:root {
  --bg: #f8f9fa;
  --text: #1a1a1a;
  --muted: #555;
  --accent: #1f4e79;
  --card: #ffffff;
  --border: #e1e4e8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  background: var(--accent);
  color: white;
  padding: 3rem 1rem 2rem;
  text-align: center;
}

header h1 { margin: 0 0 0.5rem; font-size: 2rem; }
header .subtitle { margin: 0; opacity: 0.9; font-size: 1.1rem; }

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.intro p, .analysis li, .methodology p { font-size: 1.05rem; }

.chart-section h2 { margin-top: 0; color: var(--accent); }
.chart-section p { color: var(--muted); margin-top: -0.5rem; }

.chart-container {
  position: relative;
  height: 380px;
  width: 100%;
}

ul { padding-left: 1.5rem; }
li { margin-bottom: 0.5rem; }

.analysis { background: #eef5fc; border-color: #c5d9ed; }
.analysis h2 { color: var(--accent); margin-top: 0; }

.simulator { background: #f4f8ec; border-color: #d6e4c5; }
.simulator h2 { color: var(--accent); margin-top: 0; }

.simulator-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

.sliders { display: flex; flex-direction: column; gap: 0.75rem; }

.slider-row {
  display: grid;
  grid-template-columns: 1fr 80px 70px;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  background: white;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.slider-row label { font-size: 0.9rem; font-weight: 500; }
.slider-row input[type="range"] { width: 100%; }
.slider-row .pct { text-align: right; font-variant-numeric: tabular-nums; }

.simulator-summary { display: flex; flex-direction: column; gap: 1rem; }

.summary-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  text-align: center;
}

.summary-card .big {
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: 0.25rem;
}

#balanceCard.deficit { background: #fce8e6; border-color: #e7b0ab; }
#balanceCard.surplus { background: #e6f4ea; border-color: #a8dab5; }

.chart-container.small { height: 220px; }

@media (max-width: 800px) {
  .simulator-layout { grid-template-columns: 1fr; }
}

.methodology { font-size: 0.95rem; color: var(--muted); }
.methodology a { color: var(--accent); }

footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 600px) {
  header h1 { font-size: 1.5rem; }
  .chart-container { height: 300px; }
}