:root{--hc-brand-color:#0d9b6f;--hc-brand-hover:#0b825c;--hc-bg-sidebar:#f8fafc;--hc-border:#e2e8f0;--hc-text-main:#1e293b;--hc-text-muted:#64748b;--hc-radius:8px;--hc-shadow:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a}*{box-sizing:border-box;margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}body{color:var(--hc-text-main);background-color:#fff;overflow:hidden}.halftone-app{width:100vw;height:100vh;display:flex;overflow:hidden}.sidebar{background-color:var(--hc-bg-sidebar);border-right:1px solid var(--hc-border);width:300px;min-width:300px;box-shadow:var(--hc-shadow);z-index:10;flex-direction:column;display:flex;overflow-y:auto}.sidebar-header{border-bottom:1px solid var(--hc-border);justify-content:space-between;align-items:center;padding:1rem;display:flex}.sidebar-header h2{color:var(--hc-brand-color);font-size:1.25rem;font-weight:600}.lang-switch{gap:.5rem;display:flex}.lang-btn{border:1px solid var(--hc-border);cursor:pointer;color:var(--hc-text-muted);background:0 0;border-radius:4px;padding:.25rem .5rem;font-size:.8rem;transition:all .2s}.lang-btn.active{background-color:var(--hc-brand-color);color:#fff;border-color:var(--hc-brand-color)}.sidebar-content{flex-direction:column;gap:1.5rem;padding:1.5rem 1rem;display:flex}.control-group{flex-direction:column;gap:.5rem;display:flex}.control-group label{color:var(--hc-text-main);justify-content:space-between;font-size:.875rem;font-weight:600;display:flex}.control-group label span.val{color:var(--hc-brand-color);font-weight:700}input[type=range]{-webkit-appearance:none;background:0 0;width:100%}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--hc-brand-color);cursor:pointer;border-radius:50%;width:16px;height:16px;margin-top:-6px;box-shadow:0 1px 3px #0000004d}input[type=range]::-webkit-slider-runnable-track{cursor:pointer;background:var(--hc-border);border-radius:2px;width:100%;height:4px}.button-grid{grid-template-columns:repeat(3,1fr);gap:.5rem;display:grid}.grid-btn{border:1px solid var(--hc-border);border-radius:var(--hc-radius);cursor:pointer;color:var(--hc-text-muted);background:#fff;flex-direction:column;justify-content:center;align-items:center;gap:.25rem;padding:.5rem;font-size:.75rem;transition:all .2s;display:flex}.grid-btn:hover{border-color:var(--hc-brand-color);color:var(--hc-brand-color)}.grid-btn.active{background-color:var(--hc-brand-color);color:#fff;border-color:var(--hc-brand-color)}.grid-btn svg{width:20px;height:20px}.color-picker-wrap{align-items:center;gap:1rem;display:flex}.color-picker-wrap input[type=color]{cursor:pointer;border:none;border-radius:50%;width:40px;height:40px;padding:0;overflow:hidden}.color-picker-wrap input[type=color]::-webkit-color-swatch-wrapper{padding:0}.color-picker-wrap input[type=color]::-webkit-color-swatch{border:none;border-radius:50%}.actions{gap:.5rem;margin-top:1rem;display:flex}.btn{border-radius:var(--hc-radius);cursor:pointer;border:none;flex:1;justify-content:center;align-items:center;gap:.5rem;padding:.75rem;font-weight:600;transition:background-color .2s;display:flex}.btn-primary{background-color:var(--hc-brand-color);color:#fff}.btn-primary:hover{background-color:var(--hc-brand-hover)}.btn-secondary{color:var(--hc-text-main);background-color:#e2e8f0}.btn-secondary:hover{background-color:#cbd5e1}.canvas-area{background-color:#e2e8f0;flex:1;justify-content:center;align-items:center;padding:2rem;display:flex;position:relative;overflow:hidden}.canvas-container{width:100%;height:100%;box-shadow:var(--hc-shadow);cursor:crosshair;background-color:#fff}.canvas-svg{display:block}@media (width<=768px){.halftone-app{flex-direction:column-reverse}.sidebar{border-right:none;border-top:1px solid var(--hc-border);width:100%;min-width:100%;height:40vh}.canvas-area{height:60vh;padding:.5rem}}