/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.45;
  color: #1f2328;
  background: #f6f8fa;
}

body {
  margin: 0;
  padding: 0 1rem 4rem;
  max-width: 1200px;
  margin: 0 auto;
}

a { color: #0969da; }
a:hover { text-decoration: underline; }

/* ---------- header ---------- */
.site-header { padding: 2rem 0 1.5rem; }
.site-header h1 { margin: 0 0 .25rem; font-size: 1.6rem; }
.site-header .tagline { margin: 0; color: #59636e; }

/* ---------- callout ---------- */
.callout {
  background: #fff8c5;
  border: 1px solid #d4a72c;
  border-radius: 6px;
  padding: .75rem 1rem;
  margin-bottom: 1rem;
}
.callout strong { color: #59450a; }
.callout a { color: inherit; }
.nightly-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.nightly-summary h2 { margin: 0 0 .25rem; font-size: 1rem; }
.nightly-summary p { margin: 0; color: #59636e; }
.status-clean { color: #1a7f37; font-weight: 600; }
.status-inconclusive { color: #9a6700; font-weight: 600; }
.status-regression { color: #cf222e; font-weight: 600; }

/* ---------- error / empty ---------- */
.error-panel {
  background: #ffebe9;
  border: 1px solid #ff8182;
  border-radius: 6px;
  padding: .75rem 1rem;
  margin-bottom: 1rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .85rem;
  white-space: pre-wrap;
  word-break: break-word;
}
.empty-state {
  background: #fff;
  border: 1px dashed #d0d7de;
  border-radius: 6px;
  padding: 1.5rem;
  text-align: center;
}
.empty-state h2 { margin: 0 0 .5rem; font-size: 1.1rem; }

/* ---------- grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

/* ---------- card ---------- */
.card {
  display: block;
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 8px;
  padding: 1rem;
  color: inherit;
  text-decoration: none;
  transition: border-color 120ms, transform 120ms, box-shadow 120ms;
}
.card:hover {
  border-color: #1f6feb;
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(31, 111, 235, .15);
  text-decoration: none;
}
.card.regression { border-color: #cf222e; box-shadow: inset 0 0 0 1px #cf222e; }
.card.error-row { background: #fff8f0; }

.card h2 {
  margin: 0 0 .5rem;
  font-size: 1rem;
  word-break: break-word;
}

.card .score-line {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  margin-bottom: .25rem;
}
.card .score {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.card .score.error { color: #cf222e; font-size: 1rem; font-weight: 500; }
.card .submetrics {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem .75rem;
  color: #59636e;
  font-size: .78rem;
}

.card .delta-up   { color: #1a7f37; }
.card .delta-down { color: #cf222e; }
.card .delta-flat { color: #59636e; }

.card .sparkline {
  width: 100%;
  height: 36px;
  display: block;
  margin: .5rem 0;
}
.card .sparkline .line   { fill: none; stroke: #1f6feb; stroke-width: 1.5; }
.card .sparkline .last   { fill: #1f6feb; }
.card .sparkline .axis   { stroke: #d0d7de; stroke-width: 1; stroke-dasharray: 2 2; }
.card .sparkline .error  { fill: #cf222e; }
.card.regression .sparkline .line { stroke: #cf222e; }

.card .meta {
  font-size: .8rem;
  color: #59636e;
  display: flex;
  justify-content: space-between;
}
.card .meta code { background: #eaeef2; padding: 1px 4px; border-radius: 3px; }
/* ---------- skill detail page ---------- */
.chart-section, .detail-section, .history-section { margin-top: 2rem; }
.chart-wrapper {
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  padding: 1rem;
  position: relative;
  height: 360px;
}
.chart-wrapper canvas { width: 100% !important; height: 100% !important; }

.detail { background: #fff; border: 1px solid #d0d7de; border-radius: 6px; padding: 1rem; }
.detail h3 { margin-top: 0; }
.detail table {
  border-collapse: collapse;
  width: 100%;
  font-size: .9rem;
}
.detail th, .detail td {
  border-bottom: 1px solid #eaeef2;
  padding: .35rem .5rem;
  text-align: left;
  vertical-align: top;
}
.detail tr.case-error td { background: #ffebe9; }
.detail .metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: .25rem .75rem;
  font-size: .85rem;
}
.detail .metrics-grid dt { font-weight: 600; color: #59636e; }
.detail .metrics-grid dd { margin: 0 0 .25rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.history-table { width: 100%; border-collapse: collapse; font-size: .85rem; margin-top: .5rem; }
.history-table th, .history-table td {
  border-bottom: 1px solid #eaeef2;
  padding: .35rem .5rem;
  text-align: left;
}
.history-table tr.error td { background: #ffebe9; }
pre {
  overflow-x: auto;
  background: #eaeef2;
  border-radius: 6px;
  padding: .75rem;
}

/* ---------- footer ---------- */
.site-footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #d0d7de;
  color: #59636e;
  font-size: .85rem;
}

@media (prefers-color-scheme: dark) {
  html { color: #e6edf3; background: #0d1117; }
  a { color: #79c0ff; }
  .card, .chart-wrapper, .detail, .empty-state, .nightly-summary { background: #161b22; border-color: #30363d; }
  .card.regression { box-shadow: inset 0 0 0 1px #f85149; border-color: #f85149; }
  .card .meta, .site-footer { color: #8b949e; }
  .card .meta code { background: #21262d; }
  .callout { background: #341a00; border-color: #d29922; color: #f0c674; }
  .error-panel { background: #420d10; border-color: #f85149; color: #ffabba; }
  .empty-state { border-color: #30363d; }
  .card .sparkline .axis { stroke: #30363d; }
  .history-table tr.error td, .detail tr.case-error td { background: #420d10; }
  .pattern-tag { background: #0d3a5a; color: #79c0ff; }
}