/* Цэпү Констракшн — landing page
   Palette comes from the logo: logo blue as the brand field, logo amber
   only for actions and focus. Concrete for the page, slate ink for text. */

:root {
  --blue: #0a5294;
  --blue-deep: #073d70;
  --concrete: #e4e5e1;
  --concrete-light: #f1f2ef;
  --ink: #141a24;
  --steel: #5b6470;
  --amber: #eb8e03;
  --white: #ffffff;

  --font-display: "Unbounded", system-ui, sans-serif;
  --font-body: "Onest", system-ui, sans-serif;

  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --max: 88rem;
  --header-h: 5.5rem;
  --band-h: 5.5rem;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--ink);
  background: var(--concrete);
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
ul[role="list"] { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, p { margin: 0; }

:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: .75rem 1rem;
  background: var(--amber);
  color: var(--ink);
  font-weight: 600;
}
.skip-link:focus { top: 1rem; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 var(--gutter);
  background: var(--white);
  transition: box-shadow .3s;
}
.site-header.is-scrolled { box-shadow: 0 8px 24px -12px rgb(20 26 36 / .35); }

.brand { display: block; flex-shrink: 0; }
.brand img { width: auto; height: clamp(2.25rem, 4vw, 3rem); }

/* ---------- Site nav ---------- */

.site-nav {
  display: flex;
  align-items: center;
  gap: .25rem;
}
.site-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 3.5rem;
  padding: 0 1.25rem;
  font: 700 clamp(1rem, 1.6vw, 1.25rem)/1 var(--font-display);
  color: var(--blue);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .2s;
}
.site-nav__link:hover { background: var(--concrete-light); }
.site-nav__link[aria-current="page"] {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
}

/* ---------- Catalogues dropdown ---------- */

.catalogues { position: relative; }

.catalogues__toggle {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  min-height: 3.5rem;
  padding: 0 1rem 0 1.25rem;
  font: 700 clamp(1rem, 1.6vw, 1.25rem)/1 var(--font-display);
  color: var(--blue);
  background: transparent;
  border: 0;
  cursor: pointer;
  transition: background-color .2s;
}
.catalogues__toggle:hover,
.catalogues__toggle[aria-expanded="true"] { background: var(--concrete-light); }

.catalogues__chevron {
  width: 1.1em;
  height: 1.1em;
  transition: transform .25s ease;
}
.catalogues__toggle[aria-expanded="true"] .catalogues__chevron { transform: rotate(180deg); }

.catalogues__menu {
  position: absolute;
  right: 0;
  top: 100%;
  width: min(26rem, calc(100vw - 2 * var(--gutter)));
  padding-top: .5rem; /* hover bridge between button and panel */
  opacity: 0;
  visibility: hidden;
  transition: opacity .15s ease, visibility 0s linear .15s;
}
.catalogues.is-open .catalogues__menu {
  opacity: 1;
  visibility: visible;
  transition: opacity .15s ease, visibility 0s;
}
.catalogues__menu > ul {
  padding: .5rem;
  background: var(--white);
  color: var(--ink);
  border: 1px solid var(--concrete);
  box-shadow: 0 16px 32px -16px rgb(20 26 36 / .3);
}

.catalogues__item {
  display: grid;
  grid-template-columns: 8rem 1fr;
  align-items: center;
  gap: 1rem;
  padding: .75rem;
  text-decoration: none;
  transition: background-color .15s;
}
.catalogues__item:hover,
.catalogues__item:focus-visible { background: var(--concrete-light); }
.catalogues__item img {
  width: 8rem;
  aspect-ratio: 8 / 5;
  padding: .75rem;
  object-fit: contain;
  background: var(--white);
  border: 1px solid var(--concrete);
}
.catalogues__item strong {
  display: block;
  font: 700 1.25rem/1.2 var(--font-display);
}
.catalogues__item small {
  display: block;
  margin-top: .25rem;
  font-size: .9375rem;
  color: var(--steel);
}

/* ---------- Hero ---------- */

.hero {
  /* leaves room for the distributor band on the first screen */
  height: calc(100svh - var(--band-h));
  min-height: 28rem;
  padding-top: var(--header-h);
  background: var(--blue);
}
.hero picture { display: block; height: 100%; }
.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- Distributor band ---------- */

