:root {
  --bg: #fafaf8;
  --surface: #ffffff;
  --ink: #1f2430;
  --muted: #5b6472;
  --accent: #3b5bdb;
  --accent-soft: #e7ecfb;
  --border: #e4e2dc;
  --code-bg: #f4f3ef;
  --max: 72ch;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161c;
    --surface: #1c1f27;
    --ink: #e8e8e4;
    --muted: #9aa1ad;
    --accent: #8da2f0;
    --accent-soft: #262c40;
    --border: #2b2f3a;
    --code-bg: #22252e;
  }
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
a, button { touch-action: manipulation; }
a:focus, button:focus { outline: none; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}
header.site {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
header.site .inner {
  max-width: 960px; margin: 0 auto; padding: 0.7rem 1.2rem;
  display: flex; align-items: center; gap: 0.6rem 1.2rem; flex-wrap: wrap;
}
header.site a.brand {
  font-weight: 700; color: var(--ink); text-decoration: none; letter-spacing: -0.01em;
  font-size: 1rem; line-height: 1.3;
  display: inline-flex; align-items: center; gap: 0.5rem;
}
header.site a.brand .brand-mark { flex-shrink: 0; border-radius: 6px; }
header.site nav { display: flex; align-items: center; gap: 0.3rem 0.9rem; margin-left: auto; flex-wrap: wrap; }
header.site nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; padding: 0.3rem 0.05rem; }
header.site nav a:hover, header.site nav a.active { color: var(--accent); }
header.site nav a.lang-switch { border: 1px solid var(--border); border-radius: 999px; padding: 0.25rem 0.8rem; font-size: 0.82rem; }
header.site nav a.lang-switch:hover { border-color: var(--accent); }
header.site nav a.buy-cta { background: var(--accent); color: #fff !important; border-radius: 999px; padding: 0.4rem 1rem; font-weight: 600; font-size: 0.85rem; }
header.site nav a.buy-cta:hover { opacity: 0.9; }

@media (max-width: 640px) {
  header.site .inner { padding: 0.6rem 1rem; gap: 0.5rem 0.7rem; }
  header.site a.brand { width: 100%; font-size: 0.98rem; }
  header.site nav { margin-left: 0; width: 100%; gap: 0.45rem 0.6rem; }
  header.site nav a:not(.lang-switch):not(.buy-cta) { font-size: 0.88rem; }
}

main.prose { max-width: var(--max); margin: 0 auto; padding: 2.5rem 1.2rem 4rem; }
main.prose h1 { font-size: 2rem; line-height: 1.25; letter-spacing: -0.02em; }
main.prose h2 { margin-top: 2.4em; font-size: 1.4rem; letter-spacing: -0.01em; border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
main.prose h3 { margin-top: 1.8em; font-size: 1.12rem; }
main.prose a { color: var(--accent); }
main.prose blockquote { margin: 1.4em 0; padding: 0.2em 1.2em; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0; }
main.prose code { background: var(--code-bg); padding: 0.12em 0.35em; border-radius: 4px; font-size: 0.9em; }
main.prose pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; padding: 1.1em 1.2em; overflow-x: auto; line-height: 1.45; }
main.prose pre code { background: none; padding: 0; }
main.prose table { border-collapse: collapse; width: 100%; margin: 1.4em 0; font-size: 0.93rem; display: block; overflow-x: auto; }
main.prose th, main.prose td { border: 1px solid var(--border); padding: 0.55em 0.8em; text-align: left; vertical-align: top; }
main.prose th { background: var(--accent-soft); }
main.prose hr { border: none; border-top: 1px solid var(--border); margin: 2.5em 0; }
main.prose img { max-width: 100%; }
main.prose ul li, main.prose ol li { margin: 0.25em 0; }

nav.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3.5rem; padding-top: 1.4rem; border-top: 1px solid var(--border); }
nav.pager a { text-decoration: none; color: var(--accent); max-width: 46%; font-size: 0.95rem; }
nav.pager span.dir { display: block; font-size: 0.8rem; color: var(--muted); }

@media (max-width: 480px) {
  nav.pager a { font-size: 0.85rem; }
}

footer.site { border-top: 1px solid var(--border); color: var(--muted); font-size: 0.88rem; }
footer.site .inner { max-width: 960px; margin: 0 auto; padding: 1.4rem 1.2rem; }

