:root {
  --text: #1a1a1a;
  --text-muted: #4a4a4a;
  --bg: #ffffff;
  --bg-muted: #f8fafc;
  --border: #767676;
  --navy: #1B547B;
  --navy-dark: #154163;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.6;
}
a { color: var(--navy); }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 1.25rem; }

.site-header { border-bottom: 1px solid var(--border); background: var(--bg); }
.header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem; padding: 1rem 1.25rem; }
.brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; min-height: 44px; }
.brand img { border-radius: 9999px; display: block; }
.brand-name { font-family: Georgia, serif; font-weight: 700; font-size: 1.25rem; color: var(--navy); }
header nav, .footer-links { display: flex; flex-wrap: wrap; gap: 0.25rem; }
.nav-link, .footer-link {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; min-width: 44px; padding: 0.5rem 0.9rem;
  color: var(--navy); text-decoration: none; font-weight: 600; font-size: 1rem;
  border-radius: 0.5rem;
}
.nav-link:hover, .footer-link:hover, .back-link:hover, .post-card-link:hover .post-card-title { text-decoration: underline; }
.nav-link[aria-current="page"] { background: var(--bg-muted); }

.page-main { padding: 2.5rem 1.25rem 3.5rem; }
.page-main h1 { font-size: 2.25rem; line-height: 1.2; color: var(--text); margin: 0 0 0.75rem; }
.page-intro { font-size: 1.0625rem; color: var(--text-muted); max-width: 42rem; margin: 0 0 2rem; }

.post-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 1.25rem; }
.post-card { border: 1px solid var(--border); border-radius: 0.75rem; }
.post-card-link { display: block; padding: 1.25rem 1.5rem; text-decoration: none; color: inherit; min-height: 44px; }
.post-card-title { margin: 0 0 0.4rem; font-size: 1.375rem; color: var(--navy); }
.post-card-meta { margin: 0 0 0.6rem; color: var(--text-muted); font-size: 1rem; }
.post-card-desc { margin: 0 0 0.75rem; color: var(--text); font-size: 1rem; }
.post-card-cta { color: var(--navy-dark); font-weight: 600; font-size: 1rem; }

.back-link { display: inline-flex; align-items: center; min-height: 44px; padding: 0.5rem 0; color: var(--navy); text-decoration: none; font-weight: 600; margin-bottom: 1rem; font-size: 1rem; }

article h1 { font-size: 2rem; margin: 0 0 0.5rem; color: var(--text); }
.post-meta { color: var(--text-muted); font-size: 1rem; margin: 0 0 1.75rem; }
.post-body { font-size: 1.0625rem; color: var(--text); }
.post-body p { margin: 0 0 1.25rem; }
.post-body h2 { font-size: 1.5rem; margin: 2rem 0 0.75rem; color: var(--text); }
.post-body h3 { font-size: 1.25rem; margin: 1.5rem 0 0.6rem; color: var(--text); }
.post-body ul, .post-body ol { margin: 0 0 1.25rem; padding-left: 1.5rem; }
.post-body li { margin-bottom: 0.5rem; }
.post-body blockquote { margin: 0 0 1.25rem; padding: 0.75rem 1.25rem; border-left: 4px solid var(--navy); background: var(--bg-muted); color: var(--text-muted); }
.post-body a { color: var(--navy-dark); }
.post-body code { background: var(--bg-muted); padding: 0.15rem 0.4rem; border-radius: 0.3rem; font-size: 0.95em; }

.site-footer { border-top: 1px solid var(--border); background: var(--bg-muted); margin-top: 2rem; }
.footer-inner { padding: 2rem 1.25rem; display: flex; flex-direction: column; gap: 1rem; }
.footer-tagline { margin: 0; color: var(--text-muted); font-size: 1rem; max-width: 32rem; }
.footer-copy { margin: 0; color: var(--text-muted); font-size: 1rem; }

@media (max-width: 640px) {
  .page-main h1 { font-size: 1.75rem; }
  article h1 { font-size: 1.6rem; }
}