:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --border: #e4e7ec;
  --accent: #0f6cbd;
  --accent-hover: #0b5799;
  --code-bg: #f2f4f7;
  --shadow: 0 12px 36px rgba(16, 24, 40, .08);
  --radius: 14px;
  --content-width: 920px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}
.topbar-inner {
  max-width: 1260px;
  min-height: 66px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: .03em;
}
.brand-mark { font-size: 22px; font-weight: 800; color: var(--accent); }
.brand-text { font-size: 16px; font-weight: 700; }
.toolbar { display: flex; gap: 8px; }
.button {
  appearance: none;
  border: 1px solid var(--accent);
  border-radius: 9px;
  background: var(--accent);
  color: white;
  padding: 9px 13px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.button:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.button-secondary { background: white; color: var(--text); border-color: var(--border); }
.button-secondary:hover { background: #f9fafb; border-color: #d0d5dd; }

.layout {
  max-width: 1260px;
  margin: 0 auto;
  padding: 30px 24px 60px;
  display: grid;
  grid-template-columns: 245px minmax(0, 1fr);
  gap: 28px;
}
.sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow: auto;
  padding: 16px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.sidebar-title { font-size: 13px; font-weight: 800; text-transform: uppercase; color: var(--muted); letter-spacing: .07em; margin: 0 8px 10px; }
.toc a {
  display: block;
  padding: 6px 8px;
  border-radius: 7px;
  color: #344054;
  text-decoration: none;
  font-size: 14px;
  line-height: 1.35;
}
.toc a:hover { background: #f2f4f7; color: var(--accent); }
.toc a.level-3 { padding-left: 20px; font-size: 13px; color: var(--muted); }
.toc a.level-4 { padding-left: 32px; font-size: 12px; color: var(--muted); }

.content-wrap {
  min-width: 0;
  max-width: var(--content-width);
  width: 100%;
}
.status,
.markdown-body {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.status { padding: 36px; color: var(--muted); }
.status.error { color: #b42318; background: #fffbfa; border-color: #fecdca; }

.markdown-body { padding: 46px 54px 58px; overflow-wrap: anywhere; }
.markdown-body > :first-child { margin-top: 0; }
.markdown-body > :last-child { margin-bottom: 0; }
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  line-height: 1.25;
  color: #101828;
  scroll-margin-top: 92px;
}
.markdown-body h1 { font-size: 2.15rem; margin: 0 0 1.2rem; padding-bottom: .7rem; border-bottom: 1px solid var(--border); }
.markdown-body h2 { font-size: 1.55rem; margin-top: 2.3rem; padding-bottom: .42rem; border-bottom: 1px solid #eef0f3; }
.markdown-body h3 { font-size: 1.22rem; margin-top: 1.8rem; }
.markdown-body h4 { font-size: 1.05rem; margin-top: 1.5rem; }
.markdown-body p { margin: 1rem 0; }
.markdown-body a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
.markdown-body a:hover { color: var(--accent-hover); }
.markdown-body strong { color: #101828; }
.markdown-body ul,
.markdown-body ol { padding-left: 1.6rem; }
.markdown-body li { margin: .3rem 0; }
.markdown-body blockquote {
  margin: 1.4rem 0;
  padding: .5rem 1rem;
  border-left: 4px solid #84caff;
  background: #f5fbff;
  color: #475467;
}
.markdown-body blockquote > :first-child { margin-top: 0; }
.markdown-body blockquote > :last-child { margin-bottom: 0; }
.markdown-body code {
  padding: .15em .38em;
  background: var(--code-bg);
  border-radius: 5px;
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: .9em;
}
.markdown-body pre {
  position: relative;
  overflow: auto;
  padding: 18px 20px;
  border-radius: 10px;
  background: #101828;
  color: #f2f4f7;
  line-height: 1.55;
}
.markdown-body pre code { padding: 0; background: transparent; color: inherit; font-size: 13px; }
.markdown-body hr { height: 1px; margin: 2rem 0; border: 0; background: var(--border); }
.markdown-body img { display: block; max-width: 100%; height: auto; margin: 1.5rem auto; border-radius: 8px; }
.markdown-body table { width: 100%; border-collapse: collapse; margin: 1.4rem 0; font-size: 14px; }
.markdown-body th,
.markdown-body td { padding: 10px 12px; border: 1px solid var(--border); text-align: left; vertical-align: top; }
.markdown-body th { background: #f9fafb; font-weight: 700; }
.markdown-body .task-list { list-style: none; padding-left: .3rem; }
.markdown-body .task-list input { margin-right: .5rem; }

.page-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin: 16px 4px 0;
  color: #98a2b3;
  font-size: 12px;
}

@media (max-width: 900px) {
  .layout { display: block; padding: 18px 14px 42px; }
  .sidebar { position: static; max-height: none; margin-bottom: 14px; }
  .markdown-body { padding: 30px 24px 42px; }
  .topbar-inner { padding: 0 14px; }
}
@media (max-width: 560px) {
  .brand-text { display: none; }
  .button { padding: 8px 10px; font-size: 13px; }
  .markdown-body { padding: 25px 18px 36px; border-radius: 10px; }
  .markdown-body h1 { font-size: 1.7rem; }
  .markdown-body h2 { font-size: 1.35rem; }
  .page-footer { display: block; }
}

@media print {
  body { background: white; }
  .topbar, .sidebar, .page-footer { display: none !important; }
  .layout { display: block; max-width: none; padding: 0; }
  .content-wrap { max-width: none; }
  .markdown-body { border: 0; box-shadow: none; padding: 0; }
  .markdown-body a { color: inherit; text-decoration: none; }
}