:root{--primary-color: #2563eb;--primary-hover: #1d4ed8;--bg-color: #f3f4f6;--card-bg: #ffffff;--text-color: #1f2937;--border-color: #e5e7eb;--danger-color: #ef4444}body{font-family:Inter,sans-serif;background-color:var(--bg-color);color:var(--text-color);margin:0;padding:0;display:flex;justify-content:center;min-height:100vh}#app{width:100%;max-width:1000px;margin:2rem}.container{width:100%}h1{text-align:center;margin-bottom:.5rem}.subtitle{text-align:center;color:#6b7280;margin-bottom:2rem}.card{background:var(--card-bg);padding:1.5rem;border-radius:8px;box-shadow:0 1px 3px #0000001a;margin-bottom:1.5rem}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.section-header h2{margin:0;font-size:1.25rem}.row{display:flex;gap:1rem;margin-bottom:1rem}.group,.group-small,.group-medium,.group-large{display:flex;flex-direction:column}.group{flex:1}.group-small{width:140px}.group-medium{flex:1}.group-large{flex:2}.group-checkbox{display:flex;align-items:center;padding-top:1.5rem;margin-left:.5rem}label{font-size:.875rem;font-weight:500;margin-bottom:.25rem;color:#374151}input,select{padding:.5rem;border:1px solid var(--border-color);border-radius:4px;font-family:inherit;font-size:.9rem}.hint{font-size:.8rem;color:#6b7280;margin-top:-.5rem;margin-bottom:1rem}.dynamic-list{display:flex;flex-direction:column;gap:.5rem}.dynamic-row{display:flex;gap:.8rem;align-items:flex-start;padding:.75rem;background:#f9fafb;border:1px solid var(--border-color);border-radius:4px}.btn-primary{background-color:var(--primary-color);color:#fff;border:none;padding:.75rem 1.5rem;border-radius:4px;cursor:pointer;font-weight:600;font-size:1rem;width:100%}.btn-primary:hover{background-color:var(--primary-hover)}.btn-secondary{background-color:#fff;color:var(--primary-color);border:1px solid var(--primary-color);padding:.4rem .8rem;border-radius:4px;cursor:pointer;font-size:.875rem}.btn-secondary:hover{background-color:#eff6ff}.btn-icon{background:none;border:none;color:#9ca3af;font-size:1.5rem;cursor:pointer;padding:0;margin-top:1.6rem}.btn-icon:hover{color:var(--danger-color)}.actions{margin-top:2rem}.hidden{display:none!important}#chart-section{background:#fff;padding:2rem;box-shadow:0 4px 6px -1px #0000001a;min-height:800px}.toolbar{display:flex;justify-content:space-between;margin-bottom:2rem}.toolbar .btn-primary{width:auto}@media print{#input-section,.toolbar,#splash-screen{display:none!important}#chart-section{display:block!important;box-shadow:none;padding:0}#chart-container{border:none;box-shadow:none}body,#app{background:#fff;margin:0;width:100%;max-width:none}}#splash-screen{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#0d1117;z-index:9999;display:flex;justify-content:center;align-items:center;flex-direction:column;color:#fff;transition:opacity 1s ease-out,visibility 1s}#splash-screen.hidden{opacity:0;visibility:hidden;pointer-events:none}.splash-content{text-align:center;width:80%;max-width:600px}.splash-title{font-size:3rem;font-weight:800;letter-spacing:2px;margin-bottom:.5rem;background:linear-gradient(90deg,#00f0ff,#00ff9d);-webkit-background-clip:text;-webkit-text-fill-color:transparent;opacity:0;animation:fadeIn 1s ease-out .5s forwards}.splash-subtitle{font-size:1.2rem;color:#8b949e;margin-bottom:2rem;opacity:0;animation:fadeIn 1s ease-out 1s forwards}.ecg-svg{width:100%;height:auto;filter:drop-shadow(0 0 5px #00f0ff)}.ecg-svg polyline{fill:none;stroke:#00f0ff;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:2000;stroke-dashoffset:2000;animation:drawECG 2.5s ease-in-out forwards}.splash-credits{margin-top:3rem;font-size:.9rem;color:#8b949e;opacity:0;animation:fadeIn 1s ease-out 2s forwards}.splash-credits strong{color:#fff}@keyframes drawECG{0%{stroke-dashoffset:2000}to{stroke-dashoffset:0}}@keyframes fadeIn{to{opacity:1}}