:root{--ink:#263c3a;--teal:#27645c;--paper:#f7f5ef;--line:#d9dfdc;font-family:system-ui,"Noto Sans Thai",sans-serif;color:var(--ink)}*{box-sizing:border-box}body{margin:0;background:var(--paper);line-height:1.72}.shell{width:min(1080px,calc(100% - 36px));margin:auto}.head{display:flex;justify-content:space-between;align-items:center;min-height:72px;border-bottom:1px solid var(--line)}.brand{font-weight:800;text-decoration:none}nav{display:flex;gap:18px}nav a{text-decoration:none;color:inherit}.hero,.split{display:grid;grid-template-columns:1fr 1fr;gap:45px;align-items:center;padding:58px 0}.hero h1{font-size:clamp(2.3rem,5vw,4.3rem);line-height:1.2;margin:.25em 0}.hero figure,.split figure{margin:0}.hero img,.split img,.grid img{display:block;width:100%;aspect-ratio:1.55;object-fit:cover;border-radius:14px}.tag{font-weight:750;color:var(--teal)}.button{display:inline-block;background:var(--teal);color:white;padding:11px 18px;border-radius:5px;text-decoration:none;font-weight:750}.muted,figcaption{font-size:.9rem;color:#586765}.split{border-top:1px solid var(--line)}.split h2,.calc h2{font-size:clamp(1.8rem,3vw,2.6rem);line-height:1.25}.calc{padding:54px 0;background:#e8efeb}.formula{background:white;padding:14px;border-left:4px solid #d48f5d}.grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start}fieldset{padding:18px;background:white;border:1px solid #b8c8c1;border-radius:12px}legend{font-weight:800}label{display:block;font-weight:650;margin:11px 0}input,textarea{display:block;width:100%;margin-top:5px;padding:10px;border:1px solid #aebeb8;border-radius:6px;background:white;color:var(--ink);font:inherit}input:focus-visible,textarea:focus-visible{outline:3px solid #d99d6c}output{display:block;margin-top:18px;font-size:1.2rem;font-weight:800}.foot{border-top:1px solid var(--line);padding:24px 0 40px}.skip{position:absolute;left:-9999px}.skip:focus{left:10px;top:10px;background:#fff;padding:8px}@media(max-width:760px){.shell{width:calc(100% - 28px)}.head{align-items:flex-start;flex-direction:column;padding:14px 0;gap:8px}nav{gap:14px}.hero,.split,.grid{grid-template-columns:1fr;gap:22px}.hero,.split{padding:38px 0}}
