/* ==========================================================================
   Header & Navigation — Mobile-First
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(250, 250, 249, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition-base);
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  max-width: var(--container-wide);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .header-inner {
    height: 72px;
  }
}

/* ── Logo ──────────────────────────────────────────────────────────────── */
.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.logo__text {
  font-size: var(--fs-md);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  letter-spacing: var(--ls-tight);
  line-height: 1.2;
}

.logo__text span {
  display: block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-normal);
  color: var(--color-text-muted);
  letter-spacing: var(--ls-normal);
}

/* ── Desktop Nav ───────────────────────────────────────────────────────── */
.nav-desktop {
  display: none;
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
    align-items: center;
    gap: var(--space-1);
  }
}

.nav-desktop__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-desktop__list li {
  margin-bottom: 0;
}

.nav-desktop__link {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-desktop__link:hover,
.nav-desktop__link--active {
  color: var(--color-text);
  background: var(--color-bg-alt);
}

.nav-desktop__link--active {
  font-weight: var(--fw-semibold);
}

.nav-desktop__cta {
  margin-left: var(--space-3);
}

/* ── Mobile Menu Toggle ────────────────────────────────────────────────── */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: calc(var(--z-overlay) + 1);
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }
}

.menu-toggle__icon {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: background var(--transition-fast);
}

.menu-toggle__icon::before,
.menu-toggle__icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-base);
}

.menu-toggle__icon::before { top: -7px; }
.menu-toggle__icon::after  { bottom: -7px; }

/* Menu open state */
.menu-open .menu-toggle__icon {
  background: transparent;
}

.menu-open .menu-toggle__icon::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-open .menu-toggle__icon::after {
  bottom: 0;
  transform: rotate(-45deg);
}

/* ── Mobile Nav Overlay ────────────────────────────────────────────────── */
.nav-mobile {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-overlay);
  background: rgba(250, 250, 249, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

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

.nav-mobile__list {
  list-style: none;
  padding: 0;
  margin: 0;
  text-align: center;
}

.nav-mobile__list li {
  margin-bottom: var(--space-2);
}

.nav-mobile__link {
  display: inline-block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.nav-mobile__cta {
  margin-top: var(--space-8);
}

/* ── Body scroll lock ──────────────────────────────────────────────────── */
body.menu-open {
  overflow: hidden;
}