:root {
  --white: #ffffff;
  --black: #111111;
  --text: #10181b;
  --muted: #4f5d61;
  --dark: #121d20;
  --dark-2: #1b282c;
  --accent: #f5c800;
  --steel: #b9cad0;
  --line: rgba(16, 24, 27, 0.2);
  --radius: 18px;
  --shadow: 0 18px 48px rgba(12, 18, 20, 0.14);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  font-family: "IBM Plex Sans", Arial, sans-serif;
  color: var(--text);
  overflow-x: clip;
  background-attachment: fixed;
  background-color: #eef1f2;
  background-image:
    radial-gradient(900px 560px at 12% 0%, rgba(245,200,0,0.07), transparent 60%),
    radial-gradient(760px 520px at 92% 18%, rgba(23,33,36,0.06), transparent 55%),
    radial-gradient(700px 480px at 8% 78%, rgba(23,33,36,0.05), transparent 55%),
    linear-gradient(rgba(238,241,242,0.7), rgba(238,241,242,0.7)),
    url("img/beton.webp");
  background-repeat: no-repeat, no-repeat, no-repeat, repeat, repeat;
  background-size: auto, auto, auto, auto, 640px 640px;
  background-position: center, center, center, center, center;
}

a {
  color: inherit;
  text-decoration: none;
}

.page {
  width: min(1220px, calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 16px;
  z-index: 20;
  margin-top: 18px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-radius: 999px;
  background: rgba(18, 29, 32, 0.88);
  border: 1px solid rgba(255,255,255,0.12);
  background: #172124;
  box-shadow: 0 16px 44px rgba(0,0,0,0.18);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 160px;
}

.logo img {
  height: 32px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  flex: 1;
  justify-content: center;
  gap: 20px;
  color: rgba(255,255,255,0.72);
  font-size: 14px;
}

.nav-links a:hover {
  color: var(--accent);
}

.nav-menu-toggle {
  display: none;
  border: 0;
  cursor: pointer;
}

.nav-contacts {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.nav-phone,
.nav-request {
  min-height: 42px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.nav-phone {
  color: rgba(255,255,255,0.88);
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.18);
}

.nav-request {
  background: var(--accent);
  color: var(--black);
}

.nav-icon-btn {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: rgba(255,255,255,0.88);
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.18);
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.nav-icon-btn svg {
  width: 20px;
  height: 20px;
}

.nav-phone svg {
  display: none;
  width: 19px;
  height: 19px;
}

@media (hover: hover) {
  .nav-icon-btn:hover {
    background: var(--accent);
    border-color: transparent;
    color: var(--black);
    transform: translateY(-1px);
  }
}

.hero    { padding: 70px 0 34px; }
.section { padding: 54px 0 18px; scroll-margin-top: 96px; }
#contact { scroll-margin-top: 96px; }

.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}

.swipe-hint { display: none; }

.card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(16,24,27,0.08);
  box-shadow: 0 8px 26px rgba(12, 18, 20, 0.08);
  
}

.card > * {
  position: relative;
  z-index: 1;
}

.dark {
  color: #fff;
  border-color: rgba(255,255,255,0.1);
  background: #172124;
}

.dark::before {
  content: "";
  position: absolute;
  inset: -90px;
  z-index: 0;
  background: url("img/beton-bg.webp") center / cover no-repeat;
  opacity: 0.14;
  transform: translate3d(0, 0, 0);
  pointer-events: none;
}

.steel {
  background: var(--steel);
  border-color: rgba(16,24,27,0.22);
  box-shadow: 0 22px 60px rgba(16,24,27,0.2);
}

.steel::before {
  content: "";
  position: absolute;
  inset: -90px;
  z-index: 0;
  background: url("img/betonfon-bg.webp") center / cover no-repeat;
  opacity: 0.32;
  mix-blend-mode: multiply;
  transform: translate3d(0, 0, 0);
  pointer-events: none;
}

.eyebrow {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 20px;
  padding: 9px 13px;
  border-radius: 10px;
  background-color: #f5c800;
  color: var(--black);
  font-size: 20px;
  font-weight: 700;
}

.dark .eyebrow {
  background: rgba(245,200,0,0.14);
  color: var(--accent);
}

.hero-main .hero-eyebrow {
  padding: 0;
  margin-bottom: 14px;
  border-radius: 0;
  background: transparent;
  color: rgba(255,255,255,0.72);
  font-size: 13px;
  letter-spacing: .08em;
  line-height: 1.35;
  text-transform: uppercase;
}

.hero-descriptor {
  display: block;
  margin: -4px 0 18px;
  color: var(--accent);
  font-size: 17px;
  font-weight: 700;
}

.hero-main .hero-subtitle {
  max-width: 760px;
  margin-top: 12px;
  color: rgba(255,255,255,0.92);
  font-size: clamp(22px, 2.4vw, 34px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0;
  text-shadow: none;
}

h1 {
  max-width: 760px;
  font-size: clamp(44px, 6vw, 82px);
  line-height: 0.98;
  letter-spacing: 0;
  font-weight: 800;
}

h2 {
  font-size: clamp(34px, 4vw, 58px);
  line-height: 1.02;
  letter-spacing: 0;
  font-weight: 800;
  text-shadow: 1px 1px 0 rgba(245,200,0,0.38), 2px 2px 0 rgba(16,24,27,0.1);
}

h3 {
  font-size: 24px;
  line-height: 1.12;
  letter-spacing: -0.015em;
  font-weight: 800;
}

p {
  color: #3c484c;
  line-height: 1.6;
  font-size: 17px;
}

.dark p,
.hero-main p {
  color: rgba(255,255,255,0.82);
}

/* Content emphasis: bold weight for key phrases and numbers */
.highlight {
  color: var(--text);
  font-weight: 700;
}

.dark .highlight,
.hero-main .highlight {
  color: #fff;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.section-head p { max-width: 460px; }

.section-lead {
  max-width: 760px !important;
  margin-top: 16px;
  font-size: 18px;
  line-height: 1.55;
}

.material-guide {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 18px;
}

.guide-card {
  min-height: 245px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.guide-card h3 { font-size: 21px; }
.guide-card p { font-size: 15px; line-height: 1.55; }
.guide-number {
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.guide-dark { color: #fff; background: var(--dark); }
.material-guide .guide-dark h3 { color: #fff !important; }
.material-guide .guide-dark p { color: rgba(255,255,255,0.86) !important; }
.guide-steel { background: var(--steel); }

.audience-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.audience-card { min-height: 220px; padding: 26px; }
.audience-number { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .1em; }
.audience-card h3 { margin-top: 18px; font-size: 24px; }
.audience-card p { max-width: 520px; margin-top: 10px; font-size: 16px; line-height: 1.55; }
.audience-card:not(.dark) p { color: var(--muted); }

.mark-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
}

.mark-filter {
  padding: 11px 16px;
  border: 1px solid rgba(16,24,27,0.14);
  border-radius: 999px;
  background: rgba(255,255,255,0.7);
  color: var(--muted);
  font: 700 13px/1.2 "IBM Plex Sans", Arial, sans-serif;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.mark-filter.active {
  background: var(--dark);
  color: var(--accent);
  border-color: var(--dark);
}

.mark-filter:hover { transform: translateY(-1px); }
.mark-card.filter-hidden { display: none; }

.material-selector {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 18px;
}

.selector-choices {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.selector-step-label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.selector-result .selector-step-label {
  grid-column: 1 / -1;
  color: var(--accent);
}

.selector-result.is-hidden { display: none; }

.selector-choice {
  padding: 17px 18px;
  border: 1px solid rgba(16,24,27,0.12);
  border-radius: 14px;
  background: rgba(255,255,255,0.72);
  color: var(--text);
  font: 700 15px/1.25 "IBM Plex Sans", Arial, sans-serif;
  text-align: left;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.selector-choice.active {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateX(6px);
}

.selector-result {
  min-height: 350px;
  padding: 34px;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 28px;
  align-items: start;
  background-image: linear-gradient(90deg, rgba(18,29,32,0.86), rgba(18,29,32,0.58));
  background-position: center;
  background-size: cover;
}

.selector-result::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--selector-photo, none) center / cover no-repeat;
  opacity: 0.28;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

@media (hover: hover) and (pointer: fine) {
  .selector-result:hover::after { opacity: 0.36; }
}

.selector-result-mark {
  padding: 12px 10px;
  border-radius: 12px;
  background: rgba(245,200,0,0.16);
  color: var(--accent);
  font-size: 14px;
  font-weight: 800;
  text-align: center;
}

.selector-kicker { color: rgba(255,255,255,0.55); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; }
.selector-title { max-width: 680px; margin-top: 8px; font-size: clamp(25px, 3vw, 40px); }
.selector-description { max-width: 690px; margin-top: 14px; }
.selector-benefits { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-top: 24px; }
.selector-benefits > div { padding: 14px; border: 1px solid rgba(255,255,255,0.14); border-radius: 14px; }
.selector-benefits strong, .selector-benefits span { display: block; }
.selector-benefits strong { color: var(--accent); font-size: 15px; }
.selector-benefits span { margin-top: 5px; color: rgba(255,255,255,0.62); font-size: 13px; }
.selector-link { margin-top: 22px; }
.selector-changing { animation: selectorChange 0.3s ease; }

.solution-schemes { scroll-margin-top: 100px; }
.solution-schemes .section-head { align-items: end; }
.text-link { font-weight: 700; color: var(--dark); white-space: nowrap; }
.text-link span { color: #9a7d00; margin-left: 4px; }
.scheme-explorer { margin-top: 28px; }
.scheme-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.scheme-tab { border: 1px solid rgba(16,24,27,.18); border-radius: 999px; padding: 11px 16px; background: rgba(255,255,255,.46); color: var(--text); font: inherit; font-weight: 700; cursor: pointer; transition: .2s ease; }
.scheme-tab:hover, .scheme-tab.active { background: var(--dark); color: #fff; border-color: var(--dark); }
.solution-card { padding: clamp(22px, 4vw, 52px); display: grid; grid-template-columns: minmax(0, .9fr) minmax(350px, 1.1fr); gap: clamp(28px, 5vw, 76px); overflow: hidden; }
.scheme-number { color: var(--accent); display: block; font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.scheme-title { margin-top: 14px; font-size: clamp(27px, 3.2vw, 45px); line-height: 1.03; max-width: 580px; }
.scheme-description { color: rgba(255,255,255,.66); margin-top: 16px; max-width: 530px; }
.scheme-steps { list-style: none; margin-top: 28px; display: grid; gap: 12px; }
.scheme-steps li { display: flex; align-items: center; gap: 12px; padding-bottom: 12px; border-bottom: 1px solid rgba(255,255,255,.13); }
.scheme-steps span { flex: 0 0 auto; color: var(--accent); font-size: 12px; font-weight: 800; }
.scheme-steps strong { font-size: 15px; }
.scheme-link { margin-top: 28px; }
.scheme-drawing { min-height: 440px; display: grid; grid-template-columns: .55fr 1.45fr; grid-template-rows: 1fr auto; gap: 13px; padding: 18px; border-radius: 20px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.11); }
.scheme-water { position: relative; border-radius: 12px; background: linear-gradient(155deg, #347b98, #163e55); overflow: hidden; }
.scheme-water::after { content: ""; position: absolute; width: 140%; height: 32px; left: -20%; top: 16%; border-radius: 50%; border-top: 2px solid rgba(255,255,255,.38); box-shadow: 0 34px 0 rgba(255,255,255,.24), 0 68px 0 rgba(255,255,255,.18), 0 102px 0 rgba(255,255,255,.16), 0 136px 0 rgba(255,255,255,.12); transform: rotate(-8deg); }
.scheme-water span { position: absolute; z-index: 1; left: 13px; bottom: 13px; color: rgba(255,255,255,.8); font-weight: 700; writing-mode: vertical-rl; }
.scheme-wall { min-height: 350px; position: relative; display: grid; grid-template-columns: 24% 1fr; grid-template-rows: 1fr; overflow: hidden; border-radius: 12px; background-color: #7e8c8f; background-image: radial-gradient(circle at 20% 22%, rgba(255,255,255,.21) 0 2px, transparent 3px), radial-gradient(circle at 69% 45%, rgba(0,0,0,.13) 0 2px, transparent 3px), radial-gradient(circle at 47% 77%, rgba(255,255,255,.14) 0 3px, transparent 4px); background-size: 38px 44px, 51px 53px, 59px 61px; }
.scheme-layer { position: relative; z-index: 1; display: flex; align-items: flex-end; padding: 13px; font-size: 12px; font-weight: 800; line-height: 1.1; }
.scheme-layer-protection { color: #272100; background: var(--accent); }
.scheme-layer-base { color: #fff; grid-column: 2; grid-row: 1; }
.scheme-layer-joint { color: #fff; position: absolute; z-index: 3; left: 20%; right: 0; top: 56%; height: 42px; padding: 0 13px; align-items: center; background: #293b40; border-top: 2px solid #dbe6e7; border-bottom: 2px solid #dbe6e7; }
.scheme-legend { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 15px; font-size: 12px; color: rgba(255,255,255,.72); }
.scheme-legend span { display: flex; gap: 7px; align-items: center; }
.scheme-legend i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.scheme-legend b { color: inherit; }
.legend-protection { background: var(--accent); }.legend-base { background: #8c9a9b; }.legend-joint { background: #dbe6e7; }
.scheme-disclaimer { margin-top: 14px; color: var(--muted); font-size: 13px; }
.scheme-changing { animation: selectorChange .3s ease; }

