/* Shared styles for /guides. Tokens match index.html so guides feel like the same site. */
:root {
  color-scheme: light;
  --canvas: #f8f9ff;
  --surface-low: #eff4ff;
  --surface-high: #d3e4fe;
  --surface-card: #ffffff;
  --primary: #567899;
  --primary-deep: #3d5f7f;
  --teal: #4db6ac;
  --teal-ink: #1f6e66;
  --ink: #0b1c30;
  --ink-muted: rgba(11, 28, 48, 0.66);
  --line: rgba(11, 28, 48, 0.1);
  --radius-xl: 1.5rem;
  --radius-md: 1rem;
  --pill: 999px;
  --shadow-ambient: 0 24px 40px rgba(11, 28, 48, 0.06);
  --font-display: "Manrope", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Plus Jakarta Sans", ui-sans-serif, system-ui, sans-serif;
  --grid-max: 1200px;
  --read-max: 44rem;
  --nav-height: 4.25rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-height) + 1rem); }
html, body { overflow-x: clip; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--canvas);
  color: var(--ink);
  line-height: 1.7;
  font-size: 1.0625rem;
}

h1, h2, h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary-deep); text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; }

.shell {
  max-width: var(--grid-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 3rem);
}

.skip-link {
  position: absolute; left: -999px; top: 0.5rem;
  background: var(--surface-card); color: var(--ink);
  padding: 0.6rem 1rem; border-radius: var(--pill); z-index: 99;
}
.skip-link:focus { left: 0.5rem; }

/* ---------- Nav (same as homepage) ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(248, 249, 255, 0.85);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
}
.nav-inner {
  display: flex; align-items: center; gap: 1.5rem;
  padding-block: 0.7rem; min-height: var(--nav-height);
}
.nav-logo {
  display: flex; align-items: center; gap: 0.6rem;
  margin-right: auto; text-decoration: none; color: var(--ink);
}
.nav-logo img { width: 36px; height: 36px; object-fit: contain; }
.nav-logo span { font-family: var(--font-display); font-weight: 800; font-size: 1.15rem; }
.nav a.nav-link { color: var(--ink-muted); text-decoration: none; font-weight: 500; font-size: 0.95rem; }
.nav a.nav-link:hover { color: var(--ink); }
.chip-app {
  text-decoration: none; background: rgba(77, 182, 172, 0.14); color: var(--teal-ink);
  font-weight: 600; font-size: 0.85rem; padding: 0.45rem 0.95rem;
  border-radius: var(--pill); white-space: nowrap;
}

/* ---------- Article ---------- */
.article { padding-block: clamp(2rem, 6vw, 4rem) clamp(3rem, 8vw, 5rem); }
.article-inner { max-width: var(--read-max); margin-inline: auto; }

.crumbs { font-size: 0.9rem; color: var(--ink-muted); margin-bottom: 1.25rem; }
.crumbs a { color: var(--ink-muted); text-decoration: none; }
.crumbs a:hover { color: var(--ink); }

.article h1 { font-size: clamp(2rem, 5vw, 2.9rem); font-weight: 800; margin-bottom: 1rem; }
.article h2 { font-size: clamp(1.4rem, 3vw, 1.75rem); font-weight: 700; margin: 2.75rem 0 0.9rem; }
.article h3 { font-size: 1.15rem; font-weight: 700; margin: 1.75rem 0 0.5rem; }
.article p, .article ul, .article ol { margin: 0 0 1.1rem; }
.article li { margin-bottom: 0.45rem; }
.article li::marker { color: var(--primary); }

.byline { font-size: 0.9rem; color: var(--ink-muted); margin-bottom: 2rem; }

.answer {
  background: var(--surface-card);
  border-left: 4px solid var(--teal);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.4rem;
  box-shadow: var(--shadow-ambient);
  margin-bottom: 2rem;
}
.answer p:last-child { margin-bottom: 0; }

.callout {
  background: var(--surface-low);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.3rem;
  margin: 1.5rem 0;
  font-size: 0.98rem;
}
.callout strong { font-family: var(--font-display); }

/* ---------- App CTA ---------- */
.cta {
  display: grid; grid-template-columns: auto 1fr; gap: 1rem 1.25rem; align-items: center;
  background: var(--surface-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 1.25rem 1.4rem;
  margin: 2.25rem 0;
  box-shadow: var(--shadow-ambient);
}
.cta img.cta-icon { width: 56px; height: 56px; border-radius: 14px; }
.cta h3 { margin: 0 0 0.25rem; font-size: 1.1rem; }
.cta p { margin: 0; color: var(--ink-muted); font-size: 0.98rem; }
.cta .cta-actions { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
.cta .cta-actions img { height: 44px; width: auto; }
.cta .cta-note { font-size: 0.85rem; color: var(--ink-muted); }

/* ---------- FAQ ---------- */
.faq details {
  border-top: 1px solid var(--line);
  padding: 0.9rem 0;
}
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer; font-family: var(--font-display); font-weight: 700; list-style: none;
  display: flex; justify-content: space-between; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--primary); font-weight: 800; }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { margin: 0.6rem 0 0; }

/* ---------- Sources, related, disclaimer ---------- */
.sources { font-size: 0.92rem; color: var(--ink-muted); }
.sources ol { padding-left: 1.2rem; }
.related ul { list-style: none; padding: 0; display: grid; gap: 0.5rem; }
.related a { font-weight: 600; }
.disclaimer {
  font-size: 0.88rem; color: var(--ink-muted);
  border-top: 1px solid var(--line); padding-top: 1.25rem; margin-top: 2.5rem;
}

/* ---------- Hub ---------- */
.hub-hero { padding-block: clamp(2.5rem, 7vw, 4.5rem) 1.5rem; }
.hub-hero h1 { font-size: clamp(2.1rem, 5vw, 3rem); font-weight: 800; margin-bottom: 0.75rem; }
.hub-hero p { color: var(--ink-muted); max-width: 40rem; margin: 0; font-size: 1.1rem; }
.hub-group { padding-block: 1.5rem; }
.hub-group h2 { font-size: 1.3rem; margin-bottom: 1rem; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr)); gap: 1rem; }
.card {
  display: block; text-decoration: none; color: var(--ink);
  background: var(--surface-card); border-radius: var(--radius-md);
  padding: 1.2rem 1.3rem; box-shadow: var(--shadow-ambient);
  border: 1px solid transparent; transition: border-color 0.2s ease;
}
.card:hover { border-color: var(--surface-high); }
.card h3 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.card p { margin: 0; font-size: 0.95rem; color: var(--ink-muted); }
.hub-empty { color: var(--ink-muted); font-size: 0.95rem; }

/* ---------- Footer ---------- */
.footer { background: var(--surface-low); padding-block: 2.25rem; }
.footer-inner {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: 0.75rem 2rem; font-size: 0.9rem; color: var(--ink-muted);
}
.footer a { color: var(--ink-muted); text-decoration: none; font-weight: 500; }
.footer a:hover { color: var(--ink); }
.footer .copyright { margin-right: auto; }

@media (max-width: 720px) {
  .nav a.nav-link { display: none; }
  .cta { grid-template-columns: 1fr; }
  .cta img.cta-icon { display: none; }
}