/* ==========================================================================
   Ocacode Flipbook — UI theme
   Restyles the toolbar, the side navigation buttons and the thumbnail drawer.
   Loaded AFTER min.css: it only overrides presentation, never the layout
   computed in JS (e.g. the thumb list row pitch of 128px).
   ========================================================================== */

:root {
  --ui-accent: #eb5a3f;
  --ui-accent-strong: #f26e55;
  --ui-accent-soft: rgba(235, 90, 63, 0.18);

  --ui-surface: rgba(20, 20, 24, 0.72);
  --ui-surface-strong: rgba(18, 18, 21, 0.88);
  --ui-elevated: rgba(255, 255, 255, 0.08);
  --ui-elevated-hover: rgba(255, 255, 255, 0.13);

  --ui-line: rgba(255, 255, 255, 0.1);
  --ui-line-soft: rgba(255, 255, 255, 0.06);

  --ui-fg: rgba(255, 255, 255, 0.95);
  --ui-fg-dim: rgba(255, 255, 255, 0.62);

  --ui-radius-lg: 18px;
  --ui-radius: 12px;
  --ui-radius-sm: 9px;

  --ui-shadow: 0 10px 34px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 0, 0, 0.3);
  --ui-shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.35);
  --ui-blur: saturate(165%) blur(20px);

  --ui-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ui-font:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;

  --ui-drawer-w: 220px;
  --ui-drawer-head: 46px;

  /* Icon set — one stroke weight (2), round caps and joins, 24x24 box.
     Used as CSS masks, so the drawn colour is irrelevant. */
  --ui-icon-prev: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m15 18-6-6 6-6'/%3E%3C/svg%3E");
  --ui-icon-next: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m9 18 6-6-6-6'/%3E%3C/svg%3E");
  --ui-icon-first: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m11 17-5-5 5-5'/%3E%3Cpath d='m18 17-5-5 5-5'/%3E%3C/svg%3E");
  --ui-icon-last: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m13 17 5-5-5-5'/%3E%3Cpath d='m6 17 5-5-5-5'/%3E%3C/svg%3E");
  --ui-icon-outline: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M8 6h13M8 12h13M8 18h13M3.5 6h.01M3.5 12h.01M3.5 18h.01'/%3E%3C/svg%3E");
  --ui-icon-thumbnails: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='3' width='7.5' height='7.5' rx='1.5'/%3E%3Crect x='13.5' y='3' width='7.5' height='7.5' rx='1.5'/%3E%3Crect x='3' y='13.5' width='7.5' height='7.5' rx='1.5'/%3E%3Crect x='13.5' y='13.5' width='7.5' height='7.5' rx='1.5'/%3E%3C/svg%3E");
  --ui-icon-zoom-in: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m20.5 20.5-4.2-4.2M11 8.2v5.6M8.2 11h5.6'/%3E%3C/svg%3E");
  --ui-icon-zoom-out: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m20.5 20.5-4.2-4.2M8.2 11h5.6'/%3E%3C/svg%3E");
  --ui-icon-fullscreen: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M8 3H5a2 2 0 0 0-2 2v3M21 8V5a2 2 0 0 0-2-2h-3M3 16v3a2 2 0 0 0 2 2h3M16 21h3a2 2 0 0 0 2-2v-3'/%3E%3C/svg%3E");
  --ui-icon-exit-fullscreen: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M8 3v3a2 2 0 0 1-2 2H3M21 8h-3a2 2 0 0 1-2-2V3M3 16h3a2 2 0 0 1 2 2v3M16 21v-3a2 2 0 0 1 2-2h3'/%3E%3C/svg%3E");
  --ui-icon-share: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='18' cy='5' r='3'/%3E%3Ccircle cx='6' cy='12' r='3'/%3E%3Ccircle cx='18' cy='19' r='3'/%3E%3Cpath d='m8.6 13.5 6.8 4M15.4 6.5l-6.8 4'/%3E%3C/svg%3E");
  --ui-icon-download: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4M7 10l5 5 5-5M12 15V3'/%3E%3C/svg%3E");
  --ui-icon-sound-on: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M11 5 6 9H2v6h4l5 4z'/%3E%3Cpath d='M15.5 8.5a5 5 0 0 1 0 7M19 5.5a9 9 0 0 1 0 13'/%3E%3C/svg%3E");
  --ui-icon-sound-off: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M11 5 6 9H2v6h4l5 4z'/%3E%3Cpath d='m22 9-6 6M16 9l6 6'/%3E%3C/svg%3E");
  --ui-icon-more: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12h.01M12 12h.01M19 12h.01'/%3E%3C/svg%3E");
  --ui-icon-single-page: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M15 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V7z'/%3E%3Cpath d='M14 2v5h5'/%3E%3C/svg%3E");
  --ui-icon-double-page: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 7v14'/%3E%3Cpath d='M3 18a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h5a4 4 0 0 1 4 4 4 4 0 0 1 4-4h5a1 1 0 0 1 1 1v13a1 1 0 0 1-1 1h-6a3 3 0 0 0-3 3 3 3 0 0 0-3-3z'/%3E%3C/svg%3E");
  --ui-icon-close: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 6 6 18M6 6l12 12'/%3E%3C/svg%3E");
  --ui-icon-search: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m20.5 20.5-4.2-4.2'/%3E%3C/svg%3E");
  --ui-icon-help: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cpath d='M9.2 9.2a3 3 0 0 1 5.8 1c0 2-3 3-3 3M12 17h.01'/%3E%3C/svg%3E");
  --ui-icon-document: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M15 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V7z'/%3E%3Cpath d='M14 2v5h5M8.5 13h7M8.5 17h4'/%3E%3C/svg%3E");
  --ui-icon-alert: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M10.3 3.9 1.8 18a2 2 0 0 0 1.7 3h17a2 2 0 0 0 1.7-3L13.7 3.9a2 2 0 0 0-3.4 0z'/%3E%3Cpath d='M12 9v4M12 17h.01'/%3E%3C/svg%3E");
  --ui-icon-language: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cpath d='M3.5 9h17M3.5 15h17'/%3E%3Cpath d='M12 3a15 15 0 0 1 0 18 15 15 0 0 1 0-18z'/%3E%3C/svg%3E");
}

