:root {
  --ink: #121820;
  --graphite: #171f27;
  --graphite-2: #222b34;
  --muted: #5f6f7c;
  --paper: #ffffff;
  --wash: #f3f6f8;
  --wash-2: #e8eef2;
  --line: #d7e0e6;
  --blue: #126fa9;
  --blue-dark: #0b4f7c;
  --blue-soft: #e7f3fa;
  --steel: #8798a6;
  --steel-dark: #455764;
  --copper: #a8753b;
  --copper-soft: #ead6bd;
  --shadow-soft: 0 18px 48px rgba(17, 31, 43, 0.11);
  --shadow-strong: 0 34px 90px rgba(12, 22, 31, 0.24);
  color-scheme: light;
  font-family:
    "PingFang SC",
    "HarmonyOS Sans SC",
    "MiSans",
    "Alibaba PuHuiTi 3.0",
    "Source Han Sans CN",
    "Microsoft YaHei",
    Arial,
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.68;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(90deg, rgba(18, 24, 32, 0.025) 1px, transparent 1px),
    linear-gradient(180deg, rgba(18, 24, 32, 0.022) 1px, transparent 1px);
  background-size: 72px 72px;
}

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

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

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

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

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

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 34px;
  min-height: 76px;
  padding: 0 5vw;
  border-bottom: 1px solid rgba(215, 224, 230, 0.9);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: var(--blue-dark);
  white-space: nowrap;
}

.brand img {
  width: 44px;
  height: auto;
}

.brand span {
  display: grid;
  gap: 1px;
  line-height: 1.05;
}

.brand strong {
  font-size: 17px;
  font-weight: 900;
}

.brand em {
  color: var(--steel-dark);
  font-size: 11px;
  font-style: normal;
  font-weight: 800;
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: 34px;
  color: #354654;
  font-size: 14px;
  font-weight: 720;
}

.nav-links a {
  position: relative;
  padding: 27px 0;
}

.nav-links a::after {
  position: absolute;
  right: 0;
  bottom: 20px;
  left: 0;
  height: 2px;
  transform: scaleX(0);
  transform-origin: center;
  background: var(--copper);
  content: "";
  transition: transform 0.18s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--blue-dark);
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  transform: scaleX(1);
}

.nav-cta,
.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border-radius: 6px;
  font-weight: 820;
}

.nav-cta,
.primary-action {
  border: 0;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  box-shadow: 0 12px 26px rgba(18, 111, 169, 0.22);
  cursor: pointer;
}

.nav-cta {
  padding: 0 20px;
  font-size: 14px;
}

.primary-action {
  padding: 0 25px;
}

.primary-action:hover,
.primary-action:focus-visible,
.nav-cta:hover,
.nav-cta:focus-visible {
  background: linear-gradient(135deg, #0f6095, #083f64);
}

.secondary-action {
  padding: 0 23px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  color: #eef8ff;
  background: rgba(255, 255, 255, 0.08);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(440px, 0.92fr) minmax(500px, 1.08fr);
  gap: 64px;
  align-items: center;
  min-height: calc(100vh - 76px);
  overflow: hidden;
  padding: 84px 5vw 78px;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(18, 24, 32, 0.99), rgba(28, 40, 50, 0.98)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.08) 0 1px, transparent 1px 92px);
}

.hero::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 96px 96px;
  content: "";
  mask-image: linear-gradient(90deg, #000 0%, #000 100%);
}

.hero-copy,
.hero-visual {
  position: relative;
  z-index: 1;
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow,
.structure-section .eyebrow {
  color: var(--copper-soft);
}

.hero h1 {
  max-width: 760px;
  color: #fff;
  font-size: 78px;
  line-height: 1.02;
  font-weight: 920;
}

.hero-title-line {
  display: inline;
  white-space: nowrap;
}

.brand-line {
  margin: 26px 0 0;
  color: #d7e8f3;
  font-size: 34px;
  line-height: 1.2;
  font-weight: 850;
}

.hero-intro {
  max-width: 670px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.74);
  font-size: 20px;
}

.hero-status {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.12);
}

.hero-status span {
  min-height: 54px;
  padding: 14px 16px;
  color: rgba(255, 255, 255, 0.82);
  background: rgba(255, 255, 255, 0.055);
  font-size: 14px;
  font-weight: 760;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.hero-metrics div {
  min-height: 116px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-top: 3px solid var(--copper);
  border-radius: 6px;
  padding: 19px 18px;
  background: rgba(255, 255, 255, 0.075);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.16);
}

