/* Landing-family shell: docs, research notes, legal, 404, brand.
   One-ink system: every text level is the theme's ink (--on-rgb from
   css/index.css) at a fixed alpha. Hierarchy is opacity, not palette.
   Headlines are weight 500, tracking -0.02em. Flat: hairline borders only,
   no shadows. Loads AFTER css/index.css (tokens live there). */

/* index.css pins html/body to height:100% + overflow:hidden for the app
   shell; landing pages are normal documents and must scroll. The
   [data-page="landing"] form applies from the pre-paint head script, before
   :has() resolves, so there is no clipped first frame. */
html[data-page="landing"],
html:has(body.landing-page),
body.landing-page {
  min-height: 100dvh;
  /* !important: a clipped, unscrollable page is catastrophic and this rule
     has exactly one job - never let an app-shell overflow rule pin it again. */
  height: auto !important;
  overflow-x: hidden !important;
  overflow-y: auto !important;
}

.landing-page {
  --ink-80: rgba(var(--on-rgb), 0.8);
  --ink-70: rgba(var(--on-rgb), 0.7);
  --ink-50: rgba(var(--on-rgb), 0.5);
  --ink-40: rgba(var(--on-rgb), 0.4);
  --ink-30: rgba(var(--on-rgb), 0.3);
  --hairline: rgba(var(--on-rgb), 0.06);
  --hairline-hover: rgba(var(--on-rgb), 0.16);
  --landing-maxw: 1080px;

  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg-app);
  color: var(--text);
  font-family: var(--font-main);
  -webkit-font-smoothing: antialiased;
}

/* A few % of dark ink over near-white reads far fainter than the same alpha
   of white over near-black (same asymmetry index.css documents for
   --hover-fill), so the light theme runs a hotter ramp. */
html[data-theme="light"] .landing-page {
  --ink-80: rgba(var(--on-rgb), 0.85);
  --ink-70: rgba(var(--on-rgb), 0.75);
  --ink-50: rgba(var(--on-rgb), 0.62);
  --ink-40: rgba(var(--on-rgb), 0.55);
  --ink-30: rgba(var(--on-rgb), 0.45);
  --hairline: rgba(var(--on-rgb), 0.1);
  --hairline-hover: rgba(var(--on-rgb), 0.22);
}

.landing-wrap {
  width: 100%;
  max-width: var(--landing-maxw);
  margin: 0 auto;
  padding: 0 24px;
  box-sizing: border-box;
}

/* ── Nav: 64px, blurred ground, hairline underline ───────────────────────── */
.landing-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg-app) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease-out);
}
.landing-nav.is-scrolled,
.landing-nav.scrolled {
  border-bottom-color: var(--hairline);
}
.landing-nav-inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.landing-brand { display: inline-flex; align-items: center; color: var(--text); }
.landing-brand .brand-logo { height: 22px; width: auto; display: block; }
.landing-nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}
.landing-nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-50);
  padding: 8px 12px;
  border-radius: 8px;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
.landing-nav-links a:hover { color: var(--text); }
.landing-nav-actions { display: flex; align-items: center; gap: 12px; }
.landing-nav-signin {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-50);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
.landing-nav-signin:hover { color: var(--text); }
/* Primary CTA: inverted ink pill - the strongest element on the page. */
.landing-nav-actions .btn.btn-primary {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 18px;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent, #0A0A0C);
  text-decoration: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.landing-nav-actions .btn.btn-primary:hover { opacity: 0.85; }

/* ── Prose pages: docs, legal, research ──────────────────────────────────── */
#main { flex: 1; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.landing-prose-header {
  border-bottom: 1px solid var(--hairline);
  padding: 64px 0 36px;
}
.landing-prose-header h1 {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  color: var(--text);
  text-wrap: balance;
}
.landing-prose-header p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-50);
  max-width: 40em;
}
.landing-prose-updated {
  font-family: var(--font-mono, monospace);
  font-size: 12px !important;
  color: var(--ink-30) !important;
}

