/* =========================================================
   navbar.css – Main site navigation
   ========================================================= */

.sb-navbar {
  position: sticky;
  top: var(--sb-top-banner-h);
  z-index: 1000;
  background: var(--sb-white);
  height: var(--sb-navbar-h);
  border-bottom: 1px solid var(--sb-border);
  transition:
    box-shadow 0.3s ease,
    background 0.3s ease;
}

.sb-navbar.sb-scrolled {
  box-shadow: var(--sb-shadow-md);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
}

.sb-navbar__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--sb-space-6);
}

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

.sb-navbar__logo img {
  height: 110px;
  width: auto;
  object-fit: contain;
}

.sb-navbar__logo-text {
  font-size: var(--sb-text-xl);
  font-weight: var(--sb-fw-regular);
  color: var(--sb-dark);
  letter-spacing: -0.02em;
}
.sb-navbar__logo-text strong {
  font-weight: var(--sb-fw-extrabold);
  color: var(--sb-primary);
}

/* ── Menu Wrap ── */
.sb-navbar__menu-wrap {
  flex: 1;
  display: flex;
  justify-content: center;
}

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

/* ── Nav Items ── */
.sb-nav-item {
  position: relative;
}

.sb-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.55rem 0.85rem;
  font-size: var(--sb-text-sm);
  font-weight: var(--sb-fw-medium);
  color: var(--sb-dark-3);
  border-radius: var(--sb-radius-sm);
  transition: var(--sb-transition-fast);
  background: none;
  border: none;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}
.sb-nav-link:hover,
.sb-nav-link:focus-visible {
  color: var(--sb-primary);
  background: var(--sb-primary-light);
  outline: none;
}
.sb-nav-link--dropdown {
  gap: 4px;
}

.sb-dropdown-arrow {
  transition: transform 0.2s ease;
  color: var(--sb-muted);
}
.sb-nav-item--dropdown:hover .sb-dropdown-arrow,
.sb-nav-item--dropdown .sb-nav-link[aria-expanded="true"] .sb-dropdown-arrow {
  transform: rotate(180deg);
}

/* ── Dropdown Menu ── */
.sb-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 300px;
  background: var(--sb-white);
  border-radius: var(--sb-radius);
  border: 1px solid var(--sb-border);
  box-shadow: var(--sb-shadow-lg);
  padding: var(--sb-space-2) 0;
  list-style: none;
  margin: 0;

  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    visibility 0.2s;
  z-index: 200;
  max-height: min(72vh, 560px);
  overflow-y: auto;
}

.sb-dropdown--mega {
  width: min(980px, calc(100vw - 2rem));
  padding: 0;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(0, 103, 79, 0.14);
  box-shadow:
    0 28px 64px rgba(9, 30, 24, 0.18),
    0 10px 24px rgba(0, 103, 79, 0.1);
}

.sb-nav-item--dropdown:hover .sb-dropdown,
.sb-nav-item--dropdown:focus-within .sb-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* Small arrow pointing up */
.sb-dropdown::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 12px;
  height: 12px;
  background: var(--sb-white);
  border-top: 1px solid var(--sb-border);
  border-left: 1px solid var(--sb-border);
}

.sb-dropdown__item {
  display: flex;
  align-items: flex-start;
  gap: var(--sb-space-3);
  padding: var(--sb-space-3) var(--sb-space-5);
  font-size: var(--sb-text-sm);
  color: var(--sb-dark-2);
  text-decoration: none;
  transition: var(--sb-transition-fast);
}
.sb-dropdown__item:hover {
  background: var(--sb-primary-light);
  color: var(--sb-primary);
}
.sb-dropdown__item:hover .sb-dropdown__icon {
  background: var(--sb-primary);
  color: var(--sb-white);
}

.sb-dropdown__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  background: var(--sb-light);
  color: var(--sb-primary);
  border-radius: var(--sb-radius-sm);
  font-size: var(--sb-text-xs);
  font-weight: var(--sb-fw-extrabold);
  letter-spacing: -0.03em;
  transition: var(--sb-transition-fast);
  flex-shrink: 0;
}

