/* ============================================================
   site-nav.css — shared navigation bar for every modern page
   (index / index-j and all subpages). Markup: <nav class="site-nav">.
   Behaviour lives in common/js/site-nav.js.
   Pages supply --primary, --accent, --accent-light, --accent-mid,
   --text, --text-sec, --bg-sec, --border, --max-w and --nav-h.
   ============================================================ */

nav.site-nav {
  position: sticky;           /* the top pages override this with position: fixed */
  top: 0;
  z-index: 200;
  height: var(--nav-h);
  background: rgba(255,255,255,0.86);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .25s, background .25s;
}
nav.site-nav.scrolled { background: rgba(255,255,255,0.94); box-shadow: 0 6px 24px -12px rgba(15,32,68,.18); }
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.nav-brand {
  font-weight: 700;
  font-size: .95rem;
  color: var(--primary);
  letter-spacing: -.01em;
  white-space: nowrap;
  text-decoration: none !important;
}
.nav-brand span { font-weight: 400; color: var(--text-sec); font-size: .82rem; margin-left: .45rem; }
.nav-right { display: flex; align-items: center; gap: .35rem; }

.nav-menu { display: flex; align-items: center; gap: .1rem; list-style: none; }
.nav-menu > li > a,
.nav-more-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  font: inherit;
  font-size: .82rem;
  font-weight: 500;
  color: var(--text-sec);
  padding: .38rem .68rem;
  border-radius: 8px;
  border: 0;
  background: none;
  cursor: pointer;
  white-space: nowrap;
  transition: color .15s, background .15s;
}
.nav-menu > li > a:hover,
.nav-more-btn:hover,
.nav-more.open .nav-more-btn { color: var(--accent); background: var(--accent-light); text-decoration: none; }
.nav-menu > li > a.active { color: var(--primary); font-weight: 600; }
.nav-menu > li > a::after {
  content: '';
  position: absolute;
  left: .68rem; right: .68rem; bottom: .12rem;
  height: 2px; border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform .25s ease;
}
.nav-menu > li > a.active::after { transform: scaleX(1); }
.nav-sep { width: 1px; height: 18px; background: var(--border); margin: 0 .3rem; }
.nav-label { display: none; }

/* "Pages" dropdown */
.nav-more { position: relative; }
.nav-more-btn svg { width: 12px; height: 12px; transition: transform .2s; }
.nav-more.open .nav-more-btn svg { transform: rotate(180deg); }
.nav-dropdown {
  position: absolute;
  top: calc(100% + 12px);
  right: -.5rem;
  width: 320px;
  list-style: none;
  padding: .45rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 22px 44px -16px rgba(15,32,68,.28), 0 2px 6px rgba(15,32,68,.06);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px) scale(.98);
  transform-origin: top right;
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
}
.nav-dropdown::before {               /* hover bridge */
  content: ''; position: absolute; left: 0; right: 0; top: -14px; height: 14px;
}
.nav-more.open .nav-dropdown { opacity: 1; visibility: visible; transform: none; }
.nav-dropdown a {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: .75rem;
  align-items: center;
  padding: .55rem .6rem;
  border-radius: 10px;
  color: var(--text);
  text-decoration: none !important;
  transition: background .15s;
}
.nav-dropdown a:hover, .nav-dropdown a:focus-visible { background: var(--bg-sec); }
.dd-ico {
  width: 36px; height: 36px; border-radius: 10px;
  display: grid; place-items: center;
  font-size: 1.02rem;
  background: var(--accent-light);
  border: 1px solid var(--accent-mid);
  transition: transform .2s;
}
.nav-dropdown a:hover .dd-ico { transform: scale(1.06); }
.dd-title { display: block; font-size: .86rem; font-weight: 600; color: var(--primary); line-height: 1.35; }
.dd-sub { display: block; font-size: .72rem; color: var(--text-sec); line-height: 1.45; }

.lang-pill {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  margin-left: .45rem;
}
.lang-pill a {
  font-size: .75rem;
  font-weight: 700;
  padding: .22rem .6rem;
  color: var(--text-sec);
  transition: all .15s;
}
.lang-pill a.on { background: var(--accent); color: #fff; }
.lang-pill a:hover { text-decoration: none; }