.hero-metrics strong {
  display: block;
  color: #fff;
  font-size: 38px;
  line-height: 1.1;
}

.hero-metrics span {
  display: block;
  margin-top: 9px;
  color: rgba(255, 255, 255, 0.68);
  font-weight: 720;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-visual {
  margin: 0;
}

.hero-mobile-visual {
  display: none;
}

.hero-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(18, 24, 32, 0.08);
  border-radius: 8px;
  background: #eef3f6;
  box-shadow: var(--shadow-strong);
}

.hero-frame::before {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.36), transparent 36%),
    repeating-linear-gradient(90deg, rgba(18, 24, 32, 0.045) 0 1px, transparent 1px 54px);
  content: "";
  mix-blend-mode: multiply;
}

.hero-frame img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.hero-visual figcaption {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 18px;
  border: 1px solid rgba(18, 24, 32, 0.1);
  background: rgba(18, 24, 32, 0.16);
}

.hero-visual span {
  padding: 13px 14px;
  color: var(--graphite);
  background: rgba(255, 255, 255, 0.92);
  font-size: 14px;
  font-weight: 820;
  text-align: center;
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: #2e3a43;
}

.proof-strip div {
  min-height: 170px;
  padding: 34px 5vw;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.045), transparent),
    var(--graphite);
}

.proof-strip small {
  display: block;
  margin-bottom: 16px;
  color: var(--copper-soft);
  font-size: 13px;
  font-weight: 900;
}

.proof-strip strong {
  display: block;
  color: #fff;
  font-size: 24px;
  line-height: 1.18;
}

.proof-strip span {
  display: block;
  max-width: 420px;
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.68);
}

.section-shell,
.product-band,
.split-section,
.ground-round-section,
.structure-section,
.service-section,
.contact-section {
  padding: 104px 5vw;
}

.section-shell,
.split-section,
.contact-section {
  background: rgba(255, 255, 255, 0.86);
}

.section-heading {
  max-width: 960px;
}

.section-heading h2,
.product-copy h2,
.structure-copy h2,
.service-copy h2,
.contact-copy h2 {
  max-width: 980px;
  color: var(--ink);
  font-size: 52px;
  line-height: 1.14;
  font-weight: 900;
}

.section-heading p:not(.eyebrow),
.product-copy p,
.structure-copy p,
.service-copy p,
.contact-copy p {
  max-width: 840px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 44px;
}

.advantage-card,
.choice-card,
.process-grid article,
.material-list article,
.contact-form {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.advantage-card {
  position: relative;
  min-height: 316px;
  overflow: hidden;
  padding: 28px;
  box-shadow: var(--shadow-soft);
}

.advantage-card::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--copper), var(--blue));
  content: "";
}

.advantage-card.is-blue,
.choice-card.is-blue {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.055), transparent),
    var(--graphite);
}

.advantage-card.is-blue::before {
  background: var(--copper);
}

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

.advantage-card.is-blue .card-index {
  color: var(--copper-soft);
}

.advantage-card h3,
.choice-card h3,
.process-grid h3,
.material-list h3 {
  margin-top: 22px;
  font-size: 24px;
  line-height: 1.22;
}

.advantage-card p,
.choice-card p,
.process-grid p,
.material-list p {
  margin: 14px 0 0;
  color: var(--muted);
}

.advantage-card.is-blue p,
.choice-card.is-blue p,
.choice-card.is-blue span {
  color: rgba(255, 255, 255, 0.76);
}

.param-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.param-tags span {
  padding: 8px 10px;
  border: 1px solid rgba(18, 111, 169, 0.12);
  border-radius: 6px;
  color: var(--blue-dark);
  background: var(--blue-soft);
  font-size: 13px;
  font-weight: 850;
  white-space: nowrap;
}

.is-blue .param-tags span {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.1);
}

.product-band {
  display: grid;
  grid-template-columns: minmax(380px, 0.78fr) minmax(420px, 1.22fr);
  gap: 52px;
  align-items: center;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.035), transparent 42%),
    linear-gradient(90deg, var(--graphite) 0%, #24313b 100%);
}

