:root {
  --altep-red: #e3050f;
  --altep-red-dark: #b90009;
  --altep-graphite: #141820;
  --altep-steel: #303641;
  --altep-muted: #66707c;
  --altep-line: #dfe3e8;
  --altep-surface: #f4f6f8;
  --altep-white: #fff;
  --altep-radius: 18px;
  --altep-shadow: 0 18px 50px rgba(20, 24, 32, 0.1);
}

.altep-catalog,
.altep-product {
  color: var(--altep-graphite);
  font-family: inherit;
}

.altep-catalog *,
.altep-product * {
  box-sizing: border-box;
}

.altep-eyebrow {
  color: var(--altep-red);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  margin: 0 0 0.8rem;
  text-transform: uppercase;
}

.altep-catalog {
  margin: 0 auto;
  max-width: 1320px;
  padding: 3rem 1.5rem 5rem;
  width: 100%;
}

.altep-catalog__intro {
  background:
    linear-gradient(115deg, rgba(20, 24, 32, 0.98) 0%, rgba(20, 24, 32, 0.9) 62%, rgba(227, 5, 15, 0.84) 100%),
    radial-gradient(circle at 80% 20%, #59606c 0, #141820 55%);
  border-radius: 26px;
  color: var(--altep-white);
  overflow: hidden;
  padding: clamp(2rem, 6vw, 5rem);
  position: relative;
}

.altep-catalog__intro::after {
  background: var(--altep-red);
  content: '';
  height: 0.35rem;
  inset: auto 0 0;
  position: absolute;
}

.altep-catalog__intro h1 {
  color: var(--altep-white);
  font-size: clamp(2.5rem, 6vw, 5.6rem);
  letter-spacing: -0.045em;
  line-height: 0.95;
  margin: 0 0 1.25rem;
  max-width: 850px;
}

.altep-catalog__intro > p:last-child {
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.7;
  margin: 0;
  max-width: 720px;
}

.altep-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 2rem 0;
}

.altep-filter {
  appearance: none;
  background: var(--altep-white);
  border: 1px solid var(--altep-line);
  border-radius: 999px;
  color: var(--altep-steel);
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  min-height: 44px;
  padding: 0.65rem 1.05rem;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.altep-filter:hover,
.altep-filter.is-active {
  background: var(--altep-red);
  border-color: var(--altep-red);
  color: var(--altep-white);
  transform: translateY(-1px);
}

.altep-filter:focus-visible,
.altep-selector:focus-visible,
.altep-thumbnail:focus-visible,
.altep-button:focus-visible,
.altep-card a:focus-visible {
  outline: 3px solid rgba(227, 5, 15, 0.3);
  outline-offset: 3px;
}

.altep-catalog__grid {
  display: grid;
  gap: 1.4rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.altep-card {
  background: var(--altep-white);
  border: 1px solid var(--altep-line);
  border-radius: var(--altep-radius);
  box-shadow: 0 8px 30px rgba(20, 24, 32, 0.04);
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.altep-card:hover {
  border-color: rgba(227, 5, 15, 0.45);
  box-shadow: var(--altep-shadow);
  transform: translateY(-4px);
}

.altep-card[hidden] {
  display: none;
}

.altep-card__image {
  align-items: center;
  aspect-ratio: 4 / 3;
  background: linear-gradient(145deg, #f8f9fa, #e9edf1);
  display: flex;
  justify-content: center;
  overflow: hidden;
  padding: 1.2rem;
}

.altep-card__image img {
  height: 100%;
  object-fit: contain;
  transition: transform 220ms ease;
  width: 100%;
}

.altep-card:hover .altep-card__image img {
  transform: scale(1.035);
}

.altep-card__placeholder,
.altep-product__image-placeholder {
  color: rgba(20, 24, 32, 0.14);
  font-size: clamp(2rem, 6vw, 5rem);
  font-weight: 900;
  letter-spacing: 0.16em;
}

.altep-card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 1.45rem;
}

.altep-card__category {
  color: var(--altep-red);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin: 0 0 0.55rem;
  min-height: 1em;
  text-transform: uppercase;
}

