/* Mega-Menu Styles - Enhanced Navigation Structure */

/* Mega-Menu Container */
.mega-menu {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 2rem;
    background: var(--md-default-bg-color);
    border-radius: 0.75rem;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    border: 1px solid var(--md-default-fg-color--lightest);
    max-width: 1200px;
    margin: 1rem auto;
    position: relative;
    overflow: hidden;
}

.mega-menu::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--md-accent-fg-color) 0%, var(--md-accent-fg-color--dark) 100%);
}

/* Mega-Menu Column */
.mega-menu-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mega-menu-column h3 {
    margin: 0 0 1rem 0;
    color: var(--md-accent-fg-color);
    font-size: 1.1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--md-accent-fg-color--transparent);
}

.mega-menu-column h3::before {
    content: "📚";
    font-size: 1.2rem;
}

/* Mega-Menu Links */
.mega-menu-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mega-menu-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--md-default-fg-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.mega-menu-link:hover {
    background: var(--md-accent-fg-color--transparent);
    transform: translateX(4px);
}

.mega-menu-link::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent 0%, var(--md-accent-fg-color--transparent) 100%);
    transition: left 0.3s ease;
}

.mega-menu-link:hover::before {
    left: 0;
}

.mega-menu-icon {
    width: 32px;
    height: 32px;
    background: var(--md-accent-fg-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-accent-bg-color);
    font-size: 1rem;
    flex-shrink: 0;
}

.mega-menu-content {
    flex: 1;
}

.mega-menu-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--md-default-fg-color);
}

.mega-menu-description {
    font-size: 0.8rem;
    color: var(--md-default-fg-color--light);
    line-height: 1.4;
}

/* Mega-Menu Featured Items */
.mega-menu-featured {
    background: linear-gradient(135deg, var(--md-accent-fg-color--transparent) 0%, transparent 100%);
    border: 1px solid var(--md-accent-fg-color--transparent);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-top: 1rem;
}

.mega-menu-featured h4 {
    margin: 0 0 0.75rem 0;
    color: var(--md-accent-fg-color);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.mega-menu-featured h4::before {
    content: "⭐";
    font-size: 1rem;
}

/* Mega-Menu Quick Actions */
.mega-menu-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--md-default-fg-color--lightest);
}

.mega-menu-action {
    background: var(--md-accent-fg-color);
    color: var(--md-accent-bg-color);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.mega-menu-action:hover {
    background: var(--md-accent-fg-color--dark);
    transform: translateY(-2px);
}

.mega-menu-action.secondary {
    background: var(--md-default-fg-color--light);
    color: var(--md-default-fg-color);
}

.mega-menu-action.secondary:hover {
    background: var(--md-default-fg-color--lightest);
}

/* Mega-Menu Stats */
.mega-menu-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
    padding: 1rem;
    background: var(--md-default-bg-color--light);
    border-radius: 0.5rem;
}

.mega-menu-stat {
    text-align: center;
}

.mega-menu-stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--md-accent-fg-color);
    margin-bottom: 0.25rem;
}

.mega-menu-stat-label {
    font-size: 0.8rem;
    color: var(--md-default-fg-color--light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Mega-Menu Categories */
.mega-menu-category {
    background: var(--md-default-bg-color--light);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1rem;
}

.mega-menu-category h4 {
    margin: 0 0 0.75rem 0;
    color: var(--md-default-fg-color);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Mega-Menu Search */
.mega-menu-search {
    position: relative;
    margin-bottom: 1rem;
}

.mega-menu-search input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--md-default-fg-color--lightest);
    border-radius: 0.5rem;
    font-size: 0.9rem;
    background: var(--md-default-bg-color);
    transition: all 0.3s ease;
}

.mega-menu-search input:focus {
    outline: none;
    border-color: var(--md-accent-fg-color);
    box-shadow: 0 0 0 3px var(--md-accent-fg-color--transparent);
}

.mega-menu-search button {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--md-accent-fg-color);
    color: var(--md-accent-bg-color);
    border: none;
    border-radius: 0.25rem;
    padding: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mega-menu-search button:hover {
    background: var(--md-accent-fg-color--dark);
}

/* Mega-Menu Breadcrumbs */
.mega-menu-breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    padding: 0.5rem 0;
    font-size: 0.8rem;
    color: var(--md-default-fg-color--light);
}

.mega-menu-breadcrumbs a {
    color: var(--md-accent-fg-color);
    text-decoration: none;
    transition: all 0.2s ease;
}

.mega-menu-breadcrumbs a:hover {
    color: var(--md-accent-fg-color--dark);
}

.mega-menu-breadcrumbs span {
    opacity: 0.5;
}

/* Mega-Menu Responsive */
@media screen and (max-width: 768px) {
    .mega-menu {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem;
        margin: 0.5rem;
    }
    
    .mega-menu-column {
        gap: 0.75rem;
    }
    
    .mega-menu-column h3 {
        font-size: 1rem;
        margin-bottom: 0.75rem;
    }
    
    .mega-menu-link {
        padding: 0.5rem;
    }
    
    .mega-menu-icon {
        width: 24px;
        height: 24px;
        font-size: 0.8rem;
    }
    
    .mega-menu-actions {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .mega-menu-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
    
    .mega-menu-stat-number {
        font-size: 1.2rem;
    }
    
    .mega-menu-stat-label {
        font-size: 0.7rem;
    }
}

/* Mega-Menu Animations */
@keyframes megaMenuEntrance {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mega-menu-column {
    animation: megaMenuEntrance 0.5s ease forwards;
}

.mega-menu-column:nth-child(1) { animation-delay: 0.1s; }
.mega-menu-column:nth-child(2) { animation-delay: 0.2s; }
.mega-menu-column:nth-child(3) { animation-delay: 0.3s; }
.mega-menu-column:nth-child(4) { animation-delay: 0.4s; }

/* Mega-Menu Dark Mode */
[data-md-color-scheme="slate"] .mega-menu {
    background: var(--md-default-bg-color);
    border-color: var(--md-default-fg-color--lightest);
}

[data-md-color-scheme="slate"] .mega-menu-featured {
    background: linear-gradient(135deg, var(--md-accent-fg-color--transparent) 0%, transparent 100%);
    border-color: var(--md-accent-fg-color--transparent);
}

[data-md-color-scheme="slate"] .mega-menu-stats {
    background: var(--md-default-bg-color--light);
}

[data-md-color-scheme="slate"] .mega-menu-category {
    background: var(--md-default-bg-color--light);
}

/* Mega-Menu Accessibility */
.mega-menu-link:focus {
    outline: 2px solid var(--md-accent-fg-color);
    outline-offset: 2px;
}

.mega-menu-action:focus {
    outline: 2px solid var(--md-accent-fg-color);
    outline-offset: 2px;
}

/* Mega-Menu Hover Effects */
.mega-menu-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--md-accent-fg-color);
    transition: width 0.3s ease;
}

.mega-menu-link:hover::after {
    width: 100%;
}

/* Mega-Menu Loading State */
.mega-menu-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: var(--md-default-fg-color--light);
}

.mega-menu-loading::before {
    content: "";
    width: 24px;
    height: 24px;
    border: 2px solid var(--md-accent-fg-color--transparent);
    border-top: 2px solid var(--md-accent-fg-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.5rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Mega-Menu Column Headers */
.mega-menu-column h3 {
    color: var(--md-primary-fg-color);
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
    border-bottom: 2px solid var(--md-accent-fg-color);
    padding-bottom: 0.4rem;
}

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

.mega-menu-link {
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    color: var(--md-default-fg-color);
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.mega-menu-link:hover {
    background: var(--md-accent-fg-color--transparent);
    color: var(--md-accent-fg-color);
    transform: translateX(4px);
}

.mega-menu-icon {
    margin-right: 0.5rem;
    font-size: 1.2rem;
}

/* Mobile Responsive */
@media screen and (max-width: 768px) {
    .mega-menu {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem;
    }
    
    .mega-menu-column h3 {
        font-size: 1rem;
    }
}