/* ============================================================================
   Axoview — shared design system for the static pages
   (landing.html, privacy.html, terms.html, 404.html).

   Single source of truth so the pages CANNOT drift apart visually. Loaded via
   <link rel="stylesheet" href="/site.css">; permitted by the CSP style-src
   'self'. Page-specific rules (the landing hero/cards, etc.) stay inline in
   each page's own <style>.
   ========================================================================== */

:root {
  --ink: #0f172a;      /* headings */
  --body: #334155;     /* body copy */
  --muted: #64748b;    /* secondary text / nav links */
  --accent: #2563eb;
  --accent-deep: #1d4ed8;
  --sky: #0ea5e9;
  --line: #e5e7eb;
  --panel: #f8fafc;
  --bg: #ffffff;
}

* { margin: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--body);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---- Buttons -------------------------------------------------------------- */
.btn {
  display: inline-block; font-weight: 600; border-radius: 10px;
  padding: 11px 22px; font-size: 15px; line-height: 1.2;
  transition: all 120ms ease; border: 1px solid transparent; cursor: pointer;
}
/* White text must always win, even for a button placed inside .nav-links
   (whose bare `a` rule would otherwise grey the label). */
.btn-primary,
.nav-links a.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover,
.nav-links a.btn-primary:hover { background: var(--accent-deep); text-decoration: none; color: #fff; }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { background: var(--panel); text-decoration: none; color: var(--ink); }

/* ---- Header --------------------------------------------------------------- */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 12px 16px; padding: 18px 24px;
}
a.brand {
  font-size: 24px; font-weight: 700; color: var(--ink);
  letter-spacing: -0.01em; text-decoration: none;
}
a.brand:hover { text-decoration: none; }
a.brand .accent { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 15px; }
/* Only plain text links are muted — never the button (see .btn-primary above). */
.nav-links a:not(.btn) { color: var(--muted); }
.nav-links a:not(.btn):hover { color: var(--ink); text-decoration: none; }

/* ---- Footer --------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--line); margin-top: 8px; }
.site-footer .wrap {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 16px; padding: 40px 24px; font-size: 14px; color: var(--muted);
}
.site-footer .foot-links { display: flex; gap: 20px; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--ink); }

/* ---- Prose (legal / long-form pages) ------------------------------------- */
.prose { max-width: 780px; margin: 0 auto; padding: 56px 24px 88px; }

/* Context-aware back link at the top of the legal pages. Its destination +
   label are set by /legal-nav.js from the referrer (editor / landing / home);
   the markup default (href="/", "Back") is the no-JS fallback. */
.back-link {
  display: inline-flex; align-items: center; gap: 7px;
  color: var(--muted); font-size: 14px; font-weight: 600;
  margin-bottom: 24px;
}
.back-link:hover { color: var(--accent); text-decoration: none; }
.back-link .arrow { font-size: 17px; line-height: 1; }
.prose h1 {
  font-size: clamp(30px, 4vw, 38px); line-height: 1.2; letter-spacing: -0.01em;
  color: var(--ink); margin-bottom: 6px;
}
.prose .meta { color: var(--muted); font-size: 14px; margin-bottom: 32px; }
.prose h2 { font-size: 21px; color: var(--ink); margin: 40px 0 12px; padding-top: 4px; }
.prose h3 { font-size: 16px; color: var(--ink); margin: 24px 0 8px; }
.prose p, .prose li { color: var(--body); font-size: 16px; line-height: 1.7; }
.prose strong { color: var(--ink); }
.prose ul { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose a { color: var(--accent); }
.prose a:hover { text-decoration: underline; }
.prose .tldr {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 20px 24px; margin: 8px 0;
}
.prose .tldr h2 { margin-top: 0; }
.prose .tldr ul { margin-bottom: 0; }
.prose .callout { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 4px 24px; margin: 8px 0; }
.prose strong.caps { text-transform: uppercase; letter-spacing: 0.02em; font-size: 0.9em; }
.prose code {
  background: var(--panel); border: 1px solid var(--line); border-radius: 5px;
  padding: 1px 6px; font-size: 0.9em;
  font-family: 'SFMono-Regular', ui-monospace, Menlo, Consolas, monospace;
}
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }
.prose .foot { color: var(--muted); font-size: 14px; }

/* ---- Responsive ----------------------------------------------------------- */
@media (max-width: 560px) {
  /* No hamburger — collapse the secondary nav rather than script a menu (the
     landing/404 carry no JS; the legal pages carry only the tiny back-link
     helper). GitHub stays reachable from the footer; on the landing, Features
     is a scroll away. */
  .nav-links a.nav-secondary { display: none; }
}