/* ========================================
   ## MAIN CONTAINER
   ======================================== */
.main-container {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

/* ========================================
   ## SPLIT CONTAINER
   ======================================== */
.split-container {
    display: flex;
    width: 100%;
    height: 100%;
    position: relative;
}

/* ========================================
   ## CHATS SIDEBAR
   ======================================== */
.chats-panel {
    width: 0;
    overflow: hidden;
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    border-right: 1px solid hsl(var(--border));
    background: hsl(var(--background));
    flex-shrink: 0;
    will-change: width;
}

.chats-panel.active {
    width: 234px;
    min-width: 234px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chats-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 0.75rem;
    overflow: hidden;
}

.chats-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    flex-shrink: 0;
}

.chats-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: hsl(var(--primary));
    margin: 0;
}

.chats-header-actions {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.new-chat-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background: hsl(var(--primary) / 0.15);
    border: none;
    border-radius: 0.375rem;
    color: hsl(var(--primary));
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0;
    flex-shrink: 0;
}

.new-chat-btn:hover {
    background: hsl(var(--primary) / 0.25);
    transform: scale(1.1);
}

.new-chat-btn i {
    width: 14px;
    height: 14px;
}

.chats-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background: transparent;
    border: none;
    border-radius: 0.375rem;
    color: hsl(var(--muted-foreground));
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0;
    flex-shrink: 0;
}

.chats-close:hover {
    background: hsl(var(--muted) / 0.5);
    color: hsl(var(--foreground));
    transform: scale(1.1) rotate(90deg);
}

.chats-close i,
.chats-close svg {
    width: 14px;
    height: 14px;
}

.chats-search {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4375rem 0.625rem;
    background: linear-gradient(135deg, hsl(240 8% 14%) 0%, hsl(240 8% 12%) 100%);
    border: 1px solid hsl(var(--border));
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    flex-shrink: 0;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.chats-search:focus-within {
    border-color: hsl(var(--primary) / 0.5);
    box-shadow: 0 0 0 3px hsl(var(--primary) / 0.15);
    transform: translateY(-1px);
}

.chats-search svg {
    width: 14px;
    height: 14px;
    color: hsl(var(--muted-foreground));
    flex-shrink: 0;
}

.chats-search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: hsl(var(--foreground));
    font-size: 0.75rem;
    font-family: inherit;
}

.chats-search-input::placeholder {
    color: hsl(var(--muted-foreground));
}

.chats-filter {
    display: flex;
    gap: 0.3125rem;
    margin-bottom: 0.5rem;
    flex-shrink: 0;
    flex-wrap: wrap;
}

.chats-filter-btn {
    padding: 0.25rem 0.5rem;
    background: hsl(var(--muted) / 0.5);
    border: 1px solid hsl(var(--border));
    border-radius: 9999px;
    color: hsl(var(--muted-foreground));
    font-size: 0.6875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
    white-space: nowrap;
    line-height: 1.2;
}

.chats-filter-btn:hover {
    background: hsl(var(--muted) / 0.7);
    color: hsl(var(--foreground));
    transform: translateY(-1px);
    box-shadow: 0 2px 8px hsl(var(--background) / 0.3);
}

.chats-filter-btn.active {
    background: transparent;
    color: hsl(var(--primary));
    border-color: hsl(var(--primary));
    border-width: 1.5px;
}

/* New chat button in filter row */
.chats-filter .new-chat-btn {
    margin-left: auto;
    width: 24px;
    height: 24px;
}

.chats-filter .new-chat-btn i {
    width: 14px;
    height: 14px;
}

.chats-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 0.25rem;
    margin-right: -0.25rem;
}

.chats-date-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    margin-bottom: 0.5rem;
}

.chats-date-header {
    padding: 0.1875rem 0.4375rem;
    font-size: 0.625rem;
    font-weight: 600;
    color: hsl(var(--muted-foreground));
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.chat-item {
    background: linear-gradient(135deg, hsl(240 8% 14%) 0%, hsl(240 8% 12%) 100%);
    border: 1px solid hsl(var(--border));
    border-radius: 0.5rem;
    padding: 0.5rem 0.625rem;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.chat-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, hsl(25 85% 55%) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.chat-item:hover::before,
.chat-item.active::before {
    opacity: 1;
}

