/* ==========================================================================
   Доступная среда — дизайн-система. Mobile-first, WCAG AA.
   Ниша = доступность → сам сайт эталон: контраст, фокус, тач ≥44px, клавиатура.
   ========================================================================== */
:root{
  --c-bg:#ffffff; --c-surface:#f4f7fb; --c-surface-2:#e9eff7;
  --c-ink:#11203a; --c-ink-soft:#3f4f68; --c-muted:#5d6b82;
  --c-brand:#0a5ad6; --c-brand-d:#0846a8; --c-brand-l:#e7f0ff;
  --c-accent:#0a9e8e; --c-accent-d:#077f72;
  --c-line:#d4ddea; --c-warn:#b54708; --c-ok:#067647;
  --radius:12px; --radius-s:8px;
  --shadow:0 1px 2px rgba(17,32,58,.06),0 6px 20px rgba(17,32,58,.08);
  --shadow-s:0 1px 2px rgba(17,32,58,.08);
  --wrap:1180px; --gap:clamp(14px,2.4vw,26px);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --tap:44px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--c-ink);background:var(--c-bg);
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--c-brand);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.22;color:var(--c-ink);margin:0 0 .5em;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(1.6rem,4.4vw,2.4rem)}
h2{font-size:clamp(1.3rem,3vw,1.75rem);margin-top:1.6em}
h3{font-size:clamp(1.12rem,2.2vw,1.3rem);margin-top:1.2em}
p{margin:0 0 1em}
:focus-visible{outline:3px solid var(--c-brand);outline-offset:2px;border-radius:4px}
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(14px,4vw,28px)}
.skip{position:absolute;left:-9999px;top:0;background:var(--c-brand);color:#fff;padding:12px 18px;z-index:200;border-radius:0 0 8px 0}
.skip:focus{left:0}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--c-line)}
.hd{display:flex;align-items:center;gap:14px;min-height:64px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;color:var(--c-ink);
  letter-spacing:-.02em;font-size:1.16rem;flex:0 0 auto}
.brand:hover{text-decoration:none}
.brand .logo{width:38px;height:38px;flex:0 0 auto;color:var(--c-brand)}
.brand small{display:block;font-size:.62rem;font-weight:600;color:var(--c-muted);letter-spacing:.02em;line-height:1.1}
.nav-top{margin-left:auto;display:none;gap:4px;align-items:center}
.nav-top a{display:inline-flex;align-items:center;min-height:var(--tap);padding:0 13px;border-radius:var(--radius-s);
  color:var(--c-ink-soft);font-weight:600;font-size:.95rem}
.nav-top a:hover{background:var(--c-brand-l);color:var(--c-brand-d);text-decoration:none}
.burger{margin-left:auto;display:inline-flex;align-items:center;justify-content:center;
  width:var(--tap);height:var(--tap);border:1px solid var(--c-line);border-radius:var(--radius-s);
  background:#fff;color:var(--c-ink);cursor:pointer}
.burger svg{width:24px;height:24px}
.burger .ico-close{display:none}
.burger[aria-expanded="true"] .ico-open{display:none}
.burger[aria-expanded="true"] .ico-close{display:block}

/* ---------- mobile drawer ---------- */
.drawer{position:fixed;inset:0 0 0 auto;width:min(86vw,380px);background:#fff;z-index:120;
  transform:translateX(100%);transition:transform .26s ease;overflow-y:auto;
  box-shadow:-12px 0 36px rgba(17,32,58,.18);padding:18px 16px 40px;-webkit-overflow-scrolling:touch}
.drawer[data-open="true"]{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.scrim{position:fixed;inset:0;background:rgba(17,32,58,.5);z-index:110;opacity:0;visibility:hidden;transition:opacity .26s}
.scrim[data-open="true"]{opacity:1;visibility:visible}
.drawer nav a{display:block;min-height:var(--tap);padding:11px 12px;border-radius:var(--radius-s);
  color:var(--c-ink);font-weight:600}
.drawer nav a:hover{background:var(--c-surface);text-decoration:none}
.drawer .nav-sec{margin-top:14px;font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;
  color:var(--c-muted);font-weight:700;padding:0 12px}
.drawer details{border-top:1px solid var(--c-line)}
.drawer details>summary{list-style:none;display:flex;align-items:center;justify-content:space-between;
  min-height:var(--tap);padding:11px 12px;font-weight:700;cursor:pointer;color:var(--c-ink)}
.drawer details>summary::-webkit-details-marker{display:none}
.drawer details>summary::after{content:"";width:10px;height:10px;border-right:2px solid var(--c-muted);
  border-bottom:2px solid var(--c-muted);transform:rotate(45deg);transition:transform .2s}
.drawer details[open]>summary::after{transform:rotate(225deg)}
.drawer details .sub a{padding-left:24px;font-weight:500;font-size:.95rem;color:var(--c-ink-soft)}

