@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400&family=Noto+Serif+KR:wght@300;400;600;700&display=swap');

/* CSS Variables for Themes */
:root {
  /* Common Light Mode */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --accent-color: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.15);
  
  /* Highlights colors */
  --hl-yellow: rgba(253, 224, 71, 0.4);
  --hl-green: rgba(134, 239, 172, 0.4);
  --hl-pink: rgba(244, 114, 182, 0.4);
  --hl-blue: rgba(147, 197, 253, 0.4);
  
  /* Font Families */
  --font-sans: 'Inter', sans-serif;
  --font-serif: 'Playfair Display', 'Noto Serif KR', serif;
  
  /* Shadows & Glass */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  
  /* Layout */
  --sidebar-width: 280px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Theme overrides */
[data-theme="dark"] {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #6b7280;
  --border-color: #374151;
  --accent-color: #818cf8;
  --accent-glow: rgba(129, 140, 248, 0.25);
  
  --hl-yellow: rgba(234, 179, 8, 0.45);
  --hl-green: rgba(34, 197, 94, 0.45);
  --hl-pink: rgba(236, 72, 153, 0.45);
  --hl-blue: rgba(59, 130, 246, 0.45);
  
  --glass-bg: rgba(17, 24, 39, 0.75);
  --glass-border: rgba(55, 65, 81, 0.5);
}

[data-theme="sepia"] {
  --bg-primary: #f4ecd8;
  --bg-secondary: #fdf6e3;
  --bg-tertiary: #ebdcb9;
  --text-primary: #5c4636;
  --text-secondary: #6e5847;
  --text-muted: #a18e7d;
  --border-color: #e4d4b2;
  --accent-color: #b58900;
  --accent-glow: rgba(181, 137, 0, 0.15);
  
  --hl-yellow: rgba(234, 179, 8, 0.35);
  --hl-green: rgba(34, 197, 94, 0.35);
  --hl-pink: rgba(236, 72, 153, 0.35);
  --hl-blue: rgba(59, 130, 246, 0.35);
  
  --glass-bg: rgba(253, 246, 227, 0.8);
  --glass-border: rgba(228, 212, 178, 0.6);
}

/* Global Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
}

/* Typography elements */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 600;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  opacity: 0.85;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  transition: all var(--transition-fast);
}

/* Utility Layouts */
.glass-container {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-lg);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Top Navigation Bar */
.top-navbar {
  height: 70px;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-accent {
  color: var(--accent-color);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* Theme Switcher and Profile Dropdown */
.theme-btn-group {
  display: flex;
  background: var(--bg-tertiary);
  padding: 3px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
}

.theme-opt-btn {
  padding: 0.35rem 0.85rem;
  border-radius: 17px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.theme-opt-btn.active {
  background: var(--bg-secondary);
  color: var(--accent-color);
  box-shadow: var(--shadow-sm);
}

.profile-chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--accent-glow);
  border: 1px solid var(--accent-color);
  border-radius: 20px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
}

.profile-chip .avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: bold;
}

/* 1. Profile Selection Dashboard (index.html) */
.entrance-wrapper {
  max-width: 1100px;
  margin: 3rem auto;
  padding: 0 1.5rem;
  text-align: center;
}

.entrance-header {
  margin-bottom: 3.5rem;
  animation: fadeIn 0.8s ease;
}

.entrance-header h1 {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  margin-bottom: 0.75rem;
  letter-spacing: -0.5px;
}

.entrance-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.grid-20-seats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-bottom: 4rem;
  animation: slideUp 0.8s ease;
}

.seat-card {
  padding: 2rem 1.25rem;
  border-radius: 16px;
  text-align: center;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.seat-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-color);
  box-shadow: 0 12px 20px -8px var(--accent-glow);
}

.seat-card.active-seat {
  border-color: var(--accent-color);
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--accent-glow) 100%);
}

.seat-number {
  position: absolute;
  top: 10px;
  right: 12px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.seat-avatar {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 1rem;
  transition: all var(--transition-normal);
  border: 1px solid var(--border-color);
}

.seat-card:hover .seat-avatar,
.seat-card.active-seat .seat-avatar {
  background: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
}

.seat-name {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.seat-status {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.seat-card.active-seat .seat-status {
  color: var(--accent-color);
  font-weight: 500;
}

/* Modal Styling */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-secondary);
  padding: 2.5rem;
  border-radius: 20px;
  width: 100%;
  max-width: 420px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.open .modal-box {
  transform: translateY(0);
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-color);
}

.modal-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.btn {
  flex: 1;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 550;
  text-align: center;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--accent-color);
  color: white;
}

.btn-primary:hover {
  opacity: 0.9;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

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

/* 2. Library Page (library.html) */
.library-wrapper {
  max-width: 1200px;
  margin: 2.5rem auto;
  padding: 0 1.5rem;
}