.chat-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px hsl(var(--background) / 0.4);
    border-color: hsl(var(--primary) / 0.4);
}

.chat-item.active {
    background: hsl(var(--primary) / 0.1);
    border-color: hsl(var(--primary));
    box-shadow: 0 2px 8px hsl(var(--primary) / 0.2);
}

.chat-item-name {
    font-size: 0.75rem;
    color: hsl(var(--foreground));
    font-weight: 500;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

.chat-item-actions {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-left: 0.5rem;
    opacity: 0;
    transition: opacity 0.2s;
    flex-shrink: 0;
    width: 18px;
}

.chat-item:hover .chat-item-actions {
    opacity: 1;
}

.chat-delete-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 14px;
    height: 14px;
    background: transparent;
    border: none;
    border-radius: 0.25rem;
    color: hsl(var(--muted-foreground));
    cursor: pointer;
    transition: all 0.2s;
    padding: 0;
}

.chat-delete-btn:hover {
    background: hsl(var(--primary) / 0.15);
    color: hsl(var(--primary));
}

.chat-delete-btn i {
    width: 9px;
    height: 9px;
}

.chat-item.local::after {
    content: '';
    width: 6px;
    height: 6px;
    background: hsl(var(--warning, 45 100% 50%));
    border-radius: 50%;
    margin-left: 0.25rem;
    flex-shrink: 0;
}

.chats-bar-item.local::after {
    content: '';
    width: 4px;
    height: 4px;
    background: hsl(var(--warning, 45 100% 50%));
    border-radius: 50%;
    margin-left: 0.25rem;
    flex-shrink: 0;
}

.chats-local-warning {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.5rem;
    background: hsl(var(--primary) / 0.06);
    border-top: 1px solid hsl(var(--border));
    font-size: 0.625rem;
    color: hsl(var(--muted-foreground));
    flex-shrink: 0;
    margin-top: auto;
}

.chats-local-warning i,
.chats-local-warning svg {
    width: 10px;
    height: 10px;
    flex-shrink: 0;
    color: hsl(var(--primary));
}

.chats-local-warning a {
    color: hsl(var(--primary));
    text-decoration: none;
    font-weight: 500;
}

.chats-local-warning a:hover {
    text-decoration: underline;
}

.chats-toggle {
    background: transparent;
    border: none;
    padding: 0.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 0.5rem;
    transition: opacity 0.2s;
}

.chats-toggle:hover {
    opacity: 0.8;
}

.chats-toggle.active .list-icon {
    color: hsl(var(--primary));
}

.chat-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 400px;
    overflow: hidden;
}

.catalog-panel {
    width: 0;
    overflow: hidden;
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 1px solid hsl(var(--border));
    background: hsl(var(--background));
    will-change: width;
}

.catalog-panel.active {
    width: 50%;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.resizer {
    display: none;
    width: 1px;
    cursor: col-resize;
    background: hsl(var(--border));
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 10;
    flex-shrink: 0;
}

.catalog-panel.active ~ .resizer {
    display: block;
}

.resizer:hover,
.resizer.resizing {
    background: hsl(var(--primary) / 0.8);
    box-shadow: 0 0 12px hsl(var(--primary) / 0.4);
}

.resizer::before {
    content: '';
    position: absolute;
    left: -4px;
    right: -4px;
    top: 0;
    bottom: 0;
    cursor: col-resize;
}

/* Визуальная ручка для перетаскивания */
.resizer::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 3px;
    height: 40px;
    background: hsl(var(--muted-foreground) / 0.4);
    border-radius: 2px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    box-shadow: 
        0 -1px 0 hsl(var(--muted-foreground) / 0.2),
        0 1px 0 hsl(var(--muted-foreground) / 0.2);
}

.resizer:hover::after,
.resizer.resizing::after {
    background: hsl(var(--primary) / 0.8);
    box-shadow: 
        0 -1px 0 hsl(var(--primary) / 0.4),
        0 1px 0 hsl(var(--primary) / 0.4);
}

/* ========================================
   ## SIDEBAR OVERLAY (for mobile)
   ======================================== */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(4px);
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}