.product-band .eyebrow {
  color: var(--copper-soft);
}

.product-copy h2 {
  color: #fff;
}

.product-copy p {
  color: rgba(255, 255, 255, 0.7);
}

.product-visual {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 8px;
  background: #111820;
  box-shadow: var(--shadow-strong);
}

.product-visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.product-visual picture,
.hero-frame picture,
.hero-mobile-visual picture {
  display: block;
}

.material-list {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.material-list article {
  min-height: 176px;
  padding: 24px;
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
}

.material-list h3 {
  margin-top: 0;
  color: #fff;
}

.material-list p {
  color: rgba(255, 255, 255, 0.68);
}

.ground-round-section {
  background:
    linear-gradient(180deg, rgba(18, 111, 169, 0.055), transparent 44%),
    var(--wash);
}

.ground-round-layout {
  display: grid;
  grid-template-columns: minmax(340px, 0.82fr) minmax(560px, 1.18fr);
  gap: 48px;
  align-items: start;
}

.ground-round-copy h2 {
  max-width: 820px;
  color: var(--ink);
  font-size: 48px;
  line-height: 1.14;
  font-weight: 900;
}

.ground-round-copy p {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.ground-round-brief {
  display: grid;
  gap: 8px;
  margin-top: 28px;
  border-left: 4px solid var(--copper);
  padding: 20px 22px;
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.ground-round-brief strong {
  color: var(--ink);
  font-size: 18px;
}

.ground-round-brief span {
  color: var(--muted);
}

.ground-round-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.ground-round-grid article {
  min-height: 210px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.ground-round-grid h3 {
  font-size: 23px;
  line-height: 1.22;
}

.ground-round-grid p {
  margin: 14px 0 0;
  color: var(--muted);
}

.ground-round-inquiry {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.1);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.06), transparent),
    var(--graphite) !important;
}

.ground-round-inquiry h3 {
  color: #fff;
}

.ground-round-inquiry p {
  color: rgba(255, 255, 255, 0.74);
}

.split-section {
  display: grid;
  grid-template-columns: minmax(320px, 0.7fr) minmax(560px, 1.3fr);
  gap: 48px;
  align-items: start;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.choice-card {
  min-height: 292px;
  padding: 30px;
  box-shadow: var(--shadow-soft);
}

.choice-card span {
  display: block;
  margin-top: 26px;
  border-top: 1px solid rgba(95, 111, 124, 0.18);
  padding-top: 18px;
  color: var(--blue-dark);
  font-weight: 820;
}

.choice-card.is-blue span {
  border-color: rgba(255, 255, 255, 0.16);
}

.structure-section {
  display: grid;
  grid-template-columns: minmax(340px, 0.82fr) minmax(500px, 1.18fr);
  gap: 58px;
  align-items: center;
  color: #fff;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.045) 0 1px, transparent 1px 88px),
    linear-gradient(135deg, #111820, #26323c);
}

.structure-copy h2,
.service-section .service-copy h2 {
  color: #fff;
}

.structure-copy p,
.service-section .service-copy p {
  color: rgba(255, 255, 255, 0.72);
}

.structure-diagram {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  padding: 36px;
  background: rgba(255, 255, 255, 0.07);
  box-shadow: var(--shadow-strong);
}

.shaft-core {
  position: relative;
  aspect-ratio: 1;
  width: min(440px, 100%);
  margin: 0 auto;
  border: 18px solid #f8fbfd;
  border-radius: 50%;
  background:
    radial-gradient(circle, #f8fbfd 0 42%, #b8cbd8 43% 56%, #3f83ad 57% 70%, #f8fbfd 71% 73%, #7e9faf 74% 100%);
  box-shadow: inset 0 0 50px rgba(12, 46, 70, 0.24), 0 30px 70px rgba(0, 0, 0, 0.26);
}

.shaft-core span {
  position: absolute;
  max-width: 220px;
  border-radius: 6px;
  padding: 10px 12px;
  color: var(--ink);
  background: #fff;
  font-size: 14px;
  font-weight: 850;
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.18);
}

.core-label {
  left: 50%;
  top: 48%;
  transform: translate(-50%, -50%);
}

.case-label {
  right: -24px;
  top: 18%;
}

.chrome-label {
  right: -28px;
  bottom: 18%;
}

.structure-diagram p {
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.72);
  text-align: center;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 42px;
}

.process-grid article {
  min-height: 226px;
  padding: 26px;
  box-shadow: var(--shadow-soft);
}

