:root {
  --bg: #080a0a;
  --bg-deep: #050606;
  --ink: #111516;
  --text: #f8f5ef;
  --muted: rgba(248, 245, 239, 0.66);
  --line: rgba(255, 255, 255, 0.14);
  --panel: rgba(255, 255, 255, 0.08);
  --red: #dc4b36;
  --steel: #c9d2d0;
  --paper: #f8f8f5;
  --paper-2: #ecefec;
  --page-progress: 0;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  overflow-x: clip;
  scroll-behavior: smooth;
  scroll-snap-type: y mandatory;
  background: var(--bg);
}

html.is-screen-jumping {
  scroll-behavior: auto;
  scroll-snap-type: none;
}

html.is-free-scroll-screen:not(.is-screen-jumping) {
  scroll-snap-type: none;
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  background: var(--bg);
}

body::before,
body::after {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 65;
  pointer-events: none;
  content: "";
  opacity: 0;
}

body::before {
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--red), rgba(255, 255, 255, 0.86), transparent);
  transform: scaleX(var(--page-progress));
  transform-origin: left center;
  transition: opacity 0.18s ease;
}

body::after {
  top: -18vh;
  height: 38vh;
  background:
    linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.08), rgba(220, 75, 54, 0.1), transparent);
  filter: blur(18px);
  transform: translate3d(0, -20%, 0);
}

body.is-paging::before {
  opacity: 1;
}

body.is-paging::after {
  opacity: 1;
  animation: pageLightSweep 0.86s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

body.is-paging.paging-up::after {
  animation-name: pageLightSweepUp;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

.premium-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 28px;
  min-height: 72px;
  padding: 14px clamp(18px, 4vw, 72px);
  background: linear-gradient(180deg, rgba(6, 7, 7, 0.86), rgba(6, 7, 7, 0.38));
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px);
}

.premium-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.premium-brand span {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: #fff;
  background: var(--red);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 900;
}

.premium-brand strong {
  overflow: hidden;
  font-size: 15px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.premium-nav nav {
  display: flex;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
}

.premium-nav a {
  transition: color 0.22s ease, background 0.22s ease, border-color 0.22s ease;
}

.premium-nav a:hover {
  color: #fff;
}

.premium-nav nav a.active {
  color: #fff;
}

.premium-nav nav a.active::after {
  display: block;
  width: 100%;
  height: 2px;
  margin-top: 7px;
  content: "";
  background: var(--red);
  border-radius: 99px;
}

.nav-action,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 900;
  cursor: pointer;
}

.button.primary,
.nav-action {
  color: #fff;
  background: var(--red);
  border-color: rgba(220, 75, 54, 0.72);
}

.button.secondary {
  color: #fff;
  background: rgba(255, 255, 255, 0.075);
}

.section-rail {
  --rail-progress: 0%;
  position: fixed;
  top: 50%;
  right: clamp(12px, 2vw, 28px);
  z-index: 55;
  display: grid;
  gap: 10px;
  width: 156px;
  padding-right: 18px;
  transform: translateY(-50%);
}

.section-rail::before,
.section-rail::after {
  position: absolute;
  right: 4px;
  top: 17px;
  content: "";
  border-radius: 99px;
}

.section-rail::before {
  bottom: 17px;
  width: 1px;
  background: rgba(255, 255, 255, 0.2);
}

.section-rail::after {
  width: 3px;
  height: var(--rail-progress);
  max-height: calc(100% - 34px);
  background: var(--red);
  box-shadow: 0 0 18px rgba(220, 75, 54, 0.34);
  transition: height 0.46s cubic-bezier(0.2, 0.7, 0.22, 1);
}

.section-rail button {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  width: 100%;
  height: 34px;
  padding: 0;
  color: rgba(255, 255, 255, 0.54);
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: right;
}

.section-rail button::before {
  position: absolute;
  top: 50%;
  right: -18px;
  width: 8px;
  height: 8px;
  content: "";
  background: rgba(255, 255, 255, 0.42);
  border-radius: 999px;
  transform: translateY(-50%);
  transition: width 0.26s ease, background 0.26s ease, box-shadow 0.26s ease;
}

.section-rail button:focus-visible {
  outline: 0;
}

.section-rail button:focus-visible::before {
  box-shadow: 0 0 0 5px rgba(220, 75, 54, 0.22);
}

.rail-index {
  min-width: 24px;
  color: currentColor;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.rail-label {
  max-width: 0;
  overflow: hidden;
  font-size: 12px;
  font-weight: 900;
  opacity: 0;
  white-space: nowrap;
  transform: translateX(8px);
  transition: max-width 0.28s ease, opacity 0.24s ease, transform 0.24s ease;
}

.section-rail button.active::before,
.section-rail button:hover::before,
.section-rail button:focus-visible::before {
  width: 26px;
  background: var(--red);
}

.section-rail button.active,
.section-rail button:hover,
.section-rail button:focus-visible {
  color: #fff;
}

.section-rail button.active .rail-label,
.section-rail button:hover .rail-label,
.section-rail button:focus-visible .rail-label {
  max-width: 92px;
  opacity: 1;
  transform: translateX(0);
}

body.is-light-screen .section-rail button::before {
  background: rgba(17, 21, 22, 0.32);
}

body.is-light-screen .section-rail::before {
  background: rgba(17, 21, 22, 0.16);
}

body.is-light-screen .section-rail button {
  color: rgba(17, 21, 22, 0.52);
}

body.is-light-screen .section-rail button.active,
body.is-light-screen .section-rail button:hover,
body.is-light-screen .section-rail button:focus-visible {
  color: var(--ink);
}

body.is-light-screen .section-rail button.active::before,
body.is-light-screen .section-rail button:hover::before,
body.is-light-screen .section-rail button:focus-visible::before {
  background: var(--red);
}

.premium-root {
  min-height: 100vh;
}

.premium-screen {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 100vh;
  padding: 104px clamp(18px, 4vw, 72px) 54px;
  overflow: hidden;
  isolation: isolate;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  transform: translateZ(0);
  transition: filter 0.64s ease, opacity 0.64s ease, transform 0.64s cubic-bezier(0.2, 0.7, 0.22, 1);
  will-change: filter, opacity, transform;
}

body.is-paging .premium-screen {
  filter: saturate(0.88) brightness(0.82);
  opacity: 0.62;
  transform: translate3d(0, 0, 0) scale(0.985);
}

body.is-paging .premium-screen.is-active {
  filter: saturate(1) brightness(1);
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
}

.premium-screen::before {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 128px 128px;
  opacity: 0;
  transform: scale(1.03);
  transition: opacity 0.72s ease, transform 0.86s ease;
  mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
}

.premium-screen::after {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  content: "";
  opacity: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(220, 75, 54, 0.07) 52%, transparent 100%);
  transform: translateY(22px);
  transition: opacity 0.72s ease, transform 0.92s ease;
}

.premium-screen.is-active::before {
  opacity: 0.15;
  transform: scale(1);
}

.premium-screen.is-active::after {
  opacity: 1;
  transform: translateY(0);
}

.hero-grid,
.screen-head,
.category-wall,
.capability-grid,
.premium-products,
.rfq-layout,
.hero-strip {
  position: relative;
  z-index: 2;
  width: min(1680px, 100%);
  min-width: 0;
  margin: 0 auto;
}

.premium-hero {
  background:
    radial-gradient(circle at 75% 48%, rgba(220, 75, 54, 0.16), transparent 33%),
    linear-gradient(135deg, #050606 0%, #0b0d0d 46%, #161a18 100%);
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero-video,
.hero-texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-video {
  z-index: 2;
}

.hero-texture {
  filter: grayscale(1) contrast(1.08) brightness(0.38);
  opacity: 0.28;
}

.hero-shade {
  position: absolute;
  inset: 0;
  z-index: 3;
  background:
    linear-gradient(90deg, rgba(5, 6, 6, 0.98) 0%, rgba(5, 6, 6, 0.82) 40%, rgba(5, 6, 6, 0.22) 74%, rgba(5, 6, 6, 0.72) 100%),
    linear-gradient(180deg, rgba(5, 6, 6, 0.28), rgba(5, 6, 6, 0.78));
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(360px, 0.58fr) minmax(560px, 0.92fr);
  align-items: center;
  gap: clamp(28px, 6vw, 110px);
}

.hero-copy,
.hero-studio,
.screen-head,
.category-wall,
.capability-grid,
.premium-products,
.rfq-layout {
  opacity: 0;
  transform: translate3d(0, 28px, 0);
  transition: opacity 0.74s ease, transform 0.74s ease;
}

.premium-screen.is-active .hero-copy,
.premium-screen.is-active .hero-studio,
.premium-screen.is-active .screen-head,
.premium-screen.is-active .category-wall,
.premium-screen.is-active .capability-grid,
.premium-screen.is-active .premium-products,
.premium-screen.is-active .rfq-layout {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

body.is-paging.paging-down .premium-screen.is-active .hero-copy,
body.is-paging.paging-down .premium-screen.is-active .hero-studio,
body.is-paging.paging-down .premium-screen.is-active .screen-head,
body.is-paging.paging-down .premium-screen.is-active .category-wall,
body.is-paging.paging-down .premium-screen.is-active .capability-grid,
body.is-paging.paging-down .premium-screen.is-active .premium-products,
body.is-paging.paging-down .premium-screen.is-active .rfq-layout {
  animation: pageEnterUp 0.78s cubic-bezier(0.2, 0.7, 0.22, 1) both;
}

body.is-paging.paging-up .premium-screen.is-active .hero-copy,
body.is-paging.paging-up .premium-screen.is-active .hero-studio,
body.is-paging.paging-up .premium-screen.is-active .screen-head,
body.is-paging.paging-up .premium-screen.is-active .category-wall,
body.is-paging.paging-up .premium-screen.is-active .capability-grid,
body.is-paging.paging-up .premium-screen.is-active .premium-products,
body.is-paging.paging-up .premium-screen.is-active .rfq-layout {
  animation: pageEnterDown 0.78s cubic-bezier(0.2, 0.7, 0.22, 1) both;
}

.hero-studio {
  transition-delay: 0.08s;
}

.kicker {
  margin: 0 0 22px;
  color: var(--steel);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.16em;
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(54px, 6.2vw, 104px);
  line-height: 0.98;
  overflow-wrap: anywhere;
  word-break: break-word;
}

h2 {
  margin: 0;
  font-size: clamp(36px, 4.4vw, 72px);
  line-height: 1.05;
}

.premium-screen:not(.premium-hero) h2 {
  font-size: clamp(34px, 3.5vw, 58px);
}

.hero-lead,
.screen-head p,
.rfq-layout > div p {
  max-width: 660px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.82;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.hero-studio {
  display: grid;
  gap: 18px;
  justify-items: end;
}

.hero-model-stage {
  position: relative;
  width: min(900px, 100%);
  aspect-ratio: 1.44;
  overflow: hidden;
  background:
    radial-gradient(circle at 74% 49%, rgba(220, 75, 54, 0.18), transparent 28%),
    radial-gradient(circle at 58% 55%, rgba(238, 247, 243, 0.17), transparent 37%),
    linear-gradient(150deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0));
  border: 0;
  border-radius: 0;
  box-shadow: none;
  backdrop-filter: none;
}

.hero-model-stage::before {
  position: absolute;
  inset: 10px;
  z-index: 5;
  content: "";
  pointer-events: none;
  background:
    linear-gradient(rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.22)) left top / 104px 1px no-repeat,
    linear-gradient(rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.22)) right top / 104px 1px no-repeat,
    linear-gradient(rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.22)) left bottom / 104px 1px no-repeat,
    linear-gradient(rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.22)) right bottom / 104px 1px no-repeat,
    linear-gradient(rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.22)) left top / 1px 72px no-repeat,
    linear-gradient(rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.22)) right top / 1px 72px no-repeat,
    linear-gradient(rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.22)) left bottom / 1px 72px no-repeat,
    linear-gradient(rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.22)) right bottom / 1px 72px no-repeat;
  opacity: 0.72;
}

