/* ── 基础排版 ── */
body {
  max-width: 680px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  font-family: "Georgia", "Noto Serif SC", serif;
  font-size: 1rem;
  line-height: 1.9;
  color: #1a1a1a;
  background: #fafaf8;
}

/* ── 标题 ── */
h1, h2, h3 {
  font-weight: bold;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}
h1 { font-size: 1.8rem; }
h2 { font-size: 1.3rem; }
h3 { font-size: 1.1rem; }

/* ── 段落与间距 ── */
p { margin: 0.8rem 0; }

/* ── 代码 ── */
code {
  font-family: "Courier New", monospace;
  font-size: 0.9em;
  background: #efefeb;
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
pre {
  background: #efefeb;
  padding: 1rem;
  overflow-x: auto;
  border-radius: 4px;
}
pre code {
  background: none;
  padding: 0;
}

/* ── 引用 ── */
blockquote {
  border-left: 3px solid #1a1a1a;
  margin: 1rem 0;
  padding: 0.2rem 1rem;
  color: #555;
}

/* ── 表格 ── */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
}
th, td {
  border: 1px solid #ccc;
  padding: 0.4rem 0.8rem;
  text-align: left;
}
th { background: #efefeb; }

/* ── 分隔线 ── */
hr {
  border: none;
  border-top: 1px solid #ccc;
  margin: 2rem 0;
}

/* ── 删除线 ── */
del { color: #999; }

/* ── 卡片 ── */
.card {
  border: 1px solid black;
  padding: 1rem 1.2rem;
  margin: 1rem 0;
}

/* ── KaTeX 字号对齐 ── */
.katex { font-size: 1em; }