styles.css

/*!
 * Public AI Utility Toolkit — styles.css
 * Design tokens, light/dark/high-contrast themes, components and print styles.
 * Targets WCAG 2.2 AA: 4.5:1 text contrast, 3:1 non-text, visible focus, reflow to 320px.
 * Licence: MIT (code) / Open Government Licence v3.0 (content).
 */

/* Progressive enhancement: controls that need JavaScript are hidden until it loads. */
html:not(.js) .js-only { display: none !important; }


:root{
  --c-bg:#ffffff; --c-bg-alt:#f4f6f9; --c-bg-sunken:#eef1f6; --c-surface:#ffffff;
  --c-text:#0b0c0c; --c-text-muted:#4c5561; --c-border:#c9ced6; --c-border-strong:#8c95a1;
  --c-brand:#0b3d91; --c-brand-ink:#082e6e; --c-brand-soft:#e8eefb;
  --c-accent:#00703c; --c-accent-soft:#e3f2ea;
  --c-warn:#8a5300; --c-warn-soft:#fdf3e2; --c-danger:#94261f; --c-danger-soft:#fbeceb;
  --c-focus:#ffdd00; --c-focus-ink:#0b0c0c;
  --radius:10px; --radius-sm:6px;
  --shadow:0 1px 2px rgba(11,12,12,.08),0 8px 24px rgba(11,12,12,.06);
  --shadow-lg:0 2px 6px rgba(11,12,12,.10),0 18px 48px rgba(11,12,12,.12);
  --maxw:1200px; --gap:24px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --fs-base:17px;
}
html[data-theme="dark"]{
  --c-bg:#0e1116; --c-bg-alt:#141922; --c-bg-sunken:#0a0d12; --c-surface:#161c26;
  --c-text:#eef2f7; --c-text-muted:#aeb8c6; --c-border:#2c3542; --c-border-strong:#485465;
  --c-brand:#8ab4ff; --c-brand-ink:#b9d1ff; --c-brand-soft:#16233c;
  --c-accent:#5ed6a0; --c-accent-soft:#10281e;
  --c-warn:#ffc266; --c-warn-soft:#2a2013; --c-danger:#ff9a92; --c-danger-soft:#2c1614;
  --shadow:0 1px 2px rgba(0,0,0,.5),0 8px 24px rgba(0,0,0,.35);
  --shadow-lg:0 2px 6px rgba(0,0,0,.55),0 18px 48px rgba(0,0,0,.45);
}
html[data-contrast="high"]{
  --c-bg:#000; --c-bg-alt:#000; --c-bg-sunken:#000; --c-surface:#000;
  --c-text:#fff; --c-text-muted:#fff; --c-border:#fff; --c-border-strong:#fff;
  --c-brand:#ffff00; --c-brand-ink:#ffff00; --c-brand-soft:#000;
  --c-accent:#00ff90; --c-accent-soft:#000; --c-warn:#ffcc00; --c-warn-soft:#000;
  --c-danger:#ff6b6b; --c-danger-soft:#000; --shadow:none; --shadow-lg:none;
}
html[data-contrast="high"] *{border-color:#fff !important;}
html{font-size:var(--fs-base); scroll-behavior:smooth; scroll-padding-top:96px; -webkit-text-size-adjust:100%;}
html[data-density="comfortable"]{--fs-base:18px;}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}}
body{margin:0;background:var(--c-bg);color:var(--c-text);font-family:var(--font);line-height:1.55;font-size:1rem;}
*,*::before,*::after{box-sizing:border-box}
img{max-width:100%;height:auto}
a{color:var(--c-brand);text-underline-offset:3px}
a:hover{color:var(--c-brand-ink)}
:focus-visible{outline:3px solid var(--c-focus);outline-offset:2px;box-shadow:0 0 0 5px rgba(11,12,12,.35);border-radius:2px}
h1,h2,h3,h4{line-height:1.2;margin:0 0 .5em;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,1.2rem + 2.6vw,3.1rem)}
h2{font-size:clamp(1.5rem,1.1rem + 1.5vw,2.1rem)}
h3{font-size:1.16rem}
h4{font-size:1.02rem}
p{margin:0 0 1em;max-width:74ch}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:0;z-index:200;background:var(--c-focus);color:#0b0c0c;padding:12px 18px;font-weight:700;border-radius:0 0 var(--radius-sm) 0}
.skip-link:focus{left:0}
/* header */
.site-header{position:sticky;top:0;z-index:100;background:var(--c-surface);border-bottom:1px solid var(--c-border);backdrop-filter:saturate(1.2) blur(6px)}
.hdr{display:flex;align-items:center;gap:14px;padding:10px 0;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--c-text);text-decoration:none;font-size:1.02rem}
