/* ════════════════════════════════════════������══════════════
   books.css — Books Tab: library grid, reader, responsive
   ═══════════════════════════════════════════════════════ */

/* ─── Library Layout ──────────────────────────────── */
.books-container { padding: 0; height: 100%; display: flex; flex-direction: column; overflow: hidden; }

.books-toolbar {
  display: flex; align-items: center; gap: 8px; padding: 10px 16px;
  border-bottom: 1px solid var(--border); flex-wrap: wrap; flex-shrink: 0;
}
.books-toolbar .btn-add-book {
  background: var(--accent, #2196F3); color: #fff; border: none;
  padding: 7px 16px; border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: 600;
}
.books-toolbar .btn-add-book:hover { filter: brightness(1.1); }
.books-toolbar .btn-refresh-books {
  background: none; border: 1px solid var(--border); color: var(--text-dim);
  padding: 6px 12px; border-radius: 6px; cursor: pointer; font-size: 13px;
}

.book-filters { display: flex; gap: 4px; }
.book-filter {
  background: none; border: 1px solid transparent; color: var(--text-dim);
  padding: 5px 10px; border-radius: 14px; cursor: pointer; font-size: 12px;
}
.book-filter.active { border-color: var(--accent, #2196F3); color: var(--accent, #2196F3); background: rgba(33,150,243,0.08); }

.book-sort {
  background: var(--bg, #0f1117); border: 1px solid var(--border); color: var(--text-dim);
  padding: 5px 8px; border-radius: 6px; font-size: 12px; cursor: pointer;
}

/* ─── Add Book Dialog ─────────────────────────────── */
.add-book-dialog {
  padding: 16px; border-bottom: 1px solid var(--border);
  background: var(--bg-card, #1a1a2e); display: flex; flex-wrap: wrap; gap: 10px; align-items: end;
}
.add-book-dialog .file-upload-area { flex: 1 1 100%; display: flex; flex-direction: column; gap: 6px; }
.add-book-dialog .file-upload-zone {
  border: 2px dashed var(--border); border-radius: 8px; padding: 24px;
  text-align: center; cursor: pointer; transition: border-color 0.2s;
  color: var(--text-dim); font-size: 14px;
}
.add-book-dialog .file-upload-zone:hover,
.add-book-dialog .file-upload-zone.drag-over { border-color: var(--accent, #2196F3); background: rgba(33,150,243,0.04); }
.add-book-dialog .file-upload-zone .upload-icon { font-size: 32px; margin-bottom: 8px; }
.add-book-dialog input[type="text"] {
  flex: 1 1 200px; background: var(--bg, #0f1117); border: 1px solid var(--border);
  color: var(--text); padding: 8px 12px; border-radius: 6px; font-size: 13px;
}
.add-book-dialog .btn-primary {
  background: var(--accent, #2196F3); color: #fff; border: none;
  padding: 8px 20px; border-radius: 6px; cursor: pointer; font-weight: 600;
}
.add-book-dialog .btn-secondary {
  background: none; border: 1px solid var(--border); color: var(--text-dim);
  padding: 8px 16px; border-radius: 6px; cursor: pointer;
}

/* ─── Book Grid ───────────────────────────────────── */
#books-list {
  flex: 1; overflow-y: auto; padding: 16px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px; align-content: start;
}

/* ─── Group Headers ───────────────────────────────── */
.book-group-header {
  grid-column: 1 / -1;
  font-size: 14px; font-weight: 700; color: var(--text);
  padding: 12px 0 6px 0; margin-top: 8px;
  border-bottom: 2px solid var(--accent, #2196F3);
}
.book-group-header:first-child { margin-top: 0; }
.book-group-count { font-weight: 400; color: var(--text-dim); font-size: 12px; }

/* ─── Book Card ───────────────────────────────────── */
.book-card {
  position: relative; cursor: pointer; border-radius: 8px;
  background: var(--bg-card, #1a1a2e); border: 1px solid var(--border);
  overflow: visible; transition: transform 0.15s, box-shadow 0.15s;
}
.book-card:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0,0,0,0.25); }

.book-cover { aspect-ratio: 2/3; overflow: hidden; background: var(--bg, #0f1117); border-radius: 8px 8px 0 0; }
.book-cover-img { width: 100%; height: 100%; object-fit: cover; }
.book-cover-placeholder {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  font-size: 48px; font-weight: 700; color: var(--accent, #2196F3); opacity: 0.3;
  background: linear-gradient(135deg, rgba(33,150,243,0.1), rgba(156,39,176,0.1));
}

