/* ========== 全局样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a90d9;
    --primary-hover: #3a7bc8;
    --success-color: #52c41a;
    --success-hover: #47a817;
    --danger-color: #ff6b6b;
    --danger-hover: #ee5a5a;
    --warning-color: #faad14;
    --text-color: #333;
    --text-secondary: #666;
    --text-light: #999;
    --bg-color: #f5f7fa;
    --bg-white: #fff;
    --border-color: #e4e7ed;
    --border-light: #ebeef5;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --start-color: #52c41a;
    --process-color: #4a90d9;
    --decision-color: #faad14;
    --end-color: #ff6b6b;
    --sidebar-width: 240px;
    --toolbar-height: 60px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* ========== 顶部工具栏 ========== */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--toolbar-height);
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 0 20px;
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.toolbar-left .app-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-color);
    white-space: nowrap;
}

.save-status {
    font-size: 12px;
    font-weight: 500;
    color: var(--success-color);
    padding: 4px 10px;
    background-color: #f6ffed;
    border: 1px solid #b7eb8f;
    border-radius: 12px;
    white-space: nowrap;
    transition: all 0.3s ease;
    cursor: default;
    user-select: none;
}

.toolbar-center {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 4px;
}

.tool-divider {
    width: 1px;
    height: 28px;
    background-color: var(--border-color);
    margin: 0 8px;
}

.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6px 12px;
    min-width: 56px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-white);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 11px;
    color: var(--text-color);
    gap: 2px;
}

.tool-btn:hover {
    background-color: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

.tool-btn .icon {
    font-size: 16px;
    line-height: 1;
}

.tool-btn .label {
    font-size: 11px;
    font-weight: 500;
}

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

.tool-btn.primary:hover {
    background-color: #d48806;
    border-color: #d48806;
}

.tool-btn.success {
    background-color: var(--success-color);
    color: #fff;
    border-color: var(--success-color);
}

.tool-btn.success:hover {
    background-color: var(--success-hover);
    border-color: var(--success-hover);
}

.toolbar-right {
    display: flex;
    gap: 8px;
}

/* ========== 主内容区 ========== */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ========== 左侧面板 ========== */
.sidebar-left {
    width: var(--sidebar-width);
    background-color: var(--bg-white);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.panel-header {
    padding: 16px 16px 12px;
    border-bottom: 1px solid var(--border-light);
}

.panel-header h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color);
}

.node-templates {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.template-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    cursor: grab;
    transition: all 0.2s ease;
    background-color: #fafbfc;
}

.template-item:hover {
    border-color: var(--primary-color);
    background-color: #eaf4ff;
    transform: translateX(2px);
}

.template-item:active {
    cursor: grabbing;
}

.template-node {
    width: 60px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 500;
    color: #fff;
    flex-shrink: 0;
}

.template-node.start-node {
    background-color: var(--start-color);
    border-radius: 18px;
}

.template-node.process-node {
    background-color: var(--process-color);
    border-radius: 4px;
}

.template-node.decision-node {
    background-color: var(--decision-color);
    transform: rotate(45deg);
    width: 32px;
    height: 32px;
    font-size: 10px;
}

.template-node.decision-node span {
    transform: rotate(-45deg);
}

.template-node.end-node {
    background-color: var(--end-color);
    border-radius: 18px;
}

.template-item span:last-child {
    font-size: 13px;
    color: var(--text-secondary);
}

.instructions {
    padding: 12px 16px;
    font-size: 12px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.instructions p {
    margin-bottom: 6px;
}

.instructions strong {
    color: var(--primary-color);
}

/* ========== 画布区域 ========== */
.canvas-area {
    flex: 1;
    overflow: auto;
    background-color: #f0f2f5;
    background-image: 
        linear-gradient(rgba(200, 200, 200, 0.3) 1px, transparent 1px),
        linear-gradient(90deg, rgba(200, 200, 200, 0.3) 1px, transparent 1px);
    background-size: 20px 20px;
    position: relative;
}

.canvas-wrapper {
    position: relative;
    min-width: 3000px;
    min-height: 2000px;
    width: 100%;
    height: 100%;
}

.connections-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* 连线组：允许接收事件 */
.connections-layer g.connection-group {
    pointer-events: auto;
}

/* 透明点击区域：宽路径，容易点中 */
.connection-hit-area {
    fill: none;
    stroke: transparent;
    stroke-width: 20;
    pointer-events: stroke;
    cursor: pointer;
}

/* 可见连线 */
.connection-path {
    fill: none;
    pointer-events: none;
}

/* 中点箭头 */
.connection-arrow {
    pointer-events: none;
}

.temp-connection-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
}

.nodes-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none; /* 空白区域不拦截事件，让连线可被点击 */
}

/* 节点本身恢复事件接收 */
.flow-node {
    pointer-events: auto;
}

/* ========== 流程节点 ========== */
.flow-node {
    position: absolute;
    min-width: 120px;
    padding: 12px 16px;
    border-radius: 6px;
    cursor: move;
    user-select: none;
    transition: box-shadow 0.2s ease, transform 0.1s ease;
    color: #fff;
    font-size: 13px;
    font-weight: 500;
    text-align: center;
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.flow-node:hover {
    box-shadow: var(--shadow-md);
    z-index: 20;
}

