/* ==========================================================================
   BRIXVEN — Navigation
   ========================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding-block: var(--space-lg);
  transition: padding var(--duration-base) var(--ease-standard),
              background var(--duration-base) var(--ease-standard),
              box-shadow var(--duration-base) var(--ease-standard),
              backdrop-filter var(--duration-base) var(--ease-standard);
}

.nav.is-scrolled {
  padding-block: var(--space-md);
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-soft);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  font-size: 1.25rem;
  color: var(--color-text);
}

.nav__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 1rem;
  transition: transform var(--duration-base) var(--ease-standard);
}

.nav__logo:hover .nav__logo-mark {
  transform: rotate(-8deg);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  position: relative;
  font-size: var(--text-small);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  padding-block: 4px;
}

.nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: width var(--duration-base) var(--ease-standard);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

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

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
}

.nav__toggle span {
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-standard),
              opacity var(--duration-base) var(--ease-standard);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__mobile {
  display: none;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-lg) var(--container-pad) var(--space-section);
  background: var(--color-light);
  border-top: 1px solid var(--color-border);
}

.nav__mobile.is-open {
  display: flex;
}

.nav__mobile-link {
  font-size: 1.1rem;
  font-weight: var(--weight-medium);
  padding-block: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__toggle { display: flex; }
  .nav__actions .btn { display: none; }
}