.knowledge-container {
    display: flex;
    gap: 40px;
    margin-top: 10px; /* Reduced from 40px */
    min-height: 60vh;
}

/* Sidebar */
.knowledge-sidebar {
    width: 280px;
    flex-shrink: 0;
    border-right: 1px solid var(--accent-subtle);
    padding-right: 20px;
    margin-top: 0;
    padding-top: 0;
}

.sidebar-title {
    margin-top: 0;
    margin-bottom: 20px;
    padding-left: 12px; /* Aligned with folder items */
    font-size: 1.2rem;
    color: var(--text-primary);
    line-height: 1.4;
    display: flex;
    align-items: center;
}

.sidebar-title i,
.sidebar-title svg {
    width: 24px; /* Fixed width for icon */
    text-align: center;
    margin-right: 4px; /* Slight gap */
    color: var(--text-secondary); /* Softer icon color */
    font-size: 0.9em;
}

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

.folder-item {
    position: relative;
    display: flex;
    align-items: center;
    padding: 10px 16px 10px 12px; /* Aligned with sidebar title padding */
    margin-bottom: 2px;
    cursor: pointer;
    color: var(--text-secondary, #888);
    transition: all 0.2s ease;
    font-size: 0.95rem;
    border-radius: 6px;
}

.folder-icon {
    width: 24px;
    text-align: center;
    margin-right: 6px;
    font-size: 0.9em;
    opacity: 0.6;
    transition: all 0.2s ease;
}

.folder-item:hover .folder-icon,
.folder-item.active .folder-icon {
    opacity: 1;
}

.folder-item.active .folder-icon {
    color: var(--accent-color);
}

.folder-item:hover {
    color: var(--text-primary, #fff);
    background: var(--bg-secondary, rgba(255, 255, 255, 0.05));
}

.folder-item.active {
    color: var(--accent-color);
    background: color-mix(in srgb, var(--accent-color), transparent 85%);
    font-weight: 600;
    border-radius: 8px; 
}

[data-theme="light"] .folder-item.active {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .folder-item.active .folder-icon {
    color: inherit;
}

/* Content */
.knowledge-content {
    flex: 1;
    margin-top: 0;
    padding-top: 0;
    padding-left: 0;
}

.folder-section {
    display: none;
    animation: fadeIn 0.3s ease;
    margin-top: 0;
}

.folder-section.active {
    display: block;
}

.section-header {
    margin-bottom: 20px; /* Reduced from 30px */
    border-bottom: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    padding-bottom: 10px; /* Reduced from 15px */
    margin-top: 0;
}

.section-header h2 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--text-primary, #fff);
    line-height: 1.4;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 15px; /* Reduced from 20px */
}

@media (max-width: 1400px) {
    .cards-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 1024px) {
    .cards-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }
}

/* Reuse existing card styles or define new ones */
.clean-card {
    background: var(--bg-card, #1a1a1a);
    border: 1px solid var(--border-color, #333);
    border-radius: 12px;
    padding: 20px;
    transition: transform 0.2s ease, border-color 0.2s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.clean-card:hover,
[data-theme="dark"] .clean-card:hover {
    transform: none; /* Removed movement */
    border-color: #34D399; /* Emerald 400 - Explicit Green for Dark Mode */
    box-shadow: 0 0 10px rgba(52, 211, 153, 0.15); /* Subtle green glow */
}

.clean-card h3 {
    font-size: 1.1rem;
    margin: 0 0 12px 0; /* Adjusted margin */
    line-height: 1.4;
}

.clean-card h3 a {
    text-decoration: none;
    color: var(--text-primary, #fff);
}

.knowledge-card-desc {
    font-size: 0.9rem;
    color: var(--text-secondary, #aaa);
    margin: 0 0 16px 0;
    line-height: 1.6;
    flex-grow: 1; /* Push footer to bottom */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--border-color, rgba(255,255,255,0.05));
    font-size: 0.85em;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

[data-theme="light"] .clean-card {
    background: var(--tile-bg-1, #ffffff);
    border-color: var(--border-color, #e5e7eb);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

[data-theme="light"] .clean-card:hover {
    border-color: #d1d5db; /* Gray-300, no green */
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .card-footer {
    border-top-color: var(--border-color, #f3f4f6);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .knowledge-container {
        flex-direction: column;
    }
    .knowledge-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        margin-bottom: 20px;
        padding-bottom: 20px;
    }
}