:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light;color:#000;background-color:#fff;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid #ccc;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#f5f5f5;color:#000;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light;color:#000;background-color:#fff;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.02)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}body{margin:0;display:flex;justify-content:center;align-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1;animation:fadeIn .6s ease-out}h2{animation:fadeIn .4s ease-out}button{border-radius:8px;border:1px solid #ccc;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#f5f5f5;color:#000;cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden}button:hover{border-color:#646cff;transform:translateY(-2px);box-shadow:0 4px 12px #646cff4d}button:active{transform:translateY(0)}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}button:disabled{opacity:.6;cursor:not-allowed;transform:none}button:disabled:hover{transform:none;box-shadow:none}button.loading{background:linear-gradient(90deg,#f5f5f5 25%,#e0e0e0,#f5f5f5 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}.container{max-width:800px;margin:0 auto;padding:2rem;text-align:center;animation:fadeIn .5s ease-out}.card{padding:2em;border:1px solid #ddd;border-radius:12px;margin-top:1em;background-color:#fff;animation:fadeIn .5s ease-out;transition:all .3s ease}.card:hover{border-color:#646cff;box-shadow:0 8px 24px #0003}.input-group{margin-bottom:1em;text-align:left;animation:slideIn .4s ease-out}label{display:block;margin-bottom:.5em;font-weight:700;transition:color .2s}input,select{width:100%;padding:.5em;font-size:1em;box-sizing:border-box;transition:all .3s ease;border:1px solid #ccc;border-radius:4px;background-color:#fff;color:#000}input:focus,select:focus{border-color:#646cff;box-shadow:0 0 0 3px #646cff33;outline:none}.error{color:#ff4d4f;margin-top:1em;animation:fadeIn .3s ease-out;padding:.8em;background-color:#ff4d4f1a;border-radius:6px;border:1px solid rgba(255,77,79,.3)}.success{color:#52c41a;margin-top:1em;animation:fadeIn .3s ease-out;padding:.8em;background-color:#52c41a1a;border-radius:6px;border:1px solid rgba(82,196,26,.3)}pre{text-align:left;background:#f5f5f5;color:#000;padding:1em;border-radius:4px;overflow-x:auto}.debug-info{margin-top:2rem;font-size:.8em;opacity:.7;text-align:left;border-top:1px solid #ddd;padding-top:1rem;animation:fadeIn .6s ease-out .3s both}.question-card{animation:fadeIn .4s ease-out}.option-item{transition:all .2s ease}.option-item:hover{transform:translate(5px);background-color:#646cff1a}.progress-bar{transition:width .5s ease-out}.result-item{animation:slideIn .4s ease-out;animation-fill-mode:both}.result-item:nth-child(1){animation-delay:.1s}.result-item:nth-child(2){animation-delay:.2s}.result-item:nth-child(3){animation-delay:.3s}.result-item:nth-child(4){animation-delay:.4s}.result-item:nth-child(5){animation-delay:.5s}.form-field{animation:slideIn .4s ease-out;animation-fill-mode:both}.form-field:nth-child(1){animation-delay:.05s}.form-field:nth-child(2){animation-delay:.1s}.form-field:nth-child(3){animation-delay:.15s}.form-field:nth-child(4){animation-delay:.2s}.form-field:nth-child(5){animation-delay:.25s}.loading-skeleton{animation:fadeIn .3s ease-out}.skeleton-header{height:24px;width:60%;background:linear-gradient(90deg,#e0e0e0 25%,#f0f0f0,#e0e0e0 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:4px;margin-bottom:20px}.skeleton-text{height:16px;width:100%;background:linear-gradient(90deg,#e0e0e0 25%,#f0f0f0,#e0e0e0 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:4px;margin-bottom:12px}.skeleton-text.short{width:70%}.skeleton-options{display:flex;flex-direction:column;gap:10px;margin-top:20px}.skeleton-option{height:48px;background:linear-gradient(90deg,#e0e0e0 25%,#f0f0f0,#e0e0e0 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:8px}.skeleton-option:nth-child(1){animation-delay:0s}.skeleton-option:nth-child(2){animation-delay:.1s}.skeleton-option:nth-child(3){animation-delay:.2s}.skeleton-option:nth-child(4){animation-delay:.3s}.loading-spinner{display:inline-flex;align-items:center;gap:8px}.