.book-info { padding: 10px; }
.book-title { font-size: 13px; font-weight: 600; color: var(--text); line-height: 1.3;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.book-author { font-size: 11px; color: var(--text-dim); margin-top: 3px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.book-badge {
  display: inline-block; font-size: 10px; padding: 2px 8px; border-radius: 10px;
  margin-top: 4px; margin-right: 4px; font-weight: 600;
}
.book-badge.reading { background: rgba(33,150,243,0.15); color: #2196F3; }
.book-badge.finished { background: rgba(76,175,80,0.15); color: #4CAF50; }
.book-badge.category { background: rgba(156,39,176,0.12); color: #ba68c8; }

.book-rating { display: block; font-size: 11px; color: #ffc107; margin-top: 3px; letter-spacing: 1px; }

.book-progress { height: 3px; background: var(--border); border-radius: 2px; margin-top: 6px; overflow: hidden; }
.book-progress-bar { height: 100%; background: var(--accent, #2196F3); border-radius: 2px; transition: width 0.3s; }

/* ─── Book Context Menu ───────────────────────────── */
.book-menu-btn {
  position: absolute; top: 6px; right: 6px; background: rgba(0,0,0,0.6); color: #fff;
  border: none; border-radius: 50%; width: 26px; height: 26px; cursor: pointer;
  font-size: 16px; line-height: 26px; text-align: center; opacity: 0; transition: opacity 0.15s;
  z-index: 5;
}
.book-card:hover .book-menu-btn { opacity: 1; }
.book-menu {
  position: absolute; top: 34px; right: 0;
  background: var(--bg-card, #1e1e2e);
  border: 1px solid var(--border); border-radius: 8px; z-index: 100;
  min-width: 140px; max-width: 180px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3); overflow: hidden;
}
.book-menu button {
  display: block; width: 100%; text-align: left; background: none; border: none;
  color: var(--text); padding: 8px 12px; cursor: pointer; font-size: 13px;
}
.book-menu button:hover { background: var(--bg-hover, rgba(255,255,255,0.05)); }

/* ─── Empty State ─────────────────────────────────── */
.books-empty-state {
  grid-column: 1 / -1; text-align: center; padding: 60px 20px; color: var(--text-dim);
}
.books-empty-icon { font-size: 64px; margin-bottom: 16px; }
.books-empty-state h3 { color: var(--text); margin-bottom: 8px; }
.books-empty-state p { margin-bottom: 20px; }

/* ─── Reader — FIXED LAYOUT ──────────────────────── */
#book-reader-container {
  display: flex; flex-direction: column; height: 100%;
  background: var(--bg, #0f1117); overflow: hidden;
}
#book-reader-container .reader-header {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px;
  border-bottom: 1px solid var(--border); background: var(--bg-card, #1a1a2e);
  min-height: 42px; flex-shrink: 0;
}
#book-reader-container .reader-header .btn-back {
  background: none; border: none; color: var(--text-dim); cursor: pointer;
  font-size: 18px; padding: 4px 8px; border-radius: 4px; flex-shrink: 0;
}
#book-reader-container .reader-header .btn-back:hover { background: var(--bg-hover); }
#reader-book-title {
  flex: 1; font-size: 14px; font-weight: 600; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0;
}
#book-reader-container .reader-controls { display: flex; gap: 2px; align-items: center; flex-shrink: 0; flex-wrap: nowrap; }
#book-reader-container .reader-controls button {
  background: none; border: none; color: var(--text-dim); cursor: pointer;
  padding: 4px 6px; border-radius: 4px; font-size: 16px; flex-shrink: 0;
}
#book-reader-container .reader-controls button:hover { background: var(--bg-hover); color: var(--text); }

#book-reader-container .reader-body { flex: 1; display: flex; position: relative; overflow: hidden; min-height: 0; }

#book-reader-viewer { flex: 1; overflow: hidden; position: relative; }
#book-reader-viewer iframe {
  border: none !important; position: absolute !important;
  top: 0 !important; left: 0 !important; width: 100% !important; height: 100% !important;
}

#book-reader-container .reader-nav {
  position: absolute; top: 0; bottom: 0; width: 60px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; z-index: 5; background: transparent; border: none;
  color: var(--text-dim); font-size: 28px; opacity: 0; transition: opacity 0.2s;
}
#book-reader-container .reader-nav:hover { opacity: 0.8; background: rgba(0,0,0,0.08); }
#book-reader-container .reader-nav.prev { left: 0; }
#book-reader-container .reader-nav.next { right: 0; }

#book-reader-container .reader-footer {
  display: flex; align-items: center; gap: 10px; padding: 6px 12px;
  border-top: 1px solid var(--border); background: var(--bg-card, #1a1a2e);
  font-size: 12px; color: var(--text-dim); flex-shrink: 0;
}
.reader-progress-track { flex: 1; height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; }
#reader-progress-bar { height: 100%; background: var(--accent, #2196F3); border-radius: 2px; transition: width 0.3s; width: 0; }

