/* ============================================================================
   ОСАГО·Тариф — общий стиль сайта
   Подключается на всех страницах: index.html -> "style.css",
   страницы в /articles/ -> "../style.css".
   Шрифты (Unbounded + Manrope) подключаются <link>-ом в <head> каждой страницы.
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root{
  --navy:#0A2E52;
  --blue:#0E6BA8;
  --blue-bright:#2A8BD5;
  --green:#0E9E6E;
  --green-deep:#0B7C57;
  --amber:#F5A623;
  --amber-deep:#E07C0B;
  --ink:#0F2436;
  --muted:#5B7488;
  --line:#E2ECF3;
  --bg:#F4F8FB;
  --surface:#FFFFFF;
  --surface-tint:#EEF5FA;
  --shadow:0 18px 44px -22px rgba(10,46,82,.34);
  --shadow-sm:0 8px 22px -14px rgba(10,46,82,.30);
  --r:18px;
  --accent:#0E6BA8;      /* акцент по умолчанию; страница может переопределить */
  --accent-soft:#E7F0F8;
}

/* ---------- Base ---------- */
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Manrope",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  line-height:1.6;-webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.disp{font-family:"Unbounded","Manrope",sans-serif;letter-spacing:-.01em}
a{color:inherit}
img,svg{max-width:100%}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px}
.eyebrow{
  font-family:"Manrope";font-weight:700;font-size:.74rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--accent);display:inline-flex;align-items:center;gap:9px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--amber);border-radius:2px}

/* ---------- Header ---------- */
header.site{
  position:sticky;top:0;z-index:50;background:rgba(244,248,251,.84);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:26px;height:66px}
.brand{display:flex;align-items:center;gap:11px;font-family:"Unbounded";font-weight:800;font-size:1.02rem;text-decoration:none;color:var(--ink)}
.mark{
  width:34px;height:34px;border-radius:10px;flex:none;position:relative;
  background:linear-gradient(135deg,var(--blue),var(--navy));
  box-shadow:inset 0 0 0 2px rgba(255,255,255,.12);
}
.mark::before{content:"";position:absolute;inset:8px 8px auto 8px;height:5px;border-radius:4px;background:var(--amber)}
.mark::after{content:"";position:absolute;left:8px;right:8px;bottom:8px;height:5px;border-radius:4px;background:var(--green)}
.brand small{display:block;font-family:"Manrope";font-weight:600;font-size:.66rem;letter-spacing:.04em;color:var(--muted)}
.nav-links{display:flex;gap:22px;margin-left:auto;font-weight:600;font-size:.92rem}
.nav-links a{text-decoration:none;color:var(--muted);transition:color .18s}
.nav-links a:hover{color:var(--navy)}
.nav-cta{
  text-decoration:none;font-weight:700;font-size:.9rem;padding:10px 18px;border-radius:999px;
  background:var(--navy);color:#fff;transition:transform .18s,box-shadow .18s;
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:var(--shadow-sm)}

/* ---------- Landing hero ---------- */
.hero{padding:64px 0 40px;position:relative;overflow:hidden}
.hero::after{
  content:"";position:absolute;top:-120px;right:-140px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle at 30% 30%,rgba(245,166,35,.22),transparent 62%),
             radial-gradient(circle at 70% 70%,rgba(14,158,110,.20),transparent 60%);
  filter:blur(4px);z-index:0;pointer-events:none;
}
.hero .wrap{position:relative;z-index:1}
.hero h1{font-size:clamp(2.05rem,5.4vw,3.5rem);font-weight:800;line-height:1.04;margin:16px 0 0;max-width:15ch}
.hero h1 .hl{color:var(--blue)}
.hero p.lead{font-size:1.08rem;color:var(--muted);max-width:52ch;margin:18px 0 0;font-weight:500}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}
.btn{
  display:inline-flex;align-items:center;gap:9px;text-decoration:none;font-weight:700;
  padding:14px 24px;border-radius:999px;font-size:.98rem;cursor:pointer;border:none;
  transition:transform .18s,box-shadow .18s,background .18s;
}
.btn-primary{background:linear-gradient(135deg,var(--green),var(--green-deep));color:#fff;box-shadow:var(--shadow-sm)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-ghost{background:var(--surface);color:var(--navy);box-shadow:inset 0 0 0 1.5px var(--line)}
.btn-ghost:hover{transform:translateY(-2px);box-shadow:inset 0 0 0 1.5px var(--blue)}

