/* Shared reader: theme tokens in WordPress, system-font fallbacks standalone. */
.fb-viewer {
    --fb-paper: var(--color-surface, #fffdf9);
    --fb-bg: var(--color-background, #f7f2ea);
    --fb-ink: var(--color-foreground, #241913);
    --fb-accent: var(--color-accent-hover, #5b2f13);
    --fb-border: #a39789;
    box-sizing: border-box;
    position: relative;
    width: 100%;
    max-width: 100%;
    margin: 2rem auto;
    padding: clamp(.75rem, 2vw, 1.5rem);
    border: 1px solid var(--fb-border);
    background: var(--fb-bg);
    color: var(--fb-ink);
    font: 1rem/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
    overflow: hidden;
}
.fb-viewer *, .fb-viewer *::before, .fb-viewer *::after { box-sizing: border-box; }
.fb-viewer [hidden] { display: none !important; }
.fb-heading { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: center; justify-content: space-between; margin-bottom: .75rem; }
.fb-title { margin: 0; font-family: var(--font-heading, Georgia, serif); font-size: 1.375rem; font-weight: 400; }
.fb-status { margin: 0; font-size: .8125rem; }
.fb-stage { position: relative; width: 100%; height: clamp(22rem, 66vh, 46rem); overflow: hidden; background: var(--color-beige-light, #e7ded1); border: 1px solid var(--fb-border); }
.fb-book { position: relative; width: 100% !important; height: 100% !important; min-width: 0 !important; min-height: 0 !important; max-width: none !important; }
.fb-page { background: var(--fb-paper); overflow: hidden; box-shadow: 0 0 .65rem rgb(36 25 19 / .13); }
.fb-page img { display: block; width: 100%; height: 100%; max-width: none; object-fit: contain; }
.fb-placeholder { position: absolute; inset: 0; display: grid; place-items: center; padding: 1rem; background: var(--fb-paper); color: var(--fb-ink); font-size: .875rem; text-align: center; }
.fb-placeholder::before { content: ""; width: 1.5rem; height: 1.5rem; border: 2px solid #c6bbaa; border-top-color: var(--fb-accent); border-radius: 50%; animation: fb-spin 1s linear infinite; }
.fb-page[data-state="ready"] .fb-placeholder { display: none; }
.fb-page[data-state="error"] .fb-placeholder::before { display: none; }
.fb-controls { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; justify-content: center; margin-top: 1rem; }
.fb-viewer button, .fb-viewer input {
    min-height: 2.75rem; min-width: 2.75rem; margin: 0; border: 1px solid var(--fb-accent);
    border-radius: 2px; background: var(--fb-paper); color: var(--fb-accent); font: inherit;
    font-size: .875rem; line-height: 1.25; padding: .625rem .875rem;
}
.fb-viewer button { cursor: pointer; touch-action: manipulation; }
.fb-viewer button:hover:not(:disabled) { background: var(--fb-accent); color: #fffdf9; }
.fb-viewer button:disabled { opacity: .5; cursor: default; }
.fb-viewer :focus-visible { outline: 3px solid var(--fb-accent); outline-offset: 3px; }
.fb-viewer:focus-visible { outline-offset: 0; }
.fb-counter { min-width: 11rem; text-align: center; font-variant-numeric: tabular-nums; }
.fb-jump { display: flex; gap: .5rem; margin: 0; }
.fb-jump input { width: 5.5rem; }
.fb-tools { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: center; }
.fb-zoom-status { min-width: 3.5rem; align-self: center; text-align: center; font-size: .875rem; }
.fb-help { margin: .75rem 0 0; text-align: center; font-size: .8125rem; }
.fb-reading { position: absolute; inset: 0; overflow: auto; overscroll-behavior: contain; touch-action: pan-x pan-y pinch-zoom; background: var(--color-beige-light, #e7ded1); cursor: grab; }
.fb-reading:active { cursor: grabbing; }
.fb-reading-sheet { min-width: 100%; min-height: 100%; display: grid; place-items: center; }
.fb-reading-image { display: block; max-width: none !important; height: auto; background: var(--fb-paper); }
.fb-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; clip-path: inset(50%); white-space: nowrap; overflow: hidden; }
.fb-viewer:fullscreen, .fb-viewer.fb-expanded { width: 100%; max-width: none; height: 100%; margin: 0; border: 0; display: flex; flex-direction: column; padding: max(.75rem, env(safe-area-inset-top)) max(.75rem, env(safe-area-inset-right)) max(.75rem, env(safe-area-inset-bottom)) max(.75rem, env(safe-area-inset-left)); }
.fb-viewer:fullscreen .fb-stage, .fb-expanded .fb-stage { flex: 1; min-height: 0; height: auto; }
.fb-viewer:fullscreen::backdrop { background: var(--color-beige-light, #e7ded1); }
.fb-standalone { margin: 0; background: #f7f2ea; color: #241913; font: 1rem/1.5 system-ui, sans-serif; }
.fb-standalone main { width: min(calc(100% - 2rem), 78rem); margin: 2rem auto; }
.fb-standalone h1 { margin: 0 0 .5rem; font: 400 clamp(2rem, 5vw, 3rem)/1.15 Georgia, serif; }
.fb-standalone .fb-viewer { margin-top: 1.25rem; }
@media (max-width: 40rem) {
    .fb-stage { height: min(68svh, 38rem); min-height: 19rem; }
    .fb-controls { gap: .5rem; }
    .fb-counter { min-width: 8.75rem; font-size: .875rem; }
    .fb-tools { flex-basis: 100%; }
    .fb-jump { flex-basis: 100%; justify-content: center; }
    .fb-help { font-size: .75rem; }
}
@keyframes fb-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
    .fb-placeholder::before { animation: none; }
    .fb-viewer *, .fb-viewer *::before, .fb-viewer *::after { scroll-behavior: auto !important; transition: none !important; }
}