:root {
    --primary-color: #1e293b;
    --accent-color: #d63638;
    --text-color: #334155;
    --header-bg: #ffffff;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-header {
    background: var(--header-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo a {
    font-size: 24px;
    font-weight: 800;
    text-decoration: none;
    color: var(--primary-color);
    text-transform: uppercase;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--accent-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle .bar {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .menu-container {
        position: fixed;
        top: 0;
        bottom: 0;
        width: 280px;
        background: #fff;
        z-index: 1001;
        padding: 40px 20px;
        transition: transform 0.4s ease-in-out;
        box-shadow: 0 0 15px rgba(0,0,0,0.2);
    }

    body.rtl .menu-container {
        right: 0;
        transform: translateX(100%);
    }
    
    body:not(.rtl) .menu-container {
        left: 0;
        transform: translateX(-100%);
    }

    .main-navigation.is-active .menu-container {
        transform: translateX(0);
    }

    .nav-menu {
        flex-direction: column;
        gap: 20px;
    }

    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        display: none;
        z-index: 1000;
    }

    .main-navigation.is-active .nav-overlay {
        display: block;
    }

    .menu-close {
        position: absolute;
        top: 15px;
        font-size: 30px;
        background: none;
        border: none;
        cursor: pointer;
    }

    body.rtl .menu-close { left: 15px; }
    body:not(.rtl) .menu-close { right: 15px; }
}