body {
  margin: 0;
  font-family: "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  background: #f7f4ed;
  color: #1f2937;
}

.page {
  max-width: 1320px;
  margin: 0 auto;
  padding: 32px 20px 72px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.title-group h1 {
  margin: 0 0 6px;
  font-size: 34px;
  line-height: 1.15;
}

.title-group p {
  margin: 0;
  color: #6b7280;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 16px;
  border-radius: 12px;
  border: 1px solid #d9d2c5;
  color: #0f766e;
  background: #fffdf8;
  text-decoration: none;
  font-weight: 600;
}

.content-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 24px;
  background: #fffdf8;
  border: 1px solid #e8dfd1;
  border-radius: 24px;
  padding: 20px 18px;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.06);
}

.toc-header {
  margin-bottom: 14px;
}

.toc-title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.toc-desc {
  margin: 6px 0 0;
  color: #6b7280;
  font-size: 13px;
  line-height: 1.6;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc-link {
  display: block;
  padding: 8px 10px;
  border-radius: 10px;
  color: #374151;
  text-decoration: none;
  line-height: 1.5;
  font-size: 14px;
}

.toc-link:hover {
  background: #f4efe5;
  color: #0f766e;
}

.toc-link.level-1 {
  font-weight: 700;
}

.toc-link.level-2 {
  padding-left: 20px;
}

.toc-link.level-3 {
  padding-left: 30px;
  color: #6b7280;
}

.toc-empty {
  margin: 0;
  color: #6b7280;
  font-size: 14px;
  line-height: 1.7;
}

.doc-shell {
  min-width: 0;
}

.doc {
  background: #fffdf8;
  border: 1px solid #e8dfd1;
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.06);
}

.doc h1,
.doc h2,
.doc h3,
.doc h4 {
  color: #111827;
}

.doc h1 {
  margin-top: 0;
  font-size: 32px;
}

.doc h2 {
  margin-top: 36px;
  font-size: 26px;
}

.doc h3 {
  margin-top: 28px;
  font-size: 20px;
}

.doc p,
.doc li {
  line-height: 1.8;
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 24px;
  overflow: hidden;
  border-radius: 14px;
}

.doc th,
.doc td {
  border: 1px solid #e5ded1;
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.doc th {
  background: #f5efe3;
}

.doc pre {
  overflow: auto;
  padding: 16px;
  border-radius: 14px;
  background: #f4f4f0;
}

.doc code {
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
}

.doc blockquote {
  margin: 20px 0;
  padding: 4px 0 4px 16px;
  border-left: 4px solid #d6c8ae;
  color: #4b5563;
}

.doc hr {
  border: 0;
  border-top: 1px solid #e8dfd1;
  margin: 32px 0;
}

.doc a {
  color: #0f766e;
}

.doc .mermaid {
  margin: 20px 0;
  overflow: auto;
  background: #fff;
  border: 1px solid #e8dfd1;
  border-radius: 16px;
  padding: 12px;
}

.error {
  color: #b91c1c;
  line-height: 1.7;
}

html {
  scroll-behavior: smooth;
}

@media (max-width: 680px) {
  .page {
    padding-top: 24px;
  }

  .title-group h1 {
    font-size: 28px;
  }

  .doc {
    padding: 20px;
  }
}

@media (max-width: 980px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }
}