/* ---------- hero ---------- */
.hero{background:linear-gradient(135deg,#0a5ad6 0%,#0a9e8e 100%);color:#fff;position:relative;overflow:hidden}
.hero .wrap{padding-block:clamp(34px,6vw,64px)}
.hero h1{color:#fff;max-width:18ch}
.hero p{color:#eaf2ff;font-size:clamp(1rem,2.2vw,1.18rem);max-width:60ch;margin-bottom:1.4em}
.hero.has-img{position:relative;overflow:hidden;isolation:isolate}
.hero-bg{position:absolute;inset:0;z-index:-1}
.hero-bg img{width:100%;height:100%;object-fit:cover}
.hero.has-img::after{content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(120deg,rgba(8,70,168,.92) 0%,rgba(8,70,168,.74) 42%,rgba(10,158,142,.66) 100%)}
.hero-inner{position:relative}
/* category hero band */
.cat-hero{position:relative;overflow:hidden;isolation:isolate;color:#fff;min-height:190px;display:flex;align-items:flex-end}
.cat-hero .hero-inner{padding-block:22px}
.cat-hero h1{color:#fff;margin:0;text-shadow:0 1px 12px rgba(8,30,60,.35)}
.cat-hero::after{content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(180deg,rgba(8,30,60,.25) 0%,rgba(8,46,108,.55) 55%,rgba(8,70,168,.82) 100%)}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;gap:8px;min-height:var(--tap);padding:0 20px;border-radius:var(--radius-s);
  font-weight:700;font-size:1rem;cursor:pointer;border:2px solid transparent;transition:transform .12s,background .15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:#fff;color:var(--c-brand-d)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.55)}
.btn-ghost:hover{background:rgba(255,255,255,.2)}
.btn-brand{background:var(--c-brand);color:#fff}
.btn-brand:hover{background:var(--c-brand-d)}

/* ---------- sections / cards ---------- */
section{scroll-margin-top:80px}
.block{padding-block:clamp(28px,5vw,52px)}
.block.alt{background:var(--c-surface)}
.sec-head{max-width:64ch;margin-bottom:1.4em}
.sec-head p{color:var(--c-muted);margin:0}
.grid{display:grid;gap:var(--gap)}
.grid.cards{grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr))}
.card{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:18px;
  display:flex;flex-direction:column;gap:8px;box-shadow:var(--shadow-s);transition:border-color .15s,box-shadow .15s,transform .12s}
.card:hover{border-color:var(--c-brand);box-shadow:var(--shadow);transform:translateY(-2px)}
.card .ico{width:46px;height:46px;color:var(--c-brand);background:var(--c-brand-l);border-radius:10px;padding:9px}
.card h3{margin:.2em 0 0;font-size:1.08rem}
.card p{margin:0;color:var(--c-muted);font-size:.92rem}
.card .meta{margin-top:auto;font-size:.82rem;color:var(--c-accent-d);font-weight:600}
.card-link{color:inherit}.card-link:hover{text-decoration:none}

/* ---------- widgets teaser grid ---------- */
.tools{display:grid;gap:var(--gap);grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))}
.tool{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--c-line);
  border-radius:var(--radius);padding:18px;box-shadow:var(--shadow-s)}
.tool:hover{border-color:var(--c-accent);text-decoration:none}
.tool .ico{width:44px;height:44px;flex:0 0 auto;color:var(--c-accent);background:#e4f7f4;border-radius:10px;padding:9px}
.tool b{display:block;color:var(--c-ink);font-size:1.04rem}
.tool span{color:var(--c-muted);font-size:.9rem}

/* ---------- footer ---------- */
.site-footer{background:#0e1c33;color:#c4d0e4;margin-top:48px;padding-block:34px 26px}
.site-footer a{color:#dce6f7}
.foot-cols{display:grid;gap:26px;grid-template-columns:1fr}
.site-footer h4{color:#fff;font-size:.96rem;margin-bottom:.7em}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:7px}
.site-footer .muted{color:#8595b0;font-size:.85rem}
.foot-bottom{border-top:1px solid #25344f;margin-top:26px;padding-top:18px;font-size:.85rem;color:#8595b0}
.lm-box{margin-top:18px;font-size:.82rem;line-height:1.5}
.lm-box a{color:#9fb3d6}

/* ---------- breadcrumbs ---------- */
.crumbs{font-size:.85rem;color:var(--c-muted);padding-block:14px 2px}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumbs li::after{content:"/";margin-left:6px;color:var(--c-line)}
.crumbs li:last-child::after{content:""}