.sb-dropdown__item span {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.sb-dropdown__item strong {
  font-size: var(--sb-text-sm);
  font-weight: var(--sb-fw-semibold);
}
.sb-dropdown__item small {
  font-size: var(--sb-text-xs);
  color: var(--sb-muted);
  font-weight: var(--sb-fw-regular);
}

.sb-dropdown__footer {
  border-top: 1px solid var(--sb-border);
  margin-top: var(--sb-space-2);
  padding-top: var(--sb-space-2);
}
.sb-dropdown__all-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sb-space-2);
  padding: var(--sb-space-2) var(--sb-space-5);
  font-size: var(--sb-text-sm);
  font-weight: var(--sb-fw-semibold);
  color: var(--sb-primary);
  text-decoration: none;
  transition: var(--sb-transition-fast);
}
.sb-dropdown__all-link:hover {
  gap: var(--sb-space-3);
}

/* ── Mega Courses Dropdown ── */
.sb-mega-courses {
  background:
    radial-gradient(circle at 92% 8%, rgba(62, 187, 158, 0.2), transparent 42%),
    radial-gradient(circle at 18% 100%, rgba(0, 103, 79, 0.08), transparent 48%),
    linear-gradient(180deg, #ffffff 0%, #f7fdfb 100%);
}

.sb-mega-courses__header {
  padding: 1.05rem 1.35rem;
  border-bottom: 1px solid rgba(0, 103, 79, 0.12);
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
}

.sb-mega-courses__header strong {
  font-size: 1rem;
  color: var(--sb-dark);
  font-weight: var(--sb-fw-extrabold);
  letter-spacing: -0.01em;
}

.sb-mega-courses__header span {
  font-size: 0.8rem;
  color: var(--sb-muted);
}

.sb-mega-courses__body {
  display: grid;
  grid-template-columns: 134px 220px 1fr;
  min-height: 410px;
}

.sb-mega-courses__levels {
  background: linear-gradient(180deg, #eff9f6 0%, #f7fcfb 100%);
  border-right: 1px solid rgba(0, 103, 79, 0.12);
  padding: 1rem 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.52rem;
}

.sb-mega-level {
  border: 1px solid rgba(0, 103, 79, 0.06);
  border-radius: 12px;
  padding: 0.65rem 0.75rem;
  text-align: left;
  font-size: 0.81rem;
  font-weight: var(--sb-fw-semibold);
  color: var(--sb-dark-2);
  background: rgba(255, 255, 255, 0.7);
  transition: var(--sb-transition-fast);
}

.sb-mega-level:hover {
  border-color: rgba(0, 103, 79, 0.25);
  background: rgba(62, 187, 158, 0.12);
}

.sb-mega-level.is-active {
  color: var(--sb-primary);
  border-color: rgba(0, 103, 79, 0.32);
  background: #ffffff;
  box-shadow: 0 10px 20px rgba(0, 103, 79, 0.14);
}

.sb-mega-courses__groups {
  border-right: 1px solid rgba(0, 103, 79, 0.12);
  padding: 1rem 0.85rem;
  background: #ffffff;
}

.sb-mega-group-list {
  display: none;
  flex-direction: column;
  gap: 0.55rem;
}

.sb-mega-group-list.is-active {
  display: flex;
}

.sb-mega-group-btn {
  width: 100%;
  border: 1px solid rgba(0, 103, 79, 0.08);
  border-radius: 12px;
  padding: 0.7rem 0.75rem;
  text-align: left;
  font-size: 0.82rem;
  font-weight: var(--sb-fw-semibold);
  color: var(--sb-dark-2);
  background: #fcfffe;
  transition: var(--sb-transition-fast);
}

.sb-mega-group-btn:hover {
  background: rgba(62, 187, 158, 0.1);
  border-color: rgba(0, 103, 79, 0.22);
}

