/* DocBacked: mobile-first, WCAG AA. Every text/background pair below is >= 4.5:1. */
:root{
  --ink:#16202e; --ink-2:#3d4a5c; --bg:#ffffff; --bg-2:#f4f6f9; --line:#cfd6e0;
  --brand:#0a58a8; --brand-ink:#ffffff; --brand-dark:#073f79;
  --ok:#17663a; --ok-bg:#e8f5ec; --bad:#a32016; --bad-bg:#fdeceb; --warn-bg:#fff6dc; --warn-ink:#5c4300;
  --focus:#c25400; --radius:10px; --maxw:68rem;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);font-size:1.0625rem;line-height:1.6;color:var(--ink);background:var(--bg)}
img,svg{max-width:100%}
a{color:var(--brand);text-underline-offset:.15em}
a:hover{color:var(--brand-dark)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:4px}
h1,h2,h3{line-height:1.25;margin:1.4em 0 .5em}
h1{font-size:clamp(1.75rem,5vw,2.6rem);margin-top:.6em}
h2{font-size:clamp(1.3rem,3.5vw,1.7rem)}
h3{font-size:1.15rem}
p,ul,ol{margin:0 0 1em}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 1rem}
.narrow{max-width:46rem}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.6rem 1rem;z-index:10}
.skip:focus{left:.5rem;top:.5rem}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* header */
.site-header{border-bottom:1px solid var(--line);background:#fff}
.site-header .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.25rem 1rem;padding-top:.6rem;padding-bottom:.6rem}
.brand{display:inline-flex;align-items:center;gap:.5rem;font-weight:800;font-size:1.25rem;color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.brand svg{width:30px;height:30px;flex:none}
.site-nav ul{display:flex;flex-wrap:wrap;gap:.1rem .25rem;list-style:none;margin:0;padding:0}
.site-nav a{display:inline-block;padding:.55rem .6rem;min-height:44px;color:var(--ink);text-decoration:none;border-radius:6px;font-weight:600;font-size:.98rem}
.site-nav a:hover{background:var(--bg-2)}
.site-nav a[aria-current="page"]{color:var(--brand);text-decoration:underline;text-decoration-thickness:2px}
.unofficial{background:var(--warn-bg);color:var(--warn-ink);font-size:.9rem;padding:.45rem 0;border-bottom:1px solid #ecd9a0}
.unofficial p{margin:0}

/* hero + sections */
.hero{background:linear-gradient(180deg,#eef4fb 0,#fff 100%);padding:2rem 0 1.5rem}
.hero .lede{font-size:1.15rem;color:var(--ink-2);max-width:40rem}
.eyebrow{font-weight:700;color:var(--brand);text-transform:uppercase;letter-spacing:.06em;font-size:.85rem;margin:0}
section{padding:.5rem 0 1rem}
.grid{display:grid;gap:1rem;grid-template-columns:1fr}
@media (min-width:44rem){.grid-2{grid-template-columns:1fr 1fr}.grid-3{grid-template-columns:repeat(3,1fr)}}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem 1.2rem;background:#fff}
.card h3{margin-top:.2em}
.card.muted{background:var(--bg-2)}
.badge{display:inline-block;font-size:.8rem;font-weight:700;padding:.15rem .55rem;border-radius:999px;border:1px solid currentColor}
.badge.live{color:var(--ok)}
.badge.soon{color:var(--ink-2)}
.checklist{padding-left:1.2rem}
.checklist li{margin-bottom:.35rem}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;min-height:44px;padding:.6rem 1.15rem;border-radius:8px;border:2px solid var(--brand);background:var(--brand);color:var(--brand-ink);font:inherit;font-weight:700;text-decoration:none;cursor:pointer}
.btn:hover{background:var(--brand-dark);border-color:var(--brand-dark);color:#fff}
.btn.secondary{background:#fff;color:var(--brand)}
.btn.secondary:hover{background:var(--bg-2);color:var(--brand-dark)}
.btn[disabled],.btn[aria-disabled="true"]{background:#e6e9ee;border-color:#e6e9ee;color:#4a5566;cursor:not-allowed}
.actions{display:flex;flex-wrap:wrap;gap:.6rem;margin:1rem 0}

/* tables */
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:.98rem}
th,td{text-align:left;padding:.55rem .6rem;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--bg-2)}
td.num,th.num{text-align:right;white-space:nowrap}
caption{text-align:left;font-weight:700;padding:.4rem 0}

/* pricing */
.price{font-size:2rem;font-weight:800;margin:.2rem 0}
.price s{font-size:1.1rem;color:var(--ink-2);font-weight:600;margin-left:.4rem}
.small{font-size:.92rem;color:var(--ink-2)}

