/* ================================================================
   pwa-style.css — PWA Ebook Reader styles
   Dark library shell + configurable reader themes + all features
   ================================================================ */

/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --lib-bg:           #13132b;
  --lib-header-bg:    #1a1a38;
  --lib-header-border:#242452;
  --card-bg:          #1e1e3c;
  --card-hover-bg:    #252550;
  --card-border:      #2d2d5a;
  --primary:          #4a7eff;
  --primary-hover:    #5a8fff;
  --primary-text:     #ffffff;
  --text:             #d0d0e0;
  --text-muted:       #7878a0;
  --panel-bg:         #1a1a38;
  --panel-border:     #2a2a52;
  --toolbar-bg:       #191930;
  --toolbar-border:   #26264e;
  --modal-overlay:    rgba(0,0,0,0.72);
  --toast-bg:         rgba(25,25,48,0.96);
  --radius:           10px;
  --radius-sm:        6px;
}

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--lib-bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

/* ── Views ────────────────────────────────────────────────── */
.view { display: none; position: fixed; inset: 0; flex-direction: column; background: var(--lib-bg); }
.view.active { display: flex; }

/* ── Buttons ──────────────────────────────────────────────── */
.pwa-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 16px; border: none; border-radius: var(--radius-sm); cursor: pointer;
  font-size: 14px; font-weight: 500; background: var(--card-bg); color: var(--text);
  transition: background 0.15s, opacity 0.15s; white-space: nowrap;
}
.pwa-btn:hover { background: var(--card-hover-bg); }
.pwa-btn-primary { background: var(--primary); color: var(--primary-text); }
.pwa-btn-primary:hover { background: var(--primary-hover); }
.pwa-btn-danger { background: rgba(148,163,184,0.25); color: var(--text-muted); }
.pwa-btn-danger:hover { background: rgba(148,163,184,0.4); }
.pwa-btn-sm { padding: 5px 10px; font-size: 13px; }
.pwa-btn .material-symbols-outlined { font-size: 18px; }

.tb-btn {
  background: none; border: none; cursor: pointer; padding: 6px;
  border-radius: var(--radius-sm); color: var(--text-muted);
  line-height: 1; transition: background 0.15s, color 0.15s;
  display: inline-flex; align-items: center; justify-content: center;
}
.tb-btn:hover { background: rgba(255,255,255,0.08); color: var(--text); }
.tb-btn.active { color: var(--primary); }
.tb-btn:disabled { opacity: 0.4; cursor: default; }
.tb-btn:disabled:hover { background: none; color: var(--text-muted); }
.tb-btn .material-symbols-outlined { font-size: 22px; }

.ai-grounding-dropdown { position: relative; display: inline-flex; }
.ai-grounding-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface, #1e293b);
  border: 1px solid var(--panel-border, rgba(148,163,184,0.2));
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(0,0,0,0.35);
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 4px;
  z-index: 999;
}
.ai-grounding-menu[hidden] { display: none; }
.ai-grounding-menu .tb-btn { width: 100%; justify-content: center; }
.ai-grounding-menu .tb-btn.active { color: var(--primary); background: rgba(96,165,250,0.1); }
.ai-grounding-chevron { font-size: 13px !important; margin-left: -3px; opacity: 0.75; font-variation-settings: 'wght' 700; }

/* ── Library header ───────────────────────────────────────── */
.lib-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px; background: var(--lib-header-bg);
  border-bottom: 1px solid var(--lib-header-border); flex-shrink: 0; gap: 12px;
}
.lib-header-left  { display: flex; align-items: center; gap: 12px; }
.lib-header-right { display: flex; align-items: center; gap: 8px; }
.lib-logo  { font-size: 26px; line-height: 1; }
.lib-title { font-size: 20px; font-weight: 600; color: var(--text); }

/* ── Library grid ─────────────────────────────────────────── */
.library-grid {
  flex: 1; overflow-y: auto; padding: 24px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 20px; align-content: start;
}

/* ── Book card ────────────────────────────────────────────── */
.book-card {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); overflow: hidden; cursor: pointer;
  display: flex; flex-direction: column; position: relative;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s; outline: none;
}
.book-card:hover, .book-card:focus-visible {
  transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,0.45);
  background: var(--card-hover-bg);
}
.book-card:focus-visible { box-shadow: 0 0 0 2px var(--primary), 0 8px 24px rgba(0,0,0,0.45); }

.book-cover-wrap {
  width: 100%; aspect-ratio: 2/3; overflow: hidden;
  background: linear-gradient(135deg, #1e2a4a 0%, #2a1e4a 100%); position: relative;
}
.book-cover-img { width: 100%; height: 100%; object-fit: cover; display: block; }
.book-cover-placeholder {
  width: 100%; height: 100%; display: flex; align-items: center;
  justify-content: center; font-size: 52px;
}
.book-info { padding: 10px 12px 4px; flex: 1; }
.book-title {
  font-size: 13px; font-weight: 600; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; display: -webkit-box;
  -webkit-line-clamp: 2; -webkit-box-orient: vertical; line-height: 1.3; margin-bottom: 3px;
}
.book-author { font-size: 11px; color: var(--text-muted); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }

