:root {
    --primary-color: #2563eb;
    --secondary-color: #4f46e5;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: var(--surface-color);
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.header-info {
    display: flex;
    gap: 30px;
    font-size: 14px;
    color: var(--text-secondary);
}

.controls {
    background: var(--surface-color);
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: center;
}

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

.control-group label {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--surface-color);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

select:hover {
    border-color: var(--primary-color);
}

select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-primary {
    padding: 8px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-primary:active {
    transform: translateY(0);
}

.channel-selector {
    background: var(--surface-color);
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.channel-selector h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.channel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.channel-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--bg-color);
}

.channel-item:hover {
    background: var(--surface-color);
    border-color: var(--primary-color);
}

.channel-item.active {
    background: #eff6ff;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.channel-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.channel-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
    flex: 1;
}

.channel-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    border: 2px solid var(--border-color);
}

.chart-container {
    background: var(--surface-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    height: 500px;
}

#vibration-chart {
    width: 100% !important;
    height: 100% !important;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--surface-color);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.stat-card h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.stat-unit {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 5px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.error {
    background: #fef2f2;
    color: var(--danger-color);
    padding: 15px;
    border-radius: 6px;
    border: 1px solid #fecaca;
    margin-bottom: 20px;
}

.btn-secondary {
    padding: 8px 16px;
    background: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: #4338ca;
}

.signal-processing-section {
    margin-top: 30px;
    padding: 20px;
    background: var(--surface-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.signal-processing-section h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.signal-processing-section h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.overlay-checkbox {
    margin-right: 5px;
    cursor: pointer;
}

.signal-processing-section label {
    cursor: pointer;
    user-select: none;
}

/* MQTT Publish Section */
.mqtt-publish-section {
    background: var(--surface-color);
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-top: 30px;
    margin-bottom: 20px;
}

.mqtt-publish-section h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.mqtt-publish-section .controls {
    margin-bottom: 15px;
    padding: 0;
    box-shadow: none;
}

.mqtt-topic-preview {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    background: var(--bg-color);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    margin-bottom: 15px;
}

.mqtt-topic-preview label {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-secondary);
}

.mqtt-topic-preview code {
    font-family: 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 14px;
    color: var(--primary-color);
    background: transparent;
    word-break: break-all;
}

.mqtt-status {
    padding: 10px 15px;
    border-radius: 6px;
    font-size: 14px;
    display: none;
}

.mqtt-status.success {
    display: block;
    background: #ecfdf5;
    color: var(--success-color);
    border: 1px solid #a7f3d0;
}

.mqtt-status.error {
    display: block;
    background: #fef2f2;
    color: var(--danger-color);
    border: 1px solid #fecaca;
}

#mqtt-sensor-select {
    min-width: 350px;
}

#mqtt-sensor-select optgroup {
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-color);
}

#mqtt-sensor-select option {
    padding: 5px 10px;
    font-weight: 400;
}

@media (max-width: 768px) {
    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .control-group {
        flex-direction: column;
        align-items: stretch;
    }

    .channel-grid {
        grid-template-columns: 1fr;
    }

    .chart-container {
        height: 400px;
        padding: 15px;
    }

    .stats-container {
        grid-template-columns: 1fr;
    }
}