:root{--font-sans:"Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--bg:#fff;--bg-subtle:#f6f7f9;--bg-sunken:#eef1f5;--text:#111722;--text-muted:#5a6478;--text-faint:#8a93a6;--border:#e4e8ef;--border-strong:#d0d6e0;--accent:#2563eb;--accent-hover:#1d4ed8;--accent-soft:#eff4ff;--accent-line:#c7d8fb;--warm:#b45309;--warm-soft:#fef6ec;--ok:#15803d;--shadow-sm:0 1px 2px #1117220f;--shadow:0 6px 24px -8px #1117221f, 0 2px 6px -2px #1117220f;--radius:12px;--radius-sm:8px;--maxw-read:760px;--maxw-wide:1080px;--pad-x:1.25rem}*,:before,:after{box-sizing:border-box}*{margin:0}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{font-family:var(--font-sans);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;font-feature-settings:"cv01", "ss01";flex-direction:column;min-height:100dvh;font-size:1.0625rem;line-height:1.65;display:flex}img,svg{max-width:100%;display:block}h1,h2,h3,h4{letter-spacing:-.02em;color:var(--text);text-wrap:balance;font-weight:650;line-height:1.18}h1{letter-spacing:-.03em;font-size:clamp(1.85rem,1.3rem + 2.4vw,2.6rem)}h2{margin-top:2.5rem;font-size:clamp(1.35rem,1.1rem + 1.1vw,1.7rem)}h3{margin-top:1.6rem;font-size:1.15rem;font-weight:600}p{text-wrap:pretty}p+p{margin-top:1rem}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover);text-underline-offset:2px;text-decoration:underline}strong{color:var(--text);font-weight:650}ul,ol{padding-left:1.3rem}li+li{margin-top:.35rem}code{background:var(--bg-sunken);border-radius:5px;padding:.1em .4em;font-family:ui-monospace,SF Mono,Menlo,Consolas,monospace;font-size:.9em}hr{border:none;border-top:1px solid var(--border);margin:2.5rem 0}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}table,.result-card,.material-card .card-note{font-variant-numeric:tabular-nums}.site-header{z-index:50;backdrop-filter:saturate(180%)blur(8px);border-bottom:1px solid var(--border);background:#ffffffdb;position:sticky;top:0}.site-header__inner{max-width:var(--maxw-wide);padding:.75rem var(--pad-x);justify-content:space-between;align-items:center;gap:1rem;margin:0 auto;display:flex}.brand{letter-spacing:-.03em;color:var(--text);align-items:center;gap:.55rem;font-size:1.15rem;font-weight:700;display:inline-flex}.brand:hover{color:var(--text);text-decoration:none}.brand__mark{background:linear-gradient(150deg, var(--accent), #4f7cf0);color:#fff;width:26px;height:26px;box-shadow:var(--shadow-sm);border-radius:7px;place-items:center;display:grid}.site-nav{gap:1.25rem;font-size:.95rem;display:flex}.site-nav a{color:var(--text-muted);font-weight:500}.site-nav a:hover{color:var(--accent);text-decoration:none}main{flex:1 0 auto;width:100%}.article{max-width:var(--maxw-read);padding:1.5rem var(--pad-x) 3.5rem;margin:0 auto}.article>h1{margin-bottom:.75rem}.prose-page{max-width:var(--maxw-read);padding:2.5rem var(--pad-x) 4rem;margin:0 auto}.prose-page h1{margin-bottom:1.25rem}.article article>*+*,.prose-page>*+*{margin-top:1.05rem}.article article h2,.prose-page h2{margin-top:2.4rem;margin-bottom:.4rem}.article article h3{margin-bottom:.25rem}.article article ul,.prose-page ul{margin-top:.75rem}.article table,.prose-page table{border-collapse:collapse;width:100%;margin:1.25rem 0;font-size:.96rem}.article th,.prose-page th{text-align:left;text-transform:uppercase;letter-spacing:.03em;color:var(--text-muted);background:var(--bg-subtle);border-bottom:1px solid var(--border-strong);padding:.6rem .85rem;font-size:.82rem;font-weight:600}.article td,.prose-page td{border-bottom:1px solid var(--border);padding:.6rem .85rem}.article tbody tr:hover,.prose-page tbody tr:hover{background:var(--bg-subtle)}nav[aria-label=Breadcrumb]{color:var(--text-faint);font-size:.85rem}nav[aria-label=Breadcrumb] a{color:var(--text-muted)}nav[aria-label=Breadcrumb] [aria-current=page]{color:var(--text-faint)}.calculator{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);box-shadow:var(--shadow);margin:1.75rem 0;overflow:hidden}.calc-controls{background:linear-gradient(180deg, var(--bg-subtle), var(--bg));border-bottom:1px solid var(--border);padding:1.4rem 1.4rem 1.5rem}.calc-controls [role=group][aria-label=Unit\ system]{background:var(--bg-sunken);border-radius:9px;gap:3px;margin-bottom:1.1rem;padding:3px;display:inline-flex}.unit-btn{appearance:none;font:inherit;color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:7px;padding:.4rem .85rem;font-size:.9rem;font-weight:500;transition:background .15s,color .15s}.unit-btn:hover{color:var(--text)}.unit-btn.active{background:var(--bg);color:var(--accent);box-shadow:var(--shadow-sm)}.dimension-inputs{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.9rem 