.header h1,.tab.active{color:var(--primary-color)}.button,th{font-weight:600}.controls-grid,.stats-panel{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.button,.dropzone,.tab{cursor:pointer}:root{--primary-color:#4CAF50;--primary-hover:#45a049;--background-color:#f8f9fa;--border-color:#e9ecef;--text-color:#343a40;--shadow-sm:0 2px 4px rgba(0,0,0,0.05);--shadow-md:0 4px 6px rgba(0,0,0,0.1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:'Segoe UI',system-ui,-apple-system,sans-serif;line-height:1.6;color:var(--text-color);background:var(--background-color)}.container{max-width:1400px;margin:2rem auto;padding:2rem;background:#fff;border-radius:12px;box-shadow:var(--shadow-md)}.dropzone,th{background:var(--background-color)}.header{margin-bottom:2rem;padding-bottom:1rem;border-bottom:2px solid var(--border-color)}.header h1{font-size:2rem}.dropzone{border:2px dashed var(--border-color);border-radius:8px;padding:2rem;text-align:center;transition:.3s}.button,.tab{transition:.2s}.dropzone.drag-over{border-color:var(--primary-color);background:rgba(76,175,80,.1)}.controls-grid{display:grid;margin:2rem 0}.control-group,.stat-card{background:#fff;padding:1rem;border-radius:8px;box-shadow:var(--shadow-sm)}.button{background:var(--primary-color);color:#fff;border:none;padding:.75rem 1.5rem;border-radius:6px}.button:hover{background:var(--primary-hover);transform:translateY(-1px)}.button:disabled{background:#ccc;cursor:not-allowed;transform:none}input[type=number],input[type=text],select{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:6px;font-size:1rem;transition:.2s}input:focus,select:focus{outline:0;border-color:var(--primary-color);box-shadow:0 0 0 2px rgba(76,175,80,.2)}.tabs{display:flex;gap:1rem;margin-bottom:1rem}.tab{padding:.5rem 1rem;border:none;background:0 0;border-bottom:2px solid transparent}.tab.active{border-bottom-color:var(--primary-color)}.toolbar button,td,th{border:1px solid var(--border-color)}.data-preview{overflow-x:auto;margin:1rem 0}table{width:100%;border-collapse:collapse}td,th{padding:.75rem;text-align:left}.stats-panel{display:grid;margin:1rem 0}.chart-container{position:relative;height:600px;margin:2rem 0}.toolbar{position:absolute;top:10px;right:10px;display:flex;gap:.5rem}.toolbar button{padding:.5rem;background:#fff;border-radius:4px;cursor:pointer}@media (max-width:768px){.container{padding:1rem;margin:1rem}.controls-grid{grid-template-columns:1fr}.chart-container{height:400px}}