:root {
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --bg-panel-hover: #334155;
    --border-color: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --purple-color: #8b5cf6;
    --pink-color: #ec4899;

    --buffer-bg: #1e293b;
    --buffer-border: #3b82f6;
    --ddmrp-border: #06b6d4;
    --process-bg: #1e293b;
    --process-border: #10b981;
    --limiter-bg: #1e293b;
    --limiter-border: #f59e0b;
    --source-bg: #1e293b;
    --source-border: #8b5cf6;
    --sink-bg: #1e293b;
    --sink-border: #ec4899;

    --canvas-bg: #090d16;
    --grid-line: rgba(255, 255, 255, 0.05);
}

.light-theme {
    --bg-dark: #f8fafc;
    --bg-panel: #ffffff;
    --bg-panel-hover: #f1f5f9;
    --border-color: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    --canvas-bg: #f1f5f9;
    --grid-line: rgba(0, 0, 0, 0.06);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    user-select: none;
}

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-dark);
    color: var(--text-primary);
}

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

/* Header & Top Bar */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
    height: 60px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-icon {
    width: 28px;
    height: 28px;
    color: var(--primary-color);
}

.brand-text h1 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
}

.brand-text span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.sim-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background-color: rgba(0, 0, 0, 0.15);
    padding: 0.35rem 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.control-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 0.25rem;
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.speed-control input[type="range"] {
    width: 80px;
    cursor: pointer;
}

.sim-stats {
    display: flex;
    gap: 1rem;
    margin-left: 0.5rem;
}

.stat-box {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.stat-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 0.9rem;
    font-weight: 600;
    font-mono: monospace;
    color: var(--text-primary);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Buttons & Inputs */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.45rem 0.85rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s ease;
}

.btn i {
    width: 16px;
    height: 16px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}
.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--bg-panel-hover);
    color: var(--text-primary);
    border-color: var(--border-color);
}
.btn-secondary:hover:not(:disabled) {
    background-color: var(--border-color);
}

.btn-danger {
    background-color: rgba(239, 68, 68, 0.15);
    color: var(--danger-color);
    border-color: rgba(239, 68, 68, 0.3);
}
.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-color);
    color: white;
}

.btn-icon {
    padding: 0.45rem;
    background-color: var(--bg-panel-hover);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
.btn-icon:hover:not(:disabled) {
    color: var(--text-primary);
    background-color: var(--border-color);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.select-input {
    padding: 0.45rem 0.75rem;
    border-radius: 6px;
    background-color: var(--bg-panel-hover);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
}

/* Workspace Layout */
.workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* Sidebar Components Palette */
.sidebar {
    width: 280px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 5;
    overflow-y: auto;
}

.sidebar-header {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h3 {
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sidebar-header h3 i {
    width: 16px;
    height: 16px;
}

.palette-list {
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.palette-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem;
    background-color: var(--bg-panel-hover);
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    cursor: grab;
    transition: all 0.2s ease;
}

.palette-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.palette-icon {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.buffer-color { background-color: rgba(59, 130, 246, 0.2); color: var(--primary-color); border: 1px solid var(--primary-color); }
.ddmrp-color { background-color: rgba(6, 182, 212, 0.2); color: var(--ddmrp-border); border: 1px solid var(--ddmrp-border); }
.process-color { background-color: rgba(16, 185, 129, 0.2); color: var(--success-color); border: 1px solid var(--success-color); }
.limiter-color { background-color: rgba(245, 158, 11, 0.2); color: var(--warning-color); border: 1px solid var(--warning-color); }
.source-color { background-color: rgba(139, 92, 246, 0.2); color: var(--purple-color); border: 1px solid var(--purple-color); }
.sink-color { background-color: rgba(236, 72, 153, 0.2); color: var(--pink-color); border: 1px solid var(--pink-color); }

.palette-info {
    display: flex;
    flex-direction: column;
}

.palette-info strong {
    font-size: 0.85rem;
    color: var(--text-primary);
}

.palette-info small {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.help-box {
    padding: 0.85rem 1rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.help-box ul {
    list-style-type: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.help-box li {
    line-height: 1.3;
}

