/* ============================================================
   Daneshgah AI – Custom Header Stylesheet v2
   RTL Persian | Desktop + Mobile | max-width: 1600px
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Vazirmatn:wght@300;400;500;600;700;800&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --dai-blue:        #2563EB;
  --dai-blue-dark:   #1D4ED8;
  --brand-shades-600: #1C4FBE;
  --dai-blue-light:  #EFF6FF;
  --dai-text:        #111827;
  --dai-text-muted:  #6B7280;
  --dai-border:      #E5E7EB;
  --dai-bg:          #FFFFFF;
  --dai-surface:     #F9FAFB;
  --dai-nutrals: #0D121C;
  --dai-header-h:    68px;
  --dai-mobile-h:    70px;
  --dai-radius:      10px;
  --dai-max-w:       1600px;           /* ← global max-width */
  --dai-px:          32px;             /* ← horizontal padding */
  --dai-shadow:      0 4px 24px rgba(0,0,0,.10);
  --dai-shadow-sm:   0 2px 8px rgba(0,0,0,.07);
  --dai-font:        'Vazirmatn', Tahoma, Arial, sans-serif;
  --dai-transition:  .22s cubic-bezier(.4,0,.2,1);
  --dai-mega-z:      9000;
  --dai-drawer-z:    9100;
  --dai-back-z:      8990;
}

/* ── Reset ─────────────────────────────────────────────────── */
.dai-header-wrapper *,
.dai-header-wrapper *::before,
.dai-header-wrapper *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.dai-header-wrapper {
  font-family: var(--dai-font);
  direction: rtl;
}

/* ── Max-width container (shared by header + mega inner) ───── */
.dai-constrained {
  max-width: var(--dai-max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--dai-px);
  padding-right: var(--dai-px);
}

/* ╔══════════════════════════════════════════════════════════╗
   ║                  DESKTOP HEADER                          ║
   ╚══════════════════════════════════════════════════════════╝ */
.dai-desktop-header {
  display: none;
  position: sticky;
  top: 0;
  z-index: 8900;
  background: var(--dai-bg);
  border-bottom: 1px solid var(--dai-border);
  box-shadow: var(--dai-shadow-sm);
}
@media (min-width: 1024px) {
  .dai-desktop-header { display: block; }
  .dai-mobile-header  { display: none !important; }
}

/* Inner bar: constrained + flex */
.dai-desktop-inner {
  display: flex;
  align-items: center;
  height: var(--dai-header-h);
  padding: 0 var(--dai-px);
  gap: 6px;
  max-width: var(--dai-max-w);
  margin: 0 auto;
  width: 100%;
}

/* ── Logo ──────────────────────────────────────────────────── */
.dai-logo-link {
  flex-shrink: 0;
  text-decoration: none;
  color: var(--dai-text);
  display: flex;
  align-items: center;
}

/* Image logo */
.dai-logo-img {
  display: block;
  max-height: 44px;
  width: auto;
  object-fit: contain;
}

/* Text fallback logo */
.dai-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.dai-logo-fa {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -.5px;
  color: var(--dai-text);
}
.dai-logo-en {
  font-size: .62rem;
  font-weight: 600;
  color: var(--dai-text-muted);
  letter-spacing: .5px;
  text-align: center;
}

/* ── Primary nav ───────────────────────────────────────────── */
.dai-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  justify-content: flex-start;
  flex-wrap: wrap;
  padding-right: 10rem;
}
.dai-nav-item {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--dai-font);
  font-size: .875rem;
  font-weight: 500;
  color: var(--dai-text);
  padding: 8px 10px;
  border-radius: 8px;
  transition: background var(--dai-transition), color var(--dai-transition);
  white-space: nowrap;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.dai-nav-item:hover,
.dai-nav-item[aria-expanded="true"] {
  background: var(--dai-blue-light);
  color: var(--dai-blue);
}
.dai-all-cats-btn {
  font-weight: 600;
}
.dai-all-cats-btn:hover,.dai-all-cats-btn:focus
.dai-all-cats-btn[aria-expanded="true"] {
  background: var(--dai-surface);
  border: 1px solid var(--dai-border);
}
.dai-icon-hamburger { width: 18px; height: 18px; }
.dai-nav-placeholder {
  font-size: .8rem;
  color: var(--dai-text-muted);
  padding: 0 8px;
  font-style: italic;
}

/* ── Desktop actions (search + auth) ──────────────────────── */
.dai-desktop-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: 8px;
  flex-shrink: 0;
}
.dai-search-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--dai-border);
  border-radius: 8px;
  padding: 7px 14px;
  font-family: var(--dai-font);
  font-size: .875rem;
  color: var(--dai-text-muted);
  cursor: pointer;
  transition: border-color var(--dai-transition), color var(--dai-transition);
  white-space: nowrap;
}
.dai-search-btn svg { width: 16px; height: 16px; }
.dai-search-btn:hover { 
  border-color: var(--dai-blue)!important;
  background-color: #fff!important;
  color: var(--dai-text-muted)!important;
   }

