:root{--ink:#16202c;--muted:#4a5868;--navy:#0f2742;--teal:#0b6b74;--teal-2:#0e7c86;--line:#d9e1e8;--bg:#ffffff;--soft:#f3f6f9;--warn:#7a4a00;--warn-bg:#fff6e5;--ok-bg:#eaf6f6;--maxw:1120px;--read:760px}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;overflow-wrap:break-word}
a{color:var(--teal);text-underline-offset:2px}
a:hover{color:var(--navy)}
:focus-visible{outline:3px solid var(--teal-2);outline-offset:2px}
.skip{position:absolute;left:-9999px;top:0;background:var(--navy);color:#fff;padding:.5rem 1rem;z-index:10}
.skip:focus{left:1rem;top:1rem}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 16px}
.site-header{border-bottom:1px solid var(--line);background:#fff}
.hdr{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1.5rem;padding-top:.75rem;padding-bottom:.75rem}
.brand{display:inline-flex;align-items:center;gap:.5rem;font-weight:700;font-size:1.2rem;color:var(--navy);text-decoration:none}
.brand .tld{color:var(--teal)}
.nav ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.25rem .4rem}
.nav a{display:inline-block;padding:.35rem .6rem;border-radius:6px;color:var(--ink);text-decoration:none;font-size:.95rem}
.nav a:hover{background:var(--soft)}
.nav a[aria-current=page]{background:var(--navy);color:#fff}
.crumbs{font-size:.88rem;color:var(--muted);margin:1rem 0 0}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.25rem}
.crumbs li+li::before{content:"›";margin:0 .35rem 0 .1rem;color:#8a97a5}
.crumbs a{color:var(--muted)}
.page{max-width:var(--read);margin:0 auto;padding:1.25rem 0 3rem}
.page.wide{max-width:var(--maxw)}
h1{font-size:clamp(1.65rem,1.2rem + 2.2vw,2.35rem);line-height:1.2;color:var(--navy);margin:.6rem 0 .9rem;letter-spacing:-.01em}
h2{font-size:clamp(1.3rem,1.1rem + 1vw,1.6rem);line-height:1.3;color:var(--navy);margin:2.4rem 0 .7rem}
h3{font-size:1.15rem;line-height:1.35;margin:1.6rem 0 .5rem;color:var(--navy)}
p,ul,ol,dl{margin:0 0 1rem}
li{margin:.25rem 0}
.bluf{font-size:1.12rem;line-height:1.6;border-left:4px solid var(--teal-2);background:var(--ok-bg);padding:.9rem 1rem;border-radius:0 8px 8px 0;margin:0 0 1rem}
.proof-status{font-size:.98rem;background:var(--warn-bg);color:var(--warn);border:1px solid #f0d9a8;border-radius:8px;padding:.6rem .85rem;margin:0 0 1rem}
.proof-status strong{color:#5c3700}
.toc{border:1px solid var(--line);border-radius:10px;padding:.8rem 1rem;margin:0 0 1.5rem;font-size:.95rem;background:#fff}
.toc-h{font-weight:700;color:var(--navy);margin:0 0 .3rem}
.toc ol{margin:0;padding-left:1.2rem}
.toc li{margin:.15rem 0}
.byline{font-size:.92rem;color:var(--muted);margin:0 0 1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--line)}
.byline a{color:var(--muted)}
.ans{font-weight:500}
.tbl{width:100%;overflow-x:auto;margin:0 0 1.25rem;border:1px solid var(--line);border-radius:8px}
table{border-collapse:collapse;width:100%;font-size:.94rem;line-height:1.5}
caption{caption-side:top;text-align:left;font-weight:600;color:var(--navy);padding:.7rem .8rem .5rem;font-size:.95rem;position:sticky;left:0;max-width:calc(100vw - 34px)}
th,td{text-align:left;vertical-align:top;padding:.55rem .8rem;border-top:1px solid var(--line)}
thead th{background:var(--soft);border-top:0;font-weight:600}
tbody th{font-weight:600}
.limits{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:1rem 1.1rem;margin:1.5rem 0}
.limits h2{margin-top:.2rem}
.callout{border:1px solid var(--line);border-radius:10px;padding:1rem 1.1rem;margin:1.5rem 0}
.cta{background:var(--navy);color:#fff;border-radius:12px;padding:1.2rem 1.25rem;margin:2rem 0}
.cta p{margin:.3rem 0 .8rem}
.cta a.btn{background:#fff;color:var(--navy)}
.btn{display:inline-block;background:var(--teal);color:#fff;text-decoration:none;font-weight:600;padding:.65rem 1rem;border-radius:8px;margin:.2rem .4rem .2rem 0}
.btn:hover{color:#fff;background:var(--navy)}
.btn.alt{background:transparent;color:inherit;border:1px solid currentColor}
.cta .btn.alt{color:#fff}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:1rem;margin:1rem 0 1.5rem;padding:0;list-style:none}
.cards>li{border:1px solid var(--line);border-radius:10px;padding:1rem 1.1rem;margin:0;background:#fff}
.cards h3{margin-top:0}
.cards .st{display:inline-block;font-size:.82rem;background:var(--warn-bg);color:var(--warn);border-radius:999px;padding:.1rem .55rem;margin:0 0 .5rem}
ol.steps{counter-reset:s;list-style:none;padding:0}
ol.steps>li{counter-increment:s;position:relative;padding-left:2.4rem;margin:.75rem 0}
ol.steps>li::before{content:counter(s);position:absolute;left:0;top:.05rem;width:1.7rem;height:1.7rem;border-radius:50%;background:var(--navy);color:#fff;font-size:.9rem;font-weight:700;display:flex;align-items:center;justify-content:center}
dl.terms dt{font-weight:700;color:var(--navy);margin-top:.8rem}
dl.terms dd{margin:0 0 .4rem}
img{max-width:100%;height:auto}
figure{margin:1.5rem 0}
figure img{display:block;border:1px solid var(--line);border-radius:10px;background:#fff}
figure svg{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:10px;background:#fff}
figcaption{font-size:.9rem;color:var(--muted);margin-top:.5rem}
pre,code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.88em}
pre{max-width:100%;background:var(--soft);border:1px solid var(--line);border-radius:8px;padding:.8rem;overflow-x:auto;white-space:pre}
cite{font-style:normal}
.sources{font-size:.9rem;color:var(--muted)}
.sources li{margin:.35rem 0}
.note{font-size:.92rem;color:var(--muted)}
.site-footer{background:var(--navy);color:#dbe4ee;font-size:.92rem;margin-top:2rem}
.foot{padding-top:1.75rem;padding-bottom:1.75rem}
.site-footer a{color:#fff}
.site-footer address{font-style:normal;display:flex;flex-direction:column;gap:.2rem;margin:.6rem 0 1rem}
.foot-links{list-style:none;padding:0;margin:0 0 1rem;display:flex;flex-wrap:wrap;gap:.25rem 1rem}
.tm,.copy{font-size:.84rem;color:#b9c6d3;margin:.4rem 0 0}
@media (max-width:640px){body{font-size:16px}.hdr{flex-direction:column;align-items:flex-start}.nav a{padding:.3rem .5rem;font-size:.9rem}th,td{padding:.5rem .6rem}}
@media print{.site-header nav,.cta,.skip{display:none}body{font-size:12pt}}