:root {
  --bg: #f6f1e8;
  --paper: #fffaf3;
  --ink: #1f2a2e;
  --muted: #5c6a70;
  --teal: #1f7a72;
  --teal-d: #155e58;
  --coral: #c45c26;
  --line: #e4d9c8;
  --code-bg: #243033;
  --code-fg: #e8efe8;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font: 18px/1.55 "Segoe UI", "PT Sans", sans-serif;
}

a { color: var(--teal-d); }
a:hover { color: var(--coral); }

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 20px 64px;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(246, 241, 232, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: center;
}

.brand {
  font-weight: 700;
  text-decoration: none;
  color: var(--ink);
  margin-right: 8px;
}

.nav-inner nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.nav-inner nav a {
  text-decoration: none;
  font-size: 14px;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--muted);
}

.nav-inner nav a:hover,
.nav-inner nav a.current {
  background: #e7f3f1;
  color: var(--teal-d);
}

h1, h2, h3, h4 { line-height: 1.25; }
h1 { font-size: 2rem; margin: 1.2em 0 0.5em; }
h2 { font-size: 1.45rem; margin-top: 1.6em; }
h3 { font-size: 1.15rem; }

.lead { font-size: 1.15rem; color: var(--muted); }

img.hero,
.content img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

img.hero { display: block; margin: 8px 0 24px; }

.content img { margin: 8px 0; }

.card-list {
  list-style: none;
  padding: 0;
  margin: 28px 0;
}

.card-list li {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  margin: 0 0 12px;
}

.card-list a {
  display: block;
  padding: 14px 16px;
  text-decoration: none;
  color: inherit;
}

.card-list a:hover { background: #e7f3f1; }
.card-list strong { color: var(--teal-d); }
.card-list span { display: block; color: var(--muted); font-size: 0.95rem; margin-top: 4px; }

table {
  border-collapse: collapse;
  width: 100%;
  background: var(--paper);
  margin: 12px 0 20px;
}

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

th { background: #efe6d8; }

pre, code {
  font-family: Consolas, "Cascadia Mono", monospace;
}

code {
  background: #efe6d8;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.9em;
}

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 14px 16px;
  border-radius: 10px;
  overflow: auto;
}

pre code { background: none; color: inherit; padding: 0; }

blockquote {
  margin: 12px 0;
  padding: 4px 0 4px 16px;
  border-left: 4px solid var(--teal);
  color: var(--muted);
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 28px 0;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.pager a {
  text-decoration: none;
  font-weight: 600;
}

kbd {
  font-family: inherit;
  border: 1px solid var(--line);
  background: #fff;
  padding: 0 6px;
  border-radius: 4px;
  box-shadow: 0 1px 0 var(--line);
}

.footnote { font-size: 0.9rem; color: var(--muted); }

.mermaid { background: var(--paper); padding: 12px; border-radius: 10px; }

@media (max-width: 640px) {
  .nav-inner nav a { font-size: 13px; padding: 4px 8px; }
  h1 { font-size: 1.6rem; }
}