/* =========================================================
   SBS College — Navbar / Header Styles
   ========================================================= */

/* =============================================
   HEADER WRAPPER
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: var(--white);
  box-shadow: 0 2px 20px rgba(26, 42, 108, 0.12);
  transition: all var(--transition-base);
}
.site-header.scrolled {
  box-shadow: 0 4px 30px rgba(26, 42, 108, 0.18);
}

/* =============================================
   MAIN NAV
   ============================================= */
.main-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 1.5rem;
}

/* --- Logo --- */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-shrink: 0;
  text-decoration: none;
}
.nav-logo img {
  width: 56px;
  height: 56px;
  object-fit: contain;
}
.nav-logo-text { line-height: 1.2; }
.nav-logo-text .college-name-main {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  display: block;
}
.nav-logo-text .college-name-sub {
  font-size: 0.72rem;
  color: var(--dark-gray);
  display: block;
}

/* --- Nav Links --- */
.nav-links {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 0;
}
.nav-item {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  height: 100%;
  padding: 0 0.8rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-dark);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: color var(--transition-fast);
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  right: 50%;
  height: 3px;
  background: var(--accent);
  transition: left var(--transition-base), right var(--transition-base);
  border-radius: var(--radius-full);
}
.nav-link:hover { color: var(--primary); }
.nav-link:hover::after,
.nav-item.active > .nav-link::after { left: 0.8rem; right: 0.8rem; }
.nav-link i.arrow { font-size: 0.65rem; transition: transform var(--transition-fast); }
.nav-item:hover > .nav-link i.arrow { transform: rotate(180deg); }

/* =============================================
   MEGA DROP-DOWN MENU
   ============================================= */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 200px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 40px rgba(26,42,108,0.18), 0 2px 10px rgba(26,42,108,0.1);
  border: 1px solid var(--light-gray);
  border-top: 3px solid var(--accent);
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all var(--transition-base);
  z-index: 100;
}
.nav-item:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* Mega menu for wide dropdowns */
.dropdown-menu.mega {
  width: 600px;
  left: 0;
  transform: translateY(8px);
  padding: 1.25rem;
}
.nav-item:hover .dropdown-menu.mega {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}
.mega-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}
.mega-section { padding: 0.5rem; }
.mega-section-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  padding: 0.4rem 0.8rem 0.6rem;
  border-bottom: 1px solid var(--light-gray);
  margin-bottom: 0.5rem;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  font-size: 0.83rem;
  color: var(--text-body);
  transition: all var(--transition-fast);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.dropdown-item i {
  width: 16px;
  color: var(--mid-gray);
  transition: color var(--transition-fast);
  font-size: 0.8rem;
}
.dropdown-item:hover {
  background: rgba(26,42,108,0.06);
  color: var(--primary);
  padding-left: 1.25rem;
}
.dropdown-item:hover i { color: var(--primary); }

/* Nested dropdown */
.dropdown-item.has-sub {
  position: relative;
  justify-content: space-between;
}
.dropdown-item.has-sub::after {
  content: '›';
  color: var(--mid-gray);
  font-size: 1rem;
}
.sub-dropdown {
  position: absolute;
  left: 100%;
  top: 0;
  min-width: 200px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 40px rgba(26,42,108,0.18);
  border: 1px solid var(--light-gray);
  border-top: 3px solid var(--primary);
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all var(--transition-base);
  z-index: 101;
}
.dropdown-item.has-sub:hover .sub-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* =============================================
   HAMBURGER / MOBILE TOGGLE
   ============================================= */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  z-index: 1001;
  background: transparent;
  border: none;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 2.5px;
  background: var(--primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* =============================================
   MOBILE NAV OVERLAY
   ============================================= */
@media (max-width: 1024px) {
  .nav-toggle { display: flex; }
  
  .nav-links {
    position: fixed;
    top: 0; right: 0;
    width: 320px;
    height: 100vh;
    background: var(--primary-dark);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 5rem 0 2rem;
    gap: 0;
    overflow-y: auto;
    transform: translateX(110%);
    transition: transform var(--transition-slow);
    z-index: 1000;
    box-shadow: -10px 0 40px rgba(0,0,0,0.3);
  }
  .nav-links.open { transform: translateX(0); }

  .nav-item {
    width: 100%;
    height: auto;
    flex-direction: column;
    align-items: flex-start;
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }
  .nav-link {
    color: rgba(255,255,255,0.9);
    height: auto;
    width: 100%;
    padding: 0.9rem 1.5rem;
    font-size: 0.9rem;
  }
  .nav-link::after { display: none; }
  .nav-link:hover { color: var(--accent-light); background: rgba(255,255,255,0.05); }

  .dropdown-menu {
    position: static;
    transform: none !important;
    width: 100%;
    background: rgba(255,255,255,0.05);
    border: none;
    border-top: 2px solid rgba(244,160,21,0.3);
    border-radius: 0;
    box-shadow: none;
    padding: 0.25rem 0;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    display: none;
  }
  .dropdown-menu.mega {
    display: none;
    width: 100%;
  }
  .nav-item.open .dropdown-menu { display: block; }
  .dropdown-item {
    color: rgba(255,255,255,0.75);
    padding-left: 2rem;
    white-space: normal;
  }
  .dropdown-item:hover { background: rgba(255,255,255,0.08); color: var(--accent-light); }
  .mega-grid { grid-template-columns: 1fr; }
  .mega-section-title { color: var(--accent-light); }
  .sub-dropdown { position: static; opacity: 1; visibility: visible; pointer-events: auto; transform: none; box-shadow: none; border: none; background: rgba(0,0,0,0.2); }
  
  .nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }
  .nav-overlay.open { opacity: 1; visibility: visible; }
}