:root {
    --bg: #0f1420;
    --panel: #161d2e;
    --panel-border: #232c42;
    --text: #e6e9f0;
    --text-dim: #8891a7;
    --accent: #4f8cff;
    --danger: #ff5470;
    --success: #35d399;
    --warning: #ffb454;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 24px;
    border-bottom: 1px solid var(--panel-border);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 18px;
}

.brand-author {
    font-weight: 400;
    font-size: 13px;
    color: var(--text-dim);
    margin-left: 4px;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-dim);
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-dim);
}

.dot.online {
    background: var(--success);
    box-shadow: 0 0 6px var(--success);
}

.dot.offline {
    background: var(--danger);
    box-shadow: 0 0 6px var(--danger);
}

.about {
    padding: 14px 24px;
    border-bottom: 1px solid var(--panel-border);
    background: rgba(79, 140, 255, 0.04);
}

.about p {
    margin: 0 0 8px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-dim);
    max-width: 1100px;
}

.about p:last-child {
    margin-bottom: 0;
}

.about strong {
    color: var(--text);
}

.about-stack {
    font-size: 12.5px;
}

.layout {
    display: grid;
    grid-template-columns: 240px 1fr 280px;
    gap: 16px;
    padding: 16px;
}

@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 10px;
    padding: 16px;
}

.panel h2 {
    margin: 0 0 12px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-dim);
}

.device-list,
.alerts-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.device-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    font-size: 13px;
}

.device-item .status {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 999px;
}

.device-item .status.online {
    background: rgba(53, 211, 153, 0.15);
    color: var(--success);
}

.device-item .status.offline {
    background: rgba(255, 84, 112, 0.15);
    color: var(--danger);
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
}

.chart-card {
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    padding: 12px;
}

.chart-card h3 {
    margin: 0 0 8px;
    font-size: 13px;
    color: var(--text-dim);
    font-weight: 500;
}

.alert-item {
    padding: 10px 12px;
    border-radius: 8px;
    background: rgba(255, 180, 84, 0.1);
    border-left: 3px solid var(--warning);
    font-size: 13px;
}

.alert-item .alert-title {
    font-weight: 600;
    margin-bottom: 4px;
}

.alert-item .alert-meta {
    color: var(--text-dim);
    font-size: 11px;
}

.empty-state {
    color: var(--text-dim);
    font-size: 13px;
    padding: 8px 0;
}