:root {
    --bg-color: #f4f4f9;
    --card-bg: #ffffff;
    --text-color: #333;
    --accent-color: #2c974b;
    --border-color: #ddd;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

select {
    padding: 8px 12px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    min-width: 200px;
}

.time-range {
    display: flex;
    gap: 10px;
}

.range-btn {
    padding: 8px 16px;
    border: 1px solid var(--accent-color);
    background: transparent;
    color: var(--accent-color);
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.range-btn.active,
.range-btn:hover {
    background: var(--accent-color);
    color: white;
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 20px;
}

.chart-wrapper {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h3 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.1em;
    color: #666;
}

canvas {
    width: 100% !important;
    height: 300px !important;
}

/* Multi-Device Layout */
.device-section {
    margin-bottom: 40px;
}

.device-header {
    background: #e9ecef;
    padding: 10px 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    border-left: 5px solid #2c3e50;
}

.charts-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.chart-wrapper {
    flex: 1;
    min-width: 400px;
    /* Ensure 2 columns on wide screens */
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.canvas-container {
    position: relative;
    height: 300px;
    width: 100%;
}

.device-divider {
    border: 0;
    height: 1px;
    background: #ddd;
    margin: 40px 0;
}

/* Range Buttons Active State */
.range-btn.active {
    background-color: #2c3e50;
    color: white;
}

/* Grouped Controller Layout */
.controller-section {
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 40px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.controller-header {
    border-bottom: 2px solid #f0f0f0;
    margin-bottom: 20px;
    padding-bottom: 10px;
}

.controller-header h2 {
    margin: 0;
    color: #2c3e50;
}

/* Environment Chart (Full Width) */
.environment-row {
    margin-bottom: 30px;
}

.chart-wrapper.wide {
    width: 100%;
    min-width: unset;
    box-shadow: none;
    /* Inside controller card */
    padding: 0;
}

/* Ports Grid */
.ports-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 20px;
}

.port-card {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 6px;
    padding: 15px;
}

.port-card h4 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.1em;
    color: #495057;
}

.canvas-container.small {
    height: 200px;
}

/* Override chart height for small containers */
.port-card canvas {
    height: 200px !important;
}