:root {
    --bg-dark: #121212;
    --panel-bg: #1e1e1e;
    --accent-blue: #00d2ff;
    --border-color: #2a2e3d;
    --text-main: #ffffff;
    --text-muted: #888888;
    --danger-red: #ff4747;
    --success-green: #00ff66;
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
}

h2 {
    text-align: center;
    color: #f0f0f0;
    margin-top: 0;
}

/* Auth Header & Modal */
#authHeader {
    position: absolute;
    top: 20px;
    right: 20px;
    display: none;
}

.btn-logout {
    padding: 8px 15px;
    background: var(--danger-red);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--panel-bg);
    padding: 30px;
    border-radius: 8px;
    width: 320px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.auth-input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    box-sizing: border-box;
    background: #333;
    color: white;
    border: 1px solid #444;
    border-radius: 4px;
}

.otp-input {
    text-align: center;
    font-size: 1.2em;
    letter-spacing: 4px;
}

.btn-primary {
    width: 100%;
    padding: 10px;
    background: var(--accent-blue);
    color: #000;
    font-weight: bold;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.btn-secondary {
    padding: 8px 12px;
    background: #393535;
    color: #000000;
    border: 1px solid #92a1a4;
    border-radius: 4px;
    cursor: pointer;
}

/* Refresh Spin Animation */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.spinning {
    animation: spin 1s linear infinite;
}

/* Ensure clicks on the icon pass through to the button */
#btn-refresh img {
    pointer-events: none;
}

/* Low Voltage Banner */
#lvdWarning {
    display: none;
    background: var(--danger-red);
    color: white;
    padding: 15px;
    text-align: center;
    font-weight: bold;
    margin-bottom: 20px;
    border-radius: 8px;
    font-size: 1.2em;
}

/* Device Selector Bar */
.device-selector-container {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.select-dropdown {
    padding: 10px;
    background: #333;
    color: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1em;
}

/* Main Dashboard Responsive Grid */
.dashboard-container {
    display: grid;
    grid-template-columns: 320px 1fr; /* Left Sidebar on Desktop */
    gap: 20px;
    max-width: 1600px;
    margin: 0 auto;
}

/* Mobile Stacked View */
@media (max-width: 900px) {
    .dashboard-container {
        grid-template-columns: 1fr; /* Controls Stack Above Charts */
    }
}

/* Sidebar Panel */
.sidebar-panel {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    height: fit-content;
}

.sidebar-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.relay-card {
    background: #161922;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.channel-name { font-weight: bold; font-size: 0.9rem; }

.status-badge {
    font-size: 0.75rem;
    font-weight: bold;
    padding: 2px 8px;
    border-radius: 12px;
    text-transform: uppercase;
}
.status-on { background: rgba(0, 210, 255, 0.15); color: var(--accent-blue); border: 1px solid var(--accent-blue); }
.status-off { background: rgba(255, 71, 71, 0.15); color: var(--danger-red); border: 1px solid var(--danger-red); }

.card-body {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.mode-select {
    background: var(--bg-dark);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 0.8rem;
    outline: none;
    cursor: pointer;
}

/* Charts Main Area */
.charts-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.chart-card {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
}

.chart-title {
    font-size: 1rem;
    font-weight: bold;
    color: var(--accent-blue);
    margin-bottom: 10px;
}

/* Footer Telemetry Panel */
.footer-panel {
    background: var(--panel-bg);
    padding: 20px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    font-size: 0.9em;
    margin-top: 20px;
    flex-wrap: wrap;
    gap: 20px;
}