.header-nav {
    position: relative;
    direction: rtl;
}

.header-nav .nav-menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.header-nav .nav-menu li {
    margin: 0;
}

.header-nav .nav-menu a {
    color: #374151;
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 0.5rem 0;
    display: block;
    position: relative;
}

.header-nav .nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.2s;
}

.header-nav .nav-menu a:hover::after,
.header-nav .nav-menu .current-menu-item > a::after {
    width: 100%;
}

.header-nav .nav-menu .current-menu-item > a {
    color: #2563eb;
}

.header-nav .nav-menu .sub-menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

@media (max-width: 767px) {
    .header-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        height: 100dvh;
        background: #ffffff;
        box-shadow: -2px 0 16px rgba(0, 0, 0, 0.15);
        z-index: 9999;
        transition: right 0.3s ease;
        overflow-y: auto;
        padding: 0;
    }
    
    .header-nav.active {
        right: 0;
    }
    
    .header-nav .nav-menu {
        display: block;
        list-style: none;
        margin: 0;
        padding: 1rem 0;
    }
    
    .header-nav .nav-menu li {
        margin: 0;
        border-bottom: 1px solid #f3f4f6;
    }
    
    .header-nav .nav-menu li:last-child {
        border-bottom: none;
    }
    
    .header-nav .nav-menu > li > a {
        display: block;
        padding: 1rem 1.25rem;
        font-size: 0.9375rem;
        font-weight: 500;
        color: #374151;
        text-decoration: none;
        transition: all 0.2s;
    }
    
    .header-nav .nav-menu > li > a::after {
        display: none;
    }
    
    .header-nav .nav-menu > li > a:active {
        background: #f9fafb;
        color: #6366f1;
    }
    
    .header-nav .nav-menu .current-menu-item > a {
        background: #f0f4ff;
        color: #6366f1;
        font-weight: 600;
    }
    
    .header-nav .nav-menu .sub-menu {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        background: #f9fafb;
        list-style: none;
        margin: 0;
        padding: 0;
    }
    
    .header-nav .nav-menu .menu-item-has-children > a {
        position: relative;
        padding-right: 2.5rem;
    }
    
    .header-nav .nav-menu .menu-item-has-children > a::before {
        content: '›';
        position: absolute;
        right: 1.25rem;
        top: 50%;
        transform: translateY(-50%);
        font-size: 1.25rem;
        color: #9ca3af;
        transition: transform 0.3s ease;
    }
    
    .header-nav .nav-menu .menu-item-has-children.open > a::before {
        transform: translateY(-50%) rotate(90deg);
    }
    
    .header-nav .nav-menu .menu-item-has-children.open > .sub-menu {
        max-height: 2000px;
    }
    
    .header-nav .nav-menu .sub-menu a {
        display: block;
        padding: 0.75rem 1.25rem 0.75rem 2.5rem;
        font-size: 0.875rem;
        color: #6b7280;
        text-decoration: none;
    }
    
    .header-nav .nav-menu .sub-menu a:active {
        background: #f3f4f6;
        color: #6366f1;
    }
    
    .header-nav .nav-menu .sub-menu .current-menu-item > a {
        color: #6366f1;
        font-weight: 600;
    }
    
    body.menu-open {
        overflow: hidden;
    }
    
    body.menu-open::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 9998;
    }
}

@media (min-width: 768px) {
    .header-nav {
        display: block;
    }
    
    .header-nav .nav-menu {
        display: flex;
        gap: 2rem;
        align-items: center;
    }
    
    .header-nav .nav-menu .sub-menu {
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 200px;
        background: #ffffff;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        border-radius: 8px;
        padding: 0.5rem 0;
        margin-top: 0.5rem;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
    }
    
    .header-nav .nav-menu .menu-item-has-children {
        position: relative;
    }
    
    .header-nav .nav-menu .menu-item-has-children:hover > .sub-menu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .header-nav .nav-menu .sub-menu li {
        border-bottom: none;
    }
    
    .header-nav .nav-menu .sub-menu a {
        padding: 0.75rem 1.5rem;
        font-size: 0.875rem;
    }
    
    .header-nav .nav-menu .sub-menu .sub-menu {
        left: 100%;
        top: 0;
        margin-top: 0;
        margin-left: 0.5rem;
    }
}