.dai-auth-btn {
  display: inline-flex;
  align-items: center;
  background: var(--brand-shades-600);
  color: #fff;
  font-family: var(--dai-font);
  font-size: .875rem;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: 10px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background var(--dai-transition), transform var(--dai-transition);
  white-space: nowrap;
}
.dai-auth-btn:hover{
  color: #fff!important;
}

/* ── Desktop search bar ────────────────────────────────────── */
.dai-desktop-search-bar {
  background: var(--dai-bg);
  border-top: 1px solid var(--dai-border);
  padding: 12px var(--dai-px);
  display: none;
}
.dai-desktop-search-bar.is-open { display: block; }
.dai-desktop-search-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 700px;
  margin: 0 auto;
}
.dai-desktop-search-inner form {
  flex: 1;
  display: flex;
  align-items: center;
  border: 1.5px solid var(--dai-border)!important;
  border-radius: 10px!important;
  overflow: hidden!important;
  transition: border-color var(--dai-transition)!important;
}
.dai-desktop-search-inner form:focus-within { border-color: var(--dai-blue); }

.dai-search-input {
  flex: 1;
  border: none!important;
  outline: none!important;
  padding: 10px 16px!important;
  font-family: var(--dai-font)!important;
  font-size: .9375rem!important;
  color: var(--dai-text)!important;
  background: transparent!important;
  direction: rtl!important;
  text-align: right!important;
}
.dai-search-input::placeholder { color: var(--dai-text-muted); }

.dai-search-submit {
  background: none!important;
  border: none!important;
  padding: 10px 14px!important;
  cursor: pointer!important;
  color: var(--dai-text-muted)!important;
  display: flex!important;
  align-items: center!important;
  transition: color var(--dai-transition)!important;
}
.dai-search-submit:hover { color: var(--dai-text-muted)!important; }
.dai-search-submit svg { width: 18px!important; height: 18px!important; }

.dai-search-close {
  background: none!important;
  border: 1px solid var(--dai-border)!important;
  border-radius: 8px!important;
  padding: 8px 12px!important;
  cursor: pointer!important;
  font-size: .875rem!important;
  color: var(--dai-text-muted)!important;
  transition: border-color var(--dai-transition), color var(--dai-transition)!important;
}
.dai-search-close:hover { color: var(--dai-text-muted)!important;background: none!important; }

/* ╔══════════════════════════════════════════════════════════╗
   ║                    MEGA MENU                             ║
   ╚══════════════════════════════════════════════════════════╝ */
.dai-mega-menu {
  position: fixed;
  /* JS sets --mega-right (in px from right viewport edge) — RTL safe */
  right: var(--mega-right, 0px);
  top: var(--mega-top, 68px);
  background: var(--dai-bg);
  border-bottom: 1px solid var(--dai-border);
  box-shadow: var(--dai-shadow);
  z-index: var(--dai-mega-z);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  border-radius: 8px!important;
  transition: opacity var(--dai-transition), transform var(--dai-transition);
  /* prevent overflow off the left edge of the screen */
  max-width: calc(100vw - var(--mega-right, 0px) - 8px);
}
.dai-mega-menu.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* Wrap constrains to 1600px, centred */
.dai-mega-wrap {
  max-width: var(--dai-max-w);
  margin: 0 auto;
  border-radius: 8px!important;
}

/* Main mega layout: right=categories, left=sub-items */
.dai-mega-inner {
  display: flex;
  flex-direction: row-reverse; /* RTL: right panel first */
  min-height: 380px;
  border-radius: 8px!important;
}
.dai-mega-inner--flat {
  min-height: auto;
  padding: 20px 0;
}

/* Right panel — main categories */
.dai-mega-main-panel {
  width: 300px;
  flex-shrink: 0;
  border-left: 1px solid var(--dai-border);
  padding: 12px 0;
  background: #FFFFFF!important;
  border-radius: 0 8px 8px 0;
}
.dai-mega-main-list { list-style: none;padding: 6px; }
.dai-mega-main-btn {
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--dai-font);
  font-size: .9rem;
  font-weight: 500;
  color: var(--dai-text);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  text-align: right;
  transition: background var(--dai-transition), color var(--dai-transition);
}
.dai-mega-main-btn:hover,
.dai-mega-main-item.is-active .dai-mega-main-btn {
  background: var(--dai-surface)!important;
  color: var(--dai-nutrals)!important;
  border-radius: 12px!important;
}
.dai-mega-main-icon { width: 22px; height: 22px; flex-shrink: 0; color: var(--dai-blue); }
.dai-mega-main-icon svg { width: 22px; height: 22px; }
.dai-mega-main-label { flex: 1; display: flex; align-items: center; gap: 8px; }
.dai-mega-arrow { color: var(--dai-text-muted); font-size: 1rem; }
.dai-mega-empty {
  padding: 24px 20px;
  font-size: .85rem;
  color: var(--dai-text-muted);
  line-height: 1.7;
}

