/* ============================================================
   Rex Flipbook v2 — Frontend Styles
   ============================================================ */

.rex-fb-wrap{
    /* Default (Dark) theme tokens */
    --rex-fb-bg:        #1a1a1a;
    --rex-fb-bg2:       #0f0f0f;
    --rex-fb-fg:        #f5f5f5;
    --rex-fb-fg-dim:    rgba(245,245,245,.6);
    --rex-fb-accent:    #00a9ce;
    --rex-fb-toolbar:   rgba(20,20,20,.72);
    --rex-fb-border:    rgba(255,255,255,.10);
    --rex-fb-btn-hover: rgba(255,255,255,.10);
    --rex-fb-sidebar:   rgba(15,15,15,.96);
    --rex-fb-shadow:    0 18px 50px rgba(0,0,0,.55);
    --rex-fb-page-bg:   #fff;

    position: relative;
    width: 100%;
    max-width: 100%;
    min-height: 480px;
    background: linear-gradient(135deg, var(--rex-fb-bg) 0%, var(--rex-fb-bg2) 100%);
    border-radius: 12px;
    overflow: hidden;
    color: var(--rex-fb-fg);
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
    box-shadow: 0 10px 40px rgba(0,0,0,.12), 0 2px 8px rgba(0,0,0,.06);
    outline: none;
    isolation: isolate;
}

/* Theme: Light */
.rex-fb-theme-light{
    --rex-fb-bg:        #f4f5f7;
    --rex-fb-bg2:       #e6e8ed;
    --rex-fb-fg:        #1f2937;
    --rex-fb-fg-dim:    rgba(31,41,55,.6);
    --rex-fb-toolbar:   rgba(255,255,255,.78);
    --rex-fb-border:    rgba(0,0,0,.08);
    --rex-fb-btn-hover: rgba(0,0,0,.06);
    --rex-fb-sidebar:   rgba(255,255,255,.98);
    --rex-fb-shadow:    0 18px 50px rgba(0,0,0,.18);
}

/* Theme: Sepia */
.rex-fb-theme-sepia{
    --rex-fb-bg:        #f5ecd9;
    --rex-fb-bg2:       #e8d8b3;
    --rex-fb-fg:        #4a3a26;
    --rex-fb-fg-dim:    rgba(74,58,38,.65);
    --rex-fb-accent:    #b07a2d;
    --rex-fb-toolbar:   rgba(245,236,217,.85);
    --rex-fb-border:    rgba(74,58,38,.15);
    --rex-fb-btn-hover: rgba(74,58,38,.08);
    --rex-fb-sidebar:   rgba(245,236,217,.98);
    --rex-fb-shadow:    0 18px 50px rgba(74,58,38,.25);
}

/* Theme: Custom (uses bg from inline style) */
.rex-fb-theme-custom{ /* tokens come from inline style */ }

/* Background image overlay */
.rex-fb-has-bgimg{
    background: var(--rex-fb-bgimg) center/cover no-repeat;
}
.rex-fb-has-bgimg::before{
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(0,0,0,.4), rgba(0,0,0,.7));
    z-index: 0;
}

/* ---------- Toolbar (Glassmorphism) ---------- */
.rex-fb-toolbar{
    position: relative;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 14px;
    background: var(--rex-fb-toolbar);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    border-bottom: 1px solid var(--rex-fb-border);
}
.rex-fb-toolbar-left,
.rex-fb-toolbar-center,
.rex-fb-toolbar-right{
    display: flex; align-items: center; gap: 4px;
}
.rex-fb-toolbar-center{ flex: 0 1 auto; }