.book-delete-btn {
  position: absolute; top: 6px; right: 6px; background: rgba(0,0,0,0.55);
  border: none; border-radius: 50%; width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 14px; opacity: 0; transition: opacity 0.15s, background 0.15s;
}
.book-card:hover .book-delete-btn { opacity: 0.8; }
.book-delete-btn:hover { opacity: 1 !important; background: rgba(180,40,40,0.75); }

/* ── Library empty/loading ────────────────────────────────── */
.lib-empty, .lib-loading, .lib-error {
  grid-column: 1 / -1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 64px 24px;
  color: var(--text-muted); text-align: center; gap: 12px; line-height: 1.5;
}
.empty-icon { font-size: 60px; line-height: 1; }
.empty-hint { font-size: 13px; }
.lib-error  { color: #d06060; }

/* ── Drop overlay ─────────────────────────────────────────── */
.drop-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(74, 126, 255, 0.14); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  border: 4px dashed var(--primary); pointer-events: none;
}
.drop-overlay.hidden { display: none; }
.drop-message { display: flex; flex-direction: column; align-items: center; gap: 14px; color: var(--primary); font-size: 22px; font-weight: 600; }
.drop-icon { font-size: 72px; line-height: 1; }

/* ── Reader toolbar ───────────────────────────────────────── */
.reader-toolbar {
  display: flex; align-items: center; gap: 4px; padding: 6px 10px;
  background: var(--toolbar-bg); border-bottom: none;
  flex-shrink: 0; z-index: 10;
}
.reader-title-area { flex: 1; min-width: 0; display: flex; flex-direction: column; align-items: stretch; justify-content: center; }
.reader-title-row { display: flex; align-items: center; gap: 10px; padding: 0 8px; }
.reader-book-title { font-size: 13px; font-weight: 500; color: var(--text); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.reader-progress-track {
  flex: 0 0 88px; width: 88px; min-width: 88px; height: 12px;
  border-radius: 999px; overflow: hidden;
  background: rgba(188, 216, 255, 0.16);
  border: 1px solid rgba(188, 216, 255, 0.28);
}
.reader-progress-fill {
  display: block; height: 100%; width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, #5a86c2 0%, #8fb6ea 100%);
  transition: width 0.2s ease;
}

/* ── Chapter sub-header (inside toolbar title area) ─────── */
.reader-chapter-header {
  display: none;
  padding: 1px 8px 3px 8px;
  font-size: 11px;
  font-style: italic;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0.65;
}
.reader-chapter-header.visible { display: block; }

/* ── Reader body ─────────────────────────────────────────── */
.reader-body-wrap {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
  padding-top: 15px;
  box-sizing: border-box;
}
.reader-main {
  flex: 1; display: flex; align-items: stretch; position: relative; overflow: hidden; height: 100%;
  --spread-divider-color: #e5e7eb;
  --spread-rule-color: rgba(17, 24, 39, 0.18);
  --reader-stage-bg: transparent;
  --reader-stage-glow: rgba(255, 248, 234, 0.55);
  --reader-paper-bg: #fffdf8;
  --reader-paper-frame: rgba(122, 92, 49, 0.12);
  --reader-paper-shadow: rgba(72, 50, 23, 0.22);
  --reader-edge-shadow: transparent;
  --reader-edge-highlight: rgba(255, 255, 255, 0.72);
  --reader-gutter-shadow: rgba(88, 61, 30, 0.18);
  --reader-page-stack-line: rgba(130, 101, 66, 0.18);
  --reader-page-stack-shadow: transparent;
  --single-page-sheet-width: min(820px, calc(100% - 92px));
  --single-page-stage-gap: clamp(24px, 5vw, 56px);
  --spread-gap-half: 10px;
  --spread-outer-margin: 10px;
  --spread-top-margin: 10px;
  --spread-bottom-margin: 88px;
  --viewer-bottom-gap: 15px;
  --viewer-left-offset: 0px;
  --viewer-right-offset: 0px;
  --viewer-mid-from-left: 50%;
  --viewer-mid-from-right: 50%;
  --viewer-bottom-offset: 15px;
  --page-number-bottom: 18px;
  --viewer-corner-radius: 4px;
  background: transparent;
}
.epub-viewer-shell {
  flex: 1;
  min-width: 0;
  min-height: 0;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-left: 15px;
  padding-right: 15px;
  padding-bottom: 15px;
  box-sizing: border-box;
}
#epub-viewer {
  flex: 1; overflow: hidden; background: var(--reader-paper-bg); height: 100%; min-height: 0; position: relative; border-radius: var(--viewer-corner-radius);
}

