:root{--bg-base: #fcfcfc;--bg-elevated: #ffffff;--bg-input: #f3f3f3;--bg-hover: #f5f5f7;--border-base: #e3e3e3;--border-light: #f3f3f3;--text-primary: #333333;--text-secondary: #818181;--text-muted: #aaaaaa;--primary-blue: #409eff;--primary-gray: #5b5b5b;--danger: #ff4444;--shadow-panel: 0 10px 32px rgba(51, 51, 51, .12)}*{box-sizing:border-box}html,body{width:100%;min-height:100%;margin:0;background:var(--bg-base);color:var(--text-primary);font-family:Segoe UI,Noto Sans SC,Noto Sans Arabic,-apple-system,BlinkMacSystemFont,sans-serif}button,input,textarea{font:inherit}button{cursor:pointer}.page-shell{min-height:100vh;padding:24px}.topbar{display:flex;align-items:center;justify-content:center;position:relative;min-height:72px;margin-bottom:20px}.back-link{position:absolute;left:0;color:var(--primary-blue);font-size:13px;text-decoration:none}.back-link:hover{text-decoration:underline}.title-block{text-align:center}.title-block h1{margin:0 0 8px;font-size:24px;line-height:1.2}.title-block p{margin:0;color:var(--text-secondary);font-size:13px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:20px;align-items:start}.preview-panel,.panel-card{background:var(--bg-elevated);border:1px solid var(--border-base);border-radius:16px;box-shadow:var(--shadow-panel)}.preview-panel{min-width:0;padding:16px}.tabs{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:12px}.tabs--language{margin-bottom:20px}.tab-btn{min-width:72px;height:32px;padding:0 12px;border:1px solid var(--border-light);border-radius:8px;background:var(--bg-elevated);color:var(--text-primary);font-size:13px;transition:all .2s ease}.tab-btn:hover{background:var(--bg-hover);border-color:var(--border-base)}.tab-btn.is-active{background:var(--primary-gray);border-color:var(--primary-gray);color:#fff}.canvas-grid{display:grid;grid-template-columns:minmax(260px,420px) minmax(240px,1fr);gap:16px;align-items:start}.canvas-card{padding:12px;border:1px solid var(--border-light);border-radius:12px;background:#fbfbfb}.canvas-card--large{grid-row:span 3}.canvas-card__title{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px;color:var(--text-secondary);font-size:12px}.canvas-card__size{color:var(--text-muted)}.canvas-frame{display:flex;align-items:center;justify-content:center;min-height:120px;overflow:hidden;border-radius:8px;background:linear-gradient(45deg,#f3f3f3 25%,transparent 25%),linear-gradient(-45deg,#f3f3f3 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#f3f3f3 75%),linear-gradient(-45deg,transparent 75%,#f3f3f3 75%);background-color:#fff;background-position:0 0,0 8px,8px -8px,-8px 0;background-size:16px 16px}.canvas-frame canvas{display:block;max-width:100%;height:auto}.control-panel{position:sticky;top:24px}.panel-card{padding:20px}.panel-card h2{margin:0 0 8px;font-size:18px}.hint{margin:0 0 20px;color:var(--text-secondary);font-size:12px;line-height:1.6}.form-group{display:flex;flex-direction:column;gap:8px;margin-bottom:18px}.form-group label{font-size:13px;font-weight:600}.upload-row,.font-size-row,.editor-heading,.editor-actions,.placement-size-row{display:flex;align-items:center;gap:8px}.toggle-row{display:flex;align-items:center;gap:6px;color:var(--text-secondary);font-size:12px;font-weight:400}.btn-primary,.btn-secondary,.download-btn,.square-btn{border-radius:8px;transition:all .2s ease}.btn-primary,.btn-secondary{height:36px;padding:0 14px;font-size:13px}.btn-primary{border:1px solid var(--border-base);background:#fff;color:var(--text-primary)}.btn-primary:hover{background:var(--bg-hover)}.btn-secondary{border:1px solid var(--primary-gray);background:var(--primary-gray);color:#fff}.btn-secondary:hover{background:#6b6b6b}.text-input{width:100%;border:2px solid var(--bg-input);border-radius:12px;background:var(--bg-input);color:var(--text-primary);outline:none;transition:all .2s ease}input.text-input{height:44px;padding:0 14px}.select-input{height:40px;padding:0 12px}.textarea-input{min-height:132px;padding:12px 14px;resize:vertical;line-height:1.5}.text-input:hover,.text-input:focus{border-color:var(--text-primary);background:#fff}.square-btn{width:36px;height:36px;border:1px solid var(--border-base);background:#fff;color:var(--text-primary);font-size:20px;line-height:1}.square-btn:hover{background:var(--bg-hover)}.font-size-value{min-width:68px;color:var(--text-secondary);font-weight:600;text-align:center}.placement-editor{padding:14px;border:1px solid var(--border-light);border-radius:12px;background:#fbfbfb}.editor-heading{justify-content:space-between;width:100%;padding:0;border:none;background:transparent;color:var(--text-primary);font-weight:600;text-align:left}.editor-toggle-icon{color:var(--text-secondary);font-size:12px;font-weight:400}.placement-editor-body{display:flex;flex-direction:column;gap:8px;margin-top:12px}.placement-editor.is-collapsed{margin-bottom:18px}.placement-editor.is-collapsed .placement-editor-body{display:none}.editor-actions,.placement-size-row{flex-wrap:wrap}.placement-size-label{min-width:48px;color:var(--text-secondary);font-size:12px}.placement-output{width:100%;min-height:112px;padding:10px 12px;border:1px solid var(--border-base);border-radius:8px;background:#fff;color:var(--text-secondary);font-family:Consolas,Courier New,monospace;font-size:12px;line-height:1.5;resize:vertical}.hint--compact{margin:0}.download-btn{width:100%;height:44px;border:1px solid var(--primary-gray);background:var(--primary-gray);color:#fff;font-size:14px}.download-btn:hover{background:#333}.status-message{min-height:20px;margin-top:12px;color:var(--text-secondary);font-size:12px;line-height:1.6}.status-message.is-error{color:var(--danger)}@media (max-width: 1024px){.workspace{grid-template-columns:1fr}.control-panel{position:static;order:-1}}@media (max-width: 720px){.page-shell{padding:16px}.topbar{align-items:flex-start;justify-content:flex-start;padding-top:36px}.back-link{top:0}.title-block{text-align:left}.canvas-grid{grid-template-columns:1fr}.canvas-card--large{grid-row:auto}.upload-row{align-items:stretch;flex-direction:column}}