.flow-node.selected {
    outline: 3px solid var(--danger-color);
    outline-offset: 2px;
    z-index: 30;
}

.flow-node.connect-source {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    z-index: 25;
}

.flow-node.connect-target-hover {
    outline: 3px dashed var(--success-color);
    outline-offset: 2px;
}

.flow-node.start-node {
    background: linear-gradient(135deg, #52c41a, #389e0d);
    border-radius: 24px;
    padding: 12px 28px;
}

.flow-node.process-node {
    background: linear-gradient(135deg, #4a90d9, #3167b4);
    border-radius: 8px;
}

.flow-node.decision-node {
    background: transparent;
    width: 100px;
    height: 100px;
    min-width: 100px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
}

/* 用伪元素+clip-path绘制菱形，避免transform旋转导致端口位置错乱 */
.flow-node.decision-node::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #faad14, #d48806);
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    z-index: 0;
    box-shadow: var(--shadow-sm);
}

/* 判断节点自定义颜色：覆盖伪元素背景 */
.flow-node.decision-node.custom-color::before {
    background: var(--node-custom-color, linear-gradient(135deg, #faad14, #d48806));
}

.flow-node.decision-node:hover::before {
    box-shadow: var(--shadow-md);
}

.flow-node.decision-node .node-content {
    width: 80px;
    word-break: break-all;
    line-height: 1.3;
    position: relative;
    z-index: 1;
}

.flow-node.end-node {
    background: linear-gradient(135deg, #ff6b6b, #d4380d);
    border-radius: 24px;
    padding: 12px 28px;
}

.node-content {
    pointer-events: none;
}

.node-title {
    font-weight: 600;
    margin-bottom: 4px;
}

.node-comment {
    font-size: 11px;
    opacity: 0.9;
    font-weight: normal;
    line-height: 1.4;
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* 节点连接点 */
.node-port {
    position: absolute;
    width: 18px;
    height: 18px;
    background-color: var(--bg-white);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    z-index: 20;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
    pointer-events: auto;
    cursor: crosshair;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.flow-node:hover .node-port,
.flow-node.connect-source .node-port,
.connect-mode-active .node-port {
    opacity: 1;
}

.node-port:hover {
    background-color: var(--success-color);
    border-color: var(--success-color);
    transform: scale(1.35);
    box-shadow: 0 0 0 4px rgba(82, 196, 26, 0.2);
}

/* 端口位置 */
.node-port.top {
    top: -9px;
    left: 50%;
    margin-left: -9px;
}

.node-port.bottom {
    bottom: -9px;
    left: 50%;
    margin-left: -9px;
}

.node-port.left {
    left: -9px;
    top: 50%;
    margin-top: -9px;
}

.node-port.right {
    right: -9px;
    top: 50%;
    margin-top: -9px;
}

/* 端口方向标签（hover时显示） */
.node-port::after {
    content: attr(data-port-label);
    position: absolute;
    top: -22px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    color: var(--text-secondary);
    background: var(--bg-white);
    padding: 1px 6px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
}

.node-port:hover::after {
    opacity: 1;
}

/* ========== 连线 ========== */
/* 可见连线（上方新增了 fill:none; pointer-events:none 的基础规则） */
.connection-path {
    stroke: var(--primary-color);
    stroke-width: 2.5;
    stroke-linecap: round;
    transition: stroke 0.2s ease, stroke-width 0.2s ease;
}

.connection-group:hover .connection-path {
    stroke-width: 3.5;
    stroke: #2a6ab5;
}

.connection-path.selected {
    stroke: var(--danger-color);
    stroke-width: 3.5;
    filter: drop-shadow(0 0 4px rgba(255, 107, 107, 0.5));
}

.connection-label {
    position: absolute;
    background-color: var(--bg-white);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 12;
    cursor: pointer;
    pointer-events: auto;
    white-space: nowrap;
    transform: translate(-50%, -50%);
}

.connection-label:hover {
    border-color: var(--primary-color);
    background-color: #eaf4ff;
}

.connection-label.selected {
    border-color: var(--danger-color);
    background-color: #fff1f0;
    color: var(--danger-color);
}

/* ========== 右侧面板 ========== */
.sidebar-right {
    width: var(--sidebar-width);
    background-color: var(--bg-white);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.property-panel {
    padding: 16px;
    flex: 1;
}

.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 200px;
    color: var(--text-light);
    font-size: 13px;
    text-align: center;
}

.property-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.property-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.property-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.property-group input,
.property-group textarea,
.property-group select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    font-family: inherit;
    transition: border-color 0.2s ease;
    background-color: #fafbfc;
}

.property-group input:focus,
.property-group textarea:focus,
.property-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

.property-group textarea {
    resize: vertical;
    min-height: 80px;
    line-height: 1.6;
}

.property-info {
    padding: 12px;
    background-color: #f6f8fa;
    border-radius: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.property-info .info-item {
    display: flex;
    justify-content: space-between;
}

