/* ============================================
   Bookshelf Theme - Reading Page Styles
   ============================================ */

/* --- Reading Layout --- */
.reading-layout {
  display: flex;
  gap: 1.5rem;
  min-height: calc(100vh - 200px);
}

.reading-main {
  flex: 1;
  min-width: 0;
}

.reading-sidebar {
  width: 280px;
  flex-shrink: 0;
}

/* --- Reading Header --- */
.reading-header {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.reading-header .reading-book-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-dark);
  margin: 0;
}

.reading-header .reading-chapter-title {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0;
}

.reading-header .sidebar-toggle {
  display: none;
  background: none;
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius);
  color: var(--shelf-wood);
  padding: 0.3rem 0.6rem;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.reading-header .sidebar-toggle:hover {
  background-color: var(--shelf-wood);
  color: #fff;
}

/* --- Reading Content --- */
.reading-content {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius);
  padding: 2rem 2.5rem;
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-body);
}

.reading-content p {
  margin-bottom: 1rem;
  text-indent: 2em;
}

.reading-content h1,
.reading-content h2,
.reading-content h3 {
  text-indent: 0;
}

/* --- Chapter Navigation (Bottom) --- */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.chapter-nav .btn {
  min-width: 140px;
}

/* --- Sidebar Chapter List --- */
.sidebar-chapters {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius);
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
}

.sidebar-chapters .sidebar-header {
  padding: 0.85rem 1rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-dark);
  border-bottom: 1px solid var(--card-border);
  background-color: var(--bg-warm);
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  position: sticky;
  top: 0;
  z-index: 1;
}

.sidebar-chapters .chapter-list {
  padding: 0.5rem 0;
}

.sidebar-chapters .chapter-list li a {
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
}

.sidebar-chapters .chapter-list li a.active {
  background-color: var(--shelf-wood);
  color: #fff;
  border-radius: 0;
}

.sidebar-chapters .chapter-list li a.active .chapter-index {
  color: rgba(255, 255, 255, 0.7);
}

/* --- Responsive --- */
@media (max-width: 991.98px) {
  .reading-sidebar {
    width: 240px;
  }

  .reading-content {
    padding: 1.5rem;
  }
}

@media (max-width: 767.98px) {
  .reading-layout {
    flex-direction: column;
  }

  .reading-sidebar {
    width: 100%;
    display: none;
  }

  .reading-sidebar.show {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    z-index: 1050;
    overflow-y: auto;
    box-shadow: 4px 0 16px rgba(0, 0, 0, 0.3);
  }

  .reading-header .sidebar-toggle {
    display: inline-flex;
  }

  .reading-content {
    padding: 1rem;
    font-size: 1rem;
  }

  .chapter-nav {
    flex-direction: column;
    gap: 0.5rem;
  }

  .chapter-nav .btn {
    width: 100%;
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1040;
  }

  .sidebar-overlay.show {
    display: block;
  }
}