:root {
  --ink: #17201d;
  --muted: #5d6865;
  --line: #dce5df;
  --paper: #f7f8f4;
  --white: #ffffff;
  --green: #0d5d4a;
  --green-2: #1c8a72;
  --blue: #2456a6;
  --coral: #d95f43;
  --amber: #dfb64f;
  --shadow: 0 22px 70px rgba(23, 32, 29, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 24px;
  padding: 18px clamp(18px, 5vw, 72px);
  border-bottom: 1px solid rgba(220, 229, 223, 0.8);
  background: rgba(247, 248, 244, 0.9);
  backdrop-filter: blur(16px);
}

.brand,
.nav,
.hero-actions,
.trust-strip,
.site-footer {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 760;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 8px;
  background: var(--ink);
  color: var(--white);
  font-weight: 800;
}

.nav {
  gap: 26px;
  color: var(--muted);
  font-size: 15px;
}

.nav a,
.header-action {
  transition:
    color 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

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

.header-controls {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 12px;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.lang-button {
  min-width: 54px;
  min-height: 36px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  transition:
    background 180ms ease,
    color 180ms ease;
}

.lang-button.is-active {
  background: var(--ink);
  color: var(--white);
}

.header-action {
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--green);
  font-weight: 700;
}

.header-action:hover {
  border-color: rgba(13, 93, 74, 0.35);
  background: rgba(13, 93, 74, 0.06);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(360px, 1.12fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: clamp(52px, 8vw, 92px) clamp(18px, 5vw, 72px) 42px;
}

.hero-copy {
  max-width: 720px;
}

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

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

h1 {
  margin: 0;
  font-size: clamp(54px, 8vw, 118px);
  line-height: 0.92;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 58px);
  line-height: 1.03;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.25;
}

.hero-lede {
  max-width: 670px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
}

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

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 12px 20px;
  font-weight: 780;
  transition:
    transform 180ms ease,
    background 180ms ease,
    border-color 180ms ease;
}

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

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

.button.primary:hover {
  background: #094b3c;
}

.button.secondary {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.62);
}

.button.secondary:hover {
  border-color: rgba(23, 32, 29, 0.25);
}

.trust-strip {
  flex-wrap: wrap;
  gap: 16px;
  margin: 40px 0 0;
}

.trust-strip div {
  min-width: 148px;
  padding: 14px 16px;
  border-left: 3px solid var(--green-2);
  background: rgba(255, 255, 255, 0.58);
}

.trust-strip dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
  text-transform: uppercase;
}

.trust-strip dd {
  margin: 3px 0 0;
  font-weight: 800;
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border: 1px solid rgba(23, 32, 29, 0.08);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.section {
  padding: clamp(68px, 9vw, 118px) clamp(18px, 5vw, 72px);
}

.intro {
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(280px, 1fr);
  gap: clamp(28px, 6vw, 86px);
  align-items: start;
  border-top: 1px solid var(--line);
}

.intro p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.service-card {
  min-height: 274px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.card-index {
  display: block;
  margin-bottom: 46px;
  color: var(--coral);
  font-weight: 850;
}

.service-card p,
.step p,
.global-copy p,
.contact-panel p {
  color: var(--muted);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.step {
  position: relative;
  min-height: 250px;
  padding: 28px 28px 0 0;
  border-right: 1px solid var(--line);
}

.step:last-child {
  border-right: 0;
}

.step::before {
  position: absolute;
  top: -7px;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--amber);
  content: "";
}

.step span {
  display: block;
  margin-bottom: 18px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

.global-band {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(280px, 0.75fr);
  gap: clamp(28px, 6vw, 78px);
  align-items: center;
  padding: clamp(68px, 9vw, 116px) clamp(18px, 5vw, 72px);
  background: #10231f;
  color: var(--white);
}

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

.global-copy .eyebrow {
  color: #86d2bc;
}

.global-copy p {
  max-width: 690px;
  font-size: clamp(18px, 2vw, 22px);
}

.global-list {
  display: grid;
  gap: 12px;
}

.global-list div {
  display: grid;
  gap: 5px;
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.global-list strong {
  font-size: 19px;
}

.global-list span {
  color: rgba(255, 255, 255, 0.72);
}

.contact {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(280px, 0.72fr);
  gap: clamp(28px, 6vw, 88px);
  align-items: start;
}

.contact-panel {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.contact-panel p {
  margin-top: 0;
  font-size: 18px;
}

.site-footer {
  justify-content: space-between;
  gap: 18px;
  padding: 30px clamp(18px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

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

  .nav {
    display: none;
  }

  .hero,
  .intro,
  .global-band,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

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

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

  .step:nth-child(2) {
    border-right: 0;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 14px 16px;
  }

  .header-controls {
    gap: 8px;
  }

  .brand span:last-child {
    max-width: 140px;
    white-space: normal;
    line-height: 1.1;
  }

  .lang-button {
    min-width: 46px;
  }

  .header-action {
    padding: 8px 11px;
    font-size: 14px;
  }

  .hero,
  .section,
  .global-band {
    padding-right: 16px;
    padding-left: 16px;
  }

  h1 {
    font-size: 58px;
  }

  .button {
    width: 100%;
  }

  .trust-strip,
  .section-heading,
  .site-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .trust-strip div {
    width: 100%;
  }

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

  .step,
  .step:nth-child(2) {
    min-height: auto;
    padding-bottom: 28px;
    border-right: 0;
  }
}