/* ---------- Formula signature ---------- */
.formula-card{
  margin-top:40px;background:var(--surface);border-radius:var(--r);padding:26px 26px 22px;
  box-shadow:var(--shadow);border:1px solid var(--line);
}
.formula-card .cap{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.formula-card .cap b{font-family:"Unbounded";font-weight:600;font-size:1.02rem}
.formula-card .cap span{color:var(--muted);font-size:.86rem;font-weight:500}
.formula{display:flex;flex-wrap:wrap;align-items:stretch;gap:9px}
.op{display:flex;align-items:center;justify-content:center;color:var(--muted);font-weight:800;font-size:1.15rem;padding:0 2px}
.chip{
  --c:var(--blue);
  flex:1 1 92px;min-width:88px;background:color-mix(in srgb,var(--c) 9%,#fff);
  border:1px solid color-mix(in srgb,var(--c) 26%,#fff);border-radius:13px;
  padding:11px 12px;text-align:center;position:relative;
}
.chip .k{font-family:"Unbounded";font-weight:600;font-size:1.02rem;color:var(--c)}
.chip .lbl{display:block;font-size:.68rem;color:var(--muted);font-weight:600;margin-top:3px;line-height:1.25}
.chip.blue{--c:var(--blue)} .chip.navy{--c:var(--navy)} .chip.green{--c:var(--green-deep)}
.chip.amber{--c:var(--amber-deep)}

/* ---------- Section shell ---------- */
section{padding:56px 0}
.sec-head{max-width:60ch}
.sec-head h2{font-size:clamp(1.6rem,3.4vw,2.3rem);font-weight:800;margin:12px 0 0;line-height:1.1}
.sec-head p{color:var(--muted);font-size:1.02rem;margin:14px 0 0;font-weight:500}

/* ---------- Coefficient explainer grid ---------- */
.coef-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;margin-top:32px}
.coef{
  background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:18px 18px 16px;
  transition:transform .2s,box-shadow .2s;border-top:3px solid var(--tc,var(--blue));
}
.coef:hover{transform:translateY(-4px);box-shadow:var(--shadow-sm)}
.coef .abbr{font-family:"Unbounded";font-weight:700;color:var(--tc,var(--blue));font-size:1.1rem}
.coef h4{margin:6px 0 6px;font-size:.98rem;font-weight:800}
.coef p{margin:0;color:var(--muted);font-size:.86rem;font-weight:500}

/* ---------- Tabs (reference tables) ---------- */
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px}
.tab{
  border:none;cursor:pointer;font-family:inherit;font-weight:700;font-size:.9rem;
  padding:10px 17px;border-radius:999px;background:var(--surface);color:var(--muted);
  box-shadow:inset 0 0 0 1.5px var(--line);transition:.18s;
}
.tab:hover{color:var(--navy)}
.tab[aria-selected="true"]{background:var(--navy);color:#fff;box-shadow:none}
.panel{display:none;margin-top:22px}
.panel.active{display:block;animation:fade .35s ease}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.panel-note{color:var(--muted);font-size:.9rem;font-weight:500;margin:0 0 16px}

