/* ==========================================================================
   NAVIGATION
   ========================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: var(--space-md) var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color var(--duration-normal) var(--ease-out),
              padding var(--duration-normal) var(--ease-out),
              backdrop-filter var(--duration-normal) var(--ease-out);
}

.nav--scrolled {
  background-color: rgba(225, 225, 225, 0.95);
  backdrop-filter: blur(10px);
  padding-block: var(--space-sm);
  box-shadow: 0 1px 0 var(--color-tan);
}

.nav__brand {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-cream);
  transition: color var(--duration-normal) var(--ease-out);
}

.nav--scrolled .nav__brand {
  color: var(--color-forest);
}

.nav__links {
  display: flex;
  gap: var(--space-xl);
}

@media (max-width: 767px) {
  .nav__links {
    display: none;
  }
}

.nav__link {
  font-size: var(--text-sm);
  color: var(--color-tan);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-amber);
  transition: width var(--duration-normal) var(--ease-out);
}

.nav__link:hover::after {
  width: 100%;
}

.nav--scrolled .nav__link {
  color: var(--color-espresso);
}

.nav__link:hover {
  color: var(--color-amber);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: calc(var(--z-overlay) + 1);
}

@media (max-width: 767px) {
  .nav__hamburger {
    display: flex;
  }
}

.nav__hamburger-line {
  width: 24px;
  height: 2px;
  background: var(--color-cream);
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out),
              background-color var(--duration-normal) var(--ease-out);
}

.nav--scrolled .nav__hamburger-line {
  background: var(--color-forest);
}

/* Hamburger open state */
.nav__hamburger--open .nav__hamburger-line {
  background: var(--color-cream);
}

.nav__hamburger--open .nav__hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__hamburger--open .nav__hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav__hamburger--open .nav__hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile overlay */
.nav__overlay {
  position: fixed;
  inset: 0;
  background: var(--color-forest);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-slow) var(--ease-out),
              visibility var(--duration-slow) var(--ease-out);
}

.nav__overlay--open {
  opacity: 1;
  visibility: visible;
}

.nav__overlay-link {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--color-cream);
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__overlay-link:hover {
  color: var(--color-amber);
}


/* ==========================================================================
   BUTTONS
   ========================================================================== */

.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-xl);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--color-amber);
  color: var(--color-amber);
  background: transparent;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
}

.btn:hover {
  background: var(--color-amber);
  color: var(--color-cream);
  transform: translateY(-1px);
}