:root {
  --ink: #07101e;
  --navy: #081526;
  --navy-soft: #10243e;
  --steel: #6e7e93;
  --muted: #667085;
  --paper: #f5f7fa;
  --white: #ffffff;
  --line: #dfe5ec;
  --red: #ca2027;
  --red-dark: #a9151b;
  --cyan: #68d2e8;
  --container: 1200px;
  --shadow: 0 24px 70px rgba(8, 21, 38, 0.15);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--white);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  transform: translateY(-160%);
  border-radius: 6px;
  background: var(--white);
  padding: 10px 16px;
  color: var(--ink);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 48px), var(--container));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  padding-top: 10px;
  color: var(--white);
  pointer-events: none;
}

.site-header.scrolled {
  background: transparent;
}

.nav-shell {
  display: flex;
  width: min(calc(100% - 48px), var(--container));
  height: 68px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: 19px;
  pointer-events: auto;
  transition:
    width 0.35s cubic-bezier(0.22, 0.61, 0.36, 1),
    background-color 0.25s ease,
    border-color 0.25s ease,
    box-shadow 0.35s ease,
    backdrop-filter 0.35s ease;
}

.site-header.scrolled .nav-shell {
  width: min(calc(100% - 32px), 1160px);
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(7, 16, 30, 0.7);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.22), inset 0 1px rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(24px) saturate(165%);
}

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

.brand img {
  width: 46px;
  height: 52px;
  border-radius: 5px;
  object-fit: cover;
  object-position: top;
  filter: brightness(1.05);
}

.brand-copy {
  display: grid;
  line-height: 1.1;
}

.brand-copy strong {
  font-size: 1.08rem;
  letter-spacing: 0.15em;
}

.brand-copy small {
  margin-top: 7px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.64rem;
  letter-spacing: 0.15em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 34px;
  font-size: 0.92rem;
  font-weight: 500;
}

.main-nav > a:not(.nav-cta) {
  position: relative;
  padding: 20px 0;
  color: rgba(255, 255, 255, 0.8);
  transition: color 0.2s ease;
}

.main-nav > a:not(.nav-cta)::after {
  position: absolute;
  right: 0;
  bottom: 14px;
  left: 0;
  height: 2px;
  background: var(--red);
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.25s ease;
}

.main-nav > a:hover,
.main-nav > a.active {
  color: var(--white);
}

.main-nav > a:hover::after,
.main-nav > a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-cta {
  border: 1px solid rgba(255, 255, 255, 0.42);
  padding: 10px 18px;
  border-radius: 11px;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.nav-cta:hover {
  border-color: var(--red);
  background: var(--red);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  margin: 5px auto;
  background: var(--white);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.hero {
  position: relative;
  display: flex;
  min-height: 830px;
  overflow: hidden;
  align-items: center;
  background: var(--navy);
  color: var(--white);
}

.hero-media {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5, 14, 27, 0.97) 0%, rgba(6, 17, 32, 0.86) 40%, rgba(6, 17, 32, 0.28) 75%),
    linear-gradient(0deg, rgba(7, 16, 30, 0.86), transparent 45%),
    url("./assets/hero-furnace.webp") 65% center / cover no-repeat;
  transform: translate3d(0, calc(var(--hero-shift, 0) * 1px), 0) scale(1.045);
  will-change: transform;
}

.hero-grid {
  position: absolute;
  inset: 0;
  opacity: 0.14;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.16) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(90deg, #000, transparent 62%);
}

.hero::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 190px;
  background: linear-gradient(0deg, rgba(5, 14, 27, 0.95), transparent);
  content: "";
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  padding-top: 84px;
  align-items: end;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 80px;
}

.eyebrow {
  display: flex;
  margin: 0 0 22px;
  align-items: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.67);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.eyebrow span {
  display: inline-block;
  width: 30px;
  height: 2px;
  background: var(--red);
}

.eyebrow.dark {
  color: #718096;
}

.hero h1 {
  max-width: 830px;
  margin: 0;
  font-size: clamp(3.5rem, 6.25vw, 6.45rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.hero h1 em {
  color: #f04b50;
  font-style: normal;
}

@media (min-width: 821px) {
  .hero-title-line {
    display: inline-block;
    white-space: nowrap;
    word-break: keep-all;
    overflow-wrap: normal;
  }

