/* ━━━ FlipForge Viewer Styles ━━━ */

/* ── Viewer Container ── */
.viewer {
  width: 100%; height: 100vh; display: flex; flex-direction: column;
  background: var(--bg-elevated); overflow: hidden; position: relative;
  user-select: none;
}

/* ── Viewer Toolbar ── */
.viewer-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  height: 48px; padding: 0 12px; background: var(--bg);
  border-bottom: 1px solid var(--border); flex-shrink: 0; z-index: 10;
}
.viewer-toolbar__left { display: flex; align-items: center; gap: 8px; }
.viewer-toolbar__logo { display: flex; align-items: center; gap: 6px; font-weight: 600; font-size: 0.85rem; color: var(--fg); }
.viewer-toolbar__logo svg { width: 18px; height: 18px; }
.viewer-toolbar__title { font-size: 0.85rem; color: var(--fg-muted); max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.viewer-toolbar__center { display: flex; align-items: center; gap: 8px; }
.viewer-toolbar__right { display: flex; align-items: center; gap: 4px; }
.viewer-toolbar__btn {
  width: 34px; height: 34px; display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); color: var(--fg-muted); transition: all 0.2s;
  position: relative;
}
.viewer-toolbar__btn:hover { background: var(--bg-surface); color: var(--fg); }
.viewer-toolbar__btn.is-active { background: var(--brand-light); color: var(--brand); }
.viewer-toolbar__btn svg { width: 18px; height: 18px; }
.viewer-toolbar__page-info { font-size: 0.8rem; font-weight: 500; color: var(--fg-muted); min-width: 50px; text-align: center; }
.viewer-toolbar__sep { width: 1px; height: 20px; background: var(--border); margin: 0 4px; }

/* ── Viewer Canvas ── */
.viewer-canvas {
  flex: 1; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden; perspective: 2000px;
}

/* ── Flipbook Container ── */
.flipbook {
  position: relative; transform-style: preserve-3d;
  transition: transform 0.3s var(--ease-out);
}
.flipbook.is-double { display: flex; }

/* ── Page ── */
.flipbook__page {
  position: relative; background: #fff; overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
  transform-style: preserve-3d;
}
.flipbook__page canvas { width: 100%; height: 100%; display: block; }
.flipbook__page-content { position: absolute; inset: 0; }

/* Page flip animation */
.flipbook__page.is-flipping-forward {
  animation: flipForward var(--flip-speed) var(--ease-out) forwards;
  transform-origin: left center;
}
.flipbook__page.is-flipping-backward {
  animation: flipBackward var(--flip-speed) var(--ease-out) forwards;
  transform-origin: right center;
}
@keyframes flipForward {
  0% { transform: rotateY(0deg); }
  100% { transform: rotateY(-180deg); }
}
@keyframes flipBackward {
  0% { transform: rotateY(-180deg); }
  100% { transform: rotateY(0deg); }
}

/* Page shadow overlay during flip */
.flipbook__page-shadow {
  position: absolute; inset: 0; pointer-events: none; opacity: 0;
  transition: opacity 0.3s;
}
.flipbook__page.is-flipping-forward .flipbook__page-shadow {
  background: linear-gradient(to left, rgba(0,0,0,0.15), transparent 80%);
  opacity: 1;
}

/* Page curl effect */
.flipbook__page-curl {
  position: absolute; top: 0; right: 0; width: 40px; height: 40px;
  background: linear-gradient(135deg, transparent 50%, rgba(0,0,0,0.05) 50%);
  cursor: pointer; opacity: 0; transition: opacity 0.3s;
}
.flipbook__page:hover .flipbook__page-curl { opacity: 1; }

/* ── Navigation Arrows ── */
.viewer-nav {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 5;
  width: 44px; height: 80px; display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.85); backdrop-filter: blur(4px);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  color: var(--fg-muted); cursor: pointer; transition: all 0.25s var(--ease-out);
  opacity: 0;
}
.viewer-canvas:hover .viewer-nav { opacity: 1; }
.viewer-nav:hover { background: var(--bg); color: var(--fg); box-shadow: var(--shadow-md); }
.viewer-nav svg { width: 22px; height: 22px; }
.viewer-nav--prev { left: 16px; }
.viewer-nav--next { right: 16px; }
.viewer-nav:disabled { opacity: 0.3; cursor: default; }
[data-theme="dark"] .viewer-nav { background: rgba(30,30,40,0.85); }

