/* =========================================================================
   layout.css — containers, header/nav, footer, page-level grids
   ========================================================================= */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

section { padding-block: 4.5rem; }
section.alt { background: var(--paper-100); }

@media (max-width: 640px) {
  section { padding-block: 2.75rem; }
}

/* ---- Top identification bar -------------------------------------------- */
.gov-bar {
  background: var(--ink-950);
  color: var(--steel-300);
  font-size: 0.78rem;
}
.gov-bar__inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-block: 0.4rem;
}
.gov-bar__flag { font-size: 0.9rem; }
.gov-bar__inner button {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--steel-300);
  font-size: 0.75rem;
  text-decoration: underline;
  cursor: pointer;
  padding: 0.25rem 0.4rem;
}
.gov-bar__inner button:hover { color: var(--white); }

/* ---- Header / primary nav ---------------------------------------------- */
.site-header {
  background: var(--green-900);
  color: var(--paper-50);
  position: relative;
  z-index: 100;
  border-bottom: 3px solid var(--gold-600);
}
.site-header.is-stuck {
  position: sticky;
  top: 0;
  box-shadow: var(--shadow-md);
}

.masthead {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: 1.1rem;
}

.masthead__seal {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--green-700);
  border: 1px solid rgba(169, 134, 47, 0.55);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.masthead__seal img { width: 34px; height: 34px; }

.masthead__title {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.masthead__org {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}
.masthead__dept {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel-300);
}

.masthead__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ---- Primary navigation / mega menu ------------------------------------ */
.primary-nav {
  background: var(--green-800);
  border-top: 1px solid rgba(255,255,255,0.08);
}
.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
}
.primary-nav__item { position: relative; }
.primary-nav__link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.85rem 1rem;
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper-50);
  border-bottom: 3px solid transparent;
}
.primary-nav__link:hover,
.primary-nav__item.is-open .primary-nav__link {
  background: var(--green-700);
  border-bottom-color: var(--gold-600);
}
.primary-nav__caret { font-size: 0.6rem; transition: transform 0.15s ease; }
.primary-nav__item.is-open .primary-nav__caret { transform: rotate(180deg); }

.mega-menu {
  position: absolute;
  top: 100%; left: 0;
  min-width: 560px;
  background: var(--white);
  color: var(--ink-800);
  border: 1px solid var(--paper-200);
  box-shadow: var(--shadow-lg);
  padding: 1.5rem;
  display: none;
  grid-template-columns: 1.3fr 1fr;
  gap: 2rem;
}
.primary-nav__item.is-open .mega-menu { display: grid; }

.mega-menu__group h4 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blue-700);
  margin-bottom: 0.6rem;
  font-family: var(--font-mono);
}
.mega-menu__group ul li a {
  display: block;
  padding: 0.4rem 0;
  font-size: 0.92rem;
  border-bottom: 1px solid transparent;
}
.mega-menu__group ul li a:hover { color: var(--blue-700); }
.mega-menu__feature {
  background: var(--paper-100);
  border-radius: var(--radius-sm);
  padding: 1rem;
}
.mega-menu__feature .eyebrow { display: block; margin-bottom: 0.4rem; }

.nav-toggle {
  display: none;
  background: none; border: 1px solid rgba(255,255,255,0.3);
  color: var(--paper-50);
  padding: 0.45rem 0.6rem;
  border-radius: var(--radius-sm);
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav { display: none; }
  .primary-nav.is-mobile-open { display: block; }
  .primary-nav__list { flex-direction: column; }
  .mega-menu { position: static; min-width: 0; grid-template-columns: 1fr; box-shadow: none; }
}

