/* ========================================
   AN NHIÊN HOMESTAY — Header / Navigation
   ======================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--space-md) 0;
  transition: background var(--duration-normal) var(--ease-smooth),
              padding var(--duration-normal) var(--ease-smooth),
              box-shadow var(--duration-normal) var(--ease-smooth);
}

.header.scrolled {
  background: var(--color-glass);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  padding: var(--space-xs) 0;
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

/* ── Logo ── */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  z-index: var(--z-sticky);
}

.header__logo-img {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  object-fit: cover;
  transition: transform var(--duration-normal) var(--ease-smooth);
  box-shadow: var(--shadow-sm);
}

.header.scrolled .header__logo-img {
  width: 40px;
  height: 40px;
}

.header__logo:hover .header__logo-img {
  transform: scale(1.05);
}

.header__logo-text {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: var(--fw-regular);
  color: var(--color-white);
  transition: color var(--duration-normal) var(--ease-smooth);
}

.header.scrolled .header__logo-text {
  color: var(--color-brown-dark);
}

/* ── Navigation ── */
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.header__nav-link {
  font-family: var(--font-body);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-white);
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--duration-fast) var(--ease-smooth);
}

.header.scrolled .header__nav-link {
  color: var(--color-brown);
}

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

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

.header__nav-link:hover {
  color: var(--color-green-light);
}

.header.scrolled .header__nav-link:hover {
  color: var(--color-green);
}

/* ── CTA Button ── */
.header__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-white);
  background: var(--color-green);
  border-radius: var(--radius-full);
  transition: all var(--duration-normal) var(--ease-smooth);
}

.header__cta:hover {
  background: var(--color-green-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* ── Mobile Menu Toggle ── */
.header__menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: var(--z-sticky);
}

.header__menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--duration-normal) var(--ease-smooth);
}

.header.scrolled .header__menu-toggle span {
  background: var(--color-brown-dark);
}

.header__menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.header__menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.header__menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ── Mobile Overlay ── */
.header__mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: calc(var(--z-sticky) - 1);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-smooth), visibility var(--duration-normal);
}

.header__mobile-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .header__nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(350px, 85vw);
    height: 100vh;
    height: 100dvh;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-xl);
    background: var(--color-cream-light);
    box-shadow: var(--shadow-xl);
    transition: right var(--duration-slow) var(--ease-out);
    z-index: var(--z-sticky);
  }

  .header__nav.open {
    right: 0;
  }

  .header__nav-link {
    color: var(--color-brown-dark);
    font-size: var(--fs-body);
  }

  .header__menu-toggle {
    display: flex;
  }

  .header__mobile-overlay {
    display: block;
  }
}

@media (max-width: 480px) {
  .header__logo-text {
    font-size: 1.1rem;
  }
}