/* ==========================================================================
   1. PDF toolbar (floating control bar)
   ========================================================================== */

.df-container.df-floating .df-ui-wrapper.df-ui-controls {
  left: 50%;
  right: auto;
  bottom: calc(14px + env(safe-area-inset-bottom, 0px));
  width: auto;
  max-width: min(720px, calc(100vw - 24px));
  height: auto;
  padding: 6px;
  transform: translateX(-50%);

  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  gap: 2px;

  font-family: var(--ui-font);
  background: var(--ui-surface);
  -webkit-backdrop-filter: var(--ui-blur);
  backdrop-filter: var(--ui-blur);
  border: 1px solid var(--ui-line);
  border-radius: 999px;
  box-shadow: var(--ui-shadow);

  transition:
    left 0.35s var(--ui-ease),
    opacity 0.25s ease;
}

/* With the drawer open the bar recenters on the remaining space. */
.df-container.df-floating.df-sidemenu-open .df-ui-wrapper.df-ui-controls {
  left: calc(50% + (var(--ui-drawer-w) / 2));
  max-width: min(720px, calc(100vw - var(--ui-drawer-w) - 24px));
}

/* --- Toolbar buttons ------------------------------------------------ */

.df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-btn {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  padding: 0;
  margin: 0;
  float: none;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  font-size: 16px;
  line-height: 1;
  color: var(--ui-fg-dim);
  background: transparent;
  border: 0;
  border-radius: var(--ui-radius);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;

  transition:
    background-color 0.18s ease,
    color 0.18s ease,
    transform 0.18s var(--ui-ease);
}

.df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-btn:hover {
  color: var(--ui-fg);
  background: var(--ui-elevated);
}

.df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-btn:active {
  transform: scale(0.92);
}

.df-container.df-floating
  .df-ui-wrapper.df-ui-controls
  > .df-ui-btn:focus-visible {
  outline: 2px solid var(--ui-accent);
  outline-offset: 2px;
}

