:root{--bg-color: #ffffff;--text-color: #1a1a1a;--link-color: #0066cc;--link-hover: #004499}@media (prefers-color-scheme: dark){:root{--bg-color: #2a2a2a;--text-color: #e5e5e5;--link-color: #66b3ff;--link-hover: #99ccff}}*{margin:0;padding:0;box-sizing:border-box}body{background-color:var(--bg-color);color:var(--text-color);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;font-size:16px;line-height:1.6}.center-content{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;max-width:800px;margin:0 auto}.container{padding:2rem}a{color:var(--link-color);text-decoration:none}a:hover{color:var(--link-hover);text-decoration:underline}h1,h2,h3,h4,h5,h6{margin-top:1.5rem;margin-bottom:.5rem}