:root {
  --bg: #0f0f13;
  --surface: #1a1a24;
  --border: #2a2a3a;
  --text: #e8e8ed;
  --text-muted: #8888a0;
  --accent: #e10600;
  --accent-hover: #ff1a14;

  --compound-soft: #ffd700;
  --compound-medium: #ffaa00;
  --compound-hard: #ffffff;
  --compound-inter: #00cc44;
  --compound-wet: #0088ff;
}

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

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

header {
  border-bottom: 2px solid var(--accent);
  padding: 1rem 0;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.back-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
}
.back-link:hover { color: var(--text); }

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
}

.card h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.hidden { display: none; }

/* Picker */
.picker-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

select, button {
  font-family: inherit;
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

button {
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}
button:hover { background: var(--accent-hover); }

/* Driver chips */
#driver-chips {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.driver-chip {
  padding: 0.375rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  opacity: 0.5;
  transition: opacity 0.15s, border-color 0.15s;
}

.driver-chip.selected {
  opacity: 1;
  border-color: currentColor;
}

/* Charts */
.js-plotly-plot .plotly .modebar { opacity: 0.5; }

@media (max-width: 640px) {
  .picker-row { flex-direction: column; }
  .picker-row select, .picker-row button { width: 100%; }
}