:root{--navy-900:#0e1b33;--navy-800:#14243f;--navy-700:#1c3a63;--navy-600:#22497c;--navy-500:#2c5da3;--blue-50:#eef4fb;--blue-100:#dbe7f6;--amber-600:#c2410c;--amber-500:#e8590c;--amber-400:#f97316;--amber-50:#fff4ed;--ink-900:#111621;--ink-800:#1d2431;--ink-700:#333c4d;--ink-600:#4b5566;--ink-500:#6b7486;--ink-400:#9099a8;--line:#e5e8ee;--line-strong:#d3d8e2;--surface:#f7f8fb;--surface-2:#eef1f6;--white:#ffffff;--green-600:#15803d;--green-50:#ecfdf3;--color-bg:var(--white);--color-fg:var(--ink-900);--color-muted:var(--ink-500);--color-primary:var(--navy-700);--color-primary-ink:var(--navy-800);--color-accent:var(--amber-500);--color-border:var(--line);--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;--font-serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;--font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;--maxw:1120px;--maxw-prose:720px;--radius:10px;--radius-lg:16px;--radius-sm:6px;--shadow-sm:0 1px 2px rgba(16,27,51,.06),0 1px 3px rgba(16,27,51,.05);--shadow-md:0 4px 12px rgba(16,27,51,.08),0 2px 4px rgba(16,27,51,.04);--shadow-lg:0 12px 32px rgba(16,27,51,.12);--step--1:clamp(.83rem,.8rem + .15vw,.9rem);--step-0:clamp(1rem,.96rem + .2vw,1.08rem);--step-1:clamp(1.2rem,1.1rem + .4vw,1.4rem);--step-2:clamp(1.45rem,1.3rem + .7vw,1.85rem);--step-3:clamp(1.8rem,1.5rem + 1.2vw,2.5rem);--step-4:clamp(2.2rem,1.7rem + 2vw,3.4rem)}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;font-family:var(--font-sans);font-size:var(--step-0);line-height:1.7;color:var(--color-fg);background:var(--color-bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}img,svg,video{max-width:100%;height:auto;display:block}a{color:var(--navy-600);text-decoration:none}a:hover{color:var(--amber-600);text-decoration:underline;text-underline-offset:3px}h1,h2,h3,h4{line-height:1.2;font-weight:750;letter-spacing:-.015em;color:var(--ink-900);margin:0 0 .5em;text-wrap:balance}h1{font-size:var(--step-4)}h2{font-size:var(--step-3)}h3{font-size:var(--step-2)}h4{font-size:var(--step-1)}p{margin:0 0 1.1em}ul,ol{margin:0 0 1.1em;padding-left:1.3em}li{margin:.35em 0}strong{font-weight:700;color:var(--ink-900)}hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}blockquote{margin:1.5rem 0;padding:.6rem 1.2rem;border-left:4px solid var(--amber-500);background:var(--amber-50);border-radius:0 var(--radius) var(--radius) 0;color:var(--ink-700)}code{font-family:var(--font-mono);font-size:.9em;background:var(--surface-2);padding:.15em .4em;border-radius:4px}:focus-visible{outline:3px solid var(--amber-400);outline-offset:2px;border-radius:3px}.container{max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(1rem,4vw,2rem)}.prose{max-width:var(--maxw-prose)}.section{padding-block:clamp(2.5rem,6vw,4.5rem)}.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--amber-600);margin-bottom:.6rem}.lede{font-size:var(--step-1);color:var(--ink-600);line-height:1.55}.muted{color:var(--color-muted)}.center{text-align:center}.btn{display:inline-flex;align-items:center;gap:.5rem;font-weight:650;font-size:.95rem;padding:.7rem 1.25rem;border-radius:var(--radius);border:1px solid transparent;cursor:pointer;transition:transform .12s ease,box-shadow .15s ease,background .15s;text-decoration:none}.btn:hover{text-decoration:none;transform:translateY(-1px)}.btn-primary{background:var(--navy-700);color:#fff}.btn-primary:hover{background:var(--navy-800);color:#fff;box-shadow:var(--shadow-md)}.btn-accent{background:var(--amber-500);color:#fff}.btn-accent:hover{background:var(--amber-600);color:#fff;box-shadow:var(--shadow-md)}.btn-ghost{background:#fff;color:var(--navy-700);border-color:var(--line-strong)}.btn-ghost:hover{background:var(--blue-50);color:var(--navy-800)}.site-header{position:sticky;top:0;z-index:50;background:#ffffffeb;backdrop-filter:saturate(160%) blur(8px);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:64px}.brand{display:flex;align-items:center;gap:.55rem;font-weight:800;font-size:1.15rem;color:var(--ink-900);letter-spacing:-.02em}.brand:hover{text-decoration:none;color:var(--ink-900)}.brand .dot{color:var(--amber-500)}.brand-mark{width:30px;height:30px;flex:none}.nav-links{display:flex;align-items:center;gap:.35rem;list-style:none;margin:0;padding:0}.nav-links