/* ==========================================================================
   Component — Site Navigation
   mega PDF: پنل + backdrop | ترجمه: Bootstrap dropdown
   ========================================================================== */

/* ── لینک‌های navbar ── */
.site-nav__primary .nav-link,
.site-nav__pdf-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-align: start;
  border: none;
  background: transparent;
  width: auto;
}

.site-nav__label {
  flex: 0 1 auto;
}

.site-nav__icon {
  flex-shrink: 0;
  opacity: 0.9;
  font-size: 1rem;
  line-height: 1;
}

.site-nav__expand-icon {
  flex-shrink: 0;
  font-size: 0.85rem;
  opacity: 0.65;
  margin-inline-start: auto;
  transition: transform var(--duration-base) var(--ease-standard);
}

.site-nav__pdf-toggle--mobile[aria-expanded="true"] .site-nav__expand-icon {
  transform: rotate(180deg);
}

.site-nav__primary .dropdown-toggle::after {
  margin-inline-start: var(--space-1);
  margin-inline-end: 0;
}

/* ── Dropdown ابزارهای هوش مصنوعی ── */
.site-nav__dropdown-menu {
  min-width: 14rem;
  padding: var(--space-2);
}

.site-nav__ai-tools > .dropdown-toggle {
  font-weight: var(--font-weight-semibold);
}

.site-nav__ai-tools > .dropdown-toggle .site-nav__icon {
  color: var(--color-primary);
  opacity: 1;
}

.site-nav__dropdown-link--all {
  font-weight: var(--font-weight-semibold);
}

.site-nav__dropdown-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-align: start;
  border-radius: var(--radius-sm);
  padding-block: var(--space-2);
}

.site-nav__dropdown-link i {
  flex-shrink: 0;
  color: var(--color-primary);
  font-size: 1.05em;
}

.site-nav__dropdown-link.active {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

/* ── Backdrop (دسکتاپ) ── */
.site-mega-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--site-header-offset, var(--header-height));
  z-index: calc(var(--z-sticky) - 1);
  background-color: rgb(15 23 42 / 0.48);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  cursor: pointer;
}

@supports not (backdrop-filter: blur(1px)) {
  .site-mega-backdrop {
    background-color: rgb(15 23 42 / 0.62);
  }
}

.site-mega-backdrop.is-visible {
  display: block;
}

@media (prefers-reduced-motion: reduce) {
  .site-mega-backdrop {
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
}

@media (max-width: 991.98px) {
  .site-mega-backdrop {
    display: none !important;
  }
}

/* ── Mega panel (دسکتاپ) ── */
.site-mega-panel {
  display: none;
  position: fixed;
  top: var(--site-header-offset, var(--header-height));
  left: 0;
  right: 0;
  z-index: calc(var(--z-sticky) + 1);
  background-color: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow-xl);
  padding: var(--space-5) var(--container-pad);
  max-height: calc(100vh - var(--site-header-offset, var(--header-height)));
  max-height: calc(100dvh - var(--site-header-offset, var(--header-height)));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.site-mega-panel.is-open {
  display: block;
}

@media (max-width: 991.98px) {
  .site-mega-panel {
    display: none !important;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .site-mega-backdrop.is-visible {
    animation: site-mega-fade-in var(--duration-base) var(--ease-out);
  }

  .site-mega-panel.is-open {
    animation: site-mega-slide-in var(--duration-base) var(--ease-out);
  }
}

@keyframes site-mega-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes site-mega-slide-in {
  from {
    opacity: 0;
    transform: translateY(-0.35rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.site-header--mega-open .navbar {
  border-bottom-color: transparent;
}

.site-mega-panel__inner {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
}

.site-mega-panel__hub-link-wrap {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.site-mega-panel__hub-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: rgb(220 38 38 / 0.06);
  border: 1px solid rgb(220 38 38 / 0.15);
  color: #b91c1c;
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) var(--ease-standard);
}

.site-mega-panel__hub-link:hover,
.site-mega-panel__hub-link:focus {
  background: rgb(220 38 38 / 0.1);
  border-color: rgb(220 38 38 / 0.28);
  color: #991b1b;
}

.site-mega-panel__hub-link.is-active {
  background: rgb(220 38 38 / 0.12);
  border-color: rgb(220 38 38 / 0.35);
}

/* ۴ ستون یکنواخت از lg — بدون grid ۲×۲ که فاصله وسط می‌سازد */
.site-mega-panel__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
  width: 100%;
}

.site-mega-panel__col {
  min-width: 0;
}

.site-mega-panel__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.site-mega-panel__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-tight);
  transition: background-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}

.site-mega-panel__link span {
  min-width: 0;
}

.site-mega-panel__link:hover,
.site-mega-panel__link:focus {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

.site-mega-panel__link.is-active {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.site-mega-panel__link i {
  flex-shrink: 0;
  color: var(--color-primary);
  font-size: 1.1em;
}

.site-mega-panel__note {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-align: center;
}

.site-mega-panel__note .bi {
  color: var(--color-success);
  flex-shrink: 0;
}

.site-nav__pdf-toggle.is-open,
.site-nav__pdf-toggle--desktop.is-open {
  color: var(--color-primary) !important;
  background-color: var(--color-primary-soft);
}