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(0,0,0,.2);border-top-color:#000;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.mode-switcher{display:flex;gap:10px;margin-bottom:20px;padding:10px;background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:12px;justify-content:center}.mode-btn{padding:12px 24px;border:2px solid transparent;background-color:#fff;color:#333;font-weight:600;border-radius:8px;cursor:pointer;transition:all .3s ease;font-size:1em}.mode-btn:hover{border-color:#646cff;transform:translateY(-2px)}.mode-btn.active{background:linear-gradient(135deg,#646cff,#5a5fd8);color:#fff;border-color:#646cff;box-shadow:0 4px 12px #646cff66}.item-bank-container{animation:fadeIn .5s ease-out;max-width:1200px;width:100%;margin:0 auto;padding:0 20px;box-sizing:border-box}.item-bank-container h2{margin-bottom:20px;color:#333}.filter-bar{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;background-color:#f8f9fa;border-radius:8px;margin-bottom:20px}.filter-bar label{display:flex;align-items:center;gap:10px;font-weight:500;color:#333}.filter-select{padding:8px 16px;border:1px solid #ddd;border-radius:6px;background-color:#fff;font-size:1em;cursor:pointer;min-width:150px}.filter-select:focus{border-color:#646cff;outline:none;box-shadow:0 0 0 3px #646cff33}.total-count{color:#666;font-size:.9em}.item-list{display:flex;flex-direction:column;gap:15px;margin-bottom:20px}.empty-state{text-align:center;padding:60px 20px;color:#999;font-size:1.2em}.item-card{background-color:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:15px 20px;cursor:pointer;transition:all .3s ease;animation:fadeIn .4s ease-out}.item-card:hover{border-color:#646cff;box-shadow:0 4px 16px #0000001a}.item-card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.item-card-badges{display:flex;gap:8px;flex-wrap:wrap}.badge{display:inline-block;padding:4px 10px;border-radius:4px;font-size:.8em;font-weight:600}.badge-id{background-color:#f0f0f0;color:#666}.badge-level{background-color:#f0f0f0;font-weight:700}.badge-section{background-color:#e6f7ff;color:#1890ff}.badge-status{font-size:.75em}.badge-status.active{background-color:#f6ffed;color:#52c41a}.badge-status.inactive{background-color:#fff1f0;color:#ff4d4f}.item-card-toggle{color:#999;font-size:.9em}.item-card-stem-preview{color:#333;font-size:.95em;line-height:1.5;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;text-align:left}.item-card-details{margin-top:20px;padding-top:20px;border-top:1px solid #e0e0e0;animation:fadeIn .3s ease-out;text-align:left}.audio-player-container{margin-bottom:20px;padding:15px;background-color:#f8f9fa;border-radius:12px;border:1px solid #e0e0e0}.audio-header{display:flex;align-items:center;gap:12px;margin-bottom:12px;color:#646cff}.audio-header strong{color:#333}.loading-text{font-size:.9em;color:#888}.audio-player{width:100%;border-radius:8px;outline:none}.audio-placeholder{height:54px;background-color:#e9ecef;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#888}.reading-material{margin-bottom:20px;padding:15px;background-color:#f8f9fa;border-radius:8px;border-left:4px solid #646cff}.reading-material strong{color:#333}.material-content{margin-top:10px;line-height:1.6;color:#333;white-space:pre-wrap}.item-stem{margin-bottom:20px}.item-stem h4{margin:0;font-size:1.1em;line-height:1.5;color:#333}.item-options{display:flex;flex-direction:column;gap:10px}.item-options.image-options{flex-direction:row;flex-wrap:wrap;justify-content:center}.option-item{display:flex;align-items:center;gap:12px;padding:12px 16px;background-color:#f8f9fa;border:1px solid #e0e0e0;border-radius:8px;transition:all .2s ease}.option-item.correct{background-color:#f6ffed;border-color:#52c41a}.option-key{font-weight:700;min-width:24px;color:#333}.option-text{flex:1;color:#333}.option-image{max-width:150px;max-height:100px;object-fit:contain;border-radius:4px}.correct-mark{color:#52c41a;font-weight:600;font-size:.9em;margin-left:auto}.item-meta{margin-top:15px;padding-top:15px;border-top:1px solid #e0e0e0;display:flex;align-items:center;gap:15px;flex-wrap:wrap}.item-meta a{color:#646cff;text-decoration:none}.item-meta a:hover{text-decoration:underline}.show-answer-btn{padding:8px 16px;background-color:#f5f5f5;color:#333;border:1px solid #ddd;border-radius:8px;cursor:pointer;font-size:.9em;font-weight:500;transition:all .3s ease}.show-answer-btn:hover{background-color:#e8e8e8;border-color:#646cff}.show-answer-btn.active{background-color:#646cff;color:#fff;border-color:#646cff}.pagination{display:flex;justify-content:center;align-items:center;gap:10px;margin-top:20px;padding:15px}.page-btn{padding:8px 16px;font-size:.9em}.page-info{padding:8px 16px;color:#333;font-weight:500}.loading-container{padding:20px 0}.skeleton-card{background-color:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:20px;margin-bottom:15px}.skeleton-card .skeleton-header{height:20px;width:40%;margin-bottom:15px}.skeleton-card .skeleton-text{height:16px;width:80%}