:root {
  color-scheme: light;
  --bg: #ffffff;
  --ink: #17202c;
  --muted: #576476;
  --line: #d8dee7;
  --soft: #f6f8fb;
  --accent: #126b5b;
  --accent-2: #245a9c;
  --code-bg: #f1f4f8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-padding-top: 82px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a {
  color: var(--accent-2);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1200px, calc(100% - 40px));
  min-height: 64px;
  margin: 0 auto;
}

.site-title {
  color: var(--ink);
  font-size: 18px;
  font-weight: 750;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
}

.site-nav a {
  color: var(--muted);
  font-weight: 650;
}

.page-shell {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 40px;
  width: min(1200px, calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 64px;
}

.sidebar {
  position: sticky;
  top: 86px;
  align-self: start;
  max-height: calc(100vh - 108px);
  overflow: auto;
  padding: 4px 14px 14px 0;
  border-right: 1px solid var(--line);
}

.sidebar__title {
  margin: 16px 0 8px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 750;
}

.sidebar__title:first-child {
  margin-top: 0;
}

.sidebar a {
  display: block;
  padding: 5px 0;
  color: var(--muted);
  font-size: 14px;
}

.content {
  min-width: 0;
  max-width: 860px;
}

.content h1 {
  margin: 0 0 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 38px;
  line-height: 1.2;
  letter-spacing: 0;
}

.content h2 {
  margin: 38px 0 14px;
  padding-top: 8px;
  color: var(--ink);
  font-size: 27px;
  line-height: 1.3;
  letter-spacing: 0;
}

.content h3 {
  margin: 28px 0 10px;
  color: var(--ink);
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: 0;
}

.content p,
.content ul,
.content ol,
.content table,
.content blockquote,
.content pre {
  margin-top: 0;
  margin-bottom: 18px;
}

.content img {
  max-width: 100%;
  height: auto;
}

.content table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.content th,
.content td {
  padding: 9px 11px;
  border: 1px solid var(--line);
  vertical-align: top;
}

.content th {
  background: var(--soft);
  font-weight: 750;
}

.content code {
  padding: 0.12em 0.28em;
  border-radius: 4px;
  background: var(--code-bg);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.92em;
}

.content pre {
  overflow-x: auto;
  padding: 16px;
  border-radius: 8px;
  background: var(--code-bg);
}

.content pre code {
  padding: 0;
  background: transparent;
}

.content blockquote {
  margin-left: 0;
  padding: 12px 16px;
  border-left: 4px solid var(--accent);
  background: #eef8f5;
  color: #31443f;
}

@media (max-width: 880px) {
  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    padding: 12px 0;
  }

  .page-shell {
    display: block;
    padding-top: 24px;
  }

  .sidebar {
    position: static;
    max-height: none;
    margin-bottom: 26px;
    padding: 0 0 18px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .content h1 {
    font-size: 30px;
  }

  .content h2 {
    font-size: 24px;
  }
}