  .section-heading h2.products-title-line {
    font-size: clamp(2.3rem, 3.65vw, 4rem);
    white-space: nowrap;
    word-break: keep-all;
    overflow-wrap: normal;
  }
}

.hero-lead {
  max-width: 690px;
  margin: 30px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 1.1rem;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  margin-top: 38px;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-flex;
  min-height: 54px;
  padding: 0 24px;
  align-items: center;
  justify-content: center;
  gap: 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 0.96rem;
  font-weight: 600;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button:active,
.nav-cta:active,
.contact-button:active,
.contact-actions > a:active,
.product-card:active,
.application-card:active {
  transform: scale(0.97);
  transition-duration: 90ms;
}

.button svg {
  width: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.button-primary {
  background: var(--red);
  color: var(--white);
}

.button-primary:hover {
  background: var(--red-dark);
}

.button-ghost {
  border-color: rgba(255, 255, 255, 0.35);
  color: var(--white);
}

.button-ghost:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

.hero-panel {
  border-top: 2px solid var(--red);
  overflow: hidden;
  border-right: 1px solid rgba(255, 255, 255, 0.13);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius-lg);
  background: rgba(8, 21, 38, 0.64);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.28), inset 0 1px rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(24px) saturate(140%);
}

.panel-kicker {
  border-bottom: 1px solid rgba(255, 255, 255, 0.11);
  padding: 19px 24px 16px;
  color: rgba(255, 255, 255, 0.46);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
}

.capability-row {
  display: grid;
  padding: 23px 24px;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.capability-row:last-child {
  border-bottom: 0;
}

.capability-row > span {
  color: var(--red);
  font-size: 0.75rem;
  font-weight: 700;
}

.capability-row div {
  display: grid;
  gap: 5px;
}

.capability-row strong {
  font-size: 0.96rem;
}

.capability-row small {
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.79rem;
}

.hero-scroll {
  position: absolute;
  z-index: 3;
  bottom: 27px;
  left: max(24px, calc((100vw - var(--container)) / 2));
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.42);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.hero-scroll span {
  position: relative;
  width: 54px;
  height: 1px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.25);
}

.hero-scroll span::after {
  position: absolute;
  inset: 0;
  background: var(--red);
  content: "";
  animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
  0% { transform: translateX(-100%); }
  50%, 100% { transform: translateX(100%); }
}

.metrics {
  position: relative;
  z-index: 4;
  margin-top: -44px;
  background: transparent;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
  border: 1px solid rgba(219, 226, 234, 0.9);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 24px 60px rgba(8, 21, 38, 0.12), inset 0 1px #fff;
  backdrop-filter: blur(20px) saturate(160%);
}

.metric {
  display: flex;
  min-height: 145px;
  padding: 30px 36px;
  flex-direction: column;
  justify-content: center;
  border-right: 1px solid var(--line);
}

.metric:first-child {
  border-left: 0;
}

.metric strong {
  color: var(--navy);
  font-size: 2.15rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.metric span {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.83rem;
}

.section {
  padding: 126px 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 55px;
}

.section-heading h2,
.about h2,
.service-copy h2,
.contact h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(2.3rem, 4vw, 4.25rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.14;
}

.section-heading > p:last-child,
.split-heading > p,
.about-copy > p,
.service-copy > p,
.contact-shell > div > p:last-child {
  color: var(--muted);
  line-height: 1.9;
}

.split-heading {
  display: grid;
  max-width: none;
  align-items: end;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 100px;
}

.split-heading .eyebrow {
  margin-bottom: 18px;
}

.split-heading > p {
  margin: 0 0 4px;
}

.products {
  background:
    radial-gradient(circle at 94% 8%, rgba(104, 210, 232, 0.1), transparent 22%),
    var(--paper);
}

.product-feature {
  display: grid;
  min-height: 550px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.86);
  border-radius: var(--radius-xl);
  background: var(--white);
  box-shadow: var(--shadow);
  grid-template-columns: 1.08fr 0.92fr;
}

.product-visual {
  position: relative;
  display: grid;
  min-height: 520px;
  overflow: hidden;
  place-items: center;
  background:
    linear-gradient(135deg, #e9edf2, #fff 58%),
    #eef1f5;
}