.altep-card h2 {
  font-size: clamp(1.3rem, 2.4vw, 1.8rem);
  line-height: 1.12;
  margin: 0 0 0.9rem;
}

.altep-card h2 a {
  color: var(--altep-graphite);
  text-decoration: none;
}

.altep-card__variants {
  color: var(--altep-steel);
  font-size: 0.9rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
}

.altep-card__values {
  color: var(--altep-muted);
  font-size: 0.86rem;
  line-height: 1.5;
  margin: 0 0 1.25rem;
}

.altep-card__link {
  color: var(--altep-red);
  font-weight: 800;
  margin-top: auto;
  text-decoration: none;
}

.altep-catalog__empty {
  background: var(--altep-surface);
  border-radius: var(--altep-radius);
  color: var(--altep-muted);
  margin: 2rem 0 0;
  padding: 2rem;
  text-align: center;
}

.altep-product {
  background: var(--altep-surface);
  min-height: 70vh;
  padding: 2rem 1.5rem 5rem;
}

.altep-product__shell {
  margin: 0 auto;
  max-width: 1280px;
}

.altep-breadcrumbs {
  align-items: center;
  color: var(--altep-muted);
  display: flex;
  flex-wrap: wrap;
  font-size: 0.85rem;
  gap: 0.55rem;
  margin: 0 0 1.5rem;
}

.altep-breadcrumbs a {
  color: var(--altep-graphite);
  font-weight: 700;
  text-decoration: none;
}

.altep-product__hero {
  display: grid;
  gap: clamp(1.5rem, 4vw, 4.5rem);
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
}

.altep-product__media,
.altep-product__summary,
.altep-variant {
  background: var(--altep-white);
  border: 1px solid var(--altep-line);
  border-radius: var(--altep-radius);
}

.altep-product__media {
  min-width: 0;
  padding: clamp(1rem, 3vw, 2rem);
}

.altep-product__image-stage {
  align-items: center;
  aspect-ratio: 1 / 0.82;
  background: linear-gradient(145deg, #fafbfc, #edf0f3);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  overflow: hidden;
  padding: clamp(1rem, 4vw, 3rem);
}

.altep-product__image-stage img {
  height: 100%;
  object-fit: contain;
  width: 100%;
}

.altep-thumbnails {
  display: flex;
  gap: 0.65rem;
  margin-top: 1rem;
  overflow-x: auto;
  padding: 0.15rem 0 0.5rem;
  scrollbar-width: thin;
}

.altep-thumbnail {
  align-items: center;
  appearance: none;
  background: var(--altep-white);
  border: 1px solid var(--altep-line);
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  flex: 0 0 72px;
  height: 72px;
  justify-content: center;
  overflow: hidden;
  padding: 0.35rem;
}

.altep-thumbnail.is-active {
  border-color: var(--altep-red);
  box-shadow: inset 0 0 0 1px var(--altep-red);
}

.altep-thumbnail img {
  height: 100%;
  object-fit: contain;
  width: 100%;
}

.altep-thumbnail span {
  color: var(--altep-steel);
  font-size: 0.72rem;
  font-weight: 800;
}

.altep-product__summary {
  align-self: start;
  padding: clamp(1.6rem, 4vw, 3.25rem);
  position: sticky;
  top: 1.5rem;
}

.altep-product__summary h1 {
  color: var(--altep-graphite);
  font-size: clamp(2.4rem, 5.5vw, 4.8rem);
  letter-spacing: -0.045em;
  line-height: 0.98;
  margin: 0 0 1.2rem;
}

.altep-product__intro {
  color: var(--altep-muted);
  font-size: 1rem;
  line-height: 1.7;
}

.altep-product__intro p {
  margin: 0 0 1rem;
}

.altep-product__family-sku {
  border-bottom: 1px solid var(--altep-line);
  border-top: 1px solid var(--altep-line);
  color: var(--altep-muted);
  font-size: 0.85rem;
  margin: 1.4rem 0;
  padding: 0.9rem 0;
}

