/* 聊天布局 */
.chat-layout {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* 侧边栏 */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s;
    flex-shrink: 0;
}

.sidebar.collapsed {
    transform: translateX(-100%);
    width: 0;
    border: none;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 8px;
}

.sidebar-header .btn {
    flex: 1;
}

.session-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.session-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.2s;
    margin-bottom: 4px;
}

.session-item:hover {
    background: var(--bg-card);
}

.session-item.active {
    background: var(--primary);
    color: white;
}

.session-item .session-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
}

.session-item .session-delete {
    opacity: 0;
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 4px;
    font-size: 16px;
}

.session-item:hover .session-delete {
    opacity: 1;
}

/* 主区域 */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* 工具栏 */
.toolbar {
    height: var(--toolbar-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 12px;
    flex-shrink: 0;
}

.toolbar select {
    padding: 6px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 13px;
}

.toolbar .toggle-sidebar {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 20px;
    padding: 4px;
}

/* 思考模式开关 */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch .slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--border-color);
    border-radius: 20px;
    transition: 0.3s;
}

.toggle-switch .slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    border-radius: 50%;
    transition: 0.3s;
}

.toggle-switch input:checked + .slider {
    background-color: var(--primary);
}

.toggle-switch input:checked + .slider:before {
    transform: translateX(20px);
}

/* 消息区域 */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: var(--radius);
    line-height: 1.6;
    font-size: 14px;
    word-wrap: break-word;
}

.message.user {
    align-self: flex-end;
    background: var(--primary);
    color: white;
    border-bottom-right-radius: 2px;
}

.message.assistant {
    align-self: flex-start;
    background: var(--bg-card);
    border-bottom-left-radius: 2px;
}

.message .message-role {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

/* 思考内容折叠 */
.thinking-toggle {
    font-size: 12px;
    color: var(--primary);
    cursor: pointer;
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.thinking-content {
    display: none;
    margin-top: 8px;
    padding: 12px;
    background: rgba(0,0,0,0.2);
    border-radius: var(--radius);
    font-size: 13px;
    color: var(--text-secondary);
    border-left: 3px solid var(--primary);
}

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

/* 打字机光标 */
.typing-cursor::after {
    content: '▊';
    animation: blink 1s step-end infinite;
    color: var(--primary);
}

@keyframes blink {
    50% { opacity: 0; }
}

/* 输入区域 */
.input-area {
    padding: 16px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 8px 12px;
}

.input-wrapper textarea {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    resize: none;
    max-height: 120px;
    min-height: 24px;
    font-family: var(--font-family);
}

.input-wrapper textarea:focus {
    outline: none;
}

.input-wrapper button {
    background: var(--primary);
    border: none;
    color: white;
    padding: 8px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    white-space: nowrap;
}

.input-wrapper button:hover {
    background: var(--primary-hover);
}

.input-wrapper button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 文件预览 */
.file-preview {
    display: flex;
    gap: 8px;
    padding: 8px 0;
    flex-wrap: wrap;
}

.file-preview-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px;
    background: var(--bg-card);
    border-radius: 4px;
    font-size: 12px;
}

.file-preview-item .remove-file {
    cursor: pointer;
    color: var(--danger);
    font-weight: bold;
}

/* 空状态 */
.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 60px 20px;
}

.empty-state h3 {
    margin-bottom: 8px;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        z-index: 100;
        height: 100vh;
    }
    .message {
        max-width: 95%;
    }
    .toolbar {
        flex-wrap: wrap;
        height: auto;
        padding: 8px 12px;
    }
}