:root{color-scheme:light;--ink:#203331;--muted:#536763;--bg:#f6f7f2;--paper:#fff;--line:#dbe4dc;--accent:#146855}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 -apple-system,BlinkMacSystemFont,'Apple SD Gothic Neo','Malgun Gothic',sans-serif}a{color:var(--accent);text-underline-offset:4px}header{background:var(--paper);border-bottom:1px solid var(--line)}.shell{max-width:1080px;margin:auto;padding:24px}header .shell{display:flex;justify-content:space-between;gap:20px;align-items:center;padding-block:18px;flex-wrap:wrap}.brand{font-weight:750;color:var(--ink);text-decoration:none;font-size:21px}nav{display:flex;gap:20px;flex-wrap:wrap}nav a{font-size:14px;text-decoration:none}.hero{padding:42px 0 28px;max-width:760px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:1px;color:var(--accent)}h1{font-size:clamp(30px,5vw,49px);line-height:1.25;letter-spacing:-1.7px;margin:14px 0 20px}h2{font-size:24px;letter-spacing:-.7px;margin:36px 0 14px}h3{font-size:19px;margin:8px 0}p{margin:14px 0}.lead{font-size:18px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(245px,1fr));gap:18px}.card,.panel{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:24px}.card{color:var(--ink);text-decoration:none}.card:hover{border-color:var(--accent)}.card p,.muted{color:var(--muted);font-size:14px}.tag{font-size:12px;color:var(--accent);font-weight:700}.panel{margin:24px 0}article{max-width:780px}label{display:block;font-size:14px;font-weight:600;margin-bottom:12px}input,select,textarea{width:100%;font:inherit;border:1px solid #a4b9af;background:white;padding:11px 12px;border-radius:8px;color:var(--ink);margin-top:5px}input[type=checkbox]{width:auto}.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px 14px}.products{display:grid;grid-template-columns:repeat(auto-fit,minmax(245px,1fr));gap:18px}.product{padding:20px;border:1px solid var(--line);border-radius:12px}.product h3{margin-bottom:16px}.actions{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}button,.btn{font:inherit;font-weight:600;cursor:pointer;background:var(--accent);color:white;border:0;border-radius:9px;padding:11px 18px;text-decoration:none}button.secondary{background:#e7eee8;color:var(--ink)}button:disabled{opacity:.5;cursor:default}:focus-visible{outline:3px solid #f2b658;outline-offset:3px}.result{padding:20px;background:#edf5ee;border-radius:12px;white-space:pre-line;font-variant-numeric:tabular-nums}.error{color:#9e3030}.formula{font-family:ui-monospace,monospace;background:#edf1e9;padding:15px;border-radius:8px;font-size:14px}details{border-bottom:1px solid var(--line);padding:14px 0}summary{cursor:pointer;font-weight:600}footer{margin-top:56px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}footer .shell{display:flex;gap:18px;flex-wrap:wrap;justify-content:space-between}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:white;padding:12px;z-index:10}.result:empty{display:none}@media(max-width:540px){.shell{padding:18px}.hero{padding-top:28px}.panel{padding:18px}.product{padding:14px}}@media print{header,footer,.actions{display:none}body{background:white}.shell{padding:0}.panel{break-inside:avoid}}