:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.7;font-weight:400;--bg-main: #f7f8fb;--bg-card: #ffffff;--text-main: #111827;--text-muted: #6b7280;--primary: #4f46e5;--primary-soft: #eef2ff;--border-soft: #e5e7eb;color:var(--text-main);background-color:var(--bg-main);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:flex;justify-content:center;align-items:flex-start;background-color:var(--bg-main)}main{width:100%;max-width:860px;margin-top:4rem;margin-bottom:4rem;padding:2.5rem 2rem;background-color:var(--bg-card);border-radius:12px;border:1px solid var(--border-soft)}h1{font-size:2.4rem;line-height:1.3;margin-bottom:1rem;color:var(--text-main)}h2{font-size:1.4rem;margin-top:2.8rem;margin-bottom:.75rem;color:var(--text-main)}p{margin:.75rem 0;color:var(--text-main)}p.muted{color:var(--text-muted);font-size:.95rem}ol,ul{padding-left:1.4rem;margin-top:1.2rem}li{margin-bottom:1.2rem}li strong{color:var(--primary)}li p{margin-top:.35rem;color:var(--text-muted)}hr{border:none;border-top:1px solid var(--border-soft);margin:3rem 0}a{color:var(--primary);text-decoration:none;font-weight:500}a:hover{text-decoration:underline}button{margin-top:2rem;padding:.65em 1.6em;font-size:1rem;font-family:inherit;border-radius:8px;border:1px solid var(--primary);background-color:var(--primary);color:#fff;cursor:pointer;transition:background-color .2s ease,transform .1s ease}button:hover{background-color:#4338ca}button:active{transform:translateY(1px)}button:focus{outline:none;box-shadow:0 0 0 3px #4f46e540}@media(max-width:640px){main{margin-top:2rem;padding:2rem 1.25rem}h1{font-size:2rem}}.rule-box{background-color:#f9fafb;border:1px solid #e5e7eb;border-left:4px solid #2563eb;padding:1rem 1.25rem;margin:1.25rem 0;border-radius:6px}.rule-box h3{margin-top:0;margin-bottom:.75rem;font-size:1rem;color:#111827}.rule-box pre{margin:0;white-space:pre-wrap}