/**
 * site-shell.css — Phase 7 — Global header + footer styling.
 *
 * Extracted from homepage-layout.css during Task 4 founder QA after the
 * cascade regression: homepage-layout.css only loads on / via the
 * koallabs/homepage library, so on /services, /framework, /about, /contact
 * the Phase 7 refreshed .site-header / .site-footer markup fell back to
 * legacy style.css rules (tiny logo, stacked footer columns).
 *
 * This file loads on EVERY page via the koallabs/global library
 * (referenced from koallabs.info.yml libraries:), and overrides the
 * legacy style.css rules because it is listed AFTER style.css in the
 * global library entry (CSS specificity tie → source order wins).
 *
 * Scope: .site-header, .site-footer, and their descendants only.
 * Everything else from the Phase 7 homepage (heroes, sections, scrolly)
 * stays in homepage-layout.css under the front-page-scoped library.
 */

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10,10,15,0.78);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--color-border);
}
.site-header .inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 32px; max-width: 1320px; margin: 0 auto;
}
.site-header .brand { display: flex; align-items: center; gap: 12px; color: var(--color-foreground); }
.site-header .brand img { height: 48px; }
.site-header .brand .bmark { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.22em; color: var(--color-foreground-subtle); padding-left: 14px; border-left: 1px solid var(--color-border); }
.site-header nav { display: flex; gap: 28px; align-items: center; }
.site-header nav a { font-size: 14px; color: var(--color-foreground); }
.site-header nav a:hover { color: var(--color-accent); }
.site-header .cta-btn {
  background: var(--color-accent); color: #0A0A0F;
  padding: 9px 18px; border-radius: 6px; font-weight: 600; font-size: 14px;
  transition: opacity .15s ease;
}
.site-header .cta-btn:hover { opacity: 0.9; color: #0A0A0F; }

/* Hamburger toggle — hidden on desktop, shown on <900px */
.hamburger-toggle {
  display: none;
  background: transparent; border: 0; color: var(--color-foreground);
  padding: 8px; cursor: pointer;
  align-items: center; justify-content: center;
}
.hamburger-toggle:hover { color: var(--color-accent); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border); background: var(--color-card);
  padding: 64px 0 32px; margin-top: 96px;
}
.site-footer .grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 48px;
  max-width: 1320px; margin: 0 auto; padding: 0 32px;
}
.site-footer h5 { font-size: 13px; color: var(--color-foreground); font-weight: 600; margin: 0 0 16px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 10px; }
.site-footer a { color: var(--color-foreground-muted); font-size: 14px; }
.site-footer a:hover { color: var(--color-accent); }
.site-footer .about { color: var(--color-foreground-muted); font-size: 14px; line-height: 1.6; max-width: 36ch; margin-top: 12px; }
.site-footer .bottom {
  max-width: 1320px; margin: 48px auto 0; padding: 24px 32px 0;
  border-top: 1px solid var(--color-border);
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-mono); font-size: 12px; color: var(--color-foreground-subtle);
}

/* ---------- Mobile (<900px) shell adaptations ---------- */
@media (max-width: 900px) {
  .site-header .brand .bmark { display: none; }
  .site-footer .grid { grid-template-columns: 1fr 1fr; }

  /* Reveal the hamburger button */
  .hamburger-toggle { display: inline-flex; }

  /* Hide the entire nav by default; surface as a dropdown when toggled open.
     Inline JS in header.html.twig toggles both .nav-open and .is-open on click. */
  .site-header .inner { position: relative; }
  .site-header nav {
    display: none;
    position: absolute;
    top: calc(100% + 1px);      /* sit flush below the header bottom border */
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    padding: 24px 32px;
    background: rgba(10,10,15,0.96);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    backdrop-filter: blur(14px) saturate(140%);
    border-bottom: 1px solid var(--color-border);
  }
  .site-header nav.nav-open,
  .site-header nav.is-open { display: flex; }
  .site-header nav a {
    font-size: 16px;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255,255,255,0.04);
  }
  .site-header nav a:last-child { border-bottom: 0; }
  .site-header nav a.cta-btn {
    margin-top: 8px;
    text-align: center;
    border-bottom: 0;
  }
}