/* ============================================================
   navbar.css — IeltsBattles.com
   Mobile-first · Performance-optimised · Bootstrap 5 compat
   ============================================================ */

/* ── CSS Custom Properties ─────────────────────────────────── */
:root {
  --ib-navy:        #0A2540;
  --ib-navy-light:  #0D3060;
  --ib-accent:      #FF6B35;
  --ib-accent-dark: #E55A24;
  --ib-white:       #FFFFFF;
  --ib-white-90:    rgba(255,255,255,.90);
  --ib-white-60:    rgba(255,255,255,.60);
  --ib-white-10:    rgba(255,255,255,.10);
  --ib-white-06:    rgba(255,255,255,.06);
  --ib-shadow-sm:   0 1px 4px rgba(0,0,0,.18);
  --ib-shadow-md:   0 4px 16px rgba(0,0,0,.22);
  --ib-radius:      8px;
  --ib-height:      64px;
  --ib-transition:  .2s ease;
  --ib-font:        -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ── Header Shell ──────────────────────────────────────────── */
.ib-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--ib-height);
  background: var(--ib-navy);
  border-bottom: 1px solid var(--ib-white-10);
  z-index: 1030;
  /* no 'contain' — it breaks position:fixed stacking and position:absolute children */
  transition: box-shadow var(--ib-transition);
  font-family: var(--ib-font);
}

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

.ib-header-spacer {
  height: var(--ib-height);
}

.ib-header__inner {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px;
  gap: 8px;
  position: relative; /* anchor for .ib-nav position:absolute */
}

/* ── Brand ─────────────────────────────────────────────────── */
.ib-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
  outline-offset: 4px;
}

.ib-brand__img img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: 2px solid var(--ib-white-10);
  object-fit: cover;
  display: block;
}

.ib-brand__name {
  color: var(--ib-white);
  font-size: .97rem;
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1;
}

.ib-brand__name span {
  color: var(--ib-accent);
}

/* ── CTA Button ────────────────────────────────────────────── */
.ib-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: var(--ib-accent);
  color: var(--ib-white) !important;
  font-size: .88rem;
  font-weight: 700;
  letter-spacing: .01em;
  text-transform: uppercase;
  border-radius: var(--ib-radius);
  text-decoration: none;
  white-space: nowrap;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  min-height: 44px;
  transition: background var(--ib-transition), box-shadow var(--ib-transition);
}

.ib-cta-btn:hover,
.ib-cta-btn:focus-visible {
  background: var(--ib-accent-dark);
  box-shadow: 0 4px 14px rgba(255,107,53,.4);
  text-decoration: none;
  color: var(--ib-white) !important;
}

.ib-cta-btn--sm {
  padding: 8px 12px;
  font-size: .8rem;
}

.ib-cta-btn--full {
  width: 100%;
  justify-content: center;
  font-size: .92rem;
  padding: 14px 18px;
  border-radius: var(--ib-radius);
}

/* ── Mobile Controls ───────────────────────────────────────── */
.ib-mobile-controls {
  margin-left: auto;
}

/* ── Hamburger ─────────────────────────────────────────────── */
.ib-toggler {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: var(--ib-white-06);
  border: 1px solid var(--ib-white-10);
  border-radius: var(--ib-radius);
  cursor: pointer;
  flex-shrink: 0;
}

.ib-toggler__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ib-white);
  border-radius: 2px;
  transition: transform var(--ib-transition), opacity var(--ib-transition);
  transform-origin: center;
}

.ib-toggler[aria-expanded="true"] .ib-toggler__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.ib-toggler[aria-expanded="true"] .ib-toggler__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.ib-toggler[aria-expanded="true"] .ib-toggler__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Nav — Mobile (drawer) ─────────────────────────────────── */
.ib-nav {
  display: none;
  position: fixed;        /* fixed so it always spans full width */
  top: var(--ib-height);  /* sits directly below the 64px header */
  left: 0;
  right: 0;
  background: var(--ib-navy);
  border-top: 1px solid var(--ib-white-10);
  box-shadow: var(--ib-shadow-md);
  max-height: calc(100dvh - var(--ib-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  z-index: 1029;
}

.ib-nav.is-open {
  display: block;
}

.ib-nav__list {
  list-style: none;
  margin: 0;
  padding: 10px 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* ── Nav Links ─────────────────────────────────────────────── */
.ib-nav__item > a.nav-link,
.ib-nav__dropdown-btn,
.ib-login-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 12px 14px;
  min-height: 48px;
  color: var(--ib-white-90);
  font-size: .92rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--ib-radius);
  border: none;
  background: transparent;
  cursor: pointer;
  text-align: left;
  line-height: 1.3;
  transition: background var(--ib-transition), color var(--ib-transition);
}

.ib-nav__item > a.nav-link:hover,
.ib-nav__item > a.nav-link:focus-visible,
.ib-nav__dropdown-btn:hover,
.ib-nav__dropdown-btn:focus-visible,
.ib-login-btn:hover,
.ib-login-btn:focus-visible {
  background: var(--ib-white-06);
  color: var(--ib-white);
  text-decoration: none;
}

.ib-nav__item > a.nav-link.active,
.ib-login-btn.active {
  color: var(--ib-white);
  background: var(--ib-white-10);
}