.hero-model-stage::after {
  position: absolute;
  right: 4%;
  bottom: 6%;
  left: 37%;
  z-index: 1;
  height: 21%;
  content: "";
  background: radial-gradient(ellipse, rgba(0, 0, 0, 0.48), transparent 70%);
  filter: blur(20px);
}

.flying-story,
.automotive-story {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.flying-stage {
  perspective: 1100px;
  cursor: grab;
  background:
    radial-gradient(circle at 70% 48%, rgba(220, 75, 54, 0.16), transparent 27%),
    radial-gradient(circle at 52% 45%, rgba(239, 244, 240, 0.14), transparent 40%),
    linear-gradient(150deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0));
}

.flying-stage:active {
  cursor: grabbing;
}

.flight-depth {
  position: absolute;
  inset: 0;
  opacity: 0.38;
  background:
    radial-gradient(circle at 58% 47%, rgba(255, 255, 255, 0.12), transparent 42%),
    linear-gradient(115deg, transparent 0 46%, rgba(255, 255, 255, 0.12) 46.18%, transparent 46.36% 100%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.045) 0 1px, transparent 1px 90px);
  mask-image: radial-gradient(circle at 58% 52%, #000 0 54%, transparent 82%);
}

.flight-vehicle {
  position: absolute;
  inset: -18% -8% -20% -6%;
  z-index: 2;
  transform:
    translate3d(var(--drift-x, 0px), var(--drift-y, 0px), 0)
    rotateX(var(--tilt-y, 0deg))
    rotateY(var(--tilt-x, 0deg));
  transform-style: preserve-3d;
  transform-origin: 56% 55%;
  filter: drop-shadow(0 44px 44px rgba(0, 0, 0, 0.34));
  animation: flightFocus 14s cubic-bezier(0.65, 0, 0.2, 1) infinite, flightHover 4.8s ease-in-out infinite;
  will-change: transform;
}

.flight-car {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 53%;
  user-select: none;
  pointer-events: none;
}

.flight-car-shell {
  z-index: 1;
  opacity: 0.98;
  filter: saturate(0.88) contrast(1.06) brightness(0.92);
  animation: shellFade 14s ease-in-out infinite;
}

.flight-car-xray {
  z-index: 2;
  opacity: 0;
  filter: saturate(0.86) contrast(1.08) brightness(0.82);
  mix-blend-mode: screen;
  animation: xrayReveal 14s ease-in-out infinite;
}

.flight-scan {
  position: absolute;
  top: 12%;
  bottom: 11%;
  left: 10%;
  z-index: 4;
  width: 2px;
  opacity: 0;
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.8), transparent);
  box-shadow: 0 0 30px rgba(220, 75, 54, 0.62), 0 0 90px rgba(220, 75, 54, 0.22);
  animation: flightScan 14s ease-in-out infinite;
}

.propeller {
  position: absolute;
  z-index: 5;
  width: clamp(74px, 13vw, 152px);
  aspect-ratio: 5.8;
  pointer-events: none;
  opacity: 0.86;
  transform: translate(-50%, -50%) rotate(var(--prop-angle, 0deg));
  transform-origin: center;
  animation: propellerSpin var(--prop-duration, 0.18s) linear infinite;
  filter: blur(0.8px) drop-shadow(0 0 8px rgba(255, 255, 255, 0.18));
}

.propeller::before,
.propeller::after {
  position: absolute;
  inset: 35% 0;
  content: "";
  background: linear-gradient(90deg, transparent, rgba(9, 11, 11, 0.9) 12%, rgba(255, 255, 255, 0.24) 50%, rgba(9, 11, 11, 0.9) 88%, transparent);
  border-radius: 999px;
}

.propeller::after {
  transform: rotate(90deg);
  opacity: 0.58;
}

.propeller-a {
  top: 33%;
  left: 12%;
  --prop-angle: -2deg;
}

.propeller-b {
  top: 25%;
  left: 54%;
  --prop-angle: 1deg;
}

.propeller-c {
  top: 32%;
  left: 87%;
  --prop-angle: -6deg;
}

.propeller-d {
  top: 55%;
  left: 77%;
  --prop-angle: 6deg;
}

.flying-stage.is-boosting .propeller {
  --prop-duration: 0.105s;
  opacity: 0.96;
}

.story-depth {
  position: absolute;
  inset: 0;
  opacity: 0.42;
  background:
    linear-gradient(115deg, transparent 0 40%, rgba(255, 255, 255, 0.13) 40.15%, transparent 40.3% 100%),
    linear-gradient(65deg, transparent 0 52%, rgba(255, 255, 255, 0.08) 52.2%, transparent 52.38% 100%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.055) 0 1px, transparent 1px 86px);
  mask-image: radial-gradient(circle at 63% 55%, #000 0 44%, transparent 76%);
}

.chassis-viewer {
  position: absolute;
  inset: -6% -2% 10% -4%;
  z-index: 2;
  filter: drop-shadow(0 42px 42px rgba(0, 0, 0, 0.42));
  opacity: 0.96;
  transform-origin: 58% 54%;
  animation: chassisFocus 14s cubic-bezier(0.65, 0, 0.2, 1) infinite;
}

.mount-reticle {
  position: absolute;
  left: 76%;
  top: 55%;
  z-index: 4;
  width: 104px;
  height: 104px;
  border: 1px solid rgba(220, 75, 54, 0.62);
  border-radius: 50%;
  opacity: 0;
  box-shadow: 0 0 38px rgba(220, 75, 54, 0.32), inset 0 0 22px rgba(220, 75, 54, 0.22);
  transform: translate(-50%, -50%) scale(0.7);
  animation: mountReticle 14s ease-in-out infinite;
}

.mount-reticle::before,
.mount-reticle::after {
  position: absolute;
  content: "";
  background: rgba(255, 238, 232, 0.82);
}

.mount-reticle::before {
  top: 50%;
  left: 16%;
  width: 72%;
  height: 1px;
}

.mount-reticle::after {
  top: 16%;
  left: 50%;
  width: 1px;
  height: 72%;
}

.zoom-beam {
  position: absolute;
  top: 55%;
  left: 76%;
  z-index: 3;
  width: 31%;
  height: 3px;
  opacity: 0;
  background: linear-gradient(90deg, rgba(220, 75, 54, 0), rgba(220, 75, 54, 0.95), rgba(255, 255, 255, 0.82));
  box-shadow: 0 0 24px rgba(220, 75, 54, 0.46);
  transform: rotate(-10deg) scaleX(0.15);
  transform-origin: left center;
  animation: zoomBeam 14s ease-in-out infinite;
}

.zoom-beam::after {
  position: absolute;
  right: -10px;
  top: 50%;
  width: 16px;
  height: 16px;
  content: "";
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 0 28px rgba(220, 75, 54, 0.85);
  transform: translateY(-50%);
}

.sheet-cutaway {
  position: absolute;
  right: 12%;
  bottom: 12%;
  z-index: 3;
  width: 43%;
  height: 21%;
  opacity: 0;
  transform: translate3d(10%, 8%, 0) rotate(-4deg) scale(0.82);
  animation: sheetReveal 14s ease-in-out infinite;
}

.sheet-plane {
  position: absolute;
  inset: 28% 0 18%;
  background:
    radial-gradient(circle at 68% 50%, rgba(5, 6, 6, 0.72) 0 10%, transparent 10.4%),
    linear-gradient(90deg, rgba(250, 252, 249, 0.86), rgba(183, 198, 195, 0.6), rgba(255, 255, 255, 0.78));
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 5px;
  box-shadow: inset 0 0 22px rgba(255, 255, 255, 0.22), 0 18px 38px rgba(0, 0, 0, 0.32);
  transform: skewX(-14deg);
}

.sheet-hole {
  position: absolute;
  top: 41%;
  left: 64%;
  width: 18%;
  aspect-ratio: 1;
  border: 2px solid rgba(255, 245, 242, 0.92);
  border-radius: 50%;
  box-shadow: 0 0 22px rgba(220, 75, 54, 0.42);
  transform: translate(-50%, -50%) skewX(-14deg);
}

.sheet-label {
  position: absolute;
  left: 4%;
  bottom: 1%;
  color: rgba(255, 255, 255, 0.62);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.story-step {
  position: absolute;
  z-index: 4;
  min-height: 24px;
  padding: 5px 9px;
  color: rgba(255, 255, 255, 0.76);
  background: rgba(5, 6, 6, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 5px;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
  backdrop-filter: blur(10px);
}

.step-a {
  top: 10%;
  left: 7%;
  animation: stepA 14s ease-in-out infinite;
}

.step-b {
  left: 23%;
  bottom: 17%;
  opacity: 0;
  animation: stepB 14s ease-in-out infinite;
}

.step-c {
  right: 5%;
  top: 13%;
  opacity: 0;
  animation: stepC 14s ease-in-out infinite;
}

.nut-closeup {
  position: absolute;
  top: 7%;
  right: -1%;
  z-index: 4;
  width: 43%;
  aspect-ratio: 1;
  opacity: 0;
  transform: translate3d(16%, 4%, 0) scale(0.62);
  animation: nutReveal 14s cubic-bezier(0.65, 0, 0.2, 1) infinite;
}

.hero-nut-viewer {
  position: absolute;
  inset: -4% -3% -3%;
  z-index: 2;
  width: auto;
  height: auto;
  filter: drop-shadow(0 34px 38px rgba(0, 0, 0, 0.34));
}

.model-tag {
  position: absolute;
  z-index: 6;
  min-height: 26px;
  padding: 5px 10px;
  color: rgba(255, 255, 255, 0.84);
  background: rgba(7, 8, 8, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 5px;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
  backdrop-filter: blur(8px);
}

.tag-a {
  top: 17%;
  right: 6%;
}

.tag-b {
  right: 6%;
  bottom: 11%;
}

.studio-watermark {
  position: absolute;
  right: 22px;
  bottom: 18px;
  z-index: 6;
  color: rgba(255, 255, 255, 0.2);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.studio-caption {
  display: grid;
  gap: 8px;
  width: min(700px, 100%);
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

.studio-caption strong {
  color: #fff;
  font-size: clamp(18px, 2vw, 28px);
}

.hero-strip {
  position: absolute;
  right: clamp(18px, 4vw, 72px);
  bottom: 34px;
  left: clamp(18px, 4vw, 72px);
  width: auto;
  display: flex;
  justify-content: center;
  gap: clamp(14px, 4vw, 56px);
  color: rgba(255, 255, 255, 0.48);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.scroll-cue {
  position: absolute;
  left: clamp(18px, 4vw, 72px);
  bottom: 34px;
  z-index: 4;
  width: 92px;
  height: 34px;
}

.scroll-cue::before {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  content: "";
  background: rgba(255, 255, 255, 0.42);
}

.scroll-cue span {
  position: absolute;
  top: 50%;
  left: 0;
  width: 22px;
  height: 3px;
  background: #fff;
  border-radius: 99px;
  transform: translateY(-50%);
  animation: scrollCue 1.8s ease-in-out infinite;
}

.catalog-screen {
  background:
    radial-gradient(circle at 82% 18%, rgba(220, 75, 54, 0.13), transparent 28%),
    linear-gradient(135deg, #0a0c0d, #131717 58%, #080909);
}

.catalog-screen,
.capability-screen,
.rfq-screen {
  align-content: center;
  padding-top: clamp(76px, 8.2vh, 92px);
  padding-bottom: clamp(22px, 3vh, 34px);
}

.catalog-screen,
.capability-screen {
  row-gap: clamp(18px, 2.4vh, 28px);
}

.screen-head {
  max-width: 980px;
  margin-bottom: clamp(18px, 2.4vh, 28px);
}

.catalog-screen .screen-head {
  display: grid;
  grid-template-columns: minmax(420px, 0.72fr) minmax(360px, 0.52fr);
  align-items: end;
  gap: clamp(20px, 4.2vw, 72px);
  max-width: 1680px;
  margin-bottom: 0;
}