/* ---- Threat condition banner (signature element) ------------------------ */
.threat-condition {
  background: var(--ink-950);
  border-top: 1px solid rgba(255,255,255,0.08);
}
.tc-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding-block: 0.85rem;
  flex-wrap: wrap;
}
.tc-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel-300);
  white-space: nowrap;
}
.tc-scale {
  display: flex;
  gap: 0.35rem;
  flex: 1;
  min-width: 260px;
}
.tc-tier {
  flex: 1;
  text-align: center;
  padding: 0.4rem 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(245,243,236,0.55);
  border-bottom: 3px solid rgba(255,255,255,0.12);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.tc-tier[data-tier="severe"] { border-color: color-mix(in srgb, var(--tc-severe) 45%, transparent); }
.tc-tier[data-tier="high"] { border-color: color-mix(in srgb, var(--tc-high) 45%, transparent); }
.tc-tier[data-tier="elevated"] { border-color: color-mix(in srgb, var(--tc-elevated) 45%, transparent); }
.tc-tier[data-tier="guarded"] { border-color: color-mix(in srgb, var(--tc-guarded) 45%, transparent); }
.tc-tier[data-tier="low"] { border-color: color-mix(in srgb, var(--tc-low) 45%, transparent); }

.tc-tier.is-active {
  color: var(--white);
  font-weight: 700;
}
.tc-tier.is-active[data-tier="severe"] { border-color: var(--tc-severe); background: rgba(122,34,34,0.18); }
.tc-tier.is-active[data-tier="high"] { border-color: var(--tc-high); background: rgba(156,90,34,0.18); }
.tc-tier.is-active[data-tier="elevated"] { border-color: var(--tc-elevated); background: rgba(169,134,47,0.18); }
.tc-tier.is-active[data-tier="guarded"] { border-color: var(--tc-guarded); background: rgba(59,95,134,0.18); }
.tc-tier.is-active[data-tier="low"] { border-color: var(--tc-low); background: rgba(47,92,63,0.18); }

.tc-meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--steel-300);
  white-space: nowrap;
}

/* ---- Breadcrumbs --------------------------------------------------------- */
.breadcrumbs {
  font-size: 0.82rem;
  color: var(--steel-700);
  padding-block: 1rem;
  border-bottom: 1px solid var(--paper-200);
}
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.breadcrumbs li:not(:last-child)::after { content: '›'; margin-left: 0.4rem; color: var(--steel-500); }
.breadcrumbs a { color: var(--blue-700); }
.breadcrumbs a:hover { text-decoration: underline; }

/* ---- Inner page layout (sidebar + content) ------------------------------ */
.page-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 3rem;
  padding-block: 3rem;
}
@media (max-width: 860px) {
  .page-layout { grid-template-columns: 1fr; }
}

.side-nav {
  align-self: start;
  position: sticky;
  top: 6.5rem;
  background: var(--paper-100);
  border: 1px solid var(--paper-200);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}
.side-nav h4 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blue-700);
  margin-bottom: 0.75rem;
}
.side-nav ul li a {
  display: block;
  padding: 0.5rem 0.1rem;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--paper-200);
  color: var(--ink-800);
}
.side-nav ul li:last-child a { border-bottom: none; }
.side-nav ul li a:hover { color: var(--blue-700); }
.side-nav ul li a[aria-current="page"] {
  color: var(--blue-700);
  font-weight: 700;
}

.page-content > * + * { margin-top: 1.4rem; }

/* ---- Footer -------------------------------------------------------------- */
.site-footer {
  background: var(--green-900);
  color: var(--steel-300);
  border-top: 3px solid var(--gold-600);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 2rem;
  padding-block: 3.5rem;
}
@media (max-width: 900px) {
  .footer-top { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .footer-top { grid-template-columns: 1fr; }
}
.footer-top h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gold-600);
  margin-bottom: 0.9rem;
}
.footer-top ul li a { font-size: 0.88rem; color: var(--steel-300); display: inline-block; padding: 0.28rem 0; }
.footer-top ul li a:hover { color: var(--white); }
.footer-brand p { font-size: 0.85rem; max-width: 32ch; color: var(--steel-300); margin-top: 0.75rem; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-block: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  font-size: 0.78rem;
}
.footer-bottom nav { margin-left: auto; display: flex; gap: 1.25rem; flex-wrap: wrap; }
.footer-bottom nav a:hover { text-decoration: underline; }

/* ---- Back to top --------------------------------------------------------- */
.back-to-top {
  position: fixed;
  right: 1.5rem; bottom: 1.5rem;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--green-900);
  color: var(--paper-50);
  border: 1px solid var(--gold-600);
  display: grid; place-items: center;
  box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  z-index: 90;
  cursor: pointer;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }