:root{--color-primary:#000;--color-primary-light:#333;--color-accent:#2563eb;--color-accent-hover:#1d4ed8;--color-text-primary:#1a1a1a;--color-text-secondary:#666;--color-text-muted:#888;--color-bg-primary:#fff;--color-bg-secondary:#f8f9fa;--color-bg-tertiary:#f0f0f0;--color-border:#e5e5e5;--color-border-light:#f0f0f0;--font-family-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--font-family-mono:"SF Mono",Monaco,"Cascadia Code","Roboto Mono",monospace;--max-width-content:1200px;--max-width-article:800px}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-family-sans);color:var(--color-text-primary);background-color:var(--color-bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;font-size:1rem;line-height:1.5}img{max-width:100%;height:auto;display:block}a{color:var(--color-accent);text-decoration:none;transition:color .15s}a:hover{color:var(--color-accent-hover)}h1,h2,h3,h4,h5,h6{color:var(--color-text-primary);margin:0 0 1rem;font-weight:700;line-height:1.25}p{margin:0 0 1rem}ul,ol{margin:0;padding:0}