:root{--primary-color: #2f6fed;--primary-hover: #4d83f0;--primary-active: #1e5fd4;--primary-light: #eaf1fe;--primary-lighter: #f5f8ff;--text-primary: #1a1f2e;--text-secondary: #4a5163;--text-muted: #8b91a3;--border-color: #e2e5ec;--border-light: #eef0f5;--border-strong: #d4d8e0;--bg-primary: #ffffff;--bg-secondary: #f7f8fa;--bg-tertiary: #f0f2f7;--bg-hover: #f0f5ff;--shadow-xs: 0 1px 2px rgba(20, 30, 60, .04);--shadow-sm: 0 1px 3px rgba(20, 30, 60, .06), 0 1px 2px rgba(20, 30, 60, .04);--shadow-md: 0 4px 12px rgba(20, 30, 60, .08), 0 1px 3px rgba(20, 30, 60, .04);--shadow-lg: 0 12px 32px rgba(20, 30, 60, .12), 0 4px 8px rgba(20, 30, 60, .06);--radius-xs: 3px;--radius-sm: 5px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px}*{margin:0;padding:0;box-sizing:border-box}html{font-size:14px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft 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var(--border-light);background:none;cursor:pointer;padding:0;overflow:hidden;transition:all .25s cubic-bezier(.4,0,.2,1)}.brand-avatar-button:hover{transform:scale(1.08);border-color:var(--primary-light);box-shadow:0 0 0 4px var(--primary-lighter)}.brand-avatar-button.popping{animation:avatarPop .36s ease-out}@keyframes avatarPop{0%{transform:scale(1)}50%{transform:scale(1.3)}to{transform:scale(1)}}.brand-avatar{width:100%;height:100%;object-fit:cover}.brand-text{display:flex;flex-direction:column}.brand-name{font-size:16px;font-weight:700;color:var(--text-primary);line-height:1.2;letter-spacing:.3px}.brand-subtitle{font-size:12px;color:var(--text-muted);line-height:1.2}.nav-tabs{display:flex;gap:2px;background:var(--bg-tertiary);padding:3px;border-radius:var(--radius-md)}.nav-tab{padding:6px 18px;border:none;background:transparent;color:var(--text-secondary);font-size:13px;cursor:pointer;border-radius:var(--radius-sm);transition:all .2s cubic-bezier(.4,0,.2,1);font-weight:500}.nav-tab:hover{color:var(--primary-color)}.nav-tab.active{background:var(--bg-primary);color:var(--primary-color);box-shadow:var(--shadow-sm);font-weight:600}.nav-link{color:var(--text-muted);text-decoration:none;font-size:13px;transition:color .2s;padding:4px 8px;border-radius:var(--radius-sm)}.nav-link:hover{color:var(--primary-color);background:var(--primary-lighter)}.nav-btn{padding:7px 16px;border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-primary);font-size:13px;cursor:pointer;border-radius:var(--radius-sm);transition:all .2s cubic-bezier(.4,0,.2,1);font-family:inherit;font-weight:500}.nav-btn:hover{border-color:var(--primary-color);color:var(--primary-color);background:var(--primary-lighter)}.nav-btn:active{transform:translateY(.5px)}.nav-btn.primary{background:var(--primary-color);color:#fff;border-color:var(--primary-color);box-shadow:0 2px 6px 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var(--primary-light)}.picker-summary{display:flex;justify-content:space-between;align-items:center;padding:8px 0;font-size:12px;color:var(--text-muted);margin-bottom:8px}.picker-summary button{padding:3px 10px;border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-secondary);font-size:12px;cursor:pointer;border-radius:var(--radius-sm);font-family:inherit;transition:all .2s}.picker-summary button:hover{border-color:var(--primary-color);color:var(--primary-color)}.picker-check{width:14px;height:14px;border-radius:3px;border:1px solid var(--border-color);background:var(--bg-primary);display:inline-block;transition:all .15s}.picker-check.active{background:var(--primary-color);border-color:var(--primary-color)}.literacy-picker-layout{min-height:500px}.literacy-main{min-width:300px}.literacy-lesson-card{padding:10px 12px;margin-bottom:6px;border-radius:var(--radius-md);border:1px solid var(--border-light);background:var(--bg-primary);cursor:pointer;width:100%;text-align:left;transition:all .2s;font-family:inherit}.literacy-lesson-card:hover{border-color:var(--primary-color);background:var(--primary-lighter)}.literacy-lesson-card.active{background:var(--primary-light);border-color:var(--primary-color)}.literacy-lesson-head{display:flex;align-items:center;gap:8px;margin-bottom:6px}.literacy-lesson-head strong{font-size:13px;color:var(--text-primary)}.literacy-lesson-head span{font-size:11px;color:var(--text-muted)}.literacy-characters{font-size:14px;color:var(--text-secondary);line-height:1.8;word-break:break-all}.import-dedupe-toggle{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-secondary);cursor:pointer}.import-dedupe-toggle input{cursor:pointer}.icp-card{display:flex;align-items:center;gap:8px;padding:10px 12px;margin-top:auto;background:var(--bg-tertiary);border-radius:var(--radius-md);color:var(--text-muted);font-size:11px;text-decoration:none;transition:all .2s;flex-shrink:0}.icp-card:hover{background:var(--border-light);color:var(--text-secondary)}.icp-dot{width:6px;height:6px;border-radius:50%;background:#52c41a;box-shadow:0 0 4px #52c41a66}.update-notice{position:fixed;top:70px;right:20px;background:var(--bg-primary);border:1px solid var(--primary-color);border-radius:var(--radius-md);padding:12px 16px;box-shadow:var(--shadow-lg);z-index:1000;display:flex;align-items:center;gap:12px;font-size:13px}.update-notice button{padding:4px 12px;border:1px solid var(--primary-color);background:var(--primary-color);color:#fff;font-size:12px;cursor:pointer;border-radius:var(--radius-sm);font-family:inherit;font-weight:500}.update-notice button:last-child{background:var(--bg-primary);color:var(--primary-color)}.export-mode .pinyin-indicator{display:none!important}@media print{.top-nav,.left-panel,.right-panel,.mobile-section-tabs,.mobile-recommend-link{display:none!important}.preview-area{width:100%!important;padding:0!important}.paper-stack{transform:none!important;box-shadow:none!important}}@media (max-width: 1024px){.left-panel,.right-panel{display:none}.mobile-section-tabs{display:flex}.mobile-recommend-link{display:block}.nav-link{display:none}.mobile-panel-settings .left-panel{display:flex;width:100%;border-right:none}.mobile-panel-settings .preview-area,.mobile-panel-settings .right-panel{display:none}.mobile-panel-preview .preview-area{display:flex}.mobile-panel-preview .left-panel,.mobile-panel-preview .right-panel{display:none}.mobile-panel-input .right-panel{display:flex;width:100%;border-left:none}.mobile-panel-input .left-panel,.mobile-panel-input .preview-area{display:none}}@media (max-width: 640px){.top-nav{padding:0 12px;height:52px}.brand-name{font-size:14px}.nav-tabs{gap:2px;padding:2px}.nav-tab{padding:4px 10px;font-size:12px}.preview-area{padding:12px}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}