.rulebook-shell {
  min-height: 100vh;
}

.rulebook-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  width: min(100%, 1100px);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: rgba(15, 23, 42, 0.94);
  backdrop-filter: blur(12px);
}

.rulebook-brand {
  color: #93c5fd;
  font-size: 1.25rem;
  font-weight: 800;
  text-decoration: none;
}

.rulebook-brand:hover,
.rulebook-brand:focus-visible {
  color: #bfdbfe;
}

.rulebook-nav-actions,
.rulebook-page-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.rulebook-nav-actions a,
.rulebook-page-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 8px 16px;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
}

.rulebook-page {
  width: min(100%, 980px);
  margin: 0 auto;
  padding: 28px 24px 64px;
}

.rulebook-hero,
.rulebook-content,
.rulebook-game-card,
.rulebook-notice {
  border: 1px solid rgba(96, 165, 250, 0.18);
  background: rgba(26, 40, 68, 0.84);
  box-shadow: 0 24px 60px rgba(2, 8, 23, 0.28);
}

.rulebook-hero,
.rulebook-content {
  border-radius: 24px;
  padding: clamp(24px, 5vw, 44px);
}

.rulebook-hero h1,
.rulebook-content h1 {
  margin-top: 0;
  color: #f8fafc;
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.08;
}

.rulebook-hero p,
.rulebook-lead {
  max-width: 68ch;
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.7;
}

.rulebook-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.rulebook-game-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 220px;
  padding: 24px;
  border-radius: 18px;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.rulebook-game-card:hover,
.rulebook-game-card:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(96, 165, 250, 0.55);
  box-shadow: 0 28px 64px rgba(2, 8, 23, 0.4);
}

.rulebook-game-card:focus-visible {
  outline: 3px solid #38bdf8;
  outline-offset: 3px;
}

.rulebook-game-card h2 {
  margin: 0;
  color: #f8fafc;
}

.rulebook-game-card p {
  flex: 1;
  margin: 0;
  color: #cbd5e1;
  line-height: 1.6;
}

.rulebook-game-icon {
  font-size: 2rem;
}

.rulebook-content {
  color: #dbeafe;
}

.rulebook-content h2 {
  margin: 2.25rem 0 0.75rem;
  color: #93c5fd;
}

.rulebook-content h3 {
  margin: 1.5rem 0 0.5rem;
  color: #f8fafc;
}

.rulebook-content p,
.rulebook-content li {
  line-height: 1.7;
}

.rulebook-content li + li {
  margin-top: 0.45rem;
}

.rulebook-content strong {
  color: #f8fafc;
}

.rulebook-content code {
  color: #fde68a;
}

.rulebook-page-actions {
  margin-top: 28px;
}

.rulebook-notice {
  margin: 24px 0;
  padding: 24px;
  border-color: rgba(251, 191, 36, 0.35);
  border-radius: 16px;
  background: rgba(69, 45, 12, 0.45);
}

.rulebook-notice h2 {
  margin-top: 0;
  color: #fde68a;
}

@media (max-width: 680px) {
  .rulebook-nav {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding: 16px;
  }

  .rulebook-page {
    padding: 16px 16px 40px;
  }

  .rulebook-grid {
    grid-template-columns: 1fr;
  }

  .rulebook-hero,
  .rulebook-content {
    border-radius: 18px;
  }
}