/* Active state: drawer open, outline open, "more" popover open */
.df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-btn.df-active {
  color: var(--ui-accent-strong);
  background: var(--ui-accent-soft);
}

.df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-btn.disabled,
.df-container.df-floating
  .df-ui-wrapper.df-ui-controls
  > .df-ui-btn.disabled:hover {
  color: var(--ui-fg-dim);
  background: transparent;
  opacity: 0.32;
  cursor: default;
  transform: none;
}

.df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-btn:before {
  position: static;
  line-height: 1;
}

/* --- Group separators ------------------------------------------------ */
/* Anchored to zoomIn and more: the only buttons always present at the group
   boundaries (outline/share/download may be set to display:none).
   The divider is a box-shadow because :before is already the themify icon. */

.df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-zoomin,
.df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-more {
  margin-left: 8px;
  box-shadow: -5px 0 0 -4px rgba(255, 255, 255, 0.16);
}

/* --- Page indicator ------------------------------------------------ */

.df-container.df-floating
  .df-ui-wrapper.df-ui-controls
  > .df-ui-btn.df-ui-page {
  width: auto;
  min-width: 66px;
  height: 34px;
  padding: 0 12px;
  margin: 0 2px;
  border-radius: 999px;
  border: 1px solid var(--ui-line-soft);
  color: var(--ui-fg);
  cursor: text;

  /* The pill doubles as a reading progress bar: script.js keeps --ui-progress
     (0 to 1) in sync with the current page. */
  background-color: rgba(255, 255, 255, 0.07);
  background-image: linear-gradient(
    90deg,
    var(--ui-accent-soft) calc(var(--ui-progress, 0) * 100%),
    rgba(255, 255, 255, 0) calc(var(--ui-progress, 0) * 100%)
  );
}

.df-container.df-floating
  .df-ui-wrapper.df-ui-controls
  > .df-ui-btn.df-ui-page:hover {
  background: var(--ui-elevated-hover);
  transform: none;
}

.df-container.df-floating .df-ui-controls .df-ui-page label {
  position: static;
  display: block;
  width: auto;
  height: auto;
  padding: 0;
  line-height: 1;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: inherit;
  white-space: nowrap;
}

.df-container.df-floating .df-ui-controls .df-ui-page input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 999px;
  background: transparent;
  font-size: 12.5px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.df-container.df-floating .df-ui-controls .df-ui-page input:focus {
  opacity: 1;
  color: var(--ui-fg);
  background: rgba(0, 0, 0, 0.35);
  outline: 2px solid var(--ui-accent);
  outline-offset: 0;
}

/* --- Tooltips (title moved to data-tip by script.js) ------------------- */

.df-container.df-floating
  .df-ui-wrapper.df-ui-controls
  > .df-ui-btn[data-tip]:after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);

  padding: 6px 10px;
  border-radius: var(--ui-radius-sm);
  background: rgba(12, 12, 14, 0.96);
  border: 1px solid var(--ui-line);
  box-shadow: var(--ui-shadow-sm);

  font-family: var(--ui-font);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--ui-fg);
  white-space: nowrap;

  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.16s ease,
    transform 0.16s var(--ui-ease);
}

.df-container.df-floating
  .df-ui-wrapper.df-ui-controls
  > .df-ui-btn[data-tip]:hover:after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* The tooltip must not cover the popover opened by the same button. */
.df-container.df-floating
  .df-ui-wrapper.df-ui-controls
  > .df-ui-btn.df-active[data-tip]:hover:after {
  opacity: 0;
}

/* --- "More" & language popovers -------------------------------------------- */

.df-container .df-ui-more .more-container,
.df-container .df-ui-search .search-container,
#lang-btn .more-container {
  right: -2px;
  margin-bottom: 14px !important;
  padding: 6px;
  min-width: 196px;
  max-width: calc(100vw - 16px);

  font-family: var(--ui-font);
  background: var(--ui-surface-strong);
  -webkit-backdrop-filter: var(--ui-blur);
  backdrop-filter: var(--ui-blur);
  border: 1px solid var(--ui-line);
  border-radius: var(--ui-radius-lg);
  box-shadow: var(--ui-shadow);
  overflow: hidden;
}