/* ── TOC Sidebar ── */
.viewer-toc {
  position: absolute; left: 0; top: 0; bottom: 0; width: 280px; z-index: 15;
  background: var(--bg); border-right: 1px solid var(--border); box-shadow: var(--shadow-lg);
  transform: translateX(-100%); transition: transform 0.35s var(--ease-out);
  display: flex; flex-direction: column;
}
.viewer-toc.is-open { transform: translateX(0); }
.viewer-toc__header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; border-bottom: 1px solid var(--border);
  font-size: 0.9rem; font-weight: 600;
}
.viewer-toc__list { flex: 1; overflow-y: auto; padding: 8px; }
.viewer-toc__item {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border-radius: var(--radius-sm); font-size: 0.85rem; color: var(--fg-muted);
  cursor: pointer; transition: all 0.2s;
}
.viewer-toc__item:hover { background: var(--bg-surface); color: var(--fg); }
.viewer-toc__item.is-active { background: var(--brand-light); color: var(--brand); font-weight: 500; }
.viewer-toc__item-num { font-size: 0.75rem; color: var(--fg-subtle); min-width: 24px; }

/* ── Thumbnails Strip ── */
.viewer-thumbs {
  position: absolute; bottom: 0; left: 0; right: 0; z-index: 15;
  background: var(--bg); border-top: 1px solid var(--border);
  box-shadow: 0 -4px 16px rgba(0,0,0,0.1);
  transform: translateY(100%); transition: transform 0.35s var(--ease-out);
  padding: 12px;
}
.viewer-thumbs.is-open { transform: translateY(0); }
.viewer-thumbs__list {
  display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px;
  scroll-snap-type: x mandatory;
}
.viewer-thumbs__item {
  flex-shrink: 0; width: 80px; aspect-ratio: 3/4; border-radius: var(--radius-sm);
  border: 2px solid var(--border); overflow: hidden; cursor: pointer;
  transition: all 0.2s; scroll-snap-align: start;
}
.viewer-thumbs__item:hover { border-color: var(--brand); }
.viewer-thumbs__item.is-active { border-color: var(--brand); box-shadow: 0 0 0 2px var(--brand-glow); }
.viewer-thumbs__item canvas, .viewer-thumbs__item img { width: 100%; height: 100%; object-fit: cover; }

/* ── Search Panel ── */
.viewer-search {
  position: absolute; top: 0; right: 0; width: 320px; height: 100%; z-index: 15;
  background: var(--bg); border-left: 1px solid var(--border); box-shadow: var(--shadow-lg);
  transform: translateX(100%); transition: transform 0.35s var(--ease-out);
  display: flex; flex-direction: column;
}
.viewer-search.is-open { transform: translateX(0); }
.viewer-search__header { padding: 12px; border-bottom: 1px solid var(--border); }
.viewer-search__input-wrap { display: flex; gap: 6px; }
.viewer-search__results { flex: 1; overflow-y: auto; padding: 8px; }
.viewer-search__result {
  padding: 10px 12px; border-radius: var(--radius-sm); cursor: pointer;
  transition: background 0.2s; border-bottom: 1px solid var(--border);
}
.viewer-search__result:hover { background: var(--bg-surface); }
.viewer-search__result-page { font-size: 0.75rem; color: var(--brand); font-weight: 600; }
.viewer-search__result-text { font-size: 0.8rem; color: var(--fg-muted); margin-top: 2px; }
.viewer-search__result-text mark { background: var(--brand-light); color: var(--brand); padding: 0 2px; border-radius: 2px; }

/* ── Annotations Layer ── */
.annotations-layer { position: absolute; inset: 0; pointer-events: none; z-index: 3; }
.annotations-layer.is-active { pointer-events: all; cursor: crosshair; }
.annotation {
  position: absolute; z-index: 4;
}
.annotation--note {
  width: 32px; height: 32px; background: #fbbf24; border-radius: 4px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.7rem; font-weight: 700; color: #92400e;
}
.annotation--highlight {
  background: rgba(251,191,36,0.3); border-radius: 2px; min-height: 20px;
}
.annotation__popup {
  position: absolute; bottom: calc(100% + 8px); left: 0; width: 200px;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg); padding: 10px; font-size: 0.8rem;
  display: none;
}
.annotation.is-open .annotation__popup { display: block; }

