/* =============================================
   NAV.CSS — Navigation
   iansullivanart.com
   ============================================= */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  transition: background-color var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.site-nav.scrolled {
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--color-border);
}

@media (prefers-color-scheme: dark) {
  .site-nav.scrolled {
    background-color: rgba(10, 10, 10, 0.92);
  }
}

/* ---- Container ---- */
.nav-container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ---- Logo ---- */
.nav-logo {
  font-weight: var(--font-weight-semibold);
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

/* ---- Desktop Links ---- */
.nav-links {
  display: flex;
  gap: var(--space-xl);
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0.5;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.nav-links a:hover,
.nav-links a.active {
  opacity: 1;
}

/* ---- Hamburger (injected by main.js) ---- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  padding: 0;
  background: none;
  border: none;
  z-index: 110;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-fg);
  border-radius: 1px;
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
  transform-origin: center;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Mobile Overlay ---- */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 95;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
  pointer-events: none;
}

.nav-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ---- Mobile Drawer ---- */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: min(300px, 80vw);
    height: 100vh;
    height: 100dvh;
    background-color: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-2xl);
    z-index: 105;
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-out);
    border-left: 1px solid var(--color-border);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: var(--text-xl);
    letter-spacing: 0.06em;
  }

  .nav-overlay {
    display: block;
  }
}