.application-section {
  padding: 104px 5vw;
  background: #fff;
}

.application-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 42px;
}

.application-grid article {
  min-height: 230px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 26px;
  background:
    linear-gradient(180deg, rgba(18, 111, 169, 0.05), transparent 46%),
    #fff;
  box-shadow: var(--shadow-soft);
}

.application-grid h3 {
  font-size: 22px;
  line-height: 1.22;
}

.application-grid p {
  margin: 14px 0 0;
  color: var(--muted);
}

.service-section {
  display: grid;
  grid-template-columns: minmax(340px, 0.92fr) minmax(440px, 1.08fr);
  gap: 46px;
  align-items: center;
  background:
    linear-gradient(135deg, rgba(18, 111, 169, 0.78), rgba(18, 24, 32, 0.94)),
    url("assets/optimized/yixin-rods-stock-1200.webp") center / cover;
  background-blend-mode: multiply;
}

.service-section .eyebrow {
  color: var(--copper-soft);
}

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

.service-tags div {
  min-height: 152px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
}

.service-tags strong {
  display: block;
  color: #fff;
  font-size: 21px;
}

.service-tags span {
  display: block;
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.72);
}

.faq-section {
  background: #fff;
}

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 980px;
  margin-top: 38px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(17, 31, 43, 0.07);
}

.faq-list summary {
  cursor: pointer;
  padding: 20px 22px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 850;
}

.faq-list p {
  margin: 0;
  border-top: 1px solid var(--line);
  padding: 0 22px 20px;
  color: var(--muted);
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(340px, 0.82fr) minmax(560px, 1.18fr);
  gap: 56px;
  background: var(--wash);
}

.quote-template {
  display: grid;
  gap: 9px;
  margin-top: 24px;
  border-left: 4px solid var(--copper);
  padding: 20px 22px;
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.quote-template span {
  color: var(--muted);
}

.contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 190px;
  gap: 18px;
  margin-top: 32px;
}

.company-card,
.wechat-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.company-card {
  padding: 24px;
}

.company-label {
  color: var(--copper);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.company-card h3 {
  margin-top: 10px;
  font-size: 24px;
  line-height: 1.25;
  overflow-wrap: normal;
}

.company-card dl {
  display: grid;
  gap: 16px;
  margin: 22px 0 0;
}

.company-card dl div {
  display: grid;
  gap: 5px;
}

.company-card dt {
  color: var(--muted);
  font-size: 13px;
  font-weight: 850;
}

.company-card dd {
  margin: 0;
  color: var(--ink);
  font-size: 17px;
  font-weight: 760;
}

.company-card dd a {
  color: var(--blue-dark);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.call-action,
.copy-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 6px;
  padding: 0 16px;
  font-weight: 820;
}

.call-action {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
}

.copy-action {
  border: 1px solid rgba(18, 111, 169, 0.2);
  color: var(--blue-dark);
  background: var(--blue-soft);
  cursor: pointer;
}

.wechat-card {
  align-self: start;
  overflow: hidden;
  padding: 12px;
  text-align: center;
}

.qr-frame {
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 6px;
  background: #fff;
}

.qr-frame img {
  width: 100%;
  max-width: none;
}

.wechat-card figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 820;
}

.contact-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 30px;
  box-shadow: var(--shadow-soft);
}

.contact-form label {
  display: grid;
  gap: 8px;
}

.contact-form label span {
  color: #2f3e4b;
  font-size: 13px;
  font-weight: 900;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 13px 14px;
  color: var(--ink);
  background: #fff;
}

.contact-form textarea {
  resize: vertical;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--blue);
  outline: 3px solid rgba(18, 111, 169, 0.16);
}

.full-row {
  grid-column: 1 / -1;
}

.form-output {
  display: none;
  scroll-margin-top: 96px;
  border: 1px solid rgba(18, 111, 169, 0.18);
  border-radius: 8px;
  padding: 16px;
  color: var(--ink);
  background: var(--blue-soft);
  white-space: pre-wrap;
}

.form-output.is-visible {
  display: grid;
  gap: 14px;
}

.form-output.is-success {
  border-color: rgba(35, 132, 82, 0.42);
  background: #eaf7ef;
  box-shadow:
    inset 4px 0 0 #238452,
    0 16px 36px rgba(35, 132, 82, 0.16);
}

