/* Doğan Traktör — design system and layout.
   Written as layered sections: tokens, reset, primitives, then components. */

/* ---------- 1. Design tokens ---------- */
:root {
  /* Industrial palette: graphite structure, amber for action, field green as
     a secondary accent that nods to agriculture without copying a brand. */
  --c-ink: #12161b;
  --c-ink-soft: #2a323b;
  --c-body: #46515d;
  --c-muted: #7b8794;
  --c-line: #e2e6ea;
  --c-line-strong: #cbd2d9;
  --c-surface: #ffffff;
  --c-surface-alt: #f6f7f9;
  --c-surface-deep: #eceff2;

  --c-accent: #e07a0c;
  --c-accent-dark: #b45f05;
  --c-accent-soft: #fdf1e2;
  --c-field: #2f6b3f;
  --c-field-soft: #eaf2ec;
  --c-danger: #b42318;
  --c-success: #217a4b;

  --font-body: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-head: "Barlow Condensed", "Inter", system-ui, sans-serif;

  --step--1: clamp(0.82rem, 0.79rem + 0.12vw, 0.88rem);
  --step-0: clamp(0.95rem, 0.92rem + 0.15vw, 1.02rem);
  --step-1: clamp(1.12rem, 1.05rem + 0.35vw, 1.3rem);
  --step-2: clamp(1.4rem, 1.25rem + 0.7vw, 1.85rem);
  --step-3: clamp(1.8rem, 1.5rem + 1.4vw, 2.7rem);
  --step-4: clamp(2.2rem, 1.7rem + 2.4vw, 3.6rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;

  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(18, 22, 27, 0.06);
  --shadow: 0 4px 14px rgba(18, 22, 27, 0.08);
  --shadow-lg: 0 12px 34px rgba(18, 22, 27, 0.14);

  --container: 1240px;
  --header-h: 82px;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--c-body);
  background: var(--c-surface);
  -webkit-font-smoothing: antialiased;
}
img, picture, video { max-width: 100%; display: block; }
h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--c-ink);
  line-height: 1.15;
  margin: 0 0 var(--space-3);
  font-weight: 600;
  letter-spacing: -0.01em;
}
h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); }
h4 { font-size: var(--step-1); }
p { margin: 0 0 var(--space-4); }
a { color: var(--c-accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { margin: 0 0 var(--space-4); padding-left: 1.25rem; }
:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- 3. Primitives ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.section { padding-block: var(--space-8); }
.section--tight { padding-block: var(--space-7); }
.section--alt { background: var(--c-surface-alt); }
.section-head { margin-bottom: var(--space-6); max-width: 62ch; }
.section-head--center { margin-inline: auto; text-align: center; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-head);
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-accent-dark);
  margin-bottom: var(--space-2);
}
.lead { font-size: var(--step-1); color: var(--c-ink-soft); }
.muted { color: var(--c-muted); }
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--c-ink); color: #fff; padding: var(--space-3) var(--space-4);
}
.skip-link:focus { left: var(--space-4); top: var(--space-2); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}
.hp-field { position: absolute !important; left: -9999px !important; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-head);
  font-size: var(--step-1);
  letter-spacing: 0.02em;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color .18s ease, border-color .18s ease,
              color .18s ease, transform .18s ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary { background: var(--c-accent); color: #fff; border-color: var(--c-accent); }
.btn--primary:hover { background: var(--c-accent-dark); border-color: var(--c-accent-dark); }
.btn--dark { background: var(--c-ink); color: #fff; border-color: var(--c-ink); }
.btn--dark:hover { background: var(--c-ink-soft); border-color: var(--c-ink-soft); }
.btn--ghost { background: transparent; color: var(--c-ink); border-color: var(--c-line-strong); }
.btn--ghost:hover { border-color: var(--c-ink); }
.btn--light { background: #fff; color: var(--c-ink); border-color: #fff; }
.btn--sm { font-size: var(--step-0); padding: 0.45rem 1rem; }
.btn--block { width: 100%; }