/* ---------- Tables (shared: landing + articles) ---------- */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:14px;border:1px solid var(--line);box-shadow:var(--shadow-sm);margin:22px 0}
table{border-collapse:collapse;width:100%;background:var(--surface);font-size:.9rem;min-width:560px}
caption{text-align:left;padding:14px 16px;font-weight:700;background:var(--surface-tint);border-bottom:1px solid var(--line);font-size:.92rem;color:var(--navy)}
th,td{padding:10px 13px;text-align:left;border-bottom:1px solid var(--line)}
thead th{background:var(--navy);color:#fff;font-weight:700;font-size:.8rem;line-height:1.25;position:sticky;top:0}
thead th small{display:block;font-weight:500;color:#B7CEE0;font-size:.9em}
tbody tr:nth-child(even){background:var(--surface-tint)}
tbody tr:hover{background:#E4F1EA}
/* landing table helpers */
td.val,th.val{font-family:"Unbounded";font-weight:600;text-align:center}
.kvs-corner{background:var(--surface-tint)!important;color:var(--muted);font-weight:700}
.kvs th[scope="col"]{text-align:center}
.kvs td:first-child{font-weight:700;background:var(--surface-tint)}
.kvs td.hi{background:var(--amber)!important;color:#3a2500;font-weight:800;border-radius:4px}
.badge-min{color:var(--green-deep);font-weight:800}
.badge-max{color:var(--amber-deep);font-weight:800}
/* article table helpers */
td.n,th.n{text-align:center;font-variant-numeric:tabular-nums;white-space:nowrap}
td.model{font-weight:700;color:var(--navy)}
td.km{font-family:"Unbounded";font-weight:600;text-align:center}
.pmin{color:var(--green-deep);font-weight:800}
.pmax{color:var(--amber-deep);font-weight:800}

/* ---------- Calculator ---------- */
.calc-section{background:linear-gradient(180deg,#0A2E52,#0C3A66);color:#fff;border-radius:0;padding:60px 0}
.calc-section .sec-head h2{color:#fff}
.calc-section .sec-head p{color:#B7CEE0}
.calc-section .eyebrow{color:#8FD0FF}
.calc-shell{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;margin-top:34px;align-items:start}
.calc-form{background:#fff;color:var(--ink);border-radius:20px;padding:26px;box-shadow:var(--shadow)}
.fgroup-title{font-family:"Unbounded";font-weight:600;font-size:.78rem;letter-spacing:.02em;color:var(--blue);text-transform:uppercase;margin:22px 0 12px;display:flex;align-items:center;gap:8px}
.fgroup-title:first-child{margin-top:0}
.fgroup-title .num{width:22px;height:22px;flex:none;border-radius:7px;background:var(--surface-tint);color:var(--blue);display:grid;place-items:center;font-family:"Manrope";font-weight:800;font-size:.78rem}
.fields{display:grid;grid-template-columns:1fr 1fr;gap:13px}
.field{display:flex;flex-direction:column;gap:6px}
.field.wide{grid-column:1 / -1}
.field label{font-size:.82rem;font-weight:700;color:var(--navy)}
.field label .req{color:var(--amber-deep)}
.field input,.field select{
  font-family:inherit;font-size:.95rem;padding:11px 13px;border-radius:11px;
  border:1.5px solid var(--line);background:#fff;color:var(--ink);transition:border .16s,box-shadow .16s;width:100%;
}
.field input:focus,.field select:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(14,107,168,.14)}
.field .hint{font-size:.72rem;color:var(--muted);font-weight:500}
.field.err input,.field.err select{border-color:#D64545;box-shadow:0 0 0 3px rgba(214,69,69,.12)}
.field .msg{font-size:.72rem;color:#D64545;font-weight:600;display:none}
.field.err .msg{display:block}
.submit-row{margin-top:24px;display:flex;flex-direction:column;gap:10px}
.btn-calc{width:100%;justify-content:center;background:linear-gradient(135deg,var(--amber),var(--amber-deep));color:#3a2500;font-size:1.02rem;padding:15px}
.btn-calc:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.consent{font-size:.72rem;color:var(--muted);text-align:center;font-weight:500}
.consent a{color:var(--blue)}
.calc-side{position:sticky;top:82px}
.result{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:20px;padding:24px;backdrop-filter:blur(4px)}
.result h3{margin:0;font-size:1.05rem;font-weight:700;color:#fff}
.result .sub{color:#AFCBE2;font-size:.84rem;font-weight:500;margin:4px 0 18px}
.price{display:flex;align-items:flex-end;gap:8px;flex-wrap:wrap}
.price .from{font-size:.8rem;color:#AFCBE2;font-weight:600;align-self:center}
.price .num{font-family:"Unbounded";font-weight:800;font-size:2.1rem;line-height:1;color:#fff}
.price .dash{color:#8FD0FF;font-weight:800;align-self:center}
.price .cur{font-weight:700;align-self:center;color:#DCE9F3}
.price-note{font-size:.76rem;color:#9FBBD4;margin:12px 0 20px;font-weight:500}
.breakdown{display:flex;flex-direction:column;gap:8px}
.brow{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:.86rem;padding:9px 12px;background:rgba(255,255,255,.06);border-radius:10px}
.brow .bk{display:flex;align-items:center;gap:9px;color:#DCE9F3;font-weight:600}
.dot{width:9px;height:9px;border-radius:50%;flex:none}
.brow .bv{font-family:"Unbounded";font-weight:600;color:#fff}
.result-empty{color:#AFCBE2;font-size:.9rem;font-weight:500;line-height:1.5}
.sent{display:none;background:rgba(14,158,110,.16);border:1px solid rgba(14,158,110,.5);border-radius:12px;padding:14px 15px;margin-top:16px;font-size:.86rem;font-weight:600;color:#CFF3E4}
.sent.show{display:block;animation:fade .3s ease}
.sent b{color:#fff}

