@font-face {
  font-family: "Science Gothic";
  src: url("assets/fonts/ScienceGothic-Variable.ttf") format("truetype-variations");
  font-weight: 100 900;
  font-stretch: 50% 200%;
  font-style: normal;
  font-display: swap;
}

:root {
  --pad: 2.67rem;
  --bg: #0c0c0c;
  --line: rgba(255, 255, 255, 0.42);
  --muted: rgba(255, 255, 255, 0.62);
  --fs-heading: 2.8rem;
  --fs-price: 1.85rem;
  --fs-body: 1.2rem;
  --fs-nav: 0.8rem;
  --font-display: "Science Gothic", "Arial", sans-serif;
  --font-mono: "Science Gothic", "Arial", sans-serif;
  --scene-w: min(100vw, calc(100vh * 16 / 9));
  --scene-left: 0px;
  --frame-inset: 3.333%;
  --frame-inset-n: 0.03333;
}

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

html {
  font-size: clamp(9px, min(1.25vw, 2.2222vh), 26px);
}

body {
  margin: 0;
  background: var(--bg);
  color: #fff;
  font-family: var(--font-mono);
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- Top bar ---------- */

.topbar {
  position: fixed;
  z-index: 20;
  top: 2rem;
  left: calc(var(--scene-left) + var(--scene-w) * var(--frame-inset-n));
  right: var(--pad);
  display: flex;
  align-items: center;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.topbar > * {
  pointer-events: auto;
}

.topbar.no-anim {
  transition: none;
}

.topbar.is-hidden {
  opacity: 0;
  transform: translateY(-0.75rem);
}

.topbar.is-hidden > * {
  pointer-events: none;
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  flex: none;
}

.logo__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.8rem;
  line-height: 1;
  letter-spacing: 0.01em;
}

.logo__rule {
  height: 1px;
  background: #fff;
  margin: 0.35rem 0 0.3rem;
}

.logo__sub {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.38rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--muted);
  white-space: nowrap;
}

.logo__sub i {
  flex: 1;
  height: 1px;
  background: currentColor;
}

.topbar__rule {
  flex: 1;
  height: 1px;
  background: var(--line);
  margin: 0 2.3rem 0 1rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.nav__item {
  display: inline-flex;
  align-items: center;
  height: 2rem;
  padding: 0 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: var(--fs-nav);
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.nav__item:hover {
  border-color: #fff;
}

.nav__item.is-active {
  background: #fff;
  border-color: #fff;
  color: #0c0c0c;
}

.nav__item.is-empty {
  opacity: 0.45;
  cursor: default;
}

.nav__item.is-empty:hover {
  border-color: var(--line);
}

/* ---------- Kit slide ---------- */

.kits {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

.kits__track {
  display: flex;
  height: 100%;
  transition: transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: transform;
  touch-action: pan-y;
}

.kits__track.no-transition,
.kits__track.is-dragging {
  transition: none;
}

.kits__track.is-dragging {
  cursor: grabbing;
  user-select: none;
}

.kit {
  position: relative;
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  overflow: hidden;
  isolation: isolate;
}

/* The scene keeps the photo and the frame in one shared 16:9
   coordinate space, so the frame always hugs the hardware. */
.kit__scene {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.kit__photo {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: var(--scene-w);
  aspect-ratio: 16 / 9;
  container-type: inline-size;
  background-image: var(--photo);
  background-size: 100% 100%;
  background-position: center;
  background-repeat: no-repeat;
}

.kit__photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 22% 55%, rgba(20, 20, 20, 0.15) 0%, rgba(12, 12, 12, 0.55) 60%, rgba(12, 12, 12, 0.9) 100%),
    linear-gradient(90deg, rgba(12, 12, 12, 0) 38%, rgba(12, 12, 12, 0.72) 54%, var(--bg) 66%);
}

