@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--primary-color: #6366f1;--primary-hover: #4f46e5;--primary-light: rgba(99, 102, 241, .1);--secondary-color: #ec4899;--secondary-hover: #db2777;--background-color: #f1f5f9;--surface-color: #ffffff;--surface-elevated: #ffffff;--text-primary: #0f172a;--text-secondary: #64748b;--text-muted: #94a3b8;--border-color: #e2e8f0;--error-color: #ef4444;--success-color: #22c55e;--warning-color: #f59e0b;--gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);--gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--gradient-card-overlay: linear-gradient( to top, rgba(0, 0, 0, .6) 0%, transparent 60% );--gradient-surface: linear-gradient(145deg, #ffffff 0%, #f8faff 100%);--font-family: "Inter", system-ui, -apple-system, sans-serif;--font-size-base: 16px;--line-height-base: 1.6;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08), 0 2px 4px rgba(0, 0, 0, .04);--shadow-lg: 0 10px 30px rgba(0, 0, 0, .1), 0 4px 8px rgba(0, 0, 0, .06);--shadow-xl: 0 20px 40px rgba(0, 0, 0, .12), 0 8px 16px rgba(0, 0, 0, .08);--shadow-primary: 0 4px 14px rgba(99, 102, 241, .35);--radius-sm: .375rem;--radius-md: .625rem;--radius-lg: 1rem;--radius-xl: 1.5rem;--radius-full: 9999px;font-family:var(--font-family);line-height:var(--line-height-base);font-weight:400;color-scheme:light;color:var(--text-primary);background-color:var(--background-color);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box;margin:0;padding:0}body{min-width:320px;min-height:100vh;background-color:var(--background-color);background-image:radial-gradient(ellipse at 20% 50%,rgba(99,102,241,.05) 0%,transparent 50%),radial-gradient(ellipse at 80% 20%,rgba(139,92,246,.05) 0%,transparent 50%)}h1,h2,h3,h4,h5,h6{line-height:1.2;font-weight:700;color:var(--text-primary);letter-spacing:-.02em}a{font-weight:500;color:var(--primary-color);text-decoration:none;transition:color .2s}a:hover{color:var(--primary-hover)}button{border-radius:var(--radius-md);border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:600;font-family:inherit;background-color:var(--surface-color);cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);color:var(--text-primary);box-shadow:var(--shadow-sm)}button:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}button:active{transform:translateY(0)}button:focus,button:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-primary);border:none}.btn-primary:hover{filter:brightness(1.1);box-shadow:0 6px 20px #6366f173}.btn-danger{background-color:var(--error-color);color:#fff;border:none}.btn-danger:hover{background-color:#dc2626}.container{max-width:1280px;margin:0 auto;padding:var(--spacing-xl) var(--spacing-lg)}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);padding-bottom:var(--spacing-lg);border-bottom:2px solid var(--border-color)}.page-header h2{font-size:2rem;font-weight:800;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--spacing-xl);padding:var(--spacing-md) 0}.topic-card,.lesson-card,.activity-card{background:var(--gradient-surface);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);overflow:hidden;transition:transform .3s cubic-bezier(.4,0,.2,1),box-shadow .3s;cursor:pointer;display:flex;flex-direction:column;border:1px solid rgba(255,255,255,.8);position:relative}.topic-card:hover,.lesson-card:hover,.activity-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-xl)}.card-image-wrapper{position:relative;height:180px;overflow:hidden;background:linear-gradient(135deg,#e0e7ff,#ede9fe)}.card-image-wrapper:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:var(--gradient-card-overlay);opacity:0;transition:opacity .3s}.topic-card:hover .card-image-wrapper:after,.lesson-card:hover .card-image-wrapper:after{opacity:1}.topic-image,.lesson-image{width:100%;height:100%;object-fit:cover;transition:transform .4s cubic-bezier(.4,0,.2,1)}.topic-card:hover .topic-image,.lesson-card:hover .lesson-image{transform:scale(1.08)}.card-badge{position:absolute;top:var(--spacing-sm);left:var(--spacing-sm);background:#ffffffe6;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);padding:3px 