/* Canvas Area */
.canvas-area {
    flex: 1;
    position: relative;
    background-color: var(--canvas-bg);
    background-image: 
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 24px 24px;
    overflow: hidden;
    cursor: grab;
}

.canvas-area:active {
    cursor: grabbing;
}

.canvas-viewport {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: 0 0;
}

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

.svg-layer g {
    pointer-events: auto;
}

.wire-hit {
    fill: none;
    stroke: transparent;
    stroke-width: 20;
    cursor: pointer;
    pointer-events: stroke;
}

.wire-group {
    cursor: pointer;
}

.wire-group:hover .wire {
    stroke: var(--primary-color);
    stroke-width: 4;
}

.wire-delete-badge {
    cursor: pointer;
}

.wire {
    fill: none;
    stroke: #64748b;
    stroke-width: 2.5;
    stroke-linecap: round;
    cursor: pointer;
    transition: stroke 0.2s ease, stroke-width 0.2s ease;
}

.wire:hover {
    stroke: var(--primary-color);
    stroke-width: 4;
}

.wire.selected {
    stroke: var(--primary-color);
    stroke-width: 3.5;
    stroke-dasharray: 6 3;
}

.wire.active {
    stroke: var(--primary-color);
    stroke-width: 3;
}

.wire.dragging {
    stroke: var(--primary-color);
    stroke-width: 2.5;
    stroke-dasharray: 4 4;
}

.particle {
    fill: var(--primary-color);
    filter: drop-shadow(0 0 3px var(--primary-color));
    pointer-events: none;
}

.particle-scrap {
    fill: var(--warning-color);
    filter: drop-shadow(0 0 3px var(--warning-color));
    pointer-events: none;
}

.nodes-layer {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    pointer-events: none;
}

/* Node Elements */
.sim-node {
    position: absolute;
    pointer-events: auto;
    background-color: var(--bg-panel);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    min-width: 160px;
    display: flex;
    flex-direction: column;
    cursor: move;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.sim-node:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
}

.sim-node.selected {
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3), 0 8px 25px rgba(0, 0, 0, 0.5);
}

.sim-node.node-buffer { border-color: var(--buffer-border); }
.sim-node.node-ddmrp_buffer { border-color: var(--ddmrp-border); }
.sim-node.node-process { border-color: var(--process-border); }
.sim-node.node-limiter { border-color: var(--limiter-border); }
.sim-node.node-source { border-color: var(--source-border); }
.sim-node.node-sink { border-color: var(--sink-border); }

.node-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.03);
    border-radius: 8px 8px 0 0;
}

.node-title {
    font-size: 0.82rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.node-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #64748b;
}

.node-status-dot.active { background-color: var(--success-color); box-shadow: 0 0 6px var(--success-color); }
.node-status-dot.starved { background-color: var(--warning-color); }
.node-status-dot.blocked { background-color: var(--danger-color); }

.node-body {
    padding: 0.6rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    font-size: 0.75rem;
}

.node-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Level Bar for Buffers */
.level-bar-container {
    width: 100%;
    height: 8px;
    background-color: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 0.25rem;
}

.level-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.2s ease, background-color 0.2s ease;
}

.level-bar-fill.high { background-color: var(--danger-color); }
.level-bar-fill.medium { background-color: var(--warning-color); }

/* DDMRP Multi-Zone Level Bar */
.ddmrp-bar-container {
    position: relative;
    width: 100%;
    height: 16px;
    background-color: #111827;
    border-radius: 4px;
    overflow: hidden;
    display: flex;
    margin-top: 0.3rem;
    border: 1px solid #64748b;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.ddmrp-zone-red {
    background-color: #dc2626;
    height: 100%;
    border-right: 2px solid #fca5a5;
}

.ddmrp-zone-yellow {
    background-color: #d97706;
    height: 100%;
    border-right: 2px solid #fde68a;
}

.ddmrp-zone-green {
    background-color: #059669;
    height: 100%;
}

.ddmrp-marker {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: #ffffff;
    box-shadow: 0 0 6px #ffffff;
    transform: translateX(-50%);
    transition: left 0.15s ease;
    z-index: 5;
}