/* Decorative viewfinder frame (percentages of the 16:9 photo) */

.kit__frame {
  position: absolute;
  left: var(--frame-inset);
  top: var(--frame-top, 17.87%);
  width: var(--frame-w, 34.792%);
  height: 79.074%;
  pointer-events: none;
}

.kit__frame-top,
.kit__frame-bottom {
  position: absolute;
  left: 0;
  width: 100%;
  height: 6.09%;
}

.kit__frame-top {
  top: 0;
  border-top: 1px solid #fff;
  border-left: 1px solid #fff;
  border-right: 1px solid #fff;
}

.kit__frame-bottom {
  bottom: 0;
  border-bottom: 1px solid #fff;
  border-left: 1px solid #fff;
  border-right: 1px solid #fff;
}

.kit__frame-left {
  position: absolute;
  left: 1.26%;
  top: 14.87%;
  bottom: 18.85%;
  width: 1px;
  background: #fff;
}

.kit__frame-label {
  position: absolute;
  top: 3.28%;
  left: 7%;
  font-size: 1.2cqw;
  letter-spacing: 0.04em;
}

/* Text column */

.kit__content {
  position: absolute;
  top: 0;
  left: calc(var(--scene-left) + var(--scene-w) * 0.5167);
  right: calc(100vw - var(--scene-left) - var(--scene-w) * 0.96667);
  bottom: 0;
  padding: 10.75rem 0 2.67rem;
  display: flex;
  flex-direction: column;
}

.kit__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-heading);
  line-height: 1;
  letter-spacing: 0.01em;
}

.kit__specs {
  list-style: none;
  margin: 3.25rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.kit__spec {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  font-size: var(--fs-body);
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.kit__spec-label {
  display: block;
}

.kit__spec-label small {
  display: block;
  font-size: 1em;
}

.kit__spec-value {
  text-align: right;
  white-space: nowrap;
}

.kit__extra {
  margin: 2.5rem 0 0;
  max-width: 32rem;
  font-size: var(--fs-body);
  line-height: 1.5;
  letter-spacing: 0.02em;
  white-space: pre-line;
}

.kit__extra--italic {
  font-style: italic;
  font-variation-settings: "slnt" -8;
}

.kit__bullets {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: var(--fs-body);
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.kit--bullets .kit__divider {
  margin-top: 2.4rem;
}

.kit__bullets li {
  position: relative;
  padding-left: 1.4em;
}

.kit__bullets li::before {
  content: "·";
  position: absolute;
  left: 0.25em;
}

.kit__footer {
  margin-top: auto;
}

.kit__footer .kit__divider {
  margin-top: 0;
}

.kit__disclaimer {
  margin: 1.4rem 0 0;
  font-size: 0.95rem;
  line-height: 1.55;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.kit__divider {
  height: 1px;
  margin-top: 3.2rem;
  background: var(--line);
}

.kit__price {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  margin-top: 1.55rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-price);
  letter-spacing: 0.01em;
}

.kit__price span:last-child {
  white-space: nowrap;
}

.kit__note {
  margin: auto 0 0;
  padding: 1.2rem 1.1rem;
  background: rgba(255, 255, 255, 0.09);
  font-size: 1rem;
  line-height: 1.35;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* ---------- Slide content transitions ---------- */

.kit__title,
.kit__specs,
.kit__extra,
.kit__bullets,
.kit__divider,
.kit__price,
.kit__note,
.kit__disclaimer,
.kit__footer,
.kit__frame-label {
  transition: opacity 0.45s ease, transform 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.kit__content > * {
  transition-delay: calc(var(--i, 0) * 45ms);
}

.kit__content > *:nth-child(1) { --i: 0; }
.kit__content > *:nth-child(2) { --i: 1; }
.kit__content > *:nth-child(3) { --i: 2; }
.kit__content > *:nth-child(4) { --i: 3; }
.kit__content > *:nth-child(5) { --i: 4; }
.kit__content > *:nth-child(6) { --i: 5; }
.kit__content > *:nth-child(7) { --i: 6; }