.df-container .more-container:before,
.df-container .search-container:before,
#lang-btn .more-container:before {
  border-top-color: var(--ui-surface-strong);
  right: 21px;
  bottom: -13px;
}

.df-container .more-container .df-ui-btn,
#lang-btn .more-container .df-ui-btn {
  width: 100%;
  height: 36px;
  padding: 0 10px;
  margin: 0;
  float: none;

  display: flex;
  align-items: center;
  gap: 10px;

  text-align: left;
  font-size: 12.5px;
  line-height: 1;
  color: var(--ui-fg-dim);
  background: transparent;
  border: 0;
  border-radius: var(--ui-radius-sm);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  transition:
    background-color 0.16s ease,
    color 0.16s ease;
}

.df-container .more-container .df-ui-btn:hover,
#lang-btn .more-container .df-ui-btn:hover {
  color: var(--ui-fg);
  background: var(--ui-elevated);
}

.df-container .more-container .df-ui-btn.df-active,
#lang-btn .more-container .df-ui-btn.df-active {
  color: var(--ui-accent-strong);
  background: var(--ui-accent-soft);
}

.df-container .more-container .df-ui-btn:before,
#lang-btn .more-container .df-ui-btn:before {
  position: static;
  top: auto;
  width: 18px;
  flex: 0 0 18px;
  font-size: 15px;
  text-align: center;
}

.df-container .more-container .df-ui-btn span,
#lang-btn .more-container .df-ui-btn span {
  padding-left: 0;
  font-size: 12.5px;
}

#lang-container {
  max-height: min(60vh, 420px);
  overflow-y: auto;
}

/* ==========================================================================
   2. Side navigation buttons
   ========================================================================== */

.df-container.df-floating > .df-ui-btn.df-ui-prev,
.df-container.df-floating > .df-ui-btn.df-ui-next {
  width: 46px;
  height: 46px;
  padding: 0;
  margin-top: 0;

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: 19px;
  color: var(--ui-fg);
  opacity: 0.72;

  background: var(--ui-surface);
  -webkit-backdrop-filter: var(--ui-blur);
  backdrop-filter: var(--ui-blur);
  border: 1px solid var(--ui-line);
  border-radius: 50%;
  box-shadow: var(--ui-shadow-sm);

  transition:
    opacity 0.2s ease,
    transform 0.2s var(--ui-ease),
    border-color 0.2s ease,
    background-color 0.2s ease,
    left 0.35s var(--ui-ease);
}

.df-container.df-floating > .df-ui-btn.df-ui-prev {
  left: 14px;
  right: auto;
}

.df-container.df-floating > .df-ui-btn.df-ui-next {
  right: 14px;
  left: auto;
}

.df-container.df-floating > .df-ui-btn.df-ui-prev:hover,
.df-container.df-floating > .df-ui-btn.df-ui-next:hover {
  opacity: 1;
  border-color: rgba(235, 90, 63, 0.55);
  background: var(--ui-surface-strong);
  transform: translateY(-50%) scale(1.07);
}

.df-container.df-floating > .df-ui-btn.df-ui-prev:active,
.df-container.df-floating > .df-ui-btn.df-ui-next:active {
  transform: translateY(-50%) scale(0.95);
}

.df-container.df-floating > .df-ui-btn.df-ui-prev:focus-visible,
.df-container.df-floating > .df-ui-btn.df-ui-next:focus-visible {
  outline: 2px solid var(--ui-accent);
  outline-offset: 3px;
  opacity: 1;
}

.df-container.df-floating > .df-ui-btn.df-ui-prev.disabled,
.df-container.df-floating > .df-ui-btn.df-ui-next.disabled {
  opacity: 0.22;
  pointer-events: none;
}

.df-container.df-floating.df-sidemenu-open > .df-ui-btn.df-ui-prev {
  left: calc(var(--ui-drawer-w) + 14px);
}

/* Hover hot zones on the book edges */
.df-book-wrapper .df-book-side-buttons {
  width: 52px;
  opacity: 0.45;
  border-radius: 0;
  color: #fff;
  transition:
    opacity 0.2s ease,
    background-color 0.2s ease;
}

