:root{--primary-color:#3498db;--secondary-color:#2ecc71;--text-color:#333;--background-color:#f5f7fa;--panel-color:#fff;--border-color:#e1e4e8;--shadow-color:rgba(0,0,0,0.1);--border-radius:8px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;color:var(--text-color);background-color:var(--background-color);line-height:1.6}.grid-generator{width:100%;max-width:1400px;margin:0 auto;padding:2rem 1rem}header{text-align:center;margin-bottom:2rem}header h1{color:var(--primary-color);font-size:2.5rem;margin-bottom:.5rem}header p{color:var(--text-color);font-size:1.1rem;opacity:.8}.tabs{display:flex;justify-content:center;margin-bottom:2rem}.tabs button{background:rgba(0,0,0,0);color:var(--text-color);padding:.75rem 1.5rem;font-size:1rem;cursor:pointer;border:none;border-bottom:2px solid rgba(0,0,0,0);transition:all .3s ease}.tabs button.active,.tabs button:hover{color:var(--primary-color)}.tabs button.active{border-bottom-color:var(--primary-color);font-weight:600}.content-container{display:grid;grid-template-columns:1fr 2fr;gap:2rem}.controls-panel{background-color:var(--panel-color);border-radius:var(--border-radius);padding:1.5rem;box-shadow:0 4px 12px var(--shadow-color)}.control-section{margin-bottom:2rem}.control-section:last-child{margin-bottom:0}.control-section h2{font-size:1.2rem;margin-bottom:1rem;color:var(--primary-color);padding-bottom:.5rem;border-bottom:1px solid var(--border-color)}.control-group{margin-bottom:1.25rem;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.control-group.full-width{grid-template-columns:1fr}.controls-panel label{display:block;font-weight:500}.controls-panel input,.controls-panel select{width:100%;padding:.5rem;margin-top:.25rem;border:1px solid var(--border-color);border-radius:4px;font-size:.9rem}.controls-panel input:focus,.controls-panel select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px rgba(52,152,219,.2)}.controls-panel input[type=range]{padding:0;cursor:pointer}.value-display{display:inline-block;margin-left:.5rem;font-size:.85rem;color:var(--text-color);opacity:.7}.preview-panel{background-color:var(--panel-color);border-radius:var(--border-radius);padding:1.5rem;box-shadow:0 4px 12px var(--shadow-color);display:flex;flex-direction:column}.preview-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.preview-header h2{font-size:1.2rem;color:var(--primary-color)}.viewport-controls{display:flex;gap:.5rem}.viewport-controls button{background-color:rgba(52,152,219,.1);border:none;border-radius:4px;color:var(--primary-color);font-size:.85rem;padding:.4rem .75rem;cursor:pointer;transition:all .2s ease}.viewport-controls button:hover{background-color:rgba(52,152,219,.2)}.viewport-controls button.active{background-color:var(--primary-color);color:#fff}.preview-container{flex:1;background-color:#f0f2f5;border-radius:var(--border-radius);border:1px dashed var(--border-color);min-height:500px;overflow:auto;transition:all .3s ease}.preview-container.mobile{max-width:360px;margin:0 auto}.preview-container.tablet{max-width:768px;margin:0 auto}.preview-container.desktop{width:100%}.grid-container{width:100%;height:100%;min-height:500px}.grid-item{font-weight:600;color:rgba(0,0,0,.7);transition:all .3s ease}.grid-item:hover{transform:scale(1.02);box-shadow:0 4px 8px rgba(0,0,0,.15)}.code-container{display:grid;grid-template-columns:1fr;gap:2rem}.code-panel{background-color:var(--panel-color);border-radius:var(--border-radius);padding:1.5rem;box-shadow:0 4px 12px var(--shadow-color)}.code-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.code-header h2{font-size:1.2rem;color:var(--primary-color)}.code-header button{background-color:var(--primary-color);color:#fff;border:none;border-radius:4px;padding:.5rem 1rem;cursor:pointer;font-size:.9rem;transition:all .3s ease}.code-header button:hover{background-color:#2980b9}.code-header button.copied{background-color:#2ecc71}.code-block{background-color:#282c34;color:#abb2bf;padding:1rem;border-radius:6px;overflow-x:auto;font-family:Consolas,Monaco,Andale Mono,monospace;font-size:.9rem;line-height:1.5}footer{margin-top:3rem;text-align:center;color:var(--text-color);opacity:.7;font-size:.9rem}@media(max-width:1024px){.content-container{grid-template-columns:1fr;gap:1.5rem}.preview-container{min-height:400px}}@media(max-width:768px){header h1{font-size:2rem}.grid-generator{padding:1rem}.control-group{grid-template-columns:1fr}.preview-header{gap:1rem}.code-header,.preview-header{flex-direction:column;align-items:flex-start}.code-header{gap:.75rem}}@media(max-width:480px){.tabs button{padding:.5rem 1rem;font-size:.9rem}}