:root {
  --bg: #0b0f17;
  --bg2: #111827;
  --card: #131c2c;
  --border: #1f2a3f;
  --text: #d7dfeb;
  --muted: #8b98ad;
  --accent: #4f8cff;
  --accent2: #a78bfa;
  --green: #34d399;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.7 -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}
.rb-nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px; background: rgba(11,15,23,.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.rb-brand { font-weight: 800; font-size: 17px; color: #fff; text-decoration: none; letter-spacing: .2px; }
.rb-tag { color: var(--muted); font-size: 12.5px; }
.rb-progress { height: 3px; background: var(--bg2); }
.rb-progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2)); }
.rb-main { max-width: 860px; margin: 0 auto; padding: 36px 24px 60px; }
.rb-article {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px 48px;
}
.rb-article h1 { color: #fff; font-size: 30px; line-height: 1.25; margin-top: 0; border-bottom: 1px solid var(--border); padding-bottom: 16px; }
.rb-article h2 { color: var(--accent2); font-size: 22px; margin-top: 40px; border-left: 3px solid var(--accent); padding-left: 12px; }
.rb-article h3 { color: #c9d6e8; font-size: 17px; margin-top: 28px; }
.rb-article a { color: var(--accent); text-decoration: none; }
.rb-article a:hover { text-decoration: underline; }
.rb-article strong { color: #fff; }
.rb-article blockquote {
  margin: 18px 0; padding: 14px 18px; background: var(--bg2);
  border-left: 3px solid var(--green); border-radius: 6px; color: #c8d3e2;
}
.rb-article blockquote p { margin: 4px 0; }
.rb-article code {
  background: var(--bg2); border: 1px solid var(--border);
  padding: 1px 6px; border-radius: 5px; font-size: .88em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: #9ecbff;
}
.rb-article pre {
  background: #0a0f18; border: 1px solid var(--border); border-radius: 8px;
  padding: 16px 18px; overflow-x: auto; font-size: 13.5px; line-height: 1.6;
}
.rb-article pre code { background: none; border: none; padding: 0; color: #d7dfeb; }
.rb-article ul, .rb-article ol { padding-left: 22px; }
.rb-article li { margin: 6px 0; }
.rb-article li::marker { color: var(--accent2); }
.rb-article input[type="checkbox"] { accent-color: var(--accent); margin-right: 8px; }
.rb-article table {
  width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14.5px;
  display: block; overflow-x: auto;
}
.rb-article th { background: var(--bg2); color: #fff; text-align: left; }
.rb-article th, .rb-article td { border: 1px solid var(--border); padding: 9px 13px; vertical-align: top; }
.rb-article tr:nth-child(even) td { background: rgba(255,255,255,.02); }
.rb-pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 26px; }
.rb-page-btn {
  background: var(--card); border: 1px solid var(--border); color: var(--text);
  padding: 10px 16px; border-radius: 8px; text-decoration: none; font-size: 14px;
}
.rb-page-btn:hover { border-color: var(--accent); color: #fff; }
.rb-page-btn.next { margin-left: auto; }
.rb-footer { margin-top: 22px; color: var(--muted); font-size: 13px; text-align: center; }
.rb-footer a { color: var(--muted); }
@media (max-width: 640px) {
  .rb-article { padding: 22px 16px; }
  .rb-nav { padding: 12px 14px; }
  .rb-tag { display: none; }
}