:root{--color-bg:#ffffff;--color-surface:#fafbfc;--color-text:#0f172a;--color-text-muted:#64748b;--color-border:#e2e8f0;--color-accent:#3b82f6;--color-error:#ef4444;--color-success:#22c55e;--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--spacing-xs:0.25rem;--spacing-sm:0.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--radius-sm:4px;--radius-md:8px;--radius-lg:12px}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background-color:var(--color-surface);color:var(--color-text);line-height:1.5;min-height:100vh}h1,h2,h3,h4,h5,h6{line-height:1.2;font-weight:600}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.25rem}p{margin-bottom:var(--spacing-md)}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline}:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}