.chat-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
    padding: var(--space-5) 0;
    height: calc(100vh - 72px)
}

body:has(.site-footer) .chat-layout {
    height: auto;
    min-height: 420px
}

.chat-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--surface-0, #FFFFFF);
    box-shadow: var(--shadow-static);
    overflow-y: auto
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--fs-sm);
    color: var(--text-body);
    background: var(--gray-50);
    cursor: pointer;
    transition: var(--transition-fast)
}

.conversation-item__title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap
}

.conversation-item__delete {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--neutral-gray);
    background: transparent;
    flex-shrink: 0;
    transition: var(--transition-fast)
}

.conversation-item__delete:hover {
    color: var(--danger-red);
    background: #fdecec
}

.conversation-item:hover, .conversation-item.active {
    color: var(--primary-blue-dark);
    background: #e6f1fb
}

.chat-main {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--surface-0, #FFFFFF);
    box-shadow: var(--shadow-static);
    overflow: hidden
}

.chat-messages {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-5);
    flex: 1;
    overflow-y: auto
}

.bubble {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    max-width: min(88%, 720px);
    font-size: var(--fs-sm);
    line-height: var(--lh-body)
}

.bubble-meta {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--fs-xs);
    font-weight: 700;
    color: var(--text-muted)
}

.bubble-content p {
    margin: 0 0 var(--space-3);
    font-size: var(--fs-base);
    line-height: var(--lh-body);
    color: inherit
}

.bubble-content p:last-child {
    margin-bottom: 0
}

.bubble-content .rich-list {
    margin: 0 0 var(--space-3);
    padding: 0 var(--space-5) 0 0
}

.bubble.user {
    align-self: flex-start;
    color: var(--background);
    background: linear-gradient(135deg, var(--primary-blue-dark) 0%, var(--primary-blue) 100%);
    border-color: transparent
}

.bubble.user .bubble-meta {
    color: rgba(255, 255, 255, 0.82)
}

.bubble.assistant {
    align-self: flex-end;
    color: var(--text-dark);
    background: var(--surface-0);
    box-shadow: var(--shadow-static)
}

.bubble.assistant .bubble-meta {
    color: var(--primary-blue)
}

.chat-empty {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    align-items: center;
    justify-content: center;
    flex: 1;
    text-align: center;
    color: var(--neutral-gray)
}

.chat-empty i {
    font-size: var(--fs-3xl)
}

.chat-context {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    color: var(--primary-blue-dark);
    background: #e6f1fb;
    font-size: var(--fs-sm);
    font-weight: 600
}

.chat-attachment {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-top: 1px solid var(--border-color);
    color: var(--text-body);
    background: var(--gray-50);
    font-size: var(--fs-sm)
}

.chat-attachment button {
    color: var(--danger-red)
}

.chat-input-bar {
    display: flex;
    align-items: flex-end;
    gap: var(--space-2);
    padding: var(--space-3);
    border-top: 1px solid var(--border-color);
    background: var(--surface-0, #FFFFFF)
}

.chat-input-bar .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    flex-shrink: 0
}

.chat-attach-btn {
    flex-shrink: 0
}

.chat-input-bar textarea {
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    flex: 1;
    min-height: 40px;
    max-height: 120px;
    resize: none;
    font-size: var(--fs-sm);
    line-height: 1.5;
    color: var(--text-dark);
    transition: var(--transition-fast)
}

.chat-input-bar textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(30, 127, 216, 0.15)
}

.typing {
    align-self: flex-end;
    font-size: var(--fs-sm);
    color: var(--neutral-gray)
}

@media screen and (min-width: 1023px) {
    .chat-layout {
        grid-template-columns: 300px 1fr
    }
}