/* Header — Sticky header + mobile menu */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding: var(--space-4) 0;
  transition: background-color var(--duration-base) var(--ease-out),
              padding var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out);
}

.header.is-scrolled {
  background-color: rgba(237, 232, 220, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: var(--space-3) 0;
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ── Logo ── */
.header__logo {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--weight-regular);
  color: var(--color-text);
  letter-spacing: var(--tracking-tight);
  text-decoration: none;
  z-index: calc(var(--z-header) + 2);
}

.header__logo span {
  font-style: italic;
}

/* ── Desktop Nav ── */
.header__nav {
  display: none;
}

@media (min-width: 1024px) {
  .header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-6);
  }
}

.header__nav-link {
  font-size: var(--text-sm);
  font-weight: var(--weight-regular);
  color: var(--color-text-body);
  text-decoration: none;
  position: relative;
  padding: var(--space-1) 0;
  transition: color var(--duration-fast) var(--ease-out);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--duration-base) var(--ease-out);
}

.header__nav-link:hover,
.header__nav-link.is-active {
  color: var(--color-accent);
}

.header__nav-link:hover::after,
.header__nav-link.is-active::after {
  width: 100%;
}

.header__nav-cta {
  margin-left: var(--space-4);
}

/* ── Hamburger ── */
.header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  z-index: calc(var(--z-header) + 2);
  background: none;
  border: none;
  padding: 0;
}

@media (min-width: 1024px) {
  .header__toggle {
    display: none;
  }
}

.header__toggle-line {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-text);
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
  transform-origin: center;
}

/* Hamburger → X */
.header__toggle.is-active .header__toggle-line:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

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

.header__toggle.is-active .header__toggle-line:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ── Mobile Menu Overlay ── */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-header) + 1);
  background-color: var(--color-cream);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-slow) var(--ease-out),
              visibility var(--duration-slow) var(--ease-out);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__link {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--weight-light);
  color: var(--color-text);
  text-decoration: none;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.mobile-menu.is-open .mobile-menu__link {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger animation */
.mobile-menu.is-open .mobile-menu__link:nth-child(1) { transition-delay: 100ms; }
.mobile-menu.is-open .mobile-menu__link:nth-child(2) { transition-delay: 150ms; }
.mobile-menu.is-open .mobile-menu__link:nth-child(3) { transition-delay: 200ms; }
.mobile-menu.is-open .mobile-menu__link:nth-child(4) { transition-delay: 250ms; }
.mobile-menu.is-open .mobile-menu__link:nth-child(5) { transition-delay: 300ms; }
.mobile-menu.is-open .mobile-menu__link:nth-child(6) { transition-delay: 350ms; }
.mobile-menu.is-open .mobile-menu__link:nth-child(7) { transition-delay: 400ms; }

.mobile-menu__link:hover {
  color: var(--color-accent);
}

.mobile-menu__cta {
  margin-top: var(--space-4);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out);
}

.mobile-menu.is-open .mobile-menu__cta {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 450ms;
}

@media (min-width: 1024px) {
  .mobile-menu {
    display: none;
  }
}