body{max-width:820px;margin:0 auto;padding:48px 24px 80px;font-family:-apple-system,'Segoe UI',Roboto,sans-serif;line-height:1.6;color:#1a2230;background:#f7f9fc}
h1,h2,h3,h4{line-height:1.2;letter-spacing:-0.01em;color:#0d1320;margin-top:1.6em}
h1{font-size:2em;border-bottom:2px solid #2C64E3;padding-bottom:.3em}
h2{font-size:1.45em} h3{font-size:1.15em}
a{color:#2C64E3} code{background:#eef2fb;padding:1px 5px;border-radius:5px;font-size:.9em}
table{border-collapse:collapse;width:100%;margin:1em 0;font-size:.92em}
th,td{border:1px solid #dde3ee;padding:8px 10px;text-align:left}
th{background:#eef2fb}
blockquote{border-left:3px solid #2C64E3;margin:1em 0;padding:.3em 1em;background:#eef4ff;color:#3a4a66}
hr{border:none;border-top:1px solid #dde3ee;margin:2em 0}
.back{position:fixed;top:14px;left:14px;background:#2C64E3;color:#fff;padding:8px 14px;border-radius:999px;text-decoration:none;font-size:13px;box-shadow:0 4px 14px rgba(44,100,227,.3)}