:root {
  color-scheme: light;
  --background: #fbfaf7;
  --surface: #ffffff;
  --ink: #16202a;
  --muted: #52606d;
  --line: #d8d5ce;
  --link: #005f8c;
  --link-hover: #003f5f;
  --accent-surface: #edf5f8;
  --focus: #c24a00;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
}

a {
  color: var(--link);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--link-hover);
}

a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 10;
  padding: 0.5rem 0.75rem;
  background: var(--ink);
  color: #fff;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(100% - 2.5rem, 760px);
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
}

.site-header .shell {
  display: flex;
  align-items: center;
  min-height: 4.5rem;
}

.brand {
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-decoration: none;
}

main {
  padding-block: 4.75rem 4rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
  letter-spacing: 0.08em;
}

h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.28;
}

h1 {
  max-width: 15ch;
  margin: 0;
  font-size: clamp(2rem, 7vw, 3.3rem);
  letter-spacing: -0.035em;
}

h2 {
  margin: 2.6rem 0 0.75rem;
  font-size: 1.2rem;
  letter-spacing: -0.015em;
}

h3 {
  margin: 1.4rem 0 0.35rem;
  font-size: 1.03rem;
}

p,
li {
  max-width: 68ch;
}

.lead {
  max-width: 54ch;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.meta {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 2.5rem;
}

.link-card {
  display: block;
  min-height: 100%;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
}

.link-card:hover {
  border-color: var(--link);
  color: var(--ink);
}

.link-card strong,
.link-card span {
  display: block;
}

.link-card strong {
  font-size: 1rem;
}

.link-card span {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.content {
  margin-top: 3.1rem;
}

.content > :first-child {
  margin-top: 0;
}

.content ul {
  padding-left: 1.35rem;
}

.content li + li {
  margin-top: 0.45rem;
}

.notice {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--link);
  border-radius: 0 0.45rem 0.45rem 0;
  background: var(--accent-surface);
}

.notice p {
  margin: 0;
}

.faq-item {
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
}

.faq-item h2 {
  margin: 0;
  font-size: 1.08rem;
}

.faq-item p {
  margin: 0.5rem 0 0;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.site-footer .shell {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.2rem;
  align-items: baseline;
  justify-content: space-between;
  padding-block: 1.5rem 1.75rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 640px) {
  main {
    padding-block: 3.5rem 3rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}