.ib-nav__item > a.nav-link i,
.ib-nav__dropdown-btn i.fa-folder-open,
.ib-nav__dropdown-btn i.fa-blog,
.ib-login-btn i {
  width: 16px;
  text-align: center;
  color: var(--ib-white-60);
  font-size: .85rem;
  flex-shrink: 0;
}

/* ── Dropdown Button Layout ────────────────────────────────── */
.ib-nav__dropdown-btn {
  justify-content: space-between;
}

.ib-nav__btn-inner {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ib-nav__chevron {
  font-size: .72rem;
  color: var(--ib-white-60);
  transition: transform var(--ib-transition);
  flex-shrink: 0;
}

.ib-nav__dropdown-btn[aria-expanded="true"] .ib-nav__chevron {
  transform: rotate(180deg);
}

/* ── Dropdown Menu ─────────────────────────────────────────── */
.ib-dropdown {
  display: none;
  list-style: none;
  margin: 4px 0 0 0;
  padding: 6px 0 6px 8px;
  border-left: 2px solid var(--ib-white-10);
}

.ib-dropdown.is-open {
  display: block;
}

.ib-dropdown__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  min-height: 44px;
  color: var(--ib-white-90);
  font-size: .88rem;
  font-weight: 400;
  text-decoration: none;
  border-radius: calc(var(--ib-radius) - 2px);
  transition: background var(--ib-transition), color var(--ib-transition);
}

.ib-dropdown__item:hover,
.ib-dropdown__item:focus-visible {
  background: var(--ib-white-06);
  color: var(--ib-white);
  text-decoration: none;
}

.ib-dropdown__item i {
  width: 16px;
  text-align: center;
  color: var(--ib-white-60);
  font-size: .82rem;
  flex-shrink: 0;
}

.ib-dropdown__group-label {
  padding: 6px 14px 4px;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--ib-white-60);
  pointer-events: none;
}

.ib-dropdown__divider {
  height: 1px;
  background: var(--ib-white-10);
  margin: 4px 14px;
}

/* ── Login Button Variant ──────────────────────────────────── */
.ib-login-btn {
  color: var(--ib-white-90) !important;
}

/* ── Mobile-only CTA row ───────────────────────────────────── */
.ib-nav__item--mobile-cta {
  margin-top: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--ib-white-10);
}

/* ── Focus Styles (WCAG) ───────────────────────────────────── */
.ib-brand:focus-visible,
.ib-cta-btn:focus-visible,
.ib-toggler:focus-visible,
.ib-nav__item > a:focus-visible,
.ib-nav__dropdown-btn:focus-visible,
.ib-dropdown__item:focus-visible,
.ib-login-btn:focus-visible {
  outline: 2px solid var(--ib-accent);
  outline-offset: 2px;
}

/* ── Reduced Motion ────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .ib-toggler__bar,
  .ib-nav__chevron,
  .ib-cta-btn,
  .ib-header {
    transition: none;
  }
}

/* ── Desktop ≥ 992px ───────────────────────────────────────── */
@media (min-width: 992px) {

  .ib-header__inner {
    padding: 0 24px;
    gap: 0;
  }

  /* Nav resets to horizontal */
  .ib-nav {
    display: flex !important;
    position: static;
    background: transparent;
    border-top: none;
    box-shadow: none;
    max-height: none;
    overflow: visible;
    flex: 1;
    margin-left: 8px;
  }

  .ib-nav__list {
    flex-direction: row;
    align-items: center;
    padding: 0;
    gap: 2px;
    flex: 1;
    justify-content: flex-end;
  }

  .ib-nav__item {
    position: relative;
  }

  /* Shrink links on desktop */
  .ib-nav__item > a.nav-link,
  .ib-nav__dropdown-btn,
  .ib-login-btn {
    padding: 8px 12px;
    min-height: 44px;
    font-size: .88rem;
    width: auto;
    border-radius: var(--ib-radius);
  }

  /* Desktop dropdown panel */
  .ib-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 220px;
    background: #0E2D4F;
    border: 1px solid var(--ib-white-10);
    border-radius: var(--ib-radius);
    box-shadow: var(--ib-shadow-md);
    padding: 8px 0;
    margin: 0;
    border-left: none;
  }

  .ib-dropdown.is-open {
    display: block;
  }

  /* CTA spacing */
  .ib-nav__item--login {
    margin-left: 4px;
  }

  /* Hide mobile CTA list item */
  .ib-nav__item--mobile-cta {
    display: none;
  }

  /* Desktop: CTA btn after nav */
  .ib-cta-btn.d-none.d-lg-inline-flex {
    margin-left: 12px;
  }
}

/* ── Bootstrap d-* helper overrides (safety net) ───────────── */
@media (min-width: 992px) {
  .d-none.d-lg-inline-flex { display: inline-flex !important; }
  .d-lg-none               { display: none !important; }
  .d-lg-list-item          { display: list-item !important; }
}
@media (max-width: 991.98px) {
  .d-none.d-lg-inline-flex { display: none !important; }
  .d-lg-none               { display: flex !important; }
  .d-lg-list-item          { display: none !important; }
}