/* Std Layout mode: viewer keeps frozen pixel dimensions so pagination
   stays identical regardless of panel open/close or window resize.
   When the available space is smaller than the frozen size the viewer
   is scaled down (via CSS transform set from JS) so no text is cut off. */
.epub-viewer-shell.std-layout-shell {
  position: relative;
  overflow: hidden;
}
#epub-viewer.std-layout-fixed {
  position: absolute;
  top: 0;
  left: 50%;
  transform-origin: top center;
  max-width: none !important;
  max-height: none !important;
  /* width, height, and transform set via inline style from JS */
}

.reader-main:not(.two-page-mode) #epub-viewer {
  max-width: 660px;
  margin: 0 auto;
  flex: 1 1 auto;
  width: 100%;
}

.reader-main.two-page-mode #epub-viewer {
  flex: 1 1 auto;
  width: 100%;
  max-width: 1340px;
  margin: 0 auto;
}
.reader-main.single-page-left #epub-viewer {
  margin-left: 0;
  margin-right: 0;
}

.reader-main.single-page-right #epub-viewer {
  margin-left: 0;
  margin-right: 0;
}

#epub-viewer::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background:
    linear-gradient(90deg,
      var(--reader-page-stack-line) 0px 1px,
      transparent 1px 4px,
      var(--reader-page-stack-line) 4px 5px,
      transparent 5px 8px,
      var(--reader-page-stack-line) 8px 9px,
      transparent 9px calc(100% - 9px),
      var(--reader-page-stack-line) calc(100% - 9px) calc(100% - 8px),
      transparent calc(100% - 8px) calc(100% - 5px),
      var(--reader-page-stack-line) calc(100% - 5px) calc(100% - 4px),
      transparent calc(100% - 4px) calc(100% - 1px),
      var(--reader-page-stack-line) calc(100% - 1px) 100%);
}

.reader-main.single-page-left #epub-viewer::before {
  background:
    linear-gradient(90deg,
      var(--reader-page-stack-line) 0px 1px,
      transparent 1px 4px,
      var(--reader-page-stack-line) 4px 5px,
      transparent 5px 8px,
      var(--reader-page-stack-line) 8px 9px,
      transparent 9px 100%);
}

.reader-main.single-page-right #epub-viewer::before {
  background:
    linear-gradient(90deg,
      transparent 0% calc(100% - 9px),
      var(--reader-page-stack-line) calc(100% - 9px) calc(100% - 8px),
      transparent calc(100% - 8px) calc(100% - 5px),
      var(--reader-page-stack-line) calc(100% - 5px) calc(100% - 4px),
      transparent calc(100% - 4px) calc(100% - 1px),
      var(--reader-page-stack-line) calc(100% - 1px) 100%);
}

.reader-main.two-page-mode #epub-viewer::before {
  background:
    linear-gradient(90deg,
      var(--reader-page-stack-line) 0px 1px,
      transparent 1px 4px,
      var(--reader-page-stack-line) 4px 5px,
      transparent 5px 8px,
      var(--reader-page-stack-line) 8px 9px,
      transparent 9px calc(100% - 9px),
      var(--reader-page-stack-line) calc(100% - 9px) calc(100% - 8px),
      transparent calc(100% - 8px) calc(100% - 5px),
      var(--reader-page-stack-line) calc(100% - 5px) calc(100% - 4px),
      transparent calc(100% - 4px) calc(100% - 1px),
      var(--reader-page-stack-line) calc(100% - 1px) 100%);
}

.reader-main.single-page-left #epub-viewer::after,
.reader-main.single-page-right #epub-viewer::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 40px;
  pointer-events: none;
  z-index: 2;
}

.reader-main.single-page-left #epub-viewer::after {
  right: 0;
  background:
    radial-gradient(42% 165% at 100% 50%,
      rgba(86, 61, 30, 0.16) 0%,
      rgba(86, 61, 30, 0.07) 28%,
      transparent 60%),
    linear-gradient(90deg,
      transparent 0%,
      transparent calc(100% - 20px),
      rgba(120, 92, 57, 0.08) calc(100% - 9px),
      var(--reader-gutter-shadow) 100%),
    linear-gradient(90deg,
      transparent 0%,
      transparent calc(100% - 1px),
      var(--spread-divider-color) calc(100% - 1px),
      var(--spread-divider-color) 100%),
    linear-gradient(90deg,
      transparent 0%,
      transparent calc(100% - 20px),
      rgba(120, 92, 57, 0.08) calc(100% - 9px),
      transparent 100%);
}

.reader-main.single-page-right #epub-viewer::after {
  left: 0;
  background:
    radial-gradient(42% 165% at 0% 50%,
      rgba(86, 61, 30, 0.16) 0%,
      rgba(86, 61, 30, 0.07) 28%,
      transparent 60%),
    linear-gradient(-90deg,
      transparent 0%,
      transparent calc(100% - 20px),
      rgba(120, 92, 57, 0.08) calc(100% - 9px),
      var(--reader-gutter-shadow) 100%),
    linear-gradient(-90deg,
      transparent 0%,
      transparent calc(100% - 1px),
      var(--spread-divider-color) calc(100% - 1px),
      var(--spread-divider-color) 100%),
    linear-gradient(-90deg,
      transparent 0%,
      transparent calc(100% - 20px),
      rgba(120, 92, 57, 0.08) calc(100% - 9px),
      transparent 100%);
}

