:root {
  --bg: #0b0d11;
  --bg2: #14171f;
  --bg3: #1a1e2a;
  --bg4: #222738;
  --border: #2a2f42;
  --accent: #5b8cff;
  --accent-dim: #3d5faa;
  --green: #00d68f;
  --green-bg: rgba(0, 214, 143, 0.12);
  --red: #ff5c5c;
  --red-bg: rgba(255, 92, 92, 0.12);
  --yellow: #ffca62;
  --text: #e0e2ed;
  --text-muted: #6b7089;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --radius: 10px;
  --radius-sm: 6px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

#app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  padding: 32px 0 24px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 28px;
  font-weight: 700;
}

.logo:hover { text-decoration: none; }
.logo-icon { font-size: 32px; }

.tagline {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 6px;
}

/* Footer */
.footer {
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

/* Compare input bar */
.compare-bar {
  display: flex;
  gap: 10px;
  align-items: center;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 32px;
}

.compare-bar input {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 14px;
}

.compare-bar input::placeholder { color: var(--text-muted); }

.compare-bar .vs-label {
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
}

.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}

.btn:hover { background: var(--accent-dim); }

.btn-secondary {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-secondary:hover { background: var(--bg4); }

/* Gallery grid */
.pairs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.pair-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
}

.pair-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.pair-label {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
}

.pair-repos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.pair-repo-name {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pair-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  padding: 3px 0;
}

.pair-stat-label { color: var(--text-muted); }

.pair-stat-value {
  font-family: var(--mono);
  font-weight: 600;
}

.winner { color: var(--green); }
.loser { color: var(--text-muted); }

/* Comparison view */
.compare-header {
  text-align: center;
  margin-bottom: 28px;
}

.compare-title {
  font-size: 22px;
  font-weight: 700;
}

.compare-title .vs { color: var(--text-muted); font-weight: 400; }

.compare-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 28px;
}

.compare-col {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.compare-col-header {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 4px;
}

.compare-col-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.metric-row:last-child { border-bottom: none; }

.metric-label {
  font-size: 13px;
  color: var(--text-muted);
}

.metric-value {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
}

.metric-value.leading { color: var(--green); }
.metric-value.trailing { color: var(--text-muted); }

.trend-up { color: var(--green); }
.trend-down { color: var(--red); }
.trend-flat { color: var(--text-muted); }

/* Metric comparison bars */
.metrics-table {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 28px;
}

.metrics-table-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-bar-row {
  margin-bottom: 14px;
}

.metric-bar-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.metric-bar-values {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 13px;
}

.metric-bar-track {
  flex: 1;
  height: 8px;
  background: var(--bg3);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
}

.metric-bar-fill-left {
  height: 100%;
  background: var(--accent);
  border-radius: 4px 0 0 4px;
  transition: width 0.3s;
}

.metric-bar-fill-right {
  height: 100%;
  background: var(--green);
  border-radius: 0 4px 4px 0;
  transition: width 0.3s;
}

.bar-val-left { color: var(--accent); min-width: 60px; text-align: right; }
.bar-val-right { color: var(--green); min-width: 60px; }

/* Charts */
.chart-section {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 28px;
}

.chart-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.chart-canvas {
  width: 100%;
  height: 220px;
  display: block;
}

.chart-legend {
  display: flex;
  gap: 20px;
  margin-top: 10px;
  font-size: 12px;
}

.chart-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.chart-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

/* Actions bar */
.actions-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

/* Loading / error states */
.loading {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.error-msg {
  text-align: center;
  padding: 40px 20px;
  color: var(--red);
  background: var(--red-bg);
  border-radius: var(--radius);
}

.note {
  font-size: 13px;
  color: var(--text-muted);
  padding: 12px 16px;
  background: var(--bg3);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

/* Responsive */
@media (max-width: 768px) {
  .pairs-grid { grid-template-columns: 1fr; }
  .compare-columns { grid-template-columns: 1fr; }
  .compare-bar { flex-direction: column; }
  .compare-bar input { width: 100%; }
}