.product-visual::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(8, 21, 38, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 21, 38, 0.05) 1px, transparent 1px);
  background-size: 42px 42px;
  content: "";
}

.product-visual img {
  position: relative;
  z-index: 2;
  width: 86%;
  mix-blend-mode: multiply;
  transform:
    perspective(1000px)
    translate3d(var(--image-x, 0), var(--image-y, 8px), 0)
    rotateX(var(--image-rx, 0deg))
    rotateY(var(--image-ry, 0deg))
    scale(var(--image-scale, 1));
  transform-style: preserve-3d;
  will-change: transform;
}

.visual-ring {
  position: absolute;
  border: 1px solid rgba(202, 32, 39, 0.2);
  border-radius: 50%;
}

.ring-one {
  width: 490px;
  height: 490px;
}

.ring-two {
  width: 340px;
  height: 340px;
}

.product-badge {
  position: absolute;
  z-index: 3;
  top: 24px;
  left: 24px;
  background: var(--red);
  padding: 7px 13px;
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  border-radius: 9px;
}

.product-copy {
  padding: 68px 62px;
}

.index-label {
  margin: 0 0 20px;
  color: var(--red);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.13em;
}

.product-copy h3 {
  margin: 0;
  font-size: 2.55rem;
  letter-spacing: -0.04em;
}

.product-copy > p:nth-of-type(2) {
  margin: 20px 0 28px;
  color: var(--muted);
}

.spec-grid {
  display: grid;
  margin: 0 0 30px;
  grid-template-columns: 1fr 1fr;
}

.spec-grid div {
  padding: 16px 10px 16px 0;
  border-top: 1px solid var(--line);
}

.spec-grid dt {
  color: #8691a0;
  font-size: 0.75rem;
}

.spec-grid dd {
  margin: 5px 0 0;
  color: var(--navy);
  font-size: 0.92rem;
  font-weight: 700;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--red);
  font-size: 0.91rem;
  font-weight: 700;
}

.text-link span {
  transition: transform 0.2s ease;
}

.text-link:hover span {
  transform: translate(3px, -3px);
}

.product-grid {
  display: grid;
  margin-top: 26px;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.product-card {
  position: relative;
  min-height: 330px;
  background: var(--white);
  padding: 42px 36px;
  transition: background 0.25s ease, transform 0.25s ease;
}

.product-grid {
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 45px rgba(8, 21, 38, 0.08);
}

.product-card:hover {
  z-index: 1;
  background: var(--navy);
  color: var(--white);
  transform: translateY(-7px);
}

.card-no {
  position: absolute;
  top: 24px;
  right: 25px;
  color: #a2acb8;
  font-size: 0.72rem;
}

.card-icon {
  width: 52px;
  margin: 24px 0 34px;
  fill: none;
  stroke: var(--red);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.product-card h3 {
  margin: 0 0 14px;
  font-size: 1.35rem;
}

.product-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.9;
}

.product-card:hover p {
  color: rgba(255, 255, 255, 0.62);
}

.services {
  position: relative;
  overflow: hidden;
  background: var(--navy);
  color: var(--white);
}

.services::before {
  position: absolute;
  top: -220px;
  left: -120px;
  width: 520px;
  height: 520px;
  border: 1px solid rgba(104, 210, 232, 0.13);
  border-radius: 50%;
  box-shadow: 0 0 0 70px rgba(104, 210, 232, 0.025), 0 0 0 140px rgba(104, 210, 232, 0.02);
  content: "";
}

.service-layout {
  position: relative;
  z-index: 1;
  display: grid;
  align-items: center;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 95px;
}

.service-copy h2 {
  color: var(--white);
  font-size: clamp(2.5rem, 4.3vw, 4.8rem);
}

.service-copy > p {
  margin: 28px 0 40px;
  color: rgba(255, 255, 255, 0.63);
}

.service-list {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.service-list div {
  display: grid;
  padding: 19px 0;
  align-items: center;
  grid-template-columns: 52px 1fr;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.service-list span {
  color: var(--red);
  font-size: 0.73rem;
}

.service-list strong {
  font-size: 0.98rem;
  font-weight: 500;
}

.curve-card {
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.055);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px) saturate(140%);
}

.curve-image {
  position: relative;
  overflow: hidden;
  background: #fff;
  border-radius: 17px;
}