/* hamburger */
.nav-toggle {
  display: none;
  position: relative;
  width: 40px; height: 40px;
  margin-left: .35rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
}
.nav-toggle span {
  position: absolute; left: 11px; right: 11px; height: 2px;
  border-radius: 2px; background: var(--primary);
  transition: transform .28s ease, opacity .2s, top .28s ease;
}
.nav-toggle span:nth-child(1) { top: 13px; }
.nav-toggle span:nth-child(2) { top: 19px; }
.nav-toggle span:nth-child(3) { top: 25px; }
nav.site-nav.open .nav-toggle span:nth-child(1) { top: 19px; transform: rotate(45deg); }
nav.site-nav.open .nav-toggle span:nth-child(2) { opacity: 0; }
nav.site-nav.open .nav-toggle span:nth-child(3) { top: 19px; transform: rotate(-45deg); }
.nav-backdrop {
  position: fixed; inset: var(--nav-h) 0 0 0; z-index: 190;
  background: rgba(15,32,68,.28);
  backdrop-filter: blur(2px);
  opacity: 0; visibility: hidden;
  transition: opacity .25s, visibility .25s;
}

@media (hover: hover) and (min-width: 921px) {
  .nav-more:hover .nav-dropdown { opacity: 1; visibility: visible; transform: none; }
  .nav-more:hover .nav-more-btn svg { transform: rotate(180deg); }
}

@media (max-width: 920px) {
  .nav-toggle { display: block; }
  .nav-sep { display: none; }
  .nav-menu {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    z-index: 195;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .4rem;
    align-items: stretch;
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
    padding: 1rem 1.25rem 1.4rem;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 24px 40px -20px rgba(15,32,68,.35);
    opacity: 0; visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
  }
  nav.site-nav.open .nav-menu { opacity: 1; visibility: visible; transform: none; }
  nav.site-nav.open ~ .nav-backdrop { opacity: 1; visibility: visible; }
  .nav-label {
    display: block;
    grid-column: 1 / -1;
    font-size: .68rem; font-weight: 700; letter-spacing: .1em;
    text-transform: uppercase; color: var(--text-sec);
    padding: .1rem .15rem;
  }
  .nav-menu > li > a {
    width: 100%;
    font-size: .9rem;
    padding: .6rem .8rem;
    background: var(--bg-sec);
    border: 1px solid var(--border);
    border-radius: 10px;
  }
  .nav-menu > li > a::after { display: none; }
  .nav-menu > li > a.active { background: var(--accent-light); border-color: var(--accent-mid); color: var(--accent); }
  .nav-more { grid-column: 1 / -1; margin-top: .5rem; }
  .nav-more-btn {
    pointer-events: none;
    padding: .1rem .15rem .45rem;
    font-size: .68rem; font-weight: 700; letter-spacing: .1em;
    text-transform: uppercase; color: var(--text-sec);
  }
  .nav-more-btn svg { display: none; }
  .nav-more.open .nav-more-btn { background: none; color: var(--text-sec); }
  .nav-dropdown {
    position: static; width: auto;
    display: grid; grid-template-columns: 1fr 1fr; gap: .4rem;
    padding: 0; border: 0; box-shadow: none; background: none;
    opacity: 1; visibility: visible; transform: none;
  }
  .nav-dropdown::before { display: none; }
  .nav-dropdown a { border: 1px solid var(--border); background: #fff; }
  body.nav-open { overflow: hidden; }
}
@media (max-width: 520px) {
  .nav-brand span { display: none; }
  .nav-dropdown { grid-template-columns: 1fr; }
}

/* ----- Subpage variant: the menu lists the site's pages ----- */
.nav-menu--pages .dd-ico,
.nav-menu--pages .dd-sub { display: none; }
.nav-menu--pages .dd-title { display: inline; font: inherit; color: inherit; }
.nav-menu > li > a[aria-current="page"] { color: var(--primary); font-weight: 600; }
.nav-menu > li > a[aria-current="page"]::after { transform: scaleX(1); }

@media (max-width: 920px) {
  .nav-menu--pages .dd-ico,
  .nav-menu--pages .dd-sub { display: grid; }
  .nav-menu--pages .dd-sub { display: block; }
  .nav-menu--pages .dd-title { display: block; font-size: .86rem; font-weight: 600; color: var(--primary); line-height: 1.35; }
  .nav-menu--pages > li > a {
    display: grid;
    grid-template-columns: 36px 1fr;
    gap: .75rem;
    align-items: center;
    padding: .55rem .6rem;
    background: #fff;
    white-space: normal;
  }
  .nav-menu--pages > li > a[aria-current="page"] { background: var(--accent-light); border-color: var(--accent-mid); }
}
@media (max-width: 520px) {
  .nav-menu--pages { grid-template-columns: 1fr; }
}