.library-section {
  margin-bottom: 4rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title::after {
  content: '';
  flex-grow: 1;
  height: 1px;
  background: var(--border-color);
  margin-left: 1rem;
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.book-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  cursor: pointer;
}

.book-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-color);
}

.book-cover-mock {
  height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.5rem;
  color: white;
  position: relative;
}

.book-cover-genre {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(4px);
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  align-self: flex-start;
  font-weight: 500;
}

.book-cover-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.25rem;
}

.book-cover-author {
  font-size: 0.85rem;
  opacity: 0.85;
}

.book-card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.book-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-progress-bar {
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.book-progress-fill {
  height: 100%;
  background: var(--accent-color);
  width: 0%;
  transition: width var(--transition-normal);
}

.book-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Dashboard of saved user elements in Library */
.user-activity-dashboard {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.75rem;
  margin-bottom: 3rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-glow);
  color: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.stat-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-content p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 3. Book Reader Page (reader.html) */
.reader-container {
  display: flex;
  height: calc(100vh - 70px);
  overflow: hidden;
  position: relative;
}

/* Reader Sidebar Navigation */
.reader-sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
  z-index: 90;
}

.sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-tertiary);
}

.tab-btn {
  flex: 1;
  padding: 0.9rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 550;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
}

.tab-btn.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
  background: var(--bg-secondary);
}

.sidebar-content {
  flex-grow: 1;
  overflow-y: auto;
  padding: 1.25rem;
}

.chapter-list {
  list-style: none;
}

.chapter-item {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.chapter-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.chapter-item.active {
  background: var(--accent-glow);
  color: var(--accent-color);
  font-weight: 600;
}

/* Saved annotations elements list in Reader Sidebar */
.annotation-list-item {
  padding: 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.annotation-list-item:hover {
  border-color: var(--accent-color);
  box-shadow: var(--shadow-sm);
}

.ann-item-type {
  font-size: 0.7rem;
  text-transform: uppercase;
  font-weight: bold;
  margin-bottom: 0.35rem;
  display: inline-block;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}

.ann-item-quote {
  font-style: italic;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.35rem;
}

.ann-item-memo {
  font-weight: 500;
  color: var(--text-primary);
  border-left: 2px solid var(--accent-color);
  padding-left: 0.5rem;
}

/* Main Reader Viewport */
.reader-viewport {
  flex-grow: 1;
  overflow-y: auto;
  padding: 3rem 1.5rem;
  display: flex;
  justify-content: center;
  position: relative;
}

.reader-content-box {
  width: 100%;
  max-width: 680px;
}

.reader-book-header {
  margin-bottom: 3rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 1.5rem;
}

.reader-book-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.reader-chapter-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Bookmark (책갈피) flag */
.bookmark-ribbon {
  position: fixed;
  top: 70px;
  right: 40px;
  width: 32px;
  height: 48px;
  background: var(--text-muted);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 80%, 0 100%);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 95;
  display: flex;
  justify-content: center;
  padding-top: 6px;
  color: white;
  font-size: 0.85rem;
}

.bookmark-ribbon.active {
  background: #f43f5e;
  transform: translateY(5px);
  box-shadow: 0 4px 10px rgba(244, 63, 94, 0.3);
}

.bookmark-ribbon:hover {
  transform: translateY(2px);
}

/* The actual reading text style - clean, spaced, serif */
.reading-area {
  font-family: var(--font-serif);
  font-size: 1.18rem;
  line-height: 2.0;
  color: var(--text-primary);
  text-align: justify;
}

.reading-area p {
  margin-bottom: 2.2rem;
  position: relative;
  transition: background-color var(--transition-fast);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Highlighter spans inside paragraph */
.hl-span {
  border-radius: 2px;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.hl-span:hover {
  opacity: 0.85;
}

.hl-span.hl-yellow { background-color: var(--hl-yellow); }
.hl-span.hl-green { background-color: var(--hl-green); }
.hl-span.hl-pink { background-color: var(--hl-pink); }
.hl-span.hl-blue { background-color: var(--hl-blue); }

.hl-span.hl-underline {
  border-bottom: 2px solid var(--accent-color);
  background: none;
}

.hl-span.has-memo::after {
  content: '📝';
  font-size: 0.75rem;
  vertical-align: super;
  margin-left: 2px;
}

/* Text Selection Highlighter Menu (Popup Context Menu) */
.highlighter-menu {
  position: absolute;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 0.4rem 0.8rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 500;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -100%) translateY(-10px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.highlighter-menu.show {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -100%) translateY(-5px);
}

.hl-menu-btn {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid transparent;
  transition: transform var(--transition-fast);
}

.hl-menu-btn:hover {
  transform: scale(1.15);
}

.hl-menu-btn.btn-yellow { background-color: #fde047; }
.hl-menu-btn.btn-green { background-color: #86efac; }
.hl-menu-btn.btn-pink { background-color: #f472b6; }
.hl-menu-btn.btn-blue { background-color: #93c5fd; }