@media (max-width: 980px) {
  .solution-schemes .section-head { align-items: start; }
  .solution-card { grid-template-columns: 1fr; }
  .scheme-drawing { min-height: 380px; }
}

@media (max-width: 620px) {
  .text-link { margin-top: 10px; }
  .scheme-tabs { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px; }
  .scheme-tab { white-space: nowrap; padding: 10px 14px; font-size: 13px; }
  .scheme-drawing { min-height: 310px; padding: 12px; }
  .scheme-wall { min-height: 245px; }
  .scheme-layer { padding: 9px; font-size: 10px; }
  .scheme-layer-joint { height: 36px; font-size: 10px; }
  .scheme-legend { gap: 9px; font-size: 10px; }
}

@keyframes selectorChange { from { opacity: 0.35; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.comparison-table { overflow: hidden; }
.comparison-row { display: grid; grid-template-columns: 1fr 1.2fr 1.4fr; gap: 20px; padding: 18px 24px; border-bottom: 1px solid rgba(16,24,27,0.09); font-size: 15px; line-height: 1.45; }
.comparison-row:last-child { border-bottom: 0; }
.comparison-heading { background: var(--dark); color: rgba(255,255,255,0.68); font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.06em; }
.comparison-good { color: #18734b; font-weight: 700; }

.project-gallery {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.project-shot {
  min-width: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(16,24,27,0.1);
  box-shadow: 0 8px 26px rgba(12,18,20,0.08);
}

.project-shot img {
  display: block;
  width: 100%;
  height: 210px;
  object-fit: cover;
}

.project-shot-scheme img { object-fit: contain; background: #e7ebec; }
.project-shot figcaption { min-height: 112px; padding: 16px; }
.project-shot figcaption strong { display: block; font-size: 16px; }
.project-shot figcaption span { display: block; margin-top: 7px; color: var(--muted); font-size: 13px; line-height: 1.45; }

@media (max-width: 980px) {
  .project-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .project-gallery {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding: 2px 2px 14px;
    scroll-snap-type: x mandatory;
  }

  .project-shot {
    flex: 0 0 min(294px, calc(100vw - 56px));
    scroll-snap-align: start;
  }

}

.diagnostic-note {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 28px 0 0;
  padding: 15px 18px;
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  background: rgba(245,200,0,0.12);
  color: var(--text);
  font-size: 14px;
  line-height: 1.45;
}

.diagnostic-note span { color: var(--muted); }

.technology-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.technology-step {
  min-height: 210px;
  padding: 24px;
}

.technology-step > span {
  color: #9a7d00;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
}

.technology-step h3 { margin-top: 22px; }
.technology-step p { margin-top: 10px; font-size: 15px; line-height: 1.5; }
.technology-step.dark > span { color: var(--accent); }
.technology-step.dark p { color: rgba(255,255,255,.82); }
.technology-step-result { border: 2px solid var(--accent); }

@media (max-width: 820px) {
  .technology-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .technology-grid { grid-template-columns: 1fr; }
  .technology-step { min-height: 0; }
}

.choice-route {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 12px;
  align-items: stretch;
}

.choice-step {
  min-height: 170px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.choice-step span { color: var(--accent); font-size: 13px; font-weight: 800; }
.choice-step strong { font-size: 20px; }
.choice-step p { font-size: 14px; line-height: 1.45; }
.choice-step-dark p { color: rgba(255,255,255,0.76); }
.choice-step-accent { background: rgba(245,200,0,0.2); border-color: rgba(245,200,0,0.45); }
.choice-step-accent p { color: #3c484c; }
.choice-arrow { align-self: center; color: var(--accent); font-size: 28px; font-style: normal; font-weight: 800; }

.mark-card:not(.open) .mark-toggle { padding-top: 16px; padding-bottom: 16px; }
.mark-card:not(.open) .mark-toggle-text .mark-tagline { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.local-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px;
  padding-top: 18px;
  padding-bottom: 18px;
}

.local-nav-title {
  margin-right: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.local-nav a {
  padding: 10px 14px;
  border: 1px solid rgba(16,24,27,0.14);
  border-radius: 999px;
  background: rgba(255,255,255,0.72);
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  transition: background 0.18s ease, transform 0.18s ease;
}

.local-nav a:hover {
  background: var(--accent);
  transform: translateY(-1px);
}

.certificates-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.review-card {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 8px;
  border: 1px solid rgba(16,24,27,0.14);
  border-radius: 14px;
  background: rgba(255,255,255,0.86);
  box-shadow: 0 6px 22px rgba(12,18,20,0.07);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.review-card img {
  width: 100%;
  aspect-ratio: 1.18;
  object-fit: cover;
  display: block;
  background: #f7f8f8;
}

.review-card span {
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
}

@media (hover: hover) and (pointer: fine) {
  .review-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
  }
}

.certificate-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 12px;
  border: 1px solid rgba(16,24,27,0.14);
  border-radius: 14px;
  background: rgba(255,255,255,0.86);
  box-shadow: 0 6px 22px rgba(12,18,20,0.07);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.certificate-card img {
  width: 100%;
  aspect-ratio: 0.72;
  object-fit: contain;
  display: block;
  background: #f7f8f8;
}

.certificate-card span {
  min-height: 38px;
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.3;
}

.certificate-viewer-open { overflow: hidden; }

.certificate-viewer {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.certificate-viewer.is-open { opacity: 1; visibility: visible; }

.certificate-viewer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10,16,18,0.82);
}

.certificate-viewer-topbar {
  position: absolute;
  inset: 0 0 auto;
  z-index: 3;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  background: rgba(10,16,18,0.72);
  color: rgba(255,255,255,0.78);
}

.certificate-viewer-count { font-size: 14px; font-weight: 700; }

.certificate-viewer-topbar .certificate-viewer-toolbar {
  position: static;
  transform: none;
}

.certificate-viewer-nav {
  position: absolute;
  top: 50%;
  z-index: 3;
  width: 44px;
  height: 56px;
  border: 0;
  background: rgba(10,16,18,0.68);
  color: #fff;
  font-size: 42px;
  line-height: 1;
  cursor: pointer;
  transform: translateY(-50%);
}

.certificate-viewer-nav:hover { background: var(--accent); color: var(--black); }
.certificate-viewer-prev { left: 8px; }
.certificate-viewer-next { right: 8px; }

.certificate-viewer-dialog {
  position: relative;
  z-index: 1;
  max-width: min(680px, 92vw);
  max-height: 92vh;
  padding: 18px;
  overflow: auto;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 14px;
  background: #f7f8f8;
  box-shadow: 0 24px 70px rgba(0,0,0,0.35);
}

.certificate-viewer-image {
  display: block;
  width: 100%;
  max-height: 78vh;
  object-fit: contain;
  transform-origin: center center;
  transition: transform 0.18s ease;
}

.certificate-viewer-toolbar {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border-radius: 8px;
  background: rgba(23,33,36,0.9);
  color: #fff;
}

.certificate-viewer-toolbar button {
  width: 30px;
  height: 30px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: #fff;
  font-size: 21px;
  line-height: 1;
  cursor: pointer;
}

.certificate-viewer-toolbar button:hover { background: rgba(255,255,255,0.16); }
.certificate-viewer-zoom { min-width: 42px; text-align: center; font-size: 12px; font-weight: 700; }

.certificate-viewer-canvas {
  max-height: 78vh;
  overflow: auto;
  cursor: default;
  touch-action: none;
}

.certificate-viewer-canvas.is-pannable { cursor: grab; }
.certificate-viewer-canvas.is-dragging { cursor: grabbing; }

.certificate-viewer-caption {
  margin-top: 12px;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

.certificate-viewer-close {
  position: static;
  z-index: 2;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(16,24,27,0.18);
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  color: var(--text);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.certificate-viewer-topbar .certificate-viewer-close { flex-shrink: 0; }

.home-page .feature-water-photo::before,
.home-page .feature-corrosion-photo::before,
.home-page .feature-application-photo::before,
.home-page .feature-winter-photo::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-position: center;
  background-size: cover;
  opacity: 0.55;
  pointer-events: none;
}

.home-page .feature-water-photo::before {
  background-image: linear-gradient(rgba(255,255,255,0.42), rgba(255,255,255,0.42)), url("img/5244646202681272893.webp");
}

.home-page .feature-corrosion-photo::before {
  background-image: linear-gradient(rgba(23,33,36,0.48), rgba(23,33,36,0.48)), url("img/5244646202681272888.webp");
}

.home-page .feature-application-photo::before {
  background-image: linear-gradient(rgba(255,255,255,0.5), rgba(255,255,255,0.5)), url("img/nanesenie.webp");
}

.home-page .feature-winter-photo::before {
  background-image: linear-gradient(rgba(23,33,36,0.52), rgba(23,33,36,0.52)), url("img/u.webp");
}

@media (hover: none), (pointer: coarse), (max-width: 1024px) {
  .home-page .feature-water-photo::before,
  .home-page .feature-corrosion-photo::before,
  .home-page .feature-application-photo::before,
  .home-page .feature-winter-photo::before {
    content: "" !important;
    background-position: center !important;
    background-size: cover !important;
    opacity: 0.42 !important;
    display: block !important;
  }

  .home-page .feature-water-photo::before {
    background-image: linear-gradient(rgba(255,255,255,0.52), rgba(255,255,255,0.52)), url("img/5244646202681272893.webp") !important;
  }

  .home-page .feature-corrosion-photo::before {
    background-image: linear-gradient(rgba(23,33,36,0.56), rgba(23,33,36,0.56)), url("img/5244646202681272888.webp") !important;
  }

  .home-page .feature-application-photo::before {
    background-image: linear-gradient(rgba(255,255,255,0.58), rgba(255,255,255,0.58)), url("img/nanesenie.webp") !important;
  }

  .home-page .feature-winter-photo::before {
    background-image: linear-gradient(rgba(23,33,36,0.6), rgba(23,33,36,0.6)), url("img/u.webp") !important;
  }
}

/* Фон главного hero: без подмены текстурой на разных устройствах. */
.home-page .hero-main {
  background:
    linear-gradient(90deg, rgba(18,29,32,.88) 0%, rgba(18,29,32,.78) 56%, rgba(18,29,32,.62) 100%),
    url("img/каталог формула бетона.jpg") center / cover no-repeat !important;
}

.home-page .hero-main::before {
  display: none !important;
}

/* Смена текста в hero сопровождается движением самого фонового кадра. */
.home-page .hero-main.hero-copy-transition::after {
  animation: heroBackgroundDim .48s ease both;
}

@keyframes heroBackgroundDim {
  0%, 100% { opacity: 0; }
  48% { opacity: .22; }
}

/* На светлых карточках текст всегда остаётся контрастным. */
.card:not(.dark):not(.hero-main) :is(h1, h2, h3, h4, p, li) {
  color: var(--text);
}

.instruction-backdrop {
  position: fixed;
  inset: 0;
  z-index: 80;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  background: rgba(16,24,27,0.16);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  transition: opacity .22s ease, visibility 0s linear .22s;
}

body.instruction-modal-open { overflow: hidden; }
body.instruction-modal-open .instruction-backdrop { opacity: 1; visibility: visible; pointer-events: auto; transition-delay: 0s; }
body.instruction-modal-open .nav { z-index: 3; }

.instruction-card.is-open {
  position: fixed;
  z-index: 81;
  top: 15vh;
  left: 50%;
  width: min(1040px, calc(100vw - 48px));
  max-height: calc(84vh - 40px);
  overflow: visible;
  transform: translateX(-50%);
  border-color: rgba(245,200,0,0.62);
  box-shadow: 0 16px 30px rgba(16,24,27,0.15), 0 0 0 2px rgba(245,200,0,0.1);
  animation: instructionModalIn .26s cubic-bezier(.22,.61,.36,1) both;
}

.instruction-card.is-open .instruction-card-toggle { min-height: 78px; padding: 22px 26px; border-radius: var(--radius); }
.instruction-card.is-open .instruction-card-body { position: relative; display: block; max-height: calc(84vh - 118px); overflow: auto; overscroll-behavior: contain; padding: 0 28px 28px; background: #fff; }
.instruction-card-close { position: absolute; top: 14px; right: 18px; width: 34px; height: 34px; border: 0; border-radius: 50%; background: rgba(16,24,27,0.06); color: var(--dark); font-size: 25px; line-height: 1; cursor: pointer; transition: background .18s ease, color .18s ease; }
.instruction-card-close:hover { background: var(--accent); color: var(--black); }
.instruction-card.is-open .instruction-card-summary { padding-right: 46px; }

@keyframes instructionModalIn {
  from { opacity: 0; transform: translate(-50%, 18px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

@media (max-width: 1180px) and (min-width: 981px) {
  .instruction-card.is-open { top: 8vh; left: 24px; right: 24px; width: auto; max-height: calc(84vh - 20px); transform: none; }
}

@media (max-width: 980px) and (min-width: 621px) {
  .instruction-card.is-open { top: 8vh; left: 20px; right: 20px; width: auto; max-height: calc(84vh - 20px); transform: none; }
}

@media (max-width: 700px) {
  .instruction-card.is-open { top: 10vh; left: 12px; right: 12px; width: auto; max-height: calc(80vh - 20px); transform: none; animation: none; }
  .instruction-card.is-open .instruction-card-body { max-height: calc(84vh - 98px); padding: 0 18px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  .home-page .hero-main.hero-copy-transition,
  .instruction-card.is-open { animation: none; }
}

