:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --sidebar-bg: #ffffff;
    --sidebar-text: #1e293b;
    --node-bg: #ffffff;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body, html {
    height: 100%;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    overflow: hidden;
}

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

/* Header Toolbar */
#toolbar {
    height: 60px;
    background-color: white;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 8px;
    z-index: 1100;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

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

.toolbar-separator {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 8px;
}

#toolbar .tool-btn {
    height: 40px;
    padding: 0 12px;
    border: 1px solid transparent;
    background: transparent;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    color: #475569;
}

#toolbar .tool-btn svg {
    width: 18px;
    height: 18px;
}

#toolbar .tool-btn span {
    font-size: 9px;
    font-weight: 600;
    margin-top: 2px;
}

#toolbar .tool-btn:hover {
    background-color: #f1f5f9;
    color: var(--primary-color);
}

#toolbar .tool-btn.active {
    background-color: #eff6ff;
    color: var(--primary-color);
    border-color: #bfdbfe;
}

#toolbar .tool-btn.success {
    color: #10b981;
}
#toolbar .tool-btn.success:hover { background-color: #ecfdf5; }

#toolbar .tool-btn.danger {
    color: #ef4444;
}
#toolbar .tool-btn.danger:hover { background-color: #fef2f2; }

.simulate-btn {
    background-color: white !important;
    color: #4f46e5 !important;
    border: 1px solid #e2e8f0 !important;
}
.simulate-btn:hover { background-color: #f8fafc !important; }

.simulate-btn.active {
    background-color: #4f46e5 !important;
    color: white !important;
    border-color: #4f46e5 !important;
    box-shadow: 0 0 10px rgba(79, 70, 229, 0.4);
}
.simulate-btn.active:hover { background-color: #4338ca !important; }

.zoom-controls {
    background: #f8fafc;
    padding: 4px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

#zoom-label {
    font-size: 12px;
    font-weight: 700;
    min-width: 45px;
    text-align: center;
    color: #64748b;
}

.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* Floating Toolbox Adjustments */
.sidebar {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 70px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    padding: 10px 0;
}

.sidebar-header {
    display: none; /* Hide header for compact look */
}

.toolbox {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 0 8px;
}

.toolbox-item {
    width: 54px;
    height: 54px;
    background-color: transparent;
    border-radius: 8px;
    text-align: center;
    cursor: grab;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.toolbox-item:hover {
    background-color: #f1f5f9;
    color: var(--primary-color);
}

.toolbox-item i {
    font-size: 20px;
    margin-bottom: 4px;
}

.toolbox-item span {
    font-size: 9px;
    font-weight: 500;
}

.sidebar-footer {
    margin-top: 10px;
    padding: 10px 8px 0;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tool-btn {
    width: 54px;
    height: 54px;
    border: none;
    border-radius: 8px;
    background-color: transparent;
    color: var(--sidebar-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.tool-btn:hover {
    background-color: #f1f5f9;
}

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

.tool-btn.danger:hover {
    background-color: #fee2e2;
    color: var(--danger-color);
}

/* Workspace Grid */
.workspace {
    flex: 1;
    background-color: var(--bg-color);
    position: relative;
    overflow: hidden;
    background-image: 
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 30px 30px;
}

.canvas-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 5000px;
    height: 5000px;
    transform-origin: 0 0;
}

.canvas-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.canvas-svg line {
    stroke: #94a3b8;
    stroke-width: 2;
    stroke-dasharray: 4;
}

@keyframes dash-flow {
    to {
        stroke-dashoffset: -24;
    }
}

@keyframes particle-flow {
    from {
        offset-distance: 0%;
    }
    to {
        offset-distance: 100%;
    }
}

.simulating-link {
    filter: drop-shadow(0 0 2px rgba(0,0,0,0.2));
}

.load-particle {
    filter: drop-shadow(0 0 2px rgba(0,0,0,0.3));
    stroke: #334155;
    stroke-width: 1px;
}

