:root{--bg-primary: #0f172a;--bg-secondary: #1e293b;--text-primary: #f8fafc;--text-secondary: #94a3b8;--accent: #3b82f6;--accent-hover: #2563eb;--border: #334155}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);overflow:hidden}*{box-sizing:border-box}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--bg-secondary);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--border)}.app-layout{display:flex;height:100vh;width:100vw}.sidebar{width:320px;background-color:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:1.5rem;overflow-y:auto;flex-shrink:0}.main-content{flex:1;display:flex;flex-direction:column;background-color:#0f172a;padding:2rem;overflow:hidden;align-items:center;justify-content:center}.preview-container{width:100%;height:100%;max-width:1200px;max-height:800px;background-color:#fff;border-radius:12px;box-shadow:0 10px 30px #00000080;overflow:hidden;position:relative;display:flex;align-items:center;justify-content:center;background-image:linear-gradient(45deg,#ccc 25%,transparent 25%),linear-gradient(-45deg,#ccc 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#ccc 75%),linear-gradient(-45deg,transparent 75%,#ccc 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0px}.control-group{margin-bottom:1.5rem}.control-group label{display:block;font-size:.875rem;color:var(--text-secondary);margin-bottom:.5rem;font-weight:500}input[type=range]{width:100%;accent-color:var(--accent);cursor:pointer}input[type=color]{-webkit-appearance:none;border:none;width:100%;height:40px;border-radius:6px;cursor:pointer;background:none;padding:0}input[type=color]::-webkit-color-swatch-wrapper{padding:0}input[type=color]::-webkit-color-swatch{border:1px solid var(--border);border-radius:6px}select,input[type=text],input[type=number]{width:100%;padding:.5rem;background-color:var(--bg-primary);border:1px solid var(--border);border-radius:6px;color:var(--text-primary);font-size:.9rem}select:focus,input:focus{outline:2px solid var(--accent);border-color:transparent}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;background-color:var(--accent);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:background-color .2s;width:100%}.btn:hover{background-color:var(--accent-hover)}.header{margin-bottom:2rem;padding-bottom:1rem;border-bottom:1px solid var(--border)}.header h1{font-size:1.25rem;margin:0;color:var(--text-primary);display:flex;align-items:center;gap:.5rem}