:root {
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #16a34a;
  --brand-dark: #15803d;
  --card: #f8fafc;
  --max: 1240px;
  --narrow: 880px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
}

a { color: var(--brand-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.container.narrow { max-width: var(--narrow); }
.mute { color: var(--muted); }

/* Header / footer */
.site { display: flex; flex-direction: column; min-height: 100vh; }
.site-header { border-bottom: 1px solid var(--line); position: sticky; top: 0; background: rgba(255,255,255,.9); backdrop-filter: blur(8px); z-index: 10; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 8px; color: var(--fg); font-weight: 800; }
.brand svg { width: 22px; height: 22px; color: var(--brand); }
.brand-word { font-size: 17px; }
.brand-app { color: var(--brand); }
.brand-sub { color: var(--muted); font-weight: 600; font-size: 13px; padding-left: 6px; border-left: 1px solid var(--line); margin-left: 4px; }
.site-nav { display: flex; gap: 18px; font-size: 14px; font-weight: 600; }
.site-nav a { color: var(--muted); }
.site-main { flex: 1; padding: 36px 0 64px; }
.site-footer { border-top: 1px solid var(--line); padding: 22px 0; color: var(--muted); font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* List hero */
.list-hero { margin-bottom: 28px; }
.list-hero h1 { font-size: 34px; line-height: 1.15; margin: 4px 0 8px; letter-spacing: -.02em; }
.list-hero .lead { color: var(--muted); font-size: 18px; max-width: 60ch; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: 12px; font-weight: 700; color: var(--brand-dark); margin: 0; }

/* Cards */
.card-grid { display: grid; grid-template-columns: 1fr; gap: 22px; }
.post-card { border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: #fff; transition: box-shadow .15s, transform .15s; }
.post-card:hover { box-shadow: 0 8px 30px rgba(15,23,42,.08); transform: translateY(-2px); }
.card-link { color: inherit; display: block; }
.card-link:hover { text-decoration: none; }
.card-media { aspect-ratio: 16 / 9; background: var(--card); overflow: hidden; }
.card-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-body { padding: 16px 18px 20px; }
.card-cat { display: inline-block; font-size: 12px; font-weight: 700; color: var(--brand-dark); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 6px; }
.card-body h2 { font-size: 20px; line-height: 1.25; margin: 2px 0 8px; }
.card-excerpt { color: var(--muted); font-size: 15px; margin: 0 0 12px; }
.card-meta { font-size: 13px; color: var(--muted); display: flex; gap: 6px; }

/* Pager */
.pager { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 36px; }
.pager-info { color: var(--muted); font-size: 14px; }
.btn { display: inline-block; border: 1px solid var(--line); border-radius: 8px; padding: 8px 14px; font-weight: 600; font-size: 14px; color: var(--fg); background: #fff; }
.btn:hover { border-color: var(--brand); text-decoration: none; }

/* Post */
.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 18px; display: flex; gap: 8px; }
.post-head h1 { font-size: 34px; line-height: 1.15; letter-spacing: -.02em; margin: 6px 0 10px; }
.post-meta { color: var(--muted); font-size: 14px; display: flex; gap: 8px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.tag { font-size: 13px; color: var(--brand-dark); background: #ecfdf5; border-radius: 999px; padding: 3px 10px; font-weight: 600; }
.post-hero { margin: 24px 0 8px; }
.post-hero img { width: 100%; height: auto; border-radius: 14px; display: block; background: var(--card); }

.tldr { background: #ecfdf5; border: 1px solid #bbf7d0; border-radius: 12px; padding: 14px 16px; margin: 24px 0; }
.tldr-label { display: inline-block; font-weight: 800; font-size: 12px; letter-spacing: .06em; color: var(--brand-dark); margin-bottom: 4px; }
.tldr p { margin: 0; }

/* Prose */
.prose { font-size: 17.5px; }
.prose h2 { font-size: 26px; margin: 38px 0 12px; letter-spacing: -.01em; }
.prose h3 { font-size: 21px; margin: 28px 0 10px; }
.prose p { margin: 0 0 18px; }
.prose ul, .prose ol { margin: 0 0 18px; padding-left: 24px; }
.prose li { margin: 6px 0; }
.prose img { max-width: 100%; height: auto; border-radius: 10px; }
.prose pre { background: #0f172a; color: #e2e8f0; padding: 16px; border-radius: 10px; overflow-x: auto; font-size: 14px; }
.prose code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .92em; }
.prose :not(pre) > code { background: var(--card); padding: 2px 6px; border-radius: 5px; }
.prose blockquote { border-left: 3px solid var(--brand); margin: 18px 0; padding: 4px 16px; color: var(--muted); }

/* FAQ */
.faq { margin: 40px 0; }
.faq h2 { font-size: 24px; margin-bottom: 12px; }
.faq details { border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin-bottom: 10px; }
.faq summary { font-weight: 700; cursor: pointer; }
.faq-answer { margin-top: 8px; color: var(--fg); }

/* CTA */
.cta-box { background: var(--fg); color: #fff; border-radius: 16px; padding: 28px 24px; margin: 44px 0; text-align: center; }
.cta-box h2 { margin: 0 0 8px; font-size: 24px; color: #fff; }
.cta-box p { margin: 0 0 18px; color: #cbd5e1; }
.cta-btn { display: inline-block; background: var(--brand); color: #fff; font-weight: 700; padding: 12px 22px; border-radius: 10px; }
.cta-btn:hover { background: var(--brand-dark); text-decoration: none; }

/* Related */
.related { margin: 40px 0 0; border-top: 1px solid var(--line); padding-top: 22px; }
.related h2 { font-size: 20px; margin-bottom: 10px; }
.related ul { list-style: none; padding: 0; margin: 0; }
.related li { margin: 8px 0; font-weight: 600; }

.read-end { display: block; height: 1px; }

.preview-flag { background: #fef3c7; border: 1px solid #fcd34d; color: #92400e; border-radius: 10px; padding: 10px 14px; margin-bottom: 18px; font-size: 14px; font-weight: 600; }

@media (min-width: 640px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .card-grid { grid-template-columns: repeat(3, 1fr); }
  body { font-size: 18px; }
  .list-hero h1, .post-head h1 { font-size: 42px; }
}