/* Landing page */
.hero { max-width: 960px; margin: 0 auto; padding: 4.5rem 1.2rem 3rem; text-align: center; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.1rem); line-height: 1.12; letter-spacing: -0.03em; margin: 0 0 0.6rem; }
.hero p.sub { font-size: 1.2rem; color: var(--muted); max-width: 44ch; margin: 0 auto 2rem; }
.hero-actions { display: flex; gap: 0.7rem; justify-content: center; flex-wrap: wrap; }
.hero .cta { display: inline-block; background: var(--accent); color: #fff; text-decoration: none; padding: 0.85rem 1.7rem; border-radius: 10px; font-weight: 600; }
.hero .cta.secondary { background: var(--accent-soft); color: var(--accent); }
.badges { display: flex; gap: 0.6rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2rem; }
.badges span { background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 0.25rem 0.9rem; font-size: 0.85rem; color: var(--muted); }

@media (max-width: 640px) {
  .hero { padding: 3rem 1.2rem 2.2rem; }
  .hero p.sub { font-size: 1.05rem; }
  .hero-actions { flex-direction: column; align-items: stretch; max-width: 340px; margin: 0 auto; }
  .hero .cta { text-align: center; width: 100%; }
}

section.block { max-width: 960px; margin: 0 auto; padding: 2.2rem 1.2rem; }
section.block > h2 { font-size: 1.6rem; letter-spacing: -0.02em; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; margin-top: 1.4rem; }

@media (max-width: 480px) {
  .grid { grid-template-columns: 1fr; }
  section.block { padding: 1.8rem 1rem; }
  section.block > h2 { font-size: 1.35rem; }
  .paywall { padding: 1.4rem 1.25rem; }
  main.prose { padding: 2rem 1rem 3rem; }
  main.prose h1 { font-size: 1.6rem; }
}
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 1.1rem 1.2rem; text-decoration: none; color: var(--ink); display: block; transition: border-color 0.15s, transform 0.15s; }
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card .num { font-size: 0.78rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.06em; }
.card h3 { margin: 0.3rem 0 0.4rem; font-size: 1.05rem; line-height: 1.35; }
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.5; }
.pill-list { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-top: 1.2rem; }
.pill-list a { background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 0.55rem 1rem; font-size: 0.9rem; color: var(--ink); text-decoration: none; line-height: 1.3; }
.pill-list a:hover { border-color: var(--accent); color: var(--accent); }

/* Paywall / upsell */
.paywall { background: var(--accent-soft); border: 1px solid var(--border); border-radius: 14px; padding: 1.7rem 1.9rem; margin-top: 2.2rem; }
.paywall-kicker { font-size: 0.8rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.06em; }
.paywall h2 { margin-top: 0.4em; border-bottom: none; padding-bottom: 0; font-size: 1.35rem; }
.paywall p { margin: 0.7em 0; }
.paywall-outline-heading { font-weight: 600; margin-top: 1em; margin-bottom: 0.3em; }
.paywall ul.paywall-outline { margin: 0 0 1.1em; padding-left: 1.3em; }
.paywall ul.paywall-outline li { margin: 0.2em 0; color: var(--muted); }
.paywall .cta { display: inline-block; background: var(--accent); color: #fff; text-decoration: none; padding: 0.75rem 1.6rem; border-radius: 10px; font-weight: 600; margin-top: 0.4rem; }
.paywall .cta:hover { opacity: 0.92; }
.paywall.centered { text-align: center; }
.paywall.centered ul.paywall-outline { display: inline-block; text-align: left; list-style: none; padding-left: 0; }
.paywall.centered ul.paywall-outline li:before { content: "✓ "; color: var(--accent); font-weight: 700; }

.lock-tag {
  display: inline-block; font-size: 0.66rem; font-weight: 700; letter-spacing: 0.04em;
  color: var(--accent); background: var(--accent-soft); border-radius: 5px;
  padding: 0.08em 0.4em; margin-left: 0.35rem; vertical-align: middle;
}
.pill-list a.locked { opacity: 0.9; display: inline-flex; align-items: center; }