:root {
  --ink: #17202a;
  --muted: #66727f;
  --line: #e3e8ee;
  --paper: #ffffff;
  --soft: #f5f7f9;
  --steel: #2f475f;
  --accent: #c86a2a;
  --accent-dark: #9d4d19;
  --shadow: 0 18px 48px rgba(23, 32, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.65;
}

main {
  flex: 1 0 auto;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  min-height: 76px;
  padding: 0 6vw;
  border-bottom: 1px solid rgba(227, 232, 238, 0.88);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

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

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: #fff;
  background: var(--steel);
  font-weight: 800;
  letter-spacing: 0;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
  line-height: 1.15;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 10px 14px;
  color: #43505d;
  font-size: 15px;
  transition: color 0.2s ease, background 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--accent-dark);
  background: #fff1e8;
}

.site-nav a.nav-contact {
  margin-left: 6px;
  color: #fff;
  background: var(--steel);
}

.site-nav a.nav-contact:hover,
.site-nav a.nav-contact.active {
  color: #fff;
  background: var(--accent-dark);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: #fff;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  align-items: center;
  gap: 48px;
  min-height: calc(100vh - 76px);
  padding: 58px 6vw 70px;
  background: linear-gradient(120deg, #f8fafb 0%, #ffffff 54%, #eef3f6 100%);
}

.hero-copy {
  max-width: 610px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(48px, 7vw, 86px);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(28px, 3.8vw, 44px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 22px;
  line-height: 1.25;
  letter-spacing: 0;
}

.lead {
  max-width: 560px;
  color: #42505d;
  font-size: 21px;
}

.hero-actions,
.cta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid var(--steel);
  font-weight: 700;
  cursor: pointer;
}

.button.primary {
  color: #fff;
  background: var(--steel);
}

.button.primary:hover {
  background: #203448;
}

.button.ghost {
  color: var(--steel);
  background: transparent;
}

.button.ghost:hover {
  background: #edf2f5;
}

.hero-visual {
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #dfe6eb;
}

.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1735 / 906;
  object-fit: contain;
}

.section {
  padding: 76px 6vw;
}

.trust-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  padding-top: 34px;
  padding-bottom: 34px;
  background: var(--steel);
  color: #fff;
}

.trust-band div {
  padding: 0 28px;
  border-left: 1px solid rgba(255, 255, 255, 0.22);
}

.trust-band div:first-child {
  border-left: 0;
}

.trust-band strong,
.trust-band span {
  display: block;
}

.trust-band strong {
  margin-bottom: 4px;
  font-size: 20px;
}

.trust-band span {
  color: #d5dde4;
}

.split {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.15fr);
  gap: 48px;
  align-items: start;
}

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

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

.service-card,
.values div,
.timeline div,
.product-block,
.contact-panel,
.contact-form {
  border: 1px solid var(--line);
  background: #fff;
}

.service-card {
  min-height: 245px;
  padding: 26px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.service-card span,
.timeline span {
  display: block;
  margin-bottom: 26px;
  color: var(--accent-dark);
  font-weight: 800;
}

.service-card p {
  margin-bottom: 0;
}

.cta {
  justify-content: space-between;
  background: var(--soft);
}

.cta div {
  max-width: 780px;
}

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

.page-hero {
  padding: 80px 6vw 64px;
  background: linear-gradient(120deg, #f6f8fa 0%, #fff 65%, #f1f5f7 100%);
}

.page-hero h1 {
  font-size: clamp(42px, 6vw, 72px);
}

.page-hero p:last-child {
  max-width: 720px;
  color: var(--muted);
  font-size: 20px;
}

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

.values div {
  padding: 24px;
}

.values strong,
.values span {
  display: block;
}

.values strong {
  margin-bottom: 8px;
  color: var(--steel);
  font-size: 24px;
}

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

.timeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  background: var(--soft);
}

.timeline div {
  padding: 28px;
}

.timeline p,
.product-block p,
.contact-panel p {
  color: var(--muted);
}

.product-list {
  display: grid;
  gap: 22px;
}

.product-block {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  gap: 34px;
  padding: 34px;
  align-items: center;
}

.product-block ul {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.product-block li {
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  background: var(--soft);
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.85fr) minmax(320px, 1.15fr);
  gap: 24px;
  align-items: start;
  padding-bottom: 46px;
}

