/* Lumina Web Novel Reader - CSS Stylesheet */

/* --- Custom Properties & Theme Tokens --- */
:root {
  --font-ui: 'Outfit', 'Inter', -apple-system, sans-serif;
  --font-content-sans: 'Inter', -apple-system, sans-serif;
  --font-content-serif: 'Georgia', serif;
  --font-content-literary: 'Playfair Display', Georgia, serif;
  --font-content-monospace: 'Courier New', Courier, monospace;

  /* Theme-specific tokens (Light theme values as fallback) */
  --bg-app: #f8fafc;
  --bg-sidebar: #ffffff;
  --bg-card: #f1f5f9;
  --border-color: #e2e8f0;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  --text-chinese: #8b5cf6; /* Indigo accent for bilingual matches */
  
  --accent-color: #6366f1; /* Indigo */
  --accent-hover: #4f46e5;
  --accent-light: #e0e7ff;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  
  --sidebar-width: 320px;
  
  /* Reading Config defaults */
  --reading-font-size: 18px;
  --reading-line-height: 1.8;
  --reading-max-width: 750px;
}

/* --- Dark Theme --- */
body.theme-dark {
  --bg-app: #0f172a;
  --bg-sidebar: #1e293b;
  --bg-card: #0f172a;
  --border-color: #334155;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;
  --text-chinese: #a78bfa; /* Violet accent */
  
  --accent-color: #818cf8; /* Indigo 400 */
  --accent-hover: #6366f1;
  --accent-light: rgba(129, 140, 248, 0.15);
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.5);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
}

/* --- Sepia Theme (Cozy, Warm Paper) --- */
body.theme-sepia {
  --bg-app: #fcf6e8;
  --bg-sidebar: #f5edd6;
  --bg-card: #fcf6e8;
  --border-color: #e6d9b8;
  
  --text-main: #433422;
  --text-muted: #7e6955;
  --text-inverse: #fcf6e8;
  --text-chinese: #b45309; /* Amber/Brown accent */
  
  --accent-color: #c2410c; /* Rust Orange */
  --accent-hover: #9a3412;
  --accent-light: #ffedd5;
  
  --shadow-sm: 0 1px 2px 0 rgb(67 52 34 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(67 52 34 / 0.08);
  --shadow-lg: 0 10px 15px -3px rgb(67 52 34 / 0.1);
}

/* --- Mint Theme (Cozy Green) --- */
body.theme-mint {
  --bg-app: #f0f7f4;
  --bg-sidebar: #e1ede8;
  --bg-card: #f0f7f4;
  --border-color: #ccdcd4;
  
  --text-main: #1b3b2b;
  --text-muted: #526f60;
  --text-inverse: #f0f7f4;
  --text-chinese: #059669; /* Emerald accent */
  
  --accent-color: #0d9488; /* Teal */
  --accent-hover: #0f766e;
  --accent-light: #ccfbf1;
  
  --shadow-sm: 0 1px 2px 0 rgb(27 59 43 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(27 59 43 / 0.08);
  --shadow-lg: 0 10px 15px -3px rgb(27 59 43 / 0.1);
}

/* --- Reset & Core Layout --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-ui);
  color: var(--text-main);
  background-color: var(--bg-app);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.app-container {
  display: flex;
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

/* --- Collapsible Sidebar --- */
.app-sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100%;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), background-color var(--transition-normal);
  z-index: 100;
}

/* When sidebar is closed */
.app-sidebar.collapsed {
  transform: translateX(-100%);
  position: absolute;
}

.sidebar-header {
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  font-size: 28px;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.logo-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 2px;
}

.sidebar-close-btn {
  background: transparent;
  border: none;
  font-size: 28px;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
  display: none; /* Only visible on smaller screens */
  line-height: 1;
}

.sidebar-close-btn:hover {
  color: var(--text-main);
}

/* --- Search Box --- */
.sidebar-search-box {
  padding: 16px 24px 8px;
  position: relative;
}

.sidebar-search-box input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-main);
  font-family: var(--font-content-sans);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.sidebar-search-box input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.sidebar-search-box .search-icon {
  position: absolute;
  left: 38px;
  top: 28px;
  font-size: 16px;
  color: var(--text-muted);
  pointer-events: none;
}

/* --- Progress Section --- */
.sidebar-progress {
  padding: 8px 24px 16px;
  border-bottom: 1px solid var(--border-color);
}

.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 6px;
}

.progress-label {
  color: var(--text-muted);
}

.progress-val {
  color: var(--accent-color);
}

.progress-bar-container {
  width: 100%;
  height: 6px;
  background-color: var(--bg-card);
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar-fill {
  width: 0%;
  height: 100%;
  background-color: var(--accent-color);
  border-radius: 10px;
  transition: width 0.3s ease;
}

/* --- Chapter List --- */
.chapter-list-container {
  flex: 1;
  overflow-y: auto;
  padding: 16px 24px;
}

