/* ==========================================================================
   First Brick — Layout: header, footer, grids, hero scaffolding
   ========================================================================== */

/* --- Header ----------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-white) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition), background var(--transition);
}
.site-header.is-scrolled { box-shadow: var(--shadow-sm); }

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-24);
  min-height: var(--header-height);
}

/* Logo */
.logo { display: inline-flex; align-items: center; gap: var(--space-12); }
.logo__wordmark { display: flex; flex-direction: column; line-height: 1; }
.logo__name {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 1.15rem;
  color: var(--color-ink-navy);
  letter-spacing: -0.01em;
}
.logo__tagline {
  font-size: 0.625rem;
  font-weight: var(--weight-semibold);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-top: 3px;
}
.logo--footer .logo__name { color: var(--color-white); }
.logo--footer .logo__tagline { color: rgba(255, 255, 255, 0.65); }

/* Desktop nav — pushed to the right, sitting next to the CTA */
.nav--desktop { margin-left: auto; }
.nav--desktop .nav__list {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-16), 1.5vw, var(--space-32));
}
.nav__link {
  font-size: var(--fs-nav);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  padding: var(--space-8) 2px;
  position: relative;
  transition: color var(--transition-fast);
}
.nav__link:hover { color: var(--color-ink-navy); }
.nav__link.is-active { color: var(--color-ink-navy); font-weight: var(--weight-semibold); }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 2px; right: 2px; bottom: 0;
  height: 2px;
  background: var(--color-signal-amber);
  border-radius: 2px;
}

.site-header__actions { display: flex; align-items: center; gap: var(--space-16); }

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  border-radius: var(--radius-button);
  color: var(--color-ink-navy);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.nav-toggle:hover { background: var(--color-cloud); border-color: var(--color-border-strong); }
.nav-toggle--close { border: none; background: transparent; }

/* Mobile menu overlay */
/* Full-screen white overlay menu (per Figma "Nav / Mobile Menu — Overlay") */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--color-white);
  display: flex;
  flex-direction: column;
  opacity: 0;
  transition: opacity var(--transition);
}
.mobile-menu[hidden] { display: none; }
.mobile-menu.is-open { opacity: 1; }
.mobile-menu__panel {
  width: 100%;
  height: 100%;
  padding: 0 var(--container-pad) var(--space-32);
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  overflow-y: auto;
}
/* Match the site header's height + centring so the logo and close button
   sit in exactly the same spot as the closed-state logo and menu toggle. */
.mobile-menu__top { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-height); margin-bottom: var(--space-8); }
.mobile-menu__list { display: flex; flex-direction: column; }
.mobile-menu__link {
  display: block;
  font-family: var(--font-display);
  font-size: 1.375rem;                 /* 22px, per Figma */
  font-weight: var(--weight-medium);
  color: var(--color-ink-navy);
  padding: var(--space-12) 0;
  border-bottom: 1px solid var(--color-border);
}
.mobile-menu__link.is-active { color: var(--color-foundation-blue); }
.mobile-menu__actions { display: flex; flex-direction: column; gap: var(--space-12); margin-top: var(--space-24); }

/* --- Grids ------------------------------------------------------------ */
.grid { display: grid; gap: var(--space-24); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); }

/* Two-column content/media split */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-32), 4vw, var(--space-80));
  align-items: center;
}
.split--media-first > :first-child { order: 1; }

/* --- Footer ----------------------------------------------------------- */
.site-footer {
  background: var(--color-ink-navy);
  color: rgba(255, 255, 255, 0.72);
  padding-block: clamp(3rem, 2rem + 4vw, 5rem) var(--space-32);
}
.site-footer__inner {
  display: grid;
  grid-template-columns: 1.4fr 2fr;
  gap: clamp(var(--space-32), 4vw, var(--space-80));
}
.site-footer__brand { max-width: 34ch; }
.site-footer__blurb { margin-top: var(--space-16); color: rgba(255, 255, 255, 0.72); }
.site-footer__social { display: flex; gap: var(--space-20); margin-top: var(--space-20); }
.site-footer__social a { color: rgba(255, 255, 255, 0.8); }
.site-footer__social a:hover { color: var(--color-white); }

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-32);
}
.footer-group__title {
  font-family: var(--font-body);
  font-size: var(--fs-eyebrow);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: var(--space-16);
}
.footer-group ul { display: flex; flex-direction: column; gap: var(--space-12); }
.footer-group a { color: rgba(255, 255, 255, 0.82); font-size: var(--fs-body-sm); }
.footer-group a:hover { color: var(--color-white); }

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-12);
  margin-top: clamp(2.5rem, 4vw, 4rem);
  padding-top: var(--space-24);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  font-size: var(--fs-body-sm);
  color: rgba(255, 255, 255, 0.6);
}