.app-shell {
  display: grid;
  min-height: 100vh;
  grid-template-rows: auto auto auto 1fr auto;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem max(1rem, calc((100% - var(--content-width)) / 2));
  border-bottom: 1px solid rgba(245, 199, 111, 0.28);
  background: rgba(4, 11, 18, 0.94);
  color: var(--cream-100);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  min-height: var(--touch-size);
  align-items: center;
  gap: 0.75rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
}

.brand-mark {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  flex: 0 0 2.5rem;
  place-items: center;
  border: 1px solid var(--gold-500);
  border-radius: 50%;
  color: var(--gold-300);
  font-family: var(--font-title);
  font-size: 1.2rem;
  overflow: hidden;
  box-shadow: 0 0 22px rgba(245, 199, 111, 0.2);
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-copy {
  display: grid;
  line-height: 1.15;
}

.brand-copy strong {
  color: var(--cream-100);
  font-family: var(--font-title);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.brand-copy small {
  display: none;
  color: #d8cfbf;
  font-size: 0.72rem;
}

.nav-toggle {
  min-height: var(--touch-size);
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--navy-600);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--cream-100);
}

.primary-navigation {
  position: absolute;
  top: calc(100% + 1px);
  right: 0.75rem;
  display: none;
  width: min(19rem, calc(100vw - 1.5rem));
  padding: 0.5rem;
  border: 1px solid var(--navy-700);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: var(--navy-900);
  box-shadow: var(--shadow);
}

.primary-navigation.is-open {
  display: grid;
}

.primary-navigation button {
  min-height: var(--touch-size);
  padding: 0.65rem 0.85rem;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--cream-100);
  text-align: left;
}

.primary-navigation button:hover,
.primary-navigation button[aria-current="page"] {
  background: rgba(245, 199, 111, 0.1);
  color: var(--gold-300);
}

.main-content {
  width: min(100%, var(--content-width));
  margin: 0 auto;
  padding: clamp(1.5rem, 5vw, 4rem) 1rem;
  outline: 0;
}

.screen {
  display: grid;
  gap: clamp(1.35rem, 4vw, 2.25rem);
}

.screen-reading {
  width: min(100%, var(--reading-width));
  margin-inline: auto;
}

.screen-header {
  display: grid;
  gap: 0.75rem;
}

.screen-header > p:not(.eyebrow) {
  max-width: 46rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.screen-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.split-layout {
  display: grid;
  gap: 1.25rem;
}

.sidebar-nav {
  display: flex;
  gap: 0.5rem;
  padding-bottom: 0.35rem;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scrollbar-width: thin;
}

.sidebar-nav button {
  flex: 0 0 auto;
}

.content-stack {
  display: grid;
  gap: 1.25rem;
}

.two-column {
  display: grid;
  gap: 1rem;
}

.three-column {
  display: grid;
  gap: 1rem;
}

.site-footer {
  display: grid;
  justify-items: center;
  gap: 0.9rem;
  padding: 1.25rem max(1rem, calc((100% - var(--content-width)) / 2));
  border-top: 1px solid var(--line);
  background: rgba(4, 11, 18, 0.72);
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
}

.social-link {
  display: grid;
  width: 3.4rem;
  height: 3.4rem;
  place-items: center;
  border: 1px solid rgba(255, 248, 234, 0.24);
  border-radius: 50%;
  background: rgba(255, 248, 234, 0.07);
  color: var(--cream-100);
  text-decoration: none;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.social-link:hover {
  border-color: var(--gold-500);
  background: rgba(245, 199, 111, 0.13);
  color: var(--gold-300);
  transform: translateY(-2px);
}

.social-link svg {
  width: 1.45rem;
  height: 1.45rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

@media (min-width: 44rem) {
  .brand-copy small {
    display: block;
  }

  .two-column {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .three-column {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 60rem) {
  .nav-toggle {
    display: none;
  }

  .primary-navigation {
    position: static;
    display: flex;
    width: auto;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .primary-navigation button {
    padding-inline: 0.7rem;
  }

  .split-layout {
    grid-template-columns: 13rem minmax(0, 1fr);
    align-items: start;
  }

  .sidebar-nav {
    position: sticky;
    top: 6rem;
    display: grid;
    overflow: visible;
  }
}