:root {
  color-scheme: light;
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-alt: #eef1f4;
  --text: #18212d;
  --muted: #566170;
  --line: #d7dde5;
  --accent: #2f5d62;
  --accent-strong: #1f4146;
  --gold: #a46d28;
  --shadow: 0 18px 38px rgba(24, 33, 45, 0.08);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.68;
}

.hero {
  background:
    linear-gradient(135deg, rgba(24, 33, 45, 0.94), rgba(47, 93, 98, 0.88)),
    radial-gradient(circle at 80% 20%, rgba(212, 175, 55, 0.28), transparent 34%);
  color: #ffffff;
  padding: 58px 20px 46px;
}

.hero__content,
main,
footer {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 10px;
  color: #d7c08d;
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

h1 {
  max-width: 820px;
  margin-bottom: 16px;
  font-size: clamp(2.1rem, 5.4vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  line-height: 1.2;
  letter-spacing: 0;
}

.hero__lede {
  max-width: 780px;
  margin-bottom: 0;
  color: #edf3f2;
  font-size: 1.12rem;
}

main {
  padding: 28px 0 48px;
}

.summary,
.content-grid article,
.timeline,
.faq,
.sources {
  margin-top: 24px;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 18px;
}

.section-heading p,
article p,
li,
details p,
footer p {
  color: var(--muted);
}

.summary-grid,
.content-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.summary-grid article {
  min-height: 180px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 20px;
}

.summary-grid strong {
  display: block;
  margin-bottom: 10px;
  color: var(--accent-strong);
  font-size: 1.18rem;
}

.content-grid article,
.timeline,
.faq,
.sources {
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.timeline {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-alt);
  padding: 22px 24px;
}

ol,
ul {
  margin: 0;
  padding-left: 1.25rem;
}

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

.faq {
  display: grid;
  gap: 10px;
}

details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 14px 16px;
}

summary {
  cursor: pointer;
  font-weight: 800;
}

summary:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(47, 93, 98, 0.24);
  outline-offset: 2px;
}

details p {
  margin: 10px 0 0;
}

a {
  color: var(--accent);
  font-weight: 700;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 36px;
}

footer p {
  margin-bottom: 0;
  font-size: 0.94rem;
}

@media (max-width: 760px) {
  .hero {
    padding: 42px 0 34px;
  }

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

  .summary-grid article {
    min-height: auto;
  }
}