/*
================================================================
聊天区域样式
================================================================
包含消息列表、消息气泡、输入区域的样式。
*/

/* ========== 主聊天区 ========== */
#chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-chat);
    min-width: 0;  /* 防止 flex 子元素溢出 */
}

/* ========== 聊天头部 ========== */
#chat-header {
    display: flex;
    align-items: center;
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-chat);
}

#chat-header h1 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-left: var(--space-md);
}

/* ========== 联网搜索开关 ========== */
.search-toggle {
    position: relative;  /* 作为提示气泡的定位基准 */
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: var(--space-md);
    padding: 4px 10px 4px 6px;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    cursor: pointer;
    user-select: none;
    flex-shrink: 0;  /* 防止被标题挤压变形 */
    transition: border-color 0.2s, background 0.2s;
}

.search-toggle:hover {
    border-color: var(--color-primary-light);
    background: #EEF2FF;
}

/* 真实 checkbox 隐藏，只保留状态 */
.search-toggle input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

/* 开关轨道 */
.toggle-track {
    position: relative;
    display: inline-block;
    width: 34px;
    height: 18px;
    background: #D1D5DB;
    border-radius: 999px;
    transition: background 0.2s;
}

/* 开关滑块 */
.toggle-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    background: #FFFFFF;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s;
}

/* ---- 开启状态 ---- */
.search-toggle input[type="checkbox"]:checked + .toggle-track {
    background: var(--color-primary);
}

.search-toggle input[type="checkbox"]:checked + .toggle-track .toggle-thumb {
    transform: translateX(16px);
}

.search-toggle input[type="checkbox"]:checked ~ .toggle-label {
    color: var(--color-primary);
    font-weight: 600;
}

/* 键盘可达性：焦点环 */
.search-toggle input[type="checkbox"]:focus-visible + .toggle-track {
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.25);
}

/* 文字标签 */
.toggle-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: color 0.2s;
}

/* 请求进行中：禁用开关 */
.search-toggle.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.search-toggle.disabled:hover {
    border-color: var(--border-color);
    background: transparent;
}

/* ========== 提示气泡（纯 CSS，零 JS） ==========
   文案直接写在 label 的 data-tooltip 属性里，
   想改文字只改 index.html 那一处即可。
   延迟 0.25s 出现，避免鼠标划过时一闪而过。 */
.search-toggle::after {
    content: attr(data-tooltip);
    position: absolute;
    top: calc(100% + 9px);
    left: 0;
    z-index: 100;

    width: max-content;
    max-width: 240px;
    padding: 7px 10px;

    background: var(--bg-sidebar);  /* 深色，与侧栏统一 */
    color: #FFFFFF;
    font-size: 0.75rem;
    font-weight: 400;
    line-height: 1.55;
    text-align: left;

    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);

    /* 默认隐藏 */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    pointer-events: none;  /* 不拦截鼠标，避免反复闪烁 */
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s linear 0.25s;
    transition-delay: 0.25s;
}

/* 气泡上方的小三角，指向开关 */
.search-toggle::before {
    content: "";
    position: absolute;
    top: calc(100% + 4px);
    left: 14px;
    z-index: 101;

    border: 5px solid transparent;
    border-bottom-color: var(--bg-sidebar);

    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.18s ease, visibility 0s linear 0.25s;
    transition-delay: 0.25s;
}

/* 鼠标悬停时显示 */
.search-toggle:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition-delay: 0s;
}

.search-toggle:hover::before {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
}

#btn-toggle-sidebar {
    display: none;  /* 桌面端默认隐藏，移动端显示 */
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-xs) var(--space-sm);
}

/* ========== 消息列表 ========== */
#message-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* 欢迎消息 */
.welcome-message {
    text-align: center;
    color: var(--text-secondary);
    margin: auto;
    padding: var(--space-lg);
}

.welcome-message p {
    margin-bottom: var(--space-sm);
}

/* ========== 消息气泡 ========== */
.message {
    max-width: 80%;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    line-height: 1.6;
    word-wrap: break-word;
    animation: fadeIn 0.3s ease;
}

/* 用户消息 — 靠右、紫色 */
.message.user {
    align-self: flex-end;
    background: var(--bubble-user);
    color: var(--bubble-user-text);
    border-bottom-right-radius: var(--radius-sm);
}

/* AI 消息 — 靠左、浅灰 */
.message.assistant {
    align-self: flex-start;
    background: var(--bubble-assistant);
    color: var(--text-primary);
    border-bottom-left-radius: var(--radius-sm);
}

/* 工具调用消息 — 靠左、浅绿边框 */
.message.tool-call {
    align-self: flex-start;
    background: var(--bubble-tool);
    border: 1px solid var(--bubble-tool-border);
    border-left: 4px solid var(--bubble-tool-border);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

/* 消息角色标签 */
.message .role-label {
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    opacity: 0.7;
}