.curve-image img {
  width: 100%;
  min-height: 320px;
  object-fit: cover;
}

.curve-image span {
  position: absolute;
  bottom: 0;
  left: 0;
  background: var(--red);
  padding: 8px 14px;
  font-size: 0.74rem;
}

.standards {
  display: grid;
  padding: 26px 6px 5px;
  grid-template-columns: 140px 1fr;
  gap: 18px;
}

.standards p {
  margin: 3px 0 0;
  color: rgba(255, 255, 255, 0.46);
  font-size: 0.78rem;
}

.standards div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.standards span {
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 5px 10px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.72rem;
  border-radius: 999px;
}

.applications {
  background: var(--white);
}

.applications .section-heading > p:last-child {
  margin-top: 22px;
}

.application-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  grid-template-rows: 270px 270px;
  gap: 18px;
}

.application-card {
  position: relative;
  overflow: hidden;
  background: var(--navy);
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 45px rgba(8, 21, 38, 0.12);
}

.application-wide {
  grid-row: 1 / span 2;
}

.application-card::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(5, 14, 27, 0.95) 0%, rgba(5, 14, 27, 0.06) 66%);
  content: "";
}

.application-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.83) contrast(1.05);
  transition: transform 0.6s cubic-bezier(0.2, 0.7, 0.1, 1), filter 0.4s ease;
}

.application-wide img {
  object-position: 18% center;
}

.application-card:hover img {
  filter: saturate(1) contrast(1.05);
  transform: scale(1.045);
}

.application-overlay {
  position: absolute;
  z-index: 2;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 30px 32px;
  color: var(--white);
}

.application-overlay span {
  color: #e95a60;
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.application-overlay h3 {
  margin: 8px 0 6px;
  font-size: 1.55rem;
}

.application-overlay p {
  margin: 0;
  color: rgba(255, 255, 255, 0.58);
  font-size: 0.83rem;
}

.about {
  overflow: hidden;
  background: var(--paper);
}

.about-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 125px;
}

.about-copy > p {
  max-width: 520px;
  margin: 28px 0 32px;
}

.assurance-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.assurance-row span {
  border: 1px solid #ccd4de;
  background: rgba(255, 255, 255, 0.7);
  padding: 7px 12px;
  color: #4d5a6b;
  font-size: 0.76rem;
  border-radius: 999px;
}

.timeline {
  position: relative;
  border-top: 1px solid #cbd3dd;
}

.timeline::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 116px;
  width: 1px;
  background: #d6dce4;
  content: "";
}

.timeline-item {
  position: relative;
  display: grid;
  min-height: 94px;
  padding: 24px 0;
  align-items: center;
  grid-template-columns: 116px 1fr;
  border-bottom: 1px solid #cbd3dd;
}

.timeline-item::before {
  position: absolute;
  top: 50%;
  left: 111px;
  z-index: 1;
  width: 11px;
  height: 11px;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: #8290a1;
  content: "";
  transform: translateY(-50%);
}

.timeline-item.active::before {
  background: var(--red);
  box-shadow: 0 0 0 6px rgba(202, 32, 39, 0.13);
}

.timeline time {
  color: var(--navy);
  font-size: 1.25rem;
  font-weight: 800;
}

.timeline p {
  margin: 0;
  padding-left: 34px;
  color: var(--muted);
  font-size: 0.92rem;
}

.contact {
  position: relative;
  overflow: hidden;
  background: var(--red);
  padding: 92px 0;
  color: var(--white);
}

.contact::before,
.contact::after {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.17);
  border-radius: 50%;
  content: "";
}

.contact::before {
  top: -240px;
  right: -90px;
  width: 520px;
  height: 520px;
}

.contact::after {
  right: 30px;
  bottom: -350px;
  width: 620px;
  height: 620px;
}

.contact-shell {
  position: relative;
  z-index: 1;
  display: grid;
  align-items: center;
  grid-template-columns: 1fr 0.9fr;
  gap: 90px;
  padding: 56px 60px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: var(--radius-xl);
  background: rgba(150, 8, 14, 0.16);
  box-shadow: 0 28px 70px rgba(94, 0, 4, 0.22), inset 0 1px rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(18px) saturate(130%);
}