.catalog-screen .screen-head .kicker {
  grid-column: 1 / -1;
  margin-bottom: 8px;
}

.catalog-screen h2 {
  max-width: 850px;
  font-size: clamp(34px, 3.05vw, 52px);
}

.catalog-screen .screen-head p {
  margin-top: 0;
  max-width: 560px;
  font-size: clamp(15px, 1.02vw, 17px);
  line-height: 1.62;
}

.screen-head.wide {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  max-width: 1680px;
}

.category-wall {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(10px, 1vw, 14px);
}

.category-card {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  min-height: clamp(208px, 24vh, 246px);
  padding: clamp(16px, 1.65vw, 22px);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.095), rgba(255, 255, 255, 0.045));
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(10px);
  transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}

.category-card:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.06));
  border-color: rgba(255, 255, 255, 0.22);
  transform: translateY(-4px);
}

.category-card b {
  color: var(--red);
  font-size: 12px;
}

.category-card h3 {
  margin: 12px 0 10px;
  font-size: clamp(20px, 1.42vw, 24px);
  line-height: 1.18;
}

.category-card ul {
  display: grid;
  gap: 5px;
  margin: 0;
  padding: 0;
  color: var(--muted);
  font-size: clamp(13px, 0.9vw, 14px);
  list-style: none;
}

.category-card li {
  line-height: 1.27;
}

.category-card button {
  align-self: end;
  width: 100%;
  min-height: 38px;
  margin-top: 12px;
  color: #fff;
  background: rgba(5, 6, 6, 0.66);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.24s ease, border-color 0.24s ease, transform 0.24s ease;
}

.category-card button:hover {
  background: var(--red);
  border-color: rgba(220, 75, 54, 0.78);
  transform: translateY(-2px);
}

.capability-screen {
  background:
    radial-gradient(circle at 78% 24%, rgba(220, 75, 54, 0.13), transparent 26%),
    radial-gradient(circle at 18% 76%, rgba(211, 220, 217, 0.08), transparent 32%),
    linear-gradient(135deg, #070808 0%, #101313 52%, #070909 100%);
}

.capability-screen::before {
  opacity: 0.12;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 180px 180px;
  mask-image: radial-gradient(circle at 50% 50%, #000 0 52%, transparent 82%);
}

.capability-screen::after {
  opacity: 1;
  background: radial-gradient(ellipse at 78% 48%, rgba(220, 75, 54, 0.08), transparent 42%);
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(10px, 1vw, 14px);
}

.capability-screen .screen-head {
  margin-bottom: 0;
}

.capability-grid article {
  display: grid;
  align-content: start;
  min-height: clamp(164px, 20vh, 210px);
  padding: clamp(18px, 1.8vw, 26px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.072), rgba(255, 255, 255, 0.028)),
    rgba(5, 6, 6, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 12px;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(12px);
}

.capability-grid b {
  color: var(--red);
}

.capability-grid h3 {
  margin: 16px 0 10px;
  font-size: clamp(21px, 1.6vw, 26px);
  line-height: 1.16;
}

.capability-grid p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(14px, 0.98vw, 16px);
  line-height: 1.62;
}

.products-screen {
  align-items: start;
  min-height: 100vh;
  padding-top: clamp(80px, 8.6vh, 92px);
  padding-bottom: 44px;
  color: var(--ink);
  background:
    radial-gradient(circle at 14% 12%, rgba(220, 75, 54, 0.08), transparent 25%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
  overflow: visible;
}

.products-screen::before {
  background:
    linear-gradient(90deg, rgba(17, 21, 22, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(17, 21, 22, 0.04) 1px, transparent 1px);
}

.products-screen::after {
  display: none;
}

.premium-screen[data-free-scroll="true"] {
  min-height: 100vh;
  scroll-snap-align: start;
  scroll-snap-stop: normal;
}

.premium-screen[data-free-scroll="true"] .screen-head,
.premium-screen[data-free-scroll="true"] .premium-products {
  opacity: 1;
  transform: none;
}

.products-screen .kicker {
  color: #9c3528;
}

.products-screen .screen-head p {
  color: #60676b;
}

.filter-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.filter-line button {
  min-height: 38px;
  padding: 0 13px;
  color: #333;
  background: #fff;
  border: 1px solid #d8dcde;
  border-radius: 999px;
  cursor: pointer;
}

.filter-line button.active {
  color: #fff;
  background: var(--ink);
  border-color: var(--ink);
}

.premium-products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

.premium-product {
  display: grid;
  grid-template-rows: clamp(150px, 18vh, 190px) 1fr;
  min-height: 390px;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(23, 28, 30, 0.12);
  border-radius: 12px;
  box-shadow: 0 18px 48px rgba(29, 37, 40, 0.1);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}

.premium-product:hover {
  transform: translateY(-5px);
  box-shadow: 0 26px 70px rgba(29, 37, 40, 0.17);
}

.premium-product figure {
  position: relative;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 18px;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 72%, rgba(18, 24, 28, 0.09), transparent 34%),
    linear-gradient(180deg, #fff 0%, #f8f9f8 100%);
  border-bottom: 1px solid #e8ebec;
}

.premium-product figure::after {
  position: absolute;
  inset: 12px;
  pointer-events: none;
  content: "";
  border: 1px solid rgba(17, 21, 22, 0.06);
  border-radius: 9px;
}

.premium-product img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 20px 22px rgba(24, 28, 30, 0.12));
  transform: translateY(-8%) scale(1.12);
}

.product-copy {
  display: grid;
  align-content: start;
  grid-template-rows: auto auto minmax(48px, auto) auto 1fr auto;
  gap: 9px;
  padding: 17px;
}

.product-copy small {
  color: #9a3428;
  font-weight: 900;
  line-height: 1.35;
}

.product-copy h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.22;
}

.product-copy p {
  display: -webkit-box;
  min-height: 52px;
  margin: 0;
  overflow: hidden;
  color: #5d666c;
  font-size: 14px;
  line-height: 1.38;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.product-meta {
  display: grid;
  gap: 4px;
  margin-top: 4px;
  color: #31383b;
  font-size: 13px;
}

.product-meta span {
  overflow-wrap: anywhere;
}

.product-copy button {
  align-self: end;
  min-height: 42px;
  margin-top: 8px;
  color: #fff;
  background: var(--ink);
  border: 0;
  border-radius: 999px;
  cursor: pointer;
}

.rfq-screen {
  background:
    radial-gradient(circle at 82% 20%, rgba(220, 75, 54, 0.12), transparent 28%),
    linear-gradient(135deg, #080a0a 0%, #111515 100%);
}

.rfq-layout {
  display: grid;
  grid-template-columns: minmax(360px, 0.82fr) minmax(420px, 0.58fr);
  gap: clamp(26px, 5vw, 82px);
  align-items: center;
}

.rfq-layout > div p {
  max-width: 560px;
  font-size: clamp(16px, 1.08vw, 18px);
  line-height: 1.68;
}

.rfq-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 11px;
  padding: clamp(16px, 1.5vw, 20px);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(16px);
}

.rfq-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.rfq-form .full {
  grid-column: 1 / -1;
}

.rfq-form input,
.rfq-form textarea,
.rfq-form select {
  width: 100%;
  color: #fff;
  background: rgba(0, 0, 0, 0.24);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 11px;
}

.rfq-form textarea {
  min-height: 92px;
  resize: vertical;
}

.rfq-form select option {
  color: #111;
}

.form-message {
  grid-column: 1 / -1;
  min-height: 22px;
  margin: 0;
  color: var(--steel);
}

.form-message.error {
  color: #ffb2a5;
}

.product-dialog {
  width: min(1040px, calc(100vw - 28px));
  max-height: min(780px, calc(100vh - 28px));
  padding: 0;
  color: var(--ink);
  background: #fff;
  border: 0;
  border-radius: 14px;
}

.product-dialog::backdrop {
  background: rgba(0, 0, 0, 0.72);
}

.dialog-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  width: 40px;
  height: 40px;
  color: #111;
  background: #f2f2ef;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
}

.dialog-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
}

.dialog-media {
  display: grid;
  gap: 14px;
  align-content: start;
  padding: 28px;
  background: radial-gradient(circle at 50% 38%, #fff 0%, #fff 34%, #eef1ef 100%);
}

.dialog-media img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  background: #fff;
  border-radius: 10px;
  box-shadow: inset 0 0 0 1px rgba(17, 21, 22, 0.06);
}

.dialog-price {
  display: grid;
  gap: 5px;
  padding: 16px;
  background: #fff;
  border: 1px solid #e1e4e6;
  border-radius: 9px;
}

.dialog-price strong {
  color: #9a3428;
  font-size: 22px;
}

.dialog-body {
  max-height: min(780px, calc(100vh - 28px));
  overflow: auto;
  padding: 38px 36px;
}

.dialog-body h3 {
  margin: 0 0 14px;
  font-size: 34px;
  line-height: 1.12;
}

.dialog-lead,
.dialog-note {
  color: #5e666b;
  line-height: 1.75;
}

.spec-list,
.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
  padding: 0;
  list-style: none;
}

.chip-grid span,
.spec-list li {
  padding: 8px 10px;
  background: #f1f3f3;
  border: 1px solid #e0e4e5;
  border-radius: 999px;
  font-size: 13px;
}

@keyframes scrollCue {
  0%, 100% { transform: translate(0, -50%); opacity: 0.42; }
  50% { transform: translate(68px, -50%); opacity: 1; }
}

@keyframes pageLightSweep {
  0% {
    opacity: 0;
    transform: translate3d(0, -40%, 0);
  }
  36% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate3d(0, 320%, 0);
  }
}

@keyframes pageLightSweepUp {
  0% {
    opacity: 0;
    transform: translate3d(0, 320%, 0);
  }
  36% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate3d(0, -40%, 0);
  }
}

@keyframes pageEnterUp {
  0% {
    opacity: 0;
    transform: translate3d(0, 44px, 0) scale(0.988);
  }
  100% {
    opacity: 1;
    transform: translate3d(0, 0, 0) scale(1);
  }
}

@keyframes pageEnterDown {
  0% {
    opacity: 0;
    transform: translate3d(0, -44px, 0) scale(0.988);
  }
  100% {
    opacity: 1;
    transform: translate3d(0, 0, 0) scale(1);
  }
}

@keyframes flightFocus {
  0%, 19% {
    transform:
      translate3d(var(--drift-x, 0px), var(--drift-y, 0px), 0)
      rotateX(var(--tilt-y, 0deg))
      rotateY(var(--tilt-x, 0deg))
      scale(1);
    opacity: 0.98;
  }
  38% {
    transform:
      translate3d(calc(var(--drift-x, 0px) - 1.5%), calc(var(--drift-y, 0px) - 0.5%), 0)
      rotateX(var(--tilt-y, 0deg))
      rotateY(var(--tilt-x, 0deg))
      scale(1.04);
    opacity: 1;
  }
  60% {
    transform:
      translate3d(calc(var(--drift-x, 0px) - 4%), calc(var(--drift-y, 0px) - 2%), 0)
      rotateX(var(--tilt-y, 0deg))
      rotateY(var(--tilt-x, 0deg))
      scale(1.14);
    opacity: 0.94;
  }
  78%, 100% {
    transform:
      translate3d(calc(var(--drift-x, 0px) - 8%), calc(var(--drift-y, 0px) - 4%), 0)
      rotateX(var(--tilt-y, 0deg))
      rotateY(var(--tilt-x, 0deg))
      scale(1.26);
    opacity: 0.52;
  }
}

@keyframes flightHover {
  0%, 100% { margin-top: 0; }
  50% { margin-top: -8px; }
}

@keyframes shellFade {
  0%, 34% { opacity: 0.98; }
  48% { opacity: 0.55; }
  66%, 100% { opacity: 0.22; }
}

