:root {
  --bg: #f7f9f8;
  --surface: #ecf2f1;
  --ink: #142a33;
  --muted: #5b6b72;
  --accent: #0f7f86;
  --accent-dark: #0b5e64;
  --deep: #0f3b46;
  --line: #d6e2e0;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 12px; top: 12px; background: #fff; padding: 8px 12px; z-index: 10; }

.site-header { background: var(--deep); color: #e8f6f3; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 14px; padding-bottom: 14px; flex-wrap: wrap; }
.logo { color: #fff; font-weight: 800; letter-spacing: 0.04em; text-decoration: none; font-size: 1.15rem; }
.site-header nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-header nav a { color: #cfe9e5; text-decoration: none; font-size: 0.95rem; }
.site-header nav a:hover, .site-header nav a[aria-current="page"] { color: #fff; text-decoration: underline; text-underline-offset: 4px; }

main.prose { padding-top: 36px; padding-bottom: 56px; }

.prose h1 { font-size: 2.1rem; line-height: 1.2; margin: 0 0 18px; color: var(--deep); }
.prose h2 { font-size: 1.45rem; line-height: 1.3; margin: 40px 0 12px; color: var(--deep); }
.prose h3 { font-size: 1.15rem; margin: 30px 0 8px; }
.prose h4 { font-size: 1rem; margin: 24px 0 6px; }
.prose p, .prose ul, .prose ol { margin: 0 0 16px; }
.prose li { margin-bottom: 6px; }
.prose a { color: var(--accent); text-underline-offset: 3px; }
.prose a:hover { color: var(--accent-dark); }
.prose strong { color: var(--ink); }
.prose blockquote { margin: 0 0 16px; padding: 10px 16px; background: var(--surface); border-left: 4px solid var(--accent); }

.table-wrap { overflow-x: auto; margin: 0 0 20px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.93rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--surface); }

.site-footer { background: var(--surface); border-top: 1px solid var(--line); color: var(--muted); }
.footer-inner { padding-top: 24px; padding-bottom: 28px; }
.site-footer .tagline { margin: 0 0 10px; color: var(--ink); }
.site-footer nav { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 10px; }
.site-footer nav a { color: var(--accent-dark); }
.small { font-size: 0.85rem; margin: 0; }

@media (max-width: 480px) {
  body { font-size: 16px; }
  .prose h1 { font-size: 1.7rem; }
}