a{color:var(--ink-700);font-weight:550;font-size:.95rem;padding:.5rem .7rem;border-radius:8px}.nav-links a:hover{background:var(--surface);color:var(--navy-700);text-decoration:none}.nav-toggle{display:none;background:none;border:1px solid var(--line-strong);border-radius:8px;padding:.4rem .55rem;cursor:pointer}@media (max-width:860px){.nav-links{position:absolute;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;background:#fff;border-bottom:1px solid var(--line);padding:.5rem;gap:.15rem;display:none;box-shadow:var(--shadow-md)}.nav-links.open{display:flex}.nav-links a{padding:.7rem .8rem}.nav-toggle{display:inline-flex}}.site-footer{background:var(--navy-900);color:#c7d2e2;margin-top:4rem;padding-block:3rem 1.5rem;font-size:.95rem}.site-footer a{color:#c7d2e2}.site-footer a:hover{color:#fff}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:2rem}@media (max-width:760px){.footer-grid{grid-template-columns:1fr 1fr}}@media (max-width:460px){.footer-grid{grid-template-columns:1fr}}.footer-grid h4{color:#fff;font-size:.85rem;text-transform:uppercase;letter-spacing:.06em}.footer-grid ul{list-style:none;padding:0;margin:0}.footer-grid li{margin:.4rem 0}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:2rem;padding-top:1.2rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:.5rem;color:#94a6bf;font-size:.85rem}.grid{display:grid;gap:1.25rem}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media (max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}@media (max-width:600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:1.4rem;transition:box-shadow .18s ease,transform .18s ease,border-color .18s}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);border-color:var(--line-strong)}.card h3{font-size:1.15rem;margin-bottom:.4rem}.card p{color:var(--ink-600);font-size:.95rem;margin-bottom:.6rem}.card .kicker{font-size:.72rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--amber-600)}a.card:hover{text-decoration:none}.card-link{font-weight:650;color:var(--navy-600);font-size:.9rem}.hero{background:radial-gradient(1200px 500px at 80% -10%,var(--blue-50),transparent 60%),radial-gradient(900px 400px at 0% 0%,var(--amber-50),transparent 55%);border-bottom:1px solid var(--line)}.hero-inner{padding-block:clamp(3rem,7vw,5.5rem)}.hero h1{max-width:16ch}.hero .lede{max-width:52ch;margin-top:.4rem}.hero-actions{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1.6rem}.trust-row{display:flex;gap:1.5rem;flex-wrap:wrap;margin-top:2rem;color:var(--ink-600);font-size:.9rem;align-items:center}.trust-row .ti{display:flex;align-items:center;gap:.45rem}.trust-row svg{color:var(--green-600);flex:none}.pill{display:inline-block;background:var(--surface);border:1px solid var(--line);color:var(--ink-600);font-size:.78rem;font-weight:600;padding:.2rem .6rem;border-radius:999px}.pill-accent{background:var(--amber-50);border-color:#f6d5be;color:var(--amber-600)}.crumbs{font-size:.85rem;color:var(--ink-500);padding:1rem 0 0}.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem;padding:0;margin:0}.crumbs li{display:flex;gap:.4rem;align-items:center}.crumbs li+li:before{content:"/";color:var(--ink-400)}.crumbs a{color:var(--ink-500)}.crumbs a:hover{color:var(--navy-600)}.article{padding-block:2rem 3rem}.article-head{max-width:var(--maxw-prose);margin-bottom:1.5rem}.article-head h1{font-size:var(--step-3);margin-top:.5rem}.article-meta{display:flex;flex-wrap:wrap;gap:.6rem 1rem;align-items:center;color:var(--ink-500);font-size:.88rem;margin-top:.8rem}.article-body{max-width:var(--maxw-prose)}.article-body h2{margin-top:2.2rem;padding-top:.4rem;font-size:var(--step-2)}.article-body h3{margin-top:1.6rem;font-size:var(--step-1)}.article-body table{width:100%;border-collapse:collapse;margin:1.4rem 0;font-size:.94rem;display:block;overflow-x:auto}.article-body th,.article-body td{border:1px solid var(--line);padding:.6rem .8rem;text-align:left}.article-body thead th{background:var(--navy-800);color:#fff;font-weight:650;white-space:nowrap}.article-body tbody tr:nth-child(2n){background:var(--surface)}.article-body