.chapter-list-header {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 600;
  margin-bottom: 12px;
}

.chapter-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chapter-item {
  width: 100%;
}

.chapter-link {
  display: flex;
  flex-direction: column;
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-left var(--transition-fast);
  border-left: 3px solid transparent;
  text-decoration: none;
}

.chapter-link:hover {
  background-color: var(--bg-card);
}

.chapter-link.active {
  background-color: var(--accent-light);
  border-left-color: var(--accent-color);
}

.chapter-link.active .chapter-item-title-en {
  color: var(--accent-color);
  font-weight: 600;
}

.chapter-item-title-en {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 2px;
  transition: color var(--transition-fast);
}

.chapter-item-title-zh {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --- Sidebar Footer --- */
.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-card);
}

.footer-stat {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  margin-bottom: 6px;
}

.footer-stat:last-child {
  margin-bottom: 0;
}

.footer-stat span {
  color: var(--text-muted);
}

.footer-stat strong {
  color: var(--text-main);
}

/* --- Reader Main Panel --- */
.reader-main {
  flex: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* --- Reader Header Bar --- */
.reader-header {
  height: 70px;
  min-height: 70px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  background-color: var(--bg-sidebar);
  z-index: 90;
  transition: background-color var(--transition-normal);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
  overflow: hidden;
  flex: 1;
}

.menu-toggle-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  width: 24px;
  height: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: opacity var(--transition-fast);
}

.menu-toggle-btn span {
  display: block;
  height: 2.5px;
  width: 100%;
  background-color: var(--text-main);
  border-radius: 4px;
  transition: background-color var(--transition-fast);
}

.menu-toggle-btn:hover {
  opacity: 0.7;
}

.header-chapter-title {
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 450px;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* --- Dropdown Menus --- */
.control-group {
  position: relative;
}

.control-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 14px;
  border-radius: 6px;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 6px;
}

.control-btn:hover {
  background-color: var(--border-color);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background-color: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  padding: 8px;
  min-width: 180px;
  display: none;
  flex-direction: column;
  gap: 4px;
  z-index: 200;
  animation: slideDown 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.dropdown-menu.show {
  display: flex;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Theme Dropdown specific */
.theme-menu {
  min-width: 140px;
}

.theme-opt {
  width: 100%;
  padding: 10px 12px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--text-main);
  text-align: left;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: background-color var(--transition-fast);
}

.theme-opt::before {
  content: '';
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--theme-color);
  border: 1px solid rgba(0,0,0,0.15);
}

.theme-opt:hover {
  background-color: var(--bg-card);
}

.theme-opt.active {
  background-color: var(--accent-light);
  color: var(--accent-color);
}

/* Mode Options */
.mode-opt {
  width: 100%;
  padding: 10px 12px;
  border: none;
  background: transparent;
  color: var(--text-main);
  text-align: left;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.mode-opt:hover {
  background-color: var(--bg-card);
}

.mode-opt.active {
  background-color: var(--accent-light);
  color: var(--accent-color);
}

/* Settings Panel specific */
.settings-panel {
  min-width: 280px;
  padding: 16px;
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.setting-item:last-child {
  margin-bottom: 0;
}

.setting-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}

.btn-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.setting-action-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.setting-action-btn:hover {
  background-color: var(--border-color);
}

.setting-action-btn.wide-btn {
  width: auto;
  padding: 0 16px;
}

.setting-value {
  font-size: 13px;
  font-weight: 600;
  min-width: 50px;
  text-align: center;
}

.setting-select {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: 6px;
  font-family: var(--font-ui);
  font-size: 13px;
  outline: none;
  cursor: pointer;
  width: 140px;
}

.speed-select {
  width: 80px;
}

/* --- Reader Viewport / Canvas --- */
.reader-viewport {
  flex: 1;
  overflow-y: auto;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 24px;
}

.reader-content-container {
  width: 100%;
  max-width: var(--reading-max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  min-height: 60vh;
  transition: max-width var(--transition-normal);
}

/* --- Typography of Novel text --- */
.reader-content-container h2 {
  font-family: var(--font-ui);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1.5rem;
  letter-spacing: -0.5px;
}

.reader-content-container h3.zh-title {
  font-family: var(--font-ui);
  font-size: 1.25rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 2.5rem;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 1rem;
}

/* Novel Paragraph Blocks */
.novel-paragraph {
  font-size: var(--reading-font-size);
  line-height: var(--reading-line-height);
  margin-bottom: 1.8rem;
  text-align: justify;
}

/* Serif font style default */
.font-serif {
  font-family: var(--font-content-serif);
}
.font-sans-serif {
  font-family: var(--font-content-sans);
}
.font-literary {
  font-family: var(--font-content-literary);
}
.font-monospace {
  font-family: var(--font-content-monospace);
}

/* Interactive Bilingual Click-to-Reveal styling */
.interactive-para {
  cursor: pointer;
  position: relative;
  padding: 4px 8px;
  margin-left: -8px;
  margin-right: -8px;
  border-radius: 6px;
  transition: background-color var(--transition-fast);
}

