:root {
  --bg-color: #f4f6f4;
  --card-bg: #ffffff;
  --text-main: #2c3e2d;
  --accent: #3b5d3b;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  margin: 0;
  padding: 20px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

h1 {
  font-size: 1.5rem;
  margin: 0;
}

button {
  background-color: var(--accent);
  color: white;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
}

#catalogo-tessere {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.tessera-card {
  background-color: var--card-bg;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tessera-card h3 {
  margin: 0;
  font-size: 1.2rem;
}

.codice-barre {
  font-family: monospace;
  background: #f0f4f0;
  padding: 10px;
  text-align: center;
  letter-spacing: 2px;
  font-size: 1.2rem;
  border-radius: 6px;
}