.brand .mark{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--c-brand),var(--c-accent));display:grid;place-items:center;color:#fff;font-size:.8rem;flex:0 0 auto}
.brand small{display:block;font-weight:500;font-size:.7rem;color:var(--c-text-muted);letter-spacing:.06em;text-transform:uppercase}
.top-nav{display:flex;gap:2px;flex-wrap:wrap;margin-left:auto;align-items:center}
.top-nav a{padding:8px 10px;border-radius:var(--radius-sm);text-decoration:none;color:var(--c-text);font-size:.9rem;font-weight:600}
.top-nav a:hover{background:var(--c-brand-soft);color:var(--c-brand-ink)}
.top-nav a[aria-current="true"]{background:var(--c-brand-soft);color:var(--c-brand-ink);box-shadow:inset 0 -3px 0 var(--c-brand)}
.hdr-tools{display:flex;gap:6px;align-items:center}
.icon-btn{border:1px solid var(--c-border);background:var(--c-surface);color:var(--c-text);border-radius:var(--radius-sm);padding:7px 10px;font:inherit;font-size:.82rem;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.icon-btn:hover{background:var(--c-bg-alt);border-color:var(--c-border-strong)}
.icon-btn[aria-pressed="true"]{background:var(--c-brand-soft);border-color:var(--c-brand);color:var(--c-brand-ink)}
.nav-toggle{display:none}
#read-progress{position:fixed;top:0;left:0;height:4px;width:0;background:linear-gradient(90deg,var(--c-brand),var(--c-accent));z-index:150}
/* layout */
main{display:block}
.section{padding:56px 0;border-top:1px solid var(--c-border)}
.section.alt{background:var(--c-bg-alt)}
.eyebrow{display:inline-block;font-size:.74rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--c-brand);background:var(--c-brand-soft);padding:5px 10px;border-radius:999px;margin-bottom:12px}
.lede{font-size:1.1rem;color:var(--c-text-muted);max-width:76ch}
.grid{display:grid;gap:var(--gap)}
.g2{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(215px,1fr))}
.card{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:8px}
.card h3{margin:0}
.card p{margin:0;font-size:.94rem;color:var(--c-text-muted)}
.card--link{text-decoration:none;color:inherit;transition:transform .15s ease,box-shadow .15s ease}
.card--link:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--c-brand)}
.tag{display:inline-block;font-size:.7rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:3px 8px;border-radius:999px;border:1px solid var(--c-border);color:var(--c-text-muted);background:var(--c-bg-alt)}
.tag.t-gov{color:var(--c-brand);background:var(--c-brand-soft);border-color:var(--c-brand)}
.tag.t-ok{color:var(--c-accent);background:var(--c-accent-soft);border-color:var(--c-accent)}
.tag.t-warn{color:var(--c-warn);background:var(--c-warn-soft);border-color:var(--c-warn)}
.tag.t-risk{color:var(--c-danger);background:var(--c-danger-soft);border-color:var(--c-danger)}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:var(--radius-sm);font-weight:700;text-decoration:none;border:2px solid transparent;cursor:pointer;font:inherit;font-weight:700}
.btn-primary{background:var(--c-brand);color:#fff;box-shadow:0 3px 0 var(--c-brand-ink)}
.btn-primary:hover{background:var(--c-brand-ink);color:#fff}
.btn-secondary{background:var(--c-surface);color:var(--c-text);border-color:var(--c-border-strong)}
.btn-secondary:hover{background:var(--c-bg-alt)}
.btn-sm{padding:7px 12px;font-size:.85rem}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin:18px 0}
ul.clean{list-style:none;padding:0;margin:0;display:grid;gap:8px}
