/* Notebook Specific Styles */

/* Search and Filter Section */
.notebook-header {
    margin-bottom: 2rem;
}

.search-container {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    align-items: center;
}

.search-box {
    flex: 1;
    min-width: 300px;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 3rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--surface-color);
}

.search-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.filter-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag-filter {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.tag-filter:hover {
    border-color: var(--secondary-color);
    background: rgba(0, 102, 255, 0.05);
}

.tag-filter.active {
    background: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

/* Article Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.article-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    cursor: pointer;
    position: relative;
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-color);
}

.article-card.draft {
    opacity: 0.7;
    border-left: 4px solid orange;
}

.article-cover {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.article-cover.placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
    font-weight: bold;
}

.article-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.article-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    text-decoration: none;
    line-height: 1.4;
}

.article-excerpt {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
    flex-grow: 1;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.article-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.article-stats {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.article-tags {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.article-tag {
    padding: 0.25rem 0.75rem;
    background: rgba(0, 102, 255, 0.1);
    color: var(--secondary-color);
    border-radius: 12px;
    font-size: 0.8rem;
}

/* Admin Controls */
.admin-controls {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: var(--transition);
    z-index: 10;
}

.article-card:hover .admin-controls {
    opacity: 1;
}

.admin-btn {
    padding: 0.5rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.admin-btn:hover {
    background: var(--primary-color);
    color: white;
}

.admin-btn.edit {
    color: var(--secondary-color);
}

.admin-btn.delete {
    color: #ef4444;
}

.admin-btn.delete:hover {
    background: #ef4444;
    color: white;
}

/* Floating Action Button */
.fab-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 100;
}

.fab {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    font-size: 1.5rem;
}

.fab:hover {
    transform: scale(1.1);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.15);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

/* Loading State */
.articles-loading {
    display: flex;
    justify-content: center;
    padding: 4rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--secondary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .search-container {
        flex-direction: column;
    }
    
    .search-box {
        min-width: 100%;
    }
}