/* ---------- Articles index cards (on landing) ---------- */
#articles .art-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:8px}
#articles .art-card{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);
  background:var(--surface);border:1px solid var(--line);border-radius:20px;overflow:hidden;
  box-shadow:0 10px 26px -18px rgba(10,46,82,.32);transition:transform .2s,box-shadow .2s}
#articles .art-card:hover{transform:translateY(-5px);box-shadow:0 22px 50px -24px rgba(10,46,82,.4)}
#articles .art-thumb{height:132px;position:relative;display:block}
#articles .art-thumb svg{width:100%;height:100%;display:block}
#articles .art-body{padding:18px 20px 22px;display:flex;flex-direction:column;flex:1}
#articles .art-brand{font-family:"Unbounded",sans-serif;font-weight:600;font-size:.72rem;
  letter-spacing:.12em;text-transform:uppercase}
#articles h3.art-title{font-family:"Unbounded",sans-serif;font-weight:700;font-size:1.16rem;
  margin:8px 0 6px;line-height:1.2;color:var(--navy)}
#articles .art-desc{font-size:.92rem;color:var(--muted);margin:0 0 14px;flex:1}
#articles .art-from{font-size:.82rem;color:var(--ink);font-weight:600;margin-bottom:12px}
#articles .art-from b{font-family:"Unbounded",sans-serif}
#articles .art-more{font-weight:700;font-size:.9rem;display:inline-flex;align-items:center;gap:6px}

/* ---------- Article page: breadcrumbs & hero ---------- */
.crumbs{padding:20px 0 0;font-size:.82rem;color:var(--muted);font-weight:600}
.crumbs a{text-decoration:none;color:var(--muted)}
.crumbs a:hover{color:var(--accent)}
.a-hero{padding:22px 0 20px}
.a-hero h1{font-size:clamp(1.9rem,4.6vw,3rem);font-weight:800;line-height:1.08;margin:14px 0 0;max-width:20ch}
.a-hero .sub{font-size:1.08rem;color:var(--muted);font-weight:500;max-width:60ch;margin:16px 0 0}
.a-hero .meta{display:flex;flex-wrap:wrap;gap:16px;margin-top:18px;font-size:.82rem;color:var(--muted);font-weight:600}
.a-hero .meta span{display:inline-flex;align-items:center;gap:7px}
.hero-fig{margin:26px 0 0;border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);background:var(--surface)}
.hero-fig svg{display:block;width:100%;height:auto}

/* ---------- Article page: layout + TOC ---------- */
.a-body{display:grid;grid-template-columns:1fr 260px;gap:44px;padding:44px 0 20px;align-items:start}
.prose{min-width:0;max-width:760px;line-height:1.68}
.prose a{color:var(--blue)}
.toc{position:sticky;top:84px;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px 18px;box-shadow:var(--shadow-sm)}
.toc b{font-family:"Unbounded";font-weight:600;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:12px}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:t}
.toc li{counter-increment:t;margin:0 0 3px}
.toc a{display:flex;gap:9px;text-decoration:none;color:var(--muted);font-size:.86rem;font-weight:600;padding:6px 8px;border-radius:8px;transition:.16s;line-height:1.3}
.toc a::before{content:counter(t,decimal-leading-zero);color:var(--accent);font-family:"Unbounded";font-weight:600;font-size:.72rem}
.toc a:hover{background:var(--accent-soft);color:var(--navy)}