.home-page .hero-main {
  background:
    linear-gradient(90deg, rgba(18,29,32,.88) 0%, rgba(18,29,32,.78) 56%, rgba(18,29,32,.62) 100%),
    url("img/каталог формула бетона.jpg") center / cover no-repeat !important;
}

@media (max-width: 620px) {
  .marks-grid,
  .mark-card,
  .mark-card:not(.open) .mark-toggle {
    width: 100%;
    max-width: 100%;
    min-width: 0;
  }

  .mark-card:not(.open) .mark-toggle {
    padding-left: 10px;
    padding-right: 10px;
    gap: 7px;
    overflow: hidden;
  }

  .mark-card:not(.open) .mark-badge {
    flex: 0 0 58px;
    min-width: 58px !important;
    width: 58px;
    padding: 5px 6px;
    font-size: 10px;
    line-height: 1.05;
    text-align: center;
    white-space: normal;
    overflow-wrap: anywhere;
  }

  .mark-card:not(.open) .mark-toggle-text {
    min-width: 0;
    overflow: hidden;
  }

  .mark-card:not(.open) .mark-toggle-text .mark-name,
  .mark-card:not(.open) .mark-toggle-text .mark-tagline {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .mark-card:not(.open) .mark-chevron {
    flex: 0 0 24px;
  }
}

/* Touch previews can report a desktop viewport while still rendering in a narrow frame. */
@media (hover: none), (pointer: coarse) {
  .mark-card.open {
    position: fixed !important;
    top: 8vh !important;
    left: 12px !important;
    right: 12px !important;
    width: auto !important;
    transform: none !important;
    animation: markModalCardIn .28s cubic-bezier(.22,.61,.36,1) both;
  }

  .mark-card.open .mark-body {
    left: 0 !important;
    right: auto !important;
    width: 100% !important;
    max-height: calc(84vh - 100px) !important;
    animation: markModalBodyIn .34s cubic-bezier(.22,.61,.36,1) both;
  }
}

@media (max-width: 620px) {
  .mark-card.open {
    animation-duration: .22s;
    box-sizing: border-box;
    max-width: calc(100vw - 24px);
    overflow: visible;
  }

  .mark-card.open .mark-body {
    animation-duration: .26s;
    box-sizing: border-box;
    overflow-x: hidden;
  }

  .mark-card.open .mark-toggle {
    min-width: 0;
  }

  .mark-card.open .mark-toggle-text,
  .mark-card.open .mark-toggle-text .mark-name,
  .mark-card.open .mark-toggle-text .mark-tagline {
    min-width: 0;
    max-width: 100%;
    overflow-wrap: anywhere;
  }

  .mark-card.open .mark-content {
    grid-template-columns: minmax(0, 1fr);
    width: auto;
    margin-left: 16px;
    margin-right: 16px;
    padding-left: 0;
    padding-right: 0;
  }

  .mark-card.open .mark-meta-row,
  .mark-card.open .mark-application ol {
    grid-template-columns: minmax(0, 1fr);
  }

  .mark-card:not(.open) .mark-toggle {
    padding: 11px 12px;
    gap: 8px;
  }

  .mark-card:not(.open) .mark-badge {
    min-width: 62px;
    padding: 6px 8px;
    font-size: 10.5px;
  }

  .mark-card:not(.open) .mark-toggle-text .mark-name {
    font-size: 14px;
  }

  .mark-card:not(.open) .mark-toggle-text .mark-tagline {
    margin-top: 2px;
    font-size: 11px;
  }

  .mark-card:not(.open) .mark-chevron {
    width: 24px;
    height: 24px;
    font-size: 15px;
  }
}

@keyframes markModalCardIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes markModalBodyIn {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 620px) {
  .certificate-viewer { padding: 10px; }
  .certificate-viewer-dialog { max-width: 96vw; padding: 12px; }
  .certificate-viewer-image { max-height: 82vh; }
  .certificate-viewer-topbar { height: 52px; padding: 0 10px; }
  .certificate-viewer-nav { width: 36px; height: 48px; font-size: 34px; }
}

@media (hover: hover) and (pointer: fine) {
  .certificate-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
  }
}

@media (max-width: 980px) {
  .certificates-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .reviews-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .reviews-grid {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 5px;
    scrollbar-width: none;
  }

  .reviews-grid::-webkit-scrollbar { display: none; }
  .review-card { flex: 0 0 62%; scroll-snap-align: start; }

  .certificates-grid {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 5px;
    scrollbar-width: none;
  }

  .certificates-grid::-webkit-scrollbar { display: none; }

  .certificate-card {
    flex: 0 0 72%;
    scroll-snap-align: start;
  }
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.case-card { padding: 16px; }
.case-card h3 { margin: 18px 10px 0; font-size: 22px; }
.case-card p { margin: 8px 10px 10px; font-size: 15px; line-height: 1.55; }
.case-card-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 15px;
  border: 1px solid var(--dark);
  border-radius: 999px;
  background: var(--dark);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  transition: transform .18s ease, background .18s ease, color .18s ease, border-color .18s ease;
}

.case-card-link { margin: 8px 10px 4px; }
.case-card.dark .case-card-link { border-color: var(--accent); background: var(--accent); color: var(--black); }
.case-card-link:hover { transform: translateY(-2px); background: var(--accent); border-color: var(--accent); color: var(--black); }
.case-placeholder {
  position: relative;
  height: 210px;
  display: flex;
  align-items: end;
  padding: 16px;
  overflow: hidden;
  border-radius: 20px;
  background: #aebbbe;
}

.case-placeholder-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.72) contrast(1.05);
}

.case-placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(17,29,32,0.04), rgba(17,29,32,0.58));
  pointer-events: none;
}

.case-placeholder::before,
.case-placeholder::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.case-placeholder span {
  position: relative;
  z-index: 1;
  padding: 8px 10px;
  border-radius: 8px;
  background: rgba(17,29,32,0.86);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
}

.case-placeholder span { z-index: 2; }

.case-water { background: linear-gradient(145deg, #77888c 0 45%, #cad4d5 45%); }
.case-water::before { left: 22%; top: 8%; width: 8px; height: 170px; background: #438fa8; transform: rotate(18deg); box-shadow: 28px 16px 0 #438fa8, 52px 4px 0 #438fa8; }
.case-crack { background: #c4cccd; }
.case-crack::before { left: 48%; top: 0; width: 5px; height: 220px; background: #4c5c60; transform: rotate(20deg); box-shadow: 12px 85px 0 #4c5c60; }
.case-crack::after { left: 44%; top: 46%; width: 70px; height: 5px; background: #4c5c60; transform: rotate(-28deg); }
.case-joint { background: linear-gradient(90deg, #c7d0d1 0 44%, #f5c800 44% 49%, #829397 49%); }
.case-joint::before { left: 12%; right: 12%; bottom: 28%; height: 12px; border-top: 3px solid rgba(17,29,32,0.55); border-bottom: 3px solid rgba(17,29,32,0.55); }
.case-mix { background: #b8c6c8; }
.case-mix::before { width: 70px; height: 70px; left: 18%; top: 22%; border-radius: 50%; background: #637479; box-shadow: 90px 36px 0 #76878a, 145px -22px 0 #526469; }
.case-strength { background: linear-gradient(145deg, #707f82, #cad4d4); }
.case-strength::before { left: 24%; top: 18%; width: 52%; height: 62%; border: 7px solid #526469; transform: rotate(-9deg); }
.case-strength::after { left: 47%; top: 11%; width: 5px; height: 150px; background: #f5c800; transform: rotate(24deg); }
.case-frost { background: linear-gradient(160deg, #9eb9c8, #e2ecee); }
.case-frost::before { left: 12%; right: 12%; bottom: 22%; height: 42px; border-radius: 50% 50% 0 0; background: #66787d; }
.case-frost::after { left: 20%; top: 18%; width: 60%; height: 4px; background: rgba(255,255,255,0.8); box-shadow: 24px 24px rgba(255,255,255,0.8), -18px 46px rgba(255,255,255,0.8); transform: rotate(-18deg); }
.case-acid { background: linear-gradient(145deg, #657579, #c4d0d0); }
.case-acid::before { left: 30%; top: 16%; width: 42%; height: 58%; border-radius: 10px 10px 35% 35%; background: #d3dfdf; border: 6px solid #536468; }
.case-acid::after { left: 42%; top: 24%; width: 16%; height: 24%; border-radius: 50%; background: #f5c800; opacity: 0.8; }
.case-porous { background: #b8c5c6; }
.case-porous::before { inset: 18%; border-radius: 50%; background: rgba(17,29,32,0.2); box-shadow: 62px 12px 0 rgba(17,29,32,0.18), 28px 74px 0 rgba(17,29,32,0.15), 110px 82px 0 rgba(17,29,32,0.2); }
.case-two-layers { background: linear-gradient(90deg, #9baaae 0 54%, #f5c800 54% 59%, #d7e0df 59%); }
.case-two-layers::before { left: 18%; right: 18%; top: 24%; bottom: 24%; border: 4px solid #526469; }

.scheme-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.scheme-card {
  padding: 18px;
}

.scheme-card h3 {
  margin-top: 10px;
  font-size: 22px;
}

.scheme-card p {
  margin-top: 9px;
  font-size: 15px;
}

.scheme-label {
  display: block;
  margin-top: 18px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.dark .scheme-label { color: var(--accent); }

.scheme-visual {
  position: relative;
  height: 190px;
  overflow: hidden;
  border-radius: 20px;
  background: #b8c5c8;
}

.concrete-visual::before,
.concrete-visual::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(23,33,36,0.16);
}

.concrete-visual::before { width: 70px; height: 70px; left: 18%; top: 18%; }
.concrete-visual::after { width: 42px; height: 42px; right: 18%; bottom: 18%; }

.penetration-visual { background: linear-gradient(90deg, #9eabad 0 48%, #d6dfe0 48%); }
.water-line { position: absolute; left: 8%; width: 34%; height: 4px; border-radius: 4px; background: #3a91b2; transform: rotate(-16deg); }
.line-one { top: 34%; }.line-two { top: 49%; left: 14%; }.line-three { top: 64%; left: 6%; }
.scheme-arrow { position: absolute; left: 43%; top: 40%; color: var(--accent); font-size: 42px; font-weight: 800; }
.scheme-core, .mix-badge, .surface-badge { position: absolute; z-index: 1; padding: 10px 12px; border-radius: 10px; background: var(--dark); color: var(--accent); font-size: 13px; font-weight: 800; }
.scheme-core { right: 10%; top: 42%; }

.mix-visual { background: #c7ced0; }
.aggregate { position: absolute; border-radius: 50%; background: #69797d; box-shadow: inset 5px 5px 0 rgba(255,255,255,0.18); }
.aggregate-one { width: 58px; height: 58px; left: 14%; top: 25%; }.aggregate-two { width: 42px; height: 42px; right: 16%; top: 18%; }.aggregate-three { width: 70px; height: 70px; right: 30%; bottom: 12%; }
.mix-badge { left: 50%; top: 42%; transform: translateX(-50%); white-space: nowrap; }

.surface-visual { background: #a9babd; }
.surface-wall { position: absolute; inset: 15% 15% 15% 20%; border: 5px solid #68787b; background: #c6d0d1; }
.surface-coating { position: absolute; top: 15%; bottom: 15%; left: 20%; width: 12px; background: var(--accent); }
.surface-arrow { position: absolute; left: 3%; top: 38%; color: var(--dark); font-size: 42px; font-weight: 800; }
.surface-badge { right: 9%; bottom: 20%; }

.hero-main {
  grid-column: span 7;
  min-height: 560px;
  padding: 42px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #172124;
  color: #fff;
  animation: softFadeUp 0.55s ease both;
}

.home-page .hero-main {
  grid-column: span 12;
  min-height: 560px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  grid-template-rows: 1fr auto;
  column-gap: 34px;
  background: #172124;
  border-color: transparent;
}

.hero-copy-content { grid-column: 1; grid-row: 1 / -1; }

.hero-inline-video {
  position: relative;
  min-height: 300px;
  overflow: hidden;
  align-self: stretch;
  border-radius: 14px;
  background: #000;
}

.hero-inline-video .hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  opacity: 1;
  transition: opacity 0.28s ease, filter 0.28s ease;
}

.hero-inline-video .hero-video.video-changing {
  opacity: 0.12;
  filter: blur(2px);
}

.home-page .hero-bottom {
  grid-column: 2;
  grid-row: 2;
  align-self: end;
}

.hero-stats-row {
  grid-column: span 12;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.hero-stats-row .mini { min-height: 190px; }

.hero-main::before {
  content: "";
  position: absolute;
  inset: -90px;
  z-index: 0;
  background: url("img/beton-bg.webp") center / cover no-repeat;
  opacity: 0.16;
  transform: translate3d(0, var(--py, 0px), 0);
  pointer-events: none;
}

.home-page .hero-main::before {
  background-image: linear-gradient(90deg, rgba(18,29,32,.9) 4%, rgba(18,29,32,.7) 54%, rgba(18,29,32,.28)), url("img/каталог формула бетона.jpg");
  background-position: center;
  background-size: cover;
  opacity: 1;
}

/* Главный экран: фото остаётся видимым и на устройствах, где отключаются псевдоэлементы. */
.home-page .hero-main {
  background-color: #172124 !important;
  background-image:
    linear-gradient(90deg, rgba(18,29,32,.82) 4%, rgba(18,29,32,.56) 54%, rgba(18,29,32,.18)),
    url("img/каталог формула бетона.jpg") !important;
  background-position: center !important;
  background-size: cover !important;
}