.rex-fb-btn{
    appearance: none;
    background: transparent;
    color: var(--rex-fb-fg);
    border: none;
    border-radius: 8px;
    width: 38px;
    height: 38px;
    padding: 0;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background .18s, color .18s, transform .12s;
    flex-shrink: 0;
}
.rex-fb-btn svg{ width: 20px; height: 20px; display: block; }
.rex-fb-btn:hover{ background: var(--rex-fb-btn-hover); }
.rex-fb-btn:active{ transform: scale(0.94); }
.rex-fb-btn:focus-visible{ outline: 2px solid var(--rex-fb-accent); outline-offset: 2px; }
.rex-fb-btn-sm{ width: 32px; height: 32px; opacity: .75; }
.rex-fb-btn-sm svg{ width: 16px; height: 16px; }
.rex-fb-btn-sm:hover{ opacity: 1; }

/* Sound button state */
.rex-fb-btn[data-action="sound"]:not(.rex-fb-sound-on) .rex-fb-sound-wave{ display: none; }
.rex-fb-btn[data-action="sound"]:not(.rex-fb-sound-on){ opacity: .55; }
.rex-fb-btn[data-action="sound"]:not(.rex-fb-sound-on)::after{
    content: '';
    position: absolute;
    width: 22px; height: 2px;
    background: currentColor;
    transform: rotate(-45deg);
    border-radius: 2px;
}
.rex-fb-btn[data-action="sound"]{ position: relative; }

/* Play / pause toggle */
.rex-fb-btn[data-action="play"].is-playing{
    color: var(--rex-fb-accent);
    background: var(--rex-fb-btn-hover);
}

/* Page input + counter */
.rex-fb-pageinput-wrap{
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0 8px;
    margin: 0 2px;
    border-radius: 8px;
    background: var(--rex-fb-btn-hover);
    font-variant-numeric: tabular-nums;
    font-size: 14px;
    color: var(--rex-fb-fg);
}
.rex-fb-page-input{
    width: 42px;
    background: transparent;
    border: none;
    color: var(--rex-fb-fg);
    text-align: center;
    font-size: 14px;
    padding: 6px 0;
    -moz-appearance: textfield;
    appearance: textfield;
    font-variant-numeric: tabular-nums;
}
.rex-fb-page-input::-webkit-outer-spin-button,
.rex-fb-page-input::-webkit-inner-spin-button{ -webkit-appearance: none; margin: 0; }
.rex-fb-page-input:focus{ outline: none; }
.rex-fb-pageinput-wrap:focus-within{ box-shadow: 0 0 0 2px var(--rex-fb-accent); }
.rex-fb-pages-sep{ opacity: .5; }
.rex-fb-tot{ opacity: .8; }

/* ---------- Stage ---------- */
.rex-fb-stage{
    position: relative;
    z-index: 1;
    display: flex;
    min-height: 520px;
    height: calc(100% - 60px);
}
.rex-fb-book-container{
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 28px 24px;
    min-height: 520px;
    position: relative;
    overflow: hidden;
}
.rex-fb-book{
    max-width: 100%;
    transition: transform .35s cubic-bezier(.2, .8, .2, 1);
    will-change: transform;
    filter: drop-shadow(0 24px 36px rgba(0,0,0,.35));
}
.rex-fb-wrap.rex-fb-zoomed .rex-fb-book-container{
    overflow: auto;
    align-items: flex-start;
    justify-content: flex-start;
    cursor: zoom-out;
}
.rex-fb-wrap.rex-fb-zoomed .rex-fb-book{
    filter: drop-shadow(0 12px 28px rgba(0,0,0,.45));
}

.rex-fb-page{
    background: var(--rex-fb-page-bg);
    overflow: hidden;
}
.rex-fb-page img{
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    user-select: none;
    -webkit-user-drag: none;
    pointer-events: none;
}

/* Cover/back style hint */
.rex-fb-page-cover, .rex-fb-page-back{
    background: var(--rex-fb-bg2);
    box-shadow: inset 0 0 30px rgba(0,0,0,.25);
}

