/* 全局变量 */
:root {
    --primary-color: #3B82F6;
    --primary-hover: #2563EB;
    --secondary-color: #64748B;
    --success-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --background-color: #F1F5F9;
    --surface-color: #FFFFFF;
    --border-color: #E2E8F0;
    --text-primary: #1E293B;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.05);
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
}

/* 基础样式 */
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.5;
    font-size: 0.875rem;
}

.app-layout {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.container-fluid {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 面板容器 */
.panels-container {
    display: flex;
    flex: 1 1 auto;
    overflow: hidden;
    -webkit-overflow-scrolling: touch;
}

/* 面板布局 */
.panel {
    display: flex;
    flex-direction: column;
    flex: none;
    background-color: var(--surface-color);
    border-right: 1px solid var(--border-color);
    transition: all 0.2s ease;
    overflow: hidden;
}

/* 默认状态（展开）下的宽度设置 */
#paper-view,
#analysis-view,
#agent-view {
    width: 33.333%;
}

/* 当图谱面板收起时的样式 */
.graph-panel-collapsed #analysis-view {
    display: none;
}

.graph-panel-collapsed #paper-view,
.graph-panel-collapsed #agent-view {
    width: 50%;
}

/* 确保面板内容在收起状态下正确显示 */
.graph-panel-collapsed #paper-view,
.graph-panel-collapsed #agent-view {
    display: flex;
    visibility: visible;
    opacity: 1;
}

/* 统一面板头部样式 */
.panel-header {
    flex: 0 0 auto;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--surface-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 44px;
}

.panel-title {
    margin: 0;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.panel-title i {
    color: var(--primary-color);
    font-size: 0.75rem;
}

/* 统一header按钮样式 */
.panel-header .btn {
    height: 28px;
    padding: 0 12px;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    white-space: nowrap;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.panel-header .btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background-color: transparent;
}

.panel-header .btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: white;
}

/* 在小屏幕上统一按钮样式 */
@media (max-width: 1200px) {
    .panel-header .btn {
        width: 28px;
        padding: 0;
    }
    
    .panel-header .btn span {
        display: none;
    }
    
    .panel-header .btn i {
        margin: 0;
    }
}

/* 面板内容区域 */
.panel-content {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    padding: 16px;
    gap: 16px;
    background-color: var(--background-color);
    overflow: hidden;  /* 防止内容溢出 */
}

/* 内容卡片 */
.content-card {
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.content-card:hover {
    box-shadow: var(--shadow-md);
}

.content-card.scrollable {
    overflow-y: auto;
    flex: 1;
}

/* 上传区域 */
.upload-section {
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-sm);
}

.input-group {
    display: flex;
    gap: 8px;
    border-radius: var(--radius-sm);
}

/* 文件上传控件样式 */
.input-group input[type="file"] {
    position: relative;
    flex: 1;
    height: 32px;
    padding: 0;
    font-size: 0.75rem;
    background-color: var(--surface-color);
    transition: all 0.2s ease;
    cursor: pointer;
    overflow: hidden;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    color: transparent;  /* 隐藏原生文件名显示 */
}

.input-group input[type="file"]::-webkit-file-upload-button {
    height: 32px;
    line-height: 32px;
    padding: 0 12px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    background-color: var(--background-color);
    border: none;
    border-right: 1px solid var(--border-color);
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    margin: -1px;
    visibility: visible;  /* 确保按钮可见 */
}

.input-group input[type="file"]::file-selector-button {
    height: 32px;
    line-height: 32px;
    padding: 0 12px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    background-color: var(--background-color);
    border: none;
    border-right: 1px solid var(--border-color);
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    margin: -1px;
    visibility: visible;  /* 确保按钮可见 */
}

.input-group input[type="file"]::-webkit-file-upload-button:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.input-group input[type="file"]::file-selector-button:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.input-group input[type="file"]:hover {
    border-color: var(--primary-color);
}

.input-group input[type="file"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

/* 文件名显示区域 */
.input-group input[type="file"]::after {
    content: attr(data-file-name);
    position: absolute;
    left: calc(90px + 1rem);  /* 按钮宽度 + padding */
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: calc(100% - 120px);  /* 留出按钮和padding的空间 */
    pointer-events: none;  /* 防止干扰文件选择 */
}

.input-group input[type="file"]:not(:valid)::after {
    content: "未选择文件";
    color: var(--text-tertiary);
}

/* 上传按钮样式 */
.input-group .btn-upload {
    height: 32px;
    padding: 0 12px;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    cursor: pointer;
    background-color: var(--primary-color);
    color: white;
    min-width: 80px;
}

.input-group .btn-upload:hover {
    background-color: var(--primary-hover);
}

.input-group .btn-upload:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    opacity: 0.7;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .upload-section {
        padding: 12px;
    }

    .input-group input[type="file"],
    .input-group .btn-upload {
        height: 28px;
        font-size: 0.6875rem;
    }

    .input-group input[type="file"]::-webkit-file-upload-button,
    .input-group input[type="file"]::file-selector-button {
        height: 26px;
        padding: 0 8px;
        font-size: 0.6875rem;
    }

    .input-group input[type="file"]::after {
        left: calc(70px + 0.75rem);
        font-size: 0.6875rem;
        max-width: calc(100% - 100px);
    }
}