ul.ticks{list-style:none;padding:0;margin:0;display:grid;gap:10px}
ul.ticks li{padding-left:30px;position:relative;font-size:.95rem}
ul.ticks li::before{content:"";position:absolute;left:0;top:.35em;width:16px;height:16px;border-radius:50%;background:var(--c-accent-soft);border:2px solid var(--c-accent)}
.callout{border-left:6px solid var(--c-brand);background:var(--c-brand-soft);padding:16px 18px;border-radius:0 var(--radius) var(--radius) 0}
.callout.warn{border-color:var(--c-warn);background:var(--c-warn-soft)}
.callout.ok{border-color:var(--c-accent);background:var(--c-accent-soft)}
.callout.risk{border-color:var(--c-danger);background:var(--c-danger-soft)}
.callout p:last-child{margin-bottom:0}
table{width:100%;border-collapse:collapse;font-size:.92rem;background:var(--c-surface)}
caption{text-align:left;font-weight:700;padding:10px 0;color:var(--c-text-muted);font-size:.9rem}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--c-border);vertical-align:top}
thead th{background:var(--c-bg-alt);border-bottom:2px solid var(--c-border-strong);position:sticky;top:70px;z-index:2}
tbody tr:hover{background:var(--c-bg-alt)}
.table-scroll{overflow-x:auto;border:1px solid var(--c-border);border-radius:var(--radius)}
code,kbd,pre{font-family:var(--mono)}
kbd{border:1px solid var(--c-border-strong);border-bottom-width:2px;border-radius:4px;padding:1px 6px;font-size:.8rem;background:var(--c-bg-alt)}
pre{background:var(--c-bg-sunken);border:1px solid var(--c-border);border-radius:var(--radius);padding:16px;overflow:auto;font-size:.84rem;line-height:1.5;margin:0}
.code-block{position:relative}
.code-block .copy{position:absolute;top:8px;right:8px}
label{font-weight:600;display:block;margin-bottom:6px;font-size:.92rem}
.hint{font-weight:400;color:var(--c-text-muted);font-size:.85rem;display:block;margin-bottom:6px}
input[type=text],input[type=search],input[type=number],select,textarea{width:100%;padding:11px 12px;border:2px solid var(--c-border-strong);border-radius:var(--radius-sm);font:inherit;font-size:.95rem;background:var(--c-surface);color:var(--c-text)}
textarea{min-height:110px;resize:vertical}
fieldset{border:1px solid var(--c-border);border-radius:var(--radius);padding:16px;margin:0 0 16px}
legend{font-weight:700;padding:0 8px}
.field{margin-bottom:16px}
.radio,.check{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;border:1px solid transparent;border-radius:var(--radius-sm)}
.radio:hover,.check:hover{background:var(--c-bg-alt)}
.radio input,.check input{width:22px;height:22px;margin:2px 0 0;flex:0 0 auto;accent-color:var(--c-brand)}
.radio label,.check label{font-weight:500;margin:0;font-size:.95rem}
details{border:1px solid var(--c-border);border-radius:var(--radius);background:var(--c-surface);margin-bottom:10px;overflow:hidden}
details[open]{box-shadow:var(--shadow)}
summary{cursor:pointer;padding:14px 18px;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:1.3rem;font-weight:700;color:var(--c-brand);flex:0 0 auto}
details[open] summary::after{content:"−"}
summary:hover{background:var(--c-bg-alt)}
.details-body{padding:0 18px 18px;border-top:1px solid var(--c-border);padding-top:14px}
.stat{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius);padding:18px;text-align:left}
.stat .num{font-size:2rem;font-weight:800;color:var(--c-brand);display:block;line-height:1}
.stat .lbl{font-size:.86rem;color:var(--c-text-muted)}
