:root {
  --ink: #16202b;
  --muted: #667085;
  --line: #dce3ea;
  --paper: #ffffff;
  --mist: #f3f6f8;
  --teal: #14a6a4;
  --cyan: #2bb7d4;
  --blue: #0d4c92;
  --amber: #c08b2c;
  --graphite: #26313d;
  --shadow: 0 22px 70px rgba(25, 34, 44, 0.13);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family:
    "Microsoft YaHei",
    "PingFang SC",
    "Noto Sans SC",
    Arial,
    sans-serif;
  line-height: 1.7;
  background: var(--paper);
}

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

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  display: flex;
  width: 100%;
  min-height: 74px;
  align-items: center;
  justify-content: space-between;
  padding: 0 5vw;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  transition:
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.site-header.scrolled,
.site-header.menu-open {
  color: var(--ink);
  border-color: rgba(22, 32, 43, 0.08);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 14px 45px rgba(14, 24, 35, 0.08);
  backdrop-filter: blur(18px);
}

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

.brand img {
  width: 44px;
  height: 44px;
  object-fit: cover;
  border-radius: 8px;
}

.brand span {
  display: grid;
  min-width: 0;
}

.brand strong {
  overflow: hidden;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand small {
  color: currentColor;
  font-size: 11px;
  letter-spacing: 0;
  opacity: 0.68;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.3vw, 36px);
  font-size: 14px;
  font-weight: 600;
}

.site-nav a {
  position: relative;
  padding: 25px 0;
  opacity: 0.88;
}

.site-nav a::after {
  position: absolute;
  bottom: 20px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--teal);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.site-nav a:hover::after {
  transform: scaleX(1);
}

.nav-contact {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 0 18px !important;
  color: #fff;
  border-radius: 4px;
  background: var(--teal);
}

.nav-contact::after {
  display: none;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  gap: 5px;
  flex-direction: column;
}

.site-header.scrolled .menu-toggle,
.site-header.menu-open .menu-toggle {
  border-color: rgba(22, 32, 43, 0.18);
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background: currentColor;
}

.hero {
  position: relative;
  display: flex;
  min-height: 92vh;
  align-items: center;
  overflow: hidden;
  color: #fff;
  isolation: isolate;
  background:
    linear-gradient(90deg, rgba(16, 26, 37, 0.94), rgba(18, 34, 49, 0.76) 44%, rgba(18, 34, 49, 0.18)),
    #1f2a35;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(18, 29, 42, 0.86), rgba(18, 29, 42, 0.24)),
    url("assets/machine-double.jpg") right 8vw center / min(760px, 54vw) auto no-repeat,
    linear-gradient(135deg, #24313f, #eef3f4);
}

.hero-media::after {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 76px 76px;
  content: "";
  mask-image: linear-gradient(90deg, #000 0%, transparent 72%);
}

.hero-overlay {
  position: absolute;
  right: 4vw;
  bottom: 7vh;
  z-index: -1;
  width: min(520px, 42vw);
  height: 10px;
  background: rgba(20, 166, 164, 0.72);
  box-shadow: 0 22px 80px rgba(20, 166, 164, 0.38);
}

.hero-inner {
  width: min(1180px, 90vw);
  margin: 0 auto;
  padding-top: 86px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #4dd6dc;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1 {
  max-width: 780px;
  margin-bottom: 22px;
  font-size: 64px;
  font-weight: 760;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 640px;
  margin-bottom: 34px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 52px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 700;
}

.button-primary {
  color: #fff;
  background: var(--teal);
  box-shadow: 0 12px 34px rgba(20, 166, 164, 0.28);
}

.button-secondary {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.34);
  background: rgba(255, 255, 255, 0.08);
}

.hero-metrics {
  display: grid;
  max-width: 720px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  border-left: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-metrics div {
  padding: 20px 22px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.055);
}

.hero-metrics dt {
  margin-bottom: 2px;
  color: #fff;
  font-size: 36px;
  font-weight: 760;
  line-height: 1.1;
}

.hero-metrics dd {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 13px;
}

.section {
  padding: clamp(68px, 8vw, 112px) 5vw;
}

.section-heading {
  width: min(1180px, 100%);
  margin: 0 auto 34px;
}

.section-heading h2 {
  max-width: 760px;
  margin-bottom: 0;
  font-size: 42px;
  line-height: 1.22;
  letter-spacing: 0;
}

.intro {
  padding-top: 58px;
  background: var(--paper);
}

.intro-grid {
  display: grid;
  width: min(1180px, 100%);
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0 auto;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.intro-item {
  min-height: 230px;
  padding: 34px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.item-index {
  display: block;
  margin-bottom: 42px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 800;
}

.intro-item h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

.intro-item p {
  margin-bottom: 0;
  color: var(--muted);
}

.products {
  background: var(--mist);
}

.product-switch {
  display: flex;
  width: min(1180px, 100%);
  margin: 0 auto 26px;
  border-bottom: 1px solid #ccd6df;
  gap: 4px;
}

