:root {
  --bg: #ffffff;
  --surface: #f6f7f9;
  --border: #e2e5ea;
  --text: #1a1d23;
  --text-muted: #5b6270;
  --accent: #2f6fed;
  --accent-track: #dde6fb;
  --line-actual: #1a1d23;
  --line-ndf: #c2782f;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1c1f26;
    --border: #2c303a;
    --text: #eceef2;
    --text-muted: #9aa1af;
    --accent: #6d97f7;
    --accent-track: #2a3550;
    --line-actual: #eceef2;
    --line-ndf: #e2a765;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  max-width: 960px;
  margin: 0 auto;
}

.site-header .brand {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.site-header nav a {
  margin-left: 1.25rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-header nav a:hover { color: var(--text); }

.site-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.hero h1 { font-size: 1.9rem; margin-bottom: 0.5rem; }
.hero .lede { color: var(--text-muted); max-width: 60ch; }

.cta-row { margin: 1.5rem 0; display: flex; gap: 0.75rem; flex-wrap: wrap; }

.button {
  display: inline-block;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  background: var(--surface);
  cursor: pointer;
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.card h2 { font-size: 1.05rem; margin-top: 0; }
.card p { color: var(--text-muted); font-size: 0.9rem; }

.predictions-header { margin-bottom: 1.5rem; }
.status-line { color: var(--text-muted); font-size: 0.9rem; margin: 0.5rem 0 1rem; }

.horizon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.horizon-card .horizon-name { margin: 0 0 0.25rem; font-size: 1.1rem; }
.horizon-card .target-time { color: var(--text-muted); font-size: 0.8rem; margin: 0 0 0.75rem; }

.point-value { margin: 0 0 1rem; }
.point-number { font-size: 1.8rem; font-weight: 700; }
.unit { color: var(--text-muted); font-size: 0.9rem; }

.interval-bar {
  position: relative;
  height: 8px;
  border-radius: 4px;
  background: var(--accent-track);
  margin-bottom: 0.4rem;
}

.interval-fill {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  border-radius: 4px;
  background: var(--accent);
  opacity: 0.35;
}

.interval-marker {
  position: absolute;
  top: -3px;
  width: 2px;
  height: 14px;
  background: var(--accent);
  border-radius: 1px;
}

.interval-labels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.25rem;
  margin: 0;
}

.interval-labels div:first-child { text-align: left; }
.interval-labels div:nth-child(2) { text-align: center; }
.interval-labels div:last-child { text-align: right; }

.interval-labels dt {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.interval-labels dd {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 600;
}

.ndf-panel {
  margin-top: 2.5rem;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.ndf-panel h2 { margin-top: 0; font-size: 1.1rem; }

.ndf-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem 1.5rem;
  margin: 1rem 0;
}

.ndf-stats dt { color: var(--text-muted); font-size: 0.8rem; }
.ndf-stats dd { margin: 0; font-size: 1.15rem; font-weight: 600; }

.fine-print { color: var(--text-muted); font-size: 0.8rem; }

.history-panel {
  margin-top: 2.5rem;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.history-panel h2 { margin-top: 0; font-size: 1.1rem; }
.history-panel p { color: var(--text-muted); font-size: 0.9rem; }

.history-legend {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.history-legend-item { display: inline-flex; align-items: center; gap: 0.4rem; }

.history-swatch {
  display: inline-block;
  width: 14px;
  height: 3px;
  border-radius: 2px;
}

.history-swatch-actual { background: var(--line-actual); }
.history-swatch-ndf { background: var(--line-ndf); }
.history-swatch-blended { background: var(--accent); }

.history-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.history-range-buttons { display: flex; gap: 0.4rem; }

.history-range-btn {
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
}

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

#history-reset-zoom { padding: 0.3rem 0.7rem; font-size: 0.8rem; }

.history-charts { position: relative; }
.history-chart { width: 100%; }
.history-diff-chart { width: 100%; }
.history-chart-svg { width: 100%; height: auto; display: block; touch-action: none; cursor: crosshair; }

.history-diff-label {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0.75rem 0 0.15rem;
}

.history-gridline { stroke: var(--border); stroke-width: 1; }
.history-zero-line { stroke: var(--text-muted); }
.history-axis-label { fill: var(--text-muted); font-size: 10px; }

.history-line { stroke-width: 2; }
.history-line-actual { stroke: var(--line-actual); }
.history-line-ndf { stroke: var(--line-ndf); }
.history-line-blended { stroke: var(--accent); }

.history-selection { fill: var(--accent); opacity: 0.15; stroke: var(--accent); stroke-width: 1; }
.history-crosshair { stroke: var(--text-muted); stroke-width: 1; stroke-dasharray: 3 3; pointer-events: none; }

.history-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
  font-size: 0.78rem;
  line-height: 1.4;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 5;
  white-space: nowrap;
}

.history-tooltip-date { font-weight: 600; margin-bottom: 0.2rem; }
.history-tooltip .history-swatch { margin-right: 0.35rem; }

.report .report-toc { margin-bottom: 1.5rem; }
.report .report-toc a { margin-right: 1rem; }

.markdown-body { max-width: 75ch; }
.markdown-body table { border-collapse: collapse; width: 100%; overflow-x: auto; display: block; }
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.6rem;
  font-size: 0.9rem;
}
.markdown-body code {
  background: var(--surface);
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
}