/* ============================================================
   YOUTAB · NAV  (top bar, logo, links, lang switcher, CTA)
   ============================================================ */

nav.site-nav {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1.4rem 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
  background: linear-gradient(to bottom, rgba(2, 2, 10, 0.92), transparent);
  -webkit-backdrop-filter: blur(6px);
          backdrop-filter: blur(6px);
  gap: 1rem;
}

.nav-logo {
  font-family: var(--f-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo .you { color: #fff; }
.nav-logo .tab {
  color: var(--cyan);
  text-shadow: 0 0 25px var(--cyan);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}
.nav-links a {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  color: rgba(200, 200, 255, 0.55);
  text-decoration: none;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  transition: color 0.3s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width 0.3s;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] { color: var(--cyan); }
.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after { width: 100%; }

/* Language switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: rgba(200, 200, 255, 0.45);
  text-transform: uppercase;
}
.lang-switcher a {
  color: rgba(200, 200, 255, 0.45);
  text-decoration: none;
  padding: 0.2rem 0.45rem;
  border: 1px solid transparent;
  transition: color 0.25s, border-color 0.25s, background 0.25s;
}
.lang-switcher a:hover { color: var(--cyan); }
.lang-switcher a[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--border);
  background: rgba(0, 240, 255, 0.06);
}
.lang-sep { opacity: 0.25; }

.nav-cta {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  padding: 0.6rem 1.4rem;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  background: rgba(0, 240, 255, 0.06);
  cursor: none;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  transition: all 0.3s;
  clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
  text-decoration: none;
  display: inline-block;
}
.nav-cta:hover {
  background: rgba(0, 240, 255, 0.15);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

/* Mobile hamburger (progressive enhancement) */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--cyan);
  font-family: var(--f-mono);
  font-size: 0.7rem;
  padding: 0.5rem 0.8rem;
  cursor: none;
  letter-spacing: 0.15em;
}

@media (max-width: 900px) {
  nav.site-nav { padding: 1.2rem 1.5rem; flex-wrap: wrap; }
  .nav-links {
    order: 4;
    width: 100%;
    flex-direction: column;
    gap: 0.8rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    margin-top: 0.6rem;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: inline-block; }
}