.reader-main.two-page-mode::before {
  content: none;
}

.reader-main.two-page-mode::after {
  content: none;
}

.reader-main.two-page-mode #epub-viewer::after {
  content: '';
  position: absolute;
  top: calc(var(--spread-top-margin) + 10px);
  bottom: calc(var(--spread-bottom-margin) + 20px);
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  background: var(--spread-divider-color);
  pointer-events: none;
  z-index: 2;
}

.reader-page-number,
.reader-page-number-left,
.reader-page-number-right,
.reader-page-top-left,
.reader-page-top-right {
  position: absolute;
  font-size: 13px;
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  font-variant-numeric: tabular-nums;
  text-align: center;
  pointer-events: none;
  z-index: 4;
}

.reader-page-number,
.reader-page-number-left,
.reader-page-number-right {
  bottom: var(--page-number-bottom);
}

.reader-page-top-left,
.reader-page-top-right {
  top: 10px;
  font-size: 12px;
  display: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* chapter info is now in the toolbar sub-header — never overlay pages */
.reader-main.two-page-mode .reader-page-top-left,
.reader-main.two-page-mode .reader-page-top-right { display: none !important; }

.reader-page-number {
  left: calc(var(--viewer-left-offset) + var(--spread-outer-margin));
  right: calc(var(--viewer-right-offset) + var(--spread-outer-margin));
}

.reader-main.single-page-left .reader-page-number,
.reader-main.single-page-right .reader-page-number {
  width: auto;
}

.reader-main.single-page-left .reader-page-number {
  left: calc(var(--viewer-left-offset) + var(--spread-outer-margin));
  right: calc(var(--viewer-right-offset) + var(--spread-outer-margin));
}

.reader-main.single-page-right .reader-page-number {
  left: calc(var(--viewer-left-offset) + var(--spread-outer-margin));
  right: calc(var(--viewer-right-offset) + var(--spread-outer-margin));
}

.reader-page-number-left,
.reader-page-number-right {
  display: none;
}

.reader-page-top-left {
  left: calc(var(--viewer-left-offset) + var(--spread-outer-margin));
  right: calc(var(--viewer-mid-from-right) + var(--spread-gap-half));
}

.reader-page-top-right {
  left: calc(var(--viewer-mid-from-left) + var(--spread-gap-half));
  right: calc(var(--viewer-right-offset) + var(--spread-outer-margin));
}

.reader-main.two-page-mode .reader-page-number {
  display: none;
}

.reader-main.two-page-mode .reader-page-number-left,
.reader-main.two-page-mode .reader-page-number-right,
.reader-main.two-page-mode .reader-page-top-left,
.reader-main.two-page-mode .reader-page-top-right {
  display: block;
}

.reader-main.two-page-mode .reader-page-number-left {
  left: calc(var(--viewer-left-offset) + var(--spread-outer-margin));
  right: calc(var(--viewer-mid-from-right) + var(--spread-gap-half));
}

.reader-main.two-page-mode .reader-page-number-right {
  left: calc(var(--viewer-mid-from-left) + var(--spread-gap-half));
  right: calc(var(--viewer-right-offset) + var(--spread-outer-margin));
}

/* ── Navigation buttons ───────────────────────────────────── */
.reader-nav-btn {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 5;
  background: none; border: none; cursor: pointer; font-size: 56px; line-height: 1;
  color: rgba(128,128,128,0.28); padding: 24px 6px; transition: color 0.15s; user-select: none;
}
.reader-nav-btn:hover { color: rgba(128,128,128,0.7); }
#prev-btn { left: calc(var(--viewer-left-offset, 0px) + 10px); }
#next-btn { right: calc(var(--viewer-right-offset, 0px) + 10px); }

/* ── Side panels ─────────────────────────────────────────── */
.side-panel {
  width: 300px; flex-shrink: 0; background: var(--panel-bg);
  display: flex; flex-direction: column; overflow: hidden; z-index: 8; position: relative;
}
.side-panel.hidden { display: none; }
.left-panel  { border-right: 1px solid var(--panel-border); }
.right-panel { border-left: 1px solid var(--panel-border); }

.panel-resize-handle {
  position: absolute; top: 0; bottom: 0; width: 12px; z-index: 9;
  cursor: col-resize; touch-action: none;
}
.left-panel > .panel-resize-handle { right: -6px; }
.right-panel > .panel-resize-handle { left: -6px; }
.panel-resize-handle::after {
  content: "";
  position: absolute; top: 0; bottom: 0; left: 50%; width: 2px;
  transform: translateX(-50%);
  background: rgba(255,255,255,0);
  transition: background 0.12s ease;
}
.side-panel:hover > .panel-resize-handle::after,
.panel-resize-handle:hover::after,
.panel-resize-handle.active::after {
  background: rgba(143, 182, 234, 0.6);
}

body.panel-resizing,
body.panel-resizing * {
  cursor: col-resize !important;
  user-select: none !important;
}

