/* ── shared tokens (mirrors index.html) ─────────────────────── */
:root {
  --bg:        #0A0A0B;
  --bg-2:      #101012;
  --bg-3:      #16161A;
  --fg:        #F5F5F2;
  --fg-2:      #BDBDB8;
  --fg-3:      #6B6B68;
  --fg-4:      #3A3A3A;
  --line:      rgba(245,245,242,0.08);
  --line-2:    rgba(245,245,242,0.14);
  --accent:    #00E0A4;
  --accent-ink:#06231B;
  --accent-glow: rgba(0,224,164,0.35);

  --font-display: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --maxw: 760px;
  --pad: clamp(20px, 4vw, 56px);
  --radius: 14px;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-display);
  font-feature-settings: "ss01","ss02","cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: var(--accent-ink); }

/* ── nav ───────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px var(--pad);
  background: color-mix(in oklab, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 600; font-size: 15px; letter-spacing: -0.01em;
}
.brand-mark {
  width: 22px; height: 22px; border-radius: 6px;
  background: var(--accent);
  position: relative; overflow: hidden; flex: none;
}
.brand-mark::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(120% 120% at 100% 0%, transparent 30%, rgba(0,0,0,0.55) 100%);
}
.brand-mark::before {
  content: ""; position: absolute; left: 5px; top: 5px;
  width: 12px; height: 12px; border-radius: 3px;
  background: var(--accent-ink); opacity: 0.85;
  z-index: 1;
}
.nav-back {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-3);
  display: inline-flex; align-items: center; gap: 6px;
  transition: color 160ms ease;
}
.nav-back:hover { color: var(--fg); }

/* ── article frame ─────────────────────────────────────────── */
.article-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 80px var(--pad) 120px;
}
.crumb {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3); letter-spacing: 0.08em; text-transform: uppercase;
  display: inline-flex; align-items: center; gap: 8px;
  margin-bottom: 28px;
}
.crumb::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}
.article-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.04;
  margin: 0 0 24px;
  text-wrap: balance;
}
.article-deck {
  font-size: 19px;
  color: var(--fg-2);
  line-height: 1.5;
  margin: 0 0 36px;
  max-width: 60ch;
  text-wrap: pretty;
}
.article-meta {
  display: flex; gap: 18px; align-items: center; flex-wrap: wrap;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 48px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--fg-3);
  letter-spacing: 0.04em;
}
.article-meta .dot {
  width: 4px; height: 4px; border-radius: 999px; background: var(--fg-4);
}

/* ── article body ──────────────────────────────────────────── */
.prose { font-size: 17px; line-height: 1.65; color: var(--fg); }
.prose > * + * { margin-top: 24px; }
.prose h2 {
  font-size: 26px;
  font-weight: 500;
  letter-spacing: -0.018em;
  margin: 56px 0 14px;
  line-height: 1.2;
  text-wrap: balance;
}
.prose h3 {
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.012em;
  margin: 36px 0 10px;
  color: var(--fg);
}
.prose p { color: var(--fg); margin: 0; }
.prose p strong { font-weight: 500; }
.prose ul, .prose ol {
  margin: 0; padding-left: 0; list-style: none;
  display: flex; flex-direction: column; gap: 12px;
}
.prose ul li, .prose ol li {
  padding-left: 22px;
  position: relative;
  color: var(--fg);
  line-height: 1.55;
}
.prose ul li::before {
  content: "→";
  position: absolute; left: 0; top: 0;
  color: var(--accent);
  font-family: var(--font-mono);
}
.prose ol { counter-reset: ol; }
.prose ol li {
  counter-increment: ol;
  padding-left: 28px;
}
.prose ol li::before {
  content: counter(ol, decimal-leading-zero);
  position: absolute; left: 0; top: 1px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}
.prose blockquote {
  margin: 0;
  padding: 18px 22px;
  border-left: 2px solid var(--accent);
  background: var(--bg-2);
  border-radius: 0 8px 8px 0;
  color: var(--fg-2);
  font-size: 17px;
  line-height: 1.55;
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-2);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--line);
  color: var(--accent);
}
.prose pre {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--fg-2);
}
.prose pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
  font-size: inherit;
}
.prose hr {
  border: 0; border-top: 1px solid var(--line);
  margin: 48px 0;
}
.prose a {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in oklab, var(--accent) 40%, transparent);
  transition: border-color 160ms ease;
}
.prose a:hover { border-bottom-color: var(--accent); }
.callout {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px 24px;
  display: flex; flex-direction: column; gap: 8px;
}
.callout-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.callout p { color: var(--fg-2); font-size: 15.5px; line-height: 1.55; margin: 0; }

/* ── article footer / CTA ──────────────────────────────────── */
.article-foot {
  margin-top: 72px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.article-cta {
  margin-top: 28px;
  padding: 28px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex; flex-direction: column; gap: 14px;
}
.article-cta h4 {
  font-size: 20px; font-weight: 500; letter-spacing: -0.015em;
  margin: 0; text-wrap: balance;
}
.article-cta p {
  color: var(--fg-2); font-size: 14.5px; line-height: 1.55; margin: 0;
}
.btn {
  align-self: flex-start;
  display: inline-flex; align-items: center; gap: 10px;
  padding: 11px 18px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 13.5px; font-weight: 500; letter-spacing: -0.005em;
  border: 0;
  transition: box-shadow 200ms ease, transform 160ms ease;
}
.btn:hover { box-shadow: 0 0 0 8px var(--accent-glow); transform: translateY(-1px); }

/* ── guides hub ────────────────────────────────────────────── */
.hub-wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 80px var(--pad) 120px;
}
.hub-head h1 {
  font-size: clamp(40px, 5.4vw, 64px);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.02;
  margin: 18px 0 18px;
  text-wrap: balance;
}
.hub-head p {
  font-size: 18px; color: var(--fg-2); line-height: 1.5; margin: 0 0 56px;
  max-width: 56ch;
}
.hub-list {
  display: flex; flex-direction: column;
  border-top: 1px solid var(--line);
}
.hub-row {
  display: grid;
  grid-template-columns: 80px 1.2fr 1.6fr 32px;
  gap: 32px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  align-items: center;
  transition: background 240ms ease;
}
.hub-row:hover { background: color-mix(in oklab, var(--accent) 4%, transparent); }
.hub-row .src {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3); letter-spacing: 0.04em; text-transform: uppercase;
}
.hub-row h3 {
  font-size: clamp(18px, 1.8vw, 22px);
  font-weight: 500; letter-spacing: -0.015em;
  margin: 0; line-height: 1.2; text-wrap: balance;
}
.hub-row p {
  font-size: 14px; color: var(--fg-2); margin: 0; line-height: 1.5;
}
.hub-row .arr {
  font-family: var(--font-mono); color: var(--fg-3); font-size: 16px;
  text-align: right;
  transition: color 200ms ease, transform 200ms ease;
}
.hub-row:hover .arr { color: var(--accent); transform: translateX(3px); }
@media (max-width: 900px) {
  .hub-row { grid-template-columns: 64px 1fr 32px; gap: 16px; padding: 22px 0; }
  .hub-row p { grid-column: 2 / 4; }
  .hub-row .arr { grid-column: 3; grid-row: 1; align-self: start; }
}

/* ── footer ────────────────────────────────────────────────── */
.foot {
  border-top: 1px solid var(--line);
  padding: 32px var(--pad);
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--fg-3); letter-spacing: 0.04em;
  flex-wrap: wrap; gap: 12px;
}