.home-page .hero-main.hero-copy-transition::before {
  animation: heroBackdropPulse 0.45s ease;
}

@keyframes heroBackdropPulse {
  0% { filter: brightness(1) saturate(1); }
  45% { filter: brightness(1.16) saturate(1.08); }
  100% { filter: brightness(1) saturate(1); }
}

.hero-main h1 { max-width: 650px; font-size: clamp(36px, 4.7vw, 64px); }

.hero-text {
  max-width: 620px;
  margin-top: 24px;
  font-size: 19px;
}

.hero-copy-slider {
  position: relative;
  min-height: 174px;
  max-width: 650px;
  margin-top: 24px;
}

.hero-copy-slider:focus-visible {
  outline: none;
}

.hero-copy-slide {
  display: none;
}

.hero-copy-slide.is-active {
  display: block;
  animation: heroCopyIn .42s cubic-bezier(.22,.8,.25,1) both;
}

.hero-copy-slide.is-leaving {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: block;
  pointer-events: none;
  animation: heroCopyOut .28s ease both;
}

.hero-copy-slide.is-entering .hero-copy-title {
  animation: heroCopyAccent .5s ease both;
}

.hero-copy-title {
  display: inline-block;
  color: var(--accent);
  font-size: 26px;
  font-weight: 800;
  text-decoration: underline;
  text-decoration-color: rgba(245,200,0,0.42);
  text-underline-offset: 5px;
}

.hero-copy-title:hover { color: #fff; }

.hero-copy-slider .hero-text {
  margin-top: 12px;
}

.hero-copy-progress {
  display: flex;
  gap: 6px;
  align-items: center;
}

.hero-copy-progress button {
  position: relative;
  width: auto;
  min-height: 32px;
  padding: 0 3px 9px;
  border: 0;
  border-bottom: 3px solid rgba(255,255,255,0.3);
  border-radius: 0;
  background: transparent;
  color: rgba(255,255,255,0.56);
  font: 700 11px/1 "IBM Plex Sans", Arial, sans-serif;
  cursor: pointer;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.hero-copy-progress button::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -3px;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--accent);
}

.hero-copy-progress button.is-active {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.hero-copy-progress button.is-active::after {
  animation: heroCopyProgress 6.5s linear forwards;
  box-shadow: 0 0 8px rgba(245,200,0,0.72);
}

.hero-copy-slider button:focus-visible {
  outline: 1px solid rgba(255,255,255,0.72);
  outline-offset: 3px;
}

.hero-copy-slider.is-paused .hero-copy-progress button.is-active::after {
  animation-play-state: paused;
}

@keyframes heroCopyProgress {
  from { width: 0; }
  to { width: 100%; }
}

.hero-copy-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
}

.hero-copy-arrow {
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid rgba(255,255,255,0.24);
  border-radius: 50%;
  background: transparent;
  color: #fff;
  font-size: 22px;
  line-height: 20px;
  cursor: pointer;
}

.hero-copy-arrow:hover {
  border-color: var(--accent);
  color: var(--accent);
}

@keyframes heroCopyIn {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes heroCopyOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(-10px); }
}

@keyframes heroCopyAccent {
  from { opacity: 0; transform: translateX(-12px); }
  to { opacity: 1; transform: translateX(0); }
}

.hero-copy-transition .hero-copy-controls {
  animation: heroControlsPulse .42s ease both;
}

@keyframes heroControlsPulse {
  50% { transform: translateX(4px); }
}

@media (prefers-reduced-motion: reduce) {
  .hero-copy-slide.is-active,
  .hero-copy-slide.is-leaving,
  .hero-copy-slide.is-entering .hero-copy-title,
  .hero-copy-transition .hero-copy-controls {
    animation: none;
  }

  .hero-copy-progress button.is-active::after {
    animation: none;
    width: 100%;
  }
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-bottom { max-width: 640px; }
.hero-bottom .hero-actions { margin-top: 22px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.hero-bottom .hero-actions .btn { width: 100%; min-width: 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 20px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.btn-primary  { background: var(--accent); color: var(--black); }
.consultation-btn {
  text-align: center;
  line-height: 1.15;
}

.btn-secondary {
  background: rgba(255,255,255,0.14);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.28);
}

.btn-full {
  width: 100%;
  border: none;
  cursor: pointer;
  margin-top: 4px;
  box-shadow: 0 16px 36px rgba(245,200,0,0.28);
}

.btn-full:disabled { opacity: 0.65; cursor: not-allowed; box-shadow: none; }

@media (hover: hover) {
  .btn:hover { transform: translateY(-1px); opacity: 0.9; }
}

.hero-side {
  grid-column: span 5;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  animation: softFadeUp 0.55s ease 0.08s both;
}

.video-card {
  grid-column: span 2;
  min-height: 330px;
  background: #000;
}

.video-card video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  opacity: 0.92;
}

/* Явно фиксируем поведение видео в нативном полноэкранном режиме:
   без обрезания, с чёрными полями у нестандартных пропорций (важно для вертикальных роликов) */
.video-card video:fullscreen,
.video-card video:-webkit-full-screen,
.video-card video:-moz-full-screen,
.hero-inline-video .hero-video:fullscreen,
.hero-inline-video .hero-video:-webkit-full-screen,
.hero-inline-video .hero-video:-moz-full-screen {
  position: static !important;
  width: 100% !important;
  height: 100% !important;
  object-fit: contain !important;
  background: #000 !important;
}

.mini {
  min-height: 210px;
  padding: 28px;
}

.hero-side .mini { padding: 24px 22px; }

.metric {
  margin-bottom: 12px;
  font-size: 46px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.06em;
}

.metric small {
  font-size: 18px;
  color: var(--muted);
  letter-spacing: -0.02em;
}

.dark .metric small { color: rgba(255,255,255,0.58); }

.hero-side .mini.dark .metric {
  white-space: nowrap;
  font-size: clamp(25px, 2.7vw, 38px);
  letter-spacing: -0.035em;
  color: var(--accent);
}

.hero-side .mini.dark .metric small {
  display: inline-block;
  margin-left: 4px;
  font-size: 13px;
  letter-spacing: normal;
  vertical-align: baseline;
}

.hero-side .mini.steel .metric {
  font-size: clamp(38px, 3vw, 44px);
  color: var(--dark);
}

.compare-card {
  grid-column: span 6;
  min-height: 430px;
  padding: 34px;
  border-width: 1px;
  border-color: rgba(16,24,27,0.14);
  box-shadow: 0 26px 70px rgba(16,24,27,0.16);
}

.compare-card.dark {
  box-shadow: var(--shadow);
}

.method-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.tag {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(23,33,36,0.06);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.dark .tag {
  background: rgba(245,200,0,0.14);
  color: var(--accent);
}

.layers {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.layer {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px;
  border-radius: 20px;
  background: rgba(255,255,255,0.9);
  border: 1px solid rgba(16,24,27,0.18);
}

.dark .layer {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.16);
}

.layer strong {
  display: block;
  margin-bottom: 6px;
}

.layer p { font-size: 14px; }

.layer-icon {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-weight: 800;
  font-size: 15px;
  line-height: 1;
}

.layer-icon.bad {
  background: rgba(196,60,50,0.12);
  color: #c0392b;
}

.layer-icon.good {
  background: rgba(245,200,0,0.16);
  color: var(--accent);
}

.features .card { min-height: 260px; padding: 28px; }
.feature-large  { grid-column: span 6; }
.feature-mid    { grid-column: span 3; }
.feature-wide   { grid-column: span 6; }
.features .card h3 { margin-bottom: 14px;}
.icon {
  width: 46px;
  height: 46px;
  margin-bottom: 22px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: var(--accent);
  color: var(--black);
  font-weight: 700;
}

.schema-card {
  grid-column: span 12;
  padding: 42px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.schema-head { max-width: 640px; }

.schema-visual {
  border-radius: 20px;
  overflow: hidden;
  background: #10181b;
  border: 1px solid rgba(255,255,255,0.1);
}

.schema-visual svg {
  display: block;
  width: 100%;
  height: auto;
}

.schema-legend {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.schema-legend .layer {
  height: 100%;
  align-items: flex-start;
}

.schema-legend .icon {
  width: 34px;
  height: 34px;
  margin-bottom: 0;
  flex-shrink: 0;
  border-radius: 10px;
  font-size: 13px;
}

.tech {
  grid-column: span 12;
  padding: 34px;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.tech-item {
  padding: 22px;
  border-radius: 22px;
  background: rgba(255,255,255,0.9);
  border: 1px solid rgba(16,24,27,0.18);
}

.tech-item h3 {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 10px;
  background: rgba(245,200,0,0.16);
  color: var(--dark);
  font-size: clamp(21px, 2.1vw, 27px);
  letter-spacing: -0.02em;
}
.tech-item span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

.steps {
  grid-column: span 12;
  padding: 34px;
}

.apply-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.apply-photo {
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(16,24,27,.12);
  background: #e7ebec;
  box-shadow: 0 10px 24px rgba(12,18,20,.1);
  transition: transform .2s ease, box-shadow .2s ease;
  cursor: zoom-in;
}

.apply-photo.is-no-preview { cursor: default; }

.apply-photo img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  min-height: 0;
  max-height: none;
  padding: 0;
  object-fit: cover;
  object-position: center;
  display: block;
  background: #dfe5e6;
}

/* Вертикальный кадр с трубой: сохраняем важную верхнюю часть снимка. */
.apply-photo:nth-child(3) img { object-position: center 28%; }

/* Техническая схема: сохраняем полный кадр, а не обрезаем его. */
.apply-photo-scheme img {
  padding: 12px;
  object-fit: contain;
  background: #eef1f2;
}

@media (hover: hover) {
  .apply-photo:hover { transform: translateY(-3px); box-shadow: 0 16px 30px rgba(12,18,20,.14); }
}

.apply-photo-tag {
  display: block;
  min-height: 58px;
  padding: 13px 16px 15px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
  background: #fff;
}

.project-photo-viewer-open { overflow: hidden; }
.project-photo-viewer { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 24px; opacity: 0; visibility: hidden; pointer-events: none; transition: opacity .2s ease, visibility 0s linear .2s; }
.project-photo-viewer.is-open { opacity: 1; visibility: visible; pointer-events: auto; transition-delay: 0s; }
.project-photo-viewer-backdrop { position: absolute; inset: 0; background: rgba(8,14,16,.86); backdrop-filter: blur(5px); }
.project-photo-viewer-dialog { position: relative; display: grid; grid-template-rows: minmax(0, 1fr) auto; width: min(1080px, 100%); max-height: min(820px, calc(100vh - 48px)); overflow: hidden; border: 1px solid rgba(255,255,255,.16); border-radius: 18px; background: #172124; box-shadow: 0 24px 70px rgba(0,0,0,.42); }
.project-photo-viewer-image { display: block; justify-self: center; width: auto; height: auto; max-width: 100%; max-height: calc(100vh - 150px); object-fit: contain; background: #10191b; }
.project-photo-viewer-caption { padding: 15px 58px 16px 18px; color: #fff; font-size: 14px; line-height: 1.4; }
.project-photo-viewer-close, .project-photo-viewer-nav { position: absolute; z-index: 1; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; background: rgba(18,29,32,.8); color: #fff; cursor: pointer; }
.project-photo-viewer-close { top: 12px; right: 12px; width: 38px; height: 38px; font-size: 25px; }
.project-photo-viewer-nav { top: 50%; width: 44px; height: 44px; font-size: 32px; transform: translateY(-50%); }
.project-photo-viewer-prev { left: 14px; }.project-photo-viewer-next { right: 14px; }
.project-photo-viewer-close:hover, .project-photo-viewer-nav:hover { border-color: var(--accent); color: var(--accent); }

@media (max-width: 620px) {
  .apply-photo-tag { min-height: 52px; padding: 12px 14px; }
  .project-photo-viewer { padding: 10px; }
  .project-photo-viewer-dialog { max-height: calc(100vh - 20px); border-radius: 14px; }
  .project-photo-viewer-image { max-height: calc(100vh - 112px); }
  .project-photo-viewer-nav { width: 38px; height: 38px; font-size: 28px; }
  .project-photo-viewer-prev { left: 8px; }.project-photo-viewer-next { right: 8px; }
}

.step-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.step {
  padding: 22px;
  border-radius: 22px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.16);
}

.step-num {
  margin-bottom: 16px;
  color: var(--accent);
  font-weight: 700;
}

.step p { font-size: 15px; }
.step h3 { font-size: 23px; margin-bottom: 13px; }

.contact-form-section {
  margin: 54px 0 34px;
  padding: 42px;
  border-color: rgba(245,200,0,0.3);
  box-shadow: var(--shadow), 0 0 0 1px rgba(245,200,0,0.12) inset;
}

.contact-form-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: center;
}

.contact-form-info h2 { max-width: 620px; }

.direct-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.phone-link,
.messenger-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  font-weight: 700;
  border: 1px solid rgba(255,255,255,0.14);
}

.phone-link    { background: rgba(255,255,255,0.08); color: #fff; }
.messenger-link { background: var(--accent); color: var(--black); }

.form-container {
  padding: 28px;
  border-radius: 24px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
}

.input-group { margin-bottom: 16px; }

.input-group label {
  display: block;
  margin-bottom: 8px;
  color: rgba(255,255,255,0.64);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.input-group input,
.input-group select {
  width: 100%;
  height: 56px;
  padding: 0 16px;
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: 16px;
  background: rgba(255,255,255,0.11);
  color: #fff;
  font-size: 16px;
  outline: none;
}

