/* Basis */
body { font-family: system-ui, sans-serif; line-height: 1.5; }
header, main, footer { max-width: 800px; margin: 0 auto; }

/* Header */
header { background: #f5f5f5; padding: 16px; border-bottom: 1px solid #ddd; }
.tagline { color: #666; }

/* Cards */
.card { background: white; border: 1px solid #ddd; padding: 16px; margin: 16px 0; }
.card h2 { margin-top: 0; }
.card.highlight { border-color: #6aa6ff; }

/* Knop */
.btn { display: inline-block; padding: 8px 12px; border: 1px solid #333; text-decoration: none; }