/* ─── TOC Panel ───────────────────────────────────── */
#reader-toc {
  position: absolute; top: 0; left: 0; bottom: 0; width: 280px;
  background: var(--bg-card, #1a1a2e); border-right: 1px solid var(--border);
  z-index: 10; overflow-y: auto; box-shadow: 4px 0 16px rgba(0,0,0,0.3);
}
.reader-toc-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; border-bottom: 1px solid var(--border);
}
.reader-toc-header h3 { margin: 0; font-size: 14px; }
.btn-close-toc { background: none; border: none; color: var(--text-dim); font-size: 20px; cursor: pointer; }
.toc-item {
  padding: 8px 12px; cursor: pointer; font-size: 13px; color: var(--text);
  border-bottom: 1px solid rgba(255,255,255,0.03); transition: background 0.15s;
}
.toc-item:hover { background: var(--bg-hover); }
.bm-date { font-size: 10px; color: var(--text-dim); margin-left: 8px; }

.pdf-reader-frame { width: 100%; height: 100%; border: none; }

.text-reader-wrap { overflow-y: auto; min-height: 100%; }
.text-reader-wrap p { margin: 0 0 1em 0; text-indent: 1.5em; }
.text-reader-wrap h1, .text-reader-wrap h2, .text-reader-wrap h3 { margin: 1.5em 0 0.5em 0; text-indent: 0; }

.reader-toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%) translateY(80px);
  background: var(--bg-card, #1e1e2e); color: var(--text); padding: 8px 20px;
  border-radius: 20px; font-size: 13px; z-index: 9999; box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  opacity: 0; transition: all 0.3s ease; pointer-events: none;
}
.reader-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.reader-theme-btns { display: flex; gap: 3px; margin-left: 4px; }
.reader-theme-btn {
  width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--border);
  cursor: pointer; transition: border-color 0.15s; flex-shrink: 0;
}
.reader-theme-btn:hover, .reader-theme-btn.active { border-color: var(--accent, #2196F3); }



/* ═════════════════════════════��═════════════════════════
   RESPONSIVE BREAKPOINTS
   ═══════════════════════════════════════════════════════ */

/* ─── Tablet (≤1024) ──────────────────────────────── */
@media (max-width: 1024px) {
  #book-reader-container .reader-nav { width: 40px; font-size: 22px; }
  .books-toolbar .book-sort { font-size: 11px; padding: 4px 6px; }
}

/* ─── Small Tablet / Large Phone (≤768) ───────────── */
@media (max-width: 768px) {
  #books-list {
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 10px; padding: 10px;
  }
  .books-toolbar { padding: 8px 10px; gap: 6px; }
  .books-toolbar .book-filters { order: 10; flex-basis: 100%; }
  .book-info { padding: 6px 8px; }
  .book-title { font-size: 12px; }
  .book-author { font-size: 10px; }

  #book-reader-container .reader-header { padding: 6px 8px; gap: 4px; }
  #reader-book-title { font-size: 12px; }
  #book-reader-container .reader-controls button { padding: 4px; font-size: 14px; }
  .reader-theme-btns { display: flex; gap: 2px; }
  .reader-theme-btn { width: 16px; height: 16px; border-width: 1px; }
  #book-reader-container .reader-nav { width: 30px; font-size: 18px; }
  #reader-toc { width: 100%; }

  .add-book-dialog { padding: 12px; gap: 8px; }
  .add-book-dialog input[type="text"] { flex: 1 1 100%; }
  .add-book-dialog .file-upload-zone { padding: 16px; font-size: 13px; }
}

/* ─── Phone (≤640) ────────────────────────────────── */
@media (max-width: 640px) {
  #books-list {
    grid-template-columns: repeat(auto-fill, minmax(95px, 1fr));
    gap: 8px; padding: 8px;
  }
  .book-cover-placeholder { font-size: 32px; }

  .books-toolbar { gap: 4px; padding: 6px 8px; }
  .books-toolbar .btn-add-book { padding: 6px 12px; font-size: 12px; }
  .books-toolbar .btn-refresh-books { padding: 5px 8px; font-size: 12px; }
  .book-filter { padding: 4px 8px; font-size: 11px; }
  .book-sort { padding: 4px 6px; font-size: 11px; }

  .book-badge { font-size: 9px; padding: 1px 5px; }
  .book-rating { font-size: 10px; }
  .book-group-header { font-size: 13px; }

  .book-menu { min-width: 120px; }
  .book-menu button { padding: 7px 10px; font-size: 12px; }
}

/* ─── Small Phone (≤480) ──────────────────────────── */
@media (max-width: 480px) {
  #books-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px; padding: 6px;
  }
  .book-info { padding: 4px 6px; }
  .book-title { font-size: 11px; -webkit-line-clamp: 1; }
  .book-author { font-size: 9px; }
  .book-badge { font-size: 8px; padding: 1px 4px; margin-top: 2px; }
  .book-badge.category { display: none; }
  .book-rating { font-size: 9px; }

