/* ─── Navigation ─────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: var(--sp-4) 0;
  transition: background var(--t-base), backdrop-filter var(--t-base), border-color var(--t-base);
  border-bottom: 1px solid transparent;
}

.nav.nav--scrolled {
  background: rgba(11, 11, 18, 0.82);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--c-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.nav__logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}

.logo-nx {
  background: var(--g-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-id {
  color: var(--c-text);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-left: auto;
}

.nav__link {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--c-text-2);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-md);
  transition: color var(--t-fast), background var(--t-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 50%; right: 50%;
  height: 2px;
  background: var(--g-brand);
  border-radius: var(--r-full);
  transition: left var(--t-base), right var(--t-base);
}

.nav__link:hover,
.nav__link--active {
  color: var(--c-text);
  background: rgba(124, 58, 237, 0.08);
}

.nav__link--active::after,
.nav__link:hover::after {
  left: var(--sp-4);
  right: var(--sp-4);
}

.nav__link--cta {
  background: rgba(124, 58, 237, 0.15);
  color: var(--c-purple-light);
  border: 1px solid var(--c-border-2);
}

.nav__link--cta:hover {
  background: var(--c-purple);
  color: #fff;
  border-color: var(--c-purple);
  box-shadow: var(--shadow-btn);
}

.nav__link--cta::after { display: none; }

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--sp-2);
}

/* Controls group (lang + theme + burger) */
.nav__controls {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-left: auto;
}

.nav__ctrl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 8px;
  gap: 4px;
  border-radius: var(--r-md);
  border: 1px solid var(--c-border);
  background: rgba(124, 58, 237, 0.06);
  color: var(--c-text-2);
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all var(--t-fast);
}
.nav__ctrl-btn:hover {
  border-color: var(--c-border-2);
  color: var(--c-text);
  background: rgba(124, 58, 237, 0.12);
}
.nav__theme-btn { font-size: 1rem; }

.nav__burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--c-text);
  border-radius: var(--r-full);
  transition: transform var(--t-base), opacity var(--t-base);
}

@media (max-width: 640px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }

  .nav.nav--open .nav__links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--c-bg-2);
    border-bottom: 1px solid var(--c-border);
    padding: var(--sp-4);
    gap: var(--sp-2);
  }

  .nav.nav--open .nav__burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.nav--open .nav__burger span:nth-child(2) { opacity: 0; }
  .nav.nav--open .nav__burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}