/* ============================================================
   site.css — shared site chrome (header/footer/nav) + shared helpers
   Loaded on ALL pages. Requires: tokens.css + base.css loaded first.
   ============================================================ */

/* ── SKIP LINK ───────────────────────────────────────────── */
.skip-link {
  position: absolute;
  left: var(--sp-2);
  top: calc(-1 * var(--sp-20));
  z-index: 100;
  background: var(--c-primary);
  color: var(--c-text-inv);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-md);
  font-weight: var(--fw-semibold);
  transition: top var(--ease-fast);
}
.skip-link:focus {
  top: var(--sp-2);
  color: var(--c-text-inv);
}

/* ============================================================
   SITE HEADER (reused site-wide)
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
}
.site-header__inner {
  position: relative;        /* anchor for the mobile nav panel */
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
  padding-block: var(--sp-4);
}
.site-header__logo {
  display: inline-flex;
  flex: 0 0 auto;
}
.site-header__logo img {
  height: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-6);
  list-style: none;
  padding: 0;
  margin: 0;
}
.site-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;          /* WCAG 2.5.5 tap target */
  color: var(--c-text);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.04em;
  padding-block: var(--sp-2);
  border-bottom: 2px solid transparent;
  transition: color var(--ease-fast), border-color var(--ease-fast);
}
.site-nav__link:hover {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
}

/* ── BURGER TOGGLE (JS disclosure, driven by aria-expanded) ─ */
.nav-toggle__btn {
  display: none;             /* hidden on desktop; shown ≤768px */
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;             /* WCAG 2.5.5 tap target */
  padding: 0;
  border: 0;
  border-radius: var(--r-md);
  background: transparent;
  color: var(--c-text);
  cursor: pointer;
}
.nav-toggle__btn:hover { color: var(--c-primary); }
/* burger → X when open */
.nav-toggle__bar {
  transition: transform var(--ease-fast), opacity var(--ease-fast);
  transform-origin: center;
}
.nav-toggle__btn[aria-expanded="true"] .nav-toggle__bar--top { transform: translateY(6px) rotate(45deg); }
.nav-toggle__btn[aria-expanded="true"] .nav-toggle__bar--mid { opacity: 0; }
.nav-toggle__btn[aria-expanded="true"] .nav-toggle__bar--bot { transform: translateY(-6px) rotate(-45deg); }

/* ── DESKTOP (≥769px): links always inline, no burger ─────── */
@media (min-width: 769px) {
  .nav-toggle__btn { display: none !important; }
  /* nav links always visible inline regardless of aria-expanded */
  .site-nav__list {
    display: flex;
    flex-wrap: nowrap;
    white-space: nowrap;
  }
}

/* ── MOBILE (≤768px): compact header + burger panel ──────── */
@media (max-width: 768px) {
  .site-header__inner {
    padding-block: var(--sp-2);
    gap: var(--sp-4);
  }
  .site-header__logo img {
    width: 120px;
  }
  .nav-toggle__btn { display: inline-flex; }

  /* nav hidden until the burger button reports expanded */
  .site-nav { display: none; }
  .nav-toggle__btn[aria-expanded="true"] + .site-nav {
    display: block;
    position: absolute;
    right: 0;
    top: calc(100% + var(--sp-2));
    min-width: 200px;
    z-index: 60;
  }
  .nav-toggle__btn[aria-expanded="true"] + .site-nav .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--sp-2);
    background: var(--c-bg);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-lg);
  }
  .nav-toggle__btn[aria-expanded="true"] + .site-nav .site-nav__link {
    width: 100%;
    min-height: 44px;
    padding-inline: var(--sp-3);
    border-bottom: none;
    border-radius: var(--r-md);
  }
  .nav-toggle__btn[aria-expanded="true"] + .site-nav .site-nav__link:hover {
    background: var(--c-surface-blue);
    color: var(--c-primary);
  }
}

/* ============================================================
   SHARED SECTION HELPERS
   ============================================================ */
.section-head {
  max-width: var(--max-width-narrow);
  margin-inline: auto;
  margin-bottom: var(--sp-12);
  padding-inline: var(--gutter);
  text-align: center;
}
.section-head__sub {
  margin-top: var(--sp-4);
  font-size: var(--text-lg);
  color: var(--c-text-2);
  line-height: var(--lh-relaxed);
}
.section-cta {
  margin-top: var(--sp-10);
}

/* ============================================================
   SITE FOOTER (reused site-wide)
   ============================================================ */
.site-footer {
  background: var(--c-text);
  color: var(--c-text-inv);
  padding-block: var(--sp-16);
}
.site-footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-8);
  text-align: center;
}
.site-footer__menu {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--sp-6);
  list-style: none;
  padding: 0;
}
.site-footer__menu a,
.site-footer__legal a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;          /* WCAG 2.5.5 tap target */
  padding-inline: var(--sp-2);
  color: var(--c-text-inv);
  font-weight: var(--fw-medium);
  transition: color var(--ease-fast);
}
.site-footer__menu a:hover,
.site-footer__legal a:hover {
  color: var(--c-accent);
}
.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--sp-2) var(--sp-6);
  font-size: var(--text-sm);
  opacity: 0.85;
}
.site-footer__company {
  font-size: var(--text-sm);
  color: var(--c-text-inv);
  opacity: 0.7;
  line-height: var(--lh-relaxed);
}
.site-footer__email {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--sp-12);
  height: var(--sp-12);
  border-radius: var(--r-full);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--c-text-inv);
  transition: background var(--ease-fast), border-color var(--ease-fast);
}
.site-footer__email:hover {
  color: var(--c-text-inv);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}