/* ==========================================================================
   Silver Glass — shared layout: header/nav, footer, breadcrumbs, container.
   ========================================================================== */

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 20px;
}

.container.narrow {
  max-width: 880px;
}

main {
  display: block;
  padding-block: 2.2rem 1rem;
}

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--glass-strong);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--hairline);
}

.nav {
  position: relative;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 20px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--ink-900);
  letter-spacing: .01em;
}

.nav__brand:hover {
  text-decoration: none;
}

.nav__brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(150deg, var(--silver-400), var(--accent));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .45), var(--shadow-sm);
}

/* ---- Nav links ---- */
.nav__links {
  display: flex;
  align-items: center;
  gap: .25rem;
  margin-left: .5rem;
  flex: 1 1 auto;
}

.nav__spacer {
  flex: 1 1 auto;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .45rem .8rem;
  border-radius: 999px;
  color: var(--ink-500);
  font-weight: 500;
  font-size: .95rem;
  border: 1px solid transparent;
  transition: color .15s ease, background-color .15s ease, border-color .15s ease;
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--ink-900);
  background: var(--glass-faint);
  text-decoration: none;
}

.nav__link.is-active {
  color: var(--accent-strong);
  background: var(--accent-soft);
  border-color: var(--hairline);
}

.nav__cta {
  color: var(--white);
  background: linear-gradient(150deg, var(--accent), var(--accent-strong));
  border-color: transparent;
}

.nav__cta:hover {
  color: var(--white);
  background: linear-gradient(150deg, var(--accent-strong), var(--accent-strong));
  box-shadow: var(--shadow-sm);
}

.nav__cta.is-active {
  color: var(--white);
}

/* ---- Optional dropdown (portable; opens on hover / focus-within) ---- */
.nav__dd {
  position: relative;
}

.nav__dd__menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 190px;
  display: none;
  flex-direction: column;
  gap: .1rem;
  padding: .35rem;
  /* Content-covering overlay: opaque, no blur (see DESIGN.md §3). */
  background: var(--surface-solid);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  z-index: 45;
}

.nav__dd:hover .nav__dd__menu,
.nav__dd:focus-within .nav__dd__menu {
  display: flex;
}

/* ---- Mobile menu toggle ---- */
.nav__toggle {
  display: none;
  margin-left: auto;
  width: 42px;
  height: 42px;
  padding: 0;
  align-items: center;
  justify-content: center;
  background: var(--glass-faint);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  color: var(--ink-900);
  cursor: pointer;
}

.nav__toggle:hover {
  background: var(--glass);
}

.nav__toggle svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 900px) {
  .nav__toggle {
    display: inline-flex;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    margin: 0;
    flex-direction: column;
    align-items: stretch;
    gap: .1rem;
    padding: .6rem;
    /* Content-covering overlay: opaque, no blur (see DESIGN.md §3). */
    background: var(--surface-solid);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    border-bottom: 1px solid var(--hairline);
    box-shadow: var(--shadow-md);
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__spacer {
    display: none;
  }

  .nav__link {
    justify-content: flex-start;
  }

  .nav__dd__menu {
    position: static;
    display: flex;
    padding: 0 0 0 .8rem;
    border: 0;
    box-shadow: none;
    background: transparent;
    min-width: 0;
  }
}

/* ---- Breadcrumbs ---- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  font-size: .9rem;
  color: var(--ink-400);
  margin-bottom: 1.2rem;
}

.breadcrumbs a {
  color: var(--ink-500);
}

.breadcrumbs .sep {
  color: var(--silver-500);
}

/* ---- Footer ---- */
.site-footer {
  margin-top: 4rem;
  border-top: 1px solid var(--hairline);
  background: var(--glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  padding-block: 2.4rem;
}

.site-footer__brand {
  flex: 1 1 260px;
  min-width: 220px;
}

.site-footer__title {
  font-weight: 700;
  color: var(--ink-900);
  font-size: 1.05rem;
  margin-bottom: .35rem;
}

.site-footer__tag {
  color: var(--ink-500);
  font-size: .93rem;
  margin: 0;
  max-width: 40ch;
}

.site-footer__col {
  display: flex;
  flex-direction: column;
  gap: .45rem;
}

.site-footer__col a {
  color: var(--ink-500);
  font-size: .93rem;
}

.site-footer__col a:hover {
  color: var(--accent-strong);
}

.site-footer__heading {
  font-size: .76rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--ink-400);
  margin-bottom: .25rem;
}

.site-footer__bottom {
  flex-basis: 100%;
  border-top: 1px solid var(--hairline);
  padding-top: 1.1rem;
  color: var(--ink-400);
  font-size: .9rem;
}