/* E-Ink Optimized Style Sheet */

/* Font Declarations */
@import url('https://fonts.googleapis.com/css2?family=Merriweather:ital,wght@0,300;0,400;0,700;1,300&family=Outfit:wght@400;600;700&display=swap');

:root {
  /* Theme variables - Light Mode (Default) */
  --bg-color: #ffffff;
  --text-color: #000000;
  --border-color: #000000;
  --accent-color: #000000;
  --overlay-bg: #ffffff;
  --overlay-border: #000000;
  --font-serif: 'Merriweather', Georgia, serif;
  --font-sans: 'Outfit', Arial, sans-serif;
  --header-height: 60px;
  --footer-height: 120px;
}

/* CSS Theme Definitions */
body.theme-light {
  --bg-color: #ffffff;
  --text-color: #000000;
  --border-color: #000000;
  --accent-color: #000000;
  --overlay-bg: #ffffff;
  --overlay-border: #000000;
}

body.theme-sepia {
  --bg-color: #f4ecd8;
  --text-color: #5b4636;
  --border-color: #5b4636;
  --accent-color: #5b4636;
  --overlay-bg: #f4ecd8;
  --overlay-border: #5b4636;
}

body.theme-dark {
  --bg-color: #000000;
  --text-color: #ffffff;
  --border-color: #ffffff;
  --accent-color: #ffffff;
  --overlay-bg: #000000;
  --overlay-border: #ffffff;
}

/* Hard Disable Animations and Transitions (CRITICAL FOR E-INK) */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: none !important;
  animation: none !important;
  scroll-behavior: auto !important;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  overflow-x: hidden;
  height: 100vh;
  height: 100dvh; /* Adapt to dynamic mobile viewports */
  width: 100vw;
  display: flex;
  flex-direction: column;
}

/* Reset image behaviors for E-Ink */
img {
  max-width: 100%;
  height: auto;
  filter: grayscale(100%) contrast(120%);
}

/* Text elements */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--text-color);
}

p {
  line-height: 1.5;
}

/* Buttons */
.btn {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 16px;
  background-color: var(--bg-color);
  color: var(--text-color);
  border: 2px solid var(--border-color);
  padding: 10px 20px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn:active {
  background-color: var(--text-color);
  color: var(--bg-color);
}

.btn-primary {
  background-color: var(--text-color);
  color: var(--bg-color);
  border: 2px solid var(--border-color);
}

.btn-primary:active {
  background-color: var(--bg-color);
  color: var(--text-color);
}

.btn-outline {
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  font-size: 14px;
}

.btn-outline.active {
  background-color: var(--text-color);
  color: var(--bg-color);
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn svg {
  fill: var(--text-color);
}

.icon-btn:active {
  background-color: var(--text-color);
}
.icon-btn:active svg {
  fill: var(--bg-color);
}

/* View switcher */
.view-active {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
}

.view-hidden {
  display: none !important;
}

.hidden {
  display: none !important;
}

/* CATALOG VIEW STYLING */
.catalog-header {
  height: var(--header-height);
  border-bottom: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background-color: var(--bg-color);
}

.catalog-header h1 {
  font-size: 20px;
  font-family: var(--font-sans);
}

.catalog-main {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.book-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 600px) {
  .book-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .book-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.book-card {
  border: 2px solid var(--border-color);
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 140px;
  background-color: var(--bg-color);
}

.book-info {
  margin-bottom: 12px;
}

.book-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  margin-bottom: 4px;
}

.book-author {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  opacity: 0.8;
}

.book-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-tag {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  padding: 2px 6px;
}

/* Loading State and Error */
.loading-state, .empty-state {
  text-align: center;
  font-size: 18px;
  padding: 40px;
  border: 2px dashed var(--border-color);
  font-family: var(--font-sans);
}

.connection-error {
  background-color: var(--bg-color);
  color: var(--text-color);
  border: 2px solid var(--border-color);
  margin: 20px;
  padding: 15px;
  font-family: var(--font-sans);
  font-weight: bold;
  text-align: center;
}

/* Settings Dialog */
.settings-dialog {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

body.theme-dark .settings-dialog {
  background-color: rgba(255, 255, 255, 0.2);
}

.settings-dialog-content {
  background-color: var(--bg-color);
  border: 3px solid var(--border-color);
  padding: 24px;
  width: 90%;
  max-width: 400px;
}

.settings-dialog-content h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 14px;
}

.input-group input {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  font-size: 16px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* READER VIEW STYLING */
#reader-view {
  position: relative;
  height: 100vh;
  height: 100dvh; /* Mobile viewport safety */
  width: 100vw;
  overflow: hidden;
  background-color: var(--bg-color);
}

/* Tap Zones Layer */
.tap-zones {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  z-index: 100;
  pointer-events: auto; /* Handled in JS */
}

.tap-zone {
  height: 100%;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

#tap-zone-left {
  width: 20%;
}

#tap-zone-center {
  width: 60%;
}

#tap-zone-right {
  width: 20%;
}

/* EPUB Viewer Container */
#viewer-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 20px 40px; /* Margins for paginated text */
  z-index: 5;
  background-color: var(--bg-color);
}

#viewer {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

/* Reader UI Overlays */
.reader-overlay {
  position: absolute;
  left: 0;
  width: 100%;
  background-color: var(--overlay-bg);
  border: 2px solid var(--overlay-border);
  z-index: 150;
  display: flex;
  padding: 12px 20px;
}

.top-overlay {
  top: 0;
  height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  border-top: none;
  border-left: none;
  border-right: none;
}

.bottom-overlay {
  bottom: 0;
  flex-direction: column;
  gap: 12px;
  border-bottom: none;
  border-left: none;
  border-right: none;
}