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}
.badge--new { background: var(--c-field-soft); color: var(--c-field); }
.badge--used { background: var(--c-surface-deep); color: var(--c-ink-soft); }
.badge--featured { background: var(--c-accent-soft); color: var(--c-accent-dark); }

/* ---------- 4. Header ---------- */
.topbar {
  background: var(--c-ink);
  color: #cdd5dd;
  font-size: var(--step--1);
}
.topbar__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4); min-height: 40px; flex-wrap: wrap;
}
.topbar__meta { display: flex; gap: var(--space-5); flex-wrap: wrap; }
.topbar__item { display: inline-flex; align-items: center; gap: var(--space-2); }
.topbar__phone {
  color: #fff; font-weight: 600; font-size: var(--step-0);
  display: inline-flex; align-items: center; gap: var(--space-2);
}
.topbar__phone:hover { color: var(--c-accent); text-decoration: none; }
.topbar a { color: inherit; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-line);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-5); min-height: var(--header-h);
}
.brand { display: inline-flex; align-items: center; gap: var(--space-3); }
.brand:hover { text-decoration: none; }
.brand__mark {
  width: 44px; height: 44px; flex: none;
  display: grid; place-items: center;
  background: var(--c-accent); color: #fff;
  border-radius: var(--radius);
  font-family: var(--font-head); font-size: 1.35rem; font-weight: 700;
}
.brand__name {
  font-family: var(--font-head); font-size: 1.6rem; font-weight: 700;
  color: var(--c-ink); line-height: 1; letter-spacing: -0.01em;
}
.brand__tag {
  display: block; font-family: var(--font-body);
  font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--c-muted); margin-top: 3px;
}

.nav { display: flex; align-items: center; gap: var(--space-5); }
.nav__list { display: flex; gap: var(--space-5); list-style: none; margin: 0; padding: 0; }
.nav__link {
  font-family: var(--font-head); font-size: 1.12rem; letter-spacing: 0.01em;
  color: var(--c-ink-soft); padding-block: var(--space-2);
  border-bottom: 2px solid transparent;
}
.nav__link:hover, .nav__link[aria-current="page"] {
  color: var(--c-ink); border-bottom-color: var(--c-accent); text-decoration: none;
}
.nav-toggle {
  display: none; background: none; border: 1px solid var(--c-line-strong);
  border-radius: var(--radius); padding: 0.5rem 0.65rem; cursor: pointer;
}
.nav-toggle__bar {
  display: block; width: 20px; height: 2px; background: var(--c-ink);
  margin: 4px 0; transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 5. Hero slider ---------- */
.hero { position: relative; background: var(--c-ink); overflow: hidden; }
.hero__track { position: relative; }
.hero__slide {
  position: absolute; inset: 0; opacity: 0; visibility: hidden;
  transition: opacity .7s ease;
}
/* Exactly one slide is in flow at a time — it is what gives the hero its
   height. Keeping the first child in flow as well would stack two slides and
   push the active one below an invisible gap. */
.hero__slide.is-active {
  position: relative; opacity: 1; visibility: visible; z-index: 2;
}
.hero__media { position: relative; }
.hero__media img {
  width: 100%; height: clamp(360px, 58vh, 620px); object-fit: cover;
}
.hero__media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(10, 13, 17, .86) 8%,
              rgba(10, 13, 17, .55) 46%, rgba(10, 13, 17, .12) 78%);
}
.hero__content {
  position: absolute; inset: 0; z-index: 3;
  display: flex; align-items: center;
}
.hero__text { max-width: 40rem; color: #fff; }
.hero__text h2, .hero__text h1 { color: #fff; font-size: var(--step-4); margin-bottom: var(--space-4); }
.hero__text p { font-size: var(--step-1); color: #dfe5ea; margin-bottom: var(--space-5); }
.hero__actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.hero__dots {
  position: absolute; z-index: 4; bottom: var(--space-5); left: 50%;
  transform: translateX(-50%); display: flex; gap: var(--space-2);
}
.hero__dot {
  width: 34px; height: 4px; border: none; padding: 0; cursor: pointer;
  background: rgba(255, 255, 255, .4); border-radius: 2px;
  transition: background-color .2s ease;
}
.hero__dot.is-active { background: var(--c-accent); }
.hero__arrow {
  position: absolute; top: 50%; z-index: 4; transform: translateY(-50%);
  width: 44px; height: 44px; border-radius: 50%; cursor: pointer;
  background: rgba(255, 255, 255, .16); border: 1px solid rgba(255, 255, 255, .3);
  color: #fff; font-size: 1.2rem; display: grid; place-items: center;
}
.hero__arrow:hover { background: rgba(255, 255, 255, .3); }
.hero__arrow--prev { left: var(--space-4); }
.hero__arrow--next { right: var(--space-4); }

