:root {
  color-scheme: light;
  --bg: #f6f4ee;
  --panel: #ffffff;
  --ink: #202426;
  --muted: #66706e;
  --line: #d9dfdc;
  --accent: #176b5b;
  --accent-soft: #e2eee9;
  --warm: #c47a42;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(226, 238, 233, 0.82), transparent 340px),
    var(--bg);
  color: var(--ink);
  font-family:
    ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

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

main {
  width: min(100% - 32px, 1080px);
  margin: 0 auto;
  padding: 34px 0 60px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 34px;
}

.top-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.back,
.source-link {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-weight: 760;
}

.badge {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 820;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 28px;
  align-items: end;
  margin-bottom: 24px;
}

h1 {
  max-width: 780px;
  margin: 0 0 16px;
  font-size: clamp(2.35rem, 5vw, 4.7rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.summary-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  padding: 18px;
}

.summary-card strong {
  display: block;
  color: var(--accent);
  font-size: 1.55rem;
  line-height: 1;
}

.summary-card span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 26px;
}

.toc a {
  padding: 7px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #0f4e43;
  font-size: 0.86rem;
  font-weight: 760;
}

.doc-grid {
  display: grid;
  gap: 16px;
}

section {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 24px;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  line-height: 1.16;
}

h3 {
  margin: 20px 0 8px;
  font-size: 1.04rem;
}

p {
  margin: 0 0 12px;
  color: var(--muted);
}

p:last-child {
  margin-bottom: 0;
}

ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.flow div,
.api-card,
.criteria li {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfb;
}

.flow div {
  min-height: 132px;
  padding: 14px;
}

.flow span {
  color: var(--warm);
  font-size: 0.78rem;
  font-weight: 820;
}

.flow strong {
  display: block;
  margin: 6px 0;
}

.flow p {
  font-size: 0.9rem;
}

.api-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.api-card {
  padding: 14px;
}

.method {
  color: var(--warm);
  font-size: 0.78rem;
  font-weight: 820;
}

code {
  display: inline-block;
  margin: 4px 0 8px;
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9rem;
  font-weight: 760;
}

.criteria {
  padding-left: 0;
  list-style: none;
}

.criteria li {
  padding: 12px 14px;
}

@media (max-width: 820px) {
  main {
    width: min(100% - 24px, 1080px);
    padding-top: 24px;
  }

  .topbar,
  .hero {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .topbar {
    flex-direction: column;
  }

  .summary-card {
    width: 100%;
  }

  .flow,
  .api-grid {
    grid-template-columns: 1fr;
  }
}