.form-output.is-pending {
  border-color: rgba(168, 117, 59, 0.36);
  background: #fff7e8;
  box-shadow:
    inset 4px 0 0 var(--copper),
    0 16px 36px rgba(168, 117, 59, 0.14);
}

.form-output.is-error {
  border-color: rgba(180, 35, 24, 0.34);
  background: #fff0ef;
  box-shadow:
    inset 4px 0 0 #b42318,
    0 16px 36px rgba(180, 35, 24, 0.12);
}

.form-output.is-duplicate {
  border-color: rgba(168, 117, 59, 0.42);
  background: #fff8e5;
  box-shadow:
    inset 4px 0 0 var(--copper),
    0 16px 36px rgba(168, 117, 59, 0.14);
}

.form-output h3 {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 18px;
}

.form-output h3::before {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  color: #fff;
  background: #238452;
  font-size: 15px;
  line-height: 1;
  content: "✓";
}

.form-output.is-pending h3::before,
.form-output.is-duplicate h3::before {
  background: var(--copper);
  content: "!";
}

.form-output.is-error h3::before {
  background: #b42318;
  content: "!";
}

.form-output p {
  margin: 0;
  color: var(--muted);
}

.lead-status {
  border-radius: 6px;
  padding: 10px 12px;
  font-weight: 820;
}

.lead-status[data-status="pending"] {
  color: #7a5a14;
  background: #fff4d8;
}

.lead-status[data-status="success"] {
  color: #16633b;
  background: #dff4e8;
}

.lead-status[data-status="error"] {
  color: #8b1f1f;
  background: #fde7e7;
}

.form-output pre {
  overflow-x: auto;
  margin: 0;
  border: 1px solid rgba(18, 111, 169, 0.14);
  border-radius: 6px;
  padding: 14px;
  color: var(--ink);
  background: #fff;
  font: inherit;
  white-space: pre-wrap;
}

.output-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.copy-inquiry,
.output-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  border-radius: 6px;
  padding: 0 14px;
  font-weight: 820;
}

.copy-inquiry {
  border: 0;
  color: #fff;
  background: var(--blue);
  cursor: pointer;
}

.output-actions a {
  border: 1px solid rgba(18, 111, 169, 0.2);
  color: var(--blue-dark);
  background: #fff;
}

.form-helper {
  margin: -2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.form-helper a {
  color: var(--blue-dark);
  font-weight: 850;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  padding: 38px 5vw;
  color: rgba(255, 255, 255, 0.72);
  background: #0f151b;
}

.site-footer img {
  width: 48px;
  margin-bottom: 10px;
}

.site-footer p,
.site-footer span {
  margin: 0;
}

.site-footer p {
  color: #fff;
  font-weight: 850;
}

.footer-note {
  display: grid;
  gap: 6px;
  align-self: end;
  max-width: 620px;
  text-align: right;
}

.footer-note a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.legal-main {
  background: var(--wash);
}

.legal-hero {
  padding: 86px 5vw 54px;
  color: #fff;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.045) 0 1px, transparent 1px 88px),
    linear-gradient(135deg, #111820, #26323c);
}

.legal-hero h1 {
  max-width: 900px;
  font-size: 54px;
  line-height: 1.12;
}

.legal-hero p {
  max-width: 760px;
  margin: 20px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 18px;
}

.legal-content {
  display: grid;
  gap: 18px;
  max-width: 980px;
  padding: 54px 5vw 92px;
}

.legal-section {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 26px;
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.legal-section h2 {
  font-size: 26px;
  line-height: 1.24;
}

.legal-section p,
.legal-section li {
  color: var(--muted);
}

.legal-section p {
  margin: 14px 0 0;
}

.legal-section ul {
  margin: 14px 0 0;
  padding-left: 1.2em;
}

.legal-section a {
  color: var(--blue-dark);
  font-weight: 850;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.error-page {
  min-height: 100vh;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(18, 24, 32, 0.98), rgba(25, 38, 48, 0.96)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.06) 0 1px, transparent 1px 88px);
}

.error-shell {
  display: grid;
  align-content: center;
  min-height: 100vh;
  max-width: 760px;
  padding: 72px 5vw;
}

.error-shell .brand {
  margin-bottom: 54px;
  color: #fff;
}

.error-shell .brand em {
  color: rgba(255, 255, 255, 0.66);
}

.error-shell h1 {
  font-size: clamp(48px, 8vw, 88px);
  line-height: 1.05;
}

.error-shell p:not(.eyebrow) {
  max-width: 620px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.74);
  font-size: 18px;
}

