.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: var(--transition);
}

.navbar {
  background: #ffffff !important;
  border-bottom: 1px solid var(--gray-200);
  transition: var(--transition);
}

.header.scrolled .navbar {
  box-shadow: var(--shadow-md);
  padding-top: 8px !important;
  padding-bottom: 8px !important;
}

.logo {
  transition: var(--transition);
}

.logo:hover {
  transform: scale(1.02);
}

.nav-link {
  position: relative;
  transition: var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  transform: translateX(-50%);
  transition: width 0.3s ease;
  border-radius: 2px;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: calc(100% - 24px);
}

.nav-link.active {
  color: var(--primary) !important;
}

 
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--gray-500);
  background: var(--gray-50);
  border-radius: 50%;
  transition: var(--transition);
}

.social-link:hover {
  color: var(--white);
  background: var(--primary);
  transform: translateY(-3px);
}

 
.user-avatar-small {
  transition: var(--transition);
}

.btn-primary {
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(15, 124, 157, 0.2);
}

 
@media (max-width: 991.98px) {
  .navbar-collapse {
    background: #ffffff;
    max-height: 80vh;
    overflow-y: auto;
    padding: 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin-top: 10px;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link {
    padding: 12px 20px !important;
    border-radius: var(--radius-sm);
  }

  .nav-link:hover, .nav-link.active {
    background: var(--gray-50);
  }
}

@media (max-width: 575.98px) {
  .logo img {
    width: 130px !important;
  }
}