/* ============================================================
   TECHBITDEALS — Header & Navigation
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: transparent;
  transition: background var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition-slow);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(8, 8, 12, 0.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: rgba(255,255,255,0.06);
  box-shadow: 0 1px 0 rgba(255,255,255,0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
  transition: height var(--transition-normal);
}

.site-header.scrolled .header-inner {
  height: 52px;
}

/* --- Logo --- */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.logo__icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-black);
  font-size: var(--text-lg);
  color: var(--color-text-on-accent);
  transition: transform var(--transition-normal);
}

.logo:hover .logo__icon {
  transform: rotate(-5deg) scale(1.05);
}

.logo__text {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

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

/* --- Main Navigation --- */
.main-nav {
  display: none;
}

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

.main-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  font-size: 0.8rem;
  font-weight: var(--font-medium);
  color: rgba(255,255,255,0.72);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast);
  letter-spacing: 0.01em;
}

.main-nav__link:hover {
  color: #fff;
}

.main-nav__link.active {
  color: var(--color-accent-primary);
}

.main-nav__link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--color-accent-primary);
  border-radius: var(--radius-full);
}

/* --- Header Actions --- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* --- Language Switcher --- */
.lang-switch {
  display: flex;
  align-items: center;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  padding: 2px;
  border: 1px solid var(--color-border-default);
}

.lang-switch__btn {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lang-switch__btn.active {
  background: var(--color-accent-primary);
  color: var(--color-text-on-accent);
}

.lang-switch__btn:hover:not(.active) {
  color: var(--color-text-primary);
}

/* --- Mobile Menu Toggle --- */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: var(--space-2);
  cursor: pointer;
}

.menu-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  transform-origin: center;
}

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

.menu-toggle.open .menu-toggle__bar:nth-child(2) {
  opacity: 0;
}

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

/* --- Mobile Nav Overlay --- */
.mobile-nav {
  position: fixed;
  left: 0;
  right: 0;
  top: 64px;                            /* sits below the header bar */
  /* Use dynamic viewport height (100dvh) so iOS Safari URL bar doesn't
     leave a gap; fall back to fill-available + 100vh for older engines. */
  height: calc(100vh - 64px);
  height: calc(100dvh - 64px);
  background: #0a0a0f;                  /* fully opaque — no bleed-through */
  z-index: 450;                         /* above page content */
  display: flex;
  flex-direction: column;
  padding: var(--space-8) var(--space-6) calc(var(--space-12) + env(safe-area-inset-bottom));
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
  overscroll-behavior: contain;         /* prevent body scroll-chaining */
  -webkit-overflow-scrolling: touch;
}

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

.mobile-nav__link {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--text-2xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-default);
  transition: color var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link.active {
  color: var(--color-accent-primary);
}

/* Lock body scroll while the mobile menu is open
   (added/removed by Navigation.toggleMenu in app.js) */
body.menu-open {
  overflow: hidden;
  /* iOS-specific: also touch-action prevents bounce-scroll */
  touch-action: none;
}

/* --- Skip to content --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-3) var(--space-6);
  background: var(--color-accent-primary);
  color: var(--color-text-on-accent);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-md);
  z-index: var(--z-toast);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (min-width: 768px) {
  .header-inner {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .main-nav {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .mobile-nav {
    display: none;
  }

  .header-inner {
    padding-inline: var(--space-8);
  }
}