* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, sans-serif; line-height: 1.6; background: #fafafa; color: #333; }
.container { max-width: 900px; margin: 0 auto; padding: 1.25rem; }
header { text-align: center; padding: 2rem 1rem; background: #fff; border-bottom: 1px solid #ddd; }
header h1 { margin-bottom: .25rem; font-size: 2rem; }
header p { color: #555; }
nav a { margin: 0 .75rem; text-decoration: none; color: #0077cc; font-weight: bold; }
h2 { margin: 2rem 0 1rem; font-size: 1.5rem; }
.card { background: #fff; padding: 1rem; margin: 1rem 0; border-radius: 12px; box-shadow: 0 2px 6px rgba(0,0,0,.05); }
footer { text-align: center; padding: 2rem 0; margin-top: 2rem; border-top: 1px solid #ddd; }