nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100; padding: 0 2rem; height: 68px;
  display: flex; align-items: center; justify-content: space-between;
  transition: background 0.4s, backdrop-filter 0.4s, border-bottom 0.4s;
}
nav.scrolled {
  background: rgba(5,8,15,0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-family: 'Syne', sans-serif; font-size: 1.6rem;
  font-weight: 800; letter-spacing: 0.06em; color: #fff; text-decoration: none;
}
.nav-logo span { color: var(--blue); }
.nav-links { display: flex; gap: 2.2rem; list-style: none; }
.nav-links a {
  color: var(--muted); text-decoration: none; font-size: 0.86rem;
  font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase;
  transition: color 0.22s;
}
.nav-links a:hover { color: var(--blue); }
.nav-cta {
  background: var(--blue) !important; color: #05080f !important;
  padding: 0.42rem 1.1rem; border-radius: 6px; font-weight: 700 !important;
}
.nav-cta:hover { background: #7acfff !important; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s; }

/* ── UTILITY BUTTONS (theme + lang) ── */
.nav-utils { display: flex; align-items: center; gap: 0.5rem; }
.nav-icon-btn {
  width: 32px; height: 32px; border-radius: 8px;
  background: transparent; border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--muted); cursor: pointer;
  transition: color .22s, border-color .22s, background .22s;
}
.nav-icon-btn:hover { color: var(--blue); border-color: rgba(90,184,245,.4); background: rgba(90,184,245,.06); }
.nav-icon-btn svg { display: block; }
.nav-lang-btn {
  height: 32px; padding: 0 0.65rem; border-radius: 8px;
  background: transparent; border: 1px solid var(--border);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em;
  color: var(--muted); cursor: pointer;
  transition: color .22s, border-color .22s, background .22s;
}
.nav-lang-btn:hover { color: var(--blue); border-color: rgba(90,184,245,.4); background: rgba(90,184,245,.06); }

/* Light mode overrides */
[data-theme="light"] .nav-icon-btn,
[data-theme="light"] .nav-lang-btn { border-color: rgba(26,61,96,.2); color: var(--muted); }
[data-theme="light"] .nav-icon-btn:hover,
[data-theme="light"] .nav-lang-btn:hover { color: var(--blue); border-color: var(--blue); background: rgba(90,184,245,.08); }
[data-theme="light"] .nav-toggle span { background: var(--text); }

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  nav { padding: 0 1rem; height: 60px; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-lang-btn { font-size: 0.64rem; padding: 0 0.5rem; height: 28px; }
  .nav-icon-btn { width: 28px; height: 28px; }
  .nav-links.open {
    display: flex; flex-direction: column; position: fixed;
    top: 60px; left: 0; right: 0;
    background: rgba(5,8,15,.97); backdrop-filter: blur(16px);
    padding: 2rem; border-bottom: 1px solid var(--border); gap: 1.5rem;
  }
  [data-theme="light"] .nav-links.open { background: rgba(240,244,250,.97); }
}