/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
  position: fixed;
  top: 3px; /* Below progress bar */
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: rgba(252, 251, 249, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

.header--scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ── Logo ── */

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.header__logo img {
  height: 64px;
  width: auto;
  object-fit: contain;
}

/* ── Desktop Navigation ── */

.nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  position: relative;
  padding: var(--space-2) 10px;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--color-navy);
  background-color: var(--gray-50);
}

.nav__link--active {
  color: var(--color-navy);
  font-weight: var(--weight-semibold);
}

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 10px;
  right: 10px;
  height: 2px;
  background-color: var(--color-red);
  border-radius: 1px;
}

/* ── Mobile Menu Toggle ── */

.header__menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.header__menu-toggle:hover {
  background-color: var(--gray-50);
}

.header__menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-navy);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

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

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

/* ── Mobile Navigation ── */

.nav-mobile {
  display: none;
  position: fixed;
  top: calc(var(--header-height) + 3px);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(252, 251, 249, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 999;
  overflow-y: auto;
  padding: var(--space-6);
}

.nav-mobile--open {
  display: block;
  animation: fadeSlideDown 250ms ease forwards;
}

.nav-mobile__link {
  display: block;
  padding: var(--space-4) var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-light);
  transition: color var(--transition-fast);
}

.nav-mobile__link:hover,
.nav-mobile__link--active {
  color: var(--color-navy);
}

.nav-mobile__link--active {
  border-left: 3px solid var(--color-red);
  padding-left: var(--space-4);
}

.nav-mobile__link:last-child {
  border-bottom: none;
}

@keyframes fadeSlideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Responsive ── */

/* ── Header Actions (search + hamburger) ── */

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

@media (max-width: 1140px) {
  .nav { display: none; }
  .header__menu-toggle { display: flex; }
}

@media (max-width: 768px) {
  .header__inner { padding: 0 var(--space-4); }
  .header__logo img { height: 48px; }
}