/* ── Annotation Toolbar ── */
.annotation-toolbar {
  position: absolute; bottom: 16px; left: 50%; transform: translateX(-50%); z-index: 20;
  display: flex; align-items: center; gap: 4px; padding: 6px;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); display: none;
}
.annotation-toolbar.is-visible { display: flex; }
.annotation-toolbar__btn {
  width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); color: var(--fg-muted); transition: all 0.2s;
}
.annotation-toolbar__btn:hover { background: var(--bg-surface); color: var(--fg); }
.annotation-toolbar__btn.is-active { background: var(--brand-light); color: var(--brand); }

/* ── Watermark Layer ── */
.watermark-layer {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  pointer-events: none; z-index: 2; overflow: hidden;
}
.watermark-layer__text {
  font-size: 4rem; font-weight: 700; color: rgba(0,0,0,0.06);
  transform: rotate(-30deg); white-space: nowrap; letter-spacing: 0.1em;
  text-transform: uppercase;
}
[data-theme="dark"] .watermark-layer__text { color: rgba(255,255,255,0.04); }

/* ── Zoom Controls ── */
.viewer-zoom {
  position: absolute; bottom: 16px; right: 16px; z-index: 10;
  display: flex; flex-direction: column; gap: 2px;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-md);
  box-shadow: var(--shadow-md); overflow: hidden;
}
.viewer-zoom__btn {
  width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
  color: var(--fg-muted); transition: all 0.2s; border-bottom: 1px solid var(--border);
}
.viewer-zoom__btn:last-child { border-bottom: none; }
.viewer-zoom__btn:hover { background: var(--bg-surface); color: var(--fg); }
.viewer-zoom__btn svg { width: 16px; height: 16px; }

/* ── Fullscreen ── */
.viewer.is-fullscreen { position: fixed; inset: 0; z-index: 9999; }
.viewer.is-fullscreen .viewer-toolbar { background: rgba(0,0,0,0.9); border: none; }
.viewer.is-fullscreen .viewer-toolbar * { color: #fff; }
.viewer.is-fullscreen .viewer-canvas { background: #111; }
.viewer.is-fullscreen .viewer-nav { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.1); color: #fff; }
.viewer.is-fullscreen .viewer-nav:hover { background: rgba(255,255,255,0.2); }

/* ── Loading State ── */
.viewer-loading {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 16px;
  background: var(--bg); z-index: 20;
}
.viewer-loading__text { font-size: 0.9rem; color: var(--fg-muted); }
.viewer-loading__bar {
  width: 200px; height: 3px; background: var(--bg-elevated); border-radius: 2px; overflow: hidden;
}
.viewer-loading__bar-fill {
  height: 100%; background: var(--brand); border-radius: 2px;
  transition: width 0.3s; width: 0;
}

/* ── Mobile Bottom Bar ── */
@media (max-width: 768px) {
  .viewer-toolbar { height: 42px; padding: 0 8px; }
  .viewer-toolbar__title { display: none; }
  .viewer-toolbar__btn { width: 32px; height: 32px; }
  .viewer-toolbar__btn svg { width: 16px; height: 16px; }
  .viewer-nav { width: 36px; height: 60px; }
  .viewer-nav--prev { left: 4px; }
  .viewer-nav--next { right: 4px; }
  .viewer-nav { opacity: 0.6; }
  .viewer-toc { width: 260px; }
  .viewer-search { width: 100%; }
  .viewer-thumbs__item { width: 60px; }
}

/* ── Print styles ── */
@media print {
  .viewer-toolbar, .viewer-nav, .viewer-zoom, .viewer-toc, .viewer-thumbs, .viewer-search,
  .annotation-toolbar, .watermark-layer { display: none !important; }
  .viewer-canvas { background: #fff; }
  .flipbook__page { box-shadow: none; page-break-after: always; }
}