.altep-selector__label {
  color: var(--altep-graphite);
  display: block;
  font-size: 0.84rem;
  font-weight: 800;
  margin: 0 0 0.55rem;
  text-transform: uppercase;
}

.altep-selector {
  appearance: none;
  background:
    linear-gradient(45deg, transparent 50%, var(--altep-graphite) 50%) calc(100% - 20px) 50% / 6px 6px no-repeat,
    linear-gradient(135deg, var(--altep-graphite) 50%, transparent 50%) calc(100% - 14px) 50% / 6px 6px no-repeat,
    var(--altep-white);
  border: 2px solid var(--altep-graphite);
  border-radius: 10px;
  color: var(--altep-graphite);
  cursor: pointer;
  font: inherit;
  font-size: 1.05rem;
  font-weight: 800;
  min-height: 54px;
  padding: 0.75rem 3rem 0.75rem 1rem;
  width: 100%;
}

.altep-variant {
  margin-top: 1.5rem;
  overflow: hidden;
}

.altep-variant__header {
  align-items: center;
  background: var(--altep-graphite);
  color: var(--altep-white);
  display: flex;
  gap: 1.5rem;
  justify-content: space-between;
  padding: clamp(1.5rem, 4vw, 2.5rem);
}

.altep-variant__header h2 {
  color: var(--altep-white);
  font-size: clamp(1.6rem, 3.5vw, 2.8rem);
  line-height: 1.08;
  margin: 0 0 0.7rem;
}

.altep-variant__header p:last-child {
  color: rgba(255, 255, 255, 0.65);
  margin: 0;
}

.altep-button {
  background: var(--altep-red);
  border-radius: 10px;
  color: var(--altep-white) !important;
  display: inline-flex;
  flex: 0 0 auto;
  font-weight: 800;
  justify-content: center;
  min-height: 52px;
  padding: 0.9rem 1.25rem;
  text-align: center;
  text-decoration: none !important;
  transition: background 160ms ease, transform 160ms ease;
}

.altep-button:hover {
  background: var(--altep-red-dark);
  transform: translateY(-1px);
}

.altep-variant__content {
  padding: clamp(1.5rem, 4vw, 3.5rem);
}

.altep-variant__description {
  color: var(--altep-steel);
  line-height: 1.75;
  max-width: 980px;
}

.altep-variant__description h2,
.altep-variant__description h3,
.altep-variant__technical h3 {
  color: var(--altep-graphite);
}

.altep-variant__technical {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(2rem, 5vw, 4rem);
}

.altep-technical-card {
  background: var(--altep-surface);
  border: 1px solid var(--altep-line);
  border-radius: 14px;
  overflow: hidden;
  padding: clamp(1.2rem, 3vw, 2rem);
}

.altep-technical-card--dimensions {
  grid-column: 1 / -1;
}

.altep-variant__technical h3 {
  align-items: center;
  display: flex;
  font-size: 1.25rem;
  gap: 0.75rem;
  margin: 0 0 1.25rem;
}

.altep-variant__technical h3 > span {
  align-items: center;
  background: var(--altep-red);
  border-radius: 999px;
  color: var(--altep-white);
  display: inline-flex;
  flex: 0 0 34px;
  font-size: 0.68rem;
  height: 34px;
  justify-content: center;
  letter-spacing: 0.06em;
}

.altep-spec-list {
  display: grid;
  gap: 0;
  margin: 0;
}

.altep-spec-item {
  align-items: center;
  border-bottom: 1px solid var(--altep-line);
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(150px, 0.8fr) minmax(0, 1.2fr);
  padding: 0.9rem 0;
}

.altep-spec-item:last-child {
  border-bottom: 0;
}

.altep-spec-item dt {
  align-items: center;
  color: var(--altep-muted);
  display: flex;
  font-size: 0.84rem;
  font-weight: 750;
  gap: 0.65rem;
  margin: 0;
}

.altep-spec-item dt span,
.altep-dimension-intro > span {
  background: var(--altep-red);
  border-radius: 50%;
  flex: 0 0 8px;
  height: 8px;
  width: 8px;
}

