:root{--blue:#1F4E9A;--blue-d:#163A72;--ink:#1B2230;--mute:#5A6270;--bg:#F4F6F8;--card:#fff;--line:#D6DBE2;--yellow:#F2C400;--max:72rem;--prose:72ch;--r:6px}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;font:400 1.0625rem/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--blue);text-underline-offset:.15em}
a:hover{color:var(--blue-d)}
:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}
h1,h2,h3{line-height:1.15;letter-spacing:-.01em;margin:0 0 .5em}
h1{font-size:clamp(1.9rem,4.5vw,2.75rem);font-weight:800}
h2{font-size:clamp(1.4rem,3vw,1.75rem);font-weight:750;margin-top:2.2em;padding-top:.6em;border-top:2px solid var(--line)}
h3{font-size:1.15rem;font-weight:700;margin-top:1.6em}
p,ul,ol,table{margin:0 0 1.1em}
img,svg{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 1.25rem}
.prose{max-width:var(--prose)}
.skip{position:absolute;left:-999px;top:0;background:var(--yellow);color:var(--ink);padding:.5rem 1rem;z-index:99}
.skip:focus{left:1rem;top:1rem}
/* header */
.top{background:#fff;border-bottom:3px solid var(--blue)}
.top .wrap{display:flex;align-items:center;gap:1rem;min-height:3.75rem;flex-wrap:wrap}
.logo{font-weight:800;font-size:1.35rem;text-decoration:none;color:var(--ink);letter-spacing:-.02em;display:flex;align-items:center;gap:.5rem}
.logo b{display:inline-block;width:1.6rem;height:1.6rem;background:var(--blue);border:2px solid #fff;box-shadow:0 0 0 2px var(--blue);border-radius:3px}
.menu-btn{margin-left:auto;background:none;border:2px solid var(--line);border-radius:var(--r);padding:.45rem .8rem;font:inherit;font-weight:600;color:var(--ink);cursor:pointer}
.nav{display:none;width:100%;padding-bottom:.75rem}
.nav ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:.25rem .75rem}
.nav a{display:block;padding:.4rem .2rem;text-decoration:none;font-weight:600;color:var(--ink);border-bottom:1px solid var(--line)}
.nav a[aria-current]{color:var(--blue)}
.nav.open{display:block}
.no-js .nav{display:block}.no-js .menu-btn{display:none}
@media(min-width:64rem){.menu-btn{display:none}.top .wrap{min-height:0}.logo{padding:.7rem 0}.nav{display:block;width:100%;margin:0;padding:0;border-top:1px solid var(--line)}.nav ul{display:flex;gap:0;justify-content:space-between}.nav a{border:0;padding:.7rem .2rem;font-size:.92rem;white-space:nowrap}.nav a[aria-current]{box-shadow:inset 0 -3px 0 var(--blue)}}
/* breadcrumb */
.crumb{font-size:.9rem;color:var(--mute);margin:1rem 0 1.5rem}
.crumb ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.35rem}
.crumb li+li::before{content:"›";margin-right:.35rem}
/* hero sign */
.sign{background:var(--blue);color:#fff;border:.5rem solid #fff;outline:3px solid var(--blue);border-radius:10px;padding:1.5rem;margin:1.5rem 0 2.5rem}
.sign h1,.sign h2{color:#fff;border:0;margin-top:0;padding-top:0}
.sign p{color:#E4ECF9;max-width:60ch}
.sign ul{list-style:none;margin:1.25rem 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(14rem,1fr));gap:.4rem}
.sign li a{display:block;color:#fff;text-decoration:none;font-weight:700;font-size:1.05rem;padding:.6rem .8rem;border-left:4px solid #fff;background:rgba(255,255,255,.06)}
.sign li a:hover,.sign li a:focus-visible{background:#fff;color:var(--blue)}
.sign li small{display:block;font-weight:400;font-size:.85rem;opacity:.85}
/* chapo, toc */
.chapo{font-size:1.2rem;color:#2C3444;max-width:66ch}
