:root {
  --ink: #14212b;
  --muted: #62717e;
  --line: #dce5e8;
  --paper: #ffffff;
  --soft: #f3f7f5;
  --teal: #11a8bd;
  --teal-deep: #087989;
  --coral: #d94f3d;
  --amber: #d99d35;
  --green: #567b5b;
  --shadow: 0 18px 42px rgba(23, 40, 48, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family:
    "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background: var(--paper);
  letter-spacing: 0;
}

body.is-lightbox-open {
  overflow: hidden;
}

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

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

button,
input,
textarea {
  font: inherit;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  min-height: 74px;
  padding: 12px 34px;
  color: #ffffff;
  background: rgba(16, 30, 36, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  transition:
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 10px 28px rgba(18, 35, 44, 0.1);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 196px;
}

.brand img {
  width: 50px;
  height: 50px;
  object-fit: contain;
  border-radius: 6px;
  background: #ffffff;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.1;
}

.brand strong {
  font-size: 1rem;
}

.brand small {
  margin-top: 3px;
  color: currentColor;
  opacity: 0.72;
  font-size: 0.72rem;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  font-size: 0.94rem;
  white-space: nowrap;
}

.main-nav a {
  opacity: 0.86;
}

.main-nav a:hover {
  opacity: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-switch,
.header-call,
.menu-button,
.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  border-radius: 8px;
}

.lang-switch,
.menu-button {
  width: 42px;
  padding: 0;
  color: currentColor;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.28);
  cursor: pointer;
}

.site-header.is-scrolled .lang-switch,
.site-header.is-open .lang-switch,
.site-header.is-scrolled .menu-button,
.site-header.is-open .menu-button {
  background: #edf5f6;
  border-color: #d5e7eb;
}

.lang-switch span {
  font-size: 0.72rem;
  font-weight: 800;
}

.header-call {
  padding: 0 15px;
  color: #ffffff;
  background: var(--coral);
  font-weight: 700;
}

.menu-button {
  display: none;
}

[data-lucide],
.lucide {
  width: 18px;
  height: 18px;
  stroke-width: 2.2;
}

.hero {
  position: relative;
  min-height: 80vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 142px 34px 80px;
  color: #ffffff;
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(13, 28, 34, 0.82), rgba(13, 28, 34, 0.42) 46%, rgba(13, 28, 34, 0.08)),
    linear-gradient(0deg, rgba(13, 28, 34, 0.36), rgba(13, 28, 34, 0.04) 46%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
  margin: 0 auto;
  margin-left: max(0px, calc((100vw - 1180px) / 2));
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #88edf5;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 20px;
  font-size: 3.65rem;
  line-height: 1.06;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: 2.25rem;
  line-height: 1.16;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.08rem;
  line-height: 1.28;
}

p {
  color: var(--muted);
  line-height: 1.75;
}

.hero-copy {
  max-width: 660px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.12rem;
}

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

.primary-action,
.secondary-action {
  padding: 0 20px;
  border: 1px solid transparent;
  font-weight: 800;
}

.primary-action {
  color: #ffffff;
  background: var(--coral);
  box-shadow: 0 16px 30px rgba(167, 50, 37, 0.26);
}

.secondary-action {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.32);
}

.section {
  padding: 92px 34px;
}

.intro-band,
.muted-section,
.spec-band {
  background: var(--soft);
}

.section-grid,
.section-heading,
.spec-layout,
.process-list,
.site-footer {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 54px;
  align-items: center;
}

.copy-block p {
  max-width: 650px;
}

.image-panel,
.spec-layout figure {
  margin: 0;
}

.image-panel img,
.spec-layout img,
.product-card img {
  width: 100%;
  border-radius: 8px;
  object-fit: cover;
}

.image-panel {
  position: relative;
}

.image-panel img {
  aspect-ratio: 4 / 3;
}

figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.86rem;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
  text-align: center;
}

.section-heading p:not(.section-kicker) {
  margin-bottom: 0;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.product-card,
.application-grid article,
.advantage-grid article,
.process-list li,
.quote-form {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.product-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  overflow: hidden;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease;
}

.product-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.product-media-button {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  overflow: hidden;
  background: transparent;
  border: 0;
  cursor: zoom-in;
}