10px;border-radius:var(--radius-full);font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--primary-color);box-shadow:var(--shadow-sm);z-index:1}.card-content{padding:var(--spacing-lg);flex-grow:1;display:flex;flex-direction:column;gap:var(--spacing-xs)}.card-title{font-size:1.1rem;font-weight:700;color:var(--text-primary);margin:0;line-height:1.3}.card-description{font-size:.875rem;color:var(--text-secondary);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-top:2px}.card-actions{display:flex;gap:var(--spacing-xs);flex-wrap:wrap;margin-top:var(--spacing-sm);padding-top:var(--spacing-sm);border-top:1px solid var(--border-color)}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;padding:0;border-radius:var(--radius-md);background-color:var(--background-color);color:var(--text-secondary);transition:all .2s;border:1px solid var(--border-color);box-shadow:none;flex-shrink:0}.icon-button:hover{transform:translateY(-1px);box-shadow:var(--shadow-sm)}.sequence-button:hover{background-color:var(--primary-light);color:var(--primary-color);border-color:var(--primary-color)}.edit-button:hover{background-color:var(--primary-color);color:#fff;border-color:var(--primary-color)}.clone-button:hover{background-color:var(--success-color);color:#fff;border-color:var(--success-color)}.delete-button:hover{background-color:var(--error-color);color:#fff;border-color:var(--error-color)}.form-group{margin-bottom:var(--spacing-md);display:flex;flex-direction:column;gap:6px}.form-group label{font-size:.875rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em}.modal-input{width:100%;padding:.7rem var(--spacing-md);border:1.5px solid var(--border-color);border-radius:var(--radius-md);font-size:1rem;font-family:inherit;transition:border-color .2s,box-shadow .2s;background-color:var(--surface-color);color:var(--text-primary)}.modal-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #6366f11f}input[type=text],input[type=number],textarea,select{width:100%;padding:.75rem var(--spacing-md);border:1.5px solid var(--border-color);border-radius:var(--radius-md);font-size:1rem;font-family:inherit;transition:border-color .2s,box-shadow .2s;background-color:var(--surface-color)}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #6366f11f}.cancel-button{background-color:transparent;color:var(--text-secondary);border:1.5px solid var(--border-color);box-shadow:none}.cancel-button:hover{background-color:var(--background-color);color:var(--text-primary);border-color:var(--text-secondary)}.activity-type-badge{display:inline-block;background:var(--gradient-primary);color:#fff;padding:4px 12px;border-radius:var(--radius-full);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em}.empty-state{grid-column:1 / -1;text-align:center;padding:var(--spacing-2xl);color:var(--text-muted)}.empty-state-icon{font-size:3rem;margin-bottom:var(--spacing-md)}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}.logo{height:6em;padding:1.5em;will-change:filter;transition:filter .3s}.logo:hover{filter:drop-shadow(0 0 2em #646cffaa)}.logo.react:hover{filter:drop-shadow(0 0 2em #61dafbaa)}@keyframes logo-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media (prefers-reduced-motion: no-preference){a:nth-of-type(2) .logo{animation:logo-spin infinite 20s linear}}.card{padding:2em}.read-the-docs{color:#888}.lesson-page{padding:var(--spacing-xl)}.lesson-image{width:100%;height:100%;object-fit:cover;transition:transform .4s cubic-bezier(.4,0,.2,1)}.lesson-card:hover .lesson-image{transform:scale(1.08)}.lesson-placeholder{height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:.5rem;background:linear-gradient(135deg,#e0e7ff,#ede9fe);color:var(--text-secondary);font-weight:500;font-size:2rem}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#0f172a99;display:flex;align-items:center;justify-content:center;z-index:1000;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);animation:fadeIn .2s ease-out;padding:var(--spacing-md)}.modal-content{background:var(--gradient-surface);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl),0 0 0 1px #ffffff80 inset;width:100%;max-width:520px;max-height:92vh;overflow-y:auto;display:flex;flex-direction:column;animation:slideIn .3s cubic-bezier(.34,1.56,.64,1)}.modal-header{padding:var(--spacing-lg) var(--spacing-xl);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-md)}.modal-header