.toc{border:2px solid var(--line);border-radius:var(--r);padding:1rem 1.25rem;background:#fff;margin:1.5rem 0 2rem}
.toc strong{display:block;margin-bottom:.4rem}
.toc ol{margin:0;padding-left:1.25rem;columns:2;column-gap:2rem}
@media(max-width:40rem){.toc ol{columns:1}}
/* tables */
table{width:100%;border-collapse:collapse;font-size:.95rem;background:#fff}
th,td{text-align:left;padding:.55rem .7rem;border:1px solid var(--line);vertical-align:top}
th{background:#E9EEF6;font-weight:700}
.tbl{overflow-x:auto;margin-bottom:1.2em}
/* affiliate */
.aff{border:2px solid var(--yellow);border-radius:var(--r);background:#fff;padding:1rem 1.25rem;margin:1.5rem 0}
.aff h3{margin-top:0;display:flex;gap:.5rem;align-items:center}
.aff h3::before{content:"";width:.9rem;height:.9rem;background:var(--yellow);border-radius:2px;flex:none}
.aff ul{margin:0;padding:0;list-style:none;display:grid;gap:.5rem}
.aff li a{display:flex;justify-content:space-between;gap:1rem;align-items:center;padding:.6rem .8rem;border:1px solid var(--line);border-radius:var(--r);text-decoration:none;font-weight:600}
.aff li a span{color:var(--mute);font-weight:400;font-size:.9rem}
.aff li a:hover{border-color:var(--blue);background:#F5F8FD}
.aff small,.disc{display:block;color:var(--mute);font-size:.82rem;margin-top:.6rem}
/* subpage index */
.idx{display:grid;grid-template-columns:repeat(auto-fill,minmax(19rem,1fr));gap:1.25rem 2rem;margin:1rem 0 2rem}
.idx h3{margin-top:0;padding-bottom:.3rem;border-bottom:2px solid var(--blue)}
.idx ul{list-style:none;margin:0;padding:0}
.idx li{padding:.35rem 0;border-bottom:1px solid var(--line)}
.idx li a{font-weight:600;text-decoration:none}
.idx li a:hover{text-decoration:underline}
.idx li small{display:block;color:var(--mute);font-size:.85rem}
/* home hub blocks */
.hubs{display:grid;grid-template-columns:repeat(auto-fill,minmax(20rem,1fr));gap:1.25rem;margin:1.5rem 0}
.hub{background:#fff;border:2px solid var(--line);border-radius:var(--r);padding:1.1rem 1.25rem}
.hub h3{margin-top:0}
.hub h3 a{text-decoration:none}
.hub p{font-size:.95rem;margin-bottom:.6rem}
.hub ul{list-style:none;margin:0;padding:0;font-size:.92rem}
.hub li{display:inline}
.hub li+li::before{content:" · ";color:var(--mute)}
/* faq */
.faq details{border:1px solid var(--line);border-radius:var(--r);background:#fff;margin-bottom:.5rem;padding:0 1rem}
.faq summary{cursor:pointer;font-weight:700;padding:.75rem 0}
.faq details p{margin:0 0 .9rem}
.faq details[open] summary{border-bottom:1px solid var(--line);margin-bottom:.5rem}
/* related */
.rel{margin:2.5rem 0 1rem;padding:1rem 1.25rem;background:#E9EEF6;border-radius:var(--r)}
.rel ul{margin:.3rem 0 0;padding-left:1.2rem}
/* footer */
.foot{margin-top:4rem;background:var(--ink);color:#C9D0DB;font-size:.9rem}
.foot .wrap{padding:2rem 1.25rem}
.foot a{color:#fff}
.foot .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));gap:1.5rem}
.foot ul{list-style:none;margin:0;padding:0}
.foot li{padding:.15rem 0}
.foot .legal{margin-top:1.5rem;padding-top:1rem;border-top:1px solid #3A4352;font-size:.82rem}
.plan h2{border:0;margin-top:2em}
.plan ul{columns:2;column-gap:2rem;padding-left:1.2rem}
@media(max-width:40rem){.plan ul{columns:1}}
.note{border-left:4px solid var(--blue);background:#fff;padding:.75rem 1rem;margin:1.2em 0}