:root{color:#111827;background:#eff6ff;font-family:Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0}.app{max-width:760px;margin:0 auto;padding:24px}.back-button{cursor:pointer;color:#0f172a;background:#fff;border:1px solid #cbd5e1;border-radius:10px;padding:8px 12px;font-size:14px;font-weight:600}.panel{background:#fff;border-radius:12px;gap:12px;margin-top:18px;padding:16px;display:grid}label{gap:6px;font-weight:600;display:grid}input,select{border:1px solid #d1d5db;border-radius:8px;padding:10px;font-size:16px}.result{background:#fff;border-radius:12px;margin-top:16px;padding:16px}h1,h2,p{margin:0}h1{margin-top:12px}