:root {
  --bg: #f5f5f2;
  --paper: #fcfcfa;
  --ink: #232320;
  --muted: #6b6a66;
  --line: #dedcd6;
  --strong-line: #cecbc4;
  --link: #3465c5;
  --code-bg: #efeee9;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    linear-gradient(to right, transparent 0, transparent 88px, rgba(0, 0, 0, 0.03) 88px, rgba(0, 0, 0, 0.03) 89px, transparent 89px) var(--bg);
  color: var(--ink);
  font-family: "Pretendard", "Noto Sans KR", "Segoe UI", sans-serif;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a:hover { text-decoration: underline; }

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  background: var(--code-bg);
  padding: 0.12rem 0.34rem;
  border-radius: 4px;
  font-size: 0.9em;
}

.doc {
  width: min(880px, calc(100% - 36px));
  margin: 0 auto;
  padding: 28px 0 88px;
}

.top-nav {
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.01em;
}

.top-nav a { color: var(--muted); }

.doc-header {
  padding: 12px 0 10px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 40px;
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 760;
}

.lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 22px;
  font-weight: 630;
  line-height: 1.56;
}

.lead-body {
  margin: 16px 0 0;
  max-width: 38em;
  color: var(--muted);
  font-size: 16px;
}

.doc-section {
  margin-top: 38px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.doc-section h2 {
  margin: 0 0 14px;
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.doc-section p { margin: 0 0 14px; }

.plain-list,
.link-list,
.stack-list {
  margin: 0;
  padding-left: 20px;
}

.plain-list li,
.link-list li,
.stack-list li {
  margin: 0 0 12px;
}

.stack-list p {
  margin: 5px 0 0;
  color: var(--muted);
}

.markdown-body {
  font-size: 16px;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  line-height: 1.34;
  letter-spacing: -0.015em;
}

.markdown-body h1 {
  margin: 4px 0 16px;
  font-size: 34px;
  font-weight: 740;
}

.markdown-body h2 {
  margin: 34px 0 14px;
  padding-top: 4px;
  font-size: 22px;
  font-weight: 700;
  border-top: 1px solid var(--line);
}

.markdown-body h3 {
  margin: 24px 0 12px;
  font-size: 18px;
  font-weight: 680;
}

.markdown-body h4 {
  margin: 18px 0 10px;
  font-size: 15px;
  color: var(--muted);
  font-weight: 650;
}

.markdown-body p {
  margin: 0 0 14px;
}

.markdown-body ul,
.markdown-body ol {
  margin: 0 0 16px;
  padding-left: 24px;
}

.markdown-body li {
  margin: 0 0 8px;
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--strong-line);
  margin: 32px 0;
}

.markdown-body blockquote {
  margin: 18px 0;
  padding: 0 0 0 16px;
  border-left: 2px solid var(--strong-line);
  color: var(--muted);
}

.markdown-body pre {
  margin: 16px 0;
  padding: 14px 16px;
  overflow: auto;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.markdown-body pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
}

.markdown-body .mermaid {
  margin: 20px 0 22px;
  padding: 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow-x: auto;
}

@media (max-width: 820px) {
  body {
    background: var(--bg);
  }

  .doc {
    width: min(100% - 22px, 880px);
    padding: 20px 0 64px;
  }

  h1 { font-size: 34px; }
  .lede { font-size: 19px; }
  .lead-body,
  .markdown-body { font-size: 15px; }
  .markdown-body h1 { font-size: 29px; }
  .markdown-body h2 { font-size: 20px; }
}