@keyframes xrayReveal {
  0%, 27% { opacity: 0; }
  43% { opacity: 0.34; }
  60% { opacity: 0.72; }
  78%, 100% { opacity: 0.46; }
}

@keyframes flightScan {
  0%, 26% {
    left: 10%;
    opacity: 0;
  }
  37% {
    opacity: 0.9;
  }
  58% {
    left: 77%;
    opacity: 0.8;
  }
  74%, 100% {
    left: 82%;
    opacity: 0;
  }
}

@keyframes propellerSpin {
  to {
    transform: translate(-50%, -50%) rotate(calc(var(--prop-angle, 0deg) + 1turn));
  }
}

@keyframes chassisFocus {
  0%, 22% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.96;
  }
  40% {
    transform: translate3d(-1%, -0.5%, 0) scale(1.04);
    opacity: 0.98;
  }
  58% {
    transform: translate3d(-4%, -2.5%, 0) scale(1.13);
    opacity: 0.86;
  }
  76%, 100% {
    transform: translate3d(-8%, -4%, 0) scale(1.22);
    opacity: 0.5;
  }
}

@keyframes mountReticle {
  0%, 22% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.62);
  }
  34% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  54% {
    opacity: 0.9;
    transform: translate(-50%, -50%) scale(1.16);
  }
  76%, 100% {
    opacity: 0.3;
    transform: translate(-50%, -50%) scale(1.2);
  }
}

@keyframes zoomBeam {
  0%, 34% {
    opacity: 0;
    transform: rotate(-9deg) scaleX(0.12);
  }
  46% {
    opacity: 0.96;
    transform: rotate(-9deg) scaleX(1);
  }
  64% {
    opacity: 0.72;
    transform: rotate(-9deg) scaleX(1.08);
  }
  82%, 100% {
    opacity: 0.18;
    transform: rotate(-9deg) scaleX(0.82);
  }
}

@keyframes sheetReveal {
  0%, 40% {
    opacity: 0;
    transform: translate3d(10%, 8%, 0) rotate(-4deg) scale(0.82);
  }
  55% {
    opacity: 0.92;
    transform: translate3d(0, 0, 0) rotate(-4deg) scale(1);
  }
  74%, 100% {
    opacity: 0.72;
    transform: translate3d(0, 0, 0) rotate(-4deg) scale(1);
  }
}

@keyframes nutReveal {
  0%, 44% {
    opacity: 0;
    transform: translate3d(16%, 4%, 0) scale(0.62);
  }
  60% {
    opacity: 1;
    transform: translate3d(0, 0, 0) scale(1);
  }
  82%, 100% {
    opacity: 1;
    transform: translate3d(0, 0, 0) scale(1.04);
  }
}

@keyframes stepA {
  0%, 30% { opacity: 1; transform: translateY(0); }
  43%, 100% { opacity: 0.22; transform: translateY(-4px); }
}

@keyframes stepB {
  0%, 25% { opacity: 0; transform: translateY(8px); }
  38%, 63% { opacity: 1; transform: translateY(0); }
  78%, 100% { opacity: 0.28; transform: translateY(-4px); }
}

@keyframes stepC {
  0%, 48% { opacity: 0; transform: translateY(8px); }
  62%, 100% { opacity: 1; transform: translateY(0); }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 1280px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-studio {
    justify-items: start;
  }

  .hero-model-stage {
    width: min(980px, 100%);
  }

  .flight-vehicle {
    inset: -20% -8% -22% -8%;
  }

  .nut-closeup {
    right: 3%;
    width: 40%;
  }

  .category-wall,
  .premium-products {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .catalog-screen .screen-head {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 14px;
  }

  .catalog-screen .screen-head .kicker {
    grid-column: auto;
  }

  .premium-screen {
    min-height: 100svh;
  }
}

@media (max-width: 860px) {
  html {
    scroll-snap-type: y proximity;
  }

  body::before,
  body::after {
    display: none;
  }

  body.is-paging .premium-screen,
  body.is-paging .premium-screen.is-active {
    filter: none;
    opacity: 1;
    transform: none;
  }

  .section-rail {
    display: none;
  }

  .premium-nav {
    grid-template-columns: 1fr auto;
    min-height: 64px;
    padding: 10px 14px;
  }

  .premium-nav nav {
    display: none;
  }

  .premium-brand strong {
    display: none;
  }

  .premium-screen {
    min-height: 100svh;
    padding: 88px 14px 36px;
    overflow: visible;
  }

  .catalog-screen,
  .capability-screen,
  .rfq-screen {
    min-height: auto;
    padding-top: 84px;
    padding-bottom: 34px;
  }

  .hero-grid {
    gap: 26px;
  }

  .premium-hero {
    align-items: start;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(5, 6, 6, 0.98) 0%, rgba(5, 6, 6, 0.84) 70%, rgba(5, 6, 6, 0.65) 100%),
      linear-gradient(180deg, rgba(5, 6, 6, 0.24), rgba(5, 6, 6, 0.9));
  }

  h1 {
    max-width: 390px;
    font-size: clamp(38px, 12vw, 48px);
    line-height: 1.04;
  }

  h2 {
    font-size: 34px;
  }

  .hero-lead,
  .screen-head p,
  .rfq-layout > div p {
    font-size: 16px;
  }

  .hero-lead {
    max-width: 360px;
    margin-top: 20px;
  }

  .hero-actions {
    margin-top: 26px;
  }

  .hero-studio {
    width: 100%;
  }

  .hero-model-stage {
    width: 100%;
    max-height: none;
    aspect-ratio: 1.22;
  }

  .flight-vehicle {
    inset: -10% -38% -13% -40%;
  }

  .mount-reticle {
    top: 52%;
    left: 73%;
    width: 68px;
    height: 68px;
  }

  .nut-closeup {
    top: 39%;
    right: 1%;
    width: 55%;
  }

  .sheet-cutaway {
    right: 7%;
    bottom: 11%;
    width: 58%;
    height: 18%;
  }

  .zoom-beam {
    top: 52%;
    left: 73%;
    width: 42%;
    transform: rotate(-7deg) scaleX(0.15);
  }

  .propeller {
    width: clamp(58px, 18vw, 112px);
  }

  .propeller-a {
    top: 33%;
    left: 7%;
  }

  .propeller-b {
    top: 28%;
    left: 49%;
  }

  .propeller-c {
    top: 35%;
    left: 91%;
  }

  .propeller-d {
    top: 57%;
    left: 79%;
  }

  .story-step {
    display: none;
  }

  .step-a {
    top: 8%;
    left: 5%;
  }

  .step-b {
    left: 8%;
    bottom: 29%;
  }

  .step-c {
    top: 31%;
    right: 5%;
  }

  .hero-nut-viewer {
    inset: -7% -6% -5%;
  }

  .model-tag {
    display: none;
  }

  .hero-strip {
    display: none;
  }

  .scroll-cue {
    bottom: 18px;
  }

  .category-wall,
  .premium-products,
  .capability-grid,
  .rfq-form,
  .dialog-layout {
    grid-template-columns: 1fr;
  }

  .category-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .category-wall,
  .capability-grid {
    gap: 10px;
  }

  .category-card {
    min-height: 178px;
    padding: 14px;
  }

  .category-card h3 {
    margin: 8px 0 7px;
    font-size: 18px;
  }

  .category-card ul {
    gap: 4px;
    font-size: 12px;
  }

  .category-card button {
    min-height: 34px;
    margin-top: 9px;
    font-size: 12px;
  }

  .capability-grid article {
    min-height: auto;
    padding: 18px;
  }

  .capability-grid h3 {
    margin: 12px 0 8px;
  }

  .rfq-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .screen-head.wide {
    display: grid;
  }

  .filter-line {
    justify-content: flex-start;
  }

  .premium-product {
    grid-template-rows: 210px 1fr;
    min-height: auto;
    border-radius: 10px;
  }

  .dialog-body {
    max-height: none;
  }
}

@media (max-width: 480px) {
  .premium-screen {
    padding-right: 14px;
    padding-left: 14px;
  }

  .kicker {
    margin-bottom: 16px;
    font-size: 11px;
  }

  .nav-action,
  .button {
    min-height: 42px;
    padding: 0 16px;
  }

  h1 {
    max-width: 350px;
    font-size: clamp(34px, 11vw, 42px);
  }

  .catalog-screen h2,
  .premium-screen:not(.premium-hero) h2 {
    font-size: 30px;
  }

  .screen-head {
    margin-bottom: 18px;
  }

  .category-card ul {
    grid-template-columns: 1fr;
  }

  .category-card {
    min-height: 170px;
    padding: 12px;
  }

  .rfq-form {
    padding: 14px;
  }

  .studio-caption strong {
    font-size: 16px;
    line-height: 1.2;
  }

  .studio-caption {
    gap: 5px;
    font-size: 12px;
    line-height: 1.35;
  }

  .flight-vehicle {
    inset: -7% -52% -10% -50%;
  }

  .mount-reticle {
    top: 52%;
    left: 72%;
  }

  .nut-closeup {
    top: 41%;
    right: -1%;
    width: 58%;
  }

  .sheet-cutaway {
    right: 5%;
    width: 66%;
  }

  .zoom-beam {
    width: 38%;
  }

  .product-copy {
    padding: 18px;
  }
}

/* premium11: clean interactive self-clinching nut hero */
.premium-hero {
  --hero-glow-x: 58%;
  --hero-glow-y: 42%;
  --hero-tilt-x: 0deg;
  --hero-tilt-y: 0deg;
  background:
    radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.18), transparent 0 18rem),
    radial-gradient(circle at 72% 66%, rgba(220, 75, 54, 0.12), transparent 0 24rem),
    linear-gradient(135deg, #050606 0%, #0a0d0c 46%, #111413 100%);
}

.premium-screen.is-active.premium-hero::before {
  opacity: 0.055;
  mask-image: radial-gradient(circle at 68% 48%, #000 0 42%, transparent 72%);
}

.premium-screen.is-active.premium-hero::after {
  opacity: 0.75;
  background:
    radial-gradient(ellipse at 68% 52%, rgba(255, 255, 255, 0.08), transparent 0 34%),
    linear-gradient(180deg, transparent 0%, rgba(220, 75, 54, 0.04) 58%, transparent 100%);
}

.premium-hero .hero-media {
  background:
    linear-gradient(90deg, rgba(5, 6, 6, 0.94) 0%, rgba(5, 6, 6, 0.5) 46%, rgba(5, 6, 6, 0.18) 100%),
    radial-gradient(circle at 72% 46%, rgba(255, 255, 255, 0.09), transparent 0 34%),
    radial-gradient(circle at 50% 72%, rgba(0, 0, 0, 0.42), transparent 0 38%);
}

.premium-hero .hero-shade {
  background:
    linear-gradient(180deg, rgba(5, 6, 6, 0.18), rgba(5, 6, 6, 0.74)),
    linear-gradient(90deg, rgba(5, 6, 6, 0.7), transparent 42%, rgba(5, 6, 6, 0.18));
}

.nut-hero-grid {
  width: min(1760px, 100%);
  grid-template-columns: minmax(340px, 0.48fr) minmax(560px, 1fr);
  gap: clamp(24px, 5vw, 96px);
}

.nut-hero-grid .hero-copy {
  align-self: center;
  padding-bottom: min(6vh, 54px);
}

.nut-hero-grid .kicker {
  margin-bottom: 18px;
  color: rgba(214, 221, 219, 0.82);
}

.nut-hero-grid h1 {
  max-width: 720px;
  font-size: clamp(46px, 5.1vw, 88px);
  line-height: 1.02;
}

.nut-hero-grid .hero-lead {
  max-width: 620px;
  color: rgba(248, 245, 239, 0.68);
  font-size: clamp(16px, 1.08vw, 19px);
  line-height: 1.78;
}

