:root{--primary: #238636;--primary-hover: #2ea043;--primary-light: #7ee787;--danger: #da3633;--danger-hover: #f85149;--danger-light: #ffa198;--info: #58a6ff;--info-hover: #79c0ff;--info-dark: #1f6feb;--bg-primary: #0d1117;--bg-secondary: #161b22;--bg-tertiary: #21262d;--bg-hover: #1c2128;--border-primary: #30363d;--border-hover: #484f58;--border-focus: #58a6ff;--text-primary: #e6edf3;--text-secondary: #c9d1d9;--text-muted: #7d8590;--text-disabled: #484f58;--success-bg: #1b2e1f;--success-text: #7ee787;--success-border: #238636;--error-bg: #2d1519;--error-text: #ffa198;--error-border: #da3633;--info-bg: #1c2d41;--info-text: #79c0ff;--info-border: #58a6ff;--radius-sm: 4px;--radius-md: 2px;--radius-lg: 4px;--space-xs: 4px;--space-sm: 6px;--space-md: 8px;--space-lg: 12px;--space-xl: 16px;--btn-padding: 6px 12px;--btn-font-size: 13px;--btn-font-weight: 500;--btn-border-radius: var(--radius-md);--btn-transition: all .2s ease;--input-padding: 4px 6px;--input-font-size: 13px;--input-border-radius: var(--radius-sm);--input-border: 1px solid var(--border-primary);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--shadow-focus: 0 0 0 3px rgba(88, 166, 255, .15)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.4;padding:var(--space-lg)}body::-webkit-scrollbar{width:8px}body::-webkit-scrollbar-track{background:var(--bg-primary)}body::-webkit-scrollbar-thumb{background:var(--border-primary);border-radius:4px}body::-webkit-scrollbar-thumb:hover{background:var(--border-hover)}.container{max-width:1600px;margin:0 auto}.section{display:grid;gap:var(--space-lg);margin-bottom:var(--space-xl)}.upload-preview{grid-template-columns:1fr 1fr}.frame-live-row{display:grid;grid-template-columns:2fr 1fr;gap:var(--space-lg)}.card{background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:14px;display:flex;flex-direction:column;box-shadow:var(--shadow-sm)}h1{font-size:20px;font-weight:600;color:var(--text-primary);text-align:start}h2{font-size:20px;font-weight:600;color:var(--text-primary)}h3{font-size:14px;font-weight:600;margin-bottom:var(--space-sm);color:#8b949e}p{color:var(--text-muted);text-align:start;margin-top:var(--space-lg);margin-bottom:10px;font-size:var(--btn-font-size)}.upload-area{border:2px dashed var(--border-primary);border-radius:var(--radius-md);padding:14px;text-align:center;background:var(--bg-primary);margin-bottom:var(--space-lg);transition:var(--btn-transition);font-size:var(--btn-font-size)}.upload-area:hover{border-color:var(--border-focus);background:var(--bg-secondary)}.upload-area.dragover{border-color:var(--border-focus);background:var(--bg-hover)}.upload-buttons-container{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-md);margin-bottom:var(--space-md)}.upload-button-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-md);margin-top:var(--space-md)}.upload-button{width:100%;margin:0!important}.file-info{font-size:11px;color:var(--text-primary);margin:var(--space-xs) 0;padding:3px var(--space-sm);background:var(--bg-tertiary);border-radius:var(--radius-sm);display:inline-block}input[type=file]{margin:var(--space-sm) 0;padding:var(--input-padding);border:var(--input-border);border-radius:var(--input-border-radius);width:100%;max-width:280px;font-size:var(--input-font-size);background:var(--bg-primary);color:var(--text-primary)}input[type=file]:focus{outline:none;border-color:var(--border-focus);box-shadow:var(--shadow-focus)}button{background:var(--primary);color:#fff;border:none;padding:var(--btn-padding);border-radius:var(--btn-border-radius);cursor:pointer;font-size:var(--btn-font-size);font-weight:var(--btn-font-weight);margin:3px;transition:var(--btn-transition)}button:hover:not(:disabled){background:var(--primary-hover)}button:disabled{background:var(--bg-tertiary);color:var(--text-disabled);cursor:not-allowed}.clear-btn{background:var(--danger)}.clear-btn:hover:not(:disabled){background:var(--danger-hover)}.progress-bar{width:100%;height:4px;background:var(--bg-tertiary);border-radius:2px;overflow:hidden;margin:var(--space-md) 0}.progress-fill{height:100%;background:var(--info);width:0%;transition:width .3s ease}.preview-container{height:100%;min-height:200px;flex:1;display:flex;align-items:center;justify-content:center;border:1px solid var(--border-primary);border-radius:var(--radius-md);background:var(--bg-primary);overflow:hidden;position:relative;cursor:crosshair}.preview-container img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;transition:transform .1s ease;transform-origin:0 0;position:relative}.preview-placeholder{color:var(--text-muted);font-style:italic;font-size:var(--btn-font-size)}.info{background:var(--info-bg);padding:var(--space-md);border-radius:var(--radius-md);border-left:3px solid var(--info-border);margin-bottom:var(--space-md);font-size:var(--btn-font-size);color:var(--info-text)}.error{background:var(--error-bg);color:var(--error-text);padding:var(--space-md);border-radius:var(--radius-md);border-left:3px solid var(--error-border);margin:var(--space-md) 0;font-size:var(--btn-font-size)}.success{background:var(--success-bg);color:var(--success-text);padding:var(--space-md);border-radius:var(--radius-md);border-left:3px solid var(--success-border);margin:var(--space-md) 