.product-media-button::after {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 7px 10px;
  color: #ffffff;
  background: rgba(12, 26, 31, 0.74);
  border-radius: 8px;
  content: attr(data-view-label);
  font-size: 0.78rem;
  font-weight: 800;
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.product-media-button:hover::after,
.product-media-button:focus-visible::after {
  opacity: 1;
  transform: translateY(0);
}

.product-media-button:focus-visible {
  outline: 3px solid rgba(17, 168, 189, 0.5);
  outline-offset: -3px;
}

.product-card img {
  aspect-ratio: 16 / 11;
  border-radius: 0;
  transition: transform 220ms ease;
}

.product-media-button:hover img,
.product-media-button:focus-visible img {
  transform: scale(1.035);
}

.product-card div {
  display: flex;
  min-height: 212px;
  flex: 1;
  flex-direction: column;
  padding: 18px;
}

.product-card p {
  flex: 1;
  margin-bottom: 14px;
  font-size: 0.93rem;
}

.product-card span {
  display: inline-flex;
  align-self: flex-start;
  padding: 7px 10px;
  color: var(--teal-deep);
  background: #e9f7f8;
  border: 1px solid #c7eef2;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 800;
}

.application-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.application-grid article {
  min-height: 230px;
  padding: 24px;
}

.application-grid i,
.advantage-grid i {
  width: 38px;
  height: 38px;
  margin-bottom: 18px;
  color: var(--coral);
}

.application-grid p,
.advantage-grid p,
.process-list p {
  margin-bottom: 0;
  font-size: 0.92rem;
}

.engineering-grid {
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
}

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

.advantage-grid article {
  min-height: 178px;
  padding: 20px;
}

.spec-band {
  padding-top: 84px;
}

.spec-layout {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.spec-layout img {
  aspect-ratio: 4 / 3;
}

.options-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  width: min(980px, 100%);
  margin: 34px auto 0;
}

.options-row span {
  padding: 9px 13px;
  color: #24414a;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 700;
}

.image-lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 28px;
}

.image-lightbox[hidden] {
  display: none;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(9, 18, 22, 0.82);
  border: 0;
  cursor: zoom-out;
}

.lightbox-dialog {
  position: relative;
  z-index: 1;
  width: min(980px, 100%);
  max-height: calc(100vh - 56px);
  margin: 0;
  overflow: hidden;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
}

.lightbox-dialog img {
  width: 100%;
  max-height: min(68vh, 680px);
  object-fit: contain;
  background: #eef4f4;
}

.lightbox-dialog figcaption {
  margin: 0;
  padding: 18px 22px 20px;
}

.lightbox-dialog h3 {
  margin-bottom: 6px;
}

.lightbox-dialog p {
  margin-bottom: 0;
}

.lightbox-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  color: #ffffff;
  background: rgba(12, 26, 31, 0.74);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  cursor: pointer;
}

.process-section {
  padding-bottom: 100px;
}

.process-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  padding: 0;
  list-style: none;
}

.process-list li {
  min-height: 205px;
  padding: 24px;
}

.process-list span {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--amber);
  font-size: 1.5rem;
  font-weight: 900;
}

.contact-section {
  position: relative;
  min-height: 620px;
  overflow: hidden;
  padding: 90px 34px;
  color: #ffffff;
}

.contact-section > img,
.contact-overlay {
  position: absolute;
  inset: 0;
}

.contact-section > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.contact-overlay {
  background:
    linear-gradient(90deg, rgba(12, 26, 31, 0.88), rgba(12, 26, 31, 0.64), rgba(12, 26, 31, 0.3)),
    rgba(12, 26, 31, 0.2);
}

.contact-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 420px);
  gap: 48px;
  align-items: start;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.contact-content h2 {
  max-width: 560px;
  color: #ffffff;
}

.contact-content p {
  max-width: 620px;
  color: rgba(255, 255, 255, 0.82);
}

.quote-form {
  display: grid;
  gap: 16px;
  padding: 22px;
  color: var(--ink);
  box-shadow: var(--shadow);
}

.quote-form label span {
  display: block;
  margin-bottom: 8px;
  font-size: 0.86rem;
  font-weight: 800;
}