/* ---------- Loader ---------- */
.rex-fb-loader{
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    background: linear-gradient(135deg, rgba(0,0,0,.55), rgba(0,0,0,.75));
    backdrop-filter: blur(6px);
    z-index: 10;
    transition: opacity .3s;
    color: #fff;
}
.rex-fb-theme-light .rex-fb-loader{ background: linear-gradient(135deg, rgba(244,245,247,.85), rgba(230,232,237,.95)); color: #1f2937; }
.rex-fb-theme-sepia .rex-fb-loader{ background: linear-gradient(135deg, rgba(245,236,217,.85), rgba(232,216,179,.95)); color: #4a3a26; }
.rex-fb-spinner{
    width: 44px; height: 44px;
    border: 3px solid rgba(255,255,255,.18);
    border-top-color: var(--rex-fb-accent);
    border-radius: 50%;
    animation: rex-fb-spin .9s linear infinite;
}
.rex-fb-theme-light .rex-fb-spinner{ border-color: rgba(0,0,0,.12); border-top-color: var(--rex-fb-accent); }
.rex-fb-theme-sepia .rex-fb-spinner{ border-color: rgba(74,58,38,.18); border-top-color: var(--rex-fb-accent); }
@keyframes rex-fb-spin{ to { transform: rotate(360deg); } }
.rex-fb-loader-text{
    font-size: 13px;
    letter-spacing: .3px;
    opacity: .85;
}
.rex-fb-progress{
    width: 180px;
    height: 3px;
    background: rgba(255,255,255,.15);
    border-radius: 99px;
    overflow: hidden;
}
.rex-fb-theme-light .rex-fb-progress{ background: rgba(0,0,0,.1); }
.rex-fb-theme-sepia .rex-fb-progress{ background: rgba(74,58,38,.15); }
.rex-fb-progress-bar{
    height: 100%;
    width: 0;
    background: var(--rex-fb-accent);
    border-radius: inherit;
    transition: width .2s ease;
}

/* ---------- Sidebars (TOC + Thumbs) ---------- */
.rex-fb-sidebar{
    position: absolute;
    top: 0; bottom: 0; left: 0;
    width: 300px;
    max-width: 90%;
    background: var(--rex-fb-sidebar);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border-right: 1px solid var(--rex-fb-border);
    transform: translateX(-100%);
    transition: transform .32s cubic-bezier(.2,.8,.2,1);
    z-index: 5;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.rex-fb-sidebar-thumbs{ width: 220px; }
.rex-fb-sidebar-toc-open .rex-fb-sidebar-toc{ transform: translateX(0); }
.rex-fb-sidebar-thumbs-open .rex-fb-sidebar-thumbs{ transform: translateX(0); }

.rex-fb-sidebar-head{
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px 10px;
    border-bottom: 1px solid var(--rex-fb-border);
    flex-shrink: 0;
}
.rex-fb-sidebar-head h4{
    margin: 0;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.4px;
    color: var(--rex-fb-fg-dim);
}
.rex-fb-sidebar-close{
    background: transparent;
    color: var(--rex-fb-fg);
    border: none;
    cursor: pointer;
    width: 28px; height: 28px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background .15s;
}
.rex-fb-sidebar-close svg{ width: 18px; height: 18px; }
.rex-fb-sidebar-close:hover{ background: var(--rex-fb-btn-hover); }

/* TOC list */
.rex-fb-toc-list{
    list-style: none;
    padding: 6px 0;
    margin: 0;
    overflow-y: auto;
    flex: 1;
}
.rex-fb-toc-list button{
    width: 100%;
    background: transparent;
    color: var(--rex-fb-fg);
    border: none;
    border-bottom: 1px solid var(--rex-fb-border);
    padding: 13px 16px;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    transition: background .15s, padding-left .2s, color .15s;
}
.rex-fb-toc-list button:hover{
    background: var(--rex-fb-btn-hover);
    padding-left: 22px;
    color: var(--rex-fb-accent);
}
.rex-fb-toc-title{ flex: 1; line-height: 1.4; }
.rex-fb-toc-page{
    opacity: .55;
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    padding: 2px 8px;
    border: 1px solid var(--rex-fb-border);
    border-radius: 4px;
}
.rex-fb-toc-empty{
    padding: 16px;
    color: var(--rex-fb-fg-dim);
    font-size: 13px;
    text-align: center;
    list-style: none;
}