.landing-prose {
  padding: 40px 24px 80px;
  max-width: 720px;
}
.landing-prose p,
.landing-prose li {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-70);
}
.landing-prose p { margin: 0 0 16px; }
.landing-prose h2 {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 38px 0 10px;
}
.landing-prose h3 {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-80);
  margin: 26px 0 8px;
}
.landing-prose ul,
.landing-prose ol { margin: 0 0 16px; padding-left: 22px; }
.landing-prose li { margin-bottom: 6px; }
.landing-prose a {
  color: var(--text);
  text-decoration: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.landing-prose a:hover { opacity: 0.75; }
.landing-prose strong { color: var(--text); font-weight: 500; }
.landing-prose code {
  font-family: var(--font-mono, monospace);
  font-size: 0.88em;
  border: 1px solid var(--hairline);
  border-radius: 5px;
  padding: 1px 5px;
  background: rgba(var(--on-rgb), 0.03);
}
.landing-prose pre {
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  background: rgba(var(--on-rgb), 0.02);
  margin: 0 0 16px;
}
.landing-prose pre code { border: none; padding: 0; background: transparent; font-size: 12.5px; line-height: 1.7; }
.landing-prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin: 0 0 16px;
  font-variant-numeric: tabular-nums;
}
.landing-prose th {
  text-align: left;
  font-weight: 500;
  color: var(--ink-40);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--hairline-hover);
}
.landing-prose td {
  padding: 9px 12px 9px 0;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink-70);
}
.landing-prose blockquote {
  margin: 0 0 16px;
  padding: 2px 0 2px 18px;
  border-left: 2px solid var(--hairline-hover);
  color: var(--ink-50);
}
.landing-prose hr {
  border: none;
  border-top: 1px solid var(--hairline);
  margin: 32px 0;
}

/* ── 404 ─────────────────────────────────────────────────────────────────── */
.landing-404 {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 96px 0;
}
.landing-404-code {
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-30);
  margin-bottom: 14px;
}
.landing-404 h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 500;
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
  color: var(--text);
}
.landing-404 p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-50);
  max-width: 34em;
  margin: 0 0 26px;
}
.landing-hero-actions { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.landing-hero-actions .btn.btn-primary {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 22px;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent, #0A0A0C);
  text-decoration: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.landing-hero-actions .btn.btn-primary:hover { opacity: 0.85; }
.landing-hero-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-50);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
.landing-hero-link:hover { color: var(--text); }
/* Legacy hero eyebrow hooks kept for any page still using them. */
.landing-hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.landing-hero-eyebrow-dot { display: none; }

/* ── Footer: flat link wall, quiet ───────────────────────────────────────── */
.landing-footer {
  border-top: 1px solid var(--hairline);
  padding: 40px 0 32px;
  margin-top: 48px;
}
.landing-footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.landing-footer-brand .brand-logo { height: 20px; width: auto; color: var(--ink-70); }
.landing-footer-tagline {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-40);
  max-width: 26em;
}
.landing-footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.landing-footer-links a {
  font-size: 13px;
  color: var(--ink-50);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
.landing-footer-links a:hover { color: var(--text); }
.landing-footer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 18px;
  border-top: 1px solid var(--hairline);
  font-size: 12.5px;
  color: var(--ink-30);
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 720px) {
  .landing-nav-links { gap: 0; }
  .landing-nav-links a { padding: 8px 8px; font-size: 13px; }
  .landing-nav-signin { display: none; }
  .landing-prose-header { padding: 44px 0 28px; }
  .landing-prose { padding: 28px 24px 56px; }
  .landing-404 { padding: 64px 0; }
}

@media (prefers-reduced-motion: reduce) {
  .landing-page * { transition-duration: 0.01ms !important; }
}

/* ── Docs quickstart: numbered steps as spaced mono digits ───────────────── */
.docs-steps {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
  display: grid;
  gap: 18px;
}
.docs-steps li { position: relative; padding-left: 0; margin: 0; }
.docs-step-num {
  display: block;
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-30);
  margin-bottom: 4px;
}

/* Same counter to index.css's global `a:hover` underline: landing links
   signal hover with ink/opacity, never decoration. */
.landing-page a:hover {
  text-decoration: none;
}