*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: sans-serif; line-height: 1.6; }
.header { position: fixed; top: 0; left: 0; width: 100%; height: 80px; background: #fff; border-bottom: 1px solid #eee; display: flex; align-items: center; justify-content: space-between; padding: 0 2rem; z-index: 1000; }
.footer { position: fixed; bottom: 0; left: 0; width: 100%; height: 60px; background: #333; color: #fff; display: flex; align-items: center; justify-content: center; z-index: 1000; }
#scroll-container { padding-top: 80px; padding-bottom: 60px; }
section { padding: 4rem 2rem; max-width: 1000px; margin: 0 auto; }