:root {
  --bg: #f5f6f8;
  --card-bg: #ffffff;
  --border: #d8dde3;
  --text: #1f2933;
  --muted: #6b7785;
  --accent: #2563eb;
  --tab-bg: #eef1f5;
  --tab-active-bg: #ffffff;
  --gap: 14px;
  color-scheme: light;
  font-synthesis: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --card-bg: #161b22;
    --border: #2a323d;
    --text: #d1d5db;
    --muted: #9ca3af;
    --accent: #60a5fa;
    --tab-bg: #1b212b;
    --tab-active-bg: #1f2630;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

h1, h2 { margin: 0; font-weight: 600; }
h1 { font-size: 1.15rem; }
h2 { font-size: 1rem; }

.muted { color: var(--muted); }
.small { font-size: 0.8rem; }

/* ---- header ---- */
.topbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 10px 18px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}

.fed-tabs {
  display: flex;
  gap: 4px;
  margin-top: 6px;
}
.fed-tab {
  font: inherit;
  font-size: 0.9rem;
  padding: 4px 14px;
  border: 1px solid transparent;
  border-radius: 6px 6px 0 0;
  background: var(--tab-bg);
  color: var(--muted);
  cursor: pointer;
}
.fed-tab.active {
  background: var(--tab-active-bg);
  color: var(--text);
  border-color: var(--border);
  border-bottom-color: var(--card-bg);
  position: relative;
  z-index: 2;
}
.fed-tab:disabled { opacity: 0.5; cursor: not-allowed; }

.sub-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  background: var(--card-bg);
  padding: 0 18px;
}
.sub-tab {
  font: inherit;
  font-size: 0.9rem;
  padding: 8px 16px;
  background: transparent;
  color: var(--muted);
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
}
.sub-tab.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* ---- datebar ---- */
.datebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 5;
}

.datebar button {
  font: inherit;
  padding: 4px 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  border-radius: 4px;
  cursor: pointer;
}
.datebar button:hover:not(:disabled) { background: var(--tab-bg); }
.datebar button:disabled { opacity: 0.4; cursor: not-allowed; }

.datebar input[type="date"] {
  font: inherit;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--card-bg);
  color: var(--text);
  min-width: 11rem;
}
.datebar input[type="date"]::-webkit-calendar-picker-indicator {
  filter: var(--cal-icon-filter, none);
}
@media (prefers-color-scheme: dark) {
  .datebar input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(0.8);
  }
}

#day-status { margin-left: auto; }

/* ---- views ---- */
.view { display: none; }
.view.active { display: block; }

.overview-controls {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}
.agg-label { font-size: 0.85rem; color: var(--muted); }
.agg-buttons {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.agg-btn {
  font: inherit;
  font-size: 0.85rem;
  padding: 3px 12px;
  border: none;
  border-right: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--muted);
  cursor: pointer;
}
.agg-btn:last-child { border-right: none; }
.agg-btn.active {
  background: var(--accent);
  color: #fff;
}
.agg-btn:hover:not(.active) { background: var(--tab-bg); }

#overview-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
  padding: var(--gap);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px 12px;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.card-wide { grid-column: 1 / -1; }

.card h2 {
  margin-bottom: 6px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.chart {
  width: 100%;
  height: 260px;
}

#details-view { padding: var(--gap); }

#day-detail-body { width: 100%; }

#day-detail-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-bottom: 10px;
}
#day-detail-body td, #day-detail-body th {
  border: 1px solid var(--border);
  padding: 3px 8px;
  text-align: left;
}
#day-detail-body td.num { text-align: right; font-variant-numeric: tabular-nums; }
#day-detail-body .detail-section { margin-bottom: 14px; }
#day-detail-body .detail-section h3 { margin: 0 0 4px; font-size: 0.85rem; }
#day-detail-body .fp-chart { height: 220px; }

footer { padding: 18px; text-align: center; }

@media (max-width: 880px) {
  #overview-grid { grid-template-columns: 1fr; }
  .chart { height: 220px; }
}