h3{margin:0;font-size:1.25rem;font-weight:700;color:var(--text-primary);letter-spacing:-.02em}.modal-close{background:var(--background-color);border:1px solid var(--border-color);border-radius:var(--radius-md);width:32px;height:32px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;color:var(--text-secondary);cursor:pointer;padding:0;box-shadow:none;flex-shrink:0;transition:all .2s}.modal-close:hover{background:var(--error-color);color:#fff;border-color:var(--error-color);transform:none;box-shadow:none}.modal-body{padding:var(--spacing-xl);color:var(--text-primary);display:flex;flex-direction:column;gap:var(--spacing-md)}.modal-footer{padding:var(--spacing-md) var(--spacing-xl);border-top:1px solid var(--border-color);display:flex;justify-content:flex-end;gap:var(--spacing-sm);background:var(--background-color);border-bottom-left-radius:var(--radius-xl);border-bottom-right-radius:var(--radius-xl)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideIn{0%{transform:translateY(-24px) scale(.96);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}.image-fallback-container{display:flex;align-items:center;justify-content:center;background-color:var(--background-color, #f3f4f6);color:var(--text-secondary, #6b7280);width:100%;height:100%;font-size:.875rem;font-weight:500;text-align:center;padding:.5rem}.activity-page{padding:var(--spacing-xl)}.activity-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--spacing-xl);padding:var(--spacing-md) 0}.activity-card{background:var(--gradient-surface);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);overflow:hidden;transition:transform .3s cubic-bezier(.4,0,.2,1),box-shadow .3s;cursor:pointer;display:flex;flex-direction:column;border:1px solid rgba(255,255,255,.8);position:relative}.activity-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-xl)}.activity-card-banner{height:6px;width:100%;background:var(--gradient-primary);transition:height .2s}.activity-card:hover .activity-card-banner{height:8px}.activity-card-banner.type-story{background:linear-gradient(90deg,#6366f1,#8b5cf6)}.activity-card-banner.type-image_verify{background:linear-gradient(90deg,#0ea5e9,#06b6d4)}.activity-card-banner.type-trace{background:linear-gradient(90deg,#f59e0b,#ef4444)}.activity-card-banner.type-option{background:linear-gradient(90deg,#22c55e,#10b981)}.activity-card-banner.type-audio{background:linear-gradient(90deg,#ec4899,#db2777)}.activity-card-banner.type-page_template{background:linear-gradient(90deg,#8b5cf6,#7c3aed)}.activity-card-body{padding:var(--spacing-lg);display:flex;flex-direction:column;flex-grow:1;gap:var(--spacing-md)}.activity-card-top{display:flex;align-items:center;gap:var(--spacing-md)}.activity-type-icon{width:52px;height:52px;border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;font-size:1.5rem;flex-shrink:0;background:var(--primary-light)}.activity-type-icon.type-story{background:#6366f11f}.activity-type-icon.type-image_verify{background:#0ea5e91f}.activity-type-icon.type-trace{background:#f59e0b1f}.activity-type-icon.type-option{background:#22c55e1f}.activity-type-icon.type-audio{background:#ec48991f}.activity-type-icon.type-page_template{background:#8b5cf61f}.activity-card-info{flex:1;min-width:0}.activity-card-name{font-size:1rem;font-weight:700;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.activity-type-pill{display:inline-block;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--text-secondary);margin-top:2px}.activity-card-meta{display:flex;align-items:center;gap:var(--spacing-sm);font-size:.8rem;color:var(--text-muted);padding:var(--spacing-xs) var(--spacing-sm);background:var(--background-color);border-radius:var(--radius-md)}.activity-card-actions{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-sm) var(--spacing-lg);border-top:1px solid var(--border-color);background:#f8fafc80}.activity-card-actions .action-group{display:flex;gap:var(--spacing-xs)}.type-picker-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-sm);margin-top:var(--spacing-xs)}.type-option-card{display:flex;flex-direction:column;align-items:center;gap:6px;padding:var(--spacing-md) var(--spacing-sm);border:2px solid var(--border-color);border-radius:var(--radius-lg);cursor:pointer;transition:all .2s;background:var(--surface-color);font-size:.8rem;font-weight:600;color:var(--text-secondary);box-shadow:none}.type-option-card:hover{border-color:var(--primary-color);color:var(--primary-color);background:var(--primary-light);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.type-option-card.selected{border-color:var(--primary-color);background:var(--primary-light);color:var(--primary-color);box-shadow:0 0 0 3px #6366f126}.type-option-icon{font-size:1.5rem}.activity-empty{grid-column:1 / -1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl);text-align:center;color:var(--text-muted);gap:var(--spacing-md)}.activity-empty-icon{font-size:3.5rem;opacity:.6}.activity-empty h3{font-size:1.25rem;color:var(--text-secondary);font-weight:600}.activity-empty p{font-size:.95rem}.activity-edit-page{padding:var(--spacing-xl);max-width:1000px;margin:0 auto}.activity-edit-page h2{font-size:2rem;color:var(--text-primary);margin-bottom:var(--spacing-xl);text-align:center}.form{display:flex;flex-direction:column;gap:var(--spacing-lg);background-color:var(--surface-color);padding:var(--spacing-xl);border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}label{display:block;font-weight:500;font-size:.9rem;color:var(--text-secondary);margin-bottom:var(--spacing-xs)}.activity-input,.activity-textarea,select,input[type=text],input[type=number],textarea{width:100%;padding:var(--spacing-sm) var(--spacing-md);font-size:1rem;border:1px solid var(--border-color);border-radius:var(--radius-md);background-color:var(--background-color);color:var(--text-primary);transition:border-color .2s,box-shadow .2s;font-family:inherit}.activity-input:focus,.activity-textarea:focus,select:focus,input[type=text]:focus,input[type=number]:focus,textarea:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #6366f11a}.activity-input.read-only{background-color:var(--background-color);color:var(--text-secondary);cursor:not-allowed}textarea{resize:vertical;min-height:120px}.config-editor-container{display:flex;flex-direction:column;gap:var(--spacing-lg);padding:var(--spacing-lg);background-color:var(--background-color);border-radius:var(--radius-md);border:1px solid var(--border-color)}.config-editor-container h3{font-size:1.25rem;margin-bottom:var(--spacing-md);color:var(--text-primary);border-bottom:2px solid var(--primary-color);padding-bottom:var(--spacing-xs);display:inline-block}.slide-container{padding:var(--spacing-lg);border:1px solid var(--border-color);border-radius:var(--radius-md);background-color:var(--surface-color);margin-bottom:var(--spacing-md)}.slide-container h4{font-size:1.1rem;margin-bottom:var(--spacing-md);color:var(--text-primary);display:flex;justify-content:space-between;align-items:center}.slide-content{display:flex;flex-direction:column;gap:var(--spacing-md)}.story-item{display:flex;flex-direction:column;gap:var(--spacing-md);padding:var(--spacing-md);border-radius:var(--radius-md);background-color:var(--background-color);border:1px solid var(--border-color)}.dropdown{width:100%;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);border:1px solid var(--border-color);background-color:var(--surface-color)}.file-upload{padding:var(--spacing-sm) 0;font-size:.9rem}.preview-image{max-width:100%;max-height:200px;object-fit:contain;border-radius:var(--radius-md);border:1px solid var(--border-color);margin-top:var(--spacing-sm)}.save-button{padding:var(--spacing-md) var(--spacing-xl);font-size:1rem;font-weight:600;background-color:var(--primary-color);color:#fff;border:none;border-radius:var(--radius-md);cursor:pointer;transition:background-color .2s;align-self:flex-end}.save-button:hover{background-color:var(--primary-hover)}.add-button,.add-option{padding:var(--spacing-sm) var(--spacing-md);font-size:.9rem;font-weight:500;background-color:var(--secondary-color);color:#fff;border:none;border-radius:var(--radius-md);cursor:pointer;transition:background-color .2s;width:fit-content}.add-button:hover,.add-option:hover{filter:brightness(1.1)}.remove-button,.remove-option{padding:var(--spacing-xs) var(--spacing-sm);font-size:.8rem;font-weight:500;background-color:transparent;color:var(--error-color);border:1px solid