:root {
  color-scheme: dark;
  --bg: #0f1419;
  --panel: #1a2332;
  --panel-border: #2d3a4f;
  --text: #e8eef7;
  --muted: #9aa8bc;
  --accent: #4f8cff;
  --ppg: #4f8cff;
  --diff1: #ff9f43;
  --diff2: #2ed573;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(circle at top, #1b2738 0%, var(--bg) 55%);
  color: var(--text);
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1.5rem;
  padding: 1.5rem 2rem 1rem;
  border-bottom: 1px solid var(--panel-border);
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 20, 25, 0.92);
  backdrop-filter: blur(8px);
}

.header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
  font-weight: 700;
}

.header p {
  margin: 0;
  color: var(--muted);
}

.header__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
}

.header__meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.jump-label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.jump-label select {
  min-width: 280px;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  color: var(--text);
}

.chart-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.25rem 2rem 2rem;
  max-width: 1600px;
  margin: 0 auto;
}

.metrics-panel {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--panel-border);
  background: #0f1722;
}

.metrics-panel__header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: 0.65rem;
}

.metrics-panel__title {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  font-weight: 700;
}

.metrics-panel__legend {
  font-size: 0.72rem;
  color: #6f8198;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 0.55rem;
}

.metric-card {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  background: #182233;
  border: 1px solid var(--panel-border);
  min-width: 0;
}

.metric-card__label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.metric-card__value {
  font-size: 0.95rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.metric-card__meta {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  margin-top: 0.15rem;
}

.metric-card__lit,
.metric-card__cohort {
  font-size: 0.65rem;
  line-height: 1.3;
}

.metric-card__lit {
  color: #7d8fa8;
}

.metric-card__cohort {
  color: #5fbf8a;
  font-weight: 600;
}

.record-row {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  scroll-margin-top: 6rem;
}

.record-row__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.25rem 0.75rem;
  border-bottom: 1px solid var(--panel-border);
}

.record-row__title {
  margin: 0;
  font-size: 1.05rem;
}

.record-row__subtitle {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.record-row__index {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.65rem;
  padding: 0.9rem 1.25rem;
  background: #121a26;
  border-bottom: 1px solid var(--panel-border);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.meta-item__label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.meta-item__value {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  word-break: break-word;
}

.apg-grid {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--panel-border);
  background: #101824;
}

.apg-grid--empty {
  color: var(--muted);
  font-size: 0.85rem;
}

.apg-grid__title {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-right: 0.25rem;
}

.apg-item {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  background: #182233;
  border: 1px solid var(--panel-border);
}

.apg-item__label {
  font-size: 0.82rem;
  font-weight: 700;
}

.apg-item--a .apg-item__label { color: #f1c40f; }
.apg-item--b .apg-item__label { color: #e74c3c; }
.apg-item--c .apg-item__label { color: #9b59b6; }
.apg-item--d .apg-item__label { color: #1abc9c; }

.apg-item__value {
  font-size: 0.92rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.btn {
  border: 1px solid var(--panel-border);
  background: var(--panel);
  color: var(--text);
  padding: 0.55rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
}

.btn:hover {
  border-color: var(--accent);
  background: #243147;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn--recalculate {
  border-color: #3d5f8f;
  background: #1c2d45;
}

.btn--recalculate:hover:not(:disabled) {
  border-color: var(--accent);
  background: #243147;
}

.chart-toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--panel-border);
  background: #171f2d;
}

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

.chart-toolbar__hint--right {
  margin-left: auto;
}

.chart-toolbar__value {
  min-width: 3.5rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}

.btn--small {
  padding: 0.35rem 0.7rem;
  font-size: 0.82rem;
}

.btn--ghost {
  background: transparent;
}

.chart-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.25rem 0.5rem 0.75rem;
  background: #141c28;
  border-bottom-left-radius: 14px;
  border-bottom-right-radius: 14px;
}

.chart-scroll::-webkit-scrollbar {
  height: 10px;
}

.chart-scroll::-webkit-scrollbar-track {
  background: #0f1419;
  border-radius: 999px;
}

.chart-scroll::-webkit-scrollbar-thumb {
  background: #3d4f68;
  border-radius: 999px;
}

.chart-scroll::-webkit-scrollbar-thumb:hover {
  background: #4f8cff;
}

.record-chart {
  min-height: 360px;
  flex: 0 0 auto;
}

.loading,
.error {
  text-align: center;
  padding: 3rem;
  color: var(--muted);
}

.error {
  color: #ff6b6b;
}

.footer {
  padding: 1rem 2rem 2rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

@media (max-width: 800px) {
  .header,
  .chart-list,
  .footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .header {
    flex-direction: column;
    align-items: stretch;
  }

  .header__actions {
    align-items: stretch;
  }

  .jump-label select {
    min-width: 0;
    width: 100%;
  }

  .meta-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}