:root{
  --bg:#f7f8fa; --panel:#ffffff; --border:#dfe3ea; --text:#1b2431; --muted:#5b6678;
  --brand:#0f3d5e; --brand-2:#135f8a; --accent:#c8781a; --link:#135f8a; --ok:#1c7c4c; --warn:#b3261e;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#101722; --panel:#17202d; --border:#27344a; --text:#e7ebf2; --muted:#9aa6ba;
         --brand:#9fd0f0; --brand-2:#7cc0ea; --accent:#f0a24a; --link:#8ec5ea; }
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--link)}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto}
header.site{background:var(--brand);color:#fff}
@media (prefers-color-scheme: dark){ header.site{background:#0b2a40} }
header.site .inner,footer.site .inner{max-width:66rem;margin:0 auto;padding:.8rem 16px;display:flex;align-items:center;justify-content:space-between;gap:.5rem 1.5rem;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.6rem;color:#fff;text-decoration:none;font-weight:700;font-size:1.35rem;letter-spacing:-.01em}
.brand .mark{width:30px;height:30px;border-radius:7px;background:linear-gradient(135deg,#f0a24a 0 50%,#ffffff 50%);flex-shrink:0}
.brand .word em{font-style:normal;font-weight:400;opacity:.7;font-size:.95rem}
nav.site{display:flex;flex-wrap:wrap;gap:.2rem 1.05rem;font-size:.93rem}
nav.site a{color:#fff;text-decoration:none;opacity:.92}
nav.site a:hover{color:#fff;opacity:1;text-decoration:underline}
main{max-width:66rem;margin:0 auto;padding:1.5rem 16px 3.5rem}
.narrow{max-width:46rem}
h1{font-size:2.1rem;line-height:1.2;margin:.4rem 0 .7rem;color:var(--brand);letter-spacing:-.01em}
h2{font-size:1.4rem;margin:2.2rem 0 .8rem;color:var(--brand)}
h2 a{color:inherit;text-decoration:none}
h3{font-size:1.1rem;margin:1.5rem 0 .4rem;color:var(--brand)}
p{margin:0 0 1rem}
.lede{font-size:1.12rem;color:var(--muted)}
ul,ol{padding-left:1.35rem;margin:0 0 1rem}
li{margin-bottom:.35rem}
.crumbs ol{list-style:none;padding:0;margin:0 0 .5rem;display:flex;flex-wrap:wrap;gap:.3rem;font-size:.85rem;color:var(--muted)}
.crumbs li+li::before{content:"›";margin-right:.3rem}
.crumbs a{color:var(--muted)}
.hero{padding:1.2rem 0 .5rem;max-width:50rem}
.hero h1{font-size:2.4rem}
.btn{display:inline-block;background:var(--brand-2);color:#fff;text-decoration:none;font-weight:600;font-size:.95rem;padding:.75rem 1.1rem;border-radius:.5rem;margin:.25rem .5rem .25rem 0;border:0;cursor:pointer}
.btn:hover{background:var(--accent);color:#fff}
.btn.ghost{background:transparent;color:var(--link);border:1px solid var(--border)}
.btn.amazon{background:#ffd814;color:#111}
.btn.amazon:hover{background:#f7ca00;color:#111}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(16rem,1fr));gap:1rem;margin:1rem 0}
.card{display:block;background:var(--panel);border:1px solid var(--border);border-radius:.6rem;padding:1rem 1.05rem;text-decoration:none;color:var(--text)}
.card strong{display:block;color:var(--brand);margin-bottom:.25rem;font-size:1.02rem;line-height:1.35}
.card span{display:block;font-size:.9rem;color:var(--muted);line-height:1.5}
.card:hover{border-color:var(--accent)}
.section-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(18rem,1fr));gap:.9rem;margin:1rem 0}
.section-list a{display:block;background:var(--panel);border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:.6rem;padding:1rem 1.1rem;text-decoration:none;color:var(--text)}
.section-list strong{display:block;color:var(--brand);font-size:1.08rem}
.section-list span{font-size:.92rem;color:var(--muted)}
.section-list a:hover{border-color:var(--brand-2)}
.guide-head{max-width:50rem;margin-bottom:1.2rem}
.kicker{margin:0;font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--accent);font-weight:700}
.kicker a{color:inherit;text-decoration:none}
.reviewed{font-size:.86rem;color:var(--muted);border-top:1px solid var(--border);padding-top:.6rem;margin-top:.4rem}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(13rem,1fr));gap:.7rem;margin:1.2rem 0 1.6rem;padding:0}
.facts div{background:var(--panel);border:1px solid var(--border);border-radius:.5rem;padding:.7rem .85rem}
.facts dt{font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:0 0 .2rem}
.facts dd{margin:0;font-weight:600;color:var(--text);line-height:1.4}
