/* ==========================================================================
   layout.css — header, footer, nav, structural containers
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: 0.55rem var(--space-4);
  background: linear-gradient(180deg, var(--color-header-bg), var(--color-header-bg-2));
  border-bottom: 1px solid var(--color-header-rule);
  box-shadow: 0 2px 0 0 rgba(207, 166, 70, 0.38), 0 4px 18px rgba(14, 38, 44, 0.4);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 600;
  color: var(--color-header-ink);
  text-decoration: none;
  white-space: nowrap;
}

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

.brand-mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  color: var(--color-header-accent);
  filter: drop-shadow(0 0 4px rgba(207, 166, 70, 0.42));
}

.brand-name em {
  font-style: normal;
  color: var(--color-header-accent);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  justify-self: center;
}

/* Direct-child combinator (> ul) is deliberate: it targets ONLY the
   top-level menu list, never the nested .nav-dropdown-menu submenu.
   Without it, these rules (specificity 0,1,1) outrank the submenu's own
   .nav-dropdown-menu rules (0,1,0) and force it open + absolutely
   positioned on mobile. */
.main-nav > ul {
  list-style: none;
  display: flex;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
}

.main-nav a {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-header-ink-soft);
  text-decoration: none;
  padding: 0.3em 0;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-header-accent);
  border-bottom-color: var(--color-header-accent);
}

.nav-toggle {
  display: none;
}

main {
  flex: 1 0 auto;
}

.page {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
}

/* Uniform, tighter top gap for the first section on every page,
   so every page sits the same distance below the header. */
main > .page:first-child {
  padding-top: var(--space-3);
}

/* Uniform, tighter bottom gap for the last section on every page,
   so the footer doesn't sit at the bottom of a very large empty gap. */
main > .page:last-child {
  padding-bottom: var(--space-3);
}

.prose {
  max-width: var(--content-width);
  margin: 0 auto;
}

.site-footer {
  background: linear-gradient(180deg, var(--color-header-bg-2), var(--color-header-bg));
  padding: var(--space-1) var(--space-4);
  text-align: right;
  color: var(--color-header-ink-soft);
  font-size: var(--step--1);
}

.site-footer-copyright {
  font-size: 0.75rem;
  opacity: 0.75;
  margin: 0;
  max-width: none;
}

.site-footer a { color: var(--color-header-ink-soft); }
.site-footer a:hover { color: var(--color-header-accent); }

@media (max-width: 720px) {
  /* .site-header is already position: sticky, which establishes a
     positioning context — so the mobile menu can be absolutely
     positioned relative to it and will always sit exactly below the
     header's real rendered height, instead of a hardcoded pixel guess
     that breaks if the header's size ever changes. */
  .main-nav > ul {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: calc(100vh - 100%);
    overflow-y: auto;
    background: var(--color-header-bg);
    flex-direction: column;
    padding: var(--space-4);
    gap: var(--space-3);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .main-nav.is-open > ul {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border: 1px solid var(--color-header-rule);
    background: transparent;
    color: var(--color-header-ink);
    border-radius: var(--radius);
    cursor: pointer;
  }

  .header-actions {
    display: flex;
    gap: var(--space-2);
    align-items: center;
  }
}

/* ---- Books dropdown nav (click-to-open) ---- */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-header-ink-soft);
  padding: 0.3em 0;
  border-bottom: 2px solid transparent;
}

.nav-dropdown-toggle:hover,
.nav-dropdown.is-open .nav-dropdown-toggle {
  color: var(--color-header-accent);
  border-bottom-color: var(--color-header-accent);
}

.nav-caret {
  font-size: 0.7em;
  transition: transform 0.15s ease;
  display: inline-block;
}

.nav-dropdown.is-open .nav-caret {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  background: var(--color-header-bg);
  border: 1px solid var(--color-header-rule);
  border-radius: var(--radius);
  padding: 0;
  width: auto;
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
  list-style: none;
  margin: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0 !important;
}

.nav-dropdown.is-open .nav-dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-menu li {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-header-ink-soft);
  text-decoration: none;
  border-bottom: none;
  white-space: nowrap;
}

.nav-dropdown-menu a:hover {
  background: var(--color-header-bg-2);
  color: var(--color-header-accent);
}

/* Mobile: inline below Books toggle */
@media (max-width: 720px) {
  .nav-dropdown-toggle {
    width: 100%;
    text-align: left;
  }

  .nav-dropdown-menu {
    position: static;
    transform: none;
    opacity: 1;
    pointer-events: auto;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--color-header-rule);
    border-radius: 0;
    margin-left: var(--space-3);
    display: none;
  }

  .nav-dropdown.is-open .nav-dropdown-menu {
    display: flex;
    /* Override the desktop open-state transform (translateX(-50%)),
       which would otherwise shift the inline accordion off to the left. */
    transform: none;
  }

  .nav-dropdown-menu a {
    padding: var(--space-1) var(--space-2);
  }
}