/* book-reader.css */

:root {
  /* Vintage Light Theme Variables */
  --reader-bg: #fdfaf3; /* warm off-white, paper-like */
  --reader-surface: #fdfaf3;
  --reader-text: #2b2b2b;
  --reader-accent: #d4952c;
  --reader-border: #e2dcd0;
  --reader-muted: #6b6b6b;
  --font-multiplier: 1;

  /* Font Families */
  --font-vintage: 'Playfair Display', serif;
  --font-modern: 'Space Grotesk', sans-serif;
  --font-regular: 'Inter', sans-serif;
  
  --reader-font-family: var(--font-vintage);
}

/* Dark Theme Variables */
body.theme-dark {
  --reader-bg: #1a1a1a;
  --reader-surface: #262626;
  --reader-text: #e0e0e0;
  --reader-accent: #d4952c;
  --reader-border: #444;
  --reader-muted: #a0a0a0;
}

/* Base Body Styles for the Reader Page */
body {
  background-color: var(--reader-bg);
  color: var(--reader-text);
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
}

/* Container simulating a page */
.reader-container {
  max-width: 1000px;
  margin: 6rem auto 2rem; /* Increased top margin for nav overlap */
  padding: 0 1rem;
}

.reader-paper {
  background-color: var(--reader-surface);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  border-radius: 8px;
  padding: 3rem 4rem;
  border: 1px solid var(--reader-border);
  transition: all 0.3s ease;
}

body.theme-dark .reader-paper {
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

/* Header Area: Refined Boxy */
.reader-header-wrap {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  margin-bottom: 2rem;
  gap: 1.5rem;
}

.reader-title-area {
  width: 100%;
  text-align: left;
}

.book-title {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 2.8rem;
  margin: 0 0 0.5rem 0;
  letter-spacing: -0.03em;
  color: var(--reader-text);
  text-transform: uppercase;
  line-height: 1.1;
}

.book-subtitle {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--reader-muted);
  margin: 0;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

/* Controls */
.reader-controls {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1rem;
  width: 100%;
  margin-top: 0;
}

.control-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: nowrap;
  justify-content: space-between;
  width: 100%;
}

.outline-btn {
  background: var(--reader-surface);
  border: 1px solid var(--reader-border);
  color: var(--reader-text);
  padding: 0.75rem 1rem;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s ease;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: none;
  flex: 1 1 0;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

.outline-btn:hover {
  background: var(--reader-text);
  color: var(--reader-bg);
  border-color: var(--reader-text);
}

/* Progress Box */
.progress-box {
  display: block;
  background: transparent;
  border: 1px solid var(--reader-border);
  border-radius: 2px;
  padding: 1rem 1.2rem;
  width: 100%;
  text-align: left;
  box-sizing: border-box;
  border-left: 4px solid var(--reader-accent);
  box-shadow: none;
}

body.theme-dark .progress-box {
  box-shadow: none;
}

.progress-label {
  display: block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--reader-muted);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
}

.progress-track {
  width: 100%;
  height: 4px;
  background-color: var(--reader-border);
  border-radius: 0;
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress-fill {
  height: 100%;
  background-color: var(--reader-text);
  width: 33%; /* dynamic */
  transition: width 0.3s ease;
}

.progress-text {
  display: block;
  text-align: right;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--reader-text);
}

/* Divder */
.reader-divider {
  border: none;
  border-top: 1px solid var(--reader-border);
  margin: 1.5rem 0 2rem 0;
}

/* Content Area */
.reader-content {
  font-family: var(--reader-font-family);
  color: var(--reader-text);
  line-height: 1.5;
  /* Base font size scaling with Javascript control */
  font-size: calc(1.15rem * var(--font-multiplier));
}

.chapter-title {
  font-family: var(--reader-font-family);
  font-size: calc(1.5rem * var(--font-multiplier));
  margin-bottom: 0.2rem;
  font-weight: 400;
}

.chapter-differentiator {
  border: none;
  border-top: 1px solid var(--reader-muted);
  margin: 1rem auto 2.5rem;
  width: 50px;
  opacity: 0.5;
}

.chapter-subtitle {
  font-family: 'Inter', sans-serif;
  font-size: calc(0.9rem * var(--font-multiplier));
  color: var(--reader-muted);
  margin-top: 0;
  margin-bottom: 2rem;
  font-style: italic;
}