.traffic-label {
    font-size: 11px;
    font-weight: 800;
    fill: #2563eb;
    pointer-events: none;
    user-select: none;
    paint-order: stroke;
    stroke: white;
    stroke-width: 3px;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.port-label {
    font-size: 10px;
    fill: #334155;
    font-weight: 700;
    pointer-events: none;
    user-select: none;
    paint-order: stroke;
    stroke: white;
    stroke-width: 3px;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* Drawing Layer & Shapes */
.drawing-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.shape {
    position: absolute;
    border: 2px solid #94a3b8;
    background-color: rgba(148, 163, 184, 0.1);
    pointer-events: all;
    cursor: move;
    display: flex;
    min-width: 20px;
    min-height: 20px;
    transition: outline 0.2s;
    border-radius: 12px;
}

.shape-text {
    pointer-events: none;
    user-select: none;
    font-size: 14px;
    color: #1e293b;
    font-weight: 500;
}

.shape.rect { border-radius: 4px; }
.shape.circle { border-radius: 50%; }
.shape.diamond { transform: rotate(45deg); }
.shape.diamond .shape-text { transform: rotate(-45deg); }
.shape.group {
    background-color: rgba(37, 99, 235, 0.05);
    border-color: #3b82f6;
}

.shape.selected {
    outline: 2px solid var(--primary-color);
    outline-offset: 4px;
}

/* Resize Handles */
.resizer {
    position: absolute;
    width: 8px;
    height: 8px;
    background: white;
    border: 1px solid var(--primary-color);
    z-index: 10;
    display: none;
}

.shape.selected .resizer {
    display: block;
}

.resizer.tl { top: -4px; left: -4px; cursor: nw-resize; }
.resizer.tr { top: -4px; right: -4px; cursor: ne-resize; }
.resizer.bl { bottom: -4px; left: -4px; cursor: sw-resize; }
.resizer.br { bottom: -4px; right: -4px; cursor: se-resize; }

/* Context Menu Property Inputs */
.menu-props {
    padding: 8px 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    border-top: 1px solid var(--border-color);
}

.prop-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
}

.prop-row input {
    width: 60px;
}

/* Node Styles - Professional Look */
.node {
    position: absolute;
    width: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: move;
    user-select: none;
    padding: 10px;
    border-radius: 8px;
    transition: background 0.2s;
}

.node:hover {
    background-color: rgba(37, 99, 235, 0.05);
}

.node.selected {
    background-color: rgba(37, 99, 235, 0.1);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.node-icon {
    width: 64px;
    height: 64px;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #334155;
    box-shadow: var(--shadow);
    margin-bottom: 8px;
    position: relative;
}

.node-icon img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
}

.role-badge {
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    background: #64748b;
    color: white;
    font-size: 8px;
    font-weight: 800;
    padding: 2px 6px;
    border-radius: 4px;
    white-space: nowrap;
    border: 1px solid white;
    z-index: 5;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Icon Selection Grid in Properties */
.icon-grid-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 8px;
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 8px;
    background: #ffffff;
    max-height: 400px;
    overflow-y: auto;
}

.icon-cat-label {
    font-size: 11px;
    font-weight: 800;
    color: #64748b;
    border-bottom: 1px solid #f1f5f9;
    padding-bottom: 4px;
    margin-bottom: 4px;
}

.icon-thumb-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 12px;
}

.icon-thumb-wrap {
    aspect-ratio: 1;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 4px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8fafc;
}

.icon-thumb-wrap:hover {
    border-color: var(--primary-color);
    background: #eff6ff;
}

.icon-thumb-wrap.active {
    border-color: var(--primary-color);
    background: #dbeafe;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.icon-thumb {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.btn-reset-icon {
    width: 100%;
    padding: 8px;
    font-size: 12px;
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: #475569;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
}