/* forms */
label{font-weight:600}
input[type=text],select,textarea{font:inherit;width:100%;padding:.6rem .7rem;border:2px solid #8a96a8;border-radius:8px;background:#fff;color:var(--ink);min-height:44px}
textarea{min-height:7rem}
.field{margin-bottom:1rem}
.hint{font-size:.92rem;color:var(--ink-2);margin:.2rem 0 .4rem}
fieldset{border:1px solid var(--line);border-radius:var(--radius);padding:.8rem 1rem 1rem;margin:0 0 1rem}
legend{font-weight:700;padding:0 .3rem}
.choice{display:flex;gap:.6rem;align-items:flex-start;padding:.35rem 0}
.choice input{margin-top:.35rem;width:1.15rem;height:1.15rem;flex:none}
.status{padding:.7rem 1rem;border-radius:8px;margin:1rem 0;border:1px solid var(--line)}
.status.ok{background:var(--ok-bg);color:var(--ok);border-color:#9fd1b1}
.status.bad{background:var(--bad-bg);color:var(--bad);border-color:#f0b4ae}
.status.info{background:var(--bg-2)}

/* quiz */
.quiz{padding-bottom:2rem}
.q-meta{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.3rem 1rem;color:var(--ink-2);font-size:.95rem;margin:.5rem 0}
.bar{height:8px;background:var(--bg-2);border-radius:99px;overflow:hidden;border:1px solid var(--line)}
.bar>span{display:block;height:100%;background:var(--brand)}
.q-head{margin:.8rem 0 .2rem;font-size:1.1rem}
.q-head:focus{outline:none}
.q-form fieldset{border:0;padding:0;margin:.4rem 0 0}
.q-form legend{font-weight:600;font-size:1.12rem;padding:0;margin-bottom:.7rem;line-height:1.5}
.opt{position:relative;margin:.55rem 0}
.opt input{position:absolute;opacity:0;width:1px;height:1px}
.opt label{display:flex;gap:.75rem;align-items:flex-start;padding:.8rem .9rem;border:2px solid var(--line);border-radius:var(--radius);cursor:pointer;font-weight:500;background:#fff;min-height:44px}
.opt label:hover{border-color:#8a96a8}
.opt .k{flex:none;display:inline-flex;align-items:center;justify-content:center;width:1.9rem;height:1.9rem;border-radius:50%;border:2px solid #8a96a8;font-weight:700;font-size:.95rem}
.opt input:checked+label{border-color:var(--brand);background:#eef4fb}
.opt input:checked+label .k{background:var(--brand);border-color:var(--brand);color:#fff}
.opt input:focus-visible+label{outline:3px solid var(--focus);outline-offset:2px}
.opt input:disabled+label{cursor:default}
.opt.is-correct input+label{border-color:var(--ok);background:var(--ok-bg)}
.opt.is-wrong input+label{border-color:var(--bad);background:var(--bad-bg)}
.opt.is-correct input:checked+label .k{background:var(--ok);border-color:var(--ok)}
.opt.is-wrong input:checked+label .k{background:var(--bad);border-color:var(--bad)}
.opt .verdict{display:block;font-weight:700;font-size:.9rem;margin-top:.15rem}
.opt.is-correct .verdict{color:var(--ok)}
.opt.is-wrong .verdict{color:var(--bad)}
.opt .why{display:block;font-weight:400;font-size:.95rem;color:var(--ink-2);margin-top:.2rem}
.feedback{margin-top:1rem}
.feedback .result{font-weight:800;font-size:1.1rem}
.feedback .result.ok{color:var(--ok)}
.feedback .result.bad{color:var(--bad)}
.source{border-left:4px solid var(--brand);background:var(--bg-2);padding:.8rem 1rem;border-radius:0 8px 8px 0;margin:1rem 0}
.source blockquote{margin:.4rem 0;font-style:italic}
.source .url{word-break:break-word}
.q-nav{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.2rem;align-items:center}
.q-nav .spacer{flex:1}
.linkish{background:none;border:0;padding:.5rem .2rem;font:inherit;color:var(--brand);text-decoration:underline;cursor:pointer;min-height:44px}
.timer{font-variant-numeric:tabular-nums;font-weight:700}
.navgrid{display:flex;flex-wrap:wrap;gap:.35rem;margin:1rem 0;padding:0;list-style:none}
.navgrid button{min-width:44px;min-height:44px;border:2px solid var(--line);background:#fff;border-radius:8px;font:inherit;font-weight:600;cursor:pointer;color:var(--ink)}
.navgrid button.answered{border-color:var(--brand);background:#eef4fb}
.navgrid button[aria-current="true"]{outline:3px solid var(--ink);outline-offset:1px}
.score{font-size:2.4rem;font-weight:800;margin:.2rem 0}
details{border:1px solid var(--line);border-radius:var(--radius);padding:.6rem .9rem;margin:.6rem 0;background:#fff}
summary{cursor:pointer;font-weight:600;min-height:32px}
dialog{border:1px solid var(--line);border-radius:12px;padding:1.2rem;max-width:34rem;width:calc(100% - 2rem)}
dialog::backdrop{background:rgba(10,20,30,.55)}

/* footer */
.site-footer{margin-top:3rem;border-top:1px solid var(--line);background:var(--bg-2);padding:1.5rem 0 2rem;font-size:.93rem;color:var(--ink-2)}
.site-footer .disclaimer{color:var(--ink);max-width:52rem}
.site-footer ul{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:.2rem 1.1rem}
.site-footer a{display:inline-block;padding:.35rem 0}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.site-header,.site-footer .links,.q-nav,.unofficial{display:none}}