/* Corrosion protection: hub (/anticorrosion/) and reference topics, plus the band on the paints
   and primers pages. Built on styles.css and guides.css (cat-hero, sys-stats, finder, chips,
   guide cards, FAQ); loaded after them on the section's own pages. */
/* Hero: photo (photos.hero) over the first-year steel loss per category, a log scale so C1 still shows.
   The heading shrinks with the screen so «Антикоррозионная» never breaks mid-word on a phone. */
.ac-hero h1{font-size:min(clamp(2.7rem,5.2vw,5.6rem),calc((100vw - 2 * var(--pad)) / 8.7))}
.ac-hero-grid{align-items:stretch}
.ac-hero-side{display:flex;flex-direction:column;justify-content:flex-end;gap:30px;min-width:0}
.ac-hero-media{min-height:0;height:auto;aspect-ratio:16/9;flex:0 0 auto}
.ac-hero-media img{object-position:30% center}
.ac-scale{margin:0;border-top:1px solid var(--grey-3a);padding-top:18px}
.ac-scale figcaption{font-size:.72rem;letter-spacing:.09em;text-transform:uppercase;color:var(--grey-9a);margin-bottom:14px}
.ac-scale ol{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.ac-scale li{display:grid;grid-template-columns:38px minmax(0,1fr) 112px;gap:14px;align-items:center}
.ac-scale-cat{font-weight:500;font-size:.95rem;color:white;font-variant-numeric:tabular-nums}
.ac-scale-bar{display:block;height:10px;background:var(--grey-2a);border-radius:6px;overflow:hidden}
.ac-scale-fill{display:block;height:100%;border-radius:6px;background:linear-gradient(90deg,var(--grey-6b),var(--red));transform-origin:left;transition:transform 1.2s var(--ease,ease)}
.ac-scale-fill--c1{width:13%}
.ac-scale-fill--c2{width:50%}
.ac-scale-fill--c3{width:60%}
.ac-scale-fill--c4{width:67%}
.ac-scale-fill--c5{width:81%}
.ac-scale-fill--cx{width:100%}
.ac-scale-value{font-size:.8rem;color:var(--grey-bd);text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
/* Four steps */
.ac-step-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.ac-step-list li{border-top:2px solid var(--ink);padding-top:18px;flex-direction:column;display:grid;grid-row:span 3;grid-template-rows:subgrid;gap:12px}
.ac-step-list h3{font-size:1.2rem;line-height:1.3;letter-spacing:-.03em}
.ac-step-list p{font-size:.92rem;line-height:1.6;color:var(--muted)}
/* Selector: matrix next to the system cards */
.ac-selector{background:var(--grey-e8e8e6)}
.ac-finder{margin-bottom:22px}
.ac-finder .finder-row{grid-template-columns:120px minmax(0,1fr)}
.ac-finder .chips{display:flex;flex-wrap:wrap;gap:8px}
.ac-selector-grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:24px;align-items:start}
.ac-matrix-col{position:sticky;top:110px}
.ac-matrix-wrap{overflow-x:auto;background:white;border:1px solid var(--grey-dd)}
.ac-matrix{width:100%;border-collapse:collapse;font-size:.84rem}
.ac-matrix caption{text-align:left;padding:16px 16px 6px;font-size:.72rem;letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}
.ac-matrix th,.ac-matrix td{padding:6px;border-top:1px solid var(--grey-ec);text-align:center;vertical-align:middle}
.ac-matrix thead th{font-weight:500;border-top:0}
.ac-matrix th[scope=row]{text-align:left;padding-left:16px;white-space:nowrap}
.ac-matrix-level{display:block;font-size:.95rem}
.ac-matrix-years{display:block;font-size:.68rem;color:var(--muted);font-weight:400;white-space:nowrap}
.ac-matrix-cat{display:block;font-weight:600;font-size:.95rem;font-variant-numeric:tabular-nums}
