:root {
    /* Color Palette */
    --primary-dark: #1a237e;
    --primary-main: #283593;
    --primary-light: #3949ab;
    --secondary-dark: #00695c;
    --secondary-main: #00796b;
    --secondary-light: #00897b;
    --accent-red: #d32f2f;
    --accent-orange: #f57c00;
    --accent-amber: #ffa000;
    --accent-green: #388e3c;
    --accent-blue: #1976d2;
    --accent-purple: #7b1fa2;
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #eeeeee;
    --neutral-300: #e0e0e0;
    --neutral-400: #bdbdbd;
    --neutral-500: #9e9e9e;
    --neutral-600: #757575;
    --neutral-700: #616161;
    --neutral-800: #424242;
    --neutral-900: #212121;
    
    /* Component Colors */
    --motor-color: var(--accent-blue);
    --actuator-color: var(--accent-purple);
    --sensor-color: var(--accent-green);
    --inverter-color: var(--accent-orange);
    --softstarter-color: var(--accent-amber);
    --breaker-color: var(--accent-red);
    --contactor-color: var(--secondary-main);
    --relay-color: var(--primary-main);
    --plc-color: var(--neutral-800);
    --hmi-color: var(--neutral-700);
    
    /* Sizes */
    --grid-size: 20px;
    --block-size: 80px;
    --component-gap: 5px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, var(--neutral-100) 0%, var(--neutral-200) 100%);
    color: var(--neutral-900);
    line-height: 1.6;
    overflow-x: hidden;
}

#plc-app {
    min-height: 100vh;
}

/* Header Styles */
.app-header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-main));
    color: white;
    padding: 1.5rem 2rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    position: relative;
    overflow: hidden;
}

.app-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" opacity="0.1"><circle cx="20" cy="20" r="2" fill="white"/><circle cx="50" cy="30" r="1.5" fill="white"/><circle cx="80" cy="40" r="1" fill="white"/><circle cx="30" cy="70" r="1.5" fill="white"/><circle cx="70" cy="80" r="2" fill="white"/></svg>');
}

.header-content {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
}

.app-title {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.app-subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Main Layout */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
    align-items: start;
}

/* Configuration Panel */
.config-panel {
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    overflow: hidden;
}

.config-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--neutral-200);
}

.config-section:last-child {
    border-bottom: none;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-main);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--neutral-200);
}

.section-icon {
    font-size: 1.5rem;
}

/* Component Items */
.component-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: var(--neutral-50);
    border-radius: 8px;
    margin-bottom: 0.75rem;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.component-item:hover {
    background: white;
    border-color: var(--neutral-300);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.component-info {
    flex: 1;
}

.component-name {
    font-weight: 600;
    color: var(--neutral-800);
    margin-bottom: 0.25rem;
}

.component-specs {
    font-size: 0.85rem;
    color: var(--neutral-600);
}

.component-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quantity-control {
    display: flex;
    align-items: center;
    background: white;
    border: 1px solid var(--neutral-300);
    border-radius: 6px;
    overflow: hidden;
}

.quantity-btn {
    background: var(--neutral-100);
    border: none;
    width: 32px;
    height: 32px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.quantity-btn:hover {
    background: var(--neutral-200);
}

.quantity-btn:active {
    background: var(--neutral-300);
}

.quantity-display {
    width: 40px;
    height: 32px;
    border: none;
    text-align: center;
    background: white;
    font-weight: 600;
}

/* Visualization Area */
.visualization-area {
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 800px;
}

/* Tabs */
.visualization-tabs {
    display: flex;
    background: var(--neutral-100);
    border-bottom: 1px solid var(--neutral-300);
}

.visualization-tab {
    padding: 1rem 1.5rem;
    cursor: pointer;
    border: none;
    background: none;
    font-weight: 500;
    color: var(--neutral-600);
    transition: all 0.3s ease;
    position: relative;
}

.visualization-tab:hover {
    color: var(--primary-main);
    background: var(--neutral-200);
}

.visualization-tab.active {
    color: var(--primary-main);
    background: white;
}

.visualization-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-main);
}

.tab-content {
    flex: 1;
    display: none;
    padding: 1.5rem;
    overflow: auto;
}

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

/* Canvases */
.design-canvas {
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(var(--neutral-200) 1px, transparent 1px),
        linear-gradient(90deg, var(--neutral-200) 1px, transparent 1px);
    background-size: var(--grid-size) var(--grid-size);
    background-color: var(--neutral-100);
    border: 1px solid var(--neutral-300);
    border-radius: 8px;
    position: relative;
    overflow: auto;
}