.df-book-wrapper .df-book-side-buttons:hover {
  opacity: 1;
  background-color: transparent;
  background-image: linear-gradient(
    to left,
    rgba(0, 0, 0, 0.22),
    rgba(0, 0, 0, 0)
  );
}

.df-book-wrapper .df-book-prev-button.df-book-side-buttons:hover {
  background-image: linear-gradient(
    to right,
    rgba(0, 0, 0, 0.22),
    rgba(0, 0, 0, 0)
  );
}

.df-book-wrapper .df-book-side-buttons:before {
  font-size: 26px;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.6);
}

/* ==========================================================================
   3. Side drawer (page thumbnails / outline)
   ========================================================================== */

.df-container .df-sidemenu {
  width: var(--ui-drawer-w);
  left: 0;
  font-family: var(--ui-font);
  background: var(--ui-surface-strong);
  -webkit-backdrop-filter: var(--ui-blur);
  backdrop-filter: var(--ui-blur);
  border-right: 1px solid var(--ui-line);
  box-shadow: 8px 0 32px rgba(0, 0, 0, 0.45);
  transform: translateX(-100%);
  transition: transform 0.38s var(--ui-ease);
}

.df-container .df-sidemenu.df-sidemenu-visible {
  transform: translateX(0);
}

/* Heading: the label comes from script.js through a custom property. */
.df-container .df-sidemenu:before {
  content: var(--ui-drawer-title, "Pages");
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: var(--ui-drawer-head);
  z-index: 2;

  display: flex;
  align-items: center;
  padding: 0 16px;

  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ui-fg-dim);

  background: rgba(255, 255, 255, 0.035);
  border-bottom: 1px solid var(--ui-line);
}

.df-container .df-outline-container.df-sidemenu:before {
  content: var(--ui-outline-title, "Contents");
}

.df-container .df-thumb-wrapper,
.df-container .df-outline-wrapper {
  top: var(--ui-drawer-head) !important;
  bottom: 0;
  margin-bottom: 0;
  box-shadow: none;
  overflow-y: auto;
  overscroll-behavior: contain;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.22) transparent;
}

.df-container .df-thumb-wrapper::-webkit-scrollbar,
.df-container .df-outline-wrapper::-webkit-scrollbar {
  width: 8px;
}

.df-container .df-thumb-wrapper::-webkit-scrollbar-thumb,
.df-container .df-outline-wrapper::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.18);
  border: 2px solid transparent;
  background-clip: content-box;
  border-radius: 999px;
}

.df-container .df-thumb-wrapper::-webkit-scrollbar-thumb:hover,
.df-container .df-outline-wrapper::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.32);
  background-clip: content-box;
}

/* --- Thumbnails ----------------------------------------------------------- */
/* NOTE: the virtual list pins the row pitch to 128px (itemHeight), so
   height + vertical margins must keep adding up to 128px. */

.df-container .df-thumb-container .df-vrow {
  width: calc(100% - 28px);
  height: 118px;
  margin: 5px auto;
  padding-bottom: 22px;
  box-sizing: border-box;

  background-color: rgba(255, 255, 255, 0.05);
  background-origin: content-box;
  border: 1px solid transparent;
  border-radius: var(--ui-radius-sm);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);

  transition:
    background-color 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease;
}

.df-container.df-floating .df-thumb-container .df-vrow:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.22);
}

.df-container .df-thumb-container .df-vrow.df-selected,
.df-container.df-floating .df-thumb-container .df-vrow.df-selected:hover {
  background-color: var(--ui-accent-soft);
  border-color: var(--ui-accent);
  box-shadow:
    0 0 0 1px rgba(235, 90, 63, 0.45),
    0 4px 16px rgba(0, 0, 0, 0.4);
}

/* Thumbnail loading spinner, centered */
.df-container .df-thumb-container .df-vrow:before {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: 0;
  transform: translate(-50%, -50%);
  opacity: 0.55;
}

/* Page number badge */
.df-container .df-thumb-container .df-vrow > div {
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);

  width: auto;
  min-width: 28px;
  height: 18px;
  padding: 0 7px;
  margin: 0;