.nut-hero-studio {
  width: 100%;
  justify-items: center;
}

.nut-hero-stage {
  position: relative;
  width: min(900px, 52vw);
  min-width: 520px;
  aspect-ratio: 1;
  overflow: visible;
  cursor: default;
  isolation: isolate;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  transform:
    perspective(1300px)
    rotateX(var(--hero-tilt-y))
    rotateY(var(--hero-tilt-x));
  transform-style: preserve-3d;
  transition: transform 0.28s ease;
}

.nut-hero-stage::before {
  position: absolute;
  inset: 8%;
  z-index: 0;
  content: "";
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 48%, rgba(255, 255, 255, 0.08), transparent 0 48%),
    conic-gradient(from 18deg, transparent 0 16%, rgba(255, 255, 255, 0.16) 18%, transparent 22% 47%, rgba(220, 75, 54, 0.2) 50%, transparent 54% 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  opacity: 0.5;
  filter: blur(0.2px);
  transform: translateZ(-80px);
}

.nut-hero-stage::after {
  position: absolute;
  right: 10%;
  bottom: 4%;
  left: 10%;
  z-index: 1;
  height: 18%;
  content: "";
  pointer-events: none;
  background:
    radial-gradient(ellipse, rgba(0, 0, 0, 0.78), transparent 68%);
  filter: blur(26px);
}

.nut-light-field {
  position: absolute;
  inset: -8%;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.24), transparent 0 20%),
    radial-gradient(circle at 18% 28%, rgba(190, 219, 224, 0.16), transparent 0 24%),
    radial-gradient(circle at 76% 68%, rgba(220, 75, 54, 0.15), transparent 0 27%);
  mix-blend-mode: screen;
  opacity: 0.78;
}

.hero-nut-main {
  position: absolute;
  inset: -6%;
  z-index: 3;
  width: auto;
  height: auto;
  filter:
    drop-shadow(0 46px 42px rgba(0, 0, 0, 0.42))
    drop-shadow(0 0 48px rgba(255, 255, 255, 0.08));
}

.nut-orbit {
  position: absolute;
  inset: 14%;
  z-index: 2;
  pointer-events: none;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 50%;
  transform: rotateX(68deg) rotateZ(-16deg);
}

.orbit-b {
  inset: 24%;
  border-color: rgba(220, 75, 54, 0.18);
  transform: rotateX(64deg) rotateZ(32deg);
}

.nut-spec-point {
  position: absolute;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 30px;
  padding: 6px 10px;
  color: rgba(255, 255, 255, 0.82);
  background: rgba(8, 10, 10, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 999px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18);
  font-size: 12px;
  font-weight: 900;
  backdrop-filter: blur(12px);
  pointer-events: none;
}

.nut-spec-point::before {
  width: 7px;
  height: 7px;
  content: "";
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 0 18px rgba(220, 75, 54, 0.86);
}

.point-serration {
  top: 17%;
  left: 3%;
}

.point-thread {
  top: 41%;
  right: -2%;
}

.point-face {
  bottom: 22%;
  left: 8%;
}

.nut-control-bar {
  position: absolute;
  right: 6%;
  bottom: 6%;
  z-index: 6;
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: calc(100% - 12%);
  padding: 7px;
  color: rgba(255, 255, 255, 0.68);
  background: rgba(6, 8, 8, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 999px;
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(16px);
  font-size: 12px;
}

.nut-control-bar button {
  min-height: 32px;
  padding: 0 13px;
  color: #fff;
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
  cursor: pointer;
  transition: background 0.22s ease, border-color 0.22s ease, transform 0.22s ease;
}

.nut-control-bar button:hover {
  background: rgba(220, 75, 54, 0.92);
  border-color: rgba(220, 75, 54, 0.9);
  transform: translateY(-1px);
}

.nut-control-bar span {
  padding: 0 8px 0 2px;
  white-space: nowrap;
}

.nut-hero-stage .studio-watermark {
  right: 3%;
  bottom: 0;
  z-index: 2;
  color: rgba(255, 255, 255, 0.14);
}

.nut-hero-studio .studio-caption {
  width: min(720px, 100%);
  justify-self: center;
  text-align: center;
}

.nut-hero-studio .studio-caption strong {
  font-size: clamp(17px, 1.8vw, 26px);
}

@media (max-width: 1280px) {
  .nut-hero-grid {
    grid-template-columns: 1fr;
    align-content: center;
    gap: 18px;
  }

  .nut-hero-grid .hero-copy {
    max-width: 820px;
    padding-bottom: 0;
  }

  .nut-hero-stage {
    width: min(780px, 82vw);
    min-width: 0;
  }
}

@media (max-width: 860px) {
  .premium-hero {
    align-items: center;
    padding-top: 78px;
    padding-bottom: 34px;
  }

  .nut-hero-grid {
    gap: 14px;
  }

  .nut-hero-studio {
    order: 1;
  }

  .nut-hero-grid .hero-copy {
    order: 2;
  }

  .nut-hero-grid h1 {
    max-width: 520px;
    font-size: clamp(34px, 10vw, 48px);
  }

  .nut-hero-grid .hero-lead {
    max-width: 520px;
    margin-top: 16px;
    font-size: 15px;
    line-height: 1.58;
  }

  .nut-hero-grid .hero-actions {
    margin-top: 18px;
  }

  .nut-hero-stage {
    width: min(620px, 94vw);
    aspect-ratio: 1;
  }

  .hero-nut-main {
    inset: -8%;
  }

  .nut-spec-point {
    display: none;
  }

  .nut-control-bar {
    right: 50%;
    bottom: 1%;
    max-width: 94%;
    transform: translateX(50%);
  }

  .nut-control-bar span {
    display: none;
  }

  .nut-hero-studio .studio-caption {
    display: none;
  }
}

@media (max-width: 480px) {
  .nut-hero-stage {
    width: min(390px, 94vw);
  }

  .nut-control-bar {
    gap: 5px;
    padding: 6px;
  }

  .nut-control-bar button {
    min-height: 30px;
    padding: 0 10px;
  }
}

/* premium12: quieter single-product hero */
.premium-hero {
  background:
    radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.12), transparent 0 18rem),
    radial-gradient(circle at 74% 68%, rgba(220, 75, 54, 0.075), transparent 0 24rem),
    linear-gradient(135deg, #050606 0%, #090c0b 48%, #101311 100%);
}

.nut-hero-grid {
  grid-template-columns: minmax(320px, 0.42fr) minmax(620px, 1fr);
  gap: clamp(18px, 4vw, 72px);
}

.nut-hero-grid .hero-copy {
  padding-bottom: min(3vh, 30px);
}

.nut-hero-grid h1 {
  max-width: 620px;
  font-size: clamp(42px, 4.4vw, 74px);
  line-height: 1.05;
}

.nut-hero-grid .hero-lead {
  max-width: 540px;
  font-size: clamp(15px, 1vw, 18px);
  line-height: 1.72;
}

.nut-hero-stage {
  width: min(840px, 50vw);
  min-width: 560px;
}

.nut-hero-stage::before {
  inset: 12%;
  opacity: 0.28;
}

.nut-light-field {
  opacity: 0.62;
}

.hero-nut-main {
  inset: -1%;
}

.nut-orbit {
  opacity: 0.34;
}

.nut-spec-point,
.hero-strip,
.nut-hero-studio .studio-caption,
.nut-hero-stage .studio-watermark {
  display: none;
}

.nut-control-bar {
  right: 7%;
  bottom: 8%;
  gap: 6px;
  padding: 6px;
  background: rgba(6, 8, 8, 0.54);
}

.nut-control-bar span {
  display: none;
}

.nut-control-bar button {
  min-height: 31px;
  min-width: 74px;
  padding: 0 12px;
  font-size: 12px;
  white-space: nowrap;
}

.premium-hero .scroll-cue {
  bottom: 28px;
}

@media (max-width: 1280px) {
  .nut-hero-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .nut-hero-stage {
    width: min(720px, 80vw);
    min-width: 0;
  }
}

@media (max-width: 860px) {
  .premium-hero {
    align-items: center;
    padding-top: 72px;
    padding-bottom: 28px;
  }

  .nut-hero-grid {
    gap: 8px;
  }

  .nut-hero-grid h1 {
    max-width: 520px;
    font-size: clamp(32px, 9.2vw, 44px);
  }

  .nut-hero-grid .hero-lead {
    margin-top: 14px;
    font-size: 15px;
    line-height: 1.56;
  }

  .nut-hero-stage {
    width: min(520px, 94vw);
  }

  .hero-nut-main {
    inset: -2%;
  }

  .nut-control-bar {
    right: 50%;
    bottom: 3%;
    transform: translateX(50%);
  }
}

@media (max-width: 480px) {
  .nut-hero-stage {
    width: min(360px, 94vw);
  }

  .nut-hero-grid .hero-actions {
    margin-top: 18px;
  }
}

.premium-hero .hero-copy {
  max-width: 540px;
}

.premium-hero .kicker {
  color: rgba(214, 221, 219, 0.72);
  font-size: 11px;
}

.nut-hero-grid h1 {
  max-width: 520px;
  font-size: clamp(38px, 3.8vw, 64px);
}

.nut-hero-grid .hero-lead {
  max-width: 500px;
}

body.is-hero-screen .section-rail {
  opacity: 0;
  pointer-events: none;
}

/* premium13: integrated background, smaller nut, simpler copy */
.premium-hero {
  background:
    radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.1), transparent 0 17rem),
    radial-gradient(circle at 70% 62%, rgba(220, 75, 54, 0.055), transparent 0 25rem),
    linear-gradient(135deg, #050606 0%, #080a09 50%, #0d100f 100%);
}

.premium-hero .hero-media {
  background:
    radial-gradient(circle at 69% 52%, rgba(255, 255, 255, 0.05), transparent 0 36%),
    linear-gradient(90deg, rgba(5, 6, 6, 0.88) 0%, rgba(5, 6, 6, 0.48) 46%, rgba(5, 6, 6, 0.14) 100%);
}

.premium-hero .hero-shade {
  background:
    linear-gradient(180deg, rgba(5, 6, 6, 0.08), rgba(5, 6, 6, 0.64)),
    linear-gradient(90deg, rgba(5, 6, 6, 0.68), transparent 48%, rgba(5, 6, 6, 0.16));
}

.nut-hero-grid {
  grid-template-columns: minmax(280px, 0.36fr) minmax(560px, 1fr);
  gap: clamp(8px, 3vw, 54px);
}

.premium-hero .hero-copy {
  max-width: 410px;
}

.premium-hero .kicker {
  margin-bottom: 14px;
  color: rgba(214, 221, 219, 0.58);
  font-size: 10px;
  letter-spacing: 0.14em;
}

.nut-hero-grid h1 {
  max-width: 410px;
  font-size: clamp(42px, 4.2vw, 68px);
  line-height: 1;
}

.nut-hero-grid .hero-lead {
  max-width: 390px;
  margin-top: 18px;
  color: rgba(248, 245, 239, 0.6);
  font-size: clamp(14px, 0.9vw, 16px);
  line-height: 1.62;
}

.nut-hero-stage {
  width: min(720px, 45vw);
  min-width: 500px;
  background: transparent;
}

.nut-hero-stage::before,
.nut-hero-stage::after,
.nut-orbit {
  display: none;
}

.nut-light-field {
  inset: -14%;
  background:
    radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.16), transparent 0 20%),
    radial-gradient(circle at 30% 36%, rgba(190, 219, 224, 0.07), transparent 0 28%),
    radial-gradient(circle at 75% 70%, rgba(220, 75, 54, 0.08), transparent 0 32%);
  opacity: 0.52;
}

.hero-nut-main {
  inset: 3%;
  filter:
    drop-shadow(0 34px 34px rgba(0, 0, 0, 0.36))
    drop-shadow(0 0 34px rgba(255, 255, 255, 0.045));
}

.nut-control-bar {
  right: 11%;
  bottom: 12%;
  background: rgba(6, 8, 8, 0.44);
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.18);
}

@media (max-width: 1280px) {
  .nut-hero-stage {
    width: min(640px, 76vw);
    min-width: 0;
  }
}

