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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: var(--color-header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

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

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* ── Logo ── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
}

.nav-logo__icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: var(--fs-lg);
}

.nav-logo__text {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--color-text-heading);
}

.nav-logo__text span {
  color: var(--color-primary);
}

/* ── Desktop Nav Links ── */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-body);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--color-text-heading);
  background: transparent;
  font-size: calc(var(--fs-sm) * 1.08);
}

.nav-link.active {
  color: var(--color-primary);
}

/* ── Dropdown ── */
.nav-dropdown {
  position: relative;
}

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

.nav-dropdown__trigger svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown__trigger svg {
  transform: rotate(180deg);
}

.nav-dropdown__menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  min-width: 220px;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(8px);
  transition: all var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown__menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  color: var(--color-text-body);
  transition: all var(--transition-fast);
}

.nav-dropdown__item:hover {
  background: var(--color-bg-secondary);
  color: var(--color-text-heading);
}

.nav-dropdown__item-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-forest-50);
  color: var(--color-primary);
  flex-shrink: 0;
}

.nav-dropdown__item-icon svg {
  width: 16px;
  height: 16px;
}

.nav-dropdown__item-label {
  font-weight: var(--fw-medium);
  color: var(--color-text-heading);
  display: block;
}

.nav-dropdown__item-desc {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  display: block;
  margin-top: 2px;
}

/* ── Nav CTA ── */
.nav-cta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ── Theme Toggle ── */
.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-body);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--color-bg-secondary);
  color: var(--color-text-heading);
  border-color: var(--color-border);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
html.dark .theme-toggle .icon-sun { display: block; }
html.dark .theme-toggle .icon-moon { display: none; }

/* ── Mobile Toggle ── */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-heading);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

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

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

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

/* ── Mobile Menu ── */
.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-surface);
  z-index: var(--z-dropdown);
  padding: var(--space-6);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-base);
}

.mobile-menu.is-active {
  transform: translateX(0);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--fs-lg);
  font-weight: var(--fw-medium);
  color: var(--color-text-heading);
  border-bottom: 1px solid var(--color-border-light);
}

.mobile-menu__sub {
  padding-left: var(--space-4);
}

.mobile-menu__sub-link {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--fs-base);
  color: var(--color-text-body);
}

.mobile-menu__cta {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* Spacer for fixed header */
.header-spacer {
  height: 72px;
}