.property-info .info-item span:first-child {
    color: var(--text-light);
}

.property-actions {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.property-actions button {
    flex: 1;
}

/* ========== 弹窗 ========== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--bg-white);
    border-radius: 12px;
    width: 480px;
    max-width: 90vw;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.25s ease;
    overflow: hidden;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background-color: #f0f0f0;
    color: var(--text-color);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-light);
    background-color: #fafbfc;
}

.form-group {
    margin-bottom: 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s ease;
    background-color: #fafbfc;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

.form-group textarea {
    resize: vertical;
    line-height: 1.6;
}

/* ========== 按钮 ========== */
.btn {
    padding: 8px 20px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    font-family: inherit;
}

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

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

.btn-secondary {
    background-color: var(--bg-white);
    color: var(--text-color);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background-color: #f5f5f5;
}

.btn-danger {
    background-color: var(--danger-color);
    color: #fff;
    border-color: var(--danger-color);
}

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

.btn-sm {
    padding: 4px 12px;
    font-size: 12px;
}

/* ========== 提示消息 ========== */
.toast-container {
    position: fixed;
    top: 80px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    padding: 12px 20px;
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary-color);
    font-size: 13px;
    color: var(--text-color);
    min-width: 240px;
    animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
    pointer-events: auto;
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* ========== 连接模式提示 ========== */
.connect-mode-banner {
    position: fixed;
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: #fff;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    z-index: 500;
    animation: pulse 1.5s ease infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: var(--shadow-md); }
    50% { box-shadow: 0 4px 20px rgba(74, 144, 217, 0.5); }
}

.connect-mode-banner .tip {
    opacity: 0.85;
    margin-left: 12px;
    font-weight: normal;
    font-size: 12px;
}

/* ========== 打印样式（浏览器原生打印"另存为PDF"） ========== */
@media print {
    @page {
        size: auto;
        margin: 10mm;
    }
    
    html, body {
        background-color: #fff !important;
        overflow: visible !important;
        height: auto !important;
        width: auto !important;
    }

    .toolbar,
    .sidebar-left,
    .sidebar-right,
    .toast-container,
    .connect-mode-banner,
    .modal-overlay,
    .save-status {
        display: none !important;
    }

    .app-container {
        height: auto !important;
        display: block !important;
    }

    .main-content {
        overflow: visible !important;
        display: block !important;
    }

    .canvas-area {
        overflow: visible !important;
        background-image: none !important;
        background-color: #fff !important;
        width: 100% !important;
        display: block !important;
    }

    .canvas-wrapper {
        position: relative !important;
        min-width: 0 !important;
        min-height: 0 !important;
        width: auto !important;
        height: auto !important;
        overflow: visible !important;
        /* 动态平移让内容贴近页边距，不依赖JS裁剪 */
        transform: none !important;
    }

    /* 隐藏画布以外的多余空间 */
    .nodes-layer,
    .connections-layer,
    .temp-connection-layer {
        overflow: visible !important;
    }

    .flow-node {
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15) !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
        break-inside: avoid;
        page-break-inside: avoid;
    }

    .connection-path {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
        stroke-width: 2 !important;
    }

    .connection-label {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
        box-shadow: none !important;
    }

    .flow-node.selected {
        outline: none !important;
    }

    .node-port {
        display: none !important;
    }
}

/* ========== 滚动条样式 ========== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background-color: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background-color: #c1c1c1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: #a8a8a8;
}

/* ========== 多选框选框 ========== */
.selection-box {
    position: absolute;
    border: 1px dashed var(--primary-color);
    background-color: rgba(74, 144, 217, 0.1);
    z-index: 50;
    pointer-events: none;
}

/* ========== 节点颜色选择器 ========== */
.color-picker {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.color-swatches {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 6px;
}

.color-swatch {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 6px;
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all 0.15s ease;
    padding: 0;
    position: relative;
}

.color-swatch:hover {
    transform: scale(1.1);
    border-color: var(--text-secondary);
}

.color-swatch.active {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 2px rgba(255, 107, 107, 0.3);
    transform: scale(1.1);
}

.color-swatch.active::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    font-size: 12px;
    font-weight: bold;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.color-custom {
    display: flex;
    align-items: center;
    gap: 8px;
}

.color-custom input[type="color"] {
    width: 40px;
    height: 32px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    background-color: var(--bg-white);
}

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

.color-custom .btn {
    flex: 1;
}

/* ========== 属性面板宽度调整 ========== */
.panel-resizer {
    width: 6px;
    background-color: transparent;
    cursor: col-resize;
    position: relative;
    flex-shrink: 0;
    z-index: 50;
    transition: background-color 0.2s ease;
}

.panel-resizer::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 2px;
    height: 40px;
    background-color: var(--border-color);
    border-radius: 1px;
    transition: background-color 0.2s ease;
}

.panel-resizer:hover,
.panel-resizer.dragging {
    background-color: rgba(74, 144, 217, 0.1);
}

.panel-resizer:hover::before,
.panel-resizer.dragging::before {
    background-color: var(--primary-color);
    height: 60px;
}

.sidebar-right {
    flex-shrink: 0;
}