.interactive-para:hover {
  background-color: var(--bg-card);
}

.interactive-para::after {
  content: "👁️ Click to see Chinese";
  position: absolute;
  right: 8px;
  bottom: -16px;
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  color: var(--accent-color);
  opacity: 0;
  transition: opacity var(--transition-fast);
  pointer-events: none;
}

.interactive-para:hover::after {
  opacity: 0.7;
}

.source-zh-box {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
  font-size: 0.9em;
  color: var(--text-chinese);
  background-color: var(--accent-light);
  border-radius: 4px;
  padding: 0 12px;
  margin-top: 4px;
  line-height: 1.6;
}

.interactive-para.active .source-zh-box {
  max-height: 500px;
  padding: 10px 12px;
  margin-bottom: 12px;
}

.interactive-para.active::after {
  content: "🙈 Click to hide Chinese";
}

/* Bilingual Alternating view */
.bilingual-para-pair {
  margin-bottom: 2.2rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.bilingual-para-en {
  font-size: var(--reading-font-size);
  line-height: var(--reading-line-height);
  color: var(--text-main);
}

.bilingual-para-zh {
  font-size: calc(var(--reading-font-size) - 2px);
  line-height: 1.6;
  color: var(--text-muted);
  border-left: 2px solid var(--accent-color);
  padding-left: 10px;
  font-style: italic;
}

/* --- Container Width classes --- */
.width-narrow {
  --reading-max-width: 600px;
}
.width-medium {
  --reading-max-width: 750px;
}
.width-wide {
  --reading-max-width: 900px;
}

/* --- Loading States & Errors --- */
.initial-loading-message {
  text-align: center;
  padding: 80px 24px;
  color: var(--text-muted);
}

.loader-spinner {
  font-size: 48px;
  display: inline-block;
  margin-bottom: 16px;
  animation: spin 2s linear infinite;
}

@keyframes spin {
  100% {
    transform: rotate(360deg);
  }
}

.initial-loading-message h2 {
  font-size: 24px;
  color: var(--text-main);
  margin-bottom: 8px;
}

/* --- Bottom Chapter Navigation --- */
.reader-navigation {
  border-top: 1px solid var(--border-color);
  height: 80px;
  min-height: 80px;
  display: flex;
  background-color: var(--bg-sidebar);
  transition: background-color var(--transition-normal);
  z-index: 90;
}

.nav-arrow-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--text-main);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  text-decoration: none;
}

.nav-arrow-btn:hover {
  background-color: var(--bg-card);
}

.nav-arrow-btn:first-child {
  border-right: 1px solid var(--border-color);
}

.arrow-icon {
  font-size: 20px;
  font-weight: bold;
  transition: transform var(--transition-fast);
}

.nav-arrow-btn:hover:first-child .arrow-icon {
  transform: translateX(-4px);
}

.nav-arrow-btn:hover:last-child .arrow-icon {
  transform: translateX(4px);
}

.nav-text-container {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  max-width: 300px;
  overflow: hidden;
}

.nav-arrow-btn:last-child .nav-text-container {
  align-items: flex-end;
  text-align: right;
}

.nav-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.nav-chapter-name {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}

/* --- Quick Scroll to Top button --- */
.scroll-top-btn {
  position: absolute;
  right: 30px;
  bottom: 100px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--accent-color);
  color: var(--text-inverse);
  border: none;
  font-size: 20px;
  font-weight: bold;
  cursor: pointer;
  display: none; /* Controlled by JS scroll events */
  justify-content: center;
  align-items: center;
  box-shadow: var(--shadow-lg);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  z-index: 120;
}

.scroll-top-btn:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
}

.scroll-top-btn:active {
  transform: translateY(0);
}

/* --- Scrollbar customizations --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* --- Responsive Layout Adjustments --- */
@media (max-width: 900px) {
  .app-sidebar {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    transform: translateX(0);
  }
  
  .app-sidebar.collapsed {
    transform: translateX(-100%);
  }
  
  .sidebar-close-btn {
    display: block;
  }
}

@media (max-width: 600px) {
  .header-chapter-title {
    max-width: 150px;
    font-size: 14px;
  }
  
  .control-btn {
    padding: 6px 10px;
    font-size: 11px;
  }
  
  .nav-chapter-name {
    max-width: 100px;
  }
}

/* --- Pending/Translating Chapter Styling --- */
.chapter-link.pending {
  opacity: 0.55;
}

.chapter-link.pending .chapter-item-title-en {
  color: var(--text-muted);
  font-style: italic;
}

.chapter-link.pending:hover {
  opacity: 0.9;
  background-color: var(--bg-card);
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 0.8;
  }
  50% {
    transform: scale(1.08);
    opacity: 1;
  }
  100% {
    transform: scale(1);
    opacity: 0.8;
  }
}