:root {
  --bg: #f6f1e8;
  --paper: #fffdf8;
  --ink: #1e2723;
  --muted: #66736c;
  --line: #ded3c1;
  --accent: #0f766e;
  --code-bg: #ebe3d4;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  line-height: 1.72;
}

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

a:hover {
  text-decoration: underline;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  gap: 1rem;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.94);
  backdrop-filter: blur(10px);
}

.layout {
  display: grid;
  grid-template-columns: minmax(16rem, 22rem) minmax(0, 1fr);
  gap: 1.25rem;
  width: min(1500px, calc(100% - 2rem));
  margin: 1rem auto 4rem;
}

.toc {
  position: sticky;
  top: 4rem;
  align-self: start;
  max-height: calc(100vh - 5rem);
  overflow: auto;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: var(--paper);
}

.toc h2 {
  margin-top: 0;
}

.toc ol {
  padding-left: 1.1rem;
}

.toc li {
  margin: 0.35rem 0;
  font-size: 0.9rem;
}

.toc-level-2 {
  margin-left: 0.75rem;
}

.toc-level-3 {
  margin-left: 1.5rem;
}

.page {
  min-width: 0;
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--paper);
  box-shadow: 0 18px 45px rgba(48, 38, 25, 0.08);
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.28;
  margin: 1.8em 0 0.55em;
}

h1 {
  margin-top: 0;
}

p {
  margin: 0.72em 0;
}

code {
  padding: 0.1rem 0.35rem;
  border-radius: 0.35rem;
  background: var(--code-bg);
}

pre {
  overflow: auto;
  padding: 1rem;
  border-radius: 0.75rem;
  background: #1f2a26;
  color: #f1f5ee;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

td, th {
  padding: 0.65rem;
  border: 1px solid var(--line);
  vertical-align: top;
}

.raw-index {
  width: min(960px, calc(100% - 2rem));
  margin: 2rem auto;
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--paper);
}

.raw-index li {
  margin: 0.55rem 0;
}

.raw-index span {
  color: var(--muted);
}

@media (max-width: 900px) {
  .layout {
    display: block;
    width: 100%;
    margin: 0;
  }

  .toc {
    position: static;
    max-height: none;
    margin: 0;
    border-radius: 0;
    border-left: 0;
    border-right: 0;
  }

  .page {
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    padding: 1rem;
  }

  .topbar {
    position: static;
    flex-wrap: wrap;
  }
}