:root {
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --soft: #f8fafc;
  --bg: #ffffff;
  --nav-bg: #111827;
  --nav-text: #f9fafb;
  --link: #1d4ed8;
  --maxw: 980px;
  --article-width: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

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

a:hover { text-decoration: underline; }

a:focus-visible,
button:focus-visible {
  outline: 3px solid #93c5fd;
  outline-offset: 3px;
}

nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 1rem;
  color: var(--nav-text);
  background: var(--nav-bg);
}

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

nav a[aria-current="page"] {
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 0.3rem;
}

.menu-toggle {
  display: none;
  margin: 0 auto 0.75rem;
  padding: 0.5rem 0.9rem;
  border: 0;
  color: white;
  background: #374151;
  cursor: pointer;
}

main {
  width: min(100% - 2.5rem, var(--maxw));
  margin: 0 auto;
  padding: 3rem 0 4rem;
}

.blog-header,
.post-list,
.article,
.back-link {
  max-width: var(--article-width);
  margin-right: auto;
  margin-left: auto;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--link);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.25;
}

h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 6vw, 3rem);
  letter-spacing: -0.025em;
}

h2 {
  margin: 2.2rem 0 0.7rem;
  font-size: 1.45rem;
}

.lede {
  margin: 0;
  color: #4b5563;
  font-size: 1.15rem;
}

.post-list {
  margin-top: 2.5rem;
  border-top: 1px solid var(--line);
}

.post-card {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}

.post-card h2 {
  margin: 0.25rem 0 0.45rem;
  font-size: 1.35rem;
}

.post-card p { margin: 0.4rem 0 0; }

.post-card .read-more {
  display: inline-block;
  margin-top: 0.65rem;
  font-weight: 600;
}

.meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.article header {
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.article p,
.article li {
  max-width: 72ch;
}

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

.article li { margin-bottom: 0.5rem; }

.callout {
  margin: 1.7rem 0;
  padding: 1rem 1.15rem;
  border-left: 4px solid #2563eb;
  background: var(--soft);
}

.callout p { margin: 0; }

.back-link { margin-top: 2.5rem; }

footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 700px) {
  nav ul {
    display: none;
    flex-direction: column;
    align-items: center;
  }

  nav ul.active { display: flex; }
  .menu-toggle { display: block; }
  main { padding-top: 2rem; }
}