.input-group input::placeholder { color: rgba(255,255,255,0.38); }
.input-group select { appearance: none; color: rgba(255,255,255,0.9); }
.input-group select option { color: var(--text); background: #fff; }

.input-group input:focus,
.input-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(245,200,0,0.16);
}

.consent-group {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 18px;
  cursor: pointer;
}

.consent-group input {
  margin-top: 3px;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  accent-color: var(--accent);
}

.consent-group span {
  color: rgba(255,255,255,0.6);
  font-size: 13px;
  line-height: 1.4;
}

.form-success-message,
.form-error-message {
  margin-bottom: 16px;
  padding: 14px 16px;
  border-radius: 14px;
  font-size: 14px;
  font-weight: 700;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.form-success-message.show,
.form-error-message.show { opacity: 1; transform: translateY(0); }

.form-success-message {
  background: rgba(39,174,96,0.14);
  color: #b9f6d0;
  border: 1px solid rgba(39,174,96,0.35);
}

.form-error-message {
  background: rgba(231,76,60,0.14);
  color: #ffd0ca;
  border: 1px solid rgba(231,76,60,0.35);
}

.footer {
  padding: 54px 0 44px;
  color: var(--muted);
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.3fr;
  gap: 20px;
}

.footer-card {
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-card h3 {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
}

.footer-line {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: rgba(255,255,255,0.78);
  font-size: 14px;
  line-height: 1.4;
}

.footer-line svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--accent);
  margin-top: 1px;
}

@media (hover: hover) {
  .footer-line:hover { color: #fff; }
}

.footer-social-icons {
  display: flex;
  gap: 12px;
}

.social-btn {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  color: #fff;
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.social-btn svg {
  width: 22px;
  height: 22px;
}

@media (hover: hover) {
  .social-btn:hover {
    background: var(--accent);
    border-color: transparent;
    color: var(--black);
    transform: translateY(-2px);
  }
}

.footer-map-card {
  padding: 0;
}

.footer-map {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
}

.footer-map iframe {
  width: 100%;
  height: 100%;
  display: block;
  border: 0;
  filter: grayscale(0.6) contrast(1.05) brightness(0.92);
  opacity: 0.95;
}

.footer-map-open {
  position: absolute;
  right: 14px;
  top: 14px;
  z-index: 2;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(18,29,32,0.88);
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  backdrop-filter: blur(2px);
  transition: background 0.18s ease;
}

@media (hover: hover) {
  .footer-map-open:hover {
    background: var(--accent);
    color: var(--black);
  }
}

.footer-bottom {
  padding: 28px 4px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--muted);
}

.footer-bottom .footer-logo {
  display: inline-flex;
  padding: 7px 9px;
  border-radius: 999px;
  background: rgba(255,255,255,0.92);
}

.footer-bottom .footer-logo img {
  width: 96px;
  height: auto;
  display: block;
}

@keyframes softFadeUp {
  from { opacity: 0; transform: translate3d(0, 14px, 0); }
  to   { opacity: 1; transform: translate3d(0, 0, 0); }
}

.reveal {
  opacity: 0;
  transform: translate3d(0, 16px, 0);
  transition: opacity 0.6s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.line-scheme-steps .line-scheme-step {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.line-scheme.is-visible .line-scheme-step { opacity: 1; transform: translateY(0); }
.line-scheme.is-visible .line-scheme-step:nth-child(2) { transition-delay: 0.08s; }
.line-scheme.is-visible .line-scheme-step:nth-child(3) { transition-delay: 0.16s; }
.line-scheme.is-visible .line-scheme-step:nth-child(4) { transition-delay: 0.24s; }

.hero-main::after,
.compare-card::after,
.feature-large::after,
.feature-wide::after,
.tech::after,
.contact-form-section::after {
  content: "";
  position: absolute;
  pointer-events: none;
  z-index: 0;
}

.hero-main::after {
  width: 220px;
  height: 22px;
  right: -70px;
  bottom: 95px;
  background: rgba(245,200,0,0.12);
  transform: rotate(-28deg);
  border-radius: 999px;
}

.compare-card::after {
  width: 120px;
  height: 120px;
  right: -34px;
  top: 42px;
  border: 18px solid rgba(23,33,36,0.045);
  border-radius: 50%;
}

.compare-card.dark::after { border-color: rgba(245,200,0,0.11); }

.feature-large::after {
  width: 110px;
  height: 110px;
  right: 26px;
  bottom: 24px;
  border: 1px solid rgba(245,200,0,0.18);
  border-radius: 24px;
  transform: rotate(14deg);
}

.feature-wide::after {
  width: 120px;
  height: 80px;
  right: 28px;
  top: 26px;
  background-image: radial-gradient(rgba(23,33,36,0.16) 1.2px, transparent 1.2px);
  background-size: 14px 14px;
  opacity: 0.45;
}

.feature-wide.dark::after {
  background-image: radial-gradient(rgba(245,200,0,0.28) 1.2px, transparent 1.2px);
  opacity: 0.38;
}

.tech::after {
  width: 130px;
  height: 130px;
  right: 34px;
  top: 34px;
  background: rgba(245,200,0,0.12);
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
  transform: rotate(12deg);
}

.contact-form-section::after {
  width: 160px;
  height: 160px;
  left: -48px;
  bottom: -48px;
  border: 1px solid rgba(245,200,0,0.18);
  border-radius: 50%;
}

@media (max-width: 980px) {
  .home-page .hero-main {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    min-height: auto;
  }

  .home-page .hero-copy-content { grid-row: auto; }
  .home-page .hero-inline-video { min-height: 260px; }
  .home-page .hero-bottom {
    grid-column: auto;
    grid-row: auto;
    align-self: stretch;
  }

  .nav { gap: 12px; }
  .nav-contacts { margin-left: 0; }
  .nav-icon-btn { display: none; }
  .nav-links   { display: none; }

  .hero-main,
  .product-hero,
  .hero-side,
  .compare-card,
  .steps { grid-column: span 12; }

  .apply-gallery { grid-template-columns: repeat(2, 1fr); }
  .apply-photo:last-child { grid-column: span 2; }
  .apply-photo img { max-height: 260px; min-height: 0; }

  /* Pair up feature cards two-per-row instead of stacking all 5 full-width,
     which cuts the section height roughly in half. */
  .features { grid-template-columns: repeat(2, 1fr); }
  .feature-large { grid-column: span 2; }
  .feature-mid,
  .feature-wide { grid-column: span 1; }

  .tech-grid,
  .step-list { grid-template-columns: repeat(2, 1fr); }

  .schema-legend { grid-template-columns: 1fr; }

  .contact-form-grid { grid-template-columns: 1fr; }
  .audience-grid { grid-template-columns: 1fr; }
}

/* Compact mobile layout: tighter spacing/type scale everywhere
   to cut total page height and minimize scrolling. */
@media (max-width: 620px) {
  .page { width: min(100% - 20px, 1220px); }

  .bento { gap: 10px; }

  .apply-gallery {
    display: flex;
    grid-template-columns: none;
    gap: 10px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
    margin-top: 12px;
  }
  .apply-photo {
    flex: 0 0 88%;
    scroll-snap-align: start;
  }
  .apply-photo:last-child { grid-column: auto; }

  .hero    { padding: 12px 0 8px; }
  .section { padding: 18px 0 4px; }

  .nav {
    top: max(8px, env(safe-area-inset-top));
    margin-top: max(10px, env(safe-area-inset-top));
    padding: 8px;
    border-radius: 20px;
  }
  .logo     { min-width: auto; }
  .logo img { height: 26px; }
  .nav-contacts { gap: 6px; }

  .nav-phone,
  .nav-request {
    min-height: 36px;
    padding: 0 10px;
    font-size: 12px;
  }

  .nav-phone { display: none; }

  h1 { font-size: clamp(28px, 7.5vw, 36px); line-height: 1.02; letter-spacing: -0.02em; }
  h2 { font-size: clamp(22px, 5.8vw, 28px); letter-spacing: -0.015em; }
  h3 { font-size: 18px; letter-spacing: normal; }
  p  { font-size: 14px; line-height: 1.45; }

  .eyebrow { margin-bottom: 12px; padding: 6px 10px; font-size: 13px; }

  .hero-main,
  .mini,
  .compare-card,
  .features .card,
  .tech,
  .steps {
    padding: 16px;
    border-radius: 18px;
  }

  .hero-main { min-height: auto; }
  .home-page .hero-main { display: flex; flex-direction: column; gap: 16px; }
  .home-page .hero-inline-video,
  .home-page .hero-inline-video .hero-video { min-height: 190px; }
  .home-page .hero-stats-row { gap: 8px; }
  .home-page .hero-stats-row .mini { min-height: 0; }
  .hero-text { margin-top: 10px; font-size: 14px; }
  .hero-actions { margin-top: 14px; gap: 8px; }
  .hero-bottom .hero-actions { margin-top: 12px; }

  .btn { min-height: 42px; padding: 0 14px; font-size: 13px; }

  .hero-side { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .video-card,
  .video-card video { min-height: 135px; }
  .mini { min-height: auto; padding: 14px; }
  .hero-side .mini { padding: 12px 14px; }
  .metric { margin-bottom: 4px; font-size: 26px; }
  .hero-side .mini.dark .metric,
  .hero-side .mini.steel .metric { font-size: 22px; }
  .mini p { font-size: 12px; line-height: 1.3; }

  .section-head { display: block; margin-bottom: 8px; }
  .section-head p { margin-top: 6px; }

  .product-lines,
  .case-grid,
  .scheme-grid,
  #features .bento {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding: 2px 0 6px;
    scrollbar-width: none;
  }

  .product-lines::-webkit-scrollbar,
  .case-grid::-webkit-scrollbar,
  .scheme-grid::-webkit-scrollbar,
  #features .bento::-webkit-scrollbar { display: none; }

  .product-line-card,
  .case-card,
  .scheme-card,
  #features .bento > .card {
    flex: 0 0 88%;
    scroll-snap-align: start;
  }

  .guide-dark {
    background: #172124 !important;
    background-image:
      linear-gradient(rgba(23, 33, 36, 0.82), rgba(23, 33, 36, 0.82)),
      url("img/beton-bg.webp") !important;
    color: #fff !important;
  }

  .guide-dark p,
  .guide-dark h3 { color: #fff !important; }

  .features { gap: 8px; }
  .features .card { min-height: auto; padding: 14px; }
  .features .card h3 { margin-bottom: 6px; font-size: 15px; line-height: 1.2; }
  .features .card p { font-size: 12px; line-height: 1.35; }
  .icon { width: 30px; height: 30px; margin-bottom: 8px; border-radius: 9px; font-size: 12px; }

  .schema-card { padding: 12px; gap: 10px; border-radius: 16px; }
  .schema-visual { border-radius: 14px; }
  .schema-legend { gap: 8px; }
  .schema-legend .layer { padding: 10px 12px; gap: 10px; border-radius: 14px; }
  .schema-legend .icon { width: 26px; height: 26px; font-size: 11px; border-radius: 8px; }

  .compare-card { min-height: auto; padding: 12px; }
  .method-title { margin-bottom: 10px; }
  .layers { gap: 6px; margin-top: 12px; }
  .layer { padding: 8px 10px; gap: 10px; border-radius: 14px; }
  .layer strong { margin-bottom: 2px; font-size: 13.5px; }
  .layer p { font-size: 12px; line-height: 1.3; }
  .layer-icon { width: 24px; height: 24px; font-size: 13px; }

  /* Swipeable carousel: show one comparison card at a time instead of
     stacking both full-height cards, cutting the section's scroll height
     roughly in half. A sliver of the next card peeks in to hint at swiping. */
  #compare .bento {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
    scroll-padding-left: 0;
  }
  #compare .compare-card {
    flex: 0 0 92%;
    scroll-snap-align: start;
  }

  .swipe-hint {
    display: inline-block;
    margin-top: 6px;
    color: var(--muted);
    font-size: 12px;
  }

  .tech-grid,
  .step-list { grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: 14px; }
  .tech-item,
  .step { padding: 12px; border-radius: 14px; }
  .tech-item h3 { font-size: 16px; }
  .tech-item span { margin-top: 4px; font-size: 12px; }
  .step-num { margin-bottom: 6px; font-size: 13px; }
  .step p { font-size: 12px; }

  .contact-form-section {
    margin: 16px 0 14px;
    padding: 12px;
    border-radius: 18px;
  }

  .contact-form-info h2 { max-width: none; }
  .direct-contact { margin-top: 12px; gap: 8px; }
  .phone-link,
  .messenger-link { min-height: 40px; padding: 0 14px; font-size: 13px; }

  .form-container {
    margin-top: 10px;
    padding: 12px;
    border-radius: 16px;
  }

  .input-group { margin-bottom: 10px; }
  .input-group input,
  .input-group select { height: 44px; font-size: 14px; }
  .consent-group { margin-bottom: 10px; }
  .btn-full { min-height: 44px; }

  .footer { padding: 18px 0 18px; }

  .footer-grid { grid-template-columns: 1fr; gap: 10px; }

  .footer-card { padding: 16px; border-radius: 16px; gap: 8px; }
  .footer-card h3 { font-size: 15px; }
  .footer-line { font-size: 13px; }

  .footer-map { min-height: 130px; }

  .footer-bottom {
    padding-top: 14px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    font-size: 12px;
  }

