/* nav bar start  */
.navbar {
    background: #ffffff;
    padding: 1rem 2rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    font-family: Arial, sans-serif;
}

.navbar .nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.navbar .logo {
    width: 40px;
    height: 40px;
}

.navbar .brand-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2c3e50;
    text-decoration: none;
}

.navbar .nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.navbar .nav-link {
    font-family: Arial, sans-serif;
    color: #2c3e50;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.navbar  .nav-link:hover, .nav-link.active {
    color: #4CAF50;
}

.navbar  .dropdown {
    position: relative;
}

.navbar  .dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border-radius: 5px;
    padding: 0.5rem 0;
    min-width: 150px;
    display: none;
    list-style: none;
}

.navbar .dropdown:hover .dropdown-menu {
    display: block;
}

.navbar .dropdown-menu a {
    color: #2c3e50;
    padding: 0.5rem 1rem;
    display: block;
    text-decoration: none;
    transition: background 0.3s ease;
}

.navbar .dropdown-menu a:hover {
    background: #f8f9fa;
    color: #4CAF50;
}

.navbar .hamburger {
    display: none;
    cursor: pointer;
}

.navbar .bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background: #2c3e50;
    transition: all 0.3s ease;
}

@media screen and (max-width: 768px) {
    .navbar .hamburger {
        display: block;
    }

    .navbar .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .navbar .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .navbar .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .navbar .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        gap: 0;
        flex-direction: column;
        background: #ffffff;
        width: 100%;
        padding: 1rem 0;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }

    .navbar .nav-menu.active {
        left: 0;
    }

    .navbar .nav-item {
        margin: 16px 0;
    }

    .navbar .dropdown-menu {
        position: static;
        display: none;
        box-shadow: none;
        padding: 0;
    }

    .navbar .dropdown.active .dropdown-menu {
        display: block;
    }
}