.left-sidebar { width: 300px; min-width: 300px; background-color: var(--bg-card); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; overflow: hidden; }
.sidebar-section { border-bottom: 1px solid var(--border-color); display: flex; flex-direction: column; overflow: hidden; }
.section-header { padding: var(--spacing-md) var(--spacing-lg); display: flex; align-items: center; justify-content: space-between; cursor: pointer; user-select: none; transition: background-color 0.15s; flex-shrink: 0; }
.section-header:hover { background-color: var(--bg-hover); }
.section-title { font-family: var(--font-mono); font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-secondary); display: flex; align-items: center; gap: var(--spacing-sm); }
.section-header-actions { display: flex; align-items: center; gap: 4px; }
.section-header-actions button { background: transparent; border: none; color: var(--text-muted); cursor: pointer; padding: 4px 6px; border-radius: var(--radius-sm); font-size: 12px; }
.section-header-actions button:hover { color: var(--accent); background: var(--bg-hover); }
.section-toggle { color: var(--text-muted); font-size: 12px; transition: transform 0.2s; }
.section-header.collapsed .section-toggle { transform: rotate(-90deg); }
.section-content { overflow-y: auto; flex: 1; }
.section-content.collapsed { display: none; }

/* collections tree */
.collections-list { padding: 0 var(--spacing-md) var(--spacing-md); }
.collection-group { margin-bottom: 4px; }
.collection-header { display: flex; align-items: center; gap: 6px; padding: 7px 8px; border-radius: var(--radius-sm); cursor: pointer; }
.collection-header:hover { background-color: var(--bg-elevated); }
.collection-header .c-chevron { font-size: 10px; color: var(--text-muted); transition: transform 0.15s; width: 10px; flex-shrink: 0; }
.collection-header.open .c-chevron { transform: rotate(90deg); }
.collection-header .c-name { font-family: var(--font-mono); font-size: 12px; font-weight: 600; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.collection-header .c-count { font-size: 10px; color: var(--text-muted); }
.collection-header .c-menu-btn { background: transparent; border: none; color: var(--text-muted); cursor: pointer; padding: 2px 5px; border-radius: 4px; font-size: 11px; opacity: 0; }
.collection-header:hover .c-menu-btn { opacity: 1; }
.collection-header .c-menu-btn:hover { color: var(--accent); background: var(--bg-hover); }

.collection-items { padding-left: 18px; display: none; }
.collection-items.open { display: block; }
.collection-item { display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-radius: var(--radius-sm); cursor: pointer; }
.collection-item:hover { background-color: var(--bg-elevated); }
.collection-item .ci-name { font-family: var(--font-mono); font-size: 11.5px; color: var(--text-secondary); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.collection-item:hover .ci-name { color: var(--text-primary); }
.collection-item .ci-menu-btn { background: transparent; border: none; color: var(--text-muted); cursor: pointer; padding: 2px 5px; border-radius: 4px; font-size: 10px; opacity: 0; flex-shrink: 0; }
.collection-item:hover .ci-menu-btn { opacity: 1; }
.collection-empty { font-size: 11px; color: var(--text-muted); padding: 6px 8px 6px 18px; font-style: italic; }
.collections-empty-all { text-align: center; padding: var(--spacing-xl) var(--spacing-lg); color: var(--text-muted); font-size: 12px; }

.new-collection-row { display: flex; gap: 6px; padding: 0 var(--spacing-md) var(--spacing-sm); }
.new-collection-row input { flex: 1; background-color: var(--bg-elevated); border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 6px 8px; color: var(--text-primary); font-family: var(--font-mono); font-size: 11.5px; outline: none; }

/* history */
.history-list { flex: 1; overflow-y: auto; padding: 0 var(--spacing-lg); }
.history-item { padding: var(--spacing-md); border-radius: var(--radius-md); cursor: pointer; margin-bottom: var(--spacing-sm); transition: background-color 0.15s; border: 1px solid transparent; }
.history-item:hover { background-color: var(--bg-elevated); border-color: var(--border-color); }
.history-item-header { display: flex; align-items: center; gap: var(--spacing-sm); margin-bottom: var(--spacing-xs); }
.history-url { font-family: var(--font-mono); font-size: 12px; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.history-meta { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); margin-top: var(--spacing-xs); display: flex; gap: var(--spacing-md); }
.history-empty { text-align: center; padding: var(--spacing-xl); color: var(--text-muted); font-size: 13px; }

/* context menu (tiny dropdown for collection/request actions) */
.ctx-menu { position: fixed; background-color: var(--bg-elevated); border: 1px solid var(--border-color); border-radius: var(--radius-sm); box-shadow: 0 8px 24px rgba(0,0,0,0.4); z-index: 600; min-width: 160px; padding: 4px; }
.ctx-menu button { width: 100%; text-align: left; padding: 7px 10px; background: transparent; border: none; color: var(--text-secondary); font-family: var(--font-body); font-size: 12px; cursor: pointer; border-radius: 4px; display: flex; align-items: center; gap: 8px; }
.ctx-menu button:hover { background-color: var(--bg-hover); color: var(--text-primary); }
.ctx-menu button.danger:hover { color: var(--error); }