body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0a0a0a;
  color: #fff;
}

/* HEADER */
.guide-header {
  background: #000;
  padding: 20px;
  text-align: center;
  font-size: 26px;
  font-weight: bold;
}

.logo span {
  color: #ff4444;
}

/* LAYOUT */
.guide-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  height: calc(100vh - 80px);
}

/* SIDEBAR */
.guide-sidebar {
  background: #111;
  padding: 20px;
  border-right: 1px solid #222;
  overflow-y: auto;
}

.guide-sidebar h3 {
  margin-bottom: 10px;
  font-size: 18px;
}

#chapter-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

#chapter-list li {
  padding: 12px;
  margin-bottom: 6px;
  background: #1a1a1a;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s;
}

#chapter-list li:hover {
  background: #222;
}

#chapter-list li.active {
  background: #ff4444;
}

/* CONTENT */
.guide-content {
  padding: 30px;
  overflow-y: auto;
}

.chapter {
  display: none;
}

.chapter.active {
  display: block;
}

/* CINEMATIC SCROLLBAR */
.guide-content::-webkit-scrollbar,
.guide-sidebar::-webkit-scrollbar {
  width: 10px;
}

.guide-content::-webkit-scrollbar-thumb,
.guide-sidebar::-webkit-scrollbar-thumb {
  background: #ff4444;
  border-radius: 10px;
}

.guide-content::-webkit-scrollbar-track,
.guide-sidebar::-webkit-scrollbar-track {
  background: #111;
}