.distributor {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .75rem 2rem;
  min-height: var(--band-h);
  padding: 1rem var(--gutter);
  background: var(--white);
  border-bottom: 1px solid var(--concrete);
}
.distributor__logo {
  width: auto;
  height: 1.75rem;
  padding-right: 2rem;
  border-right: 1px solid var(--concrete);
}
.distributor__text {
  flex: 1 1 20rem;
  font-weight: 500;
}
.distributor__link {
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
  white-space: nowrap;
}
.distributor__link:hover { text-decoration: underline; text-underline-offset: 4px; }

/* ---------- About ---------- */

.about {
  padding: calc(var(--header-h) + clamp(3rem, 8vw, 6rem)) var(--gutter) clamp(4rem, 10vw, 7rem);
  background: var(--concrete-light);
}

.about__body {
  max-width: 44rem;
  margin: 0 auto;
}

.about__head {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--blue);
}
.about__head h1 {
  font: 800 clamp(1.75rem, 4vw, 2.75rem)/1.1 var(--font-display);
  letter-spacing: -.01em;
  color: var(--ink);
}

.about__body > p + p { margin-top: 1rem; }
.about__body h2 {
  margin: 3rem 0 1rem;
  font: 700 1.25rem/1.3 var(--font-display);
  color: var(--blue);
}
.about__body h3 {
  margin: 2rem 0 .75rem;
  font-size: 1.0625rem;
  font-weight: 600;
}

.about__projects,
.about__points {
  margin: 0;
  padding-left: 1.5rem;
}
.about__projects li + li,
.about__points li + li { margin-top: .6rem; }
.about__projects li::marker { font-weight: 600; color: var(--blue); }
.about__points li::marker { color: var(--amber); }

/* ---------- Catalogue ---------- */

.catalogue {
  max-width: var(--max);
  margin: 0 auto;
  padding: calc(var(--header-h) + clamp(2.5rem, 6vw, 4.5rem)) var(--gutter) clamp(4rem, 8vw, 6rem);
}

.catalogue__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: .5rem 1.5rem;
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--blue);
}
.catalogue__head h1 {
  font: 800 clamp(2rem, 4.5vw, 3.25rem)/1.05 var(--font-display);
  letter-spacing: -.02em;
  color: var(--ink);
}
.catalogue__count { color: var(--steel); }

.catalogue__layout {
  display: grid;
  grid-template-columns: 17rem minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
}

.catalogue__filters {
  position: sticky;
  top: calc(var(--header-h) + 1.5rem);
}

.category {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  width: 100%;
  padding: .7rem .9rem;
  font: inherit;
  font-size: .9375rem;
  line-height: 1.35;
  text-align: left;
  color: var(--ink);
  background: none;
  border: 0;
  border-left: 3px solid transparent;
  cursor: pointer;
  transition: background-color .15s;
}
.category:hover { background: var(--concrete-light); }
.category[aria-pressed="true"] {
  font-weight: 600;
  color: var(--blue);
  background: var(--concrete-light);
  border-left-color: var(--blue);
}
.category__count {
  flex-shrink: 0;
  font-size: .8125rem;
  font-weight: 500;
  color: var(--steel);
}

.catalogue__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
  gap: 1rem;
}

.product-card {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  padding: 0;
  font: inherit;
  text-align: left;
  color: var(--ink);
  background: var(--white);
  border: 0;
  cursor: pointer;
}
.product-card__media {
  display: grid;
  place-items: center;
  aspect-ratio: 1200 / 950;
  padding: .75rem;
  background: var(--white);
}
.product-card__media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.product-card__placeholder {
  font: 800 2.5rem/1 var(--font-display);
  color: var(--concrete);
}
.product-card__name {
  padding: .9rem 1rem 1.1rem;
  font-size: .9375rem;
  font-weight: 500;
  line-height: 1.35;
  border-top: 1px solid var(--concrete-light);
}
.product-card:hover .product-card__name {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.catalogue__empty {
  padding: 3rem 0;
  color: var(--steel);
}

/* ---------- Product modal ---------- */

.product-modal {
  width: min(60rem, calc(100vw - 2rem));
  max-height: calc(100svh - 2rem);
  padding: 0;
  color: var(--ink);
  background: var(--white);
  border: 0;
  box-shadow: 0 32px 64px -24px rgb(20 26 36 / .5);
}
.product-modal::backdrop { background: rgb(7 61 112 / .55); }

