:root {
  color-scheme: light;
  --ink: #162033;
  --muted: #667085;
  --line: #d9e2ef;
  --blue: #2366d1;
  --cyan: #17a7c8;
  --green: #4f9465;
  --paper: #f5f8fc;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  min-height: 72px;
  padding: 0 5vw;
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid rgba(217, 226, 239, .8);
  backdrop-filter: blur(12px);
}

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

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--blue);
  color: var(--white);
  font-size: 24px;
  font-weight: 800;
}

.brand strong {
  display: block;
  font-size: 20px;
}

.brand small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: #344054;
  font-size: 15px;
}

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

.nav-login,
.primary {
  background: var(--blue);
  color: var(--white);
  box-shadow: 0 10px 26px rgba(35, 102, 209, .24);
}

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

.small {
  min-height: 38px;
  font-size: 14px;
}

.hero {
  position: relative;
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(320px, 1.05fr) minmax(300px, .75fr);
  gap: 34px;
  align-items: center;
  padding: 68px 5vw 56px;
  overflow: hidden;
  background: #0b2440;
}

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

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .44;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(7, 22, 41, .86), rgba(7, 22, 41, .48) 55%, rgba(245, 248, 252, .18));
}

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

.eyebrow,
.section-title p {
  margin: 0 0 12px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.hero h1 {
  margin: 0;
  color: var(--white);
  font-size: 74px;
  line-height: 1;
}

.lead {
  max-width: 760px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, .86);
  font-size: 23px;
  line-height: 1.7;
}

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

.hero-panel {
  align-self: end;
  margin-bottom: 24px;
  padding: 28px;
  background: rgba(255, 255, 255, .92);
  border: 1px solid rgba(255, 255, 255, .55);
  border-radius: 8px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .24);
}

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

.hero-panel strong {
  display: block;
  margin-top: 8px;
  font-size: 24px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.metric-grid div {
  padding: 16px;
  border-radius: 6px;
  background: #eef5ff;
}

.metric-grid b,
.metric-grid em {
  display: block;
  font-style: normal;
}

.metric-grid em {
  margin-top: 4px;
  color: var(--green);
}

.band,
.workflow,
.docs {
  padding: 78px 5vw;
}

.band {
  background: var(--white);
}

.section-title {
  max-width: 860px;
  margin-bottom: 32px;
}

.section-title h2 {
  margin: 0;
  font-size: 36px;
  line-height: 1.25;
}

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

.cards article,
.doc-links a {
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.cards h3 {
  margin: 0 0 12px;
  font-size: 21px;
}

.cards p,
.channel-copy p,
.steps p,
.doc-links span {
  color: var(--muted);
  line-height: 1.8;
}

.workflow {
  background: #eef4fb;
}

.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  padding: 22px;
  min-height: 210px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.steps span {
  color: var(--blue);
  font-weight: 800;
}

.steps strong {
  display: block;
  margin-top: 16px;
  font-size: 20px;
}

.channel-layout {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 28px;
  align-items: center;
}

.channel-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.channel-list span {
  padding: 22px 16px;
  border-radius: 8px;
  background: #edf7f9;
  border: 1px solid #c8e9ef;
  color: #15566b;
  font-weight: 700;
  text-align: center;
}

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

.doc-links strong,
.doc-links span {
  display: block;
}

.doc-links strong {
  margin-bottom: 10px;
  font-size: 20px;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 5vw;
  color: #dce7f7;
  background: #0b2440;
}

footer a {
  color: var(--white);
  font-weight: 700;
}

@media (max-width: 980px) {
  .site-header,
  nav,
  .hero-actions,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    gap: 12px;
  }

  .hero,
  .channel-layout {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 52px;
  }

  .cards,
  .steps,
  .doc-links,
  .channel-list {
    grid-template-columns: 1fr;
  }
}