.side-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--panel-border); flex-shrink: 0; gap: 8px;
}
.side-panel-header h3 { font-size: 14px; font-weight: 600; color: var(--text); }
.side-panel-header strong { font-size: 14px; font-weight: 600; color: var(--text); }
.side-panel-header-right { display: flex; align-items: center; gap: 4px; }

/* ── TOC ──────────────────────────────────────────────────── */
.toc-list { flex: 1; overflow-y: auto; padding: 6px 0; }
.toc-items { list-style: none; }
.toc-items > li > a {
  display: block; padding: 8px 16px; color: var(--text); text-decoration: none;
  font-size: 14px; transition: background 0.1s;
}
.toc-items > li > a:hover { background: rgba(255,255,255,0.06); }
.toc-items ul { list-style: none; }
.toc-items ul a { display: block; padding: 6px 16px 6px 28px; color: var(--text-muted); text-decoration: none; font-size: 13px; transition: background 0.1s; }
.toc-items ul a:hover { background: rgba(255,255,255,0.06); }
.toc-empty { padding: 16px; color: var(--text-muted); font-size: 14px; }

/* ── Spine index ─────────────────────────────────────────── */
.spine-list { flex: 1; overflow-y: auto; padding: 8px 0; }
.spine-list a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; color: var(--text); text-decoration: none;
  border-left: 3px solid transparent; transition: background 0.1s, border-color 0.1s;
}
.spine-list a:hover { background: rgba(255,255,255,0.06); }
.spine-list a.active { border-left-color: var(--primary); background: rgba(74,126,255,0.1); font-weight: 600; }
.spine-item-index { min-width: 28px; font-size: 12px; color: var(--text-muted); text-align: right; flex-shrink: 0; }
.spine-item-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.spine-item-pages { color: var(--text-muted); font-size: 11px; flex-shrink: 0; }

/* ── Bookmarks ────────────────────────────────────────────── */
.bookmarks-list { flex: 1; overflow-y: auto; }
.bm-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; cursor: pointer; border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: background 0.1s; gap: 8px;
}
.bm-row:hover { background: rgba(255,255,255,0.06); }
.bm-label { font-size: 13px; color: var(--text); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bm-note { font-size: 11px; color: var(--text-muted); margin-top: 2px; }
.bm-del-btn {
  background: none; border: none; cursor: pointer; color: var(--text-muted);
  font-size: 12px; padding: 4px; opacity: 0; transition: opacity 0.1s; flex-shrink: 0;
}
.bm-row:hover .bm-del-btn { opacity: 1; }
.bm-del-btn:hover { color: #e06060; }
.bm-empty { padding: 16px; color: var(--text-muted); font-size: 13px; line-height: 1.5; }

/* ── Search panel ─────────────────────────────────────────── */
.search-input {
  flex: 1; background: rgba(255,255,255,0.06); border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 14px;
  padding: 7px 10px; outline: none; min-width: 0;
}
.search-input:focus { border-color: var(--primary); }
.search-nav { display: flex; align-items: center; gap: 6px; padding: 6px 14px; border-bottom: 1px solid var(--panel-border); }
.search-count { font-size: 12px; color: var(--text-muted); flex: 1; }
.search-results { flex: 1; overflow-y: auto; }
.search-result {
  padding: 10px 14px; cursor: pointer; border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: 13px; color: var(--text-muted); line-height: 1.4; transition: background 0.1s;
  border-left: 3px solid transparent;
}
.search-result:hover { background: rgba(255,255,255,0.06); }
.search-result.active { background: rgba(74,126,255,0.1); border-left-color: var(--primary); color: var(--text); }
.search-result mark { background: rgba(255, 235, 59, 0.5); color: inherit; border-radius: 2px; padding: 0 1px; }
.search-result-chapter { font-size: 11px; color: var(--text-muted); margin-bottom: 3px; }

