:root {
  --ink: #122033;
  --muted: #5c6b7a;
  --line: #d9e2ea;
  --blue: #0a5a7a;
  --blue-2: #1f95d5;
  --gold: #f2a900;
  --paper: #f7f9fb;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  min-height: 72px;
  padding: 10px clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

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

.brand img {
  width: 58px;
  height: 40px;
  object-fit: contain;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.2;
}

.brand strong {
  font-size: 18px;
  letter-spacing: 0.08em;
}

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

.nav {
  display: flex;
  justify-content: center;
  gap: 28px;
  color: var(--muted);
  font-size: 14px;
}

.nav a:hover {
  color: var(--blue);
}

.nav-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 20px;
  border-radius: 6px;
  font-weight: 700;
}

.nav-cta,
.button.primary {
  color: var(--white);
  background: var(--blue);
}

.button.secondary {
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
}

.hero {
  position: relative;
  min-height: calc(100svh - 72px);
  display: grid;
  align-items: center;
  padding: 96px clamp(20px, 5vw, 72px) 132px;
  overflow: hidden;
  color: var(--white);
}

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

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

.hero-overlay {
  background: linear-gradient(90deg, rgba(5, 18, 31, 0.88), rgba(5, 18, 31, 0.62) 48%, rgba(5, 18, 31, 0.18));
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 760px;
  min-width: 0;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.08;
  overflow-wrap: anywhere;
}

h1 span {
  display: block;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.18;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.lead {
  max-width: 680px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 19px;
  overflow-wrap: anywhere;
}

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

.hero-strip {
  position: absolute;
  z-index: 2;
  left: clamp(20px, 5vw, 72px);
  right: clamp(20px, 5vw, 72px);
  bottom: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--white);
  color: var(--ink);
  border-radius: 8px 8px 0 0;
  overflow: hidden;
  box-shadow: 0 -18px 50px rgba(0, 0, 0, 0.18);
}

.hero-strip div {
  min-height: 100px;
  padding: 22px 24px;
  border-right: 1px solid var(--line);
}

.hero-strip div:last-child {
  border-right: 0;
}

.hero-strip strong,
.hero-strip span {
  display: block;
}

.hero-strip strong {
  color: var(--blue);
  font-size: 24px;
  line-height: 1.2;
}

.hero-strip span {
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 88px clamp(20px, 5vw, 72px);
}

.intro {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) 1fr;
  gap: clamp(28px, 6vw, 84px);
  border-bottom: 1px solid var(--line);
}

.intro > p,
.section-copy > p {
  color: var(--muted);
  font-size: 17px;
}

.service-grid,
.route-grid,
.solution-grid {
  display: grid;
  gap: 18px;
}

.service-grid {
  grid-template-columns: repeat(4, 1fr);
}

.service-grid article,
.route-grid article,
.solution-grid article,
.case-list article,
.contact-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.service-grid article {
  min-height: 260px;
  padding: 28px;
}

.service-grid span {
  color: var(--gold);
  font-weight: 800;
}

.service-grid p,
.route-grid p,
.solution-grid p,
.case-list p,
.contact-copy p {
  color: var(--muted);
}

.visual-band {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  min-height: 520px;
  background: var(--ink);
  color: var(--white);
}

.visual-band img {
  width: 100%;
  height: 100%;
  min-height: 520px;
  object-fit: cover;
}

.visual-band div {
  align-self: center;
  padding: clamp(36px, 6vw, 76px);
}

.visual-band p:not(.eyebrow) {
  color: rgba(255, 255, 255, 0.72);
}

.routes,
.credentials {
  background: var(--paper);
}

.route-grid {
  grid-template-columns: repeat(4, 1fr);
}

.route-grid article {
  padding: 26px;
  min-height: 210px;
}

.route-grid small {
  color: var(--blue);
  font-weight: 700;
}

.solution-grid {
  grid-template-columns: repeat(3, 1fr);
}

.solution-grid article {
  overflow: hidden;
}

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

.solution-grid h3,
.solution-grid p {
  padding-left: 24px;
  padding-right: 24px;
}

.solution-grid h3 {
  padding-top: 24px;
}

.solution-grid p {
  padding-bottom: 26px;
}

.cases {
  background: #ffffff;
}

.case-list {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.case-list article {
  display: grid;
  grid-template-columns: 86px 1fr;
  gap: 20px;
  padding: 26px;
}

.case-index {
  color: var(--blue);
  font-size: 32px;
  font-weight: 800;
}

.credential-panel {
  display: grid;
  grid-template-columns: 1fr minmax(280px, 420px);
  gap: 40px;
  align-items: center;
  padding: clamp(28px, 5vw, 56px);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.credential-panel img {
  width: 100%;
  border: 1px solid var(--line);
}

dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 30px 0 0;
}

dt {
  color: var(--muted);
  font-size: 13px;
}

dd {
  margin: 4px 0 0;
  font-weight: 800;
}

.contact {
  display: grid;
  grid-template-columns: 1fr minmax(320px, 440px);
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
  background: var(--blue);
  color: var(--white);
}

.contact-copy p {
  color: rgba(255, 255, 255, 0.78);
}

.contact-panel {
  display: grid;
  gap: 10px;
  padding: 30px;
  color: var(--ink);
}

.contact-panel a {
  color: var(--blue);
  font-size: 18px;
  font-weight: 800;
}

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

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 28px clamp(20px, 5vw, 72px);
  color: rgba(255, 255, 255, 0.72);
  background: #071523;
  font-size: 14px;
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer strong {
  color: var(--white);
  letter-spacing: 0.08em;
}

.footer-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav {
    display: none;
  }

  .hero-strip,
  .service-grid,
  .route-grid,
  .solution-grid,
  dl {
    grid-template-columns: repeat(2, 1fr);
  }

  .intro,
  .visual-band,
  .credential-panel,
  .contact {
    grid-template-columns: 1fr;
  }

  .visual-band img {
    min-height: 340px;
  }
}

@media (max-width: 640px) {
  .site-header {
    min-height: 66px;
    gap: 12px;
  }

  .brand img {
    width: 48px;
  }

  .nav-cta {
    display: none;
  }

  .hero {
    padding-top: 72px;
    padding-bottom: 0;
  }

  h1 {
    font-size: 32px;
    line-height: 1.16;
  }

  .lead {
    font-size: 17px;
    max-width: min(330px, calc(100vw - 64px));
    word-break: break-all;
  }

  .hero-strip {
    position: relative;
    left: auto;
    right: auto;
    margin-top: 54px;
    grid-template-columns: 1fr;
    border-radius: 8px 8px 0 0;
  }

  .hero-strip div {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .section {
    padding-top: 60px;
    padding-bottom: 60px;
  }

  .service-grid,
  .route-grid,
  .solution-grid,
  dl {
    grid-template-columns: 1fr;
  }

  .case-list article {
    grid-template-columns: 1fr;
  }

  .site-footer,
  .footer-links {
    display: grid;
  }
}