table.fees,table.plain{width:100%;border-collapse:collapse;margin:.5rem 0 1.4rem;font-size:.95rem}
table.fees th,table.fees td,table.plain th,table.plain td{text-align:left;vertical-align:top;padding:.6rem .55rem;border-bottom:1px solid var(--border)}
table.fees th,table.plain th{font-weight:600;background:var(--panel)}
table.fees td.amt{white-space:nowrap;font-weight:600;text-align:right}
table.fees th.amt{text-align:right}
table.fees td.note{color:var(--muted);font-size:.88rem}
.steps{counter-reset:s;list-style:none;padding:0}
.steps li{counter-increment:s;position:relative;padding-left:2.6rem;margin-bottom:1rem}
.steps li::before{content:counter(s);position:absolute;left:0;top:.05rem;width:1.9rem;height:1.9rem;border-radius:50%;background:var(--brand-2);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:.9rem}
.steps li strong{display:block;color:var(--brand)}
.notice{background:var(--panel);border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:.6rem;padding:1rem 1.2rem;margin:2.2rem 0 1rem}
.notice h2{margin:0 0 .5rem;font-size:1.05rem}
.notice p{margin:0;font-size:.95rem}
.callout{background:rgba(19,95,138,.08);border:1px solid var(--border);border-radius:.6rem;padding:.9rem 1.1rem;margin:1.2rem 0;font-size:.97rem}
.callout.warn{background:rgba(179,38,30,.07);border-color:rgba(179,38,30,.35)}
.callout.warn strong{color:var(--warn)}
.callout p:last-child{margin:0}
.related h2{margin-top:2.5rem}
.sources{font-size:.88rem;word-break:break-word}
.buy{background:var(--panel);border:1px solid var(--border);border-radius:.6rem;padding:1rem 1.1rem;margin:1.4rem 0}
.buy strong{display:block;color:var(--brand);margin-bottom:.3rem}
.buy p{margin:0 0 .6rem;font-size:.95rem}
.fine{font-size:.8rem;color:var(--muted)}
form.contact label{display:block;font-weight:600;font-size:.92rem;margin:.9rem 0 .3rem}
form.contact input,form.contact textarea{width:100%;font:1rem system-ui,sans-serif;padding:.6rem .7rem;border:1px solid var(--border);border-radius:.4rem;background:var(--panel);color:var(--text)}
form.contact textarea{min-height:9rem}
form.contact button{margin-top:1rem}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.ok{background:rgba(28,124,76,.1);border:1px solid var(--ok);padding:.8rem 1rem;border-radius:.5rem}
.err{background:rgba(179,38,30,.08);border:1px solid var(--warn);padding:.8rem 1rem;border-radius:.5rem}
.where{font-size:.85rem;color:var(--muted)}
dl.gloss dt{font-weight:700;color:var(--brand);margin-top:1rem}
dl.gloss dd{margin:0 0 .4rem}
/* practice test */
.quiz{background:var(--panel);border:1px solid var(--border);border-radius:.7rem;padding:1.2rem 1.3rem;margin:1.2rem 0}
.quiz .bar{display:flex;justify-content:space-between;align-items:center;font-size:.9rem;color:var(--muted);margin-bottom:.8rem;gap:1rem;flex-wrap:wrap}
.quiz .timer{font-variant-numeric:tabular-nums;font-weight:700;color:var(--brand)}
.quiz .q{font-size:1.12rem;font-weight:600;margin:.4rem 0 .9rem;line-height:1.45}
.quiz .opts{list-style:none;padding:0;margin:0}
.quiz .opts li{margin:0 0 .55rem}
.quiz .opts button{width:100%;text-align:left;font:1rem system-ui,sans-serif;padding:.7rem .9rem;border:1px solid var(--border);border-radius:.5rem;background:var(--bg);color:var(--text);cursor:pointer}
.quiz .opts button:hover{border-color:var(--brand-2)}
.quiz .opts button.sel{border-color:var(--brand-2);background:rgba(19,95,138,.1)}
.quiz .opts button.right{border-color:var(--ok);background:rgba(28,124,76,.12)}
.quiz .opts button.wrong{border-color:var(--warn);background:rgba(179,38,30,.1)}
.quiz .explain{font-size:.95rem;color:var(--muted);border-left:3px solid var(--accent);padding:.3rem .8rem;margin:.9rem 0}
.quiz .score{font-size:1.5rem;font-weight:700;color:var(--brand)}
.quiz .pass{color:var(--ok)}
.quiz .fail{color:var(--warn)}
.quiz .review li{margin-bottom:.8rem}
footer.site{border-top:1px solid var(--border);color:var(--muted);font-size:.88rem;line-height:1.6;margin-top:2rem}
footer.site .inner{display:block;padding:1.5rem 16px}
footer.site p{margin:0 0 .6rem}
footer.site a{color:var(--muted)}
@media (max-width:560px){ h1{font-size:1.65rem} .hero h1{font-size:1.85rem} body{font-size:16px} table.fees td.note{display:none} }