/* ============================================================
   Cloud Reader — Reading View Styles
   Mobile-first reading experience with theme support
   ============================================================ */

/* --- CSS Custom Properties (overridden by JS) --- */
:root {
  --reader-bg: #f5f0eb;
  --reader-text: #1a1a1a;
  --reader-font-family: Georgia, "Times New Roman", serif;
  --reader-font-size: 18px;
  --reader-line-height: 1.6;
  --reader-margin: 16px;
  --reader-brightness: 100%;
  --reader-toolbar-bg: rgba(26, 26, 26, 0.95);
  --reader-toolbar-text: #e0e0e0;
  --reader-accent: #6c8cff;
}

/* --- Reading Container --- */
.reader-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--reader-bg);
  color: var(--reader-text);
  font-family: var(--reader-font-family);
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  filter: brightness(var(--reader-brightness));
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow: hidden;
}

/* Orientation lock */
@supports (--reader-orientation: portrait) {
  .reader-container {
    orientation: var(--reader-orientation);
  }
}

@media (orientation: landascape) {
  .reader-container {
    --reader-margin: 24px;
  }
}

/* --- Top Toolbar --- */
.reader-top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 52px;
  background: var(--reader-toolbar-bg);
  color: var(--reader-toolbar-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  z-index: 120;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.reader-bar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  color: var(--reader-toolbar-text);
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.15s;
}

.reader-bar-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.reader-bar-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  min-width: 0;
  flex: 1;
  padding: 0 8px;
}

.reader-bar-book {
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.reader-bar-chapter {
  font-size: 0.7rem;
  opacity: 0.7;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* --- Progress Bar --- */
.reader-progress-bar {
  position: fixed;
  top: 52px;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 120;
}

.reader-progress-fill {
  height: 100%;
  background: var(--reader-accent);
  transition: width 0.3s ease;
}

/* --- Main Content Area --- */
.reader-content {
  flex: 1;
  overflow-y: auto;
  padding: 72px var(--reader-margin) 72px;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

/* --- Chapter Article --- */
.reader-chapter {
  max-width: 680px;
  margin: 0 auto;
}

.reader-chapter-title {
  font-size: 1.6em;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75em;
  padding-bottom: 0.5em;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  color: var(--reader-text);
}

/* Chapter body — content from API (could be HTML/markdown-rendered) */
.reader-chapter-body {
  font-size: 1em;
  line-height: var(--reader-line-height);
}

.reader-chapter-body p {
  margin-bottom: 1.2em;
  text-align: justify;
  hyphens: auto;
}

.reader-chapter-body h2,
.reader-chapter-body h3,
.reader-chapter-body h4 {
  margin-top: 1.5em;
  margin-bottom: 0.6em;
  line-height: 1.3;
}

.reader-chapter-body blockquote {
  border-left: 3px solid var(--reader-accent);
  padding-left: 1em;
  margin: 1em 0;
  opacity: 0.85;
  font-style: italic;
}

.reader-chapter-body img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 1em 0;
}

.reader-chapter-body ul,
.reader-chapter-body ol {
  padding-left: 1.5em;
  margin-bottom: 1.2em;
}

.reader-chapter-body li {
  margin-bottom: 0.4em;
}

/* --- Navigation Bar (Bottom) --- */
.reader-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--reader-toolbar-bg);
  color: var(--reader-toolbar-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  z-index: 120;
  gap: 8px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.reader-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  color: var(--reader-toolbar-text);
  font-size: 0.85rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  cursor: pointer;
  transition: all 0.15s;
}

.reader-nav-btn:hover:not(.reader-nav-btn--disabled) {
  border-color: var(--reader-accent);
  color: var(--reader-accent);
}

.reader-nav-btn--disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.reader-nav-btn--back {
  background: rgba(108, 140, 255, 0.15);
  border-color: rgba(108, 140, 255, 0.3);
}

.reader-nav-btn--back:hover {
  background: rgba(108, 140, 255, 0.25);
  color: var(--reader-accent);
}

/* --- TOC Drawer --- */
.toc-overlay,
.settings-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 130;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.toc-drawer,
.settings-drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 300px;
  max-width: 85vw;
  background: var(--reader-toolbar-bg);
  color: var(--reader-toolbar-text);
  z-index: 140;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toc-drawer {
  left: 0;
  transform: translateX(-100%);
}

