:root {
  color-scheme: light;
  --bg: #ffffff;
  --text: #171717;
  --muted: #666666;
  --line: #e5e5e5;
  --soft: #f7f7f7;
  --link: #111111;
  --max: 760px;
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.68;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 56px;
  padding: 0 32px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
}

.site-title {
  font-weight: 650;
  letter-spacing: 0;
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 16px;
  color: var(--muted);
  font-size: 14px;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.page-shell {
  width: min(100% - 40px, var(--max));
  margin: 0 auto;
  padding: 48px 0 96px;
}

article {
  min-width: 0;
}

h1,
h2,
h3,
h4 {
  color: var(--text);
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  margin: 0 0 28px;
  font-size: 2.15rem;
}

h2 {
  margin: 44px 0 12px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  font-size: 1.45rem;
}

h3 {
  margin: 30px 0 10px;
  font-size: 1.12rem;
}

p,
ul,
ol,
blockquote,
pre,
table {
  margin: 0 0 18px;
}

ul,
ol {
  padding-left: 1.35rem;
}

li + li {
  margin-top: 4px;
}

blockquote {
  padding-left: 16px;
  border-left: 3px solid var(--line);
  color: var(--muted);
}

code {
  padding: 2px 5px;
  border-radius: 4px;
  background: var(--soft);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
}

pre {
  overflow-x: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfbfb;
}

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

img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th,
td {
  padding: 8px 10px;
  border: 1px solid var(--line);
  vertical-align: top;
}

th {
  background: var(--soft);
  text-align: left;
}

.meta {
  margin-top: -14px;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 14px;
}

.page-list {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  padding: 0;
  list-style: none;
}

.page-list a {
  display: block;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
}

.page-list strong {
  display: block;
  font-size: 1.05rem;
}

.page-list span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.floating-toc {
  position: fixed;
  top: 88px;
  right: 32px;
  width: 236px;
  max-height: calc(100vh - 120px);
  overflow: auto;
  padding: 14px 0 14px 18px;
  border-left: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
  color: var(--muted);
  font-size: 13px;
}

.toc-title {
  margin-bottom: 8px;
  color: var(--text);
  font-weight: 650;
}

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

.floating-toc li {
  margin: 0 0 6px;
}

.floating-toc .toc-level-3 {
  padding-left: 12px;
}

.floating-toc a {
  color: var(--muted);
  text-decoration: none;
}

.floating-toc a:hover {
  color: var(--text);
  text-decoration: underline;
}

.empty-state {
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

@media (max-width: 1180px) {
  .floating-toc {
    display: none;
  }
}

@media (max-width: 720px) {
  .site-header {
    padding: 0 20px;
  }

  .page-shell {
    width: min(100% - 32px, var(--max));
    padding-top: 34px;
  }

  h1 {
    font-size: 1.72rem;
  }
}