:root {
  --bg: #f2f5f8;
  --card: #ffffff;
  --ink: #1d2b36;
  --ink-soft: #55707f;
  --accent: #0e7490;
  --accent-soft: #e0f2f7;
  --line: #d9e2ea;
  --ok: #15803d;
  --warn: #b45309;
  --err: #b91c1c;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(29, 43, 54, 0.08), 0 4px 16px rgba(29, 43, 54, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.45;
  overscroll-behavior-y: none; /* pull-to-refresh would fight chart panning */
}

/* Buttons: no double-tap-to-zoom delay / accidental zoom on taps */
button {
  touch-action: manipulation;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ---------- Header ---------- */

header {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  justify-content: space-between;
  align-items: flex-start;
}

.title-block h1 {
  margin: 0 0 4px;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
}

.reference {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.latest-block {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
}

.mode-switch {
  display: inline-flex;
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 3px;
}

.mode-btn {
  border: 0;
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-size: 0.88rem;
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
}

.mode-btn.active {
  background: var(--accent);
  color: #fff;
}

.latest-value-row {
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.latest-value {
  font-size: 2.6rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  white-space: nowrap;
}

.latest-value .unit {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--ink-soft);
  margin-left: 6px;
}

.latest-meta {
  font-size: 0.92rem;
  color: var(--ink-soft);
  text-align: right;
}

.status {
  margin-top: 2px;
  font-weight: 600;
}

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

/* ---------- Chart card ---------- */

.chart-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chart-toolbar {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

/* Resolution/aggregation label: states whether the chart shows raw
   values, bucket maxima, or daily averages */
.agg-info {
  margin-right: auto;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.range-buttons {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.toolbar-sep {
  width: 1px;
  height: 22px;
  background: var(--line);
  margin: 0 4px;
}

.range-btn {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.85rem;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.range-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.range-btn.selected {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.chart-wrap {
  position: relative;
  width: 100%;
  user-select: none;
}

.tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(29, 43, 54, 0.92);
  color: #fff;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.85rem;
  white-space: nowrap;
  transform: translate(-50%, 0);
  z-index: 10;
}

.tooltip .tt-date { color: #c8dbe6; }
.tooltip .tt-value { font-weight: 650; font-variant-numeric: tabular-nums; }

.navigator {
  height: 70px;
  margin-top: 6px;
}

/* Link to the integration guide, directly under the chart */
.integration-link {
  text-align: center;
  margin: 0;
  font-size: 0.95rem;
}

.integration-link a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.integration-link a:hover {
  border-bottom-color: var(--accent);
}

/* ---------- Integration guide page (einbindung.html) ---------- */

.back-link {
  align-self: center;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 0.9rem;
  white-space: nowrap;
}

.back-link:hover {
  border-color: var(--accent);
}

.doc-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 24px;
  font-size: 0.95rem;
}

.doc-card h2 {
  margin: 22px 0 6px;
  font-size: 1.15rem;
}

.doc-card h2:first-child {
  margin-top: 0;
}

.doc-card p {
  margin: 8px 0;
}

.doc-card ul {
  margin: 8px 0;
  padding-left: 22px;
}

.doc-card li {
  margin: 4px 0;
}

code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  background: var(--bg);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}

pre.code {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 8px 0 12px;
}

.doc-table {
  border-collapse: collapse;
  width: 100%;
  margin: 8px 0 12px;
  font-size: 0.92rem;
}

.doc-table th,
.doc-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.doc-table th {
  color: var(--ink-soft);
  font-weight: 600;
}

/* uPlot styling */

.uplot {
  font-family: inherit;
}

/* The plotting area owns all pointer gestures: zoom, pan, pinch.
   touch-action: none keeps the browser from scrolling/paging instead. */
.uplot .u-over {
  touch-action: none;
  cursor: crosshair;
  cursor: grab;
}

.uplot .u-over:active {
  cursor: grabbing;
}

.uplot .u-axis {
  stroke: var(--line);
}

.uplot .u-axis .u-text {
  fill: var(--ink-soft);
  font-size: 11px;
}

.uplot .u-grid .u-line {
  stroke: #e8eef3;
}

.uplot .u-cursor-x {
  stroke: var(--ink-soft);
}

/* Crosshair hidden while the pointer is outside the data field */
.uplot.cursor-off .u-cursor-x,
.uplot.cursor-off .u-cursor-y,
.uplot.cursor-off .u-cursor-pt {
  display: none;
}

/* ---------- Footer ---------- */

footer {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

footer p {
  margin: 4px 0;
}

footer a {
  color: var(--accent);
}

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
  header {
    flex-direction: column;
    align-items: stretch;
  }

  .latest-block {
    align-items: stretch;
  }

  .latest-value-row {
    justify-content: space-between;
    align-items: baseline;
  }

  .latest-value { font-size: 2.1rem; }

  .latest-meta { text-align: left; }

  .chart-toolbar { justify-content: center; }

  /* Aggregation label gets its own row above the centered buttons */
  .agg-info { width: 100%; margin-right: 0; text-align: center; }

  /* Comfortable touch targets (>= 40px) on phones */
  .range-btn,
  .mode-btn {
    min-height: 42px;
    padding: 8px 14px;
    font-size: 0.9rem;
  }

  .toolbar-sep { display: none; }

  .range-buttons { gap: 8px; }

  .chart-card {
    padding: 10px 8px 6px;
  }

  .doc-card {
    padding: 16px 14px;
  }

  .back-link {
    align-self: flex-start;
  }

  /* Notch / home-indicator insets */
  .page {
    padding-top: max(12px, env(safe-area-inset-top));
    padding-bottom: max(32px, env(safe-area-inset-bottom));
    padding-left: max(10px, env(safe-area-inset-left));
    padding-right: max(10px, env(safe-area-inset-right));
  }
}

@media (hover: none) {
  /* Tooltip is more readable slightly larger on touch devices */
  .tooltip { font-size: 0.95rem; padding: 10px 14px; }
}

/* ---------- Dark mode (follows system setting) ---------- */

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c121c;
    --card: #141c28;
    --ink: #dce6f0;
    --ink-soft: #8fa3b8;
    --accent: #38bdf8;
    --accent-soft: #123043;
    --line: #273348;
    --ok: #4ade80;
    --warn: #fbbf24;
    --err: #f87171;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.45), 0 4px 16px rgba(0, 0, 0, 0.35);
  }

  /* Bright accent needs dark text on filled controls */
  .mode-btn.active,
  .range-btn.selected {
    color: #0b1220;
  }

  .range-btn:hover {
    background: var(--accent-soft);
  }
}