:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #5b6472;
  --line: #d8dee8;
  --panel: #ffffff;
  --soft: #f4f7fb;
  --brand: #0e7490;
  --accent: #ea580c;
  --green: #15803d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.75;
  background: #f8fafc;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

.wrap {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 800;
  font-size: 20px;
}

.brand img {
  width: 40px;
  height: 40px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 15px;
}

.hero {
  padding: 36px 0 28px;
  background: linear-gradient(180deg, #ffffff 0%, #eef6fb 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 32px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: var(--green);
  font-weight: 700;
  font-size: 14px;
}

h1,
h2,
h3 {
  line-height: 1.28;
  margin: 0 0 14px;
}

h1 {
  font-size: clamp(34px, 5vw, 56px);
  letter-spacing: 0;
}

h2 {
  font-size: clamp(24px, 3vw, 34px);
  padding-top: 10px;
}

h3 {
  font-size: 20px;
}

p {
  margin: 0 0 16px;
}

.lead {
  color: #374151;
  font-size: 18px;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  font-weight: 700;
}

.button.primary {
  color: #ffffff;
  background: var(--brand);
  border-color: var(--brand);
}

.banner {
  width: 100%;
  aspect-ratio: 1200 / 630;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--line);
  box-shadow: 0 18px 46px rgba(15, 23, 42, .14);
}

main {
  background: #ffffff;
}

.section {
  padding: 42px 0;
  border-top: 1px solid #eef2f7;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 34px;
  align-items: start;
}

.article {
  min-width: 0;
}

.toc,
.notice,
.link-card,
.info-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.toc {
  position: sticky;
  top: 92px;
  padding: 18px;
}

.toc strong {
  display: block;
  margin-bottom: 10px;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: #374151;
}

.notice {
  padding: 16px;
  background: #fff7ed;
  border-color: #fed7aa;
  color: #7c2d12;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.link-card {
  min-height: 144px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--ink);
}

.link-card img {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--line);
}

.link-card span {
  color: var(--muted);
  font-size: 14px;
}

.steps,
.plain-list {
  padding-left: 22px;
}

.steps li,
.plain-list li {
  margin: 8px 0;
}

.info-box {
  padding: 20px;
  background: var(--soft);
}

.qa details {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

.qa summary {
  cursor: pointer;
  font-weight: 700;
}

.page-title {
  padding: 44px 0 26px;
  background: #eef6fb;
}

.legal {
  max-width: 860px;
}

.site-footer {
  padding: 34px 0;
  color: #d1d5db;
  background: #111827;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links a {
  color: #f9fafb;
}

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

@media (max-width: 860px) {
  .nav,
  .footer-grid {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .toc {
    position: static;
  }

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

@media (max-width: 520px) {
  .nav-links {
    flex-wrap: wrap;
  }

  .link-grid {
    grid-template-columns: 1fr;
  }
}