.product-switch button {
  position: relative;
  min-height: 52px;
  padding: 0 28px;
  color: var(--muted);
  border: 0;
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-weight: 800;
}

.product-switch button::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 3px;
  background: var(--teal);
  content: "";
  transform: scaleX(0);
  transition: transform 160ms ease;
}

.product-switch button.active {
  color: var(--ink);
}

.product-switch button.active::after {
  transform: scaleX(1);
}

.product-panel {
  display: none;
  width: min(1180px, 100%);
  grid-template-columns: minmax(320px, 42%) minmax(0, 1fr);
  align-items: stretch;
  margin: 0 auto;
  background: #fff;
  box-shadow: var(--shadow);
}

.product-panel.active {
  display: grid;
}

.product-visual {
  display: grid;
  min-height: 640px;
  align-items: center;
  padding: clamp(32px, 5vw, 64px);
  border-right: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(43, 183, 212, 0.1), transparent 46%),
    #f8fafb;
}

.product-visual img {
  width: 100%;
  max-height: 520px;
  object-fit: contain;
  filter: drop-shadow(0 24px 28px rgba(18, 32, 43, 0.12));
}

.product-content {
  padding: clamp(34px, 5vw, 58px);
}

.product-kicker {
  margin-bottom: 10px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.product-content h3 {
  margin-bottom: 14px;
  font-size: 36px;
  line-height: 1.2;
}

.product-content > p {
  max-width: 680px;
  color: var(--muted);
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 30px 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.spec-grid div {
  display: grid;
  min-height: 92px;
  align-content: center;
  padding: 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  gap: 4px;
}

.spec-grid strong {
  font-size: 13px;
  color: var(--muted);
}

.spec-grid span {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
}

.detail-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.detail-columns h4 {
  margin-bottom: 12px;
  font-size: 18px;
}

.detail-columns ul,
.qualification-copy ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-columns li,
.qualification-copy li {
  position: relative;
  margin-bottom: 10px;
  padding-left: 18px;
  color: var(--muted);
}

.detail-columns li::before,
.qualification-copy li::before {
  position: absolute;
  top: 0.78em;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--teal);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.environment {
  background:
    linear-gradient(180deg, #ffffff, #f8fafb 72%),
    var(--paper);
}

.environment-grid {
  display: grid;
  width: min(1180px, 100%);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0 auto;
  gap: 24px;
}

.parameter-list {
  padding: clamp(28px, 4vw, 42px);
  border: 1px solid var(--line);
  background: #fff;
}

.parameter-list h3 {
  margin-bottom: 22px;
  font-size: 24px;
}

.parameter-list dl {
  margin: 0;
}

.parameter-list dl div {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  padding: 15px 0;
  border-top: 1px solid var(--line);
  gap: 24px;
}

.parameter-list dt {
  color: var(--muted);
  font-weight: 700;
}

.parameter-list dd {
  margin: 0;
  font-weight: 700;
}

.applications {
  background: #fff;
}

.application-grid {
  display: grid;
  width: min(1180px, 100%);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0 auto;
  gap: 24px;
}

.application-card {
  display: grid;
  grid-template-columns: minmax(150px, 36%) minmax(0, 1fr);
  align-items: center;
  min-height: 310px;
  border: 1px solid var(--line);
  background: #fff;
}

.application-image {
  display: grid;
  height: 100%;
  min-height: 310px;
  place-items: center;
  padding: 28px;
  background: #f8fafb;
}

.application-image img {
  max-height: 230px;
  object-fit: contain;
}

.application-card div:last-child {
  padding: 30px;
}

.application-card span {
  display: block;
  margin-bottom: 8px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.application-card h3 {
  margin-bottom: 12px;
  font-size: 30px;
}

.application-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.advantages {
  color: #fff;
  background:
    linear-gradient(90deg, rgba(25, 35, 45, 0.98), rgba(25, 35, 45, 0.88)),
    url("assets/machine-single.png") right 6vw center / min(500px, 40vw) auto no-repeat,
    var(--graphite);
}

.advantages .section-heading h2,
.advantages .advantage-copy {
  color: #fff;
}

.advantage-layout {
  display: grid;
  width: min(1180px, 100%);
  grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.2fr);
  margin: 0 auto;
  gap: clamp(32px, 6vw, 74px);
}

.advantage-copy p {
  margin-bottom: 20px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 17px;
}

.process-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  border-left: 1px solid rgba(255, 255, 255, 0.18);
  list-style: none;
}

.process-list li {
  min-height: 210px;
  padding: 28px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.045);
}

.process-list span {
  display: block;
  margin-bottom: 32px;
  color: var(--amber);
  font-weight: 800;
}