.altep-spec-item dd {
  color: var(--altep-graphite);
  font-weight: 850;
  margin: 0;
}

.altep-feature-list {
  display: grid;
  gap: 0.65rem 1.5rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  list-style: none;
  margin: 1rem 0 1.5rem;
  padding: 0;
}

.altep-feature-list > li {
  color: var(--altep-graphite);
  font-weight: 700;
  padding-left: 1.25rem;
  position: relative;
}

.altep-feature-list > li::before {
  background: var(--altep-red);
  border-radius: 50%;
  content: "";
  height: 7px;
  left: 0;
  position: absolute;
  top: 0.65em;
  width: 7px;
}

.altep-feature-list__nested {
  grid-column: 1 / -1;
}

.altep-feature-list__nested ul {
  color: var(--altep-steel);
  font-weight: 500;
  list-style: disc;
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
}

.altep-package {
  background: #f5f6f8;
  border-left: 4px solid var(--altep-red);
  border-radius: 0 14px 14px 0;
  margin: 2rem 0;
  padding: clamp(1.2rem, 3vw, 2rem);
}

.altep-package h3 {
  margin-top: 0;
}

.altep-proof {
  color: var(--altep-graphite);
  font-size: 1.05rem;
  font-weight: 800;
}

.altep-dimension-intro {
  align-items: center;
  display: flex;
  gap: 0.75rem;
}

.altep-dimension-intro p {
  color: var(--altep-steel);
  margin: 0;
}

.altep-dimension-details {
  border-top: 1px solid var(--altep-line);
  margin-top: 1.25rem;
  padding-top: 1rem;
}

.altep-dimension-details summary {
  color: var(--altep-red);
  cursor: pointer;
  font-weight: 850;
}

.altep-dimension-details__body {
  color: var(--altep-steel);
  line-height: 1.65;
  margin-top: 1rem;
  max-height: 520px;
  overflow: auto;
  padding-right: 0.5rem;
}

.altep-variant table {
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 0;
  width: 100%;
}

.altep-variant th,
.altep-variant td {
  border-bottom: 1px solid var(--altep-line);
  padding: 0.65rem 0.5rem;
  text-align: left;
  vertical-align: top;
}

.altep-variant th {
  color: var(--altep-graphite);
  font-weight: 800;
}

.altep-noscript {
  background: var(--altep-white);
  border: 1px solid var(--altep-line);
  border-radius: var(--altep-radius);
  margin-top: 1.5rem;
  padding: 1.5rem;
}

@media (max-width: 1024px) {
  .altep-catalog__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .altep-product__hero {
    grid-template-columns: 1fr;
  }

  .altep-variant__technical {
    grid-template-columns: 1fr;
  }

  .altep-technical-card--dimensions {
    grid-column: auto;
  }

  .altep-product__summary {
    position: static;
  }
}

@media (max-width: 680px) {
  .altep-catalog,
  .altep-product {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .altep-catalog__intro {
    border-radius: 18px;
  }

  .altep-catalog__grid {
    grid-template-columns: 1fr;
  }

  .altep-filters {
    flex-wrap: nowrap;
    margin-left: -1rem;
    margin-right: -1rem;
    overflow-x: auto;
    padding: 0 1rem 0.5rem;
  }

  .altep-filter {
    flex: 0 0 auto;
  }

  .altep-product__hero {
    gap: 1rem;
  }

  .altep-product__media,
  .altep-product__summary,
  .altep-variant {
    border-radius: 14px;
  }

  .altep-product__image-stage {
    aspect-ratio: 1 / 0.9;
  }

  .altep-variant__header {
    align-items: stretch;
    flex-direction: column;
  }

  .altep-button {
    width: 100%;
  }

  .altep-feature-list {
    grid-template-columns: 1fr;
  }

  .altep-spec-item {
    align-items: start;
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .altep-card,
  .altep-card__image img,
  .altep-filter,
  .altep-button {
    transition: none;
  }
}