:root {
  --bg: #0b1e33;
  --panel-bg: #10273f;
  --accent: #f4a940;
  --text: #eaf1f8;
  --muted: #9fb2c3;
  --primary-border: #f4a940;
  --upstream-border: #4f8ff7;
  --downstream-border: #4fce8a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
header {
  padding: 1.5rem 1rem 1rem;
  text-align: center;
}
header h1 { margin: 0 0 0.25rem; font-size: 1.6rem; }
.subtitle { margin: 0; color: var(--muted); }
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.panel {
  background: var(--panel-bg);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  border-left: 4px solid transparent;
}
.panel.primary { border-left-color: var(--primary-border); }
.panel.upstream { border-left-color: var(--upstream-border); }
.panel.downstream { border-left-color: var(--downstream-border); }
.panel h2, .panel h3 { margin-top: 0; }
.trend-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 640px) {
  .trend-row { grid-template-columns: 1fr; }
}
.reading { font-size: 1.1rem; line-height: 1.6; }
.reading .big { font-size: 1.8rem; font-weight: 600; color: var(--accent); }
.note { color: var(--muted); font-size: 0.85rem; margin: 0.5rem 0 0; }
.updated { text-align: center; color: var(--muted); font-size: 0.85rem; }
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.75rem;
  padding: 1rem;
}
footer a { color: var(--accent); }
.flood-tag {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.flood-none { background: #1d4d33; color: #a8f0c6; }
.flood-action { background: #6b5a1a; color: #ffe9a8; }
.flood-minor { background: #6b4a1a; color: #ffd8a8; }
.flood-moderate { background: #7a2f1a; color: #ffb8a0; }
.flood-major { background: #7a1a2f; color: #ffa0b8; }