/*
 * Ink & Paper - Sidebar
 * Refined navigation with editorial elegance
 */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    z-index: 50;
}

/* Sidebar Header - App branding and primary action */
.sidebar-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border-subtle);
}

.sidebar-header .btn-primary {
    flex: 1;
    padding: 0.5rem 0.875rem;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: var(--text-sm);
    letter-spacing: 0.01em;
    justify-content: center;
}

.sidebar-header .btn-ghost {
    width: 32px;
    height: 32px;
    padding: 0;
    flex-shrink: 0;
}

.sidebar-header .btn-ghost i {
    font-size: 0.85rem;
}

/* Search */
.search-container {
    padding: 0.75rem 1rem;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input-wrapper i {
    position: absolute;
    left: 0.875rem;
    color: var(--color-text-tertiary);
    font-size: var(--text-xs);
    pointer-events: none;
}

.search-input-wrapper input {
    width: 100%;
    padding: 0.5rem 2rem 0.5rem 2.25rem;
    font-family: var(--font-body);
    font-size: var(--text-sm);
    background-color: var(--color-bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    transition:
        border-color var(--transition-fast),
        background-color var(--transition-fast),
        box-shadow var(--transition-fast);
}

.search-input-wrapper input::placeholder {
    color: var(--color-text-tertiary);
}

.search-input-wrapper input:hover {
    background-color: var(--color-bg-hover);
}

.search-input-wrapper input:focus {
    outline: none;
    border-color: var(--color-accent);
    background-color: var(--color-bg-elevated);
    box-shadow: var(--shadow-glow);
}

.search-clear {
    position: absolute;
    right: 0.375rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    border-radius: var(--radius-full);
    transition:
        background-color var(--transition-fast),
        color var(--transition-fast);
}

.search-clear:hover {
    background-color: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* Folder Tree */
.folder-tree {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

/* Section label for notes */
.folder-tree::before {
    content: 'Notes';
    display: block;
    padding: 0.5rem 1.25rem 0.75rem;
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
}

/* Tree items shared styles */
.folder-item,
.note-item {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.625rem 1.25rem;
    margin: 0 0.5rem;
    font-family: var(--font-body);
    font-size: var(--text-sm);
    color: var(--color-text-primary);
    cursor: pointer;
    border: none;
    background: none;
    width: calc(100% - 1rem);
    text-align: left;
    border-radius: var(--radius-md);
    transition:
        background-color var(--transition-fast),
        color var(--transition-fast);
    position: relative;
}

.folder-item:hover,
.note-item:hover {
    background-color: var(--color-bg-hover);
}

/* Selection indicator */
.folder-item.selected,
.note-item.selected {
    background-color: var(--color-accent-light);
    color: var(--color-text-primary);
}

.folder-item i,
.note-item i {
    width: 1rem;
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.8rem;
    flex-shrink: 0;
    transition: color var(--transition-fast);
}

.folder-item.selected i,
.note-item.selected i {
    color: var(--color-accent);
}

.folder-content {
    display: none;
}

.folder-content.expanded {
    display: block;
}

/* Folder toggle chevron */
.folder-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 0.125rem;
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition:
        transform var(--transition-fast),
        color var(--transition-fast);
    border-radius: var(--radius-sm);
}

.folder-toggle:hover {
    color: var(--color-text-secondary);
    background-color: var(--color-bg-hover);
}

.folder-toggle.expanded {
    transform: rotate(90deg);
}

.folder-children {
    padding-left: 1rem;
}

/* Note items - add space to align icons with folder icons (accounting for toggle button) */
.note-item {
    padding-left: 2.65rem;
}

.note-item .note-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.note-item .note-date {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    flex-shrink: 0;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.note-item:hover .note-date {
    opacity: 1;
}

/* Note delete button */
.note-delete-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    padding: 0;
    margin-left: auto;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-tertiary);
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast), color var(--transition-fast), background-color var(--transition-fast);
    flex-shrink: 0;
}

.note-item:hover .note-delete-btn {
    opacity: 1;
}

.note-delete-btn:hover {
    color: var(--color-danger);
    background-color: rgba(168, 50, 50, 0.1);
}

.note-delete-btn i {
    font-size: 0.7rem;
}

/* Sidebar Footer */
.sidebar-footer-separator {
    height: 1px;
    margin: 0 1rem;
    background-color: var(--color-border-subtle);
}

.sidebar-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0.75rem 1rem;
    background-color: var(--color-bg-secondary);
}

.sidebar-footer .btn {
    width: 36px;
    height: 36px;
    padding: 0;
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
}

.sidebar-footer .btn i {
    font-size: 0.9rem;
}

/* Sidebar Toggle (Mobile only) */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 60;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition:
        background-color var(--transition-fast),
        box-shadow var(--transition-fast);
}

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

    .sidebar {
        width: 280px;
        left: -280px;
        box-shadow: var(--shadow-xl);
    }

    .sidebar.open {
        left: 0;
    }
}

.sidebar-toggle:hover {
    background-color: var(--color-bg-hover);
    box-shadow: var(--shadow-lg);
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
    z-index: 40;
    opacity: 0;
    visibility: hidden;
    transition:
        opacity var(--transition-normal),
        visibility var(--transition-normal);
}

.sidebar-overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* Drag and Drop States */
.folder-item.drag-over,
.note-item.drag-over {
    background-color: var(--color-accent-light);
    outline: 2px dashed var(--color-accent);
    outline-offset: -2px;
}

.folder-item.dragging,
.note-item.dragging {
    opacity: 0.5;
}

.folder-tree.drag-over {
    background-color: var(--color-accent-light);
}

/* Empty folder state */
.folder-empty {
    padding: 0.5rem 1.25rem 0.5rem 2.5rem;
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    font-style: italic;
}

/* Animation for new items */
@keyframes noteSlideIn {
    from {
        opacity: 0;
        transform: translateX(-8px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.note-item.new-item {
    animation: noteSlideIn 0.25s ease;
}