.ac-matrix-name{display:block;font-size:.7rem;color:var(--muted);font-weight:400}
.ac-cell{display:flex;align-items:center;justify-content:center;min-height:44px;padding:4px 6px;border-radius:6px;font-size:.74rem;line-height:1.2;color:var(--grey-8a);background:var(--grey-f4f4f3);transition:background .2s,color .2s}
.ac-cell--on{background:var(--red-tint);color:var(--ink);font-weight:500}
.ac-cell:hover{background:var(--grey-ececea)}
.ac-cell--on:hover{background:var(--red-tint-strong)}
.ac-cell[aria-current="true"]{background:var(--action);color:white}
.ac-matrix-col .source-note{margin-top:10px;font-size:.78rem}
.ac-system-grid{display:grid;gap:16px}
.ac-system{background:white;border:1px solid var(--grey-d9);padding:24px;display:flex;flex-direction:column;gap:14px;scroll-margin-top:120px}
.ac-system[hidden]{display:none}
.ac-system-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}
.ac-system-kind{font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.ac-ratings{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.ac-rating{display:inline-flex;align-items:baseline;gap:6px;padding:6px 10px;border:1px solid var(--grey-d6);border-radius:100px;font-size:.78rem;line-height:1.2}
.ac-rating-cat{font-weight:600}
.ac-rating-level{color:var(--action);font-weight:600}
.ac-rating-years{color:var(--muted)}
.ac-total{display:grid;grid-template-columns:auto auto;align-items:baseline;gap:0 6px;text-align:right;flex-shrink:0;margin:0}
.ac-total-value{font-size:2.4rem;letter-spacing:-.05em;font-weight:500;line-height:1}
.ac-total-unit{font-size:.9rem;color:var(--muted)}
.ac-total-label{grid-column:1/-1;font-size:.7rem;color:var(--muted);max-width:120px;line-height:1.35;margin-top:4px}
.ac-system h3{font-size:1.4rem;line-height:1.25;letter-spacing:-.035em}
.ac-system-text{font-size:.92rem;line-height:1.55;color:var(--muted)}
.ac-layers{list-style:none;margin:0;padding:0;border-top:1px solid var(--grey-e6)}
.ac-layer{display:grid;grid-template-columns:34px minmax(0,150px) minmax(0,1fr) auto;gap:12px;align-items:baseline;padding:12px 0 12px 12px;border-bottom:1px solid var(--grey-e6);border-left:4px solid var(--tone-9aa1a8)}
.ac-layer--primer{border-left-color:var(--ac-primer)}
.ac-layer--intermediate{border-left-color:var(--ac-intermediate)}
.ac-layer--finish{border-left-color:var(--red)}
.ac-layer-num{font-size:.72rem;color:var(--muted);font-variant-numeric:tabular-nums}
.ac-layer-role{font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.ac-layer-name{font-weight:500;text-decoration:underline;text-decoration-color:var(--grey-c4);text-underline-offset:4px}
.ac-layer-name:hover{text-decoration-color:var(--ink)}
.ac-layer-dft{font-size:.82rem;color:var(--muted);text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.ac-spec{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 14px;align-items:center;background:var(--grey-f6f6f5);padding:12px 14px;border-radius:6px}
.ac-spec-label{grid-column:1/-1;font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.ac-spec-line{font-size:.85rem;line-height:1.5;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow-wrap:anywhere}
.ac-copy{display:inline-flex;align-items:center;gap:6px;min-height:38px;padding:0 12px;border:1px solid var(--grey-c9);border-radius:100px;background:white;font-size:.78rem;white-space:nowrap}
.ac-copy:hover{border-color:var(--ink)}
.ac-copy.is-done{border-color:var(--action);color:var(--action)}
