body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    margin: 0;
    background: #f3f4f6;
    color: #111827;
}

header {
    background: #1f2937;
    color: #f9fafb;
    padding: 1rem 1.5rem;
}

header h1 {
    margin: 0;
    font-size: 1.6rem;
}

.container {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 1.5rem;
}

.column {
    flex: 1 1 320px;
    background: #ffffff;
    border-radius: 0.5rem;
    padding: 1rem 1.25rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.column h2, .column h3 {
    margin-top: 0;
}

.latest-values {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.latest-values span.label {
    font-weight: 600;
}

.links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.5rem;
}

.links a {
    font-size: 0.85rem;
    text-decoration: none;
    background: #e5e7eb;
    color: #111827;
    padding: 0.25rem 0.5rem;
    border-radius: 999px;
}

.links a:hover {
    background: #d1d5db;
}

footer {
    text-align: center;
    font-size: 0.8rem;
    color: #6b7280;
    padding: 1rem 0 1.5rem;
}

/* graph page */
.graph-container {
    max-width: 1100px;
    margin: 1.5rem auto;
    background: #ffffff;
    padding: 1rem 1.25rem 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.graph-links {
    margin-bottom: 0.75rem;
}

.graph-links a {
    margin-right: 0.4rem;
    font-size: 0.85rem;
    text-decoration: none;
    background: #e5e7eb;
    color: #111827;
    padding: 0.25rem 0.5rem;
    border-radius: 999px;
}

.graph-links a.active {
    background: #111827;
    color: #f9fafb;
}