.overlay-btn {
  background: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  cursor: pointer;
}

.overlay-btn svg {
  fill: var(--text-color);
}

.overlay-btn:active {
  background-color: var(--text-color);
  color: var(--bg-color);
}
.overlay-btn:active svg {
  fill: var(--bg-color);
}

.book-title-display {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 14px;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 50%;
}

.chapter-title-display {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.font-bold {
  font-weight: 700;
}

/* Progress Bar and Slider controls */
.progress-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
}

.progress-section input[type="range"] {
  flex-grow: 1;
  height: 8px;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  appearance: none;
  outline: none;
}

/* Style the range thumb (slider handle) for high-contrast e-ink visibility */
.progress-section input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  background: var(--text-color);
  cursor: pointer;
}

.progress-section input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  background: var(--text-color);
  cursor: pointer;
}

#reader-progress-percent {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 14px;
  min-width: 35px;
}

/* Settings adjustment bar inside reading bottom overlay */
.reader-settings-panel {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 6px;
  width: 100%;
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
}

@media (min-width: 768px) {
  .reader-settings-panel {
    flex-wrap: nowrap;
    align-items: center;
  }
}

.setting-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.setting-label {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14px;
  width: 65px;
}

.setting-value {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  min-width: 45px;
  text-align: center;
}

/* No margin required due to flex spacing */
.theme-group {
}

/* Table of Contents Overlay */
.toc-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: flex-end;
  z-index: 210;
}

body.theme-dark .toc-overlay {
  background-color: rgba(255, 255, 255, 0.2);
}

.toc-container {
  width: 80%;
  max-width: 320px;
  height: 100%;
  background-color: var(--bg-color);
  border-left: 2px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.toc-header {
  padding: 16px 20px;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.toc-header h2 {
  font-size: 18px;
  font-family: var(--font-sans);
}

.toc-list {
  flex: 1;
  overflow-y: auto;
  list-style: none;
}

.toc-item {
  border-bottom: 1px solid var(--border-color);
}

.toc-link {
  display: block;
  padding: 16px 20px;
  color: var(--text-color);
  text-decoration: none;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
}

.toc-link:active {
  background-color: var(--text-color);
  color: var(--bg-color);
}

/* Style injected into ePUB content iframe (needs to match theme exactly) */
.epub-rendered-content {
  transition: none !important;
  animation: none !important;
}

/* Floating Text Selection Context Menu (E-Ink Optimized) */
.selection-menu {
  position: absolute;
  bottom: 140px; /* Suspended above bottom bar overlays */
  left: 50%;
  transform: translateX(-50%);
  width: 92%;
  max-width: 520px;
  background-color: var(--overlay-bg);
  border: 3px solid var(--overlay-border);
  z-index: 180;
  padding: 12px;
}

.selection-menu-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.selection-menu-header h3 {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-color);
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 6px;
}

.selection-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.selection-actions .btn {
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 600;
  flex-grow: 1;
  text-align: center;
}

.selection-actions .btn-close {
  background-color: var(--text-color);
  color: var(--bg-color);
}
.selection-actions .btn-close:active {
  background-color: var(--bg-color);
  color: var(--text-color);
}

/* Catalog Search and Tab Navigation styling (E-Ink Optimized) */
.catalog-controls {
  padding: 12px 20px;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 12px;
  background-color: var(--bg-color);
}

.search-wrapper input {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  font-size: 16px;
  outline: none;
}

.tabs-wrapper {
  display: flex;
  width: 100%;
  gap: 6px;
}

.tab-btn {
  flex: 1;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 14px;
  background-color: var(--bg-color);
  color: var(--text-color);
  border: 2px solid var(--border-color);
  padding: 10px 6px;
  cursor: pointer;
  text-align: center;
}

.tab-btn.active {
  background-color: var(--text-color);
  color: var(--bg-color);
}

/* Accordion Groupings (Authors & Genres lists) */
.group-header {
  width: 100%;
  padding: 16px;
  border: 2px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16px;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.group-header:active {
  background-color: var(--text-color);
  color: var(--bg-color);
}

.group-books-container {
  padding: 8px 0 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Statistics View Styling */
.stats-view {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.stats-period-selector {
  border: 2px solid var(--border-color);
  padding: 16px;
  background-color: var(--bg-color);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

@media (min-width: 600px) {
  .stats-period-selector {
    flex-direction: row;
    align-items: center;
    gap: 15px;
  }
}

.select-outline {
  padding: 10px;
  border: 2px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 14px;
}

.custom-dates {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.input-outline {
  padding: 8px;
  border: 2px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  font-size: 14px;
}

/* Stats grids */
.stats-summary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 480px) {
  .stats-summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 700px) {
  .stats-summary-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.stat-card {
  border: 2px solid var(--border-color);
  padding: 20px;
  background-color: var(--bg-color);
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.stat-num {
  font-size: 32px;
  font-weight: 700;
  font-family: var(--font-sans);
  line-height: 1.1;
}

.stat-desc {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.8;
}

.stats-detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .stats-detail-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stats-section {
  border: 2px solid var(--border-color);
  padding: 16px;
  background-color: var(--bg-color);
}

.stats-section h3 {
  font-size: 16px;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 8px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stats-ranking-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stats-ranking-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border-color);
  font-size: 14px;
  font-weight: 600;
}

.stats-ranking-list li:last-child {
  border-bottom: none;
}

.stat-value-badge {
  border: 1px solid var(--border-color);
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 700;
}

/* Stats Share area */
.stats-share-container {
  border: 2px dashed var(--border-color);
  padding: 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.stats-share-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  width: 100%;
}

.stats-share-options .btn {
  flex-grow: 1;
  max-width: 120px;
  font-size: 13px;
  padding: 8px;
}