/* ---------- Article prose typography ---------- */
.prose h2{font-size:clamp(1.4rem,3vw,1.85rem);font-weight:800;margin:46px 0 4px;line-height:1.15;scroll-margin-top:82px}
.prose h2 .lead-num{color:var(--accent);font-size:.8em;margin-right:.4em}
.prose h3{font-size:1.16rem;font-weight:800;margin:30px 0 2px;color:var(--navy)}
.prose p{margin:14px 0;font-size:1.02rem;color:#243b4d}
.prose ul,.prose ol{margin:14px 0;padding-left:22px}
.prose li{margin:7px 0;font-size:1.02rem;color:#243b4d}
.prose strong{color:var(--navy)}
.lead-p{font-size:1.14rem!important;color:var(--ink)!important;font-weight:500}

/* ---------- Article figures & callouts ---------- */
figure.ill{margin:30px 0;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-sm)}
figure.ill svg{display:block;width:100%;height:auto}
figure.ill figcaption{padding:11px 16px;font-size:.8rem;color:var(--muted);font-weight:600;background:var(--surface-tint);border-top:1px solid var(--line)}
.callout{margin:24px 0;padding:18px 20px;border-radius:14px;border-left:4px solid var(--accent);background:var(--accent-soft)}
.callout.green{border-color:var(--green);background:#E6F6EF}
.callout.amber{border-color:var(--amber);background:#FEF3DE}
.callout b{font-family:"Unbounded";font-weight:600;font-size:.95rem;display:block;margin-bottom:5px;color:var(--navy)}
.callout p{margin:0;font-size:.95rem;color:#33475a}

/* ---------- Article CTA band & related ---------- */
.cta-band{margin:40px 0 6px;background:linear-gradient(135deg,var(--navy),#0C3A66);color:#fff;border-radius:var(--r);padding:30px 28px;display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
.cta-band h3{margin:0;color:#fff;font-size:1.25rem;font-weight:800}
.cta-band p{margin:6px 0 0;color:#B7CEE0;font-size:.94rem;font-weight:500;max-width:52ch}
.cta-band a{flex:none;text-decoration:none;font-weight:700;padding:14px 26px;border-radius:999px;background:linear-gradient(135deg,var(--amber),var(--amber-deep));color:#3a2500;transition:transform .18s,box-shadow .18s}
.cta-band a:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.related{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0 0}
.related a{text-decoration:none;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 18px;box-shadow:var(--shadow-sm);transition:transform .18s,box-shadow .18s;color:var(--ink)}
.related a:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.related .tag{font-size:.72rem;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:.06em}
.related b{display:block;font-family:"Unbounded";font-weight:600;font-size:1rem;margin-top:6px}

/* ---------- FAQ (shared) ---------- */
.faq{display:grid;gap:12px;margin-top:30px}
details{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:2px 20px;box-shadow:var(--shadow-sm)}
details[open]{border-color:var(--accent)}
summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:700;display:flex;justify-content:space-between;align-items:center;gap:14px;color:var(--navy)}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-family:"Unbounded";color:var(--accent);font-size:1.3rem;transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{margin:0 0 16px;color:#33475a;font-weight:500;font-size:.95rem}

/* ---------- Footer ---------- */
footer.site{background:var(--navy);color:#B7CEE0;padding:40px 0 30px;font-size:.86rem;margin-top:40px}
footer .top{display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;align-items:center;padding-bottom:22px;border-bottom:1px solid rgba(255,255,255,.12)}
footer .brand{color:#fff}
footer .brand small{color:#8FB2CE}
footer p{margin:18px 0 0;max-width:80ch;font-weight:500;line-height:1.6}
footer .disc{color:#7FA0BC;font-size:.78rem}