.chapter-body p {
  margin-bottom: 1.2em;
  text-indent: 0;
}

/* Dropcap Style for first letter if desired */
.dropcap {
  float: left;
  font-size: calc(4.5rem * var(--font-multiplier));
  line-height: 0.8;
  padding-top: 0.1rem;
  padding-right: 0.4rem;
  font-family: var(--reader-font-family);
  font-weight: 700;
  color: var(--reader-text);
}

/* Footer Navigation */
.reader-footer-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
}

.nav-button {
  padding: 0.6rem 1.2rem;
  font-size: 0.85rem;
  min-width: 100px;
}
.nav-button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Sidebar & Backdrop */
.sidebar-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(2px);
  z-index: 9998;
  opacity: 1;
  transition: opacity 0.3s ease;
}
.sidebar-backdrop.hidden {
  opacity: 0;
  pointer-events: none;
}
.chapters-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 320px;
  max-width: 85%;
  background: var(--reader-surface);
  border-right: 1px solid var(--reader-border);
  box-shadow: 4px 0 20px rgba(0,0,0,0.15);
  z-index: 9999;
  transform: translateX(0);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  padding: 2rem;
  color: var(--reader-text);
}
.chapters-sidebar.hidden {
  transform: translateX(-100%);
}
.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--reader-border);
  padding-bottom: 0.5rem;
}
.sidebar-header h3 {
  font-family: 'Inter', sans-serif;
  margin: 0;
}
.icon-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--reader-text);
  cursor: pointer;
}
.icon-btn:hover {
  color: var(--reader-accent);
}
.chapters-list {
  list-style: none;
  padding: 0;
  margin: 0;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.chapters-list li {
  margin: 0;
}
.chapter-nav-btn {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  text-align: left;
  padding: 0.75rem 1rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  font-family: 'Inter', sans-serif;
  color: var(--reader-text);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}
.chapter-nav-btn:hover {
  background: rgba(0, 0, 0, 0.03);
  border-color: var(--reader-border);
  transform: translateX(4px);
}
body.theme-dark .chapter-nav-btn:hover {
  background: rgba(255, 255, 255, 0.05);
}
.chapter-nav-btn.active {
  background: var(--reader-border);
}
.chapter-nav-btn.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 50%;
  width: 4px;
  background: var(--reader-accent);
  border-radius: 0 4px 4px 0;
}
.chapter-num {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--reader-muted);
  letter-spacing: 0.05em;
  flex-shrink: 0;
}
.chapter-nav-btn.active .chapter-num {
  color: var(--reader-accent);
}
.chapter-details {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
}
.chapter-name {
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--reader-text);
}
.chapter-nav-btn.active .chapter-name {
  font-weight: 700;
}
.chapter-list-subtitle {
  font-size: 0.75rem;
  font-style: italic;
  color: var(--reader-muted);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .reader-container {
    margin: 5rem auto 1rem;
    padding: 0 0.5rem;
  }
  .reader-paper {
    padding: 2rem 1.5rem;
  }
  .reader-header-wrap {
    flex-direction: column;
    gap: 1.5rem;
    align-items: flex-start;
  }
  .reader-controls {
    align-items: stretch;
    width: 100%;
  }
  /* Make sure controls fit nicely rather than breaking layout */
  .control-buttons {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .outline-btn {
    flex: 1 1 auto;
    text-align: center;
    padding: 0.6rem 0.5rem;
    min-width: fit-content;
  }
  .progress-box {
    width: 100%;
    box-sizing: border-box;
  }
  .book-title {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .reader-container {
    margin: 4.5rem auto 0;
    padding: 0;
  }
  .reader-paper {
    padding: 1.5rem 1rem;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
  .book-title {
    font-size: 1.6rem;
  }
  .dropcap {
    font-size: calc(3.5rem * var(--font-multiplier));
  }
  .outline-btn {
    padding: 0.5rem 0.4rem;
    font-size: 0.65rem;
    flex: 1 1 auto;
    min-width: auto;
  }
  .reader-content {
    font-size: calc(1rem * var(--font-multiplier));
  }
  .chapter-title {
    font-size: calc(1.3rem * var(--font-multiplier));
  }
  .reader-footer-nav {
    flex-direction: column;
    gap: 1rem;
  }
  .nav-button {
    width: 100%;
  }
  .chapters-sidebar {
    width: 100%;
    max-width: 100%;
    padding: 1.5rem 1rem;
    box-sizing: border-box;
  }
  .chapter-nav-btn {
    padding: 0.6rem 0.5rem;
    gap: 0.5rem;
  }
  .chapter-name {
    font-size: 0.85rem;
  }
}