:root {
  --ink: #17201d;
  --muted: #5d6963;
  --line: #dfe7e2;
  --paper: #fbfcfa;
  --soft: #eef5f1;
  --accent: #0f766e;
  --accent-2: #b45309;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px max(24px, calc((100vw - 1120px) / 2));
  border-bottom: 1px solid var(--line);
  background: #ffffff;
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand {
  color: var(--ink);
  font-size: 22px;
  font-weight: 800;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 14px;
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px 56px;
}

.hero,
.page-head {
  padding: 56px 0 34px;
  border-bottom: 1px solid var(--line);
}

.hero h1,
.page-head h1,
.article h1 {
  max-width: 860px;
  margin: 8px 0 14px;
  font-size: 42px;
  line-height: 1.18;
  letter-spacing: 0;
}

.hero p,
.page-head p,
.lead {
  max-width: 860px;
  color: var(--muted);
  font-size: 18px;
}

.eyebrow {
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 700;
}

.category-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.category-strip a {
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
}

.band,
.grid-two,
.article {
  padding-top: 34px;
}

.grid-two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

h2 {
  margin: 0 0 14px;
  font-size: 24px;
  line-height: 1.28;
  letter-spacing: 0;
}

.entry-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

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

.entry-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.entry-list a {
  display: block;
  color: var(--ink);
  font-weight: 700;
}

.entry-list span {
  display: block;
  color: var(--muted);
  font-size: 14px;
}

.cta-panel {
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--soft);
}

.article {
  max-width: 880px;
}

.content-section,
.faq,
.related,
.cta-panel {
  margin-top: 28px;
}

.article p {
  margin: 0 0 14px;
}

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

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

.related ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 22px;
  padding-left: 18px;
}

.site-footer {
  padding: 28px max(24px, calc((100vw - 1120px) / 2));
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: #ffffff;
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero h1,
  .page-head h1,
  .article h1 {
    font-size: 30px;
  }

  .grid-two,
  .entry-list.columns,
  .related ul {
    grid-template-columns: 1fr;
  }
}