:root{--font-sans: "Inter", system-ui, -apple-system, sans-serif;--color-text: #111827;--color-text-muted: #6b7280;--color-border: #e5e7eb;--color-bg: #fff;--color-bg-muted: #f3f4f6;--color-accent: #2563eb;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--max-w: 800px;--header-h: 58px}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font-sans);color:var(--color-text);background:var(--color-bg);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{line-height:1.2;margin-top:0;letter-spacing:-.02em}