:root {
  --ink: #101317;
  --ink-2: #1d242b;
  --muted: #5e6874;
  --soft: #f6f7f5;
  --paper: #ffffff;
  --line: #dfe5e2;
  --teal: #0f766e;
  --cyan: #13a4b4;
  --coral: #d65b42;
  --sage: #5f7d57;
  --plum: #6048a8;
  --golden: #b9812f;
  --shadow: 0 22px 70px rgba(16, 19, 23, .12);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
  line-height: 1.58;
  text-rendering: optimizeLegibility;
}

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

button,
input,
textarea {
  font: inherit;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: 72px;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, .14);
  background: rgba(10, 14, 17, .58);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(var(--max), calc(100% - 40px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 840;
  white-space: nowrap;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--teal), var(--plum));
  box-shadow: 0 10px 24px rgba(15, 118, 110, .28);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14px;
  font-weight: 720;
  color: rgba(255, 255, 255, .82);
}

.nav-links a {
  padding: 24px 0;
}

.nav-links a[aria-current="page"] {
  color: #fff;
}

.nav-action {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  padding: 0 16px;
  border: 1px solid rgba(255, 255, 255, .22);
  background: rgba(255, 255, 255, .08);
  color: #fff;
  font-size: 14px;
  font-weight: 780;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, .24);
  border-radius: 8px;
  background: rgba(255, 255, 255, .08);
  color: inherit;
  place-items: center;
  cursor: pointer;
}

.page-hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(6, 10, 13, .94), rgba(6, 10, 13, .68) 52%, rgba(6, 10, 13, .28)),
    url("hero-crossborder-ai.png");
  background-size: cover;
  background-position: center;
}

.page-hero-inner {
  width: min(var(--max), calc(100% - 40px));
  min-height: 520px;
  margin: 0 auto;
  padding: 150px 0 84px;
  display: grid;
  align-content: end;
}

.page-hero h1 {
  max-width: 840px;
  margin: 0;
  font-size: 60px;
  line-height: 1.04;
  font-weight: 880;
}

.page-hero p {
  max-width: 720px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, .78);
  font-size: 19px;
  line-height: 1.78;
  font-weight: 560;
}

.wrap {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.section {
  padding: 86px 0;
}

.section.soft {
  background: var(--soft);
}

.section.dark {
  background: var(--ink);
  color: #fff;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(300px, .56fr);
  gap: 44px;
  align-items: end;
  margin-bottom: 34px;
}

h2 {
  margin: 0;
  font-size: 42px;
  line-height: 1.08;
  font-weight: 860;
}

.section-head p,
.lead {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.78;
}

.dark .section-head p,
.dark .lead {
  color: rgba(255, 255, 255, .68);
}

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

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 22px;
  min-height: 210px;
}

.dark .card {
  border-color: rgba(255, 255, 255, .12);
  background: rgba(255, 255, 255, .055);
}

.card h3 {
  margin: 0;
  font-size: 22px;
  line-height: 1.2;
  font-weight: 840;
}

.card p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.68;
}

.dark .card p {
  color: rgba(255, 255, 255, .66);
}

.icon-box {
  width: 46px;
  height: 46px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  color: #fff;
  background: var(--teal);
}

.card:nth-child(2) .icon-box { background: var(--coral); }
.card:nth-child(3) .icon-box { background: var(--plum); }
.card:nth-child(4) .icon-box { background: var(--sage); }
.card:nth-child(5) .icon-box { background: var(--cyan); }
.card:nth-child(6) .icon-box { background: var(--golden); }

.split-panel {
  border-radius: 8px;
  border: 1px solid var(--line);
  overflow: hidden;
  background: #fff;
  display: grid;
  grid-template-columns: minmax(0, .94fr) minmax(0, 1.06fr);
}

.split-copy {
  padding: 34px;
}

.split-copy h2 {
  font-size: 36px;
}

.split-copy p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
}

.split-visual {
  min-height: 360px;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, .16), rgba(96, 72, 168, .12)),
    url("hero-crossborder-ai.png");
  background-size: cover;
  background-position: center;
}

.check-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}

.check-list li {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.5;
}

.check-list i {
  color: var(--teal);
  margin-top: 2px;
}

.step-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.step {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 18px;
  min-height: 178px;
}

.step strong {
  display: block;
  color: var(--teal);
  font-size: 13px;
  margin-bottom: 14px;
}

.step h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.25;
}

.step p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  font-weight: 780;
}

.button.secondary {
  background: #fff;
  color: var(--ink);
  border-color: var(--line);
}

.contact-form {
  display: grid;
  gap: 12px;
}

.field {
  display: grid;
  gap: 7px;
}

.field label {
  color: var(--ink-2);
  font-size: 13px;
  font-weight: 760;
}

.field input,
.field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px 14px;
  color: var(--ink);
  background: #fff;
  outline: none;
}

.field textarea {
  min-height: 132px;
  resize: vertical;
}

.form-note {
  min-height: 44px;
  border-radius: 8px;
  padding: 12px 14px;
  background: #eef7f5;
  color: #0f4f49;
  font-size: 14px;
  display: none;
}

.form-note.is-visible {
  display: block;
}

.cta-band {
  padding: 74px 0;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(16, 19, 23, .96), rgba(16, 19, 23, .66)),
    url("hero-crossborder-ai.png");
  background-size: cover;
  background-position: center bottom;
}

.cta-band h2 {
  max-width: 760px;
}

.cta-band p {
  max-width: 620px;
  margin: 18px 0 0;
  color: rgba(255, 255, 255, .72);
  font-size: 16px;
  line-height: 1.74;
}

.footer {
  background: #090b0e;
  color: rgba(255, 255, 255, .72);
  padding: 36px 0;
}

.footer-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

@media (max-width: 980px) {
  .nav-links {
    gap: 16px;
  }

  .page-hero h1 {
    font-size: 48px;
  }

  .grid-4,
  .grid-3,
  .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split-panel,
  .section-head {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: 64px;
  }

  .nav {
    width: calc(100% - 28px);
  }

  .nav-links {
    position: absolute;
    top: 64px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 18px;
    border-radius: 8px;
    background: #f7f8f6;
    color: var(--ink);
    box-shadow: var(--shadow);
  }

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

  .nav-links a {
    padding: 12px 10px;
    color: var(--ink);
  }

  .nav-action {
    display: none;
  }

  .menu-toggle {
    display: grid;
  }

  .page-hero-inner,
  .wrap,
  .footer-inner {
    width: calc(100% - 28px);
  }

  .page-hero-inner {
    min-height: 500px;
    padding: 112px 0 62px;
  }

  .page-hero h1 {
    font-size: 39px;
  }

  .page-hero p {
    font-size: 16px;
  }

  .section {
    padding: 62px 0;
  }

  h2 {
    font-size: 32px;
  }

  .grid-4,
  .grid-3,
  .grid-2,
  .step-list {
    grid-template-columns: 1fr;
  }

  .split-copy {
    padding: 24px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .button-row {
    flex-direction: column;
  }
}