a{text-decoration:underline;text-underline-offset:2px;text-decoration-color:#c9d6ea}.article-body img{border-radius:var(--radius);border:1px solid var(--line);margin:1.4rem 0}.callout{border:1px solid var(--line);border-left:4px solid var(--navy-600);background:var(--surface);border-radius:0 var(--radius) var(--radius) 0;padding:1.1rem 1.3rem;margin:1.6rem 0}.callout.tip{border-left-color:var(--amber-500);background:var(--amber-50)}.callout h4{margin:0 0 .5rem;font-size:1rem}.callout p:last-child,.callout ul:last-child{margin-bottom:0}.tldr{background:var(--blue-50);border:1px solid var(--blue-100);border-radius:var(--radius);padding:1.2rem 1.4rem;margin:1.5rem 0}.tldr h2{font-size:1.05rem;margin:0 0 .6rem;text-transform:uppercase;letter-spacing:.05em;color:var(--navy-700)}.tldr ul{margin:0;padding-left:1.1rem}.authorbox{display:flex;gap:1.1rem;align-items:flex-start;border:1px solid var(--line);border-radius:var(--radius-lg);padding:1.3rem;background:var(--surface);margin:2.5rem 0 0}.authorbox .avatar{width:64px;height:64px;border-radius:50%;flex:none;background:var(--navy-700);color:#fff;display:grid;place-items:center;font-weight:750;font-size:1.4rem}.authorbox .who{font-weight:700;color:var(--ink-900)}.authorbox .role{color:var(--amber-600);font-size:.85rem;font-weight:600}.authorbox p{font-size:.92rem;color:var(--ink-600);margin:.5rem 0 .3rem}.authorbox .links{display:flex;gap:.75rem;flex-wrap:wrap;font-size:.85rem}.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1rem 1.2rem;margin:1.5rem 0}.toc strong{display:block;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-500);margin-bottom:.5rem}.toc ol{margin:0;padding-left:1.1rem;font-size:.92rem}.toc a{color:var(--navy-600)}.related{border-top:1px solid var(--line);margin-top:2.5rem;padding-top:1.6rem}.related h2{font-size:1.2rem;margin-bottom:1rem}.faq details{border:1px solid var(--line);border-radius:var(--radius);padding:.2rem 1.1rem;margin:.6rem 0;background:#fff}.faq summary{cursor:pointer;font-weight:650;padding:.85rem 0;list-style:none;color:var(--ink-900)}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";float:right;color:var(--amber-500);font-weight:700}.faq details[open] summary:after{content:"–"}.faq details[open] summary{border-bottom:1px solid var(--line)}.faq details p{padding:.9rem 0;color:var(--ink-600);margin:0}.sec-head{max-width:640px;margin-bottom:2rem}.sec-head.center{margin-inline:auto}.tool{background:#fff;border:1px solid var(--line-strong);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-sm);margin:1.5rem 0}.tool label{display:block;font-weight:600;font-size:.9rem;margin:.9rem 0 .35rem;color:var(--ink-800)}.tool input,.tool select{width:100%;padding:.65rem .8rem;border:1px solid var(--line-strong);border-radius:var(--radius-sm);font-size:1rem;font-family:inherit;background:#fff;color:var(--ink-900)}.tool input:focus,.tool select:focus{border-color:var(--navy-500);outline:2px solid var(--blue-100)}.tool .result{margin-top:1.3rem;background:var(--navy-800);color:#fff;border-radius:var(--radius);padding:1.2rem 1.4rem}.tool .result .big{font-size:1.9rem;font-weight:800;color:#fff}.tool .result .row{display:flex;justify-content:space-between;padding:.35rem 0;border-bottom:1px solid rgba(255,255,255,.12);font-size:.95rem}.tool .result .row:last-child{border-bottom:0}.tool .grid2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}@media (max-width:520px){.tool .grid2{grid-template-columns:1fr}}.tool .note{font-size:.82rem;color:var(--ink-500);margin-top:.8rem}.stack>*+*{margin-top:1rem}.badge{display:inline-flex;align-items:center;gap:.4rem;background:var(--green-50);color:var(--green-600);font-weight:650;font-size:.8rem;padding:.25rem .6rem;border-radius:999px}.skip-link{position:absolute;left:-999px;top:0;background:#fff;padding:.6rem 1rem;z-index:100}.skip-link:focus{left:.5rem;top:.5rem}.letter-nav{display:flex;flex-wrap:wrap;gap:.3rem;margin:1.5rem 0}.letter-nav a{width:2rem;height:2rem;display:grid;place-items:center;border:1px solid var(--line);border-radius:6px;font-weight:650;font-size:.85rem;color:var(--navy-600)}.letter-nav a:hover{background:var(--navy-700);color:#fff;text-decoration:none}