/* Left panel — sub items */
.dai-mega-sub-panel {
  flex: 1;
  padding: 20px 24px;
  overflow-y: auto;
  min-width: 27rem;
}
.dai-mega-sub-list { list-style: none; }
.dai-mega-sub-item {
  border-bottom: 1px solid var(--dai-border);
  position: relative; /* anchor for nested dropdown */
}
.dai-mega-sub-item:last-child { border-bottom: none; }
.dai-mega-sub-link {
  display: flex;
  flex-direction: row-reverse;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 13px 4px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--dai-text);
  text-decoration: none;
  transition: color var(--dai-transition);
}
.dai-mega-sub-link:hover { color: var(--dai-blue); }

/* ── Sub-sub dropdown (items that have their own children) ── */
.dai-mega-sub-item--has-children > .dai-mega-sub-link {
  cursor: pointer;
  user-select: none;
}
/* small caret on the left (RTL) side of the link */
.dai-mega-sub-item--has-children.is-open > .dai-mega-sub-link::after {
  transform: rotate(135deg);
}

/* The nested dropdown list */
.dai-mega-sub-children {
  list-style: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s cubic-bezier(.4,0,.2,1);
  background: var(--dai-surface);
  border-radius: 6px;
  margin: 0 0 4px 0;
}
.dai-mega-sub-item--has-children.is-open .dai-mega-sub-children {
  max-height: 600px; /* large enough for any practical list */
}
.dai-mega-sub-child-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  font-size: .85rem;
  font-weight: 400;
  color: var(--dai-text);
  text-decoration: none;
  border-bottom: 1px solid var(--dai-border);
  transition: background var(--dai-transition), color var(--dai-transition);
}
.dai-mega-sub-child-link:last-child { border-bottom: none; }
.dai-mega-sub-child-link:hover {
  background: var(--dai-blue-light);
  color: var(--dai-blue);
}

.dai-mega-sub-placeholder {
  color: var(--dai-text-muted);
  font-size: .875rem;
  padding: 24px 4px;
}

/* Per-nav-item flat dropdown */
.dai-mega-nav-item .dai-mega-inner--flat { display: block; }
.dai-mega-flat-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0;
  list-style: none;
}

/* ── Sub-sub children inside the flat per-nav-item dropdown ── */
.dai-flat-sub-item {
  position: relative;
}
.dai-flat-sub-item--has-children > .dai-mega-sub-link {
  cursor: pointer;
}
.dai-flat-sub-item--has-children > .dai-mega-sub-link::after {
  content: '';
  display: inline-block;
  width: 7px;
  height: 7px;
  border-left: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  flex-shrink: 0;
  transition: transform var(--dai-transition);
}
.dai-flat-sub-item--has-children.is-open > .dai-mega-sub-link::after {
  transform: rotate(135deg);
}
.dai-flat-sub-children {
  list-style: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s cubic-bezier(.4,0,.2,1);
  background: var(--dai-surface);
  border-radius: 6px;
  margin: 0 4px 4px;
}
.dai-flat-sub-item--has-children.is-open .dai-flat-sub-children {
  max-height: 600px;
}
.dai-flat-sub-child-link {
  display: flex;
  align-items: center;
  padding: 9px 16px;
  font-size: .82rem;
  color: var(--dai-text);
  text-decoration: none;
  border-bottom: 1px solid var(--dai-border);
  transition: background var(--dai-transition), color var(--dai-transition);
}
.dai-flat-sub-child-link:last-child { border-bottom: none; }
.dai-flat-sub-child-link:hover {
  background: var(--dai-blue-light);
  color: var(--dai-blue);
}

/* Badge */
.dai-badge {
  display: inline-flex;
  align-items: center;
  background: var(--dai-text);
  color: #fff;
  font-size: .6rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 999px;
  letter-spacing: .3px;
}

/* Backdrop */
.dai-mega-backdrop {
  position: fixed;
  inset: 0;
  top: var(--dai-header-h);
  background: rgba(0,0,0,.3);
  z-index: var(--dai-back-z);
  display: none;
  backdrop-filter: blur(2px);
}
.dai-mega-backdrop.is-visible { display: block; }