/* Thumbs grid */
.rex-fb-thumbs-grid{
    padding: 12px;
    overflow-y: auto;
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}
.rex-fb-thumb{
    background: transparent;
    border: 2px solid transparent;
    padding: 0;
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: border-color .18s, transform .12s;
    color: var(--rex-fb-fg);
}
.rex-fb-thumb:hover{ border-color: var(--rex-fb-border); transform: translateY(-1px); }
.rex-fb-thumb.is-active{ border-color: var(--rex-fb-accent); }
.rex-fb-thumb-img{
    background: var(--rex-fb-page-bg);
    border-radius: 4px;
    overflow: hidden;
    aspect-ratio: 3/4;
    display: block;
    box-shadow: 0 2px 8px rgba(0,0,0,.18);
}
.rex-fb-thumb-img img{
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.rex-fb-thumb-num{
    font-size: 11px;
    text-align: center;
    opacity: .7;
    font-variant-numeric: tabular-nums;
    padding-bottom: 2px;
}
.rex-fb-thumb.is-active .rex-fb-thumb-num{ color: var(--rex-fb-accent); opacity: 1; font-weight: 600; }

/* Scrollbar polish */
.rex-fb-toc-list::-webkit-scrollbar,
.rex-fb-thumbs-grid::-webkit-scrollbar{ width: 6px; }
.rex-fb-toc-list::-webkit-scrollbar-thumb,
.rex-fb-thumbs-grid::-webkit-scrollbar-thumb{
    background: var(--rex-fb-border);
    border-radius: 3px;
}

/* Render-progress chip (background page rendering) */
.rex-fb-render-chip{
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--rex-fb-btn-hover);
    border-radius: 20px;
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    color: var(--rex-fb-fg-dim);
    opacity: 0;
    transition: opacity .3s;
    margin-right: 4px;
}
.rex-fb-render-chip.is-visible{ opacity: 1; }
.rex-fb-render-chip-spinner{
    width: 12px; height: 12px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: rex-fb-spin .8s linear infinite;
    opacity: .7;
}
@media (max-width: 640px){
    .rex-fb-render-chip{ display: none; }
}

/* Placeholder pages (background rendering pending) */
.rex-fb-page-loading{
    position: relative;
}
.rex-fb-page-loading::after{
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(110deg, transparent 30%, rgba(255,255,255,.5) 50%, transparent 70%);
    background-size: 200% 100%;
    animation: rex-fb-shimmer 1.6s linear infinite;
    pointer-events: none;
}
@keyframes rex-fb-shimmer{
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
.rex-fb-thumb-loading .rex-fb-thumb-img{
    background: linear-gradient(110deg, #f0f0f0 30%, #fafafa 50%, #f0f0f0 70%);
    background-size: 200% 100%;
    animation: rex-fb-shimmer 1.6s linear infinite;
}

/* ---------- Toast ---------- */
.rex-fb-toast{
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translate(-50%, 80px);
    background: rgba(0,0,0,.88);
    color: #fff;
    padding: 10px 18px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    box-shadow: 0 6px 24px rgba(0,0,0,.35);
    opacity: 0;
    pointer-events: none;
    z-index: 20;
    transition: transform .35s cubic-bezier(.2,.8,.2,1), opacity .35s;
}
.rex-fb-toast.is-visible{
    transform: translate(-50%, 0);
    opacity: 1;
}