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: 10.5px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ui-fg);

  background: rgba(0, 0, 0, 0.6);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  transition:
    background-color 0.18s ease,
    border-color 0.18s ease;
}

.df-container .df-thumb-container .df-vrow.df-selected > div {
  background: var(--ui-accent);
  border-color: transparent;
  color: #fff;
}

/* --- Outline / bookmarks -------------------------------------------------- */

.df-container .df-outline-container {
  color: var(--ui-fg-dim);
  font-size: 12.5px;
}

.df-container .df-outline-wrapper {
  padding: 10px 8px 20px;
}

.df-container .df-outline-item a {
  padding: 7px 10px;
  border-radius: var(--ui-radius-sm);
  color: var(--ui-fg-dim) !important;
  line-height: 1.35;
}

.df-container .df-outline-item a:hover,
.df-container .df-outline-toggle:hover {
  color: var(--ui-fg) !important;
  background-color: var(--ui-elevated);
  border-radius: var(--ui-radius-sm);
}

.df-container .df-outline-toggle {
  color: var(--ui-fg-dim);
  border-radius: 4px;
}

/* --- Drawer close button -------------------------------------- */

.df-container .df-sidemenu .df-ui-btn.df-ui-sidemenu-close {
  top: 8px;
  right: -38px;
  width: 38px;
  height: 38px;
  padding: 0;

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: 13px;
  color: var(--ui-fg-dim);
  background: var(--ui-surface-strong);
  -webkit-backdrop-filter: var(--ui-blur);
  backdrop-filter: var(--ui-blur);
  border: 1px solid var(--ui-line);
  border-left: 0;
  border-radius: 0 var(--ui-radius) var(--ui-radius) 0;
  box-shadow: var(--ui-shadow-sm);
  transition:
    background-color 0.18s ease,
    color 0.18s ease;
}

.df-container .df-sidemenu .df-ui-btn.df-ui-sidemenu-close:hover {
  color: #fff;
  background: var(--ui-accent);
  border-color: transparent;
}

/* ==========================================================================
   4. Loading states & screens
   The library ships an animated GIF for both the page and the thumbnail
   spinners; a CSS ring is sharp at any density and follows the accent colour.
   ========================================================================== */

@keyframes ui-spin {
  to {
    transform: rotate(360deg);
  }
}

.df-container .df-page-loading:before {
  width: 38px;
  height: 38px;
  margin: -19px;
  background-color: transparent;
  border: 3px solid rgba(120, 120, 130, 0.22);
  border-radius: 50%;
}

.df-container .df-page-loading:after {
  width: 38px;
  height: 38px;
  margin: -19px;
  background-image: none;
  border: 3px solid transparent;
  border-top-color: var(--ui-accent);
  border-radius: 50%;
  animation: ui-spin 0.7s linear infinite;
}

.df-container .df-thumb-container .df-vrow:before {
  width: 20px;
  height: 20px;
  background-image: none;
  border: 2px solid rgba(255, 255, 255, 0.16);
  border-top-color: var(--ui-accent);
  border-radius: 50%;
  opacity: 1;
  animation: ui-spin 0.7s linear infinite;
}

/* Message screens (no document, load failure) rendered by script.js. */
.ui-screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 24px;
  text-align: center;
  font-family: var(--ui-font);
  color: var(--ui-fg);
  background: #16161a;
}

.ui-screen__icon {
  width: 52px;
  height: 52px;
  background-color: var(--ui-fg-dim);
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-image: var(--ui-icon-document);
  mask-image: var(--ui-icon-document);
}

.ui-screen--error .ui-screen__icon {
  background-color: var(--ui-accent);
  -webkit-mask-image: var(--ui-icon-alert);
  mask-image: var(--ui-icon-alert);
}

.ui-screen__title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.ui-screen__text {
  margin: 0;
  max-width: 34ch;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--ui-fg-dim);
}