.product-modal__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
}

.product-modal__close {
  position: absolute;
  top: .75rem;
  right: .75rem;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  color: var(--ink);
  background: var(--white);
  border: 0;
  cursor: pointer;
}
.product-modal__close:hover { background: var(--concrete-light); }
.product-modal__close svg { width: 1.25rem; height: 1.25rem; }

.product-modal__media {
  display: grid;
  place-items: center;
  padding: 2rem;
  background: var(--white);
  border-right: 1px solid var(--concrete-light);
}
.product-modal__media img { width: 100%; height: auto; }

.product-modal__body {
  display: flex;
  flex-direction: column;
  padding: 3.5rem 2.5rem 2.5rem 2rem;
}
.product-modal__category {
  font-size: .875rem;
  color: var(--steel);
}
.product-modal__body h2 {
  margin-top: .5rem;
  font: 700 clamp(1.25rem, 2.2vw, 1.625rem)/1.2 var(--font-display);
  letter-spacing: -.01em;
}

.product-modal__fields {
  margin: 1.75rem 0 0;
}
.product-modal__fields dt {
  font-size: .875rem;
  font-weight: 600;
  color: var(--steel);
}
.product-modal__fields dd {
  margin: .25rem 0 1.25rem;
}
.product-modal__fields dd li + li { margin-top: .15rem; }
.product-modal__fields dd ul { list-style: none; margin: 0; padding: 0; }

.product-modal__notes p + p { margin-top: .75rem; }

.product-modal__link {
  display: inline-flex;
  flex-direction: column;
  align-self: flex-start;
  margin-top: auto;
  padding: .85rem 1.25rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--white);
  background: var(--blue);
  text-decoration: none;
  transition: background-color .2s;
}
.product-modal__link:hover { background: var(--blue-deep); }
.product-modal__link span {
  font-size: .8125rem;
  font-weight: 400;
  opacity: .8;
}

/* ---------- Footer ---------- */

.site-footer {
  padding: clamp(3.5rem, 6vw, 5rem) var(--gutter);
  color: var(--white);
  background: var(--blue-deep);
}

.footer__main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  max-width: var(--max);
  margin: 0 auto;
}

.footer__logo { width: min(100%, 16rem); }

.footer__col h2 {
  margin-bottom: 1rem;
  font-size: .9375rem;
  font-weight: 600;
  color: rgb(255 255 255 / .6);
}
.footer__col li + li { margin-top: .5rem; }
.footer__col a { text-decoration: none; overflow-wrap: anywhere; }
.footer__col a:hover { text-decoration: underline; text-underline-offset: 4px; }


/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .catalogue__layout { grid-template-columns: minmax(0, 1fr); }
  .catalogue__filters { position: static; margin: 0 calc(var(--gutter) * -1); }
  .catalogue__filters ul {
    display: flex;
    gap: .5rem;
    overflow-x: auto;
    padding: 0 var(--gutter) .25rem;
    scrollbar-width: none;
  }
  .category {
    white-space: nowrap;
    padding: .6rem .9rem;
    background: var(--white);
    border-left: 0;
    border-bottom: 3px solid transparent;
  }
  .category[aria-pressed="true"] { border-bottom-color: var(--blue); }
  .product-modal__inner { grid-template-columns: 1fr; }
  .product-modal__media { padding: 2.5rem 1.5rem 1rem; border-right: 0; }
  .product-modal__body { padding: 1rem 1.5rem 1.75rem; }
  .product-modal__link { margin-top: 1.5rem; }
  .footer__main { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__logo { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .distributor__logo { padding-right: 0; border-right: 0; }
  .footer__main { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__col:first-of-type { grid-column: 1 / -1; }
  .catalogue__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .5rem; }
  .product-card__name { padding: .7rem .75rem .85rem; font-size: .875rem; }
  :root { --header-h: 4.5rem; }
  .site-nav__link { display: none; } /* About stays reachable from the footer */
  .catalogues__toggle { min-height: 3rem; padding: 0 .75rem; font-size: 1rem; gap: .5rem; }
  .brand img { height: 2rem; }
  .catalogues__menu { position: fixed; left: var(--gutter); right: var(--gutter); top: var(--header-h); width: auto; }
}