/* =========================
   Overview Layout
   ========================= */
.layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: calc(100vh - 60px);
}

/* =========================
   Sidebar
   ========================= */
.sidebar {
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 1.5rem;
}

.sidebar h2 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.sidebar ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.station {
    padding: 0.6rem 0.75rem;
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: background 0.3s, color 0.3s;
}

.station.active,
.station:hover {
    background: var(--primary-soft);
    color: var(--primary);
}

/* =========================
   Main Content
   ========================= */
.main {
    padding: 1.5rem;
}

/* =========================
   Stats Cards Grid
   ========================= */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 1rem;
}

.card {
    background: var(--surface);
    border-radius: 10px;
    border: 1px solid var(--border);
    padding: 1rem;
    transition: transform 0.2s ease;
}

.card:hover {
    transform: translateY(-3px);
}

.card h3 {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.card .value {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-main);
}

.card .status {
    font-size: 0.85rem;
}

/* State colors */
.card.ok {
    border-color: var(--ok-soft);
    background: var(--ok-soft);
}

.card.ok .status {
    color: var(--ok);
}

.card.warn {
    border-color: var(--warn-soft);
    background: var(--warn-soft);
}

.card.warn .status {
    color: var(--warn);
}

/* =========================
   Chart Section
   ========================= */
.chart-card {
    margin-top: 1.5rem;
    background: var(--surface);
    border-radius: 10px;
    border: 1px solid var(--border);
    padding: 1rem;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.chart-header h3 {
    font-size: 1rem;
    color: var(--text-main);
}

.chart-header select {
    font-size: 0.85rem;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-main);
}

.chart-placeholder {
    height: 220px;
    border-radius: 8px;
    border: 1px dashed var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* =========================
   Responsive
   ========================= */
@media (max-width: 800px) {
    .layout {
        grid-template-columns: 1fr;
    }
    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
}

.welcome {
    margin-bottom: 1.5rem;
    text-align: center;
}
.welcome h2 {
    color: var(--primary);
}