.toc{position:sticky;top:88px;align-self:start;border:1px solid var(--c-border);border-radius:var(--radius);padding:16px;background:var(--c-surface);font-size:.9rem}
.toc ol{margin:0;padding-left:18px;display:grid;gap:6px}
.layout-side{display:grid;grid-template-columns:260px 1fr;gap:32px}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.chip{border:1px solid var(--c-border-strong);background:var(--c-surface);color:var(--c-text);border-radius:999px;padding:7px 14px;font-size:.85rem;font-weight:600;cursor:pointer;font-family:inherit}
.chip[aria-pressed="true"]{background:var(--c-brand);color:#fff;border-color:var(--c-brand)}
.chip:hover{border-color:var(--c-brand)}
mark{background:var(--c-focus);color:#0b0c0c;padding:0 2px}
.site-footer{background:var(--c-bg-sunken);border-top:4px solid var(--c-brand);padding:44px 0 28px;font-size:.9rem}
.site-footer h2{font-size:1rem}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:26px;margin-bottom:26px}
.footer-grid ul{list-style:none;padding:0;margin:0;display:grid;gap:7px}
.meta-bar{display:flex;flex-wrap:wrap;gap:10px 20px;padding-top:18px;border-top:1px solid var(--c-border);color:var(--c-text-muted)}
.back-to-top{position:fixed;right:18px;bottom:18px;z-index:90;border-radius:999px;box-shadow:var(--shadow-lg)}
.result-box{background:var(--c-bg-sunken);border:1px solid var(--c-border);border-radius:var(--radius);padding:18px;margin-top:16px}
.badge-h{display:inline-block;font-weight:800;padding:4px 10px;border-radius:6px;background:var(--c-brand);color:#fff;font-size:.85rem}
.steps{counter-reset:s;display:grid;gap:14px;padding:0;list-style:none;margin:0}
.steps li{counter-increment:s;position:relative;padding-left:52px;background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius);padding:16px 16px 16px 60px}
.steps li::before{content:counter(s);position:absolute;left:16px;top:16px;width:30px;height:30px;border-radius:50%;background:var(--c-brand);color:#fff;display:grid;place-items:center;font-weight:800;font-size:.9rem}
.moscow-M{border-left:6px solid var(--c-danger)}
.moscow-S{border-left:6px solid var(--c-warn)}
.moscow-C{border-left:6px solid var(--c-brand)}
.moscow-W{border-left:6px solid var(--c-border-strong)}
.status-live{color:var(--c-accent);font-weight:700}
.count-note{font-size:.88rem;color:var(--c-text-muted);margin:8px 0}
@media (max-width:900px){
 .layout-side{grid-template-columns:1fr}
 .toc{position:static}
 .nav-toggle{display:inline-flex}
 .top-nav{width:100%;order:5;flex-direction:column;align-items:stretch;display:none;margin:8px 0 4px}
 .top-nav.open{display:flex}
 .top-nav a{padding:12px}
 thead th{position:static}
}
@media print{
 .site-header,.hdr-tools,.back-to-top,#read-progress,.chip-row,.skip-link,.no-print{display:none!important}
 body{font-size:11pt;background:#fff;color:#000}
 .section{padding:14pt 0;border:none;page-break-inside:avoid}
 details{border:none} details .details-body{display:block!important}
 a[href^="http"]::after{content:" (" attr(href) ")";font-size:8pt;color:#444;word-break:break-all}
 .card{box-shadow:none;border:1pt solid #999}
}


/* Forced-colours / Windows High Contrast support */
@media (forced-colors: active) {
  .btn, .icon-btn, .chip, .card, .callout, details { border: 1px solid CanvasText; }
  .badge-h, .tag { forced-color-adjust: none; border: 1px solid CanvasText; }
  :focus-visible { outline: 3px solid Highlight; }
}

/* Respect a user's request for reduced data / low bandwidth */
@media (prefers-reduced-data: reduce) {
  .card--link { transition: none; }
}