  .hero-main::after,
  .compare-card::after,
  .feature-large::after,
  .feature-wide::after,
  .tech::after,
  .contact-form-section::after {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }

  .reveal { opacity: 1; transform: none; }
}

/* ===== iPad / Safari hard flicker fix ===== */
@media (hover: none), (pointer: coarse), (max-width: 1024px) {
  html {
    scroll-behavior: auto !important;
  }



  .card,
  .hero-main,
  .hero-side,
  .dark,
  .steel,
  .contact-form-section,
  .footer-card,
  .footer-map-card {
    transform: none !important;
    -webkit-transform: none !important;
    -webkit-backface-visibility: visible !important;
    backface-visibility: visible !important;
    isolation: auto !important;
  }

  .dark,
  .hero-main,
  .contact-form-section,
  .footer-card {
    background: #172124 !important;
    color: #fff !important;
  }

  .steel {
    background: #b9cad0 !important;
    color: #10181b !important;
  }

  .footer-map iframe {
    display: none !important;
    filter: none !important;
    opacity: 1 !important;
  }

  .footer-map {
    min-height: 130px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    background: #172124 !important;
  }

  .footer-map-open {
    position: static !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    min-height: 44px !important;
    padding: 0 18px !important;
    background: #f5c800 !important;
    color: #111 !important;
    border: none !important;
    border-radius: 999px !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }
}

/* Безопасная текстура карточек для iPad */
@media (hover: none), (pointer: coarse), (max-width: 1024px) {
  .dark,
  .hero-main,
  .contact-form-section,
  .footer-card {
    background-color: #172124 !important;
    background-image:
      linear-gradient(rgba(23, 33, 36, 0.82), rgba(23, 33, 36, 0.82)),
      url("img/beton-bg.webp") !important;
    background-size: cover !important;
    background-position: center !important;
  }

  .steel {
    background-color: #b9cad0 !important;
    background-image:
      linear-gradient(rgba(185, 202, 208, 0.68), rgba(185, 202, 208, 0.68)),
      url("img/betonfon-bg.webp") !important;
    background-size: cover !important;
    background-position: center !important;
  }

  .card:not(.dark):not(.steel):not(.hero-main):not(.contact-form-section):not(.footer-card) {
    background-color: rgba(255, 255, 255, 0.94) !important;
    background-image:
      linear-gradient(rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.88)),
      url("img/betonfon.webp") !important;
    background-size: 520px 520px !important;
    background-position: center !important;
  }

  .dark::before,
  .hero-main::before,
  .steel::before,
  .contact-form-section::before,
  .footer-card::before {
    content: none !important;
    display: none !important;
  }
}
/* =====================================================================
   Новые компоненты для мультипродуктового сайта formulabetona.kz
   (карточки линеек, аккордеон марок, тизер Бетоноправа, чипы)
   ===================================================================== */

/* --- Активный пункт навигации --- */
.nav-links a.active {
  color: var(--accent);
}

/* --- Строка бренд-статистики на главной --- */
.brand-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.brand-stat {
  padding: 18px;
  border-radius: 20px;
}

.brand-stat .metric { font-size: 30px; margin-bottom: 4px; }
.brand-stat p { font-size: 14px; }

/* --- Карточки линеек продуктов (Дегидрол / Бетоноправ / Контацид) --- */
.product-lines {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.product-line-card {
  padding: 34px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 320px;
}

.product-line-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: var(--line-accent, var(--accent));
}

.product-line-degidrol { --line-accent: #4d9eb8; }
.product-line-betonoprav { --line-accent: #d79b27; }
.product-line-kontatsid { --line-accent: #e2c000; }
.product-line-degidrol .product-line-badge { color: #a9e0ee; background: rgba(77,158,184,0.18); }
.product-line-betonoprav .product-line-badge { color: #936100; background: rgba(215,155,39,0.18); }
.product-line-kontatsid .product-line-badge { color: var(--accent); background: rgba(245,200,0,0.16); }

.product-line-photo-degidrol::before,
.product-line-photo-betonoprav::before,
.product-line-photo-kontatsid::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-position: center;
  background-size: cover;
  opacity: 0.42;
  pointer-events: none;
}

.product-line-photo-degidrol::before {
  background-image: linear-gradient(rgba(23,33,36,0.58), rgba(23,33,36,0.58)), url("img/5244646202681272893.webp");
}

.product-line-photo-betonoprav::before {
  background-image: linear-gradient(rgba(255,255,255,0.48), rgba(255,255,255,0.48)), url("img/q.webp");
}

.product-line-photo-kontatsid::before {
  background-image: linear-gradient(rgba(23,33,36,0.58), rgba(23,33,36,0.58)), url("img/5244646202681272888.webp");
}

@media (hover: none), (pointer: coarse), (max-width: 1024px) {
  .product-line-photo-degidrol::before,
  .product-line-photo-betonoprav::before,
  .product-line-photo-kontatsid::before {
    content: "" !important;
    display: block !important;
    opacity: 0.3 !important;
  }
}

.product-line-badge {
  display: inline-flex;
  width: fit-content;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  background: rgba(245,200,0,0.16);
  color: var(--black);
}

.dark .product-line-badge {
  background: rgba(245,200,0,0.16);
  color: var(--accent);
}

.product-line-card h3 { font-size: 26px; }

.product-line-card .marks-count {
  margin-top: auto;
  padding-top: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  border-top: 1px solid rgba(16,24,27,0.1);
}

.dark .product-line-card .marks-count {
  color: rgba(255,255,255,0.6);
  border-top-color: rgba(255,255,255,0.14);
}

.product-line-card .btn { margin-top: 6px; align-self: flex-start; }

/* --- Тизер-баннер Бетоноправа со ссылкой на betonoprav.kz --- */
.external-cta-card {
  grid-column: span 12;
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.external-cta-text { max-width: 640px; }
.external-cta-text h2 { font-size: clamp(26px, 3.4vw, 38px); }
.external-cta-text p { margin-top: 10px; }

.external-cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-icon-right svg {
  width: 16px;
  height: 16px;
  margin-left: 8px;
  flex-shrink: 0;
}

/* --- Заголовок раздела продукта (страницы Дегидрол/Бетоноправ/Контацид) --- */
.product-hero {
  grid-column: span 7;
  align-self: start;
  padding: 44px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.product-hero-degidrol { --product-accent: #63b8cf; }
.product-hero-betonoprav { --product-accent: #e0a331; }
.product-hero-kontatsid { --product-accent: #f5c800; }

.product-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-position: center;
  background-size: cover;
  opacity: 1;
  pointer-events: none;
}

.product-hero-degidrol::before {
  background-image: linear-gradient(90deg, rgba(23,33,36,0.9), rgba(23,33,36,0.58)), url("img/degstena.webp");
}

.product-hero-betonoprav::before {
  background-image: linear-gradient(90deg, rgba(23,33,36,0.9), rgba(23,33,36,0.58)), url("img/t.webp");
}

.product-hero-kontatsid::before {
  background-image: linear-gradient(90deg, rgba(23,33,36,0.9), rgba(23,33,36,0.58)), url("img/5244646202681272888.webp");
}

.product-hero::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 8px;
  height: 100%;
  background: var(--product-accent, var(--accent));
}

.product-hero .eyebrow {
  background: color-mix(in srgb, var(--product-accent, var(--accent)) 18%, transparent);
  color: var(--product-accent, var(--accent));
}

.product-hero .product-tag {
  border-color: color-mix(in srgb, var(--product-accent, var(--accent)) 35%, transparent);
}

.product-hero .hero-text { max-width: 760px; }

.product-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.product-tag {
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.16);
}

/* Единая техническая схема для страниц продуктовых линеек. */
.line-scheme {
  padding: clamp(24px, 4vw, 42px);
  border-top: 4px solid var(--scheme-accent, var(--accent));
  box-shadow: none;
}

.line-scheme-head {
  max-width: 680px;
}

.line-scheme-head h2 {
  margin-top: 10px;
  font-size: clamp(28px, 4vw, 48px);
}

.line-scheme-head p {
  margin-top: 12px;
  max-width: 620px;
}

.line-scheme-steps {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 30px;
}

.line-scheme-steps::before {
  content: "";
  position: absolute;
  left: 10%;
  right: 10%;
  top: 25px;
  border-top: 1px solid color-mix(in srgb, var(--scheme-accent, var(--accent)) 50%, transparent);
}

.line-scheme-step {
  position: relative;
  z-index: 1;
  padding: 18px;
  background: rgba(255,255,255,0.78);
  border: 1px solid rgba(16,24,27,0.12);
  border-radius: 12px;
}

.line-scheme-step-number {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--scheme-accent, var(--accent));
  color: var(--black);
  font-size: 13px;
  font-weight: 800;
}

.line-scheme-step h3 {
  margin-top: 18px;
  font-size: 19px;
}

.line-scheme-step p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.45;
}

.line-scheme-degidrol { --scheme-accent: #63b8cf; }
.line-scheme-betonoprav { --scheme-accent: #e0a331; }
.line-scheme-kontatsid { --scheme-accent: #f5c800; }

@media (max-width: 620px) {
  .line-scheme { padding: 20px 16px; }
  .line-scheme-steps {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 20px;
  }
  .line-scheme-steps::before { display: none; }
  .line-scheme-step { padding: 14px; }
  .line-scheme-step h3 { margin-top: 12px; font-size: 16px; }
  .line-scheme-step p { font-size: 12px; }
}

/* --- Аккордеон-карточки марок --- */
.marks-grid {
  grid-column: span 12;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 14px;
}

.mark-card {
  padding: 0;
  align-self: start;
  overflow: visible;
  transform: translateY(0);
  transition: transform 0.29s cubic-bezier(0.22, 0.61, 0.36, 1), box-shadow 0.29s ease, border-color 0.29s ease;
}

.mark-backdrop {
  position: fixed;
  inset: 0;
  z-index: 4;
  background: rgba(16,24,27,0.16);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .22s ease, visibility 0s linear .22s;
}

body.mark-modal-open { overflow: hidden; }
body.mark-modal-open .mark-backdrop {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition-delay: 0s;
}

body.mark-modal-open .nav { z-index: 3; }

.mark-card.open {
  position: fixed;
  top: 8vh;
  left: 50%;
  width: min(1040px, calc(100vw - 48px));
  z-index: 5;
  border-color: rgba(245,200,0,0.62);
  transform: translateX(-50%);
  box-shadow: 0 16px 30px rgba(16,24,27,0.15), 0 0 0 2px rgba(245,200,0,0.1);
}

.mark-card.open .mark-body {
  left: 0;
  right: auto;
  width: 100%;
  max-height: calc(84vh - 100px);
  overscroll-behavior: contain;
}

.mark-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 26px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}

.mark-badge {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 96px;
  padding: 9px 14px;
  border-radius: 12px;
  background: var(--dark);
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  white-space: nowrap;
}

.mark-toggle-text {
  flex: 1;
  min-width: 0;
}

.mark-toggle-text .mark-name {
  display: block;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.mark-toggle-text .mark-tagline {
  display: block;
  margin-top: 3px;
  font-size: 14px;
  color: var(--muted);
}

.mark-chevron {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(16,24,27,0.06);
  font-size: 20px;
  font-weight: 700;
  transition: transform 0.21s ease, background 0.18s ease;
}

.mark-card:not(.open) .mark-chevron {
  animation: markHint 2.8s ease-in-out infinite;
}

.mark-toggle:hover .mark-chevron,
.mark-toggle:focus-visible .mark-chevron {
  animation: none;
  background: var(--accent);
}

@keyframes markHint {
  0%, 72%, 100% { transform: scale(1); }
  78% { transform: scale(1.14); }
  84% { transform: scale(1); }
}

.mark-card.open .mark-chevron {
  transform: rotate(45deg);
  background: var(--accent);
}

.mark-body {
  position: absolute;
  z-index: 3;
  top: calc(100% + 10px);
  left: 0;
  width: calc(200% + 14px);
  max-height: min(62vh, 640px);
  overflow: auto;
  border: 1px solid rgba(245,200,0,0.38);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.98);
  box-shadow: 0 20px 36px rgba(16,24,27,0.18);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity .18s ease, transform .24s ease, visibility 0s linear .24s;
}

.mark-card.wide-right .mark-body {
  left: auto;
  right: 0;
}

.mark-card.open .mark-body {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
  transition-delay: 0s;
}


.mark-body-inner {
  overflow: visible;
}


.mark-collapse {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin: 0 26px 24px;
  padding: 8px 12px;
  border: 1px solid rgba(16,24,27,0.14);
  border-radius: 999px;
  background: rgba(16,24,27,0.05);
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.mark-collapse:hover,
.mark-collapse:focus-visible {
  background: var(--accent);
  color: var(--black);
  transform: translateY(-1px);
  outline: none;
}

.mark-content {
  padding: 0 26px 28px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  border-top: 1px solid rgba(16,24,27,0.08);
  padding-top: 22px;
  margin: 0 26px;
}

.mark-card.open .mark-toggle {
  border-radius: var(--radius);
}

@media (max-width: 620px) {
  .mark-card.open {
    top: 10vh;
    left: 12px;
    right: 12px;
    width: auto;
    transform: none;
  }

  .mark-body,
  .mark-card.wide-right .mark-body {
    left: 0;
    right: auto;
    width: 100%;
  }

  .mark-card.open .mark-body {
    max-height: calc(84vh - 90px);
  }
}

@media (max-width: 980px) and (min-width: 621px) {
  .mark-card.open {
    top: 8vh;
    left: 20px;
    right: 20px;
    width: auto;
    transform: none;
  }

