/* Paper Size Guide — lightweight responsive styles */
:root{--ink:#202b3c;--muted:#5c6878;--blue:#2459a9;--blue2:#eaf2ff;--line:#dce3ec;--paper:#fff;--wash:#f5f8fc;--max:1120px;--radius:16px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:6rem}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}a{color:var(--blue);text-underline-offset:3px}a:hover{text-decoration-thickness:2px}.skip{position:absolute;left:-9999px;top:0;background:#fff;padding:.8rem;z-index:100}.skip:focus{left:1rem;top:1rem}.wrap{width:min(calc(100% - 2rem),var(--max));margin-inline:auto}.site-header{position:sticky;top:0;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);z-index:20;backdrop-filter:blur(8px)}.navrow{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:1rem}.brand{display:flex;align-items:center;gap:.65rem;color:var(--ink);text-decoration:none;font-weight:800;letter-spacing:-.03em;font-size:1.08rem}.brand img{width:34px;height:34px}.navlinks{display:flex;align-items:center;gap:1.15rem}.navlinks a{font-size:.92rem;text-decoration:none;color:var(--ink)}.navlinks a:hover,.navlinks a:focus{color:var(--blue)}.menu-toggle{display:none;background:white;border:1px solid var(--line);border-radius:9px;padding:.55rem .75rem;font:inherit;color:var(--ink)}.hero{background:linear-gradient(180deg,#f5f8ff 0%,#fff 100%);padding:4rem 0 3rem;border-bottom:1px solid var(--line)}.eyebrow{font-size:.78rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--blue)}h1,h2,h3{line-height:1.2;letter-spacing:-.035em}h1{font-size:clamp(2.2rem,5vw,4rem);max-width:850px;margin:.6rem 0 1rem}h2{font-size:clamp(1.65rem,3vw,2.3rem);margin:0 0 1rem}h3{font-size:1.2rem;margin:1.4rem 0 .5rem}.lead{font-size:1.15rem;color:#435168;max-width:780px}.hero-actions{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.5rem}.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--blue);background:var(--blue);color:white;text-decoration:none;font-weight:700;padding:.72rem 1.05rem;border-radius:10px;cursor:pointer;font:inherit;font-weight:700}.btn.secondary{background:white;color:var(--blue)}.section{padding:3.5rem 0;border-bottom:1px solid var(--line)}.section.alt{background:var(--wash)}.section-intro{color:var(--muted);max-width:760px;margin-top:-.2rem;margin-bottom:1.5rem}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.2rem}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.25rem;min-width:0}.card h3:first-child{margin-top:0}.paper-stage{min-height:255px;background:#f7f9fc;border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;justify-content:center;gap:2rem;padding:1.25rem;overflow:hidden}.paper{background:#fff;border:2px solid #6f91c9;box-shadow:0 5px 15px #1b315012;position:relative;flex:none;display:flex;align-items:center;justify-content:center;text-align:center;color:var(--blue);font-weight:800;font-size:.85rem}.paper.a4{width:104px;height:147px}.paper.letter{width:107px;height:138px;border-color:#d49b4b;color:#8b5b15}.paper.a3{width:104px;height:147px}.paper.a5{width:104px;height:147px}.paper-label{text-align:center;font-weight:700;margin-top:.65rem}.measure{font-size:.9rem;color:var(--muted);text-align:center}.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:12px}table{width:100%;border-collapse:collapse;background:white;font-variant-numeric:tabular-nums}th,td{text-align:left;padding:.8rem .9rem;border-bottom:1px solid var(--line);vertical-align:top}th{background:#f0f5fc;font-size:.88rem}tr:last-child td{border-bottom:0}.table-scroll table{min-width:560px}.tool{display:grid;grid-template-columns:1fr 1fr;gap:1rem;align-items:start}.field label{display:block;font-weight:700;margin-bottom:.35rem}.field select,.field input{width:100%;min-height:46px;border:1px solid #b8c4d4;border-radius:9px;padding:.65rem .75rem;background:white;color:var(--ink);font:inherit}.result{background:var(--blue2);border:1px solid #c8dcff;border-radius:14px;padding:1.25rem}.result .big{font-size:1.45rem;font-weight:800;letter-spacing:-.025em;display:block}.result p{margin:.25rem 0;color:#334a6d}.note{border-left:4px solid var(--blue);padding:.8rem 1rem;background:#f3f7ff;border-radius:0 9px 9px 0;color:#34445a}.muted{color:var(--muted)}.checklist{padding-left:1.3rem}.checklist li{margin:.45rem 0}.faq details{border-bottom:1px solid var(--line);padding:1rem 0}.faq summary{font-weight:750;cursor:pointer}.faq details p{margin-bottom:.25rem}.source-list li{margin:.6rem 0;overflow-wrap:anywhere}.byline{font-size:.92rem;color:var(--muted)}.site-footer{padding:2.2rem 0;background:#f5f8fc}.footerrow{display:flex;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}.footerlinks{display:flex;flex-wrap:wrap;gap:.9rem}.footerlinks a{font-size:.9rem}.prose{max-width:820px}.prose p{margin:.8rem 0}.prose h2{margin-top:2.3rem}.prose h3{margin-top:1.5rem}.breadcrumb{font-size:.9rem;color:var(--muted);margin-bottom:1rem}.breadcrumb a{color:var(--muted)}.small{font-size:.9rem}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}:focus-visible{outline:3px solid #f2b84b;outline-offset:3px}footer p{margin:.3rem 0}@media(max-width:760px){.navrow{min-height:64px}.menu-toggle{display:inline-flex}.navlinks{display:none;position:absolute;top:64px;left:0;right:0;background:white;border-bottom:1px solid var(--line);padding:1rem;align-items:stretch;flex-direction:column;gap:.2rem}.navlinks.open{display:flex}.navlinks a{padding:.65rem}.hero{padding:3rem 0 2.4rem}.section{padding:2.6rem 0}.grid,.tool{grid-template-columns:1fr}.paper-stage{gap:1.2rem;min-height:220px}.paper.a4{width:90px;height:127px}.paper.letter{width:93px;height:120px}.wrap{width:min(calc(100% - 1.25rem),var(--max))}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}