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

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: #f0f2f0;
  color: #1a1a1a;
  min-height: 100vh;
}

/* ── Header ──────────────────────────────────────────────── */
header {
  background: #1b4332;
  color: #fff;
  padding: 0 2rem;
  box-shadow: 0 2px 6px rgba(0,0,0,.25);
  position: relative;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  height: 64px;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .02em;
  white-space: nowrap;
}

/* ── Main layout ─────────────────────────────────────────── */
main {
  max-width: 1280px;
  margin: 2rem auto;
  padding: 0 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* ── Section header ──────────────────────────────────────── */
.section-header {
  margin-bottom: 1.25rem;
}

.section-header h2 {
  font-size: 1.05rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: #1b4332;
}

.section-header .subtitle {
  font-size: .85rem;
  color: #666;
  margin-top: .25rem;
}

/* ── Comparison grid ─────────────────────────────────────── */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

/* ── Chart cards ─────────────────────────────────────────── */
.comp-card {
  background: #fff;
  border-radius: 10px;
  padding: 1.25rem 1.5rem 1rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
}

.comp-card h3 {
  font-size: .82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: #2d6a4f;
  margin-bottom: 1rem;
}

.chart-wrap {
  position: relative;
  height: 300px;
}

/* ── Month labels below each chart ───────────────────────── */
.comp-months {
  display: flex;
  gap: 1.5rem;
  margin-top: .75rem;
  padding-top: .6rem;
  border-top: 1px solid #eee;
}

.comp-month-item {
  display: flex;
  align-items: center;
  gap: .45rem;
  font-size: .78rem;
  color: #555;
}

.comp-month-swatch {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.comp-month-label {
  font-weight: 600;
  color: #333;
}

/* ── Legend ──────────────────────────────────────────────── */
.comp-legend {
  display: flex;
  gap: 1.5rem;
  margin-bottom: .75rem;
  justify-content: center;
}

.comp-legend-item {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .8rem;
  color: #444;
}

.comp-legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── Error / loading ─────────────────────────────────────── */
.error-msg {
  color: #c0392b;
  padding: 2rem;
  text-align: center;
  font-size: .95rem;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .header-inner {
    height: auto;
    padding: .75rem 0;
    flex-wrap: wrap;
  }

  main {
    padding: 0 1rem 3rem;
  }
}