.ui-screen__action {
  margin-top: 4px;
  padding: 9px 18px;
  font: inherit;
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--ui-fg);
  background: var(--ui-elevated);
  border: 1px solid var(--ui-line);
  border-radius: 999px;
  cursor: pointer;
  transition:
    background-color 0.18s ease,
    border-color 0.18s ease;
}

.ui-screen__action:hover {
  background: var(--ui-elevated-hover);
  border-color: rgba(235, 90, 63, 0.5);
}

.ui-screen__action:focus-visible {
  outline: 2px solid var(--ui-accent);
  outline-offset: 2px;
}

/* ==========================================================================
   5. Icons
   The themify icon font is replaced by inline SVG shapes drawn through a CSS
   mask, so every glyph shares one stroke weight and takes its colour from the
   button (hover, active, disabled) instead of carrying its own.
   The library keeps assigning ti-* classes, so these hook onto those names.
   ========================================================================== */

.df-container .df-ui-btn[class*="ti-"]:before,
.df-container .df-book-side-buttons[class*="ti-"]:before {
  content: "";
  display: block;
  width: 20px;
  height: 20px;
  font-size: 0;
  background-color: currentColor;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-size: contain;
  mask-size: contain;
}

.df-container .df-ui-btn.ti-angle-left:before {
  -webkit-mask-image: var(--ui-icon-prev);
  mask-image: var(--ui-icon-prev);
}

.df-container .df-ui-btn.ti-angle-right:before {
  -webkit-mask-image: var(--ui-icon-next);
  mask-image: var(--ui-icon-next);
}

.df-container .df-ui-btn.ti-angle-double-left:before {
  -webkit-mask-image: var(--ui-icon-first);
  mask-image: var(--ui-icon-first);
}

.df-container .df-ui-btn.ti-angle-double-right:before {
  -webkit-mask-image: var(--ui-icon-last);
  mask-image: var(--ui-icon-last);
}

.df-container .df-ui-btn.ti-menu-alt:before {
  -webkit-mask-image: var(--ui-icon-outline);
  mask-image: var(--ui-icon-outline);
}

.df-container .df-ui-btn.ti-layout-grid2:before {
  -webkit-mask-image: var(--ui-icon-thumbnails);
  mask-image: var(--ui-icon-thumbnails);
}

.df-container .df-ui-btn.ti-zoom-in:before {
  -webkit-mask-image: var(--ui-icon-zoom-in);
  mask-image: var(--ui-icon-zoom-in);
}

.df-container .df-ui-btn.ti-zoom-out:before {
  -webkit-mask-image: var(--ui-icon-zoom-out);
  mask-image: var(--ui-icon-zoom-out);
}

.df-container .df-ui-btn.ti-fullscreen:before {
  -webkit-mask-image: var(--ui-icon-fullscreen);
  mask-image: var(--ui-icon-fullscreen);
}

.df-container .df-ui-btn.ti-arrows-corner:before {
  -webkit-mask-image: var(--ui-icon-exit-fullscreen);
  mask-image: var(--ui-icon-exit-fullscreen);
}

.df-container .df-ui-btn.ti-share-alt:before {
  -webkit-mask-image: var(--ui-icon-share);
  mask-image: var(--ui-icon-share);
}

.df-container .df-ui-btn.ti-download:before {
  -webkit-mask-image: var(--ui-icon-download);
  mask-image: var(--ui-icon-download);
}

.df-container .df-ui-btn.ti-volume:before {
  -webkit-mask-image: var(--ui-icon-sound-on);
  mask-image: var(--ui-icon-sound-on);
}

/* The library marks a muted book as disabled rather than swapping the icon. */
.df-container .df-ui-btn.ti-volume.disabled:before {
  -webkit-mask-image: var(--ui-icon-sound-off);
  mask-image: var(--ui-icon-sound-off);
}

.df-container .df-ui-btn.ti-more-alt:before {
  -webkit-mask-image: var(--ui-icon-more);
  mask-image: var(--ui-icon-more);
}

.df-container .df-ui-btn.ti-file:before {
  -webkit-mask-image: var(--ui-icon-single-page);
  mask-image: var(--ui-icon-single-page);
}

.df-container .df-ui-btn.ti-book:before {
  -webkit-mask-image: var(--ui-icon-double-page);
  mask-image: var(--ui-icon-double-page);
}