/* ---------- 6. Quick facts strip ---------- */
.facts { background: var(--c-ink); color: #c9d1d9; }
.facts__grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-5); padding-block: var(--space-5);
}
.fact { display: flex; gap: var(--space-3); align-items: flex-start; }
.fact__icon { color: var(--c-accent); flex: none; margin-top: 3px; }
.fact__title { color: #fff; font-family: var(--font-head); font-size: 1.15rem; }
.fact p { margin: 0; font-size: var(--step--1); }

/* ---------- 7. Brand row ---------- */
.brand-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-4);
}
.brand-card {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--space-3); text-align: center;
  background: var(--c-surface); border: 1px solid var(--c-line);
  border-radius: var(--radius-lg); padding: var(--space-5) var(--space-4);
  min-height: 160px; transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}
.brand-card:hover {
  border-color: var(--c-accent); box-shadow: var(--shadow);
  transform: translateY(-3px); text-decoration: none;
}
.brand-card__logo { height: 56px; display: grid; place-items: center; }
.brand-card__logo img { max-height: 56px; width: auto; object-fit: contain; }
.brand-card__name {
  font-family: var(--font-head); font-size: 1.25rem; color: var(--c-ink);
}
.brand-card__meta { font-size: var(--step--1); color: var(--c-muted); }

/* ---------- 8. Product card & grid ---------- */
/* Fixed column counts rather than auto-fill: the brief asks for three or four
   products per row, and auto-fill drifts to five on wide screens. */
.product-grid {
  display: grid; gap: var(--space-4);
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.catalog .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (min-width: 1180px) {
  .catalog .product-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (max-width: 1080px) { .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 820px) {
  .product-grid, .catalog .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.product-card {
  display: flex; flex-direction: column;
  background: var(--c-surface); border: 1px solid var(--c-line);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}
.product-card:hover {
  border-color: var(--c-line-strong); box-shadow: var(--shadow); transform: translateY(-3px);
}
.product-card__media {
  position: relative; aspect-ratio: 4 / 3; background: var(--c-surface-alt);
  display: grid; place-items: center; overflow: hidden;
}
.product-card__media img { width: 100%; height: 100%; object-fit: cover; }
.product-card__placeholder {
  color: var(--c-line-strong); font-family: var(--font-head); font-size: 2rem;
}
.product-card__badges {
  position: absolute; top: var(--space-2); left: var(--space-2);
  display: flex; gap: var(--space-1); flex-wrap: wrap;
}
.product-card__body { padding: var(--space-4); display: flex; flex-direction: column; flex: 1; gap: var(--space-2); }
.product-card__brand {
  font-size: var(--step--1); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--c-accent-dark); font-weight: 600;
}
.product-card__title {
  font-family: var(--font-head); font-size: 1.2rem; line-height: 1.25;
  color: var(--c-ink); margin: 0;
}
.product-card__title a { color: inherit; }
.product-card__title a:hover { color: var(--c-accent-dark); text-decoration: none; }
.product-card__code {
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: var(--step--1); color: var(--c-body);
  background: var(--c-surface-alt); border: 1px solid var(--c-line);
  border-radius: var(--radius-sm); padding: 0.15rem 0.45rem; align-self: flex-start;
}
.product-card__foot {
  margin-top: auto; padding-top: var(--space-3); border-top: 1px solid var(--c-line);
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-2);
  font-size: var(--step--1);
}
.product-card__foot .muted {
  /* Long category names must not wrap and stagger the card heights. */
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0;
}
.product-card__foot a { flex: none; }