/* 消息时间戳 */
.message .timestamp {
    font-size: 0.7rem;
    opacity: 0.5;
    margin-top: var(--space-xs);
}

/* ========== 流式输出光标动画 ========== */
.streaming-cursor::after {
    content: "▊";
    animation: blink 1s step-end infinite;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== 输入区域 ========== */
#input-area {
    display: flex;
    align-items: flex-end;
    padding: var(--space-md);
    border-top: 1px solid var(--border-color);
    background: var(--bg-input);
    gap: var(--space-sm);
}

#message-input {
    flex: 1;
    resize: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-family);
    font-size: 0.95rem;
    line-height: 1.5;
    max-height: 120px;
    outline: none;
    transition: border-color 0.2s;
}

#message-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

#btn-send {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

#btn-send:hover {
    background: var(--color-primary-dark);
}

#btn-send:disabled {
    background: var(--border-color);
    cursor: not-allowed;
}

/* 上传按钮 */
#btn-upload {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: var(--border-color);
    font-size: 1.1rem;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.2s;
}

#btn-upload:hover {
    background: var(--text-secondary);
}

#btn-upload:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 图表 */
.plot-image {
    max-width: 100%;
    border-radius: var(--radius-sm);
    display: block;
}

/* ========== Markdown 样式 ========== */
/* 代码块 */
.message-content pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: var(--space-sm) 0;
    font-size: 0.85rem;
    line-height: 1.5;
}

.message-content code {
    font-family: var(--font-mono);
    font-size: 0.85em;
}

/* 行内代码 */
.message-content :not(pre) > code {
    background: rgba(0, 0, 0, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    color: #e01a76;
}

/* 段落 */
.message-content p {
    margin-bottom: var(--space-sm);
    line-height: 1.7;
}

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

/* 标题 */
.message-content h1,
.message-content h2,
.message-content h3 {
    margin: var(--space-sm) 0 var(--space-xs) 0;
    font-weight: 600;
    line-height: 1.4;
}

.message-content h1 { font-size: 1.4rem; }
.message-content h2 { font-size: 1.2rem; }
.message-content h3 { font-size: 1.05rem; }

/* 列表 */
.message-content ul {
    padding-left: var(--space-lg);
    margin: var(--space-xs) 0;
}

.message-content li {
    margin-bottom: var(--space-xs);
    line-height: 1.6;
}

/* 粗体 */
.message-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

/* ========== 思考过程（仅开启「深度思考」时出现） ========== */
.reasoning-block {
    margin-bottom: var(--space-sm);
    border-left: 3px solid var(--color-primary-light);
    background: rgba(79, 70, 229, 0.05);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

/* 标题栏（点击可手动展开 / 收起） */
.reasoning-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
}

.reasoning-header:hover {
    background: rgba(79, 70, 229, 0.08);
}

/* 右侧的「展开 / 收起」提示文字 */
.reasoning-hint {
    margin-left: auto;
    font-size: 0.72rem;
    opacity: 0.75;
}

/* 思考正文 */
.reasoning-content {
    padding: 0 12px 10px 12px;
    font-size: 0.82rem;
    line-height: 1.7;
    color: var(--text-secondary);
    white-space: pre-wrap;   /* 保留模型输出里的换行 */
    word-break: break-word;
    max-height: 320px;
    overflow-y: auto;
}

/* ---- 折叠状态 ---- */
.reasoning-block.collapsed {
    background: transparent;
    border-left-color: var(--border-color);
}

.reasoning-block.collapsed .reasoning-content {
    display: none;
}

.reasoning-block.collapsed .reasoning-header {
    opacity: 0.65;
}

/* ---- 思考中：标题旁呼吸的小圆点 ---- */
.reasoning-block.thinking .reasoning-title::after {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    margin-left: 6px;
    border-radius: 50%;
    background: var(--color-primary);
    animation: reasoningPulse 1s ease-in-out infinite;
}

@keyframes reasoningPulse {
    0%, 100% { opacity: 0.25; }
    50%      { opacity: 1; }
}

/* ================================================================
   可交互图表（plot_chart 工具 → 浏览器端 ECharts 渲染）
   ================================================================ */
.message.chart-message {
    max-width: 100%;
    width: 100%;
    padding: var(--space-sm);
    background: var(--bubble-assistant);
}

.chart-box {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 100%;
}

.chart-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 0 4px;
}

.chart-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    opacity: 0.85;
}

.chart-btn {
    font-size: 0.75rem;
    padding: 4px 10px;
    border: 1px solid var(--bubble-tool-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.chart-btn:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.chart-canvas {
    width: 100%;
    height: 360px;
    min-width: 0;
}

.chart-error {
    padding: 16px;
    font-size: 0.85rem;
    color: #b91c1c;
    background: #fef2f2;
    border-radius: var(--radius-sm);
}

@media (max-width: 640px) {
    .chart-canvas { height: 280px; }
}