*,:after,:before{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#fff;--color-text:#1a1a1a;--color-text-muted:#6b7280;--color-border:#e5e7eb;--color-accent:#2563eb;--color-accent-hover:#1d4ed8;--color-surface:#f9fafb;--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--max-width:760px;--section-gap:5rem;--radius:6px}html{scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-sans);background-color:var(--color-bg);color:var(--color-text);line-height:1.7;-webkit-font-smoothing:antialiased}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline;color:var(--color-accent-hover)}img{max-width:100%;display:block}ul{list-style:none}.container{max-width:var(--max-width);margin:0 auto;padding:0 1.5rem}