.df-container .df-ui-btn.ti-close:before {
  -webkit-mask-image: var(--ui-icon-close);
  mask-image: var(--ui-icon-close);
}

.df-container .df-ui-btn.ti-search:before {
  -webkit-mask-image: var(--ui-icon-search);
  mask-image: var(--ui-icon-search);
}

.df-container .df-ui-btn.ti-help-alt:before {
  -webkit-mask-image: var(--ui-icon-help);
  mask-image: var(--ui-icon-help);
}

#lang-btn.df-ui-btn.ti-world:before {
  content: "";
  display: block;
  width: 20px;
  height: 20px;
  font-size: 0;
  background-color: currentColor;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-image: var(--ui-icon-language);
  mask-image: var(--ui-icon-language);
}

/* Sizes per context: popover rows and the drawer close button read better a
   little smaller, the big side arrows a little larger. */
.df-container .more-container .df-ui-btn[class*="ti-"]:before,
#lang-btn .more-container .df-ui-btn[class*="ti-"]:before {
  width: 17px;
  height: 17px;
}

.df-container .df-sidemenu .df-ui-btn.df-ui-sidemenu-close:before {
  width: 15px;
  height: 15px;
}

.df-container.df-floating > .df-ui-btn.df-ui-prev:before,
.df-container.df-floating > .df-ui-btn.df-ui-next:before {
  width: 22px;
  height: 22px;
}

.df-book-wrapper .df-book-side-buttons:before {
  width: 26px;
  height: 26px;
  margin: -13px 0 0 -13px;
  filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.55));
}

/* ==========================================================================
   6. Responsive
   ========================================================================== */

@media (max-width: 640px) {
  :root {
    --ui-drawer-w: 190px;
  }

  .df-container.df-floating .df-ui-wrapper.df-ui-controls {
    bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    max-width: calc(100vw - 16px);
    padding: 5px;
    border-radius: 20px;
  }

  /* On narrow screens buttons may shrink instead of overflowing the pill,
     so the bar always stays fully visible. */
  .df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-btn {
    flex: 0 1 auto;
    width: 36px;
    min-width: 30px;
    height: 36px;
    font-size: 15px;
  }

  .df-container.df-floating
    .df-ui-wrapper.df-ui-controls
    > .df-ui-btn.df-ui-page {
    flex: 0 0 auto;
    height: 32px;
    min-width: 60px;
    padding: 0 10px;
  }

  .df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-zoomin,
  .df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-zoomout {
    display: none;
  }

  .df-container.df-floating.df-sidemenu-open .df-ui-wrapper.df-ui-controls {
    left: 50%;
    max-width: calc(100vw - 16px);
  }

  .df-container.df-floating > .df-ui-btn.df-ui-prev,
  .df-container.df-floating > .df-ui-btn.df-ui-next {
    width: 40px;
    height: 40px;
    font-size: 17px;
  }

  .df-container.df-floating
    .df-ui-wrapper.df-ui-controls
    > .df-ui-btn[data-tip]:hover:after {
    opacity: 0;
  }
}

.df-container.df-xs.df-floating .df-ui-controls > .df-ui-btn.df-ui-zoomin,
.df-container.df-xs.df-floating .df-ui-controls > .df-ui-btn.df-ui-zoomout {
  display: none;
}

/* ==========================================================================
   7. Accessibility
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .df-container .df-thumb-wrapper,
  .df-container .df-outline-wrapper {
    scroll-behavior: auto;
  }

  .df-container .df-page-loading:after,
  .df-container .df-thumb-container .df-vrow:before {
    animation-duration: 1.8s;
  }

  .df-container .df-sidemenu,
  .df-container.df-floating .df-ui-wrapper.df-ui-controls,
  .df-container.df-floating > .df-ui-btn.df-ui-prev,
  .df-container.df-floating > .df-ui-btn.df-ui-next,
  .df-container .df-thumb-container .df-vrow,
  .df-container.df-floating .df-ui-wrapper.df-ui-controls > .df-ui-btn {
    transition-duration: 0.01ms !important;
  }
}