;border-radius:10px}.remove-image{position:absolute;top:10px;right:10px;width:30px;height:30px;background:rgba(255,0,0,.7);border:none;border-radius:50%;color:#fff;cursor:pointer;font-size:1.2rem}.submission-modal-content .form-group{margin-bottom:1rem}.submission-modal-content .form-group label{display:block;margin-bottom:.3rem;color:var(--antique-gold);font-size:.9rem;font-weight:600}.submission-modal-content .form-group input{width:100%;padding:.7rem 1rem;border:1px solid var(--antique-gold);border-radius:10px;background:rgba(26,26,46,.5);color:var(--cream);font-size:.95rem}.submission-modal-content .form-group input::placeholder{color:rgba(245,245,220,.4)}.submit-artwork-btn{width:100%;padding:.8rem;font-size:1rem;font-weight:700;color:var(--deep-indigo);background:linear-gradient(135deg,var(--nailong-yellow) 0,var(--antique-gold) 100%);border:none;border-radius:10px;cursor:pointer;transition:all .3s ease;margin-top:.5rem}.submit-artwork-btn:disabled{opacity:.5;cursor:not-allowed}.submit-artwork-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 15px rgba(255,217,61,.4)}.submit-message{margin-top:1rem;padding:.8rem;border-radius:10px;text-align:center;font-size:.9rem}.submit-message.success{background:rgba(0,255,0,.2);color:#90ee90}.submit-message.error{background:rgba(255,0,0,.2);color:#ffb6c1}img[data-src]{opacity:0;transition:opacity .3s ease}img[data-src].loaded{opacity:1}