:root {
  --blue: #2563eb;
  --green: #059669;
  --yellow: #facc15;
  --red: #dc2626;
  --purple: #7c3aed;
  --bg: #f9fafb;
  --text: #1f2937;
  --card: #ffffff;
}

body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 0;
}

/* Header */
.site-header {
  background: var(--blue);
  color: #fff;
}
.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand a {
  color: #fff;
  font-weight: bold;
  text-decoration: none;
  font-size: 1.2rem;
}
.site-nav a {
  color: #e0e7ff;
  margin-left: 1rem;
  text-decoration: none;
}
.site-nav a.active, .site-nav a:hover {
  color: #fff;
}

/* Hero */
.hero {
  background: var(--card);
  padding: 2rem;
  margin: 1.5rem 0;
  border-radius: 0.5rem;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.hero h1 {
  margin-top: 0;
  font-size: 2rem;
  color: var(--blue);
}
.btn {
  display: inline-block;
  background: var(--green);
  color: #fff;
  padding: 0.6rem 1.2rem;
  border-radius: 0.4rem;
  text-decoration: none;
  margin-top: 1rem;
}

/* Sections */
.content-block {
  background: var(--card);
  padding: 1.5rem;
  border-radius: 0.5rem;
  margin: 1.5rem 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.features-grid article {
  background: #f3f4f6;
  padding: 1rem;
  border-radius: 0.4rem;
}

/* Charts */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.chart-card {
  background: var(--card);
  padding: 1rem;
  border-radius: 0.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.contact-card {
  background: #f3f4f6;
  padding: 1rem;
  border-radius: 0.4rem;
}

/* Footer */
.site-footer {
  background: var(--blue);
  color: #fff;
  padding: 1rem 0;
  text-align: center;
  margin-top: 2rem;
}