.ac-system-foot{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;border-top:1px solid var(--grey-ee);padding-top:14px}
.ac-source{font-size:.76rem;line-height:1.45;color:var(--muted);max-width:44ch}
.ac-source a{text-decoration:underline;text-decoration-color:var(--grey-bb);text-underline-offset:3px}
.ac-empty{background:white;border:1px dashed var(--grey-bd);padding:26px;display:flex;flex-direction:column;gap:12px;align-items:flex-start}
.ac-empty-title{font-size:1.2rem;font-weight:500;letter-spacing:-.02em}
.ac-empty p:not(.ac-empty-title){color:var(--muted);font-size:.92rem}
/* Categories table */
.ac-categories th[scope=row]{white-space:nowrap}
.ac-categories-section .text-link{margin-top:18px}
/* Coats and products */
.ac-products{background:var(--grey-e8e8e6)}
.ac-roles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:start}
.ac-role{background:white;border:1px solid var(--grey-d9);padding:22px;flex-direction:column;border-top:4px solid var(--tone-9aa1a8);display:grid;grid-row:span 4;grid-template-rows:subgrid;gap:12px;align-content:start}
.ac-role--primer{border-top-color:var(--ac-primer)}
.ac-role--intermediate{border-top-color:var(--ac-intermediate)}
.ac-role--finish{border-top-color:var(--red)}
.ac-role-num{font-size:.75rem;color:var(--red);letter-spacing:.04em}
.ac-role h3{font-size:1.3rem;line-height:1.25;letter-spacing:-.03em}
.ac-role>p:not(.ac-role-num){font-size:.9rem;line-height:1.55;color:var(--muted)}
.ac-product-list{list-style:none;margin:6px 0 0;padding:0;border-top:1px solid var(--grey-e6)}
.ac-product{display:grid;grid-template-columns:64px minmax(0,1fr) 18px;gap:14px;align-items:center;padding:12px 0;border-bottom:1px solid var(--grey-e6)}
.ac-product-media{width:64px;height:64px;background:var(--grey-f4f4f3);display:flex;align-items:center;justify-content:center;overflow:hidden}
.ac-product-img{width:100%;height:100%;object-fit:cover}
.ac-product-body{display:flex;flex-direction:column;gap:3px;min-width:0}
.ac-product-body .product-type{margin:0;font-size:.66rem}
.ac-product-name{font-weight:500;line-height:1.3}
.ac-product-dft{font-size:.78rem;color:var(--muted)}
.ac-product .arrow{transition:transform .3s var(--ease,ease)}
.ac-product:hover .arrow{transform:translateX(4px)}
.ac-product:hover .ac-product-name{color:var(--action)}
/* Sectors */
.ac-sectors{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.ac-sector{border-top:2px solid var(--ink);padding-top:18px;flex-direction:column;display:grid;grid-row:span 6;grid-template-rows:subgrid;gap:12px}
.ac-sector-num{font-size:.75rem;color:var(--red);border-top:2px solid var(--ink);padding-top:14px;margin-top:4px}
.ac-sector h3{font-size:1.2rem;line-height:1.3;letter-spacing:-.03em}
.ac-sector>p:not(.ac-sector-num){font-size:.9rem;line-height:1.55;color:var(--muted)}
.ac-sector-structures{margin:0;padding-left:18px;font-size:.88rem;line-height:1.6}
.ac-sector-meta p{font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.ac-sector-cats{list-style:none;margin:0;padding:0;display:flex;gap:6px;flex-wrap:wrap}
.ac-sector-cats a{display:inline-flex;align-items:center;min-height:36px;padding:0 12px;border:1px solid var(--grey-c9);border-radius:100px;font-size:.82rem;font-weight:500}
.ac-sector-cats a:hover{background:var(--ink);color:white;border-color:var(--ink)}
.ac-sector-products{font-size:.84rem;line-height:1.55;margin-top:0}