/* ---------- prose ---------- */
.prose{max-width:72ch}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1em}
.prose li{margin-bottom:.4em}
.spec-table{width:100%;border-collapse:collapse;margin:1em 0;table-layout:fixed;font-size:.95rem}
.spec-table th,.spec-table td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--c-line);vertical-align:top}
.spec-table th{width:42%;color:var(--c-ink-soft);font-weight:600;background:var(--c-surface)}
.callout{background:var(--c-brand-l);border-left:4px solid var(--c-brand);border-radius:8px;padding:14px 16px;margin:1.2em 0}
.callout.norm{background:#fff7ed;border-color:var(--c-warn)}

/* ---------- product/category layout ---------- */
.with-aside{display:grid;gap:var(--gap);grid-template-columns:1fr}
@media(min-width:980px){.with-aside{grid-template-columns:minmax(0,1fr) 300px}}
.aside-cat{position:sticky;top:80px;align-self:start}
.cat-nav{border:1px solid var(--c-line);border-radius:var(--radius);overflow:hidden;background:#fff}
.cat-nav>strong{display:block;padding:12px 14px;background:var(--c-surface);font-size:.95rem}
.cat-nav a{display:block;padding:9px 14px;border-top:1px solid var(--c-line);color:var(--c-ink-soft);font-size:.92rem}
.cat-nav a:hover{background:var(--c-brand-l);text-decoration:none}
.tag{display:inline-block;background:var(--c-surface-2);color:var(--c-ink-soft);border-radius:6px;
  padding:3px 9px;font-size:.8rem;font-weight:600}

/* ---------- responsive switches ---------- */
@media(min-width:880px){
  .nav-top{display:flex}
  .burger{display:none}
  .foot-cols{grid-template-columns:1.4fr 1fr 1fr 1fr}
}
/* ---------- widgets: конструктор ---------- */
.obj-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:1.4em 0 1.6em}
.obj-tab{display:inline-flex;align-items:center;gap:8px;min-height:var(--tap);padding:0 14px;
  border:1px solid var(--c-line);border-radius:999px;background:#fff;color:var(--c-ink-soft);
  font-weight:600;font-size:.94rem;cursor:pointer}
.obj-tab:hover{border-color:var(--c-brand);color:var(--c-brand-d);text-decoration:none}
.obj-tab.is-active{background:var(--c-brand);border-color:var(--c-brand);color:#fff}
.obj-tab .ico{width:22px;height:22px;flex:0 0 auto}
.req-groups{display:grid;gap:var(--gap);grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr))}
.req-group{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow-s)}
.req-head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:.4em}
.req-head h3{margin:0;font-size:1.06rem}
.req-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.req-list li{padding-left:24px;position:relative}
.req-list li::before{content:"";position:absolute;left:2px;top:.5em;width:10px;height:10px;border-radius:3px;
  background:var(--c-brand-l);border:2px solid var(--c-brand)}
.req-list a{color:var(--c-ink);font-weight:500}
.req-list a:hover{color:var(--c-brand-d)}

/* ---------- widgets: чек-лист ---------- */
.checklist{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr));align-items:start}
.chk-group{border:1px solid var(--c-line);border-radius:var(--radius);padding:14px 16px;margin:0;background:#fff}
.chk-group legend{font-weight:700;padding:0 6px;color:var(--c-ink)}
.chk{display:flex;gap:10px;align-items:flex-start;min-height:var(--tap);padding:6px 0;cursor:pointer;line-height:1.45}
.chk input{width:22px;height:22px;flex:0 0 auto;margin-top:1px;accent-color:var(--c-brand);cursor:pointer}
.chk-bar{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;
  background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:14px 18px}
.chk-progress{flex:1;min-width:200px;height:12px;background:var(--c-surface-2);border-radius:999px;overflow:hidden}
.chk-progress span{display:block;height:100%;background:linear-gradient(90deg,var(--c-brand),var(--c-accent));transition:width .25s}
.chk-meta{display:flex;align-items:center;gap:12px;font-size:.95rem;color:var(--c-muted)}
.chk-meta b{color:var(--c-ink)}

/* ---------- widgets: нормативы ---------- */
.norm-search{width:100%;max-width:520px;min-height:var(--tap);padding:0 16px;margin-bottom:1em;
  border:1px solid var(--c-line);border-radius:var(--radius-s);font-size:1rem;font-family:inherit}
.norm-search:focus{outline:none;border-color:var(--c-brand);box-shadow:0 0 0 3px var(--c-brand-l)}
.norm-table-wrap{overflow-x:auto}
.norm-table th{background:var(--c-surface)}

@media print{
  .site-header,.drawer,.scrim,.site-footer,.obj-tabs,.norm-search,.chk-print,.hero-cta,.crumbs,#normy{display:none!important}
  .chk-bar button{display:none}
  body{font-size:12pt}
  .chk-group{break-inside:avoid;border-color:#999}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto}}