/*
 * BrainX brand footer — canonical CSS.
 * Statement-led layout (C-4). Spec: docs/superpowers/specs/2026-05-23-footer-redesign-design.md
 *
 * All selectors namespaced under .bx-footer so this file drops into both the
 * Astro landing and any Sphinx docs theme without colliding.
 *
 * Light-only by design (site-wide `color-scheme: light` in global.css).
 * No JS — Footer.astro / brainx_sphinx_header SSR the {{YEAR}} substitution.
 */

.bx-footer {
  /* Locally derived defaults so the footer renders even outside the Neural
     Atlas token cascade (e.g., embedded in a Sphinx page that imports the
     footer CSS before any site tokens). All values mirror tokens.css. */
  --bxf-paper:        var(--bx-paper, #fbf6e9);
  --bxf-paper-deep:   var(--bx-paper-deep, #f6efde);
  --bxf-paper-soft:   var(--bx-paper-soft, #f1ddd2);
  --bxf-ink:          var(--bx-ink, #1c1610);
  --bxf-ink-soft:     var(--bx-ink-soft, #3a2e1f);
  --bxf-bronze:       var(--bx-bronze, #5a4a2a);
  --bxf-coral:        var(--bx-coral, #bd5430);
  --bxf-rule:         var(--bx-rule, #d8cfb8);
  --bxf-rule-strong:  var(--bx-rule-strong, #b9ad8e);
  --bxf-font-display: var(--bx-font-display, 'Source Serif 4', Georgia, serif);
  --bxf-font-body:    var(--bx-font-body, 'Inter', system-ui, sans-serif);
  --bxf-font-mono:    var(--bx-font-mono, 'JetBrains Mono', ui-monospace, monospace);

  position: relative;
  overflow: hidden;
  margin-top: 6rem;
  background: var(--bxf-paper-deep);
  color: var(--bxf-ink-soft);
  font-family: var(--bxf-font-body);
  font-size: 0.875rem;

  /* container queries — let the footer adapt to its host's inline size, not
     the viewport. matters inside Sphinx docs where the content column is
     narrower than the viewport. */
  container-type: inline-size;
}

/* Decorative bloom: warm radial wash anchored top-right, signals "designed
   surface" without competing with the statement. */
.bx-footer::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -180px;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, var(--bxf-paper-soft) 0%, transparent 70%);
  opacity: 0.7;
  pointer-events: none;
}

.bx-footer-inner {
  position: relative;
  max-width: 80rem;
  margin: 0 auto;
  padding: 4rem 1.5rem 2.5rem;
}

/* ---------- 5-column grid ---------- */

.bx-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 2.5rem;
}

.bx-footer-col {
  min-width: 0;
}

/* ---------- Brand column ---------- */

.bx-footer-brand-wordmark {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.bx-footer-brand-mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  overflow: hidden;
}

.bx-footer-brand-mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.bx-footer-brand-name {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  line-height: 1;
  white-space: nowrap;
}

.bx-footer-brand-strong {
  font-family: var(--bxf-font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--bxf-ink);
}

.bx-footer-brand-sub {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bxf-bronze);
}

.bx-footer-brand-affil {
  max-width: 22rem;
  margin: 0 0 1rem;
}

.bx-footer-brand-affil p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--bxf-bronze);
}

.bx-footer-brand-affil p em {
  font-style: italic;
  color: var(--bxf-ink-soft);
}

.bx-footer-brand-affil p strong {
  font-weight: 600;
  color: var(--bxf-ink);
}

.bx-footer-brand-social {
  display: flex;
  gap: 0.5rem;
}

.bx-footer-brand-social a {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--bxf-rule);
  border-radius: 6px;
  color: var(--bxf-ink-soft);
  text-decoration: none;
  transition: color 150ms ease, border-color 150ms ease, background-color 150ms ease;
}

.bx-footer-brand-social a:hover,
.bx-footer-brand-social a:focus-visible {
  color: var(--bxf-coral);
  border-color: var(--bxf-coral);
  background-color: var(--bxf-paper-soft);
}

/* ---------- Link columns ---------- */

.bx-footer-col-heading {
  margin: 0 0 1rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bxf-ink);
}

.bx-footer-col-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.bx-footer-col-list a {
  color: var(--bxf-ink-soft);
  text-decoration: none;
  transition: color 150ms ease;
}

.bx-footer-col-list a:hover,
.bx-footer-col-list a:focus-visible {
  color: var(--bxf-coral);
}

.bx-footer-col-more a {
  color: var(--bxf-bronze);
  font-size: 0.83rem;
}

.bx-footer-col-more a:hover,
.bx-footer-col-more a:focus-visible {
  color: var(--bxf-coral);
}

/* ---------- Bottom strip ---------- */

.bx-footer-bottom {
  position: relative;
}

.bx-footer-bottom-inner {
  max-width: 80rem;
  margin: 0 auto;
  padding: 1.75rem 1.5rem 2.5rem;
  border-top: 1px solid var(--bxf-rule-strong);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--bxf-bronze);
}

.bx-footer-bottom-left,
.bx-footer-bottom-right {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.bx-footer-bottom-right {
  gap: 0.5rem;
}

.bx-footer-dot {
  opacity: 0.45;
  margin: 0 0.4rem;
}

.bx-footer-cite-link {
  color: var(--bxf-ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--bxf-rule-strong);
  padding-bottom: 1px;
  transition: color 150ms ease, border-color 150ms ease;
}

.bx-footer-cite-link:hover,
.bx-footer-cite-link:focus-visible {
  color: var(--bxf-coral);
  border-color: var(--bxf-coral);
}

.bx-footer-badge {
  padding: 3px 9px;
  border: 1px solid var(--bxf-rule-strong);
  border-radius: 999px;
  font-family: var(--bxf-font-mono);
  font-size: 0.7rem;
  color: var(--bxf-ink-soft);
}

/* ---------- Responsive (container queries) ---------- */

@container (max-width: 960px) {
  .bx-footer-inner {
    padding: 3rem 1.5rem 2rem;
  }
  .bx-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem 2.5rem;
  }
  .bx-footer-brand {
    grid-column: 1 / -1;
    max-width: 32rem;
  }
}

@container (max-width: 640px) {
  .bx-footer-inner {
    padding: 2.5rem 1.25rem 1.5rem;
  }
  .bx-footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  .bx-footer-brand {
    max-width: 100%;
  }
  .bx-footer-col-heading {
    margin-bottom: 0.75rem;
  }
  .bx-footer-col-list {
    gap: 0.45rem;
  }
  .bx-footer-bottom-inner {
    padding: 1.25rem 1.25rem 2rem;
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  .bx-footer-brand-social a,
  .bx-footer-col-list a,
  .bx-footer-col-more a,
  .bx-footer-cite-link {
    transition: none;
  }
}


/* --- brainx-sphinx-header docs-site footer overrides ---
   The shared footer.css ships with `margin-top: 6rem` so the brand footer
   separates cleanly from the editorial content on the Astro landing page.
   Inside a Sphinx page the theme renders its own footer (bd-footer-content
   with copyright / last-updated) directly above ours, and that top margin
   then shows up as a ~6-8rem blank band between the two footers. Zero it
   so the BrainX footer sits flush against the theme footer; its own
   internal padding and distinct background still mark a clear band. */
.bx-footer {
  margin-top: 0 !important;
}