.quote-form input,
.quote-form select,
.quote-form textarea {
  width: 100%;
  padding: 12px 13px;
  color: var(--ink);
  background: #f8fbfb;
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
  resize: vertical;
}

.quote-form input:focus,
.quote-form select:focus,
.quote-form textarea:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(17, 168, 189, 0.14);
}

.form-honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.checkbox-field {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 10px;
  align-items: start;
}

.quote-form .checkbox-field input {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--teal-deep);
}

.quote-form .checkbox-field span {
  margin-bottom: 0;
  color: var(--muted);
  font-weight: 700;
  line-height: 1.5;
}

.turnstile-box {
  min-height: 65px;
}

.form-button {
  width: 100%;
  border: 0;
  cursor: pointer;
}

.form-button:disabled {
  cursor: wait;
  opacity: 0.68;
}

.quote-form .form-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.quote-form .form-note.is-error {
  color: var(--coral);
  font-weight: 700;
}

.quote-form .form-note.is-success {
  color: var(--teal-deep);
  font-weight: 700;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 28px 34px;
}

.site-footer p {
  margin: 6px 0 0;
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
  color: var(--teal-deep);
  font-weight: 800;
}

.success-page {
  min-height: 100vh;
  background:
    linear-gradient(120deg, rgba(8, 121, 137, 0.82), rgba(20, 33, 43, 0.72)),
    url("assets/site-hero-tent.jpg") center / cover;
}

.success-shell {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 34px;
}

.success-brand {
  position: absolute;
  top: 24px;
  left: 34px;
  color: #ffffff;
}

.success-panel {
  width: min(620px, 100%);
  padding: 42px;
  text-align: center;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.62);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.success-panel > .lucide {
  width: 54px;
  height: 54px;
  margin-bottom: 18px;
  color: var(--teal-deep);
}

.success-panel h1 {
  margin-bottom: 14px;
  font-size: 2.35rem;
  color: var(--ink);
}

.success-panel p {
  margin-bottom: 14px;
}

.success-panel .success-en {
  margin-bottom: 26px;
  font-size: 0.96rem;
}

.success-panel .primary-action {
  width: auto;
}

@media (max-width: 1080px) {
  .main-nav {
    gap: 16px;
  }

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

  .advantage-grid,
  .spec-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 900px) {
  .site-header {
    padding: 12px 18px;
  }

  .main-nav {
    position: fixed;
    top: 74px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 18px 18px;
    color: var(--ink);
    background: #ffffff;
    border-bottom: 1px solid var(--line);
  }

  .site-header.is-open .main-nav {
    display: flex;
  }

  .main-nav a {
    padding: 14px 8px;
    border-bottom: 1px solid var(--line);
  }

  .header-call span {
    display: none;
  }

  .header-call {
    width: 42px;
    padding: 0;
  }

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

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

  h1 {
    font-size: 2.55rem;
  }

  h2 {
    font-size: 1.85rem;
  }

}

@media (max-width: 640px) {
  .brand {
    min-width: 0;
  }

  .brand strong {
    font-size: 0.92rem;
  }

  .brand small {
    display: none;
  }

  .hero {
    min-height: 78vh;
    padding: 118px 20px 66px;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(13, 28, 34, 0.88), rgba(13, 28, 34, 0.5)),
      linear-gradient(0deg, rgba(13, 28, 34, 0.42), rgba(13, 28, 34, 0.08));
  }

  .hero-inner {
    margin-left: 0;
  }

  h1 {
    font-size: 2.2rem;
  }

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

  .hero-actions,
  .primary-action,
  .secondary-action {
    width: 100%;
  }

  .section,
  .contact-section {
    padding: 68px 20px;
  }

  .image-lightbox {
    padding: 14px;
  }

  .lightbox-dialog {
    max-height: calc(100vh - 28px);
  }

  .lightbox-dialog figcaption {
    padding: 16px;
  }

  .product-grid,
  .application-grid,
  .advantage-grid,
  .spec-layout,
  .process-list {
    grid-template-columns: 1fr;
  }

  .product-card div {
    min-height: auto;
  }

  .application-grid article,
  .advantage-grid article,
  .process-list li {
    min-height: auto;
  }

  .quote-form {
    padding: 18px;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    padding: 26px 20px;
  }

  .footer-links {
    justify-content: flex-start;
  }
}