.ac-sector-products span{color:var(--muted)}
.ac-sector-products a{text-decoration:underline;text-decoration-color:var(--grey-c4);text-underline-offset:3px}
.ac-sectors-section+.ac-topics{padding-top:0}
.ac-topic-grid{grid-template-columns:repeat(5,minmax(0,1fr))}
/* Topic pages */
.ac-topic-systems{margin-top:30px}
.ac-calc-fields{grid-template-columns:repeat(5,minmax(0,1fr))}
/* Labels of one row start together and the fields line up below them, whether a label takes one line or two. */
.ac-calc-fields label{justify-content:space-between}
.ac-calc-fields input{margin-top:auto}
.ac-calc-result{grid-template-columns:repeat(4,minmax(0,1fr))}
.ac-calc-result dd{font-size:1.35rem}
/* Band on the paints and primers pages */
.ac-band{background:var(--ink);color:white}
.ac-band-inner{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px 48px;align-items:end}
.ac-band .eyebrow{color:var(--grey-9a);margin-bottom:16px}
.ac-band h2{font-size:clamp(1.8rem,3vw,3rem)}
.ac-band p:not(.eyebrow){color:var(--grey-c9);margin-top:14px;max-width:62ch}
/* Cards in one row share their inner rows (subgrid): headings, texts, lists and category chips start
   at the same height whatever the length of the text above them. */
.ac-step-list,.ac-sectors,.ac-roles{row-gap:12px;align-items:stretch}
@media(max-width:1150px){
.ac-selector-grid{grid-template-columns:minmax(0,1fr)}
.ac-matrix-col{position:static}
.ac-step-list,.ac-sectors{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 16px}
.ac-step-list li,.ac-sector{padding-bottom:16px}
.ac-roles{row-gap:12px;grid-template-columns:1fr 1fr}
.ac-role{margin-bottom:4px}
.ac-topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.ac-calc-fields{grid-template-columns:repeat(3,minmax(0,1fr))}
.ac-calc-result{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:760px){
.ac-scale li{grid-template-columns:32px minmax(0,1fr) 96px;gap:10px}
.ac-step-list,.ac-sectors,.ac-roles{grid-template-columns:1fr}
.ac-topic-grid{grid-template-columns:1fr}
.ac-finder .finder-row{grid-template-columns:1fr;gap:8px}
.ac-finder .chips{flex-wrap:nowrap;overflow-x:auto;padding-bottom:4px}
.ac-finder .chip{flex-shrink:0}
.ac-system{padding:18px}
.ac-system-head{flex-direction:column-reverse}
.ac-total{text-align:left;grid-template-columns:auto 1fr}
.ac-layer{grid-template-columns:28px minmax(0,1fr);gap:4px 10px}
.ac-layer-role{grid-column:2}
.ac-layer-name{grid-column:2}
.ac-layer-dft{grid-column:2;text-align:left;white-space:normal}
.ac-layer-num{grid-row:1/4}
.ac-spec{grid-template-columns:1fr}
.ac-copy{justify-self:start}
.ac-matrix{font-size:.78rem}
.ac-matrix th,.ac-matrix td{padding:4px 3px}
.ac-matrix th[scope=row]{padding-left:10px}
.ac-matrix-name{display:none}
.ac-matrix-years{font-size:.6rem;white-space:normal}
.ac-cell{min-height:40px;font-size:.68rem;padding:2px 4px}
.ac-calc-fields,.ac-calc-result{grid-template-columns:1fr}
.ac-band-inner{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:no-preference){
.reveal-ready .ac-scale[data-reveal]:not(.is-in) .ac-scale-fill{transform:scaleX(0)}
}
/* Sector photos (o3.com objects): photo on top, the rule moves under it; the photo is one more subgrid row. */
.ac-sector{border-top:0;padding-top:0;grid-row:span 7}
.ac-sector-media{margin:0;aspect-ratio:16/10;overflow:hidden;border-radius:4px;background:var(--grey-e8e8e6)}
.ac-sector-img{display:block;width:100%;height:100%;object-fit:cover}