/* ---------- Search Sidebar ---------- */
.rex-fb-sidebar-search{ width: 320px; }
.rex-fb-sidebar-search-open .rex-fb-sidebar-search{ transform: translateX(0); }
.rex-fb-search-bar{
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: var(--rex-fb-btn-hover);
    margin: 12px;
    border-radius: 8px;
    border: 1px solid var(--rex-fb-border);
}
.rex-fb-search-bar svg{ width: 16px; height: 16px; opacity: .6; flex-shrink: 0; }
.rex-fb-search-input{
    flex: 1;
    background: none;
    border: none;
    color: var(--rex-fb-fg);
    font-size: 14px;
    outline: none;
    padding: 0;
    min-width: 0;
}
.rex-fb-search-input::placeholder{ color: var(--rex-fb-fg-dim); }
.rex-fb-search-status{
    padding: 0 16px 8px;
    font-size: 12px;
    color: var(--rex-fb-fg-dim);
    font-variant-numeric: tabular-nums;
}
.rex-fb-search-results{
    list-style: none;
    padding: 0;
    margin: 0;
    overflow-y: auto;
    flex: 1;
}
.rex-fb-search-results li{ margin: 0; }
.rex-fb-search-results button{
    width: 100%;
    background: transparent;
    color: var(--rex-fb-fg);
    border: none;
    border-bottom: 1px solid var(--rex-fb-border);
    padding: 12px 16px;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 13px;
    line-height: 1.45;
    transition: background .15s, padding-left .15s;
}
.rex-fb-search-results button:hover{
    background: var(--rex-fb-btn-hover);
    padding-left: 22px;
}
.rex-fb-search-result-page{
    flex-shrink: 0;
    background: var(--rex-fb-accent);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 12px;
    font-variant-numeric: tabular-nums;
    margin-top: 1px;
}
.rex-fb-search-result-snippet{
    flex: 1;
    color: var(--rex-fb-fg-dim);
}
.rex-fb-search-result-snippet mark{
    background: rgba(0, 169, 206, 0.25);
    color: var(--rex-fb-fg);
    font-weight: 600;
    padding: 0 2px;
    border-radius: 2px;
}

/* Toast with action button (resume bookmark) */
.rex-fb-toast.is-action{
    padding: 0;
    background: transparent;
    box-shadow: none;
}
.rex-fb-toast-action{
    background: rgba(0,169,206,.95);
    color: #fff;
    border: none;
    padding: 11px 18px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    box-shadow: 0 6px 24px rgba(0,0,0,.35);
    transition: background .15s, transform .15s;
}
.rex-fb-toast-action:hover{ background: rgba(0,169,206,1); transform: scale(1.03); }

/* Hard cover effect */
.rex-fb-hard-cover .rex-fb-page-cover,
.rex-fb-hard-cover .rex-fb-page-back{
    box-shadow:
        inset 0 0 0 1px rgba(0,0,0,.3),
        inset 0 0 12px rgba(0,0,0,.35),
        0 4px 8px rgba(0,0,0,.2);
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
}

/* ---------- Fullscreen ---------- */
.rex-fb-fullscreen{
    position: fixed !important;
    inset: 0 !important;
    z-index: 999999;
    border-radius: 0;
    width: 100vw !important;
    height: 100vh !important;
    max-width: none !important;
    display: flex;
    flex-direction: column;
}
.rex-fb-fullscreen .rex-fb-stage{
    flex: 1;
    height: auto !important;
    min-height: 0 !important;     /* override base min-height that causes clipping */
}
.rex-fb-fullscreen .rex-fb-book-container{
    min-height: 0 !important;
    padding: 14px 18px;
    height: 100%;
}

/* ---------- Mobile ---------- */
@media (max-width: 900px){
    .rex-fb-toolbar{ padding: 8px 10px; gap: 6px; flex-wrap: wrap; }
    .rex-fb-toolbar-left,
    .rex-fb-toolbar-center,
    .rex-fb-toolbar-right{ gap: 2px; }
}
@media (max-width: 640px){
    .rex-fb-wrap{ min-height: 420px; }
    .rex-fb-btn{ width: 34px; height: 34px; }
    .rex-fb-btn svg{ width: 18px; height: 18px; }
    .rex-fb-btn-sm{ display: none; } /* hide first/last on small screens */
    .rex-fb-page-input{ width: 36px; font-size: 13px; }
    .rex-fb-stage{ min-height: 420px; }
    .rex-fb-book-container{ padding: 12px; min-height: 420px; }
    .rex-fb-toolbar-center{ flex: 1 1 100%; justify-content: center; order: 3; }
    .rex-fb-toolbar-left{ order: 1; }
    .rex-fb-toolbar-right{ order: 2; margin-left: auto; }
    .rex-fb-sidebar{ width: 88%; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
    .rex-fb-book, .rex-fb-sidebar, .rex-fb-btn, .rex-fb-toast{ transition: none; }
    .rex-fb-spinner{ animation: none; }
}