1rem;display:grid}.field{flex-direction:column;gap:.35rem;display:flex}.field>label,.field-label{color:var(--text-muted);letter-spacing:.01em;font-size:.8rem;font-weight:600}.field input[type=number]{font:inherit;font-variant-numeric:tabular-nums;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--bg);color:var(--text);width:100%;padding:.55rem .7rem;transition:border-color .15s,box-shadow .15s}.field input[type=number]:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);outline:none}.shape-btns{gap:.5rem;display:flex}.shape-option{border:1px solid var(--border-strong);border-radius:var(--radius-sm);cursor:pointer;flex:1;justify-content:center;align-items:center;gap:.4rem;padding:.45rem .5rem;font-size:.9rem;transition:border-color .15s,background .15s;display:inline-flex}.shape-option:has(input:checked){border-color:var(--accent);background:var(--accent-soft);color:var(--accent-hover);font-weight:500}.shape-option input{accent-color:var(--accent)}.result-card{gap:1.1rem;padding:1.4rem;display:grid}.result-primary{flex-wrap:wrap;align-items:baseline;gap:.5rem;display:flex}.result-value{letter-spacing:-.03em;color:var(--accent);font-variant-numeric:tabular-nums;font-size:clamp(2.4rem,1.6rem + 3vw,3.2rem);font-weight:700;line-height:1}.result-unit{color:var(--text-muted);font-size:1.05rem;font-weight:600}.result-details{border-top:1px solid var(--border);grid-template-columns:1fr auto;gap:.4rem 1rem;margin:0;padding-top:1rem;font-size:.92rem;display:grid}.result-details dt{color:var(--text-muted)}.result-details dd{text-align:right;font-variant-numeric:tabular-nums;font-weight:600}section[aria-labelledby=faq-heading]{margin-top:2.75rem}section[aria-labelledby=faq-heading]>div{border-bottom:1px solid var(--border);padding:1.1rem 0}section[aria-labelledby=faq-heading] h3{margin-top:0;margin-bottom:.35rem;font-size:1.05rem}section[aria-labelledby=faq-heading] p{color:var(--text-muted)}nav[aria-labelledby=related-heading]{margin-top:2.75rem}nav[aria-labelledby=related-heading] ul{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:.6rem;padding:0;list-style:none;display:grid}nav[aria-labelledby=related-heading] li{margin:0}nav[aria-labelledby=related-heading] a{border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);padding:.7rem .9rem;font-size:.92rem;font-weight:500;transition:border-color .15s,background .15s;display:block}nav[aria-labelledby=related-heading] a:hover{border-color:var(--accent-line);background:var(--accent-soft);color:var(--accent-hover);text-decoration:none}.hero{max-width:var(--maxw-wide);text-align:center;padding:3.5rem var(--pad-x) 2.5rem;margin:0 auto}.hero h1{margin-bottom:1rem}.hero p{max-width:560px;color:var(--text-muted);margin:0 auto;font-size:1.1rem}.home-section{max-width:var(--maxw-wide);padding:0 var(--pad-x);margin:0 auto}.home-section--about{max-width:var(--maxw-read);margin:3.5rem auto}.home-section h2{margin-bottom:1.25rem}.material-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:1rem;margin:0;padding:0;list-style:none;display:grid}.material-grid li{margin:0}.material-card{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);height:100%;color:inherit;padding:1.25rem;transition:border-color .15s,box-shadow .15s,transform .15s;display:block}.material-card:hover{border-color:var(--accent-line);box-shadow:var(--shadow);text-decoration:none;transform:translateY(-2px)}.material-card__name{color:var(--text);font-size:1.05rem;font-weight:600}.material-card__note{color:var(--text-muted);margin-top:.5rem;font-size:.85rem;display:block}.material-card--pillar{border-color:var(--accent-line);background:linear-gradient(180deg, var(--accent-soft), var(--bg))}.card-badge{letter-spacing:.05em;text-transform:uppercase;color:var(--warm);background:var(--warm-soft);border-radius:999px;margin-top:.5rem;padding:.15rem .5rem;font-size:.68rem;font-weight:700;display:inline-block}.site-footer{border-top:1px solid var(--border);background:var(--bg-subtle);padding:2rem var(--pad-x);text-align:center;color:var(--text-muted);margin-top:3rem;font-size:.85rem}.site-footer nav{flex-wrap:wrap;justify-content:center;gap:.4rem 1.25rem;display:flex}.site-footer nav a{color:var(--text-muted);font-weight:500}.site-footer nav a:hover{color:var(--accent);text-decoration:none}.site-footer p{color:var(--text-faint);margin-top:.9rem}@media (width<=540px){body{font-size:1rem}.site-nav{gap:.9rem}.calc-controls,.result-card{padding:1.1rem}}