.contact-panel,
.contact-form,
.contact-card {
  padding: 32px;
}

dl {
  display: grid;
  gap: 18px;
  margin: 28px 0 0;
}

dt {
  color: var(--steel);
  font-weight: 800;
}

dd {
  margin: 4px 0 0;
  color: var(--muted);
}

.contact-form {
  display: grid;
  gap: 18px;
}

.contact-card {
  border: 1px solid var(--line);
  background: var(--soft);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

label {
  display: grid;
  gap: 8px;
  color: #3d4954;
  font-weight: 700;
}

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

textarea {
  resize: vertical;
}

.site-footer {
  color: #cbd4dc;
  background: #121a23;
}

.site-footer h3,
.site-footer p {
  margin: 0;
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 36px;
  padding: 46px 6vw;
}

.footer-main h3 {
  margin-bottom: 14px;
  color: #fff;
  font-size: 20px;
}

.footer-main ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-records {
  display: grid;
  gap: 8px;
  padding: 16px 6vw;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: 14px;
}

.footer-records a {
  display: inline-flex;
  align-items: center;
  min-height: 20px;
  gap: 6px;
  line-height: 20px;
}

.footer-records div:last-child {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-records img {
  display: block;
  width: 18px;
  height: 20px;
  object-fit: contain;
  flex: 0 0 auto;
}

.footer-records span {
  display: inline-flex;
  align-items: center;
  min-height: 20px;
  line-height: 20px;
  color: #6f7b86;
}

.mobile-action-space,
.mobile-action-bar {
  display: none;
}

.online-tools {
  position: fixed;
  right: 18px;
  bottom: 34px;
  z-index: 20;
  display: grid;
  gap: 10px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.online-tools.visible {
  pointer-events: auto;
  opacity: 1;
  transform: translateY(0);
}

.online-tools button {
  border: 0;
  padding: 12px 14px;
  color: #fff;
  background: var(--steel);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.wechat-panel {
  display: none;
  width: 210px;
  padding: 18px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
}

.wechat-panel.open {
  display: block;
}

.wechat-panel strong {
  display: block;
  margin-bottom: 12px;
  color: var(--ink);
}

.wechat-panel img {
  width: 100%;
  background: var(--soft);
}

.online-close {
  float: right;
  width: 28px;
  height: 28px;
  padding: 0 !important;
  box-shadow: none !important;
}

@media (max-width: 980px) {
  .hero,
  .split,
  .contact-layout,
  .product-block {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

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

@media (max-width: 760px) {
  .site-header {
    min-height: 68px;
    padding: 0 20px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 68px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 20px 20px;
    border-bottom: 1px solid var(--line);
    background: #fff;
  }

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

  .site-nav a {
    padding: 12px 0;
  }

  .site-nav a.nav-contact {
    margin-left: 0;
    padding: 12px 14px;
  }

  .hero,
  .section,
  .page-hero {
    padding-left: 20px;
    padding-right: 20px;
  }

  .hero {
    gap: 30px;
    padding-top: 44px;
  }

  h1 {
    font-size: 52px;
  }

  .lead,
  .page-hero p:last-child {
    font-size: 18px;
  }

  .trust-band {
    grid-template-columns: 1fr;
  }

  .trust-band div {
    padding: 18px 0;
    border-left: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.22);
  }

  .trust-band div:first-child {
    border-top: 0;
  }

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

  .product-block,
  .contact-panel,
  .contact-form,
  .contact-card {
    padding: 24px;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 36px 20px;
  }

  .online-tools {
    display: none;
  }

  .footer-records {
    padding: 16px 20px 18px;
    font-size: 13px;
    justify-items: center;
  }

  .footer-records div:last-child {
    display: grid;
    justify-items: center;
    gap: 6px;
  }

  .footer-records a {
    justify-content: center;
    text-align: center;
  }

  .footer-records span {
    display: none;
  }

  .mobile-action-space {
    display: block;
    height: 54px;
  }

  .mobile-action-bar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    background: var(--steel);
  }

  .mobile-action-bar a {
    display: grid;
    place-items: center;
    min-height: 54px;
    color: #fff;
    font-weight: 800;
  }

  .mobile-action-bar a + a {
    border-left: 1px solid rgba(255, 255, 255, 0.25);
  }
}