:root{color-scheme:light;--ink:#1c2733;--muted:#546273;--bg:#f4f6fa;--paper:#fff;--line:#d9e0ea;--accent:#1d4f91;--accent-2:#e8eff9}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 -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:1040px;margin:auto;padding:24px}header .shell{display:flex;justify-content:space-between;gap:20px;align-items:center;padding-block:16px;flex-wrap:wrap}.brand{font-weight:800;color:var(--ink);text-decoration:none;font-size:20px;letter-spacing:-.5px}nav{display:flex;gap:18px;flex-wrap:wrap}nav a{font-size:14px;text-decoration:none;color:var(--ink)}nav a[aria-current=page]{color:var(--accent);font-weight:700}.hero{padding:38px 0 22px;max-width:780px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:1px;color:var(--accent)}h1{font-size:clamp(28px,5vw,44px);line-height:1.28;letter-spacing:-1.4px;margin:12px 0 16px}h2{font-size:23px;letter-spacing:-.6px;margin:34px 0 12px}h3{font-size:18px;margin:6px 0}p{margin:12px 0}.lead{font-size:17px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(235px,1fr));gap:16px}.card,.panel{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:22px}.card{color:var(--ink);text-decoration:none;display:block}.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:22px 0}article{max-width:790px}label{display:block;font-size:14px;font-weight:600;margin-bottom:10px}input,select{width:100%;font:inherit;border:1px solid #a9b7c9;background:#fff;padding:10px 12px;border-radius:8px;color:var(--ink);margin-top:5px}input[type=checkbox],input[type=radio]{width:auto;margin:0 6px 0 0}.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:6px 14px}.hint{font-size:12px;color:var(--muted);font-weight:400;display:block;margin-top:3px}.inline{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:12px}.inline label{display:flex;align-items:center;margin:0}.actions{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}button{font:inherit;font-weight:600;cursor:pointer;background:var(--accent);color:#fff;border:0;border-radius:9px;padding:10px 18px}button.secondary{background:var(--accent-2);color:var(--ink)}:focus-visible{outline:3px solid #f2b658;outline-offset:3px}.result{padding:18px;background:#eef4fc;border-radius:12px;white-space:pre-line;font-variant-numeric:tabular-nums}.result.error{background:#fdeeee;color:#9e2a2a}.result:empty{display:none}.formula{font-family:ui-monospace,monospace;background:#edf1f7;padding:14px;border-radius:8px;font-size:14px;overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:14px;margin:14px 0;background:#fff}th,td{border:1px solid var(--line);padding:8px 10px;text-align:left}th{background:var(--accent-2)}.notice{background:#fff8e6;border:1px solid #f0d99a;border-radius:10px;padding:14px 16px;font-size:14px}.src li{margin:4px 0;font-size:14px}footer{margin-top:52px;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:#fff;padding:12px;z-index:10}[hidden]{display:none!important}@media(max-width:540px){.shell{padding:18px}.panel{padding:16px}}@media print{header,footer,.actions,nav{display:none}body{background:#fff}.shell{padding:0}}