:root {
  --ink: #182338;
  --muted: #5f6d80;
  --soft: #f3f6fa;
  --line: #dce4ee;
  --line-strong: #cfdae7;
  --white: #ffffff;
  --blue: #315f95;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--white);
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}

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

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

.wrap,
.nav {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand img {
  width: 156px;
  height: auto;
}

.nav-links,
.footer-links,
.actions {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.nav-links {
  color: var(--muted);
  font-size: 14px;
}

.nav-links a {
  padding: 6px 0;
}

.nav-links a:hover,
.nav-links .active {
  color: var(--ink);
  font-weight: 700;
}

.hero,
.page-hero {
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.hero-simple {
  min-height: 430px;
  padding: 70px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 48px;
  align-items: center;
}

h1,
h2,
h3,
p,
dl,
ol {
  margin: 0;
}

h1 {
  font-size: clamp(38px, 6vw, 62px);
  line-height: 1.1;
  letter-spacing: 0;
}

h2 {
  font-size: 28px;
  line-height: 1.25;
}

h3 {
  font-size: 18px;
  line-height: 1.35;
}

.lead {
  max-width: 680px;
  margin-top: 20px;
  color: var(--muted);
  font-size: 18px;
}

.actions {
  margin-top: 30px;
}

.button,
.link-button,
.quick-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: 15px;
}

.button {
  padding: 0 22px;
  color: var(--white);
  background: var(--ink);
}

.link-button {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.summary-panel,
.info-panel,
.page-card,
.feature-list article,
.timeline article {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.summary-panel {
  padding: 24px;
}

.summary-panel div + div {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.summary-panel span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.summary-panel strong {
  display: block;
  margin-top: 5px;
  font-size: 17px;
  line-height: 1.45;
}

.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--line);
}

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

.section-text {
  max-width: 620px;
  margin-top: 14px;
  color: var(--muted);
}

.page-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.page-card {
  min-height: 158px;
  padding: 22px;
  transition: border-color .15s ease, transform .15s ease;
}

.page-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-card p,
.feature-list p,
.info-panel p,
.timeline p {
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 36px;
  align-items: center;
}

.quick-links {
  display: grid;
  gap: 12px;
}

.quick-links a {
  padding: 0 18px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
}

.page-hero .wrap {
  padding: 54px 0;
}

.page-hero h1 {
  font-size: clamp(34px, 5vw, 48px);
}

.content-stack {
  display: grid;
  gap: 16px;
}

.info-panel {
  padding: 26px;
}

.steps {
  margin-top: 14px;
  padding-left: 22px;
  color: var(--muted);
}

.steps li + li {
  margin-top: 8px;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.feature-list article {
  padding: 24px;
}

.timeline {
  display: grid;
  gap: 16px;
}

.timeline article {
  padding: 22px;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
}

.timeline span {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--ink);
  border-radius: 12px;
  font-weight: 700;
}

.info-list {
  border-top: 1px solid var(--line);
}

.info-list div {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.info-list dt {
  color: var(--ink);
  font-weight: 700;
}

.info-list dd {
  margin: 0;
  color: var(--muted);
}

.info-list a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

.doc-body {
  max-width: 860px;
  padding: 58px 0 76px;
}

.doc-body h1 {
  font-size: clamp(32px, 5vw, 46px);
}

.doc-date {
  margin-top: 10px;
  color: var(--muted);
}

.doc-body h2 {
  margin-top: 34px;
  font-size: 22px;
}

.doc-body p {
  margin-top: 14px;
  color: #3f4d61;
}

.footer {
  color: var(--white);
  background: var(--ink);
}

.footer-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-size: 14px;
}

.footer a {
  text-decoration: underline;
  text-underline-offset: 4px;
}

@media (max-width: 860px) {
  .wrap,
  .nav {
    width: min(100% - 28px, 1080px);
  }

  .nav {
    min-height: 64px;
    align-items: flex-start;
    padding: 14px 0;
    flex-direction: column;
  }

  .nav-links {
    gap: 14px;
  }

  .hero-simple,
  .split {
    min-height: auto;
    padding: 46px 0;
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .page-grid,
  .feature-list {
    grid-template-columns: 1fr;
  }

  .info-list div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-inner {
    padding: 18px 0;
    align-items: flex-start;
    flex-direction: column;
  }
}