.contact .eyebrow {
  color: rgba(255, 255, 255, 0.65);
}

.contact .eyebrow span {
  background: var(--white);
}

.contact h2 {
  color: var(--white);
  font-size: clamp(2.3rem, 3.8vw, 4rem);
}

.contact-shell > div > p:last-child {
  max-width: 630px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.72);
}

.contact-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.contact-actions > a:not(.contact-button) {
  display: grid;
  padding: 19px 20px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  gap: 5px;
  transition: background 0.2s ease;
  border-radius: 13px;
}

.contact-actions > a:not(.contact-button):hover {
  background: rgba(255, 255, 255, 0.1);
}

.contact-actions small {
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.74rem;
}

.contact-actions strong {
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.contact-button {
  display: flex;
  min-height: 58px;
  padding: 0 21px;
  align-items: center;
  justify-content: space-between;
  grid-column: 1 / -1;
  background: var(--white);
  color: var(--red);
  font-weight: 700;
  border-radius: 13px;
  transition: background 0.2s ease, transform 0.2s ease;
}

.contact-button:hover {
  background: #f6f6f6;
  transform: translateY(-2px);
}

.site-footer {
  background: #050c16;
  padding: 38px 0;
  color: var(--white);
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-brand img {
  width: 42px;
  height: 48px;
  object-fit: cover;
  object-position: top;
}

.footer-brand div {
  display: grid;
  gap: 4px;
}

.footer-brand strong {
  font-size: 0.91rem;
}

.footer-brand span,
.footer-meta {
  color: rgba(255, 255, 255, 0.44);
  font-size: 0.73rem;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
}

.footer-meta a:hover {
  color: var(--white);
}

[data-reveal] {
  opacity: 0;
  filter: blur(5px);
  transform: translateY(20px) scale(0.992);
  transition:
    opacity 0.45s ease,
    filter 0.45s ease,
    transform 0.48s cubic-bezier(0.22, 0.61, 0.36, 1);
}

[data-reveal].revealed {
  opacity: 1;
  filter: blur(0);
  transform: translateY(0);
}

.scroll-progress {
  position: fixed;
  z-index: 1000;
  top: 0;
  right: 0;
  left: 0;
  height: 2px;
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #f56a6e, var(--red));
  box-shadow: 0 0 12px rgba(240, 75, 80, 0.6);
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: left;
  will-change: transform;
}

@media (max-width: 1000px) {
  .main-nav {
    gap: 20px;
  }

  .hero-content {
    grid-template-columns: 1fr 280px;
    gap: 40px;
  }

  .hero h1 {
    font-size: clamp(3.25rem, 6.4vw, 4.5rem);
  }

  .product-feature,
  .service-layout,
  .about-layout,
  .contact-shell {
    gap: 55px;
  }

  .product-copy {
    padding: 48px 38px;
  }

  .product-card {
    padding: 36px 28px;
  }
}

@media (max-width: 820px) {
  .container,
  .nav-shell {
    width: min(calc(100% - 36px), var(--container));
  }

  .nav-shell {
    height: 62px;
    padding: 0 12px;
  }

  .site-header.scrolled .nav-shell {
    width: calc(100% - 20px);
  }

  .brand img {
    width: 40px;
    height: 46px;
  }

  .menu-toggle {
    display: block;
    z-index: 3;
  }

  .brand {
    position: relative;
    z-index: 3;
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .main-nav {
    position: fixed;
    z-index: 2;
    inset: 6px;
    display: flex;
    visibility: hidden;
    flex-direction: column;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 28px;
    background: rgba(5, 12, 22, 0.88);
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.42), inset 0 1px rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(28px) saturate(160%);
    opacity: 0;
    transform: translateY(-12px) scale(0.97);
    transform-origin: top right;
    transition:
      opacity 0.25s ease,
      transform 0.32s cubic-bezier(0.22, 0.61, 0.36, 1),
      visibility 0.32s;
  }

  .main-nav.open {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  .main-nav > a:not(.nav-cta) {
    padding: 9px 0;
    font-size: 1.35rem;
  }

