/* ─── Historical Trends Section ───────────────────────────── */
.historical-section { margin-top: 40px; }
.historical-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
}
.historical-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  flex-wrap: wrap; gap: 12px; margin-bottom: 20px;
}

/* Segmented Control (iOS style) */
.segmented-control {
  display: inline-flex;
  background: #f1f5f9;
  border-radius: 8px;
  padding: 4px;
}
.segmented-control button {
  background: transparent;
  border: none;
  padding: 6px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s;
  font-family: 'Inter', sans-serif;
}
.segmented-control button.active {
  background: #fff;
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Controls Row */
.chart-controls-row {
  display: flex; gap: 16px; align-items: center; margin-bottom: 16px; flex-wrap: wrap;
}

/* Chip Selector */
.chip-selector {
  display: flex; gap: 8px; flex-wrap: wrap;
}
.chip {
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--muted);
  transition: all 0.2s;
}
.chip.active {
  background: #eff6ff;
  border-color: #bfdbfe;
  color: #1d4ed8;
}

/* Toggle Pair */
.toggle-pair {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
.toggle-pair button {
  background: #fff;
  border: none;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  border-right: 1px solid var(--border);
}
.toggle-pair button:last-child { border-right: none; }
.toggle-pair button.active {
  background: #f8fafc;
  color: var(--text);
}

.chart-container-inner {
  width: 100%;
  height: 400px;
  position: relative;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

#historical-error-state {
  display: none; text-align: center;
  padding: 32px; color: #ef4444;
  font-size: 15px; font-weight: 500;
}
#historical-loading {
  text-align: center; padding: 40px; color: var(--muted); font-size: 14px;
}

/* ─── Skeleton Loader ────────────────────────────────────────────────────── */
.historical-skeleton {
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.skeleton-header {
  height: 40px;
  width: 100%;
  max-width: 600px;
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 6px;
}
.skeleton-chart {
  height: 350px;
  width: 100%;
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ─── Responsive Styles ────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .segmented-control {
    display: flex;
    overflow-x: auto;
    width: 100%;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .segmented-control::-webkit-scrollbar {
    display: none;
  }
  .segmented-control button {
    flex: 0 0 auto;
    white-space: nowrap;
  }
  
  .chart-controls-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  
  .chart-controls-row #c1-toggle, 
  .chart-controls-row .toggle-pair {
    margin-left: 0 !important;
    width: 100%;
    display: flex;
  }
  
  .chart-controls-row .toggle-pair button {
    flex: 1;
    text-align: center;
  }
  
  #c3-pipeline-select {
    width: 100%;
  }
}