:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #5f6b7a;
  --border: #d8dee8;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --code-bg: #eef2f6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent);
}

.container {
  width: min(100% - 32px, 960px);
  margin: 0 auto;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.site-title {
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--text);
}

.page-content {
  padding: 48px 0 64px;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
  padding: 24px 0;
}

h1,
h2,
h3 {
  line-height: 1.25;
  margin: 2rem 0 0.75rem;
}

h1 {
  font-size: 2.25rem;
  margin-top: 0;
}

h2 {
  font-size: 1.45rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.35rem;
}

h3 {
  font-size: 1.15rem;
}

p,
ul,
ol,
table,
pre {
  margin: 0 0 1.15rem;
}

ul,
ol {
  padding-left: 1.4rem;
}

code {
  background: var(--code-bg);
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  padding: 0.12rem 0.3rem;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow-x: auto;
  padding: 1rem;
}

pre code {
  background: transparent;
  padding: 0;
}

table {
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
  width: 100%;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #edf4f3;
}

blockquote {
  border-left: 4px solid var(--accent);
  color: var(--muted);
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
}

.lead {
  color: var(--muted);
  font-size: 1.12rem;
}

@media (max-width: 680px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    padding: 16px 0;
  }

  h1 {
    font-size: 1.85rem;
  }
}