/* ============================================
   ELVIQA — Navigation
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: var(--color-bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base);
}

.nav.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
  background: color-mix(in srgb, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.nav__logo-mark {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  font-family: var(--font-display);
  flex-shrink: 0;
}

/* Desktop links */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: var(--space-2) var(--space-3);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
}

.nav__link:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-subtle);
}

.nav__link.active {
  color: var(--color-accent);
}

/* Controls group (dark mode + lang + CTA) */
.nav__controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Icon buttons (dark mode, lang) */
.nav__icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  flex-shrink: 0;
}

.nav__icon-btn:hover {
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
  background: var(--color-bg-subtle);
}

.nav__icon-btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* CTA Button */
.btn-cta {
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  white-space: nowrap;
}

.btn-cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Hamburger (mobile) */
.nav__hamburger {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
}

.nav__hamburger span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav__hamburger.open span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* Mobile drawer */
.nav__drawer {
  display: none;
  position: fixed;
  top: var(--nav-height);
  inset-inline: 0;
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-5) var(--space-5);
  z-index: 99;
  flex-direction: column;
  gap: var(--space-1);
  box-shadow: var(--shadow-md);
}

.nav__drawer.open {
  display: flex;
}

.nav__drawer .nav__link {
  padding: var(--space-3) var(--space-3);
  font-size: 1rem;
}

.nav__drawer .btn-cta {
  margin-top: var(--space-3);
  text-align: center;
  padding: var(--space-3);
}

/* Body offset for fixed nav */
body {
  padding-top: var(--nav-height);
}

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
  .nav__inner { padding-inline: var(--space-5); }
}

@media (max-width: 480px) {
  .btn-cta.nav__cta-desktop { display: none; }
}