.rules-hero {
  padding: calc(var(--nav) + 48px) 0 28px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.rules-hero h1 {
  margin-top: 8px;
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  text-shadow: none;
}

.rules-lead {
  max-width: 620px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 1.08rem;
}

.doc-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.doc-tabs button {
  height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.92rem;
}

.doc-tabs button.is-on,
.doc-tabs button:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.18);
  color: #fff;
  box-shadow: none;
}

.rules-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  padding: 36px 0 80px;
}

.toc {
  position: sticky;
  top: calc(var(--nav) + 18px);
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
}

.toc h2 {
  font-family: "Space Grotesk", Figtree, sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

.toc nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc a {
  padding: 8px 10px;
  border-radius: 6px;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
}

.toc a:hover,
.toc a.is-on {
  color: #fff;
  background: rgba(11, 107, 255, 0.16);
}

.doc {
  min-width: 0;
}

.doc-pane h2 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  margin-bottom: 12px;
}

.doc-intro {
  color: #d7dde8;
  font-size: 1.08rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.doc-pane > p {
  color: var(--muted);
  max-width: 72ch;
  margin-bottom: 12px;
  line-height: 1.65;
}

.callout {
  margin: 20px 0 28px;
  padding: 16px 18px;
  border-left: 3px solid var(--blue);
  background: rgba(11, 107, 255, 0.08);
  border-radius: 0 10px 10px 0;
}

.callout strong {
  display: block;
  margin-bottom: 6px;
}

.callout p { color: var(--muted); margin: 0; }

.doc-jump {
  color: var(--blue-2);
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.doc-pane section {
  padding-top: 28px;
  margin-top: 12px;
  border-top: 1px solid var(--line);
}

.doc-pane h3 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 16px;
}

.doc-pane h4 {
  font-family: "Space Grotesk", Figtree, sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  margin: 18px 0 8px;
  color: #fff;
}

.doc-pane ol {
  padding-left: 1.2rem;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 72ch;
}

.doc-pane li { line-height: 1.6; }
.doc-pane li strong { color: #fff; }

@media (max-width: 980px) {
  .rules-layout { grid-template-columns: 1fr; }
  .toc { position: static; }
  .doc-tabs button { width: 100%; }
}