:root {
  --ink: #172027;
  --muted: #61717d;
  --line: #d9e1e5;
  --paper: #f7f9f8;
  --white: #ffffff;
  --teal: #0e837c;
  --teal-dark: #0a5955;
  --amber: #d69a2d;
  --charcoal: #263037;
  --shadow: 0 18px 55px rgba(19, 28, 35, 0.14);
  --max: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

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

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

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  flex-shrink: 0;
}

.lang-switch a {
  min-width: 48px;
  padding: 4px 8px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  text-align: center;
}

.lang-switch .language-cta {
  color: var(--ink);
  background: var(--amber);
  border-color: var(--amber);
}

.lang-switch a[aria-current="page"] {
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  width: 100%;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 54px);
  color: var(--white);
  transition: background 180ms ease, box-shadow 180ms ease, color 180ms ease;
}

.site-header.is-scrolled {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 30px rgba(24, 33, 41, 0.12);
  backdrop-filter: blur(18px);
}

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

.brand-mark {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 8px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand strong,
.brand em {
  display: block;
  font-style: normal;
  line-height: 1.2;
}

.brand strong {
  font-size: 16px;
  white-space: nowrap;
}

.brand em {
  margin-top: 3px;
  color: currentColor;
  font-size: 12px;
  opacity: 0.72;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
  transition: background 160ms ease;
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.16);
}

.site-header.is-scrolled .site-nav a:hover {
  background: rgba(14, 131, 124, 0.1);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid currentColor;
  border-radius: 8px;
  color: inherit;
  background: transparent;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: var(--white);
}

.hero-image,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-image {
  object-fit: cover;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(10, 18, 25, 0.86) 0%, rgba(10, 18, 25, 0.62) 34%, rgba(10, 18, 25, 0.1) 70%),
    linear-gradient(0deg, rgba(10, 18, 25, 0.72) 0%, rgba(10, 18, 25, 0) 42%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
  padding: 128px 0 92px;
}

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

.hero h1 {
  max-width: 1040px;
  margin: 0;
  font-size: 82px;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 650px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(17px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 12px 20px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

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

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

.button-secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.38);
  background: rgba(255, 255, 255, 0.08);
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  width: min(820px, 100%);
  margin: 72px 0 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(18px);
}

.hero-facts div {
  padding: 20px;
  background: rgba(11, 20, 27, 0.26);
}

.hero-facts dt {
  margin: 0 0 5px;
  color: var(--white);
  font-size: 28px;
  font-weight: 900;
  line-height: 1;
}

.hero-facts dd {
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
  font-size: 13px;
}

.section {
  padding: clamp(64px, 9vw, 116px) 0;
}

.section-inner {
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
}

.intro {
  padding-top: 36px;
  padding-bottom: 36px;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(240px, 0.7fr) minmax(0, 1fr);
  gap: 36px;
  align-items: center;
}

.intro h2,
.section-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.16;
  letter-spacing: 0;
}

.intro p:last-child,
.section-heading p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 34px;
  text-align: center;
}

.section-heading.left {
  margin-right: 0;
  margin-left: 0;
  text-align: left;
}

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

.media-section {
  background: var(--paper);
}

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

.media-card {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 8px 30px rgba(18, 28, 35, 0.05);
}

.media-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.media-card figcaption {
  display: grid;
  gap: 8px;
  padding: 18px;
}

.media-card strong {
  font-size: 18px;
}

.media-card span {
  color: var(--muted);
}

.service-card,
.spec-cards article,
.proof-item {
  min-height: 235px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 8px 30px rgba(18, 28, 35, 0.05);
}

.service-index {
  color: var(--amber);
  font-size: 13px;
  font-weight: 900;
}

.service-card h3,
.spec-cards h3,
.proof-item h3,
.timeline h3 {
  margin: 14px 0 10px;
  color: var(--ink);
  font-size: 20px;
  line-height: 1.25;
}

.service-card p,
.spec-cards p,
.proof-item p,
.timeline p {
  margin: 0;
  color: var(--muted);
}

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

.spec-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 8px 30px rgba(18, 28, 35, 0.05);
}

.spec-table {
  width: 100%;
  min-width: 820px;
  border-collapse: collapse;
}

.spec-table th,
.spec-table td {
  padding: 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.spec-table th {
  color: var(--white);
  background: var(--charcoal);
  font-size: 14px;
}

.spec-table td {
  color: var(--muted);
  background: var(--white);
}

.spec-table tr:last-child td {
  border-bottom: 0;
}

.spec-table td:first-child {
  color: var(--ink);
  font-weight: 900;
}

.spec-cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.spec-cards article {
  min-height: 180px;
  border-top: 4px solid var(--amber);
}

.process,
.contact {
  background: var(--charcoal);
  color: var(--white);
}

.process .section-heading h2,
.contact h2 {
  color: var(--white);
}

.process .section-heading p,
.contact p,
.contact address span {
  color: rgba(255, 255, 255, 0.72);
}

.process-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  gap: 48px;
  align-items: start;
}

.timeline {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 18px;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.timeline span {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
  color: var(--ink);
  background: var(--amber);
  font-weight: 900;
}

.timeline h3 {
  margin-top: 0;
  color: var(--white);
}

.timeline p {
  color: rgba(255, 255, 255, 0.7);
}

.qualification {
  background:
    linear-gradient(180deg, rgba(14, 131, 124, 0.08), rgba(14, 131, 124, 0)),
    var(--paper);
}

