/* CalcSolver - Navigation Styles */

/* Navigation Menu */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 0;
    list-style: none;
    margin: 0;
    margin-left: auto;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-item > a {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 16px;
    height: 60px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.nav-item > a:hover {
    color: var(--btn-operator-bg);
}

.nav-item > a .dropdown-arrow {
    font-size: 0.7rem;
    transition: transform var(--transition-fast);
}

.nav-item:hover > a .dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 240px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 40px var(--shadow-color);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
    z-index: 1000;
    padding: 8px 0;
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    list-style: none;
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background var(--transition-fast);
}

.dropdown-menu a:hover {
    background: var(--bg-tertiary);
    color: var(--btn-operator-bg);
}

.dropdown-menu .dropdown-icon {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

.dropdown-menu .dropdown-all {
    font-weight: 600;
    color: var(--btn-operator-bg);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 4px;
    padding-bottom: 12px;
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    font-size: 1.5rem;
    color: var(--text-primary);
}

/* Responsive Navigation */
@media (max-width: 1024px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        background: var(--bg-secondary);
        padding: 20px;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        overflow-y: auto;
        z-index: 999;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-item {
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-item > a {
        justify-content: space-between;
        padding: 16px 0;
        height: auto;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        padding: 0 0 10px 20px;
        display: none;
    }

    .nav-item.open .dropdown-menu {
        display: block;
    }
}

@media (max-width: 768px) {
    .nav-item > a {
        font-size: 0.9rem;
        padding: 0 12px;
    }
}