/* ---------- Mobile menu control (CSS-only burger) ---------- */
.nav-burger{display:none;margin-left:auto;width:44px;height:44px;flex:none;cursor:pointer;
  border-radius:11px;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  background:var(--surface);box-shadow:inset 0 0 0 1.5px var(--line)}
.nav-burger span{display:block;width:20px;height:2px;border-radius:2px;background:var(--navy);
  transition:transform .22s ease,opacity .2s ease}
.nav-cta--mobile{display:none}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .a-body{grid-template-columns:1fr}
  .toc{position:static;order:-1}
  .related{grid-template-columns:1fr}
}
@media(max-width:860px){
  /* header → burger menu */
  .nav{gap:14px}
  .nav-burger{display:flex}
  .nav-cta--desktop{display:none}
  .nav-links{
    position:absolute;left:0;right:0;top:100%;margin-left:0;
    flex-direction:column;gap:2px;padding:12px 22px 18px;
    background:var(--surface);border-bottom:1px solid var(--line);box-shadow:var(--shadow);
    display:none;
  }
  .nav-toggle:checked ~ .nav-links{display:flex}
  .nav-links a{padding:12px 6px;font-size:1rem;border-bottom:1px solid var(--line)}
  .nav-links a:last-of-type{border-bottom:none}
  .nav-cta--mobile{display:inline-flex;justify-content:center;margin-top:12px;border-bottom:none}
  /* burger → X when open */
  .nav-toggle:checked ~ .nav-burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle:checked ~ .nav-burger span:nth-child(2){opacity:0}
  .nav-toggle:checked ~ .nav-burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  /* calculator stacks */
  .calc-shell{grid-template-columns:1fr}
  .calc-side{position:static}
  .fields{grid-template-columns:1fr}
}
@media(max-width:820px){#articles .art-grid{grid-template-columns:1fr}}
@media(max-width:640px){
  section{padding:42px 0}
  .calc-section{padding:44px 0}
  .hero{padding:40px 0 30px}
  .formula-card{margin-top:28px;padding:18px 16px 16px}
  .calc-form{padding:20px 18px}
  .result{padding:20px 18px}
  .cta-band{padding:24px 20px}
  .cta-band a{width:100%;text-align:center;justify-content:center}
  .hero-actions{gap:10px}
  .hero-actions .btn{flex:1 1 100%;justify-content:center}
}
@media(max-width:420px){
  .wrap{padding:0 16px}
  .brand{font-size:.94rem}
  .price .num{font-size:1.7rem}
  .tab{font-size:.84rem;padding:9px 13px}
  .btn{padding:13px 20px}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto}}

/* ---------- Blog / Статьи (главная) ---------- */
#articles{background:var(--surface-tint)}
.blog-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;max-width:none}
.blog-head .sec-sub{color:var(--muted);font-size:1.02rem;margin:14px 0 0;font-weight:500;max-width:60ch}
.blog-all{flex:none;font-weight:800;font-size:.9rem;color:var(--blue);text-decoration:none;
  display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border-radius:999px;
  background:var(--surface);box-shadow:var(--shadow-sm);transition:transform .18s,box-shadow .18s}
.blog-all:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.blog-card{--tc:var(--blue);display:flex;flex-direction:column;gap:9px;padding:22px 22px 20px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
  text-decoration:none;color:var(--ink);box-shadow:var(--shadow-sm);
  transition:transform .2s,box-shadow .2s,border-color .2s}
.blog-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--tc)}
.blog-tag{align-self:flex-start;font-family:"Manrope",sans-serif;font-weight:800;font-size:.68rem;
  letter-spacing:.08em;text-transform:uppercase;color:var(--tc);
  background:var(--accent-soft);background:color-mix(in srgb,var(--tc) 13%,#fff);
  padding:5px 11px;border-radius:999px}
.blog-title{font-family:"Unbounded",sans-serif;font-weight:700;font-size:1.04rem;line-height:1.25;
  margin:3px 0 0;color:var(--navy)}
.blog-excerpt{font-size:.9rem;color:var(--muted);line-height:1.5;margin:0;flex:1}
.blog-more{margin-top:6px;font-weight:800;font-size:.85rem;color:var(--tc);
  display:inline-flex;align-items:center;gap:6px}
@media(max-width:980px){.blog-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.blog-grid{grid-template-columns:1fr}}
.blog-empty{margin-top:24px;padding:40px 28px;text-align:center;background:var(--surface);
  border:1.5px dashed var(--line);border-radius:var(--r)}
.blog-empty p{margin:0;color:var(--muted);font-weight:600;font-size:1rem}