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

.proof-item {
  min-height: 205px;
  border-top: 4px solid var(--teal);
}

.applications {
  padding-top: 24px;
  background: var(--white);
}

.application-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.application-list span {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 14px;
  color: var(--charcoal);
  background: var(--paper);
  font-weight: 700;
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(0, 1.18fr);
  gap: 44px;
  align-items: start;
}

address {
  display: grid;
  gap: 10px;
  margin-top: 32px;
  font-style: normal;
}

address strong {
  color: var(--white);
  font-size: 20px;
}

.quote-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
}

.quote-form label {
  display: grid;
  gap: 8px;
  color: rgba(255, 255, 255, 0.84);
  font-weight: 700;
}

.inquiry-guide {
  margin-top: 28px;
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.inquiry-guide h3 {
  margin: 0 0 12px;
  color: var(--white);
  font-size: 20px;
}

.inquiry-guide ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
  color: rgba(255, 255, 255, 0.76);
}

.quote-form .wide {
  grid-column: 1 / -1;
}

.quote-form input,
.quote-form select,
.quote-form textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  padding: 12px 13px;
  color: var(--white);
  background: rgba(15, 22, 28, 0.78);
  outline: none;
}

.quote-form input:focus,
.quote-form select:focus,
.quote-form textarea:focus {
  border-color: var(--amber);
}

.quote-form textarea {
  resize: vertical;
}

.form-note {
  grid-column: 1 / -1;
  min-height: 24px;
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  white-space: pre-wrap;
}

.site-footer {
  background: #151b20;
  color: rgba(255, 255, 255, 0.72);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 0;
  font-size: 14px;
}

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

.footer-inner p {
  margin: 0;
}

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

.footer-inner .beian-link {
  color: rgba(255, 255, 255, 0.72);
}

.footer-inner .beian-link:hover {
  color: var(--white);
}

.footer-inner span {
  display: inline-flex;
  gap: 16px;
}

.contact-float {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 60;
}

.contact-toggle {
  display: grid;
  width: 62px;
  height: 62px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 50%;
  color: var(--white);
  background: var(--teal);
  box-shadow: 0 16px 40px rgba(8, 19, 26, 0.28);
  cursor: grab;
  touch-action: none;
}

.contact-toggle:active {
  cursor: grabbing;
}

.contact-toggle span {
  font-size: 28px;
  line-height: 1;
}

.contact-panel {
  position: absolute;
  right: 0;
  bottom: 76px;
  width: min(300px, calc(100vw - 32px));
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  color: var(--white);
  background: rgba(17, 24, 30, 0.96);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.contact-panel[hidden] {
  display: none;
}

.contact-panel strong {
  display: block;
  margin-bottom: 10px;
  color: var(--amber);
  font-size: 15px;
}

.contact-panel a {
  display: grid;
  grid-template-columns: minmax(72px, 0.8fr) minmax(0, 1.2fr);
  gap: 10px;
  align-items: center;
  min-height: 48px;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
}

.contact-panel a + a {
  margin-top: 8px;
}

.contact-panel span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.contact-panel b {
  font-size: 16px;
}

.contact-float[data-panel-side="below"] .contact-panel {
  top: 76px;
  bottom: auto;
}

@media (max-width: 1120px) {
  .hero h1 {
    font-size: 64px;
  }
}

@media (min-width: 1180px) {
  html[lang="zh-CN"] .hero h1 {
    white-space: nowrap;
  }
}

@media (max-width: 900px) {
  .site-header {
    min-height: 66px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% - 4px);
    right: 18px;
    left: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--ink);
    background: var(--white);
    box-shadow: var(--shadow);
  }

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

  .site-nav a {
    padding: 12px;
  }

  .hero {
    min-height: 86vh;
  }

  .hero-content {
    padding-top: 112px;
  }

  .hero h1 {
    font-size: 50px;
  }

  .hero-facts,
  .intro-grid,
  .process-layout,
  .proof-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .service-grid,
  .media-grid,
  .spec-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-header {
    gap: 10px;
    padding: 12px 14px;
  }

  .lang-switch a[aria-current="page"] {
    display: none;
  }

  .lang-switch a {
    min-width: 68px;
    padding: 6px 9px;
    font-size: 13px;
  }

  .brand {
    gap: 10px;
  }

  .brand-mark {
    width: 42px;
    height: 42px;
  }

  .brand strong {
    max-width: 160px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .hero {
    min-height: auto;
  }

  .hero-content {
    padding-bottom: 56px;
  }

  .hero h1 {
    font-size: 34px;
    line-height: 1.12;
  }

  html[lang="zh-CN"] .hero h1 {
    white-space: nowrap;
  }

  .hero-facts,
  .service-grid,
  .media-grid,
  .quote-form {
    grid-template-columns: 1fr;
  }

  .service-card,
  .spec-cards article,
  .proof-item,
  .quote-form {
    padding: 22px;
  }

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

  .timeline li {
    grid-template-columns: 1fr;
  }

  .quote-form .wide {
    grid-column: auto;
  }

  .contact-float {
    right: 16px;
    bottom: 18px;
  }

  .contact-toggle {
    width: 58px;
    height: 58px;
  }

  .contact-panel {
    bottom: 70px;
    width: min(292px, calc(100vw - 24px));
  }
}

@media (max-width: 360px) {
  .hero h1 {
    font-size: 28px;
  }
}