.btn-reset-icon:hover {
    background: #e2e8f0;
    color: #1e293b;
}

.node-label {
    font-size: 13px;
    font-weight: 600;
    color: #475569;
    text-align: center;
    background: transparent;
    border: none;
    width: 100%;
    outline: none;
}

.node-ip {
    font-size: 11px;
    color: #64748b;
    text-align: center;
    margin-top: 2px;
    font-family: 'Courier New', Courier, monospace;
    font-weight: 700;
}

.node-labels {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Port Selection Popup (Floating) */
.modal {
    position: fixed;
    background: white;
    padding: 12px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    z-index: 2000;
    width: 200px;
    display: flex;
    flex-direction: column;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal-content, .sim-modal-box {
    background: white;
    padding: 24px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 500px;
    position: relative;
}

.context-menu {
    position: fixed;
    background: white;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    z-index: 1000;
    min-width: 180px;
    padding: 4px;
}

.context-menu ul {
    list-style: none;
}

.context-menu li {
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #334155;
}

.context-menu li:hover {
    background-color: #f1f5f9;
}

.context-menu li.danger {
    color: var(--danger-color);
}

.menu-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 4px 0;
}

/* Node States */
.node.started .node-icon {
    border: 2px solid #22c55e;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.3);
}

.node.started .node-icon::after {
    content: '';
    position: absolute;
    top: 2px;
    right: 2px;
    width: 10px;
    height: 10px;
    background-color: #22c55e;
    border-radius: 50%;
    border: 2px solid white;
}

.node.stopped .node-icon::after {
    content: '';
    position: absolute;
    top: 2px;
    right: 2px;
    width: 10px;
    height: 10px;
    background-color: #ef4444;
    border-radius: 50%;
    border: 2px solid white;
}

/* Inventory Status */
.inventory-item .status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 8px;
}

.status-indicator.started { background-color: #22c55e; }
.status-indicator.stopped { background-color: #ef4444; }

.inventory-item .item-header {
    display: flex;
    align-items: center;
}

.modal-content {
    background: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    border: none;
    width: 100%;
}

.modal-content h3 {
    font-size: 13px;
    margin-bottom: 8px;
    color: #64748b;
    text-align: center;
}

.port-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
    margin: 0 0 10px 0;
}

.port-item {
    padding: 6px;
    font-size: 11px;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.port-item:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Configuration Modal */
.config-group {
    margin: 20px 0;
}

.config-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #64748b;
    margin-bottom: 8px;
}

.port-counter {
    display: flex;
    align-items: center;
    gap: 10px;
}

.port-counter button {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 6px;
    cursor: pointer;
}

.port-counter input {
    width: 60px;
    height: 32px;
    text-align: center;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-weight: bold;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

.modal-footer button {
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    cursor: pointer;
}

.modal-footer button.success {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Simulation Modal New Styles */
.sim-modal-box {
    width: 100%;
    max-width: 500px;
}

.sim-modal-title {
    font-size: 18px;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 20px;
    text-align: center;
}

.sim-modal-row {
    margin-bottom: 15px;
}

.sim-modal-label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: #64748b;
    margin-bottom: 6px;
}

.sim-modal-input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
}

.sim-modal-input:focus {
    border-color: var(--primary-color);
}

.sim-spec-section {
    margin-top: 20px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.sim-spec-title {
    font-size: 14px;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 12px;
}

.sim-spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
}

.sim-spec-table th {
    text-align: left;
    padding: 8px;
    background: #f8fafc;
    color: #64748b;
    border-bottom: 1px solid var(--border-color);
}

.sim-spec-table td {
    padding: 8px;
    border-bottom: 1px solid #f1f5f9;
}

.sim-spec-table input {
    width: 60px;
    padding: 4px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.sim-modal-actions {
    margin-top: 25px;
    display: flex;
    gap: 10px;
}