0;font-size:var(--btn-font-size)}.download-section{text-align:center;padding:10px;background:var(--bg-primary);border-radius:var(--radius-md);margin:var(--space-md) 0;border:1px solid var(--border-primary)}.download-btn{background:var(--primary);margin:2px;padding:var(--space-sm) 10px}.download-btn:hover:not(:disabled){background:var(--primary-hover)}.download-btn:disabled{background:var(--bg-tertiary);color:var(--text-disabled);cursor:not-allowed}.gif-dropdown-container{display:inline-block;position:relative;margin:2px}.gif-main-btn{display:flex;align-items:center;gap:var(--space-sm);position:relative;justify-content:center}.gif-fps-label{font-size:11px;opacity:.75;font-weight:400}.gif-dropdown-menu{display:none;position:absolute;top:calc(100% + 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var(--border-primary)}.editor-controls{display:flex;justify-content:space-between;align-items:center;padding:8px;background:#0d1117;border-radius:6px;margin:8px 0;flex-wrap:wrap;gap:6px;border:1px solid #30363d}.control-group{display:flex;gap:4px;align-items:center}.action-btn{background:#30363d;padding:4px 8px;font-size:12px;margin:0;color:#e6edf3}.action-btn:hover:not(:disabled){background:#484f58}.action-btn.delete{background:#da3633}.action-btn.delete:hover:not(:disabled){background:#f85149}.action-btn.restore{background:#238636}.action-btn.restore:hover:not(:disabled){background:#2ea043}.action-btn.undo{background:#1f6feb}.action-btn.undo:hover:not(:disabled){background:#58a6ff}.keyboard-help{font-size:11px;color:#7d8590;background:#161b22;padding:4px 8px;border-radius:4px;border:1px solid #30363d}.frame-grid{display:grid;grid-template-columns:repeat(17,1fr);gap:1px;padding:8px;border:1px solid #30363d;border-radius:6px;background:#0d1117;outline:none;margin:8px 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.frame-cell-sprite{opacity:1}@media(max-width:1200px){.upload-preview{grid-template-columns:1fr}.frame-grid{grid-template-columns:repeat(12,1fr);max-height:380px}.preview-container{min-height:150px}.frame-cell{min-height:60px}}@media(max-width:768px){body{padding:8px}.card{padding:12px}.frame-grid{grid-template-columns:repeat(8,1fr)}h1{font-size:20px}.editor-controls{flex-direction:column}.preview-container{min-height:120px}.frame-cell{min-height:50px}}.frame-grid::-webkit-scrollbar{width:6px}.frame-grid::-webkit-scrollbar-track{background:#0d1117}.frame-grid::-webkit-scrollbar-thumb{background:#30363d;border-radius:3px}.custom-file-upload{border:1px solid var(--border-primary);display:inline-block;padding:var(--btn-padding);cursor:pointer;background-color:var(--bg-tertiary);color:var(--text-secondary);border-radius:var(--btn-border-radius);margin:5px;font-size:var(--btn-font-size);font-weight:var(--btn-font-weight);transition:var(--btn-transition);min-width:120px;text-align:center}.custom-file-upload.upload-button{margin:0;width:100%}.custom-file-upload:hover{background-color:var(--border-primary)}.frame-grid::-webkit-scrollbar-thumb:hover{background:#484f58}.json-converter-section{margin-bottom:12px}.json-upload-area{border:2px dashed #30363d;border-radius:6px;padding:10px 16px;text-align:center;background:#0d1117;cursor:pointer;transition:all .3s ease;margin:8px 0}.json-upload-area:hover{border-color:#58a6ff;background:#161b22}.json-upload-area.dragover{border-color:#48bb78;background:#1c2128;transform:scale(1.01)}.json-converter-status{margin:8px 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16px;border-radius:6px;cursor:pointer;font-size:13px;font-weight:500;transition:none}.json-reset-link{text-align:center;margin-top:12px;padding-top:12px;border-top:1px solid #30363d}.json-reset-link a{color:#7d8590;font-size:12px;text-decoration:underline;cursor:pointer;transition:color .2s}.json-reset-link a:hover{color:#e6edf3}.upload-icon{font-size:2.5em;margin-bottom:10px;display:block}.json-converter-btn{background:#1f6feb;color:#fff;border:none;padding:8px 20px;border-radius:6px;font-size:13px;font-weight:600;cursor:pointer;transition:background .2s;margin-top:10px}.json-converter-btn:hover{background:#58a6ff}.json-converter-result{margin-top:8px}.json-converter-container{display:flex;gap:12px;align-items:stretch;flex-wrap:wrap}.help-btn{width:24px;height:24px;border-radius:50%;background:transparent;color:var(--text-muted);font-size:14px;font-weight:600;display:flex;align-items:center;justify-content:center;cursor:pointer;border:1px solid var(--border-primary);transition:all .2s ease;flex-shrink:0;margin:0;padding:0}.help-btn:hover{background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--border-hover)}.modal{display:none;position:fixed;z-index:10000;left:0;top:0;width:100%;height:100%;background-color:#000000b3;animation:fadeIn .2s ease}.modal.show{display:flex;align-items:center;justify-content:center}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-content{background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-lg);width:90%;max-width:800px;max-height:85vh;display:flex;flex-direction:column;animation:slideIn .3s cubic-bezier(.16,1,.3,1);box-shadow:0 20px 60px #00000080}@keyframes slideIn{0%{transform:translateY(-20px) scale(.95);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:var(--space-lg);border-bottom:1px solid var(--border-primary)}.modal-header 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