/* ---------- Block editor wrapping ---------- */
.wp-block-shortcode .rex-fb-wrap{ margin: 0 auto; }

/* ---------- Download menu (PDF / HTML choice) ---------- */
.rex-fb-dl-menu{
    position: absolute;
    background: rgba(20, 22, 26, .98);
    color: #fff;
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 10px;
    box-shadow: 0 12px 36px rgba(0,0,0,.45);
    padding: 6px;
    min-width: 220px;
    z-index: 60;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    animation: rexFbDlMenuIn .14s ease-out;
}
.rex-fb-theme-light .rex-fb-dl-menu,
.rex-fb-theme-sepia .rex-fb-dl-menu{
    background: rgba(255,255,255,.98);
    color: #222;
    border-color: rgba(0,0,0,.08);
}
.rex-fb-dl-menu button{
    display: flex;
    width: 100%;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: transparent;
    border: 0;
    color: inherit;
    cursor: pointer;
    border-radius: 6px;
    font: inherit;
    font-size: 13px;
    text-align: left;
    transition: background .12s;
}
.rex-fb-dl-menu button:hover{ background: rgba(255,255,255,.08); }
.rex-fb-theme-light .rex-fb-dl-menu button:hover,
.rex-fb-theme-sepia .rex-fb-dl-menu button:hover{ background: rgba(0,0,0,.05); }
.rex-fb-dl-menu button svg{
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    color: var(--rex-fb-accent, #00a9ce);
}
@keyframes rexFbDlMenuIn{
    from{ opacity: 0; transform: translateY(-4px); }
    to{ opacity: 1; transform: translateY(0); }
}

/* ---------- Export progress overlay ---------- */
.rex-fb-export-overlay{
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,.62);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 90;
    opacity: 0;
    transition: opacity .22s ease;
}
.rex-fb-export-overlay.is-visible{ opacity: 1; }
.rex-fb-wrap.rex-fb-fullscreen .rex-fb-export-overlay{ position: fixed; }
.rex-fb-export-card{
    background: rgba(22, 24, 30, .98);
    color: #fff;
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 14px;
    padding: 28px 30px 24px;
    width: min(420px, 90%);
    text-align: center;
    box-shadow: 0 20px 60px rgba(0,0,0,.55);
}
.rex-fb-export-spinner{
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 3px solid rgba(255,255,255,.12);
    border-top-color: var(--rex-fb-accent, #00a9ce);
    margin: 0 auto 16px;
    animation: rexFbExportSpin 0.9s linear infinite;
}
.rex-fb-export-overlay.is-error .rex-fb-export-spinner{
    animation: none;
    border-top-color: #ff5b5b;
}
.rex-fb-export-title{
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 6px;
}
.rex-fb-export-step{
    font-size: 12px;
    opacity: .7;
    margin-bottom: 14px;
    min-height: 16px;
}
.rex-fb-export-bar{
    height: 6px;
    background: rgba(255,255,255,.08);
    border-radius: 4px;
    overflow: hidden;
}
.rex-fb-export-bar-fill{
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--rex-fb-accent, #00a9ce), #66d4ec);
    border-radius: 4px;
    transition: width .25s ease;
}
.rex-fb-export-overlay.is-error .rex-fb-export-bar-fill{
    background: #ff5b5b;
}
@keyframes rexFbExportSpin{
    to{ transform: rotate(360deg); }
}