  .main-nav > a:not(.nav-cta)::after {
    bottom: 3px;
  }

  .nav-cta {
    margin-top: 20px;
    padding: 12px 28px;
  }

  .hero {
    min-height: 760px;
  }

  .hero-media {
    background:
      linear-gradient(90deg, rgba(5, 14, 27, 0.96), rgba(5, 14, 27, 0.63)),
      linear-gradient(0deg, rgba(7, 16, 30, 0.85), transparent 55%),
      url("./assets/hero-furnace.webp") 62% center / cover no-repeat;
  }

  .hero-content {
    padding-top: 90px;
    grid-template-columns: 1fr;
  }

  .hero-panel {
    display: none;
  }

  .hero-copy {
    max-width: 680px;
  }

  .metric-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .metric:nth-child(3) {
    border-left: 1px solid var(--line);
  }

  .metric:nth-child(-n+2) {
    border-bottom: 1px solid var(--line);
  }

  .section {
    padding: 90px 0;
  }

  .split-heading,
  .product-feature,
  .service-layout,
  .about-layout,
  .contact-shell {
    grid-template-columns: 1fr;
  }

  .split-heading {
    gap: 20px;
  }

  .product-visual {
    min-height: 430px;
  }

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

  .product-card {
    min-height: 260px;
  }

  .service-layout,
  .about-layout {
    gap: 65px;
  }

  .application-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 380px 280px;
  }

  .application-wide {
    grid-column: 1 / -1;
    grid-row: auto;
  }

  .contact-shell {
    gap: 44px;
    padding: 42px;
  }
}

@media (max-width: 560px) {
  .container,
  .nav-shell {
    width: min(calc(100% - 30px), var(--container));
  }

  .brand-copy strong {
    font-size: 0.98rem;
  }

  .brand-copy small {
    font-size: 0.56rem;
  }

  .hero {
    min-height: 720px;
  }

  .hero h1 {
    font-size: clamp(2.75rem, 13vw, 4rem);
    letter-spacing: -0.06em;
  }

  .hero-lead {
    font-size: 1rem;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .hero-scroll {
    left: 15px;
  }

  .metric {
    min-height: 112px;
    padding: 22px 18px;
  }

  .metric strong {
    font-size: 1.75rem;
  }

  .section {
    padding: 76px 0;
  }

  .section-heading {
    margin-bottom: 38px;
  }

  .section-heading h2,
  .about h2,
  .service-copy h2,
  .contact h2 {
    font-size: 2.2rem;
  }

  .product-visual {
    min-height: 300px;
  }

  .ring-one {
    width: 300px;
    height: 300px;
  }

  .ring-two {
    width: 210px;
    height: 210px;
  }

  .product-copy {
    padding: 38px 24px;
  }

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

  .product-card {
    padding: 32px 24px;
  }

  .curve-card {
    padding: 12px;
  }

  .curve-image img {
    min-height: 230px;
  }

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

  .application-grid {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: repeat(3, 300px);
  }

  .application-wide {
    grid-column: auto;
  }

  .application-overlay {
    padding: 24px;
  }

  .timeline::before {
    left: 78px;
  }

  .timeline-item {
    grid-template-columns: 78px 1fr;
  }

  .timeline-item::before {
    left: 73px;
  }

  .timeline p {
    padding-left: 25px;
  }

  .contact {
    padding: 74px 0;
  }

  .contact-shell {
    padding: 34px 22px;
  }

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

  .contact-button {
    grid-column: auto;
  }

  .footer-grid,
  .footer-meta {
    align-items: flex-start;
    flex-direction: column;
    justify-content: flex-start;
  }
}

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

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

  [data-reveal] {
    opacity: 1;
    filter: none;
    transform: none;
  }

  .hero-media,
  .product-visual img {
    transform: none !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header.scrolled .nav-shell,
  .hero-panel,
  .curve-card,
  .contact-shell,
  .metric-grid,
  .main-nav {
    backdrop-filter: none;
  }

  .site-header.scrolled .nav-shell,
  .main-nav {
    background: #07101e;
  }

  .hero-panel,
  .curve-card {
    background: #10243e;
  }

  .metric-grid {
    background: #fff;
  }
}

@media (prefers-contrast: more) {
  .site-header.scrolled .nav-shell,
  .hero-panel,
  .curve-card,
  .main-nav {
    border-color: #fff;
    background: #07101e;
  }

  .button,
  .nav-cta,
  .product-feature,
  .product-grid,
  .application-card,
  .contact-shell {
    border-width: 2px;
  }
}