@media (max-width: 860px) {
  .premium-hero {
    padding-top: 72px;
  }

  .nut-hero-grid h1 {
    max-width: 360px;
    font-size: clamp(38px, 10vw, 48px);
  }

  .nut-hero-grid .hero-lead {
    max-width: 340px;
    margin-top: 12px;
  }

  .nut-hero-stage {
    width: min(440px, 92vw);
  }

  .hero-nut-main {
    inset: 2%;
  }

  .nut-control-bar {
    right: 50%;
    bottom: 3%;
    transform: translateX(50%);
  }
}

@media (max-width: 480px) {
  .nut-hero-stage {
    width: min(330px, 92vw);
  }
}

@media (max-width: 860px) {
  .nut-hero-grid {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .nut-hero-grid .hero-copy,
  .nut-hero-studio {
    width: 100%;
    max-width: none;
  }

  .nut-hero-studio {
    justify-items: center;
  }

  .nut-hero-grid .hero-copy {
    padding-bottom: 0;
  }
}

/* premium15: brighter dynamic metal studio */
.premium-hero {
  color: #121616;
  background:
    radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.9), transparent 0 18rem),
    radial-gradient(circle at 76% 62%, rgba(220, 75, 54, 0.1), transparent 0 22rem),
    linear-gradient(135deg, #eef1ee 0%, #d8ddd9 42%, #aeb8b5 100%);
}

.premium-hero .hero-media {
  background:
    radial-gradient(circle at 66% 52%, rgba(255, 255, 255, 0.78), transparent 0 34%),
    linear-gradient(115deg, rgba(255, 255, 255, 0.68), rgba(222, 228, 225, 0.38) 42%, rgba(105, 119, 116, 0.2)),
    repeating-linear-gradient(105deg, rgba(255, 255, 255, 0.16) 0 1px, transparent 1px 84px);
}

.premium-hero .hero-media::before {
  position: absolute;
  inset: -20%;
  content: "";
  background:
    linear-gradient(110deg, transparent 18%, rgba(255, 255, 255, 0.42) 35%, transparent 48%),
    linear-gradient(290deg, transparent 42%, rgba(220, 75, 54, 0.08) 54%, transparent 64%);
  opacity: 0.76;
  transform: translate3d(-8%, 0, 0);
  animation: premiumMetalFlow 12s cubic-bezier(0.45, 0, 0.2, 1) infinite alternate;
}

.premium-hero .hero-shade {
  background:
    linear-gradient(90deg, rgba(244, 247, 244, 0.94) 0%, rgba(232, 237, 234, 0.72) 43%, rgba(207, 216, 213, 0.22) 100%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.32), rgba(175, 187, 184, 0.3));
}

.premium-hero::before {
  opacity: 0.18;
  background:
    linear-gradient(90deg, rgba(17, 21, 22, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(17, 21, 22, 0.04) 1px, transparent 1px);
  mask-image: radial-gradient(circle at 62% 48%, #000 0 42%, transparent 76%);
}

.premium-hero .kicker {
  color: rgba(35, 45, 45, 0.64);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.nut-hero-grid h1 {
  max-width: 560px;
  color: #111515;
  font-size: clamp(44px, 4.6vw, 76px);
}

.nut-hero-grid .hero-lead {
  max-width: 440px;
  color: rgba(27, 35, 35, 0.68);
}

.premium-hero .button.secondary {
  color: #151b1b;
  background: rgba(255, 255, 255, 0.52);
  border-color: rgba(17, 21, 22, 0.16);
}

.premium-hero .scroll-cue::before {
  background: rgba(17, 21, 22, 0.34);
}

.premium-hero .scroll-cue span {
  background: #111515;
}

.nut-light-field {
  background:
    radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.78), transparent 0 24%),
    radial-gradient(circle at 72% 68%, rgba(220, 75, 54, 0.12), transparent 0 30%),
    radial-gradient(circle at 28% 34%, rgba(92, 116, 118, 0.12), transparent 0 28%);
  opacity: 0.84;
}

.hero-nut-main {
  filter:
    drop-shadow(0 34px 36px rgba(58, 68, 68, 0.24))
    drop-shadow(0 0 38px rgba(255, 255, 255, 0.55));
}

.nut-control-bar {
  background: rgba(255, 255, 255, 0.48);
  border-color: rgba(17, 21, 22, 0.12);
  box-shadow: 0 18px 48px rgba(70, 80, 80, 0.16);
}

.nut-control-bar button {
  color: #131818;
  background: rgba(255, 255, 255, 0.62);
  border-color: rgba(17, 21, 22, 0.1);
}

@keyframes premiumMetalFlow {
  0% {
    transform: translate3d(-10%, -2%, 0) rotate(0.001deg);
  }
  100% {
    transform: translate3d(10%, 4%, 0) rotate(0.001deg);
  }
}

@media (max-width: 860px) {
  .premium-hero .hero-shade {
    background:
      linear-gradient(180deg, rgba(244, 247, 244, 0.92), rgba(218, 226, 223, 0.58)),
      linear-gradient(90deg, rgba(244, 247, 244, 0.84), rgba(244, 247, 244, 0.28));
  }

  .premium-hero .kicker {
    font-size: 12px;
  }

  .nut-hero-grid h1 {
    font-size: clamp(36px, 9.8vw, 48px);
  }
}

/* premium16: sharper serration model and cleaner product-first hero */
.nut-hero-grid h1 {
  width: max-content;
  max-width: 100%;
  white-space: nowrap;
  line-height: 0.96;
  letter-spacing: 0;
}

.nut-hero-grid .hero-copy {
  z-index: 8;
}

.nut-control-bar {
  right: 50%;
  bottom: 7%;
  gap: 0;
  padding: 9px 15px;
  color: rgba(21, 27, 27, 0.68);
  background: rgba(255, 255, 255, 0.58);
  border-color: rgba(17, 21, 22, 0.1);
}

.nut-control-bar span {
  display: inline-block;
  padding: 0;
  color: rgba(21, 27, 27, 0.7);
  font-weight: 800;
  white-space: nowrap;
}

.nut-control-bar button {
  display: none;
}

@media (min-width: 861px) {
  .nut-hero-grid {
    grid-template-columns: minmax(360px, 0.72fr) minmax(540px, 1.28fr);
    gap: clamp(24px, 4vw, 72px);
  }

  .nut-hero-grid .hero-copy {
    align-self: center;
    padding-left: clamp(0px, 2vw, 24px);
  }

  .nut-hero-stage {
    transform: translateX(-2%);
  }
}

@media (max-width: 860px) {
  .premium-hero {
    min-height: 100svh;
    padding: 70px 18px 30px;
  }

  .nut-hero-grid {
    display: grid;
    grid-template-rows: minmax(270px, 46svh) auto;
    align-content: center;
    gap: 22px;
    width: min(100%, 480px);
    min-height: calc(100svh - 118px);
    margin: 0 auto;
  }

  .nut-hero-studio {
    order: 1;
    align-self: end;
    min-height: 0;
  }

  .nut-hero-grid .hero-copy {
    order: 2;
    width: min(100%, 360px);
    margin: 0 0 0 auto;
    padding: 0;
    text-align: left;
  }

  .premium-hero .kicker {
    position: relative;
    width: max-content;
    max-width: 100%;
    margin-bottom: 9px;
    padding-left: 42px;
    font-size: 11px;
    letter-spacing: 0.05em;
  }

  .premium-hero .kicker::before {
    position: absolute;
    left: 0;
    top: 50%;
    width: 30px;
    height: 1px;
    content: "";
    background: rgba(21, 27, 27, 0.38);
  }

  .nut-hero-grid h1 {
    font-size: clamp(42px, 15vw, 64px);
    text-align: left;
    white-space: nowrap;
  }

  .nut-hero-grid .hero-lead {
    max-width: 285px;
    margin-top: 10px;
    font-size: 13px;
    line-height: 1.72;
  }

  .nut-hero-grid .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: min(100%, 310px);
    margin-top: 16px;
  }

  .premium-hero .button {
    min-height: 42px;
    padding: 0 12px;
    font-size: 13px;
  }

  .nut-hero-stage {
    width: min(92vw, 368px);
    margin: 0 auto;
    aspect-ratio: 1.02;
  }

  .hero-nut-main {
    inset: 0;
  }

  .nut-light-field {
    opacity: 0.68;
  }

  .nut-control-bar {
    display: none;
  }

  .hero-strip,
  .studio-caption {
    display: none;
  }
}

@media (max-width: 420px) {
  .nut-hero-grid {
    grid-template-rows: minmax(252px, 43svh) auto;
  }

  .nut-hero-grid h1 {
    width: 100%;
    font-size: clamp(34px, 12.2vw, 46px);
    white-space: nowrap;
  }

  .nut-hero-grid .hero-copy {
    width: min(100%, 330px);
  }

  .nut-hero-stage {
    width: min(90vw, 346px);
  }
}

/* premium19: visible language selector and product matrix alignment fixes */
.premium-nav {
  grid-template-columns: minmax(0, 1fr) auto auto auto;
}

.premium-language {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: rgba(248, 245, 239, 0.78);
  font-size: 12px;
  font-weight: 900;
  white-space: nowrap;
}

.premium-language select {
  height: 42px;
  max-width: 168px;
  padding: 0 34px 0 12px;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.13), rgba(255, 255, 255, 0.055));
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  outline: 0;
  cursor: pointer;
}

.premium-language select:focus-visible {
  border-color: rgba(220, 75, 54, 0.78);
  box-shadow: 0 0 0 4px rgba(220, 75, 54, 0.18);
}

.premium-language option {
  color: #111516;
}

body.is-light-screen .premium-language {
  color: rgba(248, 245, 239, 0.78);
}

body.is-light-screen .section-rail {
  display: none;
}

.products-screen {
  align-items: start;
  padding-right: clamp(18px, 3.2vw, 56px);
  padding-left: clamp(18px, 3.2vw, 56px);
}

.products-screen .screen-head.wide {
  align-items: end;
  gap: 18px;
  margin-bottom: 22px;
}

.premium-products {
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: clamp(14px, 1.25vw, 20px);
  align-items: stretch;
}

.premium-product {
  grid-template-rows: auto 1fr;
  min-height: 0;
  overflow: hidden;
}

.premium-product figure {
  min-height: clamp(210px, 20vw, 270px);
  padding: clamp(18px, 2vw, 28px);
  background:
    radial-gradient(ellipse at 50% 78%, rgba(18, 24, 28, 0.12), transparent 34%),
    linear-gradient(180deg, #fff 0%, #fbfcfb 54%, #f2f5f3 100%);
}

.premium-product figure::after {
  inset: 14px;
}

.premium-product img {
  display: block;
  width: min(88%, 330px);
  height: min(88%, 230px);
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  object-position: 50% 50%;
  transform: none;
}

.product-copy {
  grid-template-rows: auto auto minmax(54px, auto) auto 1fr auto;
  min-width: 0;
  min-height: 0;
}

.product-copy button {
  width: 100%;
}

@media (max-width: 1180px) {
  .premium-nav {
    gap: 16px;
  }

  .premium-nav nav {
    gap: 16px;
  }

  .premium-language span {
    display: none;
  }

  .premium-language select {
    max-width: 128px;
  }
}

@media (max-width: 860px) {
  .premium-nav {
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 9px;
  }

  .premium-language {
    min-height: 40px;
  }

  .premium-language select {
    width: 86px;
    height: 40px;
    padding: 0 8px;
    font-size: 12px;
  }

  .products-screen {
    min-height: auto;
    padding: 84px 16px 42px;
    overflow: visible;
  }

  .products-screen .screen-head.wide {
    gap: 14px;
    margin-bottom: 16px;
  }

  .products-screen .screen-head.wide > div:first-child {
    display: grid;
    gap: 6px;
  }