/* ── AI chat panel ────────────────────────────────────────── */
#ai-panel { width: 380px; min-width: 0; }
.ai-messages { flex: 1; overflow-y: auto; padding: 12px 14px; display: flex; flex-direction: column; gap: 10px; }
.ai-empty { color: var(--text-muted); font-size: 13px; text-align: center; padding: 32px 16px; line-height: 1.5; }
.ai-bubble {
  max-width: 90%; padding: 10px 14px; border-radius: 12px; font-size: 14px;
  line-height: 1.55; word-wrap: break-word; white-space: pre-wrap;
}
.ai-bubble-user { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 4px; padding: 8px 14px; font-size: 11px; line-height: 1.3; }
.ai-bubble-assistant {
  align-self: flex-start; background: rgba(255,255,255,0.08); color: var(--text);
  border-bottom-left-radius: 4px;
}
.ai-bubble-assistant code { background: rgba(0,0,0,0.2); padding: 1px 4px; border-radius: 3px; font-size: 13px; }
.ai-bubble-assistant pre { background: rgba(0,0,0,0.2); padding: 8px 10px; border-radius: 6px; overflow-x: auto; margin: 6px 0; font-size: 13px; }
.ai-bubble-thinking { color: var(--text-muted); font-style: italic; }
.ai-tools-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-top: 1px solid var(--panel-border);
}
.ai-tools-row.hidden { display: none; }
.ai-translate-select {
  flex: 1;
  min-width: 0;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 13px;
  padding: 7px 10px;
  outline: none;
}
.ai-translate-select:focus { border-color: var(--primary); }
.ai-input-area { display: flex; align-items: center; gap: 6px; padding: 10px 14px; border-top: 1px solid var(--panel-border); }
.ai-tools-row:not(.hidden) + .ai-input-area { border-top: none; }
.ai-input {
  flex: 1; background: rgba(255,255,255,0.06); border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 14px;
  padding: 2px 10px; outline: none; resize: none; min-height: 24px; max-height: 120px;
  font-family: inherit; line-height: 20px;
}
.ai-input:focus { border-color: var(--primary); }
.ai-send-btn { flex-shrink: 0; padding: 5px; }
.ai-send-btn .material-symbols-outlined { font-size: 20px; }

/* ── Context menu ─────────────────────────────────────────── */
.ctx-menu {
  position: fixed; z-index: 300;
  transform: translateX(-50%);
  display: flex; flex-wrap: wrap; gap: 2px;
  max-width: 340px; justify-content: center;
  background: var(--panel-bg); border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(0,0,0,0.18); padding: 4px;
}
.ctx-menu.hidden { display: none; }
.ctx-btn {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 6px 12px; font-size: 13px; border: none; border-radius: 6px;
  background: transparent; color: var(--text); cursor: pointer;
  white-space: nowrap; transition: background 0.1s;
}
.ctx-btn-icon-only {
  width: 32px; min-width: 32px; height: 32px;
  padding: 0; justify-content: center;
}
.ctx-btn-icon-only .material-symbols-outlined { font-size: 18px; line-height: 1; }
.ctx-btn:hover { background: rgba(255,255,255,0.1); }
.ctx-btn.active { background: rgba(59,130,246,0.35); color: #93c5fd; }
.ctx-hl-group { display: flex; align-items: center; gap: 2px; }
.ctx-recent-colors { display: flex; gap: 4px; padding: 0 4px; }
.ctx-recent-swatch {
  width: 18px; height: 18px; border-radius: 50%; cursor: pointer;
  border: 2px solid rgba(255,255,255,0.2); transition: transform 0.1s, border-color 0.1s;
  flex-shrink: 0;
}
.ctx-recent-swatch:hover { transform: scale(1.2); border-color: rgba(255,255,255,0.5); }
.ctx-recent-swatch.active {
  transform: scale(1.08); border-color: #fff;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.5);
}

/* ── Note modal ───────────────────────────────────────────── */
.note-textarea {
  width: 100%; background: rgba(255,255,255,0.06); border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 14px;
  padding: 10px; outline: none; resize: vertical; font-family: inherit;
}
.note-textarea:focus { border-color: var(--primary); }

/* ── Definition popup ─────────────────────────────────────── */
.def-popup {
  position: fixed; z-index: 350; background: var(--panel-bg);
  border: 1px solid var(--panel-border); border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5); width: 340px; max-height: 400px;
  display: flex; flex-direction: column; overflow: hidden;
}
.def-popup.hidden { display: none; }
.def-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--panel-border);
}
.def-word { font-size: 16px; font-weight: 600; color: var(--text); }
.def-content { padding: 12px 14px; overflow-y: auto; font-size: 14px; color: var(--text); line-height: 1.55; }
.def-content .def-pos { color: var(--primary); font-style: italic; margin-right: 6px; }
.def-content .def-meaning { margin-bottom: 8px; }


/* ── Image zoom overlay ───────────────────────────────────── */
.img-zoom-overlay {
  position: fixed; inset: 0; z-index: 9999; background: rgba(0,0,0,0.85);
  display: flex; align-items: center; justify-content: center; cursor: pointer;
}
.img-zoom-overlay.hidden { display: none; }
.img-zoom-el { max-width: 90vw; max-height: 85vh; object-fit: contain; cursor: default; }

