body { font-family: system-ui, sans-serif; margin: 0; color: #1b1b1f; }
header, nav { padding: 12px 20px; border-bottom: 1px solid #e5e5e5; }
main { padding: 20px; }
.cards { display: flex; flex-wrap: wrap; gap: 12px; }
.card { border: 1px solid #ddd; border-radius: 8px; padding: 12px 16px; min-width: 160px; }
.card.up { background: #e9f7ef; border-color: #36a96a; }
table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid #eee; }
.err { color: #b00020; }
nav button.active { font-weight: 700; }