  .filter-line {
    display: flex;
    flex-wrap: nowrap;
    justify-content: flex-start;
    width: calc(100vw - 32px);
    margin-right: -16px;
    padding: 2px 16px 8px 0;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .filter-line::-webkit-scrollbar {
    display: none;
  }

  .filter-line button {
    flex: 0 0 auto;
  }

  .premium-products {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .premium-product {
    display: grid;
    grid-template-columns: minmax(130px, 38%) 1fr;
    grid-template-rows: auto;
    align-items: stretch;
    min-height: 210px;
    border-radius: 12px;
  }

  .premium-product figure {
    min-height: 100%;
    padding: 14px;
    border-right: 1px solid #e8ebec;
    border-bottom: 0;
  }

  .premium-product img {
    width: 94%;
    height: 92%;
  }

  .product-copy {
    grid-template-rows: auto auto auto auto 1fr auto;
    gap: 7px;
    padding: 14px;
  }

  .product-copy h3 {
    font-size: 17px;
  }

  .product-copy p {
    min-height: 0;
    font-size: 13px;
    line-height: 1.42;
    -webkit-line-clamp: 3;
  }

  .product-meta {
    font-size: 12px;
  }
}

@media (max-width: 520px) {
  .premium-products {
    gap: 13px;
  }

  .premium-product {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .premium-product figure {
    min-height: 214px;
    border-right: 0;
    border-bottom: 1px solid #e8ebec;
  }

  .premium-product img {
    width: min(88%, 300px);
    height: min(88%, 190px);
  }

  .product-copy {
    padding: 15px;
  }
}

/* premium20: tighter section layout and complete contact block */
.section-rail {
  display: none;
}

.catalog-screen,
.capability-screen,
.rfq-screen {
  padding-right: clamp(18px, 4vw, 72px);
  padding-left: clamp(18px, 4vw, 72px);
}

.catalog-screen .screen-head,
.capability-screen .screen-head,
.rfq-layout {
  width: min(1280px, 100%);
}

.catalog-screen .screen-head {
  grid-template-columns: minmax(0, 0.74fr) minmax(320px, 0.52fr);
  gap: clamp(22px, 4vw, 54px);
}

.catalog-screen h2,
.capability-screen h2,
.rfq-screen h2 {
  max-width: 760px;
  font-size: clamp(34px, 3.4vw, 52px);
  line-height: 1.08;
  word-break: keep-all;
  overflow-wrap: normal;
}

.catalog-screen .screen-head p,
.capability-screen .screen-head p,
.rfq-layout > div > h2 + p {
  max-width: 560px;
  color: rgba(248, 245, 239, 0.68);
  font-size: clamp(15px, 1vw, 17px);
  line-height: 1.7;
}

.category-wall,
.capability-grid {
  width: min(1280px, 100%);
  gap: clamp(14px, 1.4vw, 20px);
}

.category-card {
  min-height: 220px;
}

.capability-screen .screen-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(18px, 3vh, 34px);
}

.capability-grid article {
  min-height: 220px;
}

.rfq-layout {
  grid-template-columns: minmax(0, 0.82fr) minmax(420px, 0.64fr);
  gap: clamp(28px, 4.8vw, 72px);
}

.rfq-layout > div {
  min-width: 0;
}

.contact-panel {
  display: grid;
  gap: 14px;
  max-width: 680px;
  margin-top: clamp(22px, 3vh, 34px);
  padding: clamp(16px, 1.6vw, 22px);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.035));
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 12px;
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.2);
}

.contact-panel h3 {
  margin: 0;
  font-size: clamp(20px, 1.45vw, 26px);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.contact-item {
  display: grid;
  gap: 4px;
  min-width: 0;
  padding: 12px;
  background: rgba(0, 0, 0, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 9px;
}

.contact-item span {
  color: rgba(248, 245, 239, 0.54);
  font-size: 12px;
  font-weight: 900;
}

.contact-item a,
.contact-item strong {
  color: #fff;
  font-size: 14px;
  font-weight: 900;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.contact-item:nth-child(5),
.contact-item:nth-child(6) {
  grid-column: 1 / -1;
}

.rfq-form {
  align-self: center;
}

@media (max-width: 1080px) {
  .category-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rfq-layout {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .contact-panel,
  .rfq-form {
    max-width: 760px;
  }
}

@media (max-width: 860px) {
  .catalog-screen,
  .capability-screen,
  .rfq-screen {
    padding: 86px 16px 38px;
  }

  .catalog-screen .screen-head {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .catalog-screen h2,
  .capability-screen h2,
  .rfq-screen h2 {
    max-width: 100%;
    font-size: clamp(29px, 8vw, 38px);
  }

  .category-wall,
  .capability-grid,
  .rfq-layout {
    width: 100%;
  }

  .category-wall {
    grid-template-columns: 1fr;
  }

  .category-card,
  .capability-grid article {
    min-height: auto;
  }

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

  .contact-item:nth-child(5),
  .contact-item:nth-child(6) {
    grid-column: auto;
  }

  .rfq-form {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .rfq-screen h2 {
    font-size: clamp(28px, 8.4vw, 34px);
  }

  .contact-panel {
    margin-top: 18px;
    padding: 14px;
  }
}

/* premium20 final polish */
.catalog-screen h2,
.capability-screen h2,
.rfq-screen h2 {
  font-size: clamp(32px, 3vw, 48px);
}

.rfq-screen h2 {
  max-width: 620px;
}

.contact-item {
  min-height: 64px;
}

@media (max-width: 860px) {
  .catalog-screen h2,
  .capability-screen h2,
  .rfq-screen h2 {
    font-size: clamp(28px, 7.4vw, 36px);
  }

  .rfq-layout {
    gap: 18px;
  }

  .contact-panel {
    gap: 12px;
  }

  .contact-panel h3 {
    font-size: 24px;
  }

  .contact-item {
    min-height: 0;
    padding: 10px 12px;
  }
}

@media (max-width: 480px) {
  .rfq-screen h2 {
    font-size: clamp(27px, 7.6vw, 32px);
  }
}

/* premium21: mobile product images fill the visual frame */
@media (max-width: 860px) {
  .premium-product figure {
    padding: 0;
    background: #fff;
  }

  .premium-product figure::after {
    inset: 0;
    border-color: rgba(17, 21, 22, 0.06);
  }

  .premium-product img {
    width: 100%;
    height: 100%;
    max-width: none;
    max-height: none;
    object-fit: cover;
    object-position: center;
    filter: none;
  }
}

@media (max-width: 520px) {
  .premium-product figure {
    min-height: 248px;
  }

  .premium-product img {
    width: 100%;
    height: 100%;
  }
}

/* premium22: continuous industrial studio for the first three screens */
:root {
  --studio-black: #050706;
  --studio-graphite: #101615;
  --studio-steel: #d9dfdc;
  --studio-mist: rgba(214, 226, 221, 0.12);
  --studio-copper: #dc4b36;
}

.premium-live-site {
  background:
    radial-gradient(circle at 72% 34%, rgba(217, 223, 220, 0.18), transparent 0 28rem),
    radial-gradient(circle at 15% 72%, rgba(220, 75, 54, 0.09), transparent 0 24rem),
    linear-gradient(145deg, var(--studio-black) 0%, #080b0a 38%, #121716 100%);
}

.premium-root {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.026) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(180deg, #eef2ef 0, #eef2ef 100%);
  background-size: 112px 112px, 112px 112px, 100% 100%;
  background-attachment: fixed, fixed, scroll;
}

.premium-hero,
.catalog-screen,
.capability-screen {
  color: #f7f3ec;
  background:
    radial-gradient(circle at 66% 44%, rgba(240, 246, 242, 0.17), transparent 0 26rem),
    radial-gradient(circle at 78% 70%, rgba(220, 75, 54, 0.11), transparent 0 24rem),
    linear-gradient(135deg, #050706 0%, #0c1110 52%, #151b19 100%);
}

.premium-hero::before,
.catalog-screen::before,
.capability-screen::before {
  opacity: 0.16;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.042) 1px, transparent 1px);
  background-size: 144px 144px;
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}

.premium-hero::after,
.catalog-screen::after,
.capability-screen::after {
  opacity: 1;
  background:
    linear-gradient(180deg, transparent 0%, transparent 63%, rgba(3, 4, 4, 0.72) 100%),
    radial-gradient(ellipse at 62% 78%, rgba(255, 255, 255, 0.075), transparent 0 44%),
    linear-gradient(110deg, transparent 0 36%, rgba(255, 255, 255, 0.07) 46%, transparent 58% 100%);
}

.premium-hero {
  background:
    radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.82), transparent 0 17rem),
    radial-gradient(circle at 78% 62%, rgba(220, 75, 54, 0.1), transparent 0 24rem),
    linear-gradient(135deg, #edf1ee 0%, #d9e0dc 46%, #aeb9b5 100%);
}

.premium-hero .hero-media {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(28, 36, 35, 0.22) 62%, rgba(5, 7, 6, 0.76)),
    radial-gradient(circle at 67% 51%, rgba(255, 255, 255, 0.82), transparent 0 32%),
    linear-gradient(115deg, rgba(255, 255, 255, 0.72), rgba(219, 226, 222, 0.42) 42%, rgba(79, 94, 91, 0.22)),
    repeating-linear-gradient(105deg, rgba(255, 255, 255, 0.16) 0 1px, transparent 1px 84px);
}

.premium-hero .hero-shade {
  background:
    linear-gradient(180deg, rgba(244, 248, 245, 0.2) 0%, rgba(216, 225, 221, 0.2) 52%, rgba(5, 7, 6, 0.88) 100%),
    linear-gradient(90deg, rgba(246, 248, 246, 0.94) 0%, rgba(231, 237, 233, 0.7) 42%, rgba(208, 217, 213, 0.18) 100%);
}

.catalog-screen {
  margin-top: -1px;
  background:
    linear-gradient(180deg, rgba(5, 7, 6, 0.98) 0%, rgba(7, 10, 9, 0.9) 16%, rgba(9, 14, 13, 0.68) 44%, rgba(8, 11, 10, 0.96) 100%),
    radial-gradient(circle at 72% 14%, rgba(231, 237, 233, 0.17), transparent 0 24rem),
    radial-gradient(circle at 14% 72%, rgba(220, 75, 54, 0.11), transparent 0 23rem),
    linear-gradient(135deg, #050706, #111816 58%, #070a09);
}

.capability-screen {
  margin-top: -1px;
  background:
    linear-gradient(180deg, rgba(8, 11, 10, 0.98) 0%, rgba(9, 13, 12, 0.84) 45%, rgba(4, 6, 6, 0.98) 100%),
    radial-gradient(circle at 78% 24%, rgba(220, 75, 54, 0.13), transparent 0 25rem),
    radial-gradient(circle at 20% 78%, rgba(218, 229, 224, 0.12), transparent 0 25rem),
    linear-gradient(135deg, #070909 0%, #111816 54%, #050706 100%);
}

.catalog-screen .screen-head,
.capability-screen .screen-head {
  position: relative;
}

.catalog-screen .screen-head::before,
.capability-screen .screen-head::before {
  position: absolute;
  left: 0;
  top: -18px;
  width: 86px;
  height: 2px;
  content: "";
  background: linear-gradient(90deg, var(--studio-copper), rgba(255, 255, 255, 0.72), transparent);
}

.catalog-screen .screen-head .kicker,
.capability-screen .screen-head .kicker {
  color: rgba(245, 239, 229, 0.76);
}

.catalog-screen .screen-head p,
.capability-screen .screen-head p {
  color: rgba(248, 245, 239, 0.7);
}

.category-wall {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: stretch;
}

.category-card,
.capability-grid article {
  position: relative;
  overflow: hidden;
  border-radius: 10px;
  border-color: rgba(255, 255, 255, 0.16);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.042) 56%, rgba(220, 75, 54, 0.045)),
    rgba(6, 9, 8, 0.66);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.16),
    0 30px 90px rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(16px) saturate(1.08);
}

