:root {
  --bg: #0f1720;
  --panel: #1b2733;
  --text: #e6edf3;
  --muted: #93a1ad;
  --accent: #4aa3ff;
  --border: #2a3947;
}

* { box-sizing: border-box; }

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

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}

header h1 { font-size: 20px; margin: 0; }
.actions { display: flex; align-items: center; gap: 12px; }
#status { color: var(--muted); font-size: 13px; }

button {
  background: var(--accent);
  color: #04121f;
  border: 0;
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: default; }

#sources {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 20px;
  padding: 16px 24px 0;
}
.source-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 240px;
}
.group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  user-select: none;
}
.group-header input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}
.source-group .source-card { min-width: 0; }
.source-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  min-width: 220px;
}
.source-card .label { font-weight: 600; }
.source-card .meta { color: var(--muted); margin-top: 4px; }
.source-card .err { color: #ff6b6b; margin-top: 4px; }
.source-card.hidden-src { opacity: 0.45; }

.src-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}
.src-toggle input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

#day-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 16px 24px 0;
}
#day-nav button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  min-width: 44px;
  padding: 8px 12px;
  font-size: 16px;
}
#day-nav button:disabled { opacity: 0.35; }
#day-label {
  font-weight: 600;
  min-width: 130px;
  text-align: center;
}

main {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 20px;
  padding: 20px 24px;
}
.chart-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px 18px;
}
.chart-panel h2 { font-size: 15px; margin: 4px 4px 10px; }
.chart-wrap { position: relative; height: 300px; }

footer {
  padding: 16px 24px 32px;
  color: var(--muted);
  font-size: 12px;
}

/* Touch-Geraete: Scrubben auf den Graphen soll die Seite nicht mitscrollen. */
.chart-wrap { touch-action: none; }

/* Mobile / schmale Displays */
@media (max-width: 640px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 12px 16px;
  }
  header h1 { font-size: 18px; }
  .actions { width: 100%; justify-content: space-between; }
  #status { font-size: 12px; }
  button { padding: 10px 14px; } /* groessere Tap-Flaeche */

  #sources { padding: 12px 16px 0; gap: 14px; }
  .source-group { width: 100%; min-width: 0; }
  .source-card { min-width: 0; width: 100%; }

  main {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 14px 16px;
  }
  .chart-panel { padding: 10px 10px 14px; }
  .chart-wrap { height: 260px; }

  footer { padding: 14px 16px 28px; }
}