.ddmrp-badge {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    display: inline-block;
    letter-spacing: 0.3px;
    margin-top: 0.25rem;
    text-align: center;
}

.ddmrp-badge.active {
    background-color: rgba(16, 185, 129, 0.35);
    color: var(--success-color);
    border: 1px solid var(--success-color);
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.25);
}

.ddmrp-badge.stopped {
    background-color: rgba(239, 68, 68, 0.35);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.25);
}

.ddmrp-thresholds {
    display: flex;
    justify-content: space-between;
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

/* Connection Ports */
.port {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--bg-panel);
    border: 2px solid var(--border-color);
    position: absolute;
    cursor: crosshair;
    z-index: 10;
    transition: transform 0.15s ease, background-color 0.15s ease;
}

.port:hover {
    transform: scale(1.4);
    background-color: var(--primary-color);
    border-color: white;
}

.port.port-input {
    left: -7px;
    top: 50%;
    transform: translateY(-50%);
}

.port.port-output {
    right: -7px;
    top: 50%;
    transform: translateY(-50%);
}

.port.port-byproduct {
    right: -7px;
    transform: translateY(-50%);
    z-index: 10;
}

.port.port-byproduct-scrap {
    background-color: var(--warning-color);
    border-color: white;
    box-shadow: 0 0 5px var(--warning-color);
}

.port.port-byproduct-legit {
    background-color: var(--purple-color);
    border-color: white;
    box-shadow: 0 0 5px var(--purple-color);
}

/* Canvas Overlay Controls */
.canvas-overlay-controls {
    position: absolute;
    bottom: 20px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    z-index: 10;
}

.canvas-overlay-controls button {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background-color: var(--bg-panel);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.canvas-overlay-controls button:hover {
    background-color: var(--bg-panel-hover);
}

/* Minimap */
.minimap-container {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 160px;
    height: 100px;
    background-color: rgba(15, 23, 42, 0.85);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    z-index: 10;
    pointer-events: none;
}

#minimap-canvas {
    width: 100%;
    height: 100%;
}

/* Inspector & Analytics Sidebar */
.inspector-sidebar {
    width: 340px;
    border-left: 1px solid var(--border-color);
    border-right: none;
}

.tab-header {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.1);
}

.tab-btn {
    flex: 1;
    padding: 0.75rem 0.5rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.tab-btn i {
    width: 14px;
    height: 14px;
}

.tab-btn:hover {
    color: var(--text-secondary);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background-color: var(--bg-panel);
}

.tab-content {
    display: none;
    padding: 1rem;
    flex: 1;
    overflow-y: auto;
}

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

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--text-muted);
    gap: 0.75rem;
}

.empty-state i {
    width: 42px;
    height: 42px;
}

/* Inspector Forms */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    margin-bottom: 0.9rem;
}

.form-group label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

.form-group input, .form-group select {
    padding: 0.45rem 0.65rem;
    background-color: var(--bg-panel-hover);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.85rem;
    outline: none;
}

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

.section-title {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 1rem 0 0.5rem 0;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Byproduct Editor & Badges */
.bp-editor-card {
    background-color: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.55rem 0.65rem;
}

.bp-badge {
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.bp-badge.scrap {
    background-color: rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
    border: 1px solid rgba(245, 158, 11, 0.4);
}

.bp-badge.legit {
    background-color: rgba(139, 92, 246, 0.2);
    color: var(--purple-color);
    border: 1px solid rgba(139, 92, 246, 0.4);
}

/* Byproducts Grid */
.byproducts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
    margin-top: 0.75rem;
}

.byproduct-card {
    background-color: var(--bg-panel-hover);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.6rem;
    display: flex;
    flex-direction: column;
}

.byproduct-card .bp-title {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
}

.byproduct-card .bp-val {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--warning-color);
}

.chart-box {
    background-color: var(--bg-panel-hover);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
}

.chart-box h4 {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.chart-wrapper {
    position: relative;
    height: 160px;
}