/* ---------- Interactive hotspots overlay (live viewer) ---------- */
.rex-fb-hotspots{
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 2;
}
.rex-fb-hotspot{
    position: absolute;
    background: transparent;
    border: 0;
    cursor: pointer;
    pointer-events: auto;
    text-decoration: none;
    box-sizing: border-box;
    border-radius: 2px;
    transition: background .18s, box-shadow .18s, outline-color .18s;
    outline: 2px solid transparent;
    outline-offset: -2px;
    padding: 0;
    color: inherit;
    font: inherit;
}
.rex-fb-hotspot:hover,
.rex-fb-hotspot:focus-visible{
    background: rgba(0,169,206,.18);
    outline-color: var(--rex-fb-accent, #00a9ce);
    box-shadow: 0 0 0 1px rgba(0,169,206,.4) inset, 0 6px 18px rgba(0,0,0,.18);
}
.rex-fb-hotspot:focus{ outline: 2px solid var(--rex-fb-accent, #00a9ce); outline-offset: -2px; }
.rex-fb-hotspot-tip{
    position: absolute;
    left: 50%;
    bottom: 100%;
    transform: translate(-50%, -6px);
    background: rgba(15,18,24,.92);
    color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 12px;
    line-height: 1.3;
    white-space: nowrap;
    max-width: 240px;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0;
    pointer-events: none;
    transition: opacity .15s, transform .15s;
    box-shadow: 0 6px 20px rgba(0,0,0,.3);
}
.rex-fb-hotspot:hover .rex-fb-hotspot-tip,
.rex-fb-hotspot:focus-visible .rex-fb-hotspot-tip{
    opacity: 1;
    transform: translate(-50%, -10px);
}
/* StPageFlip wraps page DOM; ensure overlay tracks the page transform */
.rex-fb-page{ position: relative; }

/* ---------- Lock screen (password protection) ---------- */
.rex-fb-locked{
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 16px;
}
.rex-fb-lock-screen{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.rex-fb-lock-card{
    width: 100%;
    max-width: 400px;
    background: linear-gradient(160deg, rgba(28,32,40,.96), rgba(18,22,30,.98));
    color: #fff;
    border-radius: 16px;
    padding: 36px 32px 30px;
    box-shadow: 0 24px 60px rgba(0,0,0,.4), 0 0 0 1px rgba(255,255,255,.04) inset;
    text-align: center;
    backdrop-filter: blur(10px);
}
.rex-fb-theme-light .rex-fb-lock-card{
    background: linear-gradient(160deg, #ffffff, #f4f4f6);
    color: #1d2327;
    box-shadow: 0 24px 60px rgba(0,0,0,.12), 0 0 0 1px rgba(0,0,0,.04) inset;
}
.rex-fb-theme-sepia .rex-fb-lock-card{
    background: linear-gradient(160deg, #fdf6e3, #f0e6d2);
    color: #3a2c1a;
    box-shadow: 0 24px 60px rgba(58,44,26,.12), 0 0 0 1px rgba(58,44,26,.05) inset;
}
.rex-fb-lock-icon{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(0,169,206,.14);
    color: var(--rex-fb-accent, #00a9ce);
    margin: 0 auto 16px;
}
.rex-fb-lock-title{
    margin: 0 0 6px;
    font-size: 19px;
    font-weight: 600;
    line-height: 1.3;
}
.rex-fb-lock-sub{
    margin: 0 0 24px;
    font-size: 13px;
    opacity: .7;
}
.rex-fb-lock-form{
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-align: left;
}
.rex-fb-lock-pwd-wrap{
    position: relative;
    display: block;
}
.rex-fb-lock-pwd{
    width: 100%;
    background: rgba(255,255,255,.06);
    border: 1px solid rgba(255,255,255,.12);
    color: inherit;
    padding: 12px 44px 12px 14px;
    border-radius: 10px;
    font: inherit;
    font-size: 15px;
    transition: border-color .15s, background .15s;
}
.rex-fb-theme-light .rex-fb-lock-pwd,
.rex-fb-theme-sepia .rex-fb-lock-pwd{
    background: rgba(0,0,0,.04);
    border-color: rgba(0,0,0,.12);
}
.rex-fb-lock-pwd:focus{
    outline: none;
    border-color: var(--rex-fb-accent, #00a9ce);
    background: rgba(255,255,255,.08);
}
.rex-fb-theme-light .rex-fb-lock-pwd:focus,
.rex-fb-theme-sepia .rex-fb-lock-pwd:focus{
    background: #fff;
}
.rex-fb-lock-toggle{
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: 0;
    color: inherit;
    opacity: .55;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    line-height: 0;
    transition: opacity .15s, background .15s;
}
.rex-fb-lock-toggle:hover{ opacity: 1; background: rgba(255,255,255,.06); }
.rex-fb-theme-light .rex-fb-lock-toggle:hover,
.rex-fb-theme-sepia .rex-fb-lock-toggle:hover{ background: rgba(0,0,0,.05); }
.rex-fb-lock-remember{
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    opacity: .75;
    cursor: pointer;
    user-select: none;
}
.rex-fb-lock-remember input{ margin: 0; }
.rex-fb-lock-submit{
    background: var(--rex-fb-accent, #00a9ce);
    color: #fff;
    border: 0;
    padding: 12px;
    border-radius: 10px;
    font: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: filter .15s, transform .08s;
    margin-top: 4px;
}
.rex-fb-lock-submit:hover{ filter: brightness(1.1); }
.rex-fb-lock-submit:active{ transform: translateY(1px); }
.rex-fb-lock-submit:disabled{ opacity: .6; cursor: wait; }
.rex-fb-lock-error{
    background: rgba(255,91,91,.12);
    color: #ff8d8d;
    border: 1px solid rgba(255,91,91,.22);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 13px;
    text-align: center;
    margin-top: 4px;
}
.rex-fb-theme-light .rex-fb-lock-error,
.rex-fb-theme-sepia .rex-fb-lock-error{
    color: #b32d2e;
    background: rgba(179,45,46,.08);
    border-color: rgba(179,45,46,.2);
}