.process-list strong {
  display: block;
  margin-bottom: 8px;
  font-size: 21px;
}

.process-list p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.72);
}

.qualification {
  background: #f8fafb;
}

.qualification-layout {
  display: grid;
  width: min(1180px, 100%);
  grid-template-columns: minmax(280px, 0.86fr) minmax(0, 1fr);
  align-items: center;
  margin: 0 auto;
  gap: clamp(28px, 6vw, 72px);
}

.license-frame {
  display: grid;
  min-height: 430px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
}

.license-frame img {
  width: 92%;
  max-height: 500px;
  object-fit: contain;
  transform: rotate(-90deg) scale(0.72);
}

.qualification-copy h3 {
  margin-bottom: 14px;
  font-size: 34px;
}

.qualification-copy p {
  color: var(--muted);
}

.qualification-copy li {
  color: var(--ink);
  font-weight: 700;
}

.contact {
  padding: clamp(56px, 7vw, 88px) 5vw;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(20, 166, 164, 0.95), rgba(13, 76, 146, 0.92)),
    var(--teal);
}

.contact .eyebrow {
  color: rgba(255, 255, 255, 0.78);
}

.contact-inner {
  display: grid;
  width: min(1180px, 100%);
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.72fr);
  align-items: center;
  margin: 0 auto;
  gap: 40px;
}

.contact h2 {
  margin-bottom: 14px;
  font-size: 44px;
}

.contact p {
  max-width: 720px;
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.8);
}

.contact-cards {
  display: grid;
  gap: 14px;
}

.contact-cards a {
  display: grid;
  min-height: 98px;
  align-content: center;
  padding: 22px 26px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.12);
}

.contact-cards span {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.contact-cards strong {
  font-size: 30px;
  line-height: 1.2;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 26px 5vw;
  color: #8792a0;
  background: #111923;
  font-size: 14px;
}

.site-footer a {
  color: #fff;
}

@media (max-width: 980px) {
  .site-header {
    min-height: 66px;
    padding: 0 22px;
  }

  .brand strong {
    max-width: 210px;
    font-size: 14px;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 66px;
    right: 18px;
    left: 18px;
    display: none;
    padding: 14px;
    border: 1px solid rgba(22, 32, 43, 0.08);
    background: #fff;
    box-shadow: var(--shadow);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 13px 8px;
    color: var(--ink);
  }

  .site-nav a::after {
    bottom: 8px;
  }

  .nav-contact {
    justify-content: center;
    margin-top: 8px;
    padding: 0 16px !important;
  }

  .hero {
    min-height: 88vh;
  }

  .hero-media {
    background:
      linear-gradient(180deg, rgba(18, 29, 42, 0.96), rgba(18, 29, 42, 0.72)),
      url("assets/machine-double.jpg") center bottom 8vh / min(520px, 82vw) auto no-repeat,
      linear-gradient(135deg, #24313f, #e9eff2);
  }

  .hero-overlay {
    right: 8vw;
    width: 70vw;
  }

  .hero-inner {
    padding-top: 88px;
    padding-bottom: 260px;
  }

  .hero-metrics,
  .intro-grid,
  .environment-grid,
  .application-grid,
  .advantage-layout,
  .qualification-layout,
  .contact-inner {
    grid-template-columns: 1fr;
  }

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

  .product-visual {
    min-height: 420px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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

  .advantages {
    background:
      linear-gradient(90deg, rgba(25, 35, 45, 0.98), rgba(25, 35, 45, 0.9)),
      var(--graphite);
  }
}

@media (max-width: 680px) {
  .section {
    padding: 58px 20px;
  }

  .hero-inner {
    width: calc(100% - 40px);
    padding-bottom: 230px;
  }

  h1 {
    font-size: 38px;
  }

  .hero-copy {
    font-size: 16px;
  }

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

  .hero-metrics div {
    padding: 16px 18px;
  }

  .section-heading h2 {
    font-size: 28px;
  }

  .product-content h3,
  .qualification-copy h3 {
    font-size: 28px;
  }

  .contact h2 {
    font-size: 30px;
  }

  .contact-cards strong {
    font-size: 24px;
  }

  .intro-item {
    min-height: auto;
    padding: 26px;
  }

  .item-index,
  .process-list span {
    margin-bottom: 20px;
  }

  .product-switch {
    overflow-x: auto;
  }

  .product-switch button {
    flex: 0 0 auto;
    padding: 0 20px;
  }

  .product-content {
    padding: 28px 22px;
  }

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

  .parameter-list dl div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

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

  .application-image {
    min-height: 240px;
  }

  .license-frame {
    min-height: 320px;
  }

  .license-frame img {
    width: 105%;
    transform: rotate(-90deg) scale(0.58);
  }

  .contact {
    padding: 56px 20px;
  }

  .site-footer {
    display: grid;
    gap: 10px;
    padding: 22px 20px;
  }
}