.header-custom {
  background: linear-gradient(135deg, #333 0%, #1a1a1a 100%);
  padding: 15px 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  position: relative;
  width: 100%;
  z-index: 1000;
  transition: transform 0.3s ease; /* ترنزیشن فقط برای transform */
}

.header-hidden {
  transform: translateY(-100%);
}

/* بقیه استایل‌ها بدون تغییر */
.logo-img {
  max-height: 50px;
  margin-left: 10px;
  transition: transform 0.3s ease;
}

.navbar-brand:hover .logo-img {
  transform: scale(1.1);
}

.brand-text {
  font-size: 1.5rem;
  font-weight: bold;
  color: #fff;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
  transition: color 0.3s ease;
}

.navbar-brand:hover .brand-text {
  color: #007bff;
}

.navbar-nav .nav-link {
  font-size: 1rem;
  padding: 10px 15px;
  color: #fff;
  transition: color 0.3s ease, background-color 0.3s ease;
}

.navbar-nav .nav-link:hover {
  color: #007bff;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 5px;
}

.user-panel-btn {
  background-color: #007bff;
  padding: 8px 15px;
  border-radius: 20px;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

.user-panel-btn:hover {
  background-color: #0056b3;
  transform: scale(1.05);
}

.navbar-toggler {
  border: none;
  padding: 8px;
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

@media (max-width: 768px) {
  .header-custom {
    padding: 10px 0;
  }

  .navbar-brand {
    font-size: 1.2rem;
  }

  .logo-img {
    max-height: 40px;
  }

  .navbar-nav {
    text-align: center;
    margin-top: 10px;
  }

  .navbar-nav .nav-link {
    padding: 12px 0;
  }

  .user-panel-btn {
    margin: 10px auto;
    display: block;
    width: fit-content;
  }

  .navbar-collapse {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: 70%;
    background: rgba(51, 51, 51, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 20px;
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    box-shadow: -4px 0 10px rgba(0, 0, 0, 0.3);
    z-index: 2000;
  }

  .navbar-collapse.show {
    transform: translateX(0);
  }
}

@media (min-width: 769px) {
  .navbar-nav {
    gap: 10px;
  }
}