:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #3498db;
    --solar: #ff9f43;
    --grid: #95a5a6;
    --home: #2ecc71;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    margin-bottom: 30px;
}

header h1 {
    margin: 0;
    font-weight: 600;
}

#last-updated {
    color: var(--text-secondary);
    font-size: 0.9em;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.card h3 {
    margin-top: 0;
    font-size: 0.9em;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card .value {
    font-size: 1.8em;
    font-weight: bold;
}

.chart-container {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.chart-container h2 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.2em;
}

/* Tooltip Container */
.tooltip-icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-left: 8px;
    background-color: var(--text-secondary);
    color: var(--card-bg);
    border-radius: 50%;
    text-align: center;
    line-height: 16px;
    font-size: 12px;
    font-weight: bold;
    cursor: help;
    position: relative;
    vertical-align: middle;
    flex-shrink: 0;
    /* Prevent squishing */
}

/* Tooltip Text */
.tooltip-icon:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #333;
    color: #fff;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    opacity: 0;
    animation: fadeIn 0.3s forwards;
    pointer-events: none;
    text-transform: none;
    font-weight: normal;
    min-width: 150px;
    text-align: center;
}

/* Arrow */
.tooltip-icon:hover::before {
    content: '';
    position: absolute;
    bottom: 110%;
    /* Slightly overlapping text */
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #333 transparent transparent transparent;
    opacity: 0;
    animation: fadeIn 0.3s forwards;
}

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

/* Card Header Layout to accommodate icon */
.card h3 {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    /* Keep label left, icon next to it */
}