@media (max-width: 1180px) {
  .site-header {
    grid-template-columns: auto 1fr;
  }

  .nav-links {
    display: none;
  }

  .nav-cta {
    justify-self: end;
  }

  .hero,
  .product-band,
  .split-section,
  .ground-round-layout,
  .structure-section,
  .service-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 860px;
  }

  .hero-visual {
    max-width: 760px;
  }

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

@media (max-width: 760px) {
  body {
    font-size: 15px;
  }

  body::before {
    background-size: 44px 44px;
  }

  .site-header {
    min-height: auto;
    padding: 14px 18px;
  }

  .brand em {
    display: none;
  }

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

  .nav-cta {
    min-height: 44px;
    padding: 0 16px;
  }

  .hero,
  .section-shell,
  .application-section,
  .product-band,
  .split-section,
  .ground-round-section,
  .structure-section,
  .service-section,
  .contact-section {
    padding: 64px 18px;
  }

  .hero {
    min-height: auto;
    gap: 36px;
    padding-top: 40px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero-title-line {
    display: block;
  }

  .brand-line {
    margin-top: 18px;
    font-size: 25px;
  }

  .hero-intro {
    margin-top: 18px;
    font-size: 17px;
  }

  .hero-mobile-visual {
    display: block;
    overflow: hidden;
    margin: 24px 0 0;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 8px;
    background: #eef3f6;
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.22);
  }

  .hero-mobile-visual img {
    width: 100%;
    height: auto;
    object-fit: contain;
  }

  .hero > .hero-visual {
    display: none;
  }

  .hero-status,
  .hero-metrics,
  .proof-strip,
  .advantage-grid,
  .material-list,
  .ground-round-grid,
  .choice-grid,
  .process-grid,
  .application-grid,
  .service-tags,
  .contact-panel,
  .contact-form {
    grid-template-columns: 1fr;
  }

  .wechat-card {
    max-width: 260px;
  }

  .hero-status {
    margin-top: 18px;
  }

  .hero-status span {
    min-height: auto;
    padding: 10px 12px;
  }

  .hero-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .hero-metrics div {
    min-height: 82px;
    padding: 12px 9px;
  }

  .hero-metrics strong {
    font-size: 25px;
  }

  .hero-metrics span {
    margin-top: 5px;
    font-size: 12px;
    line-height: 1.3;
  }

  .hero-actions {
    gap: 12px;
    margin-top: 26px;
  }

  .primary-action,
  .secondary-action {
    min-height: 46px;
    padding: 0 18px;
  }

  .hero-frame img {
    min-height: 0;
  }

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

  .proof-strip div {
    min-height: auto;
    padding: 26px 18px;
  }

  .section-heading h2,
  .product-copy h2,
  .ground-round-copy h2,
  .structure-copy h2,
  .service-copy h2,
  .contact-copy h2 {
    font-size: 36px;
  }

  .section-heading p:not(.eyebrow),
  .product-copy p,
  .ground-round-copy p,
  .structure-copy p,
  .service-copy p,
  .contact-copy p {
    font-size: 16px;
  }

  .advantage-card,
  .choice-card,
  .process-grid article,
  .material-list article,
  .ground-round-grid article,
  .contact-form,
  .structure-diagram {
    padding: 22px;
  }

  .shaft-core span {
    position: static;
    display: block;
    max-width: none;
    margin: 8px;
    transform: none;
  }

  .site-footer {
    flex-direction: column;
    padding: 32px 18px;
  }

  .footer-note {
    align-self: start;
    text-align: left;
  }

  .legal-hero {
    padding: 60px 18px 42px;
  }

  .legal-hero h1 {
    font-size: 38px;
  }

  .legal-content {
    padding: 34px 18px 68px;
  }
}

@media (max-width: 420px) {
  .hero h1 {
    font-size: 40px;
  }

  .brand-line {
    font-size: 26px;
  }

  .hero-metrics strong {
    font-size: 23px;
  }

  .section-heading h2,
  .product-copy h2,
  .ground-round-copy h2,
  .structure-copy h2,
  .service-copy h2,
  .contact-copy h2 {
    font-size: 32px;
  }

  .company-card h3 {
    font-size: 21px;
    line-height: 1.35;
    word-break: keep-all;
  }
}