.toc-drawer--open {
  transform: translateX(0);
}

.settings-drawer {
  right: 0;
  transform: translateX(100%);
}

.settings-drawer--open {
  transform: translateX(0);
}

.toc-header,
.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.toc-title,
.settings-title {
  font-size: 1.1rem;
  font-weight: 700;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.toc-close-btn,
.settings-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  color: var(--reader-toolbar-text);
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.15s;
}

.toc-close-btn:hover,
.settings-close-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* --- TOC List --- */
.toc-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.toc-empty {
  padding: 24px 16px;
  text-align: center;
  opacity: 0.6;
  font-size: 0.9rem;
}

.toc-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px 16px;
  background: transparent;
  border: none;
  color: var(--reader-toolbar-text);
  font-size: 0.9rem;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s;
  font-family: inherit;
}

.toc-item:hover {
  background: rgba(255, 255, 255, 0.08);
}

.toc-item--active {
  background: rgba(108, 140, 255, 0.15);
  color: var(--reader-accent);
  font-weight: 600;
}

.toc-item-number {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.1);
  padding: 0 4px;
}

.toc-item-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --- Settings Panel --- */
.settings-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px 32px;
}

.settings-section {
  margin-bottom: 20px;
}

.settings-section-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Theme grid */
.theme-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.theme-btn {
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  background: transparent;
  color: var(--reader-toolbar-text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.theme-btn:hover {
  border-color: rgba(255, 255, 255, 0.3);
}

.theme-btn--active {
  border-color: var(--reader-accent);
  background: rgba(108, 140, 255, 0.15);
  color: var(--reader-accent);
  font-weight: 600;
}

/* Font grid */
.font-grid,
.orientation-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.font-btn,
.orientation-btn {
  padding: 10px 8px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  background: transparent;
  color: var(--reader-toolbar-text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.font-btn:hover,
.orientation-btn:hover {
  border-color: rgba(255, 255, 255, 0.3);
}

.font-btn--active,
.orientation-btn--active {
  border-color: var(--reader-accent);
  background: rgba(108, 140, 255, 0.15);
  color: var(--reader-accent);
  font-weight: 600;
}

/* Sliders */
.settings-slider {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.settings-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--reader-accent);
  border: 2px solid white;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.settings-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--reader-accent);
  border: 2px solid white;
  cursor: pointer;
}

/* --- Start Reading Button (in book detail) --- */
.start-reading-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--reader-accent);
  border: none;
  border-radius: 8px;
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 16px;
  margin-bottom: 16px;
  font-family: inherit;
}

.start-reading-btn:hover {
  background: #5a7ae8;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(108, 140, 255, 0.3);
}

/* --- Loading State --- */
.reader-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 48px;
  color: var(--reader-text);
}

.reader-error {
  color: #ef4444;
  text-align: center;
}

/* --- Responsive --- */
@media (max-width: 480px) {
  .reader-chapter {
    max-width: 100%;
  }

  .reader-nav-btn {
    padding: 8px 10px;
    font-size: 0.8rem;
  }

  .reader-nav-btn span {
    display: none;
  }

  .toc-drawer,
  .settings-drawer {
    max-width: 100vw;
  }

  .reader-chapter-title {
    font-size: 1.3em;
  }
}

@media (min-width: 768px) {
  .reader-chapter {
    max-width: 720px;
  }

  .reader-chapter-body {
    font-size: 1.05em;
  }
}

/* --- Landscape on Mobile --- */
@media (orientation: landscape) and (max-height: 500px) {
  .reader-top-bar {
    height: 44px;
  }

  .reader-content {
    padding-top: 60px;
    padding-bottom: 60px;
  }

  .reader-chapter-title {
    font-size: 1.2em;
  }
}

/* --- Dark mode theme override when reader uses light theme but system is dark --- */
@media (prefers-color-scheme: dark) {
  .reader-container[data-theme="light"] {
    --reader-toolbar-bg: rgba(255, 255, 255, 0.95);
    --reader-toolbar-text: #1a1a1a;
  }
}