/* ============================================================
   nav.css — Sticky topbar, dropdown, language, mobile
   ============================================================ */

.nav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  display: flex; align-items: center;
  padding: 0 28px;
  gap: 28px;
  background: rgba(14,13,11,.55);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid transparent;
  transition: background .4s var(--ease), border-color .4s var(--ease);
}
.nav.scrolled {
  background: rgba(14,13,11,.85);
  border-bottom: 1px solid var(--line);
}

.nav-logo {
  display: flex; align-items: center; gap: 11px;
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.05rem; letter-spacing: -.01em;
  white-space: nowrap;
}
.nav-logo img {
  width: 34px; height: 34px; border-radius: 50%;
  /* recolor the black logo to warm white (normal text colour) */
  filter: invert(93%) sepia(8%) saturate(420%) hue-rotate(2deg) brightness(102%) contrast(96%);
  transition: transform .5s var(--ease);
}
.nav-logo:hover img { transform: rotate(90deg); }

.nav-links {
  display: flex; align-items: center; gap: 6px;
  margin-left: 12px;
}
.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: .95rem;
  color: var(--text-dim);
  border-radius: 8px;
  transition: color .25s var(--ease);
}
.nav-link:hover { color: var(--text); }
.nav-link::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 4px;
  height: 1.5px; background: var(--amber);
  transform: scaleX(0); transform-origin: left;
  transition: transform .3s var(--ease);
}
.nav-link:hover::after { transform: scaleX(1); }

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle { display: flex; align-items: center; gap: 6px; }
.nav-dropdown-toggle .caret { transition: transform .3s var(--ease); font-size: .7em; }
.nav-dropdown.open .caret { transform: rotate(180deg); }
.nav-dropdown-menu {
  position: absolute; top: calc(100% + 10px); left: 0;
  min-width: 250px;
  background: var(--surface-1);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 8px;
  box-shadow: 0 24px 60px rgba(0,0,0,.6);
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: opacity .28s var(--ease), transform .28s var(--ease), visibility .28s;
}
.nav-dropdown.open .nav-dropdown-menu { opacity: 1; visibility: visible; transform: none; }
.nav-dropdown-menu a {
  display: block; padding: 11px 14px; border-radius: 9px;
  font-size: .92rem; color: var(--text-dim);
  transition: background .2s, color .2s, padding-left .2s var(--ease);
}
.nav-dropdown-menu a:hover { background: var(--surface-2); color: var(--text); padding-left: 20px; }

.nav-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }

/* Language toggle */
.lang-switch {
  display: flex; align-items: center;
  border: 1px solid var(--line); border-radius: 30px; overflow: hidden;
}
.lang-btn {
  padding: 6px 13px; font-size: .78rem; font-weight: 600;
  font-family: var(--font-display); color: var(--text-dim);
  transition: color .2s, background .2s;
}
.lang-btn.active { background: var(--amber); color: var(--bg); }

/* Hamburger */
.nav-burger { display: none; flex-direction: column; gap: 5px; padding: 10px; }
.nav-burger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .3s var(--ease), opacity .3s; }
body.menu-open .nav-burger span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
body.menu-open .nav-burger span:nth-child(2){ opacity: 0; }
body.menu-open .nav-burger span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

/* Mobile overlay */
.mobile-menu {
  position: fixed; inset: 0; z-index: 999;
  background: rgba(14,13,11,.97);
  backdrop-filter: blur(8px);
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  gap: 6px;
  opacity: 0; visibility: hidden; transition: opacity .4s var(--ease), visibility .4s;
}
body.menu-open .mobile-menu { opacity: 1; visibility: visible; }
.mobile-menu a {
  font-family: var(--font-display); font-size: 1.6rem; color: var(--text-dim);
  padding: 12px; transition: color .25s, transform .25s var(--ease);
}
.mobile-menu a:hover { color: var(--amber); transform: scale(1.05); }
.mobile-menu .mm-sub { font-size: 1rem; color: var(--text-dim); opacity: .7; }
.mobile-menu .mm-lang { display: flex !important; margin-top: 24px; }
.mobile-menu .mm-lang .lang-btn { font-size: .9rem; padding: 8px 18px; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .lang-switch { display: none; }
  .nav-burger { display: flex; }
}
@media (min-width: 861px) {
  .mobile-menu { display: none; }
}