  .mark-card.open .mark-body {
    max-height: calc(84vh - 100px);
  }
}

@media (max-width: 1180px) and (min-width: 981px) {
  .mark-card.open {
    top: 8vh;
    left: 24px;
    right: 24px;
    width: auto;
    transform: none;
  }

  .mark-card.open .mark-body {
    max-height: calc(84vh - 100px);
  }
}

.mark-content .mark-meta-row,
.mark-content .mark-explainer,
.mark-content .mark-application,
.mark-content .mark-media { grid-column: 1 / -1; }

.mark-media {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding-top: 2px;
}

.mark-media-item {
  min-width: 0;
  overflow: hidden;
  border-radius: 12px;
  background: #fff;
  border: 1px solid rgba(16,24,27,0.1);
  box-shadow: 0 6px 16px rgba(12,18,20,.06);
}

.mark-media-frame {
  aspect-ratio: 16 / 10;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: #eef1f2;
}

.mark-media-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.mark-media-scheme .mark-media-frame { padding: 8px; }
.mark-media-scheme img { object-fit: contain; }
.mark-media-packaging { max-width: 210px; overflow: visible; border: 0; background: transparent; box-shadow: none; }
.mark-media-packaging .mark-media-frame { aspect-ratio: auto; padding: 0; overflow: visible; background: transparent; }
.mark-media-packaging img { width: 100%; height: auto; max-height: 230px; object-fit: contain; }
.mark-media-packaging figcaption { padding: 8px 0 0; }
.mark-media-item figcaption { padding: 9px 11px; color: var(--muted); font-size: 12px; line-height: 1.35; }

.mark-application {
  padding: 16px 18px;
  border-radius: 14px;
  background: var(--dark);
  color: #fff;
}

.mark-application > span {
  display: block;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .07em;
  text-transform: uppercase;
}

.mark-application ol {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  list-style: none;
  counter-reset: mark-step;
  margin-top: 12px;
}

.mark-content .mark-application li { color: rgba(255,255,255,0.92) !important; font-size: 14px; font-weight: 700; line-height: 1.4; }
.mark-application li::before { counter-increment: mark-step; content: "0" counter(mark-step) " "; color: var(--accent); font-size: 12px; }

.mark-explainer {
  grid-column: span 2;
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  border-radius: 0 14px 14px 0;
  background: rgba(245,200,0,0.1);
}

.mark-explainer strong {
  display: block;
  color: var(--text);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mark-explainer p {
  margin-top: 6px;
  color: var(--text);
  font-size: 15px;
  line-height: 1.55;
}

.mark-instruction-link {
  grid-column: 1 / -1;
  width: fit-content;
  color: var(--dark);
  font-size: 13px;
  font-weight: 800;
  border-bottom: 1px solid rgba(16,24,27,0.24);
  transition: color .18s ease, border-color .18s ease;
}

.mark-instruction-link:hover,
.mark-instruction-link:focus-visible {
  color: #8d7300;
  border-color: var(--accent);
}

.instructions-main { padding: 72px 0 38px; }
.instructions-hero { position: relative; display: grid; grid-template-columns: 1fr; padding: clamp(26px, 4vw, 46px); overflow: hidden; border: 0; border-radius: var(--radius); color: #fff; background: linear-gradient(90deg, rgba(18,29,32,.93), rgba(18,29,32,.64)), url("img/degstena.webp") center / cover no-repeat; box-shadow: 0 12px 30px rgba(12,18,20,.15); }
.instructions-hero::before { content: ""; position: absolute; width: 270px; height: 270px; right: -135px; top: -150px; border: 42px solid rgba(245,200,0,.13); border-radius: 50%; pointer-events: none; }
.instructions-hero h1 { max-width: 730px; margin-top: 16px; font-size: clamp(42px, 5.6vw, 76px); }
.instructions-hero p { max-width: 650px; margin-top: 20px; color: rgba(255,255,255,.78); font-size: 18px; }
.instruction-line-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 30px; }
.instruction-line-nav a { min-width: 150px; padding: 11px 13px; display: flex; justify-content: space-between; align-items: center; border: 1px solid rgba(255,255,255,.2); border-radius: 9px; color: #fff; background: #243438; font-size: 13px; font-weight: 700; transition: background .2s ease, color .2s ease, transform .2s ease; }
.instruction-line-nav a span { color: var(--accent); font-size: 11px; letter-spacing: .08em; }
.instruction-line-nav a:hover { color: var(--black); background: var(--accent); border-color: var(--accent); transform: translateY(-2px); }
.instruction-line-nav a:hover span { color: inherit; }
.instruction-line { position: relative; padding: 58px 0 12px; scroll-margin-top: 98px; }
.instruction-line:not(:last-child)::after { content: ""; position: absolute; right: 0; bottom: -34px; left: 0; height: 1px; background: linear-gradient(90deg, rgba(16,24,27,.2), transparent); }
.instruction-line-head { display: flex; align-items: baseline; justify-content: center; gap: 12px; max-width: none; margin-bottom: 28px; text-align: center; }
.instruction-line-head h2 { margin: 0; font-size: clamp(24px, 2.6vw, 34px); line-height: 1.1; text-shadow: none; }
.instruction-line-head p { margin: 0; max-width: 620px; font-size: 15px; }
.instruction-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; align-items: start; }
.instruction-card { overflow: hidden; border-radius: 18px; background: rgba(255,255,255,.86); border: 1px solid rgba(16,24,27,.1); box-shadow: 0 12px 28px rgba(12,18,20,.08); transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
.instruction-card:not(.is-open):hover { transform: translateY(-4px); border-color: rgba(245,200,0,.85); box-shadow: 0 18px 34px rgba(12,18,20,.14); }
.instruction-card-toggle { width: 100%; min-height: 96px; padding: 21px 22px; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 14px; border: 0; background: transparent; color: var(--text); font: inherit; text-align: left; cursor: pointer; }
.instruction-card-badge { min-width: 96px; padding: 9px 14px; border-radius: 12px; background: var(--dark); color: var(--accent); font-size: 13px; font-weight: 800; text-align: center; white-space: nowrap; }
.instruction-card-title { min-width: 0; font-size: 19px; font-weight: 800; letter-spacing: -0.01em; }
.instruction-card-icon { flex-shrink: 0; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; background: rgba(16,24,27,0.06); font-size: 20px; font-weight: 700; transition: transform .21s ease, background .18s ease; }
.instruction-card:not(.is-open) .instruction-card-icon { animation: markHint 2.8s ease-in-out infinite; }
.instruction-card-toggle:hover .instruction-card-icon,
.instruction-card-toggle:focus-visible .instruction-card-icon { animation: none; background: var(--accent); }
.instruction-card.is-open .instruction-card-icon { transform: rotate(45deg); background: var(--accent); animation: none; }
.instruction-card-body { display: none; padding: 0 22px 22px; border-top: 1px solid rgba(16,24,27,0.08); }
.instruction-card.is-open .instruction-card-body { display: block; animation: instructionOpen .24s ease both; }
.instruction-card-summary { margin-top: 18px; font-size: 15px; line-height: 1.5; }
.instruction-card-system { display: grid; gap: 6px; margin-top: 18px; padding: 15px 16px; border-left: 4px solid var(--accent); background: rgba(245,200,0,0.14); }
.instruction-card-system strong { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--dark); }
.instruction-card-system span { font-size: 14px; line-height: 1.5; color: var(--text); }
.instruction-card-body ol { margin: 18px 0 0 20px; display: grid; gap: 10px; }
.instruction-card-body li { padding-left: 4px; font-size: 14px; line-height: 1.45; }
.instruction-card-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 18px; }
.instruction-card-facts > div { padding: 12px; border-radius: 12px; background: rgba(16,24,27,0.05); }
.instruction-card-facts strong { display: block; color: var(--dark); font-size: 11px; text-transform: uppercase; letter-spacing: .05em; }
.instruction-card-facts span { display: block; margin-top: 6px; color: var(--muted); font-size: 12px; line-height: 1.4; }
.instruction-card-note { margin-top: 18px; padding: 13px 15px; border-left: 3px solid var(--accent); background: rgba(245,200,0,0.12); font-size: 13px; line-height: 1.45; }
.instruction-card-note strong { display: block; margin-bottom: 4px; font-size: 11px; text-transform: uppercase; letter-spacing: .06em; }
.instruction-card-practical { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 18px; }
.instruction-card-practical > div { padding: 12px; border: 1px solid rgba(16,24,27,.1); border-radius: 12px; background: rgba(245,200,0,.08); }
.instruction-card-practical strong { display: block; color: var(--dark); font-size: 11px; text-transform: uppercase; letter-spacing: .05em; }
.instruction-card-practical span { display: block; margin-top: 6px; color: var(--muted); font-size: 12px; line-height: 1.4; }
.instruction-card-media { margin-top: 20px; }
.instruction-card-media h3 { margin-bottom: 10px; color: var(--dark); font-size: 14px; text-transform: uppercase; letter-spacing: .05em; }
.instruction-card-media-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.instruction-card-media-item { overflow: hidden; margin: 0; border: 1px solid rgba(16,24,27,.1); border-radius: 12px; background: #fff; box-shadow: 0 6px 16px rgba(12,18,20,.06); }
.instruction-card-media-item > div { display: grid; place-items: center; min-height: 150px; aspect-ratio: 4 / 3; padding: 8px; background: #eef1f2; }
.instruction-card-media-item img { display: block; width: 100%; height: 100%; object-fit: contain; }
.instruction-card-media-scheme > div { background: #f7f8f8; }
.instruction-card-media-item figcaption { padding: 8px 10px; color: var(--muted); font-size: 12px; line-height: 1.35; }
.instruction-card-body .btn { margin-top: 18px; }
@keyframes instructionOpen { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 700px) {
  .instructions-main { padding-top: 38px; }
  .instructions-hero { min-height: 0; padding: 28px 20px; grid-template-columns: 1fr; gap: 28px; border-radius: 20px; }
  .instructions-hero::before { width: 260px; height: 260px; right: -130px; bottom: -150px; }
  .instructions-hero h1 { font-size: 42px; }
  .instructions-hero p { font-size: 16px; }
  .instruction-line-nav { margin-top: 24px; }
  .instruction-line-nav a { min-width: 0; flex: 1 1 135px; }
  .instruction-line { padding-top: 54px; }
  .instruction-line-head { flex-direction: column; align-items: center; gap: 6px; margin-bottom: 21px; }
  .instruction-grid { grid-template-columns: 1fr; }
  .instruction-card-toggle { min-height: 76px; padding: 15px 14px; gap: 9px; }
  .instruction-card-badge { min-width: 60px; padding: 7px 6px; font-size: 10px; }
  .instruction-card-title { font-size: 15px; }
  .instruction-card-body { padding: 0 16px 18px; }
  .instruction-card-facts { grid-template-columns: 1fr; }
  .instruction-card-practical { grid-template-columns: 1fr; }
  .instruction-card-media-grid { grid-template-columns: 1fr; }
}

.mark-block h4 {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 8px;
}

.mark-block ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mark-block li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--text);
}

.mark-block li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.mark-block p {
  font-size: 14.5px;
  color: var(--text);
}

.mark-system-solution {
  margin-top: 18px;
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  background: rgba(245,200,0,0.14);
}

.mark-system-solution h4 { color: var(--dark); }

.mark-system-solution p + p { margin-top: 10px; }

.mark-reference {
  display: inline-flex;
  margin-top: 14px;
  color: #876f00;
  font-size: 13px;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: rgba(135,111,0,0.35);
  text-underline-offset: 3px;
}

.mark-reference:hover { color: var(--black); }

.mark-meta-row {
  grid-column: span 2;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: -4px;
}

.mark-meta-chip {
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(16,24,27,0.06);
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text);
}

.mark-card.stub .mark-badge {
  background: rgba(16,24,27,0.08);
  color: var(--muted);
}

.mark-card.stub .mark-toggle-text .mark-tagline {
  font-style: italic;
}

/* --- Небольшая заметка "фото скоро появятся" вместо реальных фото --- */
.media-placeholder {
  grid-column: span 12;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  font-size: 14px;
  color: var(--muted);
}

.media-placeholder svg { flex-shrink: 0; width: 22px; height: 22px; color: var(--accent); }

/* --- Усиленный контраст для карточек статистики, чтобы не сливались с фоном --- */
.brand-stat {
  border-left: 4px solid var(--accent);
  border-color: rgba(16,24,27,0.28);
  box-shadow: 0 24px 60px rgba(16,24,27,0.28);
}

/* --- Видео-карточка: рамка + подпись, чтобы не сливалась с тёмным фоном --- */
.video-card {
  border: 1px solid rgba(255,255,255,0.18);
  box-shadow: 0 24px 70px rgba(0,0,0,0.5);
}

.video-card-label {
  position: absolute;
  left: 16px;
  bottom: 16px;
  z-index: 2;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 700;
  color: #fff;
  background: rgba(18,29,32,0.72);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,0.16);
}

/* --- Список коротких фактов внутри карточек линеек --- */
.fact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.fact-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.5;
}

.fact-list li.fact-highlight {
  padding: 9px 12px 9px 28px;
  border-left: 3px solid var(--accent);
  background: rgba(245,200,0,0.12);
  font-weight: 700;
}

.fact-list li.fact-highlight::before {
  left: 11px;
}

.product-line-card.dark .fact-list li,
.product-line-card.steel .fact-list li { color: inherit; }

.fact-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

/* --- Развёрнутый блок про Бетоноправ марку 5 на главной --- */
.external-cta-facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 18px;
}

.external-cta-facts li {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  font-size: 13.5px;
  line-height: 1.4;
}

@media (max-width: 980px) {
  .external-cta-facts { grid-template-columns: 1fr; }
  .material-guide { grid-template-columns: 1fr; }
  .guide-card { min-height: auto; }
  .material-selector { grid-template-columns: 1fr; }
  .selector-choices { display: grid; grid-template-columns: repeat(2, 1fr); }
  .selector-choice.active { transform: none; }
  .scheme-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .choice-route { grid-template-columns: 1fr; }
  .choice-step { min-height: 130px; }
  .choice-arrow { transform: rotate(90deg); }
  .diagnostic-note { align-items: flex-start; flex-direction: column; gap: 4px; }
}

@media (max-width: 620px) {
  .video-card-label { font-size: 11px; padding: 6px 10px; left: 10px; bottom: 10px; }
  .product-lines { grid-template-columns: 1fr; }
  .mark-explainer { grid-column: span 1; }
  .selector-choices { grid-template-columns: 1fr; }
  .selector-result { grid-template-columns: 1fr; padding: 24px; }
  .selector-result-mark { width: fit-content; min-width: 130px; }
  .selector-benefits { grid-template-columns: 1fr; }
  .comparison-row { grid-template-columns: 1fr; gap: 7px; padding: 16px 18px; }
  .comparison-heading { display: none; }
  .mark-content { grid-template-columns: 1fr; }
  .mark-media { grid-template-columns: 1fr; }
  .marks-grid { grid-template-columns: 1fr; }
  .mark-meta-row { grid-column: span 1; }
  .mark-application ol { grid-template-columns: 1fr; gap: 8px; }
  .external-cta-card { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 620px) {
  .brand-stats { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .brand-stat { padding: 12px; border-radius: 14px; }
  .brand-stat .metric { font-size: 20px; }
  .brand-stat p { font-size: 11px; }

  .product-line-card { padding: 20px; min-height: auto; }
  .product-line-card h3 { font-size: 20px; }

  .external-cta-card { padding: 20px; border-radius: 18px; }

  .product-hero { padding: 20px; border-radius: 18px; }

  .mark-toggle { padding: 16px 16px; gap: 10px; }
  .mark-badge { min-width: 74px; padding: 7px 10px; font-size: 11.5px; }
  .mark-toggle-text .mark-name { font-size: 15.5px; }
  .mark-toggle-text .mark-tagline { font-size: 12.5px; }
  .mark-chevron { width: 26px; height: 26px; font-size: 16px; }
  .mark-content { margin: 0 16px; padding-top: 16px; gap: 14px; }
  .mark-block li,
  .mark-block p { font-size: 13px; }
  .mark-media-frame { aspect-ratio: 16 / 11; }
}

.scheme-card { border-top: 5px solid var(--scheme-accent, var(--accent)); }

@media (max-width: 980px) {
  .product-hero { grid-column: span 12; }
}

.scheme-degidrol { --scheme-accent: #4d9eb8; }
.scheme-betonoprav { --scheme-accent: #d79b27; }
.scheme-kontatsid { --scheme-accent: #e2c000; }
#mark3 .hero-side {
  align-content: start;
  align-items: start;
}

#mark3 .hero-main {
  min-height: 0;
  align-self: start;
}

@media (max-width: 620px) {
  html,
  body {
    overflow-x: hidden;
  }

  .page,
  .nav {
    width: calc(100% - 20px);
    max-width: 100%;
  }

  .nav { width: 100%; }

  .card:not(.dark):not(.steel):not(.hero-main):not(.contact-form-section):not(.footer-card).guide-dark {
    background-color: #172124 !important;
    background-image:
      linear-gradient(rgba(23, 33, 36, 0.82), rgba(23, 33, 36, 0.82)),
      url("img/beton-bg.webp") !important;
    color: #fff !important;
  }

  .card.guide-dark h3,
  .card.guide-dark p { color: #fff !important; }

  .nav {
    position: sticky;
    top: max(8px, env(safe-area-inset-top));
    margin-top: max(10px, env(safe-area-inset-top));
  }

  .nav-menu-toggle {
    width: 36px;
    height: 36px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    flex-shrink: 0;
    padding: 0;
    border-radius: 10px;
    background: rgba(255,255,255,0.12);
    color: #fff;
  }

  .nav-menu-toggle span {
    width: 16px;
    height: 2px;
    border-radius: 2px;
    background: currentColor;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .nav-menu-toggle.is-open span:first-child { transform: translateY(6px) rotate(45deg); }
  .nav-menu-toggle.is-open span:nth-child(2) { opacity: 0; }
  .nav-menu-toggle.is-open span:last-child { transform: translateY(-6px) rotate(-45deg); }

  .nav-links,
  .nav-links.is-open {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    z-index: 5;
    display: none !important;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 10px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 18px;
    background: #172124;
    box-shadow: 0 16px 34px rgba(0,0,0,0.24);
  }

  .nav-links.is-open { display: flex !important; }
  .nav-links a { padding: 12px 14px; border-radius: 10px; }
  .nav-links a:hover { background: rgba(255,255,255,0.1); }

  .nav-contacts { gap: 5px; }
  .nav-icon-btn,
  .nav-phone {
    display: inline-flex !important;
    width: 34px;
    height: 34px;
    min-height: 34px;
    padding: 0;
    border-radius: 50%;
  }

  .nav-icon-btn svg { width: 17px; height: 17px; }
  .nav-phone { font-size: 0; }
  .nav-phone svg { display: block; }
  .nav-request { display: none !important; }

  .product-hero + .hero-side .video-card { display: none; }

  #mark3 .hero-side {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  #mark3 .hero-side .mini {
    min-height: 0;
    height: auto;
  }

  .brand-stats,
  .product-lines,
  .case-grid,
  #features .bento {
    display: flex !important;
    gap: 10px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .brand-stats::-webkit-scrollbar,
  .product-lines::-webkit-scrollbar,
  .case-grid::-webkit-scrollbar,
  #features .bento::-webkit-scrollbar { display: none; }

  .brand-stat,
  .product-line-card,
  .case-card,
  #features .bento > .card {
    flex: 0 0 86%;
    scroll-snap-align: start;
  }

  #selection .selector-choices {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    overflow: visible;
  }

  #selection .material-selector {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 12px;
    border: 1px solid rgba(16,24,27,0.12);
    border-radius: 20px;
    background: rgba(255,255,255,0.62);
    box-shadow: 0 14px 34px rgba(16,24,27,0.1);
  }

  #selection .selector-step-label {
    grid-column: 1 / -1;
    margin: 2px 2px 0;
  }

  #selection .selector-result {
    width: 100%;
    min-height: 0;
    padding: 16px;
    grid-template-columns: 1fr;
    gap: 10px;
    border-radius: 16px;
    background-image: linear-gradient(90deg, rgba(18,29,32,0.86), rgba(18,29,32,0.62)) !important;
    background-position: center;
    background-size: cover;
  }

  #selection .selector-result-mark {
    width: fit-content;
    min-width: 0;
    padding: 8px 12px;
  }

  #selection .selector-title { font-size: 25px; }
  #selection .selector-description { margin-top: 8px; }
  #selection .selector-benefits { margin-top: 14px; }
  #selection .selector-link { margin-top: 14px; }

  #selection .selector-choice {
    min-height: 48px;
    padding: 10px 9px;
    font-size: 12px;
    text-align: center;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .hero-actions .btn {
    width: 100%;
    min-width: 0;
    padding-left: 8px;
    padding-right: 8px;
    text-align: center;
  }

}

@media (hover: none), (pointer: coarse), (max-width: 1024px) {
  .home-page .hero-main::before {
    content: "" !important;
    display: block !important;
    inset: 0 !important;
    background-image:
      linear-gradient(90deg, rgba(23,33,36,0.82), rgba(23,33,36,0.62)),
      url("img/каталог формула бетона.jpg") !important;
    background-position: center !important;
    background-size: cover !important;
    opacity: 0.7 !important;
    transform: none !important;
  }

  .product-hero::before {
    content: "" !important;
    display: block !important;
    inset: 0 !important;
    background-position: center !important;
    background-size: cover !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

.home-page .hero-main {
  background:
    linear-gradient(90deg, rgba(18,29,32,.88) 0%, rgba(18,29,32,.78) 56%, rgba(18,29,32,.62) 100%),
    url("img/каталог формула бетона.jpg") center / cover no-repeat !important;
}

.home-page .hero-main::before {
  display: none !important;
}

.home-page .hero-main::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0;
  background: #071012;
  pointer-events: none;
}

/* Инструкции: переключение между линейками вместо длинного списка разделов. */
.instruction-line-slider {
  position: relative;
  margin-top: 18px;
  scroll-margin-top: 100px;
}

.instruction-line-slider .instruction-line {
  display: none;
  padding-top: 22px;
}

.instruction-line-slider .instruction-line::after { content: none; }

.instruction-line-slider .instruction-line.is-active {
  display: block;
  animation: instructionLineIn .35s ease both;
}

.instruction-line-slider .instruction-line-modal-open {
  animation: none;
  transform: none;
}

@keyframes instructionLineIn {
  from { opacity: 0; transform: translateX(16px); }
  to { opacity: 1; transform: translateX(0); }
}

.instruction-slider-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 20px 0 36px;
  padding: 14px 16px;
  border: 1px solid rgba(16,24,27,.1);
  border-radius: var(--radius);
  background: rgba(255,255,255,.76);
}

.instruction-slider-controls > button {
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  border: 1px solid rgba(16,24,27,.18);
  border-radius: 50%;
  background: #fff;
  color: var(--dark);
  font-size: 22px;
  cursor: pointer;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}

.instruction-slider-controls > button:hover { background: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.instruction-slider-dots { display: flex; justify-content: center; gap: 8px; }
.instruction-slider-dots button { padding: 10px 14px; border: 1px solid transparent; border-radius: 999px; background: transparent; color: var(--muted); font: 800 12px/1 "IBM Plex Sans", Arial, sans-serif; cursor: pointer; transition: background .18s ease, color .18s ease; }
.instruction-slider-dots button span { margin-left: 5px; font-weight: 700; }
.instruction-slider-dots button.is-active { background: var(--dark); color: var(--accent); }

@media (max-width: 700px) {
  .instruction-line-slider { margin-top: 8px; }
  .instruction-line-slider .instruction-line { padding-top: 12px; }
  .instruction-slider-controls { gap: 8px; margin-bottom: 24px; padding: 10px; }
  .instruction-slider-controls > button { width: 36px; height: 36px; }
  .instruction-slider-dots { min-width: 0; gap: 3px; }
  .instruction-slider-dots button { padding: 9px 7px; font-size: 11px; }
  .instruction-slider-dots button span { display: none; }
}

/* Финальная полировка интерфейса: спокойнее поверхности, яснее навигация. */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.nav-links a {
  position: relative;
  padding: 8px 2px;
  transition: color .18s ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  right: 2px;
  bottom: 1px;
  left: 2px;
  height: 2px;
  border-radius: 99px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .18s ease;
}

.nav-links a.active,
.nav-links a:hover { color: #fff; }
.nav-links a.active::after,
.nav-links a:hover::after { transform: scaleX(1); }

.card {
  box-shadow: 0 10px 28px rgba(12, 18, 20, .075);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}

.btn,
.nav-request,
.nav-phone {
  transition: transform .18s ease, box-shadow .18s ease, background-color .18s ease, border-color .18s ease;
}

.btn-primary,
.nav-request {
  box-shadow: 0 8px 18px rgba(245, 200, 0, .18);
}

@media (hover: hover) and (pointer: fine) {
  .card:not(.hero-main):not(.mark-card.open):not(.instruction-card.is-open):hover {
    transform: translateY(-3px);
    border-color: rgba(16, 24, 27, .16);
    box-shadow: 0 16px 34px rgba(12, 18, 20, .12);
  }

  .dark.card:not(.mark-card.open):not(.instruction-card.is-open):hover { border-color: rgba(255, 255, 255, .2); }

  .btn:hover,
  .nav-request:hover,
  .nav-phone:hover {
    transform: translateY(-2px);
  }

  .btn-primary:hover,
  .nav-request:hover {
    box-shadow: 0 12px 24px rgba(245, 200, 0, .28);
  }
}

@media (max-width: 620px) {
  .nav-links a { padding: 12px 14px; }
  .nav-links a::after { right: 14px; left: 14px; bottom: 7px; }
  .card { box-shadow: 0 7px 20px rgba(12, 18, 20, .07); }
}

/* На главной заголовок остаётся выразительным, но не перегружает первый экран. */
@media (min-width: 621px) {
  .home-page .hero-main h1 {
    font-size: clamp(34px, 4.1vw, 56px);
  }
}

/* Наведение подтверждает доступность элемента, но не сдвигает интерфейс. */
@media (hover: hover) and (pointer: fine) {
  .nav-icon-btn:hover,
  .nav-phone:hover,
  .nav-request:hover,
  .btn:hover,
  .local-nav a:hover,
  .review-card:hover,
  .certificate-card:hover,
  .apply-photo:hover,
  .social-btn:hover,
  .mark-filter:hover,
  .mark-collapse:hover,
  .instruction-line-nav a:hover,
  .instruction-card:not(.is-open):hover,
  .instruction-slider-controls > button:hover,
  .card:not(.hero-main):not(.mark-card.open):not(.instruction-card.is-open):hover {
    transform: none;
  }
}