* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', sans-serif;
  font-size: 15px;
  line-height: 1.75;
  color: #1f2329;
  background: #f5f6f7;
}

.doc-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid #e5e6eb;
  backdrop-filter: blur(8px);
}

.doc-topbar-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  font-size: 13px;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
}

.lang-switch button {
  border: none;
  background: transparent;
  color: #86909c;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 13px;
}

.lang-switch button:hover {
  color: #1f2329;
}

.lang-switch button.active {
  color: #07c160;
  background: #f0faf4;
  font-weight: 600;
}

.lang-sep {
  color: #c9cdd4;
}

.doc-layout {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 24px 48px;
  display: flex;
  align-items: flex-start;
  gap: 40px;
}

.page {
  flex: 1;
  min-width: 0;
  max-width: 720px;
  padding: 32px 28px 40px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.toc-sidebar {
  position: sticky;
  top: 56px;
  width: 200px;
  flex-shrink: 0;
  max-height: calc(100vh - 72px);
  overflow-y: auto;
  scrollbar-width: thin;
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-item a {
  display: block;
  padding: 6px 8px 6px 14px;
  font-size: 14px;
  line-height: 1.5;
  color: #1f2329;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.toc-item a:hover {
  color: #07c160;
}

.toc-item.active a {
  color: #07c160;
  border-left-color: #07c160;
  font-weight: 500;
}

.doc-title {
  margin: 0 0 28px;
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  color: #1f2329;
}

.section {
  margin-bottom: 28px;
}

.section-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 600;
  color: #1f2329;
  scroll-margin-top: 72px;
}

.section-head.intro {
  color: #07c160;
}

.section-head .bar {
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: #07c160;
  flex-shrink: 0;
}

.section p {
  margin: 0 0 10px;
  color: #4e5969;
}

.section ul {
  margin: 8px 0 10px;
  padding-left: 20px;
  color: #4e5969;
}

.section li {
  margin-bottom: 6px;
}

.footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #e5e6eb;
  text-align: center;
  font-size: 12px;
  color: #86909c;
  line-height: 1.6;
}

.doc-loading,
.doc-error {
  max-width: 720px;
  margin: 48px auto;
  padding: 24px;
  text-align: center;
  color: #86909c;
  background: #fff;
  border-radius: 8px;
}

@media (max-width: 960px) {
  .doc-layout {
    flex-direction: column;
    padding: 16px 16px 40px;
    gap: 0;
  }

  .page {
    max-width: none;
    padding: 24px 16px 32px;
  }

  .toc-sidebar {
    position: sticky;
    top: 48px;
    width: 100%;
    max-height: none;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 12px 0;
    margin-bottom: 12px;
    background: #f5f6f7;
    border-bottom: 1px solid #e5e6eb;
  }

  .toc-list {
    display: flex;
    flex-wrap: nowrap;
    gap: 4px;
    padding: 0 12px;
  }

  .toc-item {
    flex-shrink: 0;
  }

  .toc-item a {
    border-left: none;
    border-radius: 6px;
    padding: 7px 12px;
    white-space: nowrap;
    background: #fff;
  }

  .toc-item.active a {
    border-left: none;
    background: #f0faf4;
  }

  .doc-title {
    font-size: 20px;
  }

  .section-head {
    font-size: 16px;
  }
}