.sb-mega-group-btn.is-active {
  color: var(--sb-primary);
  background: linear-gradient(180deg, #edf9f5 0%, #f6fcfa 100%);
  border-color: rgba(0, 103, 79, 0.28);
  box-shadow: 0 8px 18px rgba(0, 103, 79, 0.1);
}

.sb-mega-courses__content {
  padding: 1.05rem 1.1rem;
}

.sb-mega-panel {
  display: none;
}

.sb-mega-panel.is-active {
  display: block;
}

.sb-mega-panel__intro {
  margin-bottom: 1rem;
}

.sb-mega-panel__badge {
  display: inline-flex;
  align-items: center;
  padding: 0.27rem 0.58rem;
  border-radius: 9999px;
  background: rgba(0, 103, 79, 0.1);
  color: var(--sb-primary);
  font-size: 0.67rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: var(--sb-fw-bold);
  margin-bottom: 0.45rem;
}

.sb-mega-panel__intro h4 {
  font-size: 1.08rem;
  line-height: 1.2;
  margin-bottom: 0.4rem;
  font-weight: var(--sb-fw-bold);
}

.sb-mega-panel__intro p {
  margin: 0;
  color: var(--sb-muted);
  font-size: 0.82rem;
  line-height: 1.56;
  max-width: 98%;
}

.sb-mega-subjects {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0;
}

.sb-mega-subject {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(0, 103, 79, 0.15);
  border-radius: 9999px;
  padding: 0.46rem 0.82rem;
  background: #fff;
  color: var(--sb-dark-2);
  font-size: 0.77rem;
  font-weight: var(--sb-fw-semibold);
  text-decoration: none;
  line-height: 1.2;
  transition: var(--sb-transition-fast);
}

.sb-mega-subject:hover {
  border-color: rgba(0, 103, 79, 0.34);
  background: #f2fbf8;
  color: var(--sb-primary);
}

.sb-mega-subject.is-active {
  background: linear-gradient(120deg, var(--sb-primary) 0%, #0f886b 100%);
  border-color: transparent;
  color: var(--sb-white);
  box-shadow: 0 10px 22px rgba(0, 103, 79, 0.24);
}

/* ── Right Actions ── */
.sb-navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--sb-space-2);
  flex-shrink: 0;
  margin-left: auto;
}

.sb-navbar__action-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sb-space-1);
  padding: 0.5rem 0.75rem;
  font-size: var(--sb-text-sm);
  font-weight: var(--sb-fw-medium);
  color: var(--sb-dark-3);
  border-radius: var(--sb-radius-sm);
  text-decoration: none;
  transition: var(--sb-transition-fast);
  position: relative;
}
.sb-navbar__action-btn:hover {
  color: var(--sb-primary);
  background: var(--sb-primary-light);
}

.sb-navbar__action-label {
  font-size: var(--sb-text-xs);
  font-weight: var(--sb-fw-medium);
}

.sb-cart-count {
  position: absolute;
  top: 4px;
  right: 4px;
  min-width: 16px;
  height: 16px;
  background: var(--sb-secondary);
  color: var(--sb-dark);
  font-size: 10px;
  font-weight: var(--sb-fw-bold);
  border-radius: var(--sb-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 3px;
  line-height: 1;
}

/* ── Mobile Toggle ── */
.sb-navbar__toggle {
  display: none;
  padding: 0.5rem;
  border-radius: var(--sb-radius-sm);
  color: var(--sb-dark);
  transition: var(--sb-transition-fast);
}
.sb-navbar__toggle:hover {
  background: var(--sb-light);
}

/* Show / hide hamburger vs close icon */
.sb-navbar__toggle .sb-icon--menu {
  display: block;
}
.sb-navbar__toggle .sb-icon--close {
  display: none;
}
.sb-navbar__toggle[aria-expanded="true"] .sb-icon--menu {
  display: none;
}
.sb-navbar__toggle[aria-expanded="true"] .sb-icon--close {
  display: block;
}