/* Shared site navigation: five top-level items + CTA, hover mega-panels on desktop, accordion on mobile.
   Markup lives inline in each page (so crawlers and no-JS visitors see every link); behaviour is in nav.js. */

nav.mnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: transparent;
  border: 0; /* pages ship their own 1px nav border, which shows as a light line over a light page background */
  padding: 0 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  overflow-x: clip; /* a closed panel centred under a right-hand item would otherwise widen the page */
}
/* Bar: solid dark at the top of the page (nothing behind it to blur, and a translucent bar would turn grey over the
   light page background); gentle glass once content scrolls underneath. Glass lives on a pseudo-element because a
   backdrop-filter on nav itself would stop the panels blurring the page. */
nav.mnav::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: #111111;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background 0.25s ease;
}
nav.mnav.mn-scrolled::before {
  background: rgba(17,17,17,0.92);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  backdrop-filter: blur(22px) saturate(180%);
}

.mnav .mn-list {
  display: flex;
  align-items: stretch;
  gap: 4px;
  height: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

.mnav .mn-item { display: flex; align-items: center; position: relative; }

.mnav .mn-top {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 100%;
  padding: 0 14px;
  color: rgba(248,246,241,0.62);
  text-decoration: none;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.mnav .mn-top::after {
  content: '';
  width: 5px;
  height: 5px;
  margin-top: -3px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.2s;
}
.mnav .mn-item:hover > .mn-top,
.mnav .mn-item:focus-within > .mn-top,
.mnav .mn-item.is-open > .mn-top { color: #f8f6f1; }
.mnav .mn-item:hover > .mn-top::after,
.mnav .mn-item.is-open > .mn-top::after { transform: rotate(225deg); margin-top: 2px; }

.mnav .mn-sub-toggle { display: none; }

.mnav .mn-cta-item { margin-left: 14px; display: flex; align-items: center; }
.mnav .mn-cta {
  border: 1px solid rgba(212,212,212,0.4);
  color: #d4d4d4;
  padding: 8px 18px;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.mnav .mn-cta:hover { background: #d4d4d4; color: var(--ink, #111111); }

/* Panels hang from the bottom edge of the bar. The panel itself is a transparent hover bridge;
   the glass card inside floats a few px below the bar, so the pointer never crosses a dead gap. */
.mnav .mn-panel {
  position: absolute;
  top: 100%;
  left: 50%;
  width: max-content;
  max-width: calc(100vw - 48px);
  padding: 10px 0 0;
  visibility: hidden;
  opacity: 0;
  transform: translateX(calc(-50% + var(--mn-shift, 0px))) translateY(-6px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s linear 0.2s;
  pointer-events: none;
}
.mnav .mn-item:hover > .mn-panel,
.mnav .mn-item:focus-within > .mn-panel,
.mnav .mn-item.is-open > .mn-panel {
  visibility: visible;
  opacity: 1;
  transform: translateX(calc(-50% + var(--mn-shift, 0px)));
  transition-delay: 0s;
  pointer-events: auto;
}

.mnav .mn-panel-inner {
  display: flex;
  gap: 44px;
  padding: 30px 40px 34px;
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(20,20,20,0.78), rgba(12,12,12,0.86));
  -webkit-backdrop-filter: blur(34px) saturate(190%);
  backdrop-filter: blur(34px) saturate(190%);
  border: 1px solid rgba(255,255,255,0.10);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.12), 0 24px 60px rgba(0,0,0,0.55);
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  nav.mnav.mn-scrolled::before { background: #111111; }
  .mnav .mn-panel-inner { background: #111111; }
}
.mnav .mn-col { display: flex; flex-direction: column; gap: 9px; min-width: 190px; }
.mnav .mn-group {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(248,246,241,0.5);
  margin-top: 10px;
}
.mnav .mn-group:first-child { margin-top: 0; }
.mnav .mn-col > a {
  color: rgba(248,246,241,0.86);
  text-decoration: none;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 13px;
  line-height: 1.35;
  transition: color 0.2s;
}
.mnav .mn-col > a:hover { color: #f8f6f1; }
.mnav .mn-col > a.mn-all { color: #f8f6f1; margin-top: 4px; }
.mnav .mn-col-note { color: rgba(248,246,241,0.55); font-size: 12px; line-height: 1.5; max-width: 220px; font-family: 'IBM Plex Sans', sans-serif; }

.mnav .nav-toggle, .mnav .mn-book-mobile { display: none; }

@media (max-width: 1200px) and (min-width: 961px) {
  nav.mnav { padding: 0 28px; }
  .mnav .mn-panel-inner { padding: 26px 28px 30px; }
  .mnav .mn-top { padding: 0 10px; }
  .mnav .mn-panel-inner { gap: 28px; }
}

@media (max-width: 960px) {
  nav.mnav { padding: 0 24px; }

  .mnav .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
  }
  .mnav .nav-toggle span { display: block; width: 100%; height: 2px; background: #f8f6f1; }

  .mnav .mn-book-mobile {
    display: inline-block;
    margin-left: auto;
    margin-right: 14px;
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #f5f5f5;
    text-decoration: none;
    border: 1px solid rgba(255,255,255,0.3);
    padding: 7px 12px;
  }

  .mnav .mn-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    height: auto;
    max-height: calc(100vh - 68px);
    overflow-y: auto;
    background: rgba(17,17,17,0.9);
    -webkit-backdrop-filter: blur(26px) saturate(180%);
    backdrop-filter: blur(26px) saturate(180%);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding: 6px 24px 18px;
  }
  .mnav .mn-list.open { display: flex; }

  .mnav .mn-item { display: block; position: relative; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .mnav .mn-top { height: auto; padding: 16px 44px 16px 0; font-size: 12px; }
  .mnav .mn-top::after { display: none; }

  .mnav .mn-sub-toggle {
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    width: 44px;
    height: 50px;
    background: none;
    border: none;
    cursor: pointer;
    color: rgba(248,246,241,0.62);
  }
  .mnav .mn-sub-toggle::after {
    content: '';
    display: block;
    width: 7px;
    height: 7px;
    margin: 0 auto;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.2s;
  }
  .mnav .mn-item.is-open > .mn-sub-toggle::after { transform: rotate(225deg); }

  /* Hover does nothing on touch; panels open only through the toggle. */
  .mnav .mn-panel {
    position: static;
    display: none;
    width: auto;
    max-width: none;
    visibility: visible;
    opacity: 1;
    transform: none;
    padding: 0 0 14px 12px;
    transition: none;
    pointer-events: auto;
  }
  .mnav .mn-panel-inner {
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    box-shadow: none;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
  .mnav .mn-item:hover > .mn-panel,
  .mnav .mn-item:focus-within > .mn-panel { display: none; transform: none; }
  .mnav .mn-item.is-open > .mn-panel { display: block; transform: none; }
  .mnav .mn-panel-inner { flex-direction: column; gap: 14px; }
  .mnav .mn-col { min-width: 0; }
  .mnav .mn-col > a { padding: 3px 0; }
  .mnav .mn-col-note { display: none; }

  .mnav .mn-cta-item { margin: 14px 0 0; border-bottom: 0; }
  .mnav .mn-cta { display: block; text-align: center; padding: 12px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  .mnav .mn-panel, .mnav .mn-top::after { transition: none; }
}