/* ---------- 9. Catalogue layout ---------- */
.catalog {
  display: grid; grid-template-columns: 272px minmax(0, 1fr);
  gap: var(--space-6); align-items: start;
}
.filters {
  position: sticky; top: calc(var(--header-h) + var(--space-4));
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  background: var(--c-surface); overflow: hidden;
}
.filters__head {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-4); border-bottom: 1px solid var(--c-line);
  background: var(--c-surface-alt);
}
.filters__title { font-family: var(--font-head); font-size: 1.2rem; color: var(--c-ink); }
.filters__reset { font-size: var(--step--1); color: var(--c-accent-dark); }
.filter-group { border-bottom: 1px solid var(--c-line); }
.filter-group:last-child { border-bottom: none; }
.filter-group__toggle {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  background: none; border: none; cursor: pointer; text-align: left;
  padding: var(--space-4); font-family: var(--font-head); font-size: 1.05rem;
  color: var(--c-ink); letter-spacing: 0.02em;
}
.filter-group__toggle::after {
  content: ""; width: 8px; height: 8px; flex: none;
  border-right: 2px solid var(--c-muted); border-bottom: 2px solid var(--c-muted);
  transform: rotate(45deg) translate(-2px, -2px); transition: transform .2s ease;
}
.filter-group__toggle[aria-expanded="false"]::after { transform: rotate(-45deg) translate(-2px, 2px); }
.filter-group__body { padding: 0 var(--space-4) var(--space-4); }
.filter-group__body[hidden] { display: none; }
.filter-option {
  display: flex; align-items: center; gap: var(--space-3);
  padding: 0.32rem 0; cursor: pointer; font-size: var(--step-0);
  color: var(--c-body);
}
.filter-option:hover { color: var(--c-ink); }
.filter-option input { width: 17px; height: 17px; accent-color: var(--c-accent); flex: none; cursor: pointer; }
.filter-option--child { padding-left: var(--space-5); font-size: var(--step--1); }

.catalog__bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-4);
}
.catalog__count { font-size: var(--step-0); color: var(--c-body); }
.catalog__count strong { color: var(--c-ink); }
.chips { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-4); }
.chip {
  display: inline-flex; align-items: center; gap: var(--space-2);
  background: var(--c-accent-soft); color: var(--c-accent-dark);
  border: 1px solid #f3ddc0; border-radius: 999px;
  padding: 0.2rem 0.5rem 0.2rem 0.75rem; font-size: var(--step--1);
}
.chip:hover { text-decoration: none; background: #fbe6cd; }
.chip__x { font-size: 1rem; line-height: 1; }
.catalog__bar .form-select {
  /* Sits beside the result count, so it must not stretch like a form field. */
  width: auto; min-width: 190px;
  border: 1px solid var(--c-line-strong); border-radius: var(--radius);
  padding: 0.45rem 0.7rem; font: inherit; font-size: var(--step-0);
  color: var(--c-ink); background: #fff; cursor: pointer;
}
.filters-toggle { display: none; }
.results { transition: opacity .15s ease; }
.results.is-loading { opacity: .45; pointer-events: none; }

.empty-state {
  text-align: center; padding: var(--space-8) var(--space-4);
  border: 1px dashed var(--c-line-strong); border-radius: var(--radius-lg);
  background: var(--c-surface-alt);
}

/* ---------- 10. Pagination ---------- */
.pagination {
  display: flex; justify-content: center; gap: var(--space-2);
  margin-top: var(--space-6); flex-wrap: wrap;
}
.pagination a, .pagination span {
  min-width: 40px; height: 40px; padding-inline: 0.6rem;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--c-line-strong); border-radius: var(--radius);
  color: var(--c-ink); font-size: var(--step-0);
}
.pagination a:hover { border-color: var(--c-accent); color: var(--c-accent-dark); text-decoration: none; }
.pagination .is-current { background: var(--c-ink); border-color: var(--c-ink); color: #fff; }
.pagination .is-disabled { color: var(--c-line-strong); border-color: var(--c-line); }

/* ---------- 11. Banners ---------- */
.banner-grid {
  display: grid; gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.banner {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  min-height: 220px; display: flex; align-items: flex-end;
  background: var(--c-ink);
}
.banner img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.banner::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(12, 16, 20, .88) 5%, rgba(12, 16, 20, .15) 70%);
}
.banner__body { position: relative; z-index: 2; padding: var(--space-5); color: #fff; }
.banner__body h3 { color: #fff; margin-bottom: var(--space-1); font-size: var(--step-2); }
.banner__body p { color: #d8dee4; margin: 0; font-size: var(--step-0); }
.banner:hover img { transform: scale(1.04); }
.banner img { transition: transform .5s ease; }

/* ---------- 12. Product detail ---------- */
.breadcrumbs {
  font-size: var(--step--1); color: var(--c-muted);
  padding-block: var(--space-4); display: flex; flex-wrap: wrap; gap: var(--space-2);
}
.breadcrumbs a { color: var(--c-body); }
.breadcrumbs span[aria-current] { color: var(--c-ink); }

.detail { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: var(--space-7); }
.gallery__main {
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  overflow: hidden; background: var(--c-surface-alt); aspect-ratio: 4 / 3;
}
.gallery__main img { width: 100%; height: 100%; object-fit: cover; }
.gallery__thumbs {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(84px, 1fr));
  gap: var(--space-2); margin-top: var(--space-3);
}
.gallery__thumb {
  border: 2px solid var(--c-line); border-radius: var(--radius);
  overflow: hidden; padding: 0; background: none; cursor: pointer; aspect-ratio: 1;
}
.gallery__thumb img { width: 100%; height: 100%; object-fit: cover; }
.gallery__thumb.is-active { border-color: var(--c-accent); }

.spec-table { width: 100%; border-collapse: collapse; margin-bottom: var(--space-5); }
.spec-table th, .spec-table td {
  text-align: left; padding: var(--space-3) 0; border-bottom: 1px solid var(--c-line);
  font-size: var(--step-0); vertical-align: top;
}
.spec-table th { color: var(--c-muted); font-weight: 500; width: 40%; }
.spec-table td { color: var(--c-ink); }
.code-list { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.code-pill {
  font-family: ui-monospace, Menlo, Consolas, monospace; font-size: var(--step--1);
  background: var(--c-surface-alt); border: 1px solid var(--c-line);
  border-radius: var(--radius-sm); padding: 0.1rem 0.4rem;
}
.cta-box {
  background: var(--c-ink); color: #cfd6dd; border-radius: var(--radius-lg);
  padding: var(--space-5); margin-top: var(--space-5);
}
.cta-box h3 { color: #fff; }
.cta-box__actions { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-top: var(--space-4); }

/* ---------- 13. Forms ---------- */
.form-grid { display: grid; gap: var(--space-4); grid-template-columns: repeat(2, minmax(0, 1fr)); }
.form-row { display: flex; flex-direction: column; gap: var(--space-2); }
.form-row--full { grid-column: 1 / -1; }
.form-row label { font-size: var(--step--1); font-weight: 600; color: var(--c-ink-soft); }
.form-input, .form-select, .form-file {
  width: 100%; font: inherit; font-size: var(--step-0); color: var(--c-ink);
  background: #fff; border: 1px solid var(--c-line-strong);
  border-radius: var(--radius); padding: 0.62rem 0.8rem;
  transition: border-color .18s ease, box-shadow .18s ease;
}
.form-input:focus, .form-select:focus {
  border-color: var(--c-accent); box-shadow: 0 0 0 3px var(--c-accent-soft); outline: none;
}
.form-textarea { resize: vertical; min-height: 130px; }
.form-help { font-size: var(--step--1); color: var(--c-muted); }
.form-error { font-size: var(--step--1); color: var(--c-danger); }
.form-input.has-error { border-color: var(--c-danger); }
.required-mark { color: var(--c-danger); }

.alert {
  border-radius: var(--radius); padding: var(--space-4);
  margin-bottom: var(--space-5); border: 1px solid;
  font-size: var(--step-0);
}
.alert--success { background: #edf7f1; border-color: #bfe0cd; color: var(--c-success); }
.alert--error { background: #fdf0ef; border-color: #f3c8c4; color: var(--c-danger); }

/* ---------- 14. Contact ---------- */
.contact-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: var(--space-7); }
.info-card {
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  padding: var(--space-5); background: var(--c-surface); box-shadow: var(--shadow-sm);
}
.info-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-4); }
.info-list li { display: flex; gap: var(--space-3); align-items: flex-start; }
.info-list__icon { color: var(--c-accent); flex: none; margin-top: 3px; }
.info-list__label {
  display: block; font-size: var(--step--1); text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--c-muted); margin-bottom: 2px;
}
.info-list__value { color: var(--c-ink); font-size: var(--step-0); }
.map-frame {
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  overflow: hidden; margin-top: var(--space-6); line-height: 0;
}
.map-frame iframe { width: 100%; height: 420px; border: 0; }

/* ---------- 15. Footer ---------- */
.site-footer { background: var(--c-ink); color: #a7b1bb; padding-top: var(--space-7); }
.footer-grid {
  display: grid; gap: var(--space-6);
  grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr));
  padding-bottom: var(--space-6);
}
.site-footer h4 {
  color: #fff; font-size: 1.15rem; letter-spacing: 0.04em;
  text-transform: uppercase; margin-bottom: var(--space-4);
}
.site-footer a { color: #a7b1bb; }
.site-footer a:hover { color: var(--c-accent); text-decoration: none; }
.footer-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); font-size: var(--step-0); }
.footer-note { font-size: var(--step--1); line-height: 1.7; }
.footer-bottom {
  border-top: 1px solid #23292f; padding-block: var(--space-4);
  display: flex; justify-content: space-between; gap: var(--space-4);
  flex-wrap: wrap; font-size: var(--step--1);
}
.social { display: flex; gap: var(--space-3); margin-top: var(--space-4); }
.social a {
  width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center;
  background: #1d232a; color: #cdd5dd;
}
.social a:hover { background: var(--c-accent); color: #fff; }

/* ---------- 16. Floating call button (mobile) ---------- */
.call-fab {
  display: none; position: fixed; z-index: 60;
  left: var(--space-4); right: var(--space-4); bottom: var(--space-4);
  gap: var(--space-3);
}
.call-fab .btn { flex: 1; box-shadow: var(--shadow-lg); }

/* ---------- 17. Responsive ---------- */
@media (max-width: 1080px) {
  .catalog { grid-template-columns: 240px minmax(0, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .detail, .contact-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .nav-toggle { display: block; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    background: #fff; border-bottom: 1px solid var(--c-line);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: var(--space-3) var(--space-4) var(--space-5);
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
  }
  .nav.is-open { transform: translateY(0); opacity: 1; visibility: visible; }
  .nav__list { flex-direction: column; gap: 0; }
  .nav__link { display: block; padding: var(--space-3) 0; border-bottom: 1px solid var(--c-line); }
  .nav .btn { margin-top: var(--space-4); }
  .catalog { grid-template-columns: 1fr; }
  .filters { position: static; }
  .filters.is-collapsed .filters__body { display: none; }
  .filters-toggle { display: inline-flex; }
  .call-fab { display: flex; }
  body { padding-bottom: 76px; }
}

@media (max-width: 640px) {
  :root { --header-h: 66px; }
  .topbar__meta { display: none; }
  .topbar__inner { justify-content: center; }
  .hero__media img { height: clamp(420px, 70vh, 560px); }
  .hero__media::after { background: linear-gradient(to top, rgba(10,13,17,.92) 20%, rgba(10,13,17,.45) 100%); }
  .hero__content { align-items: flex-end; padding-bottom: var(--space-7); }
  .form-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .brand__tag { display: none; }
  .product-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: var(--space-3); }
  .section { padding-block: var(--space-7); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important; transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  .topbar, .site-header, .site-footer, .call-fab, .filters { display: none; }
}