/* ---------- Lead capture (email gate) ---------- */
.rex-fb-lead-gate{
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 16px;
}
.rex-fb-lead-card{
    max-width: 440px;
}
.rex-fb-lead-form{
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-align: left;
}
.rex-fb-lead-field{
    display: block;
    font-size: 12px;
    font-weight: 500;
}
.rex-fb-lead-field > span{
    display: block;
    margin-bottom: 4px;
    opacity: .7;
    font-weight: 500;
}
.rex-fb-lead-field input{
    width: 100%;
    background: rgba(255,255,255,.06);
    border: 1px solid rgba(255,255,255,.12);
    color: inherit;
    padding: 10px 14px;
    border-radius: 10px;
    font: inherit;
    font-size: 14px;
    transition: border-color .15s, background .15s;
}
.rex-fb-theme-light .rex-fb-lead-field input,
.rex-fb-theme-sepia .rex-fb-lead-field input{
    background: rgba(0,0,0,.04);
    border-color: rgba(0,0,0,.12);
}
.rex-fb-lead-field input:focus{
    outline: none;
    border-color: var(--rex-fb-accent, #00a9ce);
    background: rgba(255,255,255,.08);
}
.rex-fb-theme-light .rex-fb-lead-field input:focus,
.rex-fb-theme-sepia .rex-fb-lead-field input:focus{
    background: #fff;
}
.rex-fb-lead-field.is-error input{
    border-color: rgba(255,91,91,.6);
    background: rgba(255,91,91,.06);
}
.rex-fb-lead-field.is-error > span{
    color: #ff8d8d;
    opacity: 1;
}
.rex-fb-theme-light .rex-fb-lead-field.is-error > span,
.rex-fb-theme-sepia .rex-fb-lead-field.is-error > span{
    color: #b32d2e;
}
.rex-fb-lead-privacy{
    font-size: 11px;
    opacity: .55;
    margin: 6px 0 0;
    line-height: 1.45;
    text-align: center;
}