/* 按钮样式 */
.btn {
    height: 32px;
    padding: 0 12px;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background-color: transparent;
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: white;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* 分析区域 */
.analysis-section {
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    flex: 1;  /* 让分析区域占满剩余空间 */
    min-height: 0;  /* 允许内容区域收缩 */
}

#analysis-content {
    flex: 1;  /* 让内容区域占满剩余空间 */
    overflow-y: auto;  /* 内容过多时可滚动 */
    min-height: 0;  /* 允许内容区域收缩 */
}

.section-subtitle {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 0 0 auto;  /* 防止标题被压缩 */
}

.section-subtitle i {
    color: var(--primary-color);
    font-size: 0.875rem;
}

/* 图谱区域 */
#graph-content {
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;  /* 占满剩余空间 */
    min-height: 0;  /* 允许内容区域收缩 */
    overflow: hidden;  /* 防止内容溢出 */
}

.placeholder-content {
    text-align: center;
    color: var(--text-tertiary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: 24px;
}

.placeholder-content i {
    font-size: 1.5rem;
    margin-bottom: 8px;
    color: var(--text-tertiary);
}

.placeholder-content p {
    margin: 0;
    font-size: 0.75rem;
}

/* 加载动画 */
.loading-spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.graph-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* D3.js 图谱样式 */
.node circle {
    fill: var(--primary-color);
    stroke: white;
    stroke-width: 1.5px;
    transition: all 0.2s ease;
}

.node:hover circle {
    fill: var(--primary-hover);
}

.node text {
    font-size: 0.75rem;
    fill: var(--text-primary);
    font-weight: 500;
}

.link {
    stroke: var(--secondary-color);  /* 使用更深的颜色 */
    stroke-width: 1.5px;  /* 增加线条宽度 */
    opacity: 0.75;  /* 增加不透明度 */
}

/* 添加连线的悬停效果 */
.link:hover {
    stroke: var(--primary-color);
    stroke-width: 2px;
    opacity: 1;
}

/* 当节点被悬停时，相关的连线高亮 */
.node:hover + .link,
.link:hover {
    stroke: var(--primary-color);
    stroke-width: 2px;
    opacity: 1;
}

/* 确保图谱面板内容正确布局 */
#analysis-view .panel-content {
    display: flex;
    flex-direction: column;
    padding: 16px;
    gap: 16px;
    overflow: hidden;
    height: 100%;  /* 占满整个高度 */
}

/* 聊天控件 */
.chat-controls {
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 12px;
    box-shadow: var(--shadow-sm);
}

.chat-controls .input-group {
    display: flex;
    gap: 8px;
}

.chat-controls .input-group input[type="text"] {
    flex: 1;
    height: 32px;
    padding: 0 12px;
    font-size: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--surface-color);
}

.chat-controls .input-group .btn {
    height: 32px;
    padding: 0 12px;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .panel-header {
        height: 40px;
        padding: 8px 12px;
    }
    
    .panel-content {
        padding: 12px;
        gap: 12px;
    }
    
    .content-card,
    .upload-section,
    .analysis-section,
    .chat-controls {
        padding: 12px;
    }
    
    .btn,
    .btn-icon {
        height: 28px;
    }
    
    .input-group .form-control {
        height: 28px;
        padding: 0 8px;
    }
}

/* 图标按钮 */
.btn-icon {
    width: 28px;
    height: 28px;
    padding: 0;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    background-color: transparent;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background-color: rgba(59, 130, 246, 0.05);
}

.btn-icon i {
    font-size: 0.75rem;
}

.btn-icon.btn-sm {
    width: 24px;
    height: 24px;
    font-size: 0.6875rem;
}

.btn-icon.btn-sm i {
    font-size: 0.6875rem;
}

/* 图谱收起时的图标旋转 */
.graph-panel-collapsed .btn-icon i {
    transform: rotate(180deg);
}

/* 面板头部按钮组 */
.panel-header .d-flex {
    gap: 6px;
}

/* 恢复图谱按钮 */
.restore-graph-btn {
    position: fixed;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.restore-graph-btn .btn-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-right: none;
    box-shadow: var(--shadow-md);
}

.restore-graph-btn .btn-icon:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.restore-graph-btn .btn-icon i {
    font-size: 0.875rem;
}

.graph-panel-collapsed .restore-graph-btn {
    opacity: 1;
    visibility: visible;
}

/* 移动端优化 */
@media (max-width: 768px) {
    .panel-content,
    .panel-header {
        padding: 8px;
    }
    
    .btn,
    .btn-icon {
        height: 24px;
        font-size: 0.6875rem;
    }
    
    .panel-header {
        height: 40px;
    }
}

/* 文件信息 */
.file-info {
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 12px;
    box-shadow: var(--shadow-sm);
}

.file-info p {
    margin: 0;
    padding: 4px 0;
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.file-info strong {
    color: var(--text-primary);
    font-weight: 500;
    min-width: 80px;
}

/* 分析区域优化 */
.analysis-section {
    margin-top: 12px;
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
}

.section-subtitle {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.section-subtitle i {
    color: var(--primary-color);
    font-size: 0.875rem;
}

/* 分析内容样式 */
.analysis-content {
    font-size: 0.75rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.analysis-content p {
    margin-bottom: 8px;
}

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