/* ╔══════════════════════════════════════════════════════════╗
   ║                  MOBILE HEADER                           ║
   ╚══════════════════════════════════════════════════════════╝ */
.dai-mobile-header {
  display: block;
  position: sticky;
  top: 0;
  z-index: 8900;
  background: var(--dai-bg);
  border-bottom: 1px solid var(--dai-border);
  box-shadow: var(--dai-shadow-sm);
}
@media (min-width: 1024px) {
  .dai-mobile-header { display: none; }
}
.dai-mobile-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--dai-mobile-h);
  padding: 0 16px;
  gap: 10px;
}
.dai-mobile-inner .dai-logo-img { max-height: 36px; }

.dai-mobile-menu-btn {
  background: none;
  border: 1.5px solid var(--dai-border);
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
  color: var(--dai-text);
  display: flex;
  align-items: center;
  flex-shrink: 0;
  transition: border-color var(--dai-transition), color var(--dai-transition);
}
.dai-mobile-menu-btn svg { width: 22px; height: 22px; }
.dai-mobile-menu-btn:hover,.dai-mobile-menu-btn:focus { border-color: var(--dai-blue); color: var(--dai-blue); }

/* ╔══════════════════════════════════════════════════════════╗
   ║                  MOBILE DRAWER                           ║
   ╚══════════════════════════════════════════════════════════╝ */
.dai-mobile-drawer {
  position: fixed;
  top: 0; bottom: 0;
  right: 0; left: auto;
  width: 100%;
  max-width: 420px;
  background: var(--dai-bg);
  z-index: var(--dai-drawer-z);
  transform: translateX(110%);
  transition: transform .3s cubic-bezier(.4,0,.2,1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
@media (min-width: 1024px) { .dai-mobile-drawer { display: none; } }
.dai-mobile-drawer.is-open { transform: translateX(0); }

/* Drawer header */
.dai-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--dai-border);
  gap: 10px;
  flex-shrink: 0;
}
.dai-drawer-header .dai-logo-img { max-height: 36px; }
.dai-drawer-close {
  background: none;
  border: 1.5px solid var(--dai-border);
  border-radius: 10px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--dai-text);
  flex-shrink: 0;
  transition: border-color var(--dai-transition), color var(--dai-transition);
}
.dai-drawer-close:hover { border-color: var(--dai-blue); color: var(--dai-blue); }

/* Drawer search */
.dai-drawer-search { padding: 16px; flex-shrink: 0; }
.dai-drawer-search form {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--dai-border);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color var(--dai-transition);
}
.dai-drawer-search form:focus-within { border-color: var(--dai-blue); }
.dai-drawer-divider {
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    var(--dai-border) 0, var(--dai-border) 8px,
    transparent 8px, transparent 14px
  );
  margin: 0 16px;
  flex-shrink: 0;
}

/* Drawer panels */
.dai-drawer-panels { flex: 1; overflow: hidden; position: relative; }
.dai-drawer-panel {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform .28s cubic-bezier(.4,0,.2,1);
  padding: 4px 0;
}
.dai-drawer-panel--active { transform: translateX(0); }

/* Drawer list & buttons */
.dai-drawer-list { list-style: none; }
.dai-drawer-item { display: block; }
.dai-drawer-btn {
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--dai-font);
  font-size: 1rem;
  font-weight: 500;
  color: var(--dai-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 20px;
  text-align: right;
  text-decoration: none;
  border-bottom: 1px solid var(--dai-border);
  transition: background var(--dai-transition), color var(--dai-transition);
}
.dai-drawer-btn:hover { background: var(--dai-blue-light); color: var(--dai-blue); }
.dai-drawer-item-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.dai-drawer-icon { width: 24px; height: 24px; color: var(--dai-blue); flex-shrink: 0; }
.dai-drawer-icon svg { width: 24px; height: 24px; }
.dai-drawer-chevron { color: var(--dai-text-muted); font-size: 1rem; flex-shrink: 0; }

/* Sub-title inside sub-panel */
.dai-drawer-sub-title {
  padding: 12px 20px 8px;
  font-size: .8rem;
  font-weight: 700;
  color: var(--dai-blue);
  letter-spacing: .2px;
  border-bottom: 2px solid var(--dai-blue-light);
}

/* Back button */
.dai-drawer-back {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  border-bottom: 1px solid var(--dai-border);
  width: 100%;
  padding: 14px 20px;
  font-family: var(--dai-font);
  font-size: .9rem;
  font-weight: 600;
  color: var(--dai-blue);
  cursor: pointer;
  justify-content: flex-end;
}
.dai-drawer-back:focus{
  background: none!important;
}
.dai-drawer-back span { font-size: 1.2rem; }

/* ── Focus ─────────────────────────────────────────────────── */
.dai-header-wrapper *:focus-visible {
  outline: 2px solid var(--dai-blue);
  outline-offset: 2px;
}



button.dai-mega-sub-link {
    display: flex;
    justify-content: space-between;
    padding-inline: 0;
    color: var(--dai-text)!important;
}
button.dai-mega-sub-link:hover,button.dai-mega-sub-link:focus{
  color: var(--dai-text)!important;
}