/* ============================================================
   AS Apps Developer Portal — Navigation
   ============================================================
   Sticky header with transparent → blur transition.
   Mobile hamburger menu. Theme toggle switch.
   ============================================================ */

/* ================================================================
   HEADER
   ================================================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--space-4) 0;
  transition:
    background-color var(--transition-base),
    backdrop-filter var(--transition-base),
    -webkit-backdrop-filter var(--transition-base),
    border-color var(--transition-base),
    padding var(--transition-base);
  border-bottom: 1px solid transparent;
}

/* ── Scrolled state (added by JS) ── */
.header.is-scrolled {
  background: var(--glass-bg-nav);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom-color: var(--color-border);
  padding: var(--space-3) 0;
}

/* ── Inner layout ── */
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

/* ================================================================
   LOGO
   ================================================================ */

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--font-bold);
  font-size: var(--text-xl);
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.8;
}

.logo__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-lg);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: var(--font-bold);
  font-size: var(--text-sm);
}

.logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.logo__text span:first-child {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
}

.logo__text span:last-child {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  font-weight: var(--font-regular);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  margin-top: 2px;
}

/* ================================================================
   DESKTOP NAVIGATION
   ================================================================ */

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

.nav__link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  position: relative;
  transition:
    color var(--transition-base),
    background-color var(--transition-base);
}

.nav__link:hover {
  color: var(--color-text);
  background: var(--color-primary-subtle);
}

.nav__link.is-active {
  color: var(--color-primary-light);
}

/* ── Animated underline ── */
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: var(--space-4);
  right: var(--space-4);
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-base);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  transform: scaleX(1);
}

/* ── Hide desktop nav on mobile ── */
@media (max-width: 1024px) {
  .nav {
    display: none;
  }
}

/* ================================================================
   HEADER ACTIONS (Theme + Mobile Toggle)
   ================================================================ */

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

/* ================================================================
   THEME TOGGLE
   ================================================================ */

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid var(--color-border);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition:
    background-color var(--transition-base),
    border-color var(--transition-base),
    color var(--transition-base);
}

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

.theme-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-spring);
}

.theme-toggle:hover svg {
  transform: rotate(15deg);
}

/* ── Show/hide icons based on theme ── */
.theme-toggle .icon-sun {
  display: none;
}

.theme-toggle .icon-moon {
  display: block;
}

[data-theme="light"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="light"] .theme-toggle .icon-moon {
  display: none;
}

/* ================================================================
   MOBILE MENU TOGGLE
   ================================================================ */

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid var(--color-border);
  cursor: pointer;
  gap: 5px;
  padding: 10px;
  transition:
    background-color var(--transition-base),
    border-color var(--transition-base);
}

.mobile-toggle:hover {
  background: var(--color-surface);
  border-color: var(--color-border-hover);
}

.mobile-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition:
    transform var(--transition-base),
    opacity var(--transition-base);
  transform-origin: center;
}

/* ── Hamburger → X animation ── */
.mobile-toggle.is-active .mobile-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-toggle.is-active .mobile-toggle__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-toggle.is-active .mobile-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 1024px) {
  .mobile-toggle {
    display: flex;
  }
}

/* ================================================================
   MOBILE MENU OVERLAY
   ================================================================ */

.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  width: min(85vw, 380px);
  height: 100vh;
  height: 100dvh;
  z-index: var(--z-overlay);
  background: var(--color-bg);
  border-left: 1px solid var(--color-border);
  padding: var(--space-20) var(--space-6) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
}

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

/* ── Backdrop ── */
.mobile-menu-backdrop {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-overlay) - 1);
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}

.mobile-menu-backdrop.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* ── Mobile Nav Links ── */
.mobile-menu__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-lg);
  transition:
    color var(--transition-base),
    background-color var(--transition-base);
}

.mobile-menu__link:hover,
.mobile-menu__link.is-active {
  color: var(--color-text);
  background: var(--color-primary-subtle);
}

/* ── Mobile Menu Footer ── */
.mobile-menu__footer {
  margin-top: auto;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

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