/* ── Reader settings form ────────────────────────────────── */
.reader-settings-form { flex: 1; overflow-y: auto; padding: 14px; display: flex; flex-direction: column; gap: 0; }
.settings-label { display: flex; flex-direction: column; gap: 8px; }
.settings-label-text { font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); font-weight: 500; }
.settings-label.settings-section-disclosable {
  gap: 0;
  border-bottom: 1px solid var(--panel-border);
  padding: 6px 0;
}
.settings-label.settings-section-disclosable > :not(.settings-label-text) {
  margin-top: 12px;
}
.settings-label.settings-section-disclosable .settings-label-text {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  padding: 6px 8px;
  font-size: 11px;
  color: var(--text-muted);
  outline: none;
}
.settings-label.settings-section-disclosable .settings-label-text::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 6px solid currentColor;
  flex-shrink: 0;
  transition: transform 0.14s ease;
}
.settings-label.settings-section-disclosable:not(.collapsed) .settings-label-text::before {
  transform: rotate(90deg);
}
.settings-label.settings-section-disclosable .settings-label-text:hover,
.settings-label.settings-section-disclosable .settings-label-text:focus-visible {
  color: var(--text);
}
.settings-label.settings-section-disclosable.collapsed > :not(.settings-label-text) {
  height: 0;
  overflow: hidden;
  visibility: hidden;
  margin: 0;
  padding: 0;
  border-width: 0;
}
.settings-control-row { display: flex; align-items: center; gap: 8px; }
.settings-control-row label { font-size: 13px; font-weight: 400; color: var(--text-muted); min-width: 42px; }
.settings-sub-controls { display: flex; flex-direction: column; gap: 6px; }

.settings-llm-row { display: flex; align-items: center; gap: 6px; }
.settings-llm-row .settings-select { flex: 1; }
.settings-api-key-row { margin-top: 6px; }
.settings-api-key-row .settings-input { margin-top: 0; }
#pwa-api-key-btn.active { color: var(--primary); }

.settings-select {
  flex: 1; background: rgba(255,255,255,0.06); border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 13px;
  padding: 1px 24px 1px 8px; min-height: 24px; height: 24px; line-height: 1.1;
  outline: none; cursor: pointer;
}
.settings-select:focus { border-color: var(--primary); }
.settings-select option { background: var(--panel-bg); color: var(--text); }

.theme-picker { display: flex; gap: 8px; flex-wrap: wrap; }
.theme-swatch {
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer;
  border: 3px solid transparent; transition: border-color 0.15s, transform 0.12s;
}
.theme-swatch:hover { transform: scale(1.1); }
.theme-swatch.active { border-color: var(--primary); }
.ts-light { background: #ffffff; }
.ts-sepia { background: #f4ecd8; }
.ts-gray  { background: #f0f1f3; }
.ts-dark  { background: #1e1e1e; }
.ts-night { background: #30353C; }

.hl-color-picker { display: flex; flex-direction: column; gap: 0; }
.hl-color-row { display: flex; gap: 4px; margin-bottom: 4px; }
.hl-swatch {
  width: 22px; height: 22px; border-radius: 4px; cursor: pointer;
  border: 2px solid transparent; transition: border-color 0.1s, transform 0.1s;
}
.hl-swatch:hover { transform: scale(1.15); border-color: rgba(0,0,0,0.3); }
.hl-swatch.active { border-color: #333; }

.settings-actions-row { display: flex; gap: 8px; flex-wrap: wrap; }
.settings-actions-row .pwa-btn { flex: 1; min-width: 80px; }
.settings-actions-row .pwa-btn.active {
  background: var(--primary);
  color: var(--primary-text);
}
.settings-actions-icon-row { gap: 5px; flex-wrap: nowrap; justify-content: flex-start; }
.settings-actions-icon-row .pwa-btn { flex: 0 0 auto; min-width: 0; }
.pwa-btn-icon-only {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; min-width: 30px; max-width: 30px; height: 30px; min-height: 30px;
  padding: 0; flex: 0 0 30px;
  border: 1px solid var(--panel-border); border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.06); color: var(--text); cursor: pointer;
}
.pwa-btn-icon-only .material-symbols-outlined { font-size: 18px; line-height: 1; }
.pwa-btn-icon-only:hover { background: rgba(255,255,255,0.12); }
.pwa-btn-icon-only[aria-pressed="true"],
.pwa-btn-icon-only.active {
  background: var(--primary); color: var(--primary-text); border-color: var(--primary);
}
.pwa-btn-icon-only[aria-pressed="true"]:hover,
.pwa-btn-icon-only.active:hover {
  background: var(--primary-hover); border-color: var(--primary-hover);
}
.settings-mode-group { display: flex; gap: 5px; }

/* ── Modal ────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200; background: var(--modal-overlay);
  backdrop-filter: blur(5px); display: flex; align-items: center;
  justify-content: center; padding: 20px;
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--panel-bg); border: 1px solid var(--panel-border);
  border-radius: 16px; width: 100%; max-width: 480px;
  display: flex; flex-direction: column; overflow: hidden;
  max-height: calc(100dvh - 40px); box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.modal-sm { max-width: 380px; }
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-bottom: 1px solid var(--panel-border);
}
.modal-header h2 { font-size: 16px; font-weight: 600; color: var(--text); }
.modal-body { flex: 1; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 18px; }
.modal-footer { padding: 12px 18px; border-top: 1px solid var(--panel-border); display: flex; justify-content: flex-end; gap: 8px; }
.settings-section { display: flex; flex-direction: column; gap: 10px; }
.settings-section h3 { font-size: 14px; font-weight: 600; color: var(--text); }
.settings-note { font-size: 13px; color: var(--text-muted); line-height: 1.55; }
.settings-note a { color: var(--primary); text-decoration: none; }
.settings-note a:hover { text-decoration: underline; }
.settings-input {
  display: block; width: 100%; padding: 10px 12px;
  background: rgba(255,255,255,0.06); border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 14px;
  font-family: monospace; outline: none; transition: border-color 0.15s; margin-top: 6px;
}
.settings-input:focus { border-color: var(--primary); }