var(--error-color);border-radius:var(--radius-md);cursor:pointer;transition:all .2s}.remove-button:hover,.remove-option:hover{background-color:var(--error-color);color:#fff}.question-container,.options-container{display:flex;flex-direction:column;gap:var(--spacing-lg)}.question-item,.option-item{display:flex;flex-direction:column;gap:var(--spacing-md);padding:var(--spacing-md);border-radius:var(--radius-md);background-color:var(--surface-color);border:1px solid var(--border-color)}.option-content{display:flex;flex-direction:column;gap:var(--spacing-md);padding:var(--spacing-md);border-radius:var(--radius-md);background-color:var(--background-color);border:1px solid var(--border-color)}.correct-option{margin-top:var(--spacing-lg);padding-top:var(--spacing-lg);border-top:1px solid var(--border-color)}.audio-uploader-container{display:flex;flex-direction:column;gap:10px;border:1px solid #ddd;padding:10px;border-radius:6px;background-color:#f9f9f9}.uploader-tabs{display:flex;justify-content:space-around;margin-bottom:10px;border-bottom:1px solid #eee}.uploader-tab{padding:8px 16px;cursor:pointer;border:none;background:none;font-weight:500;color:#666}.uploader-tab.active{color:#007bff;border-bottom:2px solid #007bff}.uploader-content{display:flex;flex-direction:column;gap:8px}.audio-preview{margin-top:10px}.generate-button{background-color:#007bff;color:#fff;border:none;padding:8px 12px;border-radius:4px;cursor:pointer}.generate-button:disabled{background-color:#ccc;cursor:not-allowed}.voice-selection{display:flex;flex-direction:column;gap:4px}.voice-dropdown{padding:6px;border-radius:4px;border:1px solid #ccc;width:100%}.topic-page{padding:var(--spacing-xl)}.topic-image{width:100%;height:100%;object-fit:cover;transition:transform .4s cubic-bezier(.4,0,.2,1)}.topic-card:hover .topic-image{transform:scale(1.08)}.topic-placeholder{height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:.5rem;background:linear-gradient(135deg,#e0e7ff,#ede9fe);color:var(--text-secondary);font-weight:500;font-size:2rem}.language-filter{display:flex;align-items:center;gap:var(--spacing-sm)}.language-filter label{font-size:.875rem;font-weight:600;color:var(--text-secondary);white-space:nowrap}.language-filter select{padding:.45rem var(--spacing-md);border-radius:var(--radius-md);border:1.5px solid var(--border-color);background:var(--surface-color);font-size:.9rem;color:var(--text-primary);font-family:inherit;cursor:pointer;min-width:150px}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background-image:linear-gradient(135deg,#667eea,#764ba2);padding:var(--spacing-md);position:relative;overflow:hidden}.login-page:before{content:"";position:absolute;width:600px;height:600px;background:#ffffff0f;border-radius:50%;top:-200px;right:-200px}.login-page:after{content:"";position:absolute;width:400px;height:400px;background:#ffffff0a;border-radius:50%;bottom:-150px;left:-150px}.login-container{display:flex;flex-direction:column;align-items:center;padding:var(--spacing-2xl) var(--spacing-xl);background:#fffffff2;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-radius:var(--radius-xl);box-shadow:0 25px 50px #00000040;max-width:420px;width:100%;text-align:center;border:1px solid rgba(255,255,255,.5);z-index:1}.login-logo{width:64px;height:64px;background:var(--gradient-primary);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;margin-bottom:var(--spacing-lg);box-shadow:var(--shadow-primary);font-size:1.75rem}.login-container h1{font-size:2rem;font-weight:800;color:var(--text-primary);margin-bottom:var(--spacing-xs);letter-spacing:-.03em}.login-subtitle{font-size:.95rem;color:var(--text-secondary);margin-bottom:var(--spacing-xl);line-height:1.6}.google-button{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);background-color:var(--surface-color);color:var(--text-primary);padding:var(--spacing-md) var(--spacing-lg);border:1.5px solid var(--border-color);border-radius:var(--radius-md);font-size:1rem;font-weight:600;font-family:inherit;cursor:pointer;transition:all .2s;width:100%;box-shadow:var(--shadow-sm)}.google-button:hover{background-color:#f8f9fa;border-color:#dadce0;box-shadow:var(--shadow-md);transform:translateY(-1px)}.google-logo{width:20px;height:20px;flex-shrink:0}