:root {
    --primary-color: #2c3e50;
    --secondary-color: #ecf0f1;
    --accent-color: #3498db;
    --text-color: #333;
    --background-color: #f9f9f9;
    --chart-border-color: #ddd;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.chart-container {
    position: relative;
    height: 60vh;
    min-height: 400px;
    margin-bottom: 30px;
    border: 1px solid var(--chart-border-color);
    border-radius: 8px;
    padding: 15px;
    background-color: white;
}

h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
}

.info-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background-color: var(--secondary-color);
    border-radius: 8px;
    margin-bottom: 20px;
}

.current-time {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 1.1em;
}

.data-info {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.sensor-info {
    background-color: white;
    padding: 12px;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    min-width: 200px;
    margin-bottom: 10px;
}

.sensor-name {
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--primary-color);
}

.sensor-value {
    font-size: 1.2em;
    color: var(--accent-color);
}

.theme-toggle {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.theme-toggle:hover {
    background-color: #1a252f;
}

.dark-theme {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --accent-color: #f39c12;
    --text-color: #ecf0f1;
    --background-color: #1a1a1a;
    --chart-border-color: #555;
}

.error-message {
    color: #e74c3c;
    padding: 10px;
    background-color: #fadbd8;
    border-radius: 5px;
    margin-top: 10px;
    display: none;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: #7f8c8d;
    font-size: 0.9em;
}

/* Responsive styles */
@media (max-width: 768px) {
    .chart-container {
        height: 50vh;
    }

    .info-panel {
        flex-direction: column;
        gap: 15px;
    }

    .data-info {
        justify-content: center;
    }
}

/* Control panel */
.control-panel {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #1a252f;
}

select {
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #ddd;
}