.canvas-container {
    position: relative;
    width: 100%;
    height: 100%;
    min-width: 1200px;
    min-height: 600px;
}

/* Component Blocks */
.component-block {
    position: absolute;
    border: 2px solid;
    border-radius: 6px;
    background: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0.5rem;
    cursor: move;
    transition: all 0.3s ease;
    z-index: 10;
}

.component-block:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
    z-index: 100;
}

.component-block.motor {
    border-color: var(--motor-color);
    background: linear-gradient(135deg, rgba(25, 118, 210, 0.1) 0%, rgba(25, 118, 210, 0.05) 100%);
}

.component-block.actuator {
    border-color: var(--actuator-color);
    background: linear-gradient(135deg, rgba(123, 31, 162, 0.1) 0%, rgba(123, 31, 162, 0.05) 100%);
}

.component-block.sensor {
    border-color: var(--sensor-color);
    background: linear-gradient(135deg, rgba(56, 142, 60, 0.1) 0%, rgba(56, 142, 60, 0.05) 100%);
}

.component-block.inverter {
    border-color: var(--inverter-color);
    background: linear-gradient(135deg, rgba(245, 124, 0, 0.1) 0%, rgba(245, 124, 0, 0.05) 100%);
}

.component-block.softstarter {
    border-color: var(--softstarter-color);
    background: linear-gradient(135deg, rgba(255, 160, 0, 0.1) 0%, rgba(255, 160, 0, 0.05) 100%);
}

.component-block.breaker {
    border-color: var(--breaker-color);
    background: linear-gradient(135deg, rgba(211, 47, 47, 0.1) 0%, rgba(211, 47, 47, 0.05) 100%);
}

.component-block.contactor {
    border-color: var(--contactor-color);
    background: linear-gradient(135deg, rgba(0, 121, 107, 0.1) 0%, rgba(0, 121, 107, 0.05) 100%);
}

.component-block.relay {
    border-color: var(--relay-color);
    background: linear-gradient(135deg, rgba(40, 53, 147, 0.1) 0%, rgba(40, 53, 147, 0.05) 100%);
}

.component-block.plc {
    border-color: var(--plc-color);
    background: linear-gradient(135deg, rgba(66, 66, 66, 0.1) 0%, rgba(66, 66, 66, 0.05) 100%);
}

.block-icon {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.block-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-align: center;
    line-height: 1.2;
}

.block-spec {
    font-size: 0.7rem;
    color: var(--neutral-600);
    text-align: center;
    margin-top: 0.25rem;
}

/* Connection Lines */
.connection-line {
    position: absolute;
    background: var(--neutral-500);
    transform-origin: 0 0;
    pointer-events: none;
    z-index: 1;
}

.connection-line.power {
    background: var(--accent-red);
    height: 3px;
}

.connection-line.control {
    background: var(--accent-blue);
    height: 2px;
    border-style: dashed;
}

.connection-line.signal {
    background: var(--accent-green);
    height: 2px;
}

/* BOM Table */
.bom-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.bom-table th {
    background: linear-gradient(135deg, var(--primary-main), var(--primary-dark));
    color: white;
    padding: 1rem;
    text-align: right;
    font-weight: 600;
    font-size: 0.9rem;
}

.bom-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--neutral-200);
    font-size: 0.85rem;
}

.bom-table tr:hover {
    background: var(--neutral-50);
}

.category-header {
    background: linear-gradient(135deg, var(--secondary-main), var(--secondary-dark));
    color: white;
    font-weight: bold;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    justify-content: center;
}

.action-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.action-btn.primary {
    background: linear-gradient(135deg, var(--primary-main), var(--primary-dark));
    color: white;
}

.action-btn.success {
    background: linear-gradient(135deg, var(--accent-green), #2e7d32);
    color: white;
}

.action-btn.warning {
    background: linear-gradient(135deg, var(--accent-amber), #f57f17);
    color: white;
}

.action-btn.danger {
    background: linear-gradient(135deg, var(--accent-red), #c62828);
    color: white;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-container {
        grid-template-columns: 1fr;
    }
    
    .config-panel {
        order: 2;
    }
    
    .visualization-area {
        order: 1;
    }
}

@media (max-width: 768px) {
    .main-container {
        padding: 1rem;
    }
    
    .app-title {
        font-size: 2rem;
    }
    
    .visualization-tabs {
        flex-wrap: wrap;
    }
    
    .action-buttons {
        flex-direction: column;
    }
}