:root{--navy:#0f2a47;--navy-700:#163a5f;--blue:#1f6feb;--blue-600:#1858c4;--amber:#f6a51b;--amber-600:#d98612;--ink:#16202c;--muted:#5b6b7c;--line:#e2e8f0;--line-strong:#cbd5e1;--bg:#f6f8fb;--card:#fff;--good:#15803d;--good-bg:#ecfdf3;--warn:#b45309;--warn-bg:#fffbeb;--radius:12px;--radius-sm:8px;--shadow:0 1px 2px #10202f0f, 0 8px 24px #10202f0f;--maxw:1080px;--font:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";--mono:ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{font-family:var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;margin:0;font-size:17px;line-height:1.6}a{color:var(--blue-600);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{color:var(--navy);margin:0 0 .5em;font-weight:700;line-height:1.25}h1{font-size:clamp(1.7rem,4vw,2.4rem)}h2{margin-top:1.6em;font-size:clamp(1.3rem,3vw,1.6rem)}h3{margin-top:1.3em;font-size:1.15rem}p{margin:0 0 1em}.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-header{background:var(--navy);color:#fff;z-index:40;border-bottom:3px solid var(--amber);position:sticky;top:0}.site-header .container{justify-content:space-between;align-items:center;gap:16px;height:62px;display:flex}.brand{color:#fff;align-items:center;gap:10px;font-size:1.25rem;font-weight:800;display:flex}.brand:hover{text-decoration:none}.brand .mark{display:inline-flex}.nav{flex-wrap:wrap;gap:18px;display:flex}.nav a{color:#d7e3f2;font-size:.95rem;font-weight:600}.nav a:hover{color:#fff}@media (max-width:640px){.nav{display:none}}.site-footer{background:var(--navy);color:#c6d4e4;margin-top:56px;padding:40px 0 28px;font-size:.92rem}.site-footer a{color:#c6d4e4}.site-footer a:hover{color:#fff}.footer-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:28px;margin-bottom:28px;display:grid}.footer-grid h4{color:#fff;margin-bottom:.7em;font-size:.95rem}.footer-grid ul{gap:6px;margin:0;padding:0;list-style:none;display:grid}.footer-bottom{color:#93a7bd;border-top:1px solid #ffffff1f;flex-wrap:wrap;justify-content:space-between;gap:10px;padding-top:18px;font-size:.85rem;display:flex}.main{min-height:60vh;padding:28px 0 8px}.page-head{max-width:760px}.intro{color:var(--muted);margin-bottom:1.4em;font-size:1.12rem}.breadcrumbs{color:var(--muted);margin-bottom:14px;font-size:.85rem}.breadcrumbs a{color:var(--muted)}.breadcrumbs span[aria-current]{color:var(--ink)}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.calc{grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);align-items:start;gap:22px;display:grid}@media (max-width:820px){.calc{grid-template-columns:1fr}}.calc-inputs{gap:14px;display:grid}.field{gap:5px;display:grid}.field label{color:var(--navy-700);text-transform:uppercase;letter-spacing:.03em;font-size:.82rem;font-weight:600}.field input,.field select{width:100%;color:var(--ink);border:1px solid var(--line-strong);border-radius:var(--radius-sm);background:#fff;padding:10px 12px;font-family:inherit;font-size:1rem}.field input:focus,.field select:focus{outline:2px solid var(--blue);outline-offset:1px;border-color:var(--blue)}.dims{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.row2{grid-template-columns:1fr 1fr;gap:10px;display:grid}.unit-toggle{border:1px solid var(--line-strong);background:#fff;border-radius:999px;display:inline-flex;overflow:hidden}.unit-toggle button{color:var(--muted);cursor:pointer;background:0 0;border:0;padding:7px 16px;font-size:.9rem;font-weight:600}.unit-toggle button[aria-pressed=true]{background:var(--navy);color:#fff}.checkbox{color:var(--ink);align-items:center;gap:8px;font-size:.95rem;display:flex}.checkbox input{width:auto}.result{border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(#fbfdff,#f1f6fc);min-height:150px;padding:18px}.result-hero{color:var(--navy);font-size:2.6rem;font-weight:800;line-height:1.05}.result-hero small{color:var(--muted);font-size:1rem;font-weight:600}.result-label{text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-size:.8rem;font-weight:700}.result-grid{grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:12px;margin-top:16px;display:grid}.stat{border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff;padding:10px 12px}.stat .v{color:var(--navy);font-size:1.3rem;font-weight:700}.stat .k{color:var(--muted);font-size:.78rem}.warns{gap:8px;margin-top:14px;display:grid}.warn-item{background:var(--warn-bg);color:var(--warn);border-radius:var(--radius-sm);border:1px solid #fde68a;padding:9px 12px;font-size:.88rem}.disclaimer{color:var(--muted);border-left:3px solid var(--amber);margin-top:14px;padding-left:12px;font-size:.82rem}.visual{margin-top:18px}.visual-frame{border:1px solid var(--line);border-radius:var(--radius);background:#fff;place-items:center;min-height:320px;display:grid;overflow:hidden}.visual-toolbar{align-items:center;gap:8px;margin-bottom:10px;display:flex}.visual svg{width:100%;height:auto;display:block}.btn{border:1px solid var(--line-strong);color:var(--navy);border-radius:var(--radius-sm);cursor:pointer;background:#fff;align-items:center;gap:7px;padding:8px 14px;font-size:.9rem;font-weight:600;display:inline-flex}.btn:hover{border-color:var(--blue);text-decoration:none}.btn-primary{background:var(--blue);border-color:var(--blue);color:#fff}.btn-primary:hover{background:var(--blue-600)}.btn[aria-pressed=true]{background:var(--navy);color:#fff;border-color:var(--navy)}.prose{max-width:760px;margin-top:36px}.prose h2,.prose h3{scroll-margin-top:80px}.prose table{border-collapse:collapse;width:100%;margin:1.2em 0;font-size:.94rem}.prose th,.prose td{border:1px solid var(--line);text-align:left;padding:9px 12px}.prose th{color:var(--navy);background:#f1f6fc}.prose code{font-family:var(--mono);background:#eef2f7;border-radius:5px;padding:1px 6px;font-size:.9em}.prose blockquote{border-left:4px solid var(--amber);color:var(--muted);background:var(--warn-bg);border-radius:0 8px 8px 0;margin:1.2em 0;padding:4px 16px}.faq{max-width:760px;margin-top:34px}.faq details{border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff;margin-bottom:10px;padding:0 16px}.faq summary{cursor:pointer;color:var(--navy);padding:14px 0;font-weight:600;list-style:none}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";float:right;color:var(--amber-600);font-weight:700}.faq details[open] summary:after{content:"−"}.faq details[open] summary{border-bottom:1px solid var(--line)}.faq .answer{color:var(--ink);padding:12px 0 16px}.related{margin-top:40px}.card-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;display:grid}.tile{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:16px;transition:border-color .15s,transform .15s;display:block}.tile:hover{border-color:var(--blue);text-decoration:none;transform:translateY(-2px)}.tile .t{color:var(--navy);margin-bottom:4px;font-weight:700}.tile .d{color:var(--muted);font-size:.88rem}.ad-slot{max-width:var(--maxw);border:1px dashed var(--line-strong);border-radius:var(--radius-sm);color:#94a3b8;letter-spacing:.04em;background:repeating-linear-gradient(45deg,#f1f5f9,#f1f5f9 10px,#eef2f7 10px 20px);place-items:center;min-height:100px;margin:26px auto;font-size:.78rem;display:grid}.ad-slot.ad-in-article{min-height:250px}.hero{background:linear-gradient(135deg, var(--navy), var(--navy-700));color:#fff;border-radius:0 0 24px 24px;margin-top:-28px;padding:48px 0 40px}.hero h1{color:#fff;max-width:16ch}.hero p{color:#cfe0f1;max-width:56ch;font-size:1.15rem}.family-grid{z-index:2;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px;margin-top:-28px;display:grid;position:relative}.family-card{border:1px solid var(--line);border-top:4px solid var(--amber);border-radius:var(--radius);box-shadow:var(--shadow);background:#fff;padding:20px}.family-card h3{margin-top:0}.family-card ul{gap:6px;margin:12px 0 0;padding:0;list-style:none;display:grid}.family-card .blurb{color:var(--muted);font-size:.95rem}.badge{background:var(--amber);color:#3a2702;letter-spacing:.04em;vertical-align:middle;border-radius:999px;margin-left:6px;padding:2px 7px;font-size:.68rem;font-weight:800;display:inline-block}.section{margin-top:44px}.muted{color:var(--muted)}.note{color:var(--muted);font-size:.9rem}.legend{color:var(--muted);flex-wrap:wrap;gap:14px;margin-top:8px;font-size:.82rem;display:flex}.legend span{align-items:center;gap:6px;display:inline-flex}.swatch{border-radius:3px;width:14px;height:14px;display:inline-block}.skip-link{position:absolute;left:-9999px}.skip-link:focus{z-index:100;background:#fff;border-radius:8px;padding:10px 14px;position:fixed;top:12px;left:12px}