/* ========================================
   Navigation
   ======================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background-color: rgba(245, 245, 247, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-fast);
}

.nav.nav--scrolled {
  background-color: rgba(245, 245, 247, 0.92);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* ========================================
   Logo
   ======================================== */

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.02em;
  transition: opacity var(--transition-fast);
  flex-shrink: 0;
}

.nav__logo:hover {
  opacity: 0.7;
  color: var(--color-text-primary);
}

.nav__logo-mark {
  color: var(--color-accent);
}

.nav__logo-img {
  height: 30px;
  width: auto;
  object-fit: contain;
}

/* ========================================
   Desktop Links
   ======================================== */

.nav__links {
  display: none;
  align-items: center;
  gap: 32px;
}

.nav__link {
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--color-accent);
  transition: width var(--transition-medium);
}

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

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

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

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

/* ========================================
   Desktop CTA Button
   ======================================== */

.nav__cta {
  display: none;
  padding: 8px 20px;
  font-size: var(--font-size-small);
}

/* ========================================
   Hamburger Button
   ======================================== */

.nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  cursor: pointer;
  z-index: 1001;
}

.nav__hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition:
    transform var(--transition-medium),
    opacity var(--transition-fast);
  transform-origin: center;
}

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

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

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

/* ========================================
   Mobile Menu
   ======================================== */

.nav__mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999;
  background-color: #f5f5f7;
  display: flex;
  flex-direction: column;
  padding: calc(var(--nav-height) + 40px) var(--container-padding) 40px;
  visibility: hidden;
  pointer-events: none;
  opacity: 0;
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast);
}

.nav__mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.nav__mobile-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav__mobile-link {
  color: var(--color-text-primary);
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 700;
  letter-spacing: var(--letter-spacing-tight);
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}

.nav__mobile-link:hover {
  color: var(--color-accent);
}

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

.nav__mobile-cta {
  margin-top: 32px;
  align-self: flex-start;
}

/* ========================================
   Body scroll lock when menu is open
   ======================================== */

body.nav-open {
  overflow: hidden;
}

body.nav-open .nav {
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background-color: #f5f5f7;
}

/* ========================================
   Responsive — show desktop nav on tablet+
   ======================================== */

@media (min-width: 769px) {
  .nav__hamburger {
    display: none;
  }

  .nav__mobile-menu {
    display: none;
  }

  .nav__links {
    display: flex;
  }

  .nav__cta {
    display: inline-flex;
  }
}