.category-card::before,
.capability-grid article::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.2), transparent 28% 72%, rgba(220, 75, 54, 0.09)),
    radial-gradient(circle at 82% 18%, rgba(255, 255, 255, 0.1), transparent 0 34%);
  opacity: 0.74;
}

.category-card::after,
.capability-grid article::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  content: "";
  background: linear-gradient(90deg, rgba(220, 75, 54, 0.84), rgba(255, 255, 255, 0.36), transparent);
  opacity: 0.72;
}

.category-card > *,
.capability-grid article > * {
  position: relative;
  z-index: 1;
}

.category-card b,
.capability-grid b {
  color: #ff765f;
  letter-spacing: 0.08em;
}

.category-card h3,
.capability-grid h3 {
  color: #fffaf2;
}

.category-card ul,
.capability-grid p {
  color: rgba(248, 245, 239, 0.7);
}

.category-card button {
  color: #fff;
  background:
    linear-gradient(135deg, rgba(220, 75, 54, 0.92), rgba(133, 38, 29, 0.9));
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: 0 14px 34px rgba(220, 75, 54, 0.18);
}

.category-card:hover,
.capability-grid article:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.28);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.062) 56%, rgba(220, 75, 54, 0.06)),
    rgba(9, 13, 12, 0.7);
}

.capability-grid article {
  transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}

@media (min-width: 861px) {
  .catalog-screen,
  .capability-screen {
    min-height: 100vh;
    padding-top: clamp(92px, 10vh, 112px);
    padding-bottom: clamp(40px, 6vh, 74px);
  }

  .catalog-screen .screen-head,
  .capability-screen .screen-head,
  .category-wall,
  .capability-grid {
    width: min(1360px, 100%);
  }

  .catalog-screen .screen-head {
    grid-template-columns: minmax(0, 0.8fr) minmax(360px, 0.54fr);
  }

  .capability-screen .screen-head {
    max-width: 1360px;
    grid-template-columns: minmax(0, 0.8fr) minmax(360px, 0.52fr);
    align-items: end;
  }

  .capability-screen .screen-head p {
    max-width: 560px;
  }

  .category-card {
    min-height: clamp(226px, 25vh, 282px);
  }

  .capability-grid article {
    min-height: clamp(236px, 26vh, 292px);
  }
}

@media (max-width: 1080px) {
  .category-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .premium-root {
    background-attachment: scroll;
  }

  .premium-hero,
  .catalog-screen,
  .capability-screen {
    background:
      radial-gradient(circle at 76% 22%, rgba(238, 244, 240, 0.14), transparent 0 18rem),
      radial-gradient(circle at 16% 78%, rgba(220, 75, 54, 0.12), transparent 0 17rem),
      linear-gradient(145deg, #050706 0%, #0b1110 58%, #050706 100%);
  }

  .premium-hero {
    background:
      radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.72), transparent 0 14rem),
      linear-gradient(155deg, #eef2ef 0%, #d8dfdb 45%, #9faeaa 100%);
  }

  .premium-hero .hero-shade {
    background:
      linear-gradient(180deg, rgba(243, 247, 244, 0.84) 0%, rgba(220, 228, 224, 0.44) 52%, rgba(7, 10, 9, 0.72) 100%),
      linear-gradient(90deg, rgba(244, 247, 244, 0.7), rgba(244, 247, 244, 0.08));
  }

  .catalog-screen,
  .capability-screen {
    padding-top: 92px;
  }

  .catalog-screen .screen-head,
  .capability-screen .screen-head {
    gap: 14px;
  }

  .category-wall,
  .capability-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .category-card,
  .capability-grid article {
    border-radius: 9px;
  }
}

/* stepnut1: local STEP-derived homepage nut model */
.is-step-nut-stage {
  width: min(900px, 53vw);
  min-width: 560px;
  aspect-ratio: 1.22;
  overflow: hidden;
  border-radius: 8px;
  background:
    radial-gradient(circle at var(--hero-glow-x) var(--hero-glow-y), rgba(255, 255, 255, 0.62), transparent 0 34%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.42), rgba(255, 255, 255, 0.12));
  border: 1px solid rgba(17, 22, 22, 0.1);
  box-shadow: 0 34px 90px rgba(47, 56, 56, 0.2);
  backdrop-filter: blur(10px);
  cursor: grab;
  touch-action: none;
}

.is-step-nut-stage:active {
  cursor: grabbing;
}

.is-step-nut-stage::before {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: block;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.34), transparent 24% 70%, rgba(220, 75, 54, 0.08)),
    repeating-linear-gradient(90deg, rgba(17, 22, 22, 0.055) 0 1px, transparent 1px 88px);
  border: 1px solid rgba(17, 22, 22, 0.1);
  opacity: 0.56;
}

.is-step-nut-stage::after,
.is-step-nut-stage .nut-orbit,
.is-step-nut-stage .nut-spec-point,
.is-step-nut-stage .nut-control-bar,
.is-step-nut-stage .studio-watermark {
  display: none;
}

.is-step-nut-stage .nut-light-field {
  inset: -10%;
  z-index: 1;
  display: block;
  opacity: 0.5;
}

.hero-step-nut-canvas {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: block;
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 38px 42px rgba(0, 0, 0, 0.22));
}

.step-nut-loading {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 6;
  color: rgba(17, 22, 22, 0.58);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transform: translate(-50%, -50%);
}

.is-step-nut-ready .step-nut-loading {
  display: none;
}

@media (max-width: 1280px) {
  .is-step-nut-stage {
    width: min(820px, 82vw);
    min-width: 0;
  }
}

@media (max-width: 860px) {
  .is-step-nut-stage {
    width: min(560px, 94vw);
    aspect-ratio: 1.08;
    min-height: 330px;
  }

  .hero-step-nut-canvas {
    inset: 0;
  }
}

@media (max-width: 480px) {
  .is-step-nut-stage {
    width: min(370px, 94vw);
    min-height: 260px;
  }
}

@media (max-width: 520px) {
  .nut-hero-grid .hero-copy {
    width: min(100%, 300px);
    margin-right: auto;
    margin-left: auto;
    text-align: left;
  }

  .nut-hero-grid h1 {
    width: 100%;
    max-width: 100%;
    font-size: clamp(32px, 11.4vw, 43px);
    line-height: 1.02;
    white-space: nowrap;
  }

  .nut-hero-grid .hero-lead {
    max-width: 100%;
    font-size: 13px;
    line-height: 1.55;
  }

  .nut-hero-grid .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
    max-width: 100%;
    gap: 10px;
    overflow: hidden;
  }

  .nut-hero-grid .hero-actions .button {
    width: 100%;
    min-width: 0;
    padding-right: 8px;
    padding-left: 8px;
  }
}

/* stepnut2: integrated homepage 3D model, no separate display frame */
.is-step-nut-stage {
  width: min(760px, 47vw);
  min-width: 460px;
  aspect-ratio: 1.08;
  overflow: visible;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  cursor: grab;
}

.is-step-nut-stage::before,
.is-step-nut-stage::after {
  display: none;
}

.is-step-nut-stage .nut-light-field {
  inset: -28%;
  opacity: 0.34;
}

.hero-step-nut-canvas {
  filter:
    drop-shadow(0 28px 32px rgba(35, 45, 45, 0.18))
    drop-shadow(0 0 42px rgba(255, 255, 255, 0.14));
}

@media (min-width: 861px) {
  .is-step-nut-stage {
    transform: translateX(-4%);
  }
}

@media (max-width: 1280px) {
  .is-step-nut-stage {
    width: min(620px, 76vw);
    min-width: 0;
  }
}

@media (max-width: 860px) {
  .is-step-nut-stage {
    width: min(460px, 90vw);
    min-height: 286px;
    aspect-ratio: 1.04;
  }
}

@media (max-width: 480px) {
  .is-step-nut-stage {
    width: min(324px, 88vw);
    min-height: 232px;
  }
}

.seo-product-links {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(240px, 0.38fr) minmax(0, 1fr);
  align-content: start;
  align-items: center;
  gap: clamp(28px, 4vw, 56px);
  min-height: calc(100vh - 72px);
  width: 100%;
  margin: 0;
  padding: clamp(88px, 11vh, 128px) clamp(22px, 7vw, 116px) clamp(58px, 7vw, 92px);
  color: #f7f3ec;
  scroll-snap-align: start;
  scroll-snap-stop: normal;
  background:
    linear-gradient(180deg, rgba(8, 10, 10, 0.99) 0%, rgba(8, 11, 10, 0.94) 14%, rgba(5, 7, 6, 0.98) 100%),
    radial-gradient(circle at 72% 18%, rgba(222, 229, 225, 0.1), transparent 0 26rem),
    radial-gradient(circle at 16% 72%, rgba(202, 156, 82, 0.12), transparent 0 24rem),
    linear-gradient(180deg, #060807 0%, #0a0f0e 46%, #050706 100%);
}

.seo-product-links::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(110deg, transparent 0 36%, rgba(255, 255, 255, 0.045) 46%, transparent 56% 100%);
  background-size: 132px 132px, 132px 132px, 100% 100%;
  opacity: 0.5;
  mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
}

.seo-product-links > div:first-child {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 12px;
  min-width: 0;
  padding-top: 4px;
}

.seo-product-links p {
  margin: 0;
  color: #b9904b;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.seo-product-links h2 {
  margin: 0;
  max-width: 440px;
  color: #f8f2e8;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.02;
  letter-spacing: 0;
  text-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.seo-link-columns {
  display: grid;
  grid-template-columns: minmax(310px, 1.22fr) minmax(250px, 0.92fr) minmax(250px, 0.92fr);
  gap: clamp(16px, 1.7vw, 26px);
  align-items: stretch;
}

.seo-link-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
  min-height: clamp(254px, 30vw, 330px);
  padding: clamp(18px, 1.8vw, 26px);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 10px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.095), rgba(255, 255, 255, 0.034) 58%, rgba(185, 144, 75, 0.04)),
    rgba(11, 15, 14, 0.78);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.14),
    0 26px 80px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(18px) saturate(1.08);
}

.seo-link-group h3 {
  flex: 0 0 100%;
  margin: 0 0 6px;
  color: #fff9ef;
  font-size: clamp(16px, 1.2vw, 21px);
  line-height: 1.2;
  letter-spacing: 0;
}

.seo-link-group a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.135), rgba(255, 255, 255, 0.075));
  color: rgba(248, 245, 239, 0.86);
  font-size: clamp(13px, 0.92vw, 15px);
  line-height: 1.2;
  text-decoration: none;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.16);
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease, color 0.22s ease;
}

.seo-link-group a:hover {
  color: #fff;
  background:
    linear-gradient(135deg, rgba(185, 144, 75, 0.42), rgba(255, 255, 255, 0.12));
  border-color: rgba(218, 182, 115, 0.42);
  transform: translateY(-2px);
}

@media (max-width: 760px) {
  .seo-product-links {
    grid-template-columns: 1fr;
    gap: 22px;
    min-height: 100svh;
    padding: 82px 16px 46px;
  }

  .seo-product-links > div:first-child {
    position: relative;
    top: auto;
  }

  .seo-link-columns {
    grid-template-columns: 1fr;
  }

  .seo-link-group {
    min-height: auto;
    padding: 16px;
  }

  .seo-link-group a {
    min-height: 38px;
    padding: 0 13px;
  }
}

/* english-title-wrap2: keep English hero title in two readable lines */
html[lang="en"] .nut-hero-grid h1 {
  width: max-content;
  max-width: 620px;
  white-space: pre-line;
  line-height: 0.96;
  overflow-wrap: normal;
  word-break: normal;
}

@media (min-width: 861px) {
  html[lang="en"] .nut-hero-grid .hero-copy {
    max-width: 640px;
  }
}

@media (max-width: 520px) {
  html[lang="en"] .nut-hero-grid h1 {
    width: 100%;
    max-width: 100%;
    white-space: nowrap;
    line-height: 1.02;
  }
}