:root{--ink:#152521;--muted:#52645f;--paper:#fbfcf9;--card:#fff;--line:#dce6df;--accent:#d18339;--accent-light:#fff1df;--dark:#242e2b;font-family:system-ui,-apple-system,"Segoe UI",Arial,sans-serif;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-size:16px;line-height:1.65}a{color:#165951;text-decoration-thickness:1px;text-underline-offset:.19em}a:hover{color:var(--accent)}a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.shell{max-width:1140px;margin:auto;padding:0 22px}.skip{position:absolute;top:-80px;left:15px;background:#fff;padding:10px;z-index:5}.skip:focus{top:8px}.masthead{background:var(--dark);color:#fff;border-bottom:3px solid var(--accent)}.top{min-height:82px;display:flex;justify-content:space-between;align-items:center;gap:24px}.wordmark{display:inline-flex;align-items:center;gap:9px;color:white;text-decoration:none;font-weight:800;font-size:1.25rem;white-space:nowrap}.wordmark:hover{color:white}.brand-mark{display:inline-grid;place-items:center;border:1px solid #ffffff55;background:#ffffff18;color:#fff;border-radius:9px;width:34px;height:34px;font-size:.85rem}.top nav{display:flex;flex-wrap:wrap;gap:5px}.top nav a{color:#f1f6f2;padding:7px 10px;text-decoration:none;border-radius:7px;font-size:.86rem}.top nav a:hover,.top nav a.current{background:#ffffff25;color:#fff}.eyebrow{color:var(--accent);font-size:.76rem;text-transform:uppercase;letter-spacing:.15em;font-weight:800;margin-top:36px}.hero{padding:20px 0 30px;max-width:860px}h1{font-weight:830;line-height:1.12;letter-spacing:-.04em;font-size:clamp(2.1rem,4.4vw,3.6rem);margin:8px 0 18px}h2{font-size:1.5rem;letter-spacing:-.025em;line-height:1.25;margin:0 0 15px}.lead{font-size:1.18rem;color:var(--muted);line-height:1.6;max-width:760px}.hero-note{border-left:4px solid var(--accent);background:var(--accent-light);color:#473e32;padding:13px 17px;margin:24px 0 0;max-width:730px;border-radius:0 8px 8px 0;font-size:.94rem}.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;align-items:start}.article-section{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px 30px;margin-bottom:18px}.article-section p{margin:0 0 16px;color:#34443d}.article-section p:last-child{margin-bottom:0}.detail-list{padding-left:20px;margin:0;color:#354840}.detail-list li{margin:9px 0}.layout aside{position:sticky;top:20px;padding:24px;border:1px solid var(--line);border-radius:14px;background:#f1f6f0}.layout aside h2{font-size:1.08rem}.topic-grid{display:grid;gap:10px}.topic-card{display:grid;gap:5px;padding:15px;background:white;border:1px solid var(--line);border-radius:10px;text-decoration:none;color:var(--ink);transition:border-color .15s}.topic-card:hover{border-color:var(--accent)}.topic-card strong{line-height:1.28}.topic-card span:last-child{font-size:.85rem;color:var(--muted)}.topic-tag{font-size:.67rem;font-weight:800;letter-spacing:.07em;text-transform:uppercase;color:var(--accent)}.faq details{padding:13px 0;border-bottom:1px solid var(--line)}.faq summary{cursor:pointer;font-weight:750}.faq details p{margin:10px 0 3px}.sources a{overflow-wrap:anywhere}.closing{background:var(--dark);color:white;padding:27px;border-radius:14px;margin:26px 0 55px}.closing p{color:#e5eee7}.closing h2{margin-bottom:8px}footer{border-top:1px solid var(--line);color:var(--muted);font-size:.83rem;padding:20px 0 30px}.footer-inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px}.footer-inner p{margin:0}@media(max-width:880px){.layout{grid-template-columns:1fr}.layout aside{position:static}.top{display:block;padding-top:15px;padding-bottom:12px}.top nav{padding-top:12px}.shell{padding-left:16px;padding-right:16px}.article-section{padding:21px}.hero{padding-bottom:18px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* R9: readable comparison tables and a searchable editorial guide directory. */
.table-scroll{margin:20px 0 4px;overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
.table-scroll table{width:100%;min-width:480px;border-collapse:collapse;text-align:left;font-size:.93rem;line-height:1.45}
.table-scroll caption{padding:13px 15px;background:#f2f5f0;font-size:.82rem;text-align:left;font-weight:750;color:var(--muted)}
.table-scroll th{background:#f7f8f5;color:var(--ink);font-weight:750}
.table-scroll th,.table-scroll td{padding:12px 13px;border-bottom:1px solid var(--line);vertical-align:top}
.table-scroll tbody tr:last-child td{border-bottom:0}
.table-scroll tbody tr:nth-child(even){background:#f9faf8}
.catalog-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:18px}
.catalog-grid .topic-card{min-height:113px}
@media(max-width:600px){.catalog-grid{grid-template-columns:1fr}.table-scroll table{min-width:430px}.table-scroll th,.table-scroll td{padding:10px}}
/* R9: geometry-only browser calculator. */
.calc-form{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:18px 0 12px}
.calc-form label{display:grid;gap:5px;font-size:.85rem;font-weight:700;color:var(--muted)}
.calc-form input{min-width:0;max-width:100%;border:1px solid #c7d2ca;border-radius:8px;background:#fff;padding:12px;color:var(--ink);font:inherit}
.calc-form input:focus-visible{outline:3px solid var(--accent);outline-offset:1px}
.calc-result{display:block;background:#eef6ed;border:1px solid #c2d7c6;border-radius:9px;padding:14px;font-weight:800;font-size:1.24rem}
.calc-help{font-size:.8rem;margin-top:10px!important;color:var(--muted)!important}
@media(max-width:590px){.calc-form{grid-template-columns:1fr}}