.thread-list{background:var(--color-background);flex-direction:column;height:100%;display:flex}.thread-list--loading,.thread-list--error{padding:var(--spacing-lg);justify-content:center;align-items:center}.thread-list__loading-indicator{align-items:center;gap:var(--spacing-md);color:var(--color-text-secondary);flex-direction:column;font-size:.875rem;display:flex}.thread-list__error-message{color:var(--color-danger);text-align:center;font-size:.875rem}.thread-list__header{padding:var(--spacing-sm) var(--spacing-md);border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;gap:var(--spacing-sm);display:flex}.thread-list__title{color:var(--color-text);flex:1;margin:0;font-size:.875rem;font-weight:600}.thread-list__header-actions{align-items:center;gap:var(--spacing-xs);display:flex}.thread-list__items{flex:1;overflow-y:auto}.thread-list__empty{padding:var(--spacing-xl);text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;display:flex}.thread-list__empty-text{color:var(--color-text);margin:0 0 var(--spacing-sm);font-size:.875rem}.thread-list__empty-hint{color:var(--color-text-secondary);max-width:200px;margin:0;font-size:.75rem}.thread-list-item{border-radius:var(--border-radius);min-width:0;color:var(--color-text);cursor:pointer;font-family:var(--font-sans);transition:background-color var(--transition-speed-fast) var(--transition-easing);background:0 0;border:none;align-items:center;gap:6px;margin:2px 6px;padding:2px 8px 2px 6px;font-size:.8125rem;line-height:1.4;display:flex}.thread-list-item:hover{background:var(--sidebar-row-hover)}.thread-list-item:focus{background:var(--sidebar-row-hover);outline:none}.thread-list-item:focus-visible{outline:2px solid var(--color-primary);outline-offset:-2px}.thread-list-item--selected,.thread-list-item--selected:hover{background:var(--sidebar-row-active)}.thread-list-item__status{flex-shrink:0;justify-content:center;align-items:center;width:14px;height:14px;display:inline-flex}.thread-list-item__status-glyph{width:14px;height:14px}.thread-list-item__label{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;overflow:hidden}.thread-list-item__timestamp{color:var(--color-text-secondary);text-align:right;white-space:nowrap;flex-shrink:0;font-size:.6875rem;line-height:1.4}.thread-list__collapse-btn{border-radius:var(--border-radius);width:28px;height:28px;color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-speed) var(--transition-easing);background:0 0;border:none;justify-content:center;align-items:center;padding:0;display:flex}.thread-list__collapse-btn:hover{background:var(--color-background-secondary);color:var(--color-text)}.thread-list__collapse-btn svg{width:16px;height:16px}.thread-list-header{justify-content:space-between;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);z-index:var(--z-sticky);pointer-events:none;display:flex;position:absolute;top:0;left:0;right:0}.thread-list-header__agent-slot{align-items:center;gap:var(--spacing-xs);pointer-events:auto;flex-shrink:0;display:flex}.thread-list-header__expand-btn,.thread-list-header__new-btn{border-radius:var(--border-radius);width:28px;height:28px;color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-speed) var(--transition-easing);background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;padding:0;display:flex}.thread-list-header__expand-btn:hover,.thread-list-header__new-btn:hover{background:var(--color-background-secondary);color:var(--color-text)}.thread-list-header__expand-btn svg,.thread-list-header__new-btn svg{width:16px;height:16px}.thread-list-header__selector-wrapper{flex:1;min-width:0;position:relative}.thread-list-header__selector{align-items:center;gap:var(--spacing-xs);max-width:100%;padding:var(--spacing-xs) var(--spacing-sm);border:1px solid var(--color-border);border-radius:var(--border-radius);background:var(--color-background);color:var(--color-text);cursor:pointer;font-family:var(--font-mono);transition:all var(--transition-speed) var(--transition-easing);text-align:left;font-size:.8125rem;display:flex}.thread-list-header__selector:hover,.thread-list-header__selector--active{border-color:var(--color-primary);background:var(--color-background-secondary)}.thread-list-header__selector-text{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.thread-list-header__selector-chevron{color:var(--color-text-secondary);transition:transform var(--transition-speed) var(--transition-easing);flex-shrink:0}.thread-list-header__selector--active .thread-list-header__selector-chevron{transform:rotate(180deg)}.thread-list-header__dropdown{z-index:var(--z-modal);box-sizing:border-box;background:var(--color-background);border:1px