.hl-menu-btn.btn-underline {
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text-primary);
  border-color: var(--border-color);
}

.hl-menu-divider {
  width: 1px;
  height: 18px;
  background: var(--border-color);
}

.hl-menu-btn.btn-memo {
  background: transparent;
  border-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.hl-menu-btn.btn-remove {
  background: transparent;
  border-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ef4444;
  font-size: 0.95rem;
}

/* Sidebar Toggle for Reader Settings and Navigation */
.reader-footer-toolbar {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  padding: 0.6rem 1.5rem;
  border-radius: 30px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  box-shadow: var(--shadow-lg);
  z-index: 95;
}

.toolbar-btn {
  font-size: 0.9rem;
  font-weight: 550;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
}

.toolbar-btn:hover {
  color: var(--accent-color);
}

/* Settings Box */
.settings-menu {
  position: absolute;
  bottom: calc(100% + 12px);
  right: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.25rem;
  width: 250px;
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  gap: 1rem;
}

.settings-menu.open {
  display: flex;
}

.settings-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.settings-row span {
  font-size: 0.85rem;
  font-weight: 500;
}

.font-size-adjust {
  display: flex;
  gap: 0.5rem;
}

.font-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: bold;
  color: var(--text-primary);
}

.font-btn:hover {
  border-color: var(--accent-color);
}

/* Reader Memo Input Dialog */
.memo-dialog-box {
  max-width: 360px;
}

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

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .reader-sidebar {
    position: fixed;
    left: 0;
    top: 70px;
    bottom: 0;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }
  
  .reader-sidebar.open {
    transform: translateX(0);
  }
  
  .top-navbar {
    padding: 0 1rem;
  }
  
  .nav-actions {
    gap: 0.75rem;
  }
  
  .theme-btn-group {
    display: none; /* Hide theme selector in navbar on mobile, keep in footer settings */
  }
}

/* ==========================================================================
   4. Author Studio / 집필실 (author.html) Stylings
   ========================================================================== */
.author-container {
  display: flex;
  height: calc(100vh - 70px);
  overflow: hidden;
}

.author-sidebar {
  width: 320px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  gap: 1.5rem;
}

.author-book-list {
  flex-grow: 1;
  overflow-y: auto;
  list-style: none;
}

.author-book-item {
  padding: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--bg-primary);
}

.author-book-item:hover, .author-book-item.active {
  border-color: var(--accent-color);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-sm);
}

.author-book-item.active {
  border-width: 2px;
  background: var(--accent-glow);
}

.book-item-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.25rem;
}

.badge-static {
  font-size: 0.7rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-custom {
  font-size: 0.7rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--accent-glow);
  color: var(--accent-color);
  font-weight: 600;
}

.author-workspace {
  flex-grow: 1;
  padding: 2.5rem;
  overflow-y: auto;
  background: var(--bg-primary);
  display: flex;
  justify-content: center;
}

.workspace-inner {
  width: 100%;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.workspace-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 80%;
  color: var(--text-muted);
  text-align: center;
}

.workspace-placeholder .icon {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  opacity: 0.7;
}

.studio-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.studio-card-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.studio-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.gradient-presets {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.gradient-preset-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
}

.gradient-preset-btn.active {
  border-color: var(--text-primary);
  transform: scale(1.1);
}

/* Chapter Editor layout in Author Studio */
.author-chapter-tabs {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.author-chapter-tab {
  padding: 0.5rem 1rem;
  border-radius: 8px 8px 0 0;
  border: 1px solid var(--border-color);
  border-bottom: none;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.author-chapter-tab.active {
  background: var(--bg-secondary);
  color: var(--accent-color);
  font-weight: 600;
  border-color: var(--border-color);
  border-top-color: var(--accent-color);
  border-top-width: 2px;
}

.textarea-editor {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.8;
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  width: 100%;
  resize: vertical;
  min-height: 250px;
}

.textarea-editor:focus {
  outline: none;
  border-color: var(--accent-color);
  background: var(--bg-secondary);
}

.editor-info-note {
  margin-top: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* ==========================================================================
   5. Admin Console / 관리자 페이지 (admin.html) Stylings
   ========================================================================== */
.admin-login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 120px);
}

.admin-wrapper {
  max-width: 1200px;
  margin: 2.5rem auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.admin-table-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.admin-table th, .admin-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.admin-table th {
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
}

.admin-table tr:hover {
  background: var(--bg-primary);
}

/* Switch component toggle */
.switch {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--text-muted);
  transition: .3s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--accent-color);
}

input:checked + .slider:before {
  transform: translateX(22px);
}

.input-passcode {
  width: 90px;
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.85rem;
  text-align: center;
}

.input-passcode:focus {
  outline: none;
  border-color: var(--accent-color);
}

.badge-vacant {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  font-weight: 500;
}

.badge-active-user {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: var(--accent-glow);
  color: var(--accent-color);
  font-weight: 600;
}