.kit:not(.is-active) .kit__title,
.kit:not(.is-active) .kit__specs,
.kit:not(.is-active) .kit__extra,
.kit:not(.is-active) .kit__bullets,
.kit:not(.is-active) .kit__divider,
.kit:not(.is-active) .kit__price,
.kit:not(.is-active) .kit__note,
.kit:not(.is-active) .kit__disclaimer,
.kit:not(.is-active) .kit__footer,
.kit:not(.is-active) .kit__frame-label {
  opacity: 0;
  transform: translateY(1.6rem);
}

.kit:not(.is-active) .kit__content > * {
  transition-delay: 0ms;
}

@media (prefers-reduced-motion: reduce) {
  .kits {
    scroll-behavior: auto;
  }

  .kit__title,
  .kit__specs,
  .kit__extra,
  .kit__bullets,
  .kit__divider,
  .kit__price,
  .kit__note,
  .kit__disclaimer,
  .kit__footer,
  .kit__frame-label {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ---------- Cover slide ---------- */

.kit__photo--cover {
  filter: brightness(0.55) contrast(1.05);
}

.kit__photo--cover::after {
  background:
    radial-gradient(120% 100% at 70% 40%, rgba(12, 12, 12, 0.15) 0%, rgba(12, 12, 12, 0.6) 100%),
    linear-gradient(90deg, rgba(12, 12, 12, 0.5) 0%, rgba(12, 12, 12, 0.1) 45%, rgba(12, 12, 12, 0.55) 100%);
}

.kit__watermark {
  position: absolute;
  left: -0.06em;
  bottom: -0.1em;
  transform: rotate(90deg);
  transform-origin: left bottom;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 11rem;
  line-height: 1;
  letter-spacing: 0.01em;
  color: rgba(255, 255, 255, 0.06);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}

.kit__content--cover {
  left: calc(var(--scene-left) + var(--scene-w) * 0.388);
  padding-top: 5rem;
}

.kit__title--cover {
  font-size: 3.6rem;
  line-height: 1.1;
}

.kit__content--cover .kit__divider {
  margin-top: 5rem;
}

.kit__cover-info {
  margin: 1.6rem 0 0;
  font-size: 0.95rem;
  line-height: 1.65;
  letter-spacing: 0.02em;
}

.kit__cover-info b {
  font-weight: 600;
}

.kit__cover-info u {
  text-underline-offset: 0.22em;
}

/* ---------- Contacts slide ---------- */

.kit--contacts {
  background: radial-gradient(120% 90% at 25% 50%, #171717 0%, var(--bg) 70%);
}

.kit--contacts .kit__watermark {
  opacity: 0.55;
}

.kit__specs--contacts,
.kit--contacts .kit__specs {
  gap: 1.3rem;
}

.kit--contacts .kit__note {
  white-space: normal;
}

/* ---------- Slide pager ---------- */

.pager {
  position: fixed;
  inset: 0;
  z-index: 30;
  pointer-events: none;
}

.pager__btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 2.6rem;
  height: 2.6rem;
  display: grid;
  place-items: center;
  padding: 0;
  color: #fff;
  background: rgba(12, 12, 12, 0.45);
  border: 1px solid var(--line);
  border-radius: 50%;
  cursor: pointer;
  pointer-events: auto;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.pager__btn--prev {
  left: 0.8rem;
}

.pager__btn--next {
  right: 0.8rem;
}

.pager__btn:hover {
  background: #fff;
  border-color: #fff;
  color: #0c0c0c;
}

.pager__btn:disabled {
  opacity: 0.3;
  cursor: default;
  pointer-events: none;
}

.pager__count {
  position: absolute;
  left: calc(var(--scene-left) + var(--scene-w) / 2);
  bottom: 1.5rem;
  transform: translateX(-50%);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.pager__count i {
  font-style: normal;
  margin: 0 0.4em;
  opacity: 0.5;
}