.sim-modal-btn {
    flex: 1;
    padding: 12px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: white;
    transition: all 0.2s;
}

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

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

/* Inventory Sidebar (Right - Tabbed) */
.inventory-sidebar {
    width: 350px;
    background-color: var(--sidebar-bg);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    box-shadow: -2px 0 5px rgba(0,0,0,0.05);
}

.sidebar-tabs {
    display: flex;
    background: #f1f5f9;
    padding: 4px;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-tab {
    flex: 1;
    padding: 10px;
    border: none;
    background: transparent;
    font-size: 13px;
    font-weight: 600;
    color: #64748b;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
}

.sidebar-tab:hover {
    background: rgba(0,0,0,0.05);
}

.sidebar-tab.active {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.tab-content {
    display: none;
    flex: 1;
    flex-direction: column;
    overflow: hidden;
}

.tab-content.active {
    display: flex;
}

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

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

.inventory-sidebar .sidebar-header {
    display: flex;
    flex-direction: column;
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    background: #f8fafc;
}

.property-editor {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.property-group {
    margin-bottom: 20px;
}

.property-row {
    display: flex;
    gap: 12px;
}

.property-row .property-group {
    flex: 1;
}

.property-group label {
    display: block;
    font-size: 11px;
    font-weight: 700;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.property-group input[type="text"],
.property-group input[type="number"] {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    color: #1e293b;
    outline: none;
    transition: border-color 0.2s;
}

.property-group input:focus {
    border-color: var(--primary-color);
}

.property-empty {
    padding-top: 60px;
}

/* Port Counter in Properties */
.prop-port-counter {
    display: flex;
    align-items: center;
    gap: 8px;
}

.prop-port-counter button {
    width: 28px;
    height: 28px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 4px;
    cursor: pointer;
}

.prop-port-counter input {
    flex: 1;
    text-align: center;
}

/* Existing Sidebar Styles Cleanup */
.inventory-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.inventory-item {
    display: flex;
    align-items: center;
    padding: 12px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    gap: 10px;
}

.inventory-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}

.inventory-item i {
    font-size: 18px;
    color: #64748b;
    width: 24px;
    text-align: center;
}

.inventory-item .item-info {
    flex: 1;
}

.inventory-item .item-name {
    font-size: 13px;
    font-weight: 600;
    color: #1e293b;
    display: block;
}

.inventory-item .item-type {
    font-size: 10px;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.inventory-metrics-box {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-left: auto;
    border-left: 1px solid var(--border-color);
    padding-left: 12px;
}

.metric-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 10px;
    font-weight: 700;
}

.metric-row .label {
    color: #94a3b8;
    width: 24px;
}

.metric-row .count {
    color: #64748b;
    background: #f1f5f9;
    padding: 1px 4px;
    border-radius: 3px;
    min-width: 28px;
    text-align: center;
}

.metric-row .usage {
    color: #22c55e;
    min-width: 32px;
    text-align: right;
}

.metric-row .usage.danger {
    color: #ef4444;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: #94a3b8;
    font-size: 13px;
    font-style: italic;
}

/* Node Resource Usage Bars */
.node-usage-container {
    position: absolute;
    top: -30px;
    width: 80px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.usage-bar-wrap {
    width: 100%;
}

.usage-label {
    font-size: 8px;
    font-weight: 800;
    color: #475569;
    text-align: left;
    margin-bottom: 1px;
    display: flex;
    justify-content: space-between;
}

.usage-bar {
    width: 100%;
    height: 4px;
    background: #e2e8f0;
    border-radius: 2px;
    overflow: hidden;
    border: 0.5px solid #cbd5e1;
}

.usage-fill {
    height: 100%;
    background: #22c55e;
    transition: width 0.3s ease, background 0.3s ease;
}

.usage-fill.danger {
    background: #ef4444;
}

.inventory-item.active {
    background: #eff6ff;
    border-color: var(--primary-color);
}