solid var(--color-border);border-radius:var(--border-radius);box-shadow:var(--shadow-md);font-family:var(--font-sans);animation:header-dropdown-slide var(--transition-speed-fast) var(--transition-easing-out);margin-top:var(--spacing-xs);flex-direction:column;line-height:1.4;display:flex;position:fixed;top:auto;left:auto;right:auto}@keyframes header-dropdown-slide{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.thread-list-header__dropdown-search{border-bottom:0;padding:0 8px}.thread-list-header__dropdown-title{font-family:var(--font-mono);color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.08em;font-size:11px;font-weight:600;line-height:1}.thread-list-header__dropdown-items{flex-direction:column;flex:1;min-height:0;max-height:320px;padding:4px 0 6px;display:flex;overflow-y:auto}.thread-list-header__dropdown-empty{padding:var(--spacing-lg);text-align:center;color:var(--color-text-secondary);font-size:.875rem}.thread-list-header__dropdown-empty--loading{justify-content:center;align-items:center;display:flex}.thread-list-header__stats-wrapper{flex-shrink:0;margin-left:auto;position:relative}.thread-list-header__stats-wrapper .ui-button{align-items:center;gap:var(--spacing-xs);display:flex}.thread-list-header__stats-dropdown{z-index:var(--z-dropdown);background:var(--color-background);border:1px solid var(--color-border);border-radius:var(--border-radius);min-width:200px;box-shadow:var(--shadow-md);padding:var(--spacing-sm);margin-top:var(--spacing-xs);animation:header-dropdown-slide var(--transition-speed-fast) var(--transition-easing-out);position:absolute;top:100%;right:0}.thread-list-header__stats-item{padding:var(--spacing-xs) var(--spacing-sm);justify-content:space-between;align-items:center;font-size:.75rem;display:flex}.thread-list-header__stats-label{color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.03em;font-weight:500}.thread-list-header__stats-value{color:var(--color-text);font-family:var(--font-mono)}.thread-list-header__stats-error{padding:var(--spacing-xs) var(--spacing-sm);background-color:var(--color-danger-bg);color:var(--color-danger);border-radius:var(--border-radius);margin-top:var(--spacing-xs);font-size:.75rem}.thread-list-header__actions{align-items:center;gap:var(--spacing-sm);row-gap:var(--spacing-xs);pointer-events:auto;flex-wrap:wrap;margin-left:auto;display:flex;position:relative}.thread-list-header__close{pointer-events:auto}.thread-list-header__close.ui-button--ghost{color:var(--color-text-tertiary)}.thread-list-header__close.ui-button--ghost:hover{color:var(--color-text)}.panel-card .thread-list-header{padding:var(--spacing-sm)}.panel-card .thread-list-header:before{content:"";inset:0 max(var(--chat-scrollbar-width,0px), var(--spacing-smd)) calc(-1 * var(--spacing-xl)) 0;z-index:-1;background:linear-gradient(var(--color-background) 25%, color-mix(in srgb, var(--color-background) 75%, transparent) 45%, color-mix(in srgb, var(--color-background) 45%, transparent) 65%, color-mix(in srgb, var(--color-background) 15%, transparent) 85%, transparent);position:absolute}.panel-card .thread-list-header__actions{gap:var(--spacing-xs);margin-left:0}.thread-list-header .ui-spinner--small{border-width:1.5px;width:.75em;height:.75em}.thread-list-header__parent-button{white-space:nowrap}.thread-list-header__linear-indicator{position:absolute;top:2px;right:2px}.selection-prompt-pill{z-index:var(--z-popover);align-items:center;gap:var(--spacing-xs);height:24px;padding:0 var(--spacing-sm);border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-background);box-shadow:var(--shadow-md);color:var(--color-text);font-family:var(--font-mono);white-space:nowrap;cursor:pointer;pointer-events:auto;font-size:.75rem;line-height:1;display:inline-flex}.selection-prompt-pill:hover{background:var(--color-background-secondary);outline:none}.selection-prompt-pill:focus-visible{background:var(--color-background-secondary);outline:none}.selection-prompt-compose{z-index:var(--z-popover);width:340px;max-width:calc(100vw - var(--spacing-md))}.thread-card--compact[data-pending=true] .thread-card__composer{padding:0}.thread-card--compact .thread-card-composer__input,.thread-card--compact .thread-card-composer__editor .cm-content{min-height:40px;padding:var(--spacing-sm)}.thread-card--compact .thread-card-composer__footer{padding:0 var(--spacing-sm) var(--spacing-sm)}.thread-card--compact .thread-card-composer__footer .ui-button{margin-left:auto}::highlight(selection-prompt){background:color-mix(in srgb, var(--color-text) 14%, transparent)}