  #book-reader-container .reader-header { padding: 4px 6px; gap: 4px; min-height: 38px; }
  #book-reader-container .reader-header .btn-back { padding: 2px 6px; font-size: 16px; }
  #reader-book-title { font-size: 11px; }
  #book-reader-container .reader-controls button { padding: 2px 3px; font-size: 12px; }
  #book-reader-container .reader-nav { width: 24px; font-size: 16px; }
  #book-reader-container .reader-footer { padding: 4px 8px; font-size: 11px; }

  .add-book-dialog { flex-direction: column; align-items: stretch; padding: 10px; }
  .add-book-dialog input[type="text"] { flex: 1 1 auto; font-size: 12px; padding: 6px 10px; }
  .add-book-dialog .file-upload-zone { padding: 12px; font-size: 12px; }
  .add-book-dialog .file-upload-zone .upload-icon { font-size: 24px; }
  .add-book-dialog .btn-primary,
  .add-book-dialog .btn-secondary { width: 100%; text-align: center; }

  .book-menu-btn { width: 22px; height: 22px; font-size: 14px; line-height: 22px; top: 4px; right: 4px; }
  .book-menu { right: -4px; min-width: 110px; }
  .book-menu button { padding: 6px 8px; font-size: 11px; }

  .books-empty-state { padding: 30px 16px; }
  .books-empty-icon { font-size: 48px; }
}

/* ─── Very Small Phone (≤360) ─────────────────────── */
@media (max-width: 360px) {
  #books-list { grid-template-columns: repeat(2, 1fr); gap: 6px; }
  .books-toolbar .book-filters { gap: 2px; }
  .book-filter { padding: 3px 6px; font-size: 10px; }
  .book-sort { font-size: 10px; }
}



/* ─── Fullscreen Reader Mode ──────────────────────── */
body.reader-fullscreen { overflow: hidden !important; }
body.reader-fullscreen #dashboard > header { display: none !important; }
body.reader-fullscreen .books-toolbar { display: none !important; }
body.reader-fullscreen .books-container > .book-filters { display: none !important; }
body.reader-fullscreen #bottom-nav { display: none !important; }
body.reader-fullscreen #tab-books {
  position: fixed !important; inset: 0 !important; z-index: 9000;
  height: 100vh !important; width: 100vw !important;
  margin: 0 !important; padding: 0 !important; border: none !important;
}
body.reader-fullscreen .books-container {
  height: 100vh !important; border: none !important; margin: 0 !important; padding: 0 !important;
}
body.reader-fullscreen #book-reader-container {
  height: 100vh !important; border: none !important; border-radius: 0 !important;
  margin: 0 !important; padding: 0 !important;
}
body.reader-fullscreen .reader-body {
  margin: 0 !important; padding: 0 !important; border: none !important;
}
body.reader-fullscreen #book-reader-viewer {
  margin: 0 !important; padding: 0 !important; border: none !important;
}

.reader-header-compact {
  padding: 4px 8px !important; min-height: 32px !important; gap: 4px !important;
  transition: opacity 0.3s, transform 0.3s; border: none !important;
}
.reader-header-compact #reader-book-title { font-size: 11px !important; }
.reader-header-compact .reader-controls button { padding: 2px 4px !important; font-size: 13px !important; }
.reader-header-compact .reader-theme-btns { display: none !important; }

.reader-footer-compact {
  padding: 2px 8px !important; border: none !important;
  transition: opacity 0.3s, transform 0.3s;
}

.reader-header-autohide { opacity: 0; transform: translateY(-100%); pointer-events: none; }
.reader-footer-autohide { opacity: 0; transform: translateY(100%); pointer-events: none; }

body.reader-fullscreen #book-reader-container:hover .reader-header-autohide,
body.reader-fullscreen #book-reader-container:hover .reader-footer-autohide {
  opacity: 1; transform: translateY(0); pointer-events: auto;
}

#btn-fullscreen { font-size: 16px !important; }

/* ─── Mobile Reader: edge-to-edge ────────��────────── */
@media (max-width: 768px) {
  #book-reader-container {
    border: none !important; border-radius: 0 !important;
    margin: 0 !important;
  }
  #book-reader-container .reader-body { margin: 0 !important; padding: 0 !important; }
  #book-reader-viewer { margin: 0 !important; padding: 0 !important; }
  #book-reader-container .reader-header { border-left: none !important; border-right: none !important; }
  #book-reader-container .reader-footer { padding: 2px 8px !important; border-left: none !important; border-right: none !important; }
  #book-reader-container .reader-nav.prev { left: 0 !important; }
  #book-reader-container .reader-nav.next { right: 0 !important; }
}