/* دسکتاپ باریک: همان ۴ ستون با فشردگی بیشتر (نه ۲×۲) */
@media (min-width: 992px) and (max-width: 1199.98px) {
  .site-mega-panel {
    padding-block: var(--space-4);
  }

  .site-mega-panel__grid {
    gap: var(--space-3);
  }

  .site-mega-panel__link {
    font-size: var(--font-size-xs);
    padding: var(--space-1) var(--space-2);
    gap: var(--space-1);
  }

  .site-mega-panel__link i {
    font-size: 1em;
  }
}


/* ── پس‌زمینهٔ تیرهٔ منوی موبایل (off-canvas) ── */
.site-nav-backdrop {
  display: none;
  position: fixed;
  inset-inline: 0;
  top: var(--site-header-offset, var(--header-height));
  bottom: 0;
  z-index: calc(var(--z-modal) - 1);
  background-color: rgb(15 23 42 / 0.48);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  cursor: pointer;
  touch-action: none;
}

.site-nav-backdrop.is-visible {
  display: block;
}

@media (prefers-reduced-motion: no-preference) {
  .site-nav-backdrop.is-visible {
    animation: site-mega-fade-in var(--duration-base) var(--ease-out);
  }
}

@media (min-width: 992px) {
  .site-nav-backdrop {
    display: none !important;
  }
}

/* ── موبایل / منوی کشویی (off-canvas) از راست ── */
@media (max-width: 991.98px) {
  body.site-nav-open .site-header {
    z-index: calc(var(--z-modal) + 2);
  }

  .site-header .navbar > .container-fluid {
    flex-wrap: nowrap;
    align-items: center;
  }

  #siteNavCollapse {
    display: block !important;
    position: fixed;
    inset-inline-start: 0;
    top: var(--site-header-offset, var(--header-height));
    width: min(85vw, 22rem);
    height: calc(100dvh - var(--site-header-offset, var(--header-height)));
    max-height: calc(100dvh - var(--site-header-offset, var(--header-height)));
    margin: 0;
    padding: var(--space-4) var(--container-pad) var(--space-5);
    border-top: none;
    border-inline-end: 1px solid var(--color-border);
    background-color: var(--color-bg-elevated);
    box-shadow: var(--shadow-xl);
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
    z-index: var(--z-modal);
    transform: translateX(100%);
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--duration-base) var(--ease-standard),
                visibility 0s linear var(--duration-base);
  }

  #siteNavCollapse.show {
    transform: translateX(0);
    visibility: visible;
    pointer-events: auto;
    transition: transform var(--duration-base) var(--ease-standard);
  }

  @media (prefers-reduced-motion: reduce) {
    #siteNavCollapse {
      transition: none;
    }
  }

  #siteNavCollapse > .navbar-nav {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav__primary {
    width: 100%;
    flex-direction: column;
    flex-grow: 0 !important;
    gap: var(--space-1);
  }

  .site-nav__primary > .nav-item {
    width: 100%;
  }

  .site-nav__primary .nav-link,
  .site-nav__pdf-toggle {
    width: 100%;
    justify-content: flex-start;
    padding-block: var(--space-3) !important;
    padding-inline: var(--space-3) !important;
    border-radius: var(--radius-md);
  }

  .site-nav__pdf-tools {
    width: 100%;
  }

  .site-nav__mobile-mega {
    width: 100%;
  }

  .site-nav__mobile-mega-inner {
    background-color: var(--color-bg-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    margin-top: var(--space-1);
  }

  .site-nav__mobile-mega-inner .site-mega-panel__grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .site-nav__mobile-mega-inner .site-mega-panel__col + .site-mega-panel__col {
    padding-top: var(--space-2);
    border-top: 1px dashed var(--color-border);
  }

  .site-nav__mobile-mega-inner .site-mega-panel__note {
    margin-top: var(--space-3);
    padding-top: var(--space-3);
  }

  .site-nav__primary .dropdown-menu {
    position: static !important;
    transform: none !important;
    float: none;
    width: 100%;
    margin-top: var(--space-1);
    box-shadow: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg-muted);
  }

  .site-nav__account {
    width: 100%;
    margin-top: var(--space-2);
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch !important;
  }

  .site-nav__account .nav-link,
  .site-nav__account .btn {
    width: 100%;
    justify-content: flex-start;
    text-align: start;
  }

  .site-nav__account .dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-align: start;
  }

  .site-nav__account .dropdown-item .bi {
    margin-inline-start: 0 !important;
    margin-inline-end: 0 !important;
  }
}

@media (min-width: 992px) {
  #siteNavCollapse {
    display: flex !important;
    flex-wrap: wrap;
    align-items: center;
    overflow: visible;
  }

  .site-nav__primary {
    display: flex;
    align-items: center;
    gap: var(--space-2);
  }

  .site-nav__primary > .nav-item {
    margin: 0;
  }

  .site-nav__primary > .nav-item > .nav-link,
  .site-nav__primary .site-nav__pdf-toggle--desktop {
    font-size: var(--font-size-sm);
    padding-inline: var(--space-3) !important;
    padding-block: var(--space-2) !important;
  }

  .site-nav__primary .dropdown-toggle::after {
    margin-inline-start: var(--space-2);
  }
}