/* =========================================================
   Navigation — Giorgi Samukashvili Portfolio
   ========================================================= */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background var(--transition-slow), border-color var(--transition-slow);
}

.nav.scrolled {
  background: rgba(15, 15, 15, 0.88);
  border-bottom-color: var(--border-subtle);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: none;
}

/* Logo / Name */
.nav__logo {
  font-family: var(--font-heading);
  font-size: var(--size-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-base);
  color: var(--text-primary);
  text-decoration: none;
  transition: opacity var(--transition-fast);
  padding: var(--space-1) 0;
}

.nav__logo:hover {
  opacity: 0.75;
}

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

.nav__link {
  position: relative;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--size-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav__link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

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

.nav__link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 1px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--border-subtle);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.nav__hamburger:hover {
  border-color: var(--border-medium);
  background: rgba(255, 255, 255, 0.04);
}

.nav__hamburger-line {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base), background var(--transition-fast);
}

.nav__hamburger[aria-expanded="true"] .nav__hamburger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav__hamburger[aria-expanded="true"] .nav__hamburger-line:nth-child(2) {
  opacity: 0;
}
.nav__hamburger[aria-expanded="true"] .nav__hamburger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile menu */
@media (max-width: 768px) {
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-4) var(--space-5);
    background: rgba(15, 15, 15, 0.97);
    border-bottom: 1px solid var(--border-subtle);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
  }

  .nav__links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav__link {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
  }

  .nav__link.active::after {
    display: none;
  }
}