/* ── Toast ────────────────────────────────────────────────── */
.pwa-toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(16px);
  background: var(--toast-bg); color: var(--text); padding: 10px 22px;
  border-radius: 24px; font-size: 14px; border: 1px solid var(--panel-border);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3); opacity: 0; pointer-events: none;
  z-index: 500; white-space: nowrap; transition: opacity 0.2s, transform 0.2s;
}
.pwa-toast.visible { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── Install banner ───────────────────────────────────────── */
.install-banner {
  position: fixed; bottom: 24px; right: 24px; z-index: 250;
  background: var(--panel-bg); border: 1px solid var(--panel-border);
  border-radius: 16px; padding: 16px 18px; display: flex;
  align-items: center; gap: 16px; box-shadow: 0 8px 32px rgba(0,0,0,0.45); max-width: 340px;
}
.install-banner.hidden { display: none; }
.install-banner-text { flex: 1; display: flex; flex-direction: column; gap: 3px; }
.install-banner-text strong { font-size: 14px; color: var(--text); }
.install-banner-text span   { font-size: 12px; color: var(--text-muted); }
.install-banner-actions { display: flex; gap: 6px; align-items: center; flex-shrink: 0; }

/* ── Reader loading/error ─────────────────────────────────── */
.reader-loading, .reader-error {
  display: flex; align-items: center; justify-content: center;
  width: 100%; height: 100%; font-size: 15px; color: var(--text-muted);
}
.reader-error { color: #d06060; }

/* ── TTS word highlight ───────────────────────────────────── */
.tts-word-hl { background: rgba(108, 163, 132, 0.52); border-radius: 2px; }

/* ── Highlight rows in bookmarks ──────────────────────────── */
.hl-row {
  display: flex; align-items: flex-start; gap: 8px; padding: 8px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.04); cursor: pointer;
  transition: background 0.1s;
}
.hl-row:hover { background: rgba(255,255,255,0.04); }
.hl-color-dot { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; margin-top: 3px; }
.hl-text { font-size: 12px; color: var(--text-muted); line-height: 1.4; flex: 1; }
.hl-note-preview { font-size: 11px; color: var(--primary); margin-top: 2px; }

/* ── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.14); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.24); }

/* ── Material Symbols fallback ────────────────────────────── */
.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal; font-style: normal; font-size: 24px;
  line-height: 1; letter-spacing: normal; text-transform: none;
  display: inline-block; white-space: nowrap; word-wrap: normal;
  direction: ltr; -webkit-font-smoothing: antialiased;
  font-feature-settings: 'liga';
}

/* ── Auth View ───────────────────────────────────────────── */
#auth-view {
  display: none;
  justify-content: center;
  align-items: center;
  min-height: 100dvh;
  background: var(--lib-bg, #13132b);
  padding: 1rem;
}
#auth-view.active { display: flex; }

.auth-container {
  width: 100%;
  max-width: 380px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 2.5rem 2rem 2rem;
  text-align: center;
}

.auth-logo {
  font-size: 3rem;
  margin-bottom: 0.25rem;
}

.auth-title {
  font-family: 'Lato', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: #eee;
  margin: 0 0 0.25rem;
}

.auth-subtitle {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  margin: 0 0 1.5rem;
}

#auth-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.auth-input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-size: 0.95rem;
  font-family: inherit;
  color: #eee;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 8px;
  outline: none;
  transition: border-color 0.15s;
  box-sizing: border-box;
}
.auth-input:focus {
  border-color: var(--accent, #6c63ff);
}
.auth-input::placeholder { color: rgba(255,255,255,0.3); }

.auth-submit {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  margin-top: 0.25rem;
}

.auth-error {
  color: #ff6b6b;
  font-size: 0.85rem;
  margin: 0;
  text-align: left;
}

.auth-success {
  color: #69db7c;
  font-size: 0.85rem;
  margin: 0;
  text-align: left;
}

.auth-toggle {
  background: none;
  border: none;
  color: rgba(255,255,255,0.5);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.75rem 0 0;
  font-family: inherit;
}
.auth-toggle:hover { color: rgba(255,255,255,0.8); }
.auth-toggle strong { color: var(--accent, #6c63ff); }

.auth-forgot {
  background: none;
  border: none;
  color: rgba(255,255,255,0.4);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0.25rem 0 0;
  font-family: inherit;
}
.auth-forgot:hover { color: rgba(255,255,255,0.7); }