.pager__count b {
  color: #fff;
}

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

@media (max-width: 900px), (max-aspect-ratio: 5/6) {
  html {
    font-size: 16px;
  }

  .topbar {
    top: 0;
    left: 0;
    right: 0;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1rem 1.25rem 0.9rem;
    background: linear-gradient(180deg, var(--bg) 72%, rgba(12, 12, 12, 0));
  }

  .logo__name {
    font-size: 1.5rem;
  }

  .logo__sub {
    font-size: 0.36rem;
    letter-spacing: 0.22em;
  }

  .topbar__rule {
    display: none;
  }

  .nav {
    order: 3;
    width: 100%;
    margin-top: 0.25rem;
    gap: 0.5rem;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.25rem;
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .nav__item {
    flex: 0 0 auto;
    height: 2.1rem;
    padding: 0 1rem;
    font-size: 0.82rem;
  }

  .kits {
    display: block;
    height: auto;
    overflow: visible;
  }

  .kits__track {
    display: block;
    height: auto;
    transform: none !important;
    transition: none;
  }

  .pager {
    display: none;
  }

  .kit {
    flex: none;
    width: 100%;
    height: auto;
    min-height: auto;
    scroll-snap-align: none;
    padding: 8rem 1.25rem 2.5rem;
  }

  .kit__scene {
    position: static;
    overflow: visible;
  }

  /* Full-width product hero: zoomed in on the hardware and brightened. */
  .kit__photo {
    position: relative;
    left: auto;
    top: auto;
    transform: none;
    width: 100%;
    aspect-ratio: 4 / 3;
    margin-bottom: 1.75rem;
    background-image: none;
    border: 1px solid rgba(255, 255, 255, 0.14);
  }

  .kit__photo::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: var(--photo);
    background-size: cover;
    background-position: 34% 44%;
    filter: brightness(1.55) contrast(1.05);
  }

  .kit__photo::after {
    background: linear-gradient(180deg, rgba(12, 12, 12, 0) 55%, rgba(12, 12, 12, 0.8) 100%);
  }

  .kit__frame {
    display: none;
  }

  .kit__content {
    position: static;
    padding: 0;
  }

  .kit__title {
    font-size: 1.9rem;
  }

  .kit__specs {
    margin-top: 1.5rem;
    gap: 0.5rem;
  }

  .kit__spec {
    font-size: 1rem;
  }

  .kit__extra {
    margin-top: 1.75rem;
    max-width: none;
    font-size: 1rem;
  }

  .kit__divider,
  .kit--bullets .kit__divider {
    margin-top: 1.75rem;
  }

  .kit__price {
    margin-top: 1.25rem;
    font-size: 1.4rem;
  }

  .kit__note {
    margin-top: 1.75rem;
    padding: 1rem 1.1rem;
    font-size: 0.95rem;
    white-space: normal;
  }

  .kit__bullets {
    margin-top: 1.75rem;
    font-size: 1rem;
  }

  .kit__footer {
    margin-top: 1.75rem;
  }

  .kit__disclaimer {
    font-size: 0.9rem;
  }

  .kit__photo--cover {
    aspect-ratio: 16 / 9;
  }

  .kit__photo--cover::before {
    background-position: center;
  }

  .kit__content--cover {
    position: static;
    padding: 0;
  }

  .kit__title--cover {
    font-size: 1.6rem;
  }

  .topbar.is-hidden {
    opacity: 1;
    transform: none;
  }

  .topbar.is-hidden > * {
    pointer-events: auto;
  }

  .kit__content--cover .kit__divider {
    margin-top: 2rem;
  }

  .kit__cover-info {
    font-size: 0.95rem;
  }

  .kit__watermark {
    display: none;
  }

  .kit__title,
  .kit__specs,
  .kit__extra,
  .kit__bullets,
  .kit__divider,
  .kit__price,
  .kit__note,
  .kit__disclaimer,
  .kit__footer,
  .kit__frame-label {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}