/* Self-hosted flipbook viewer (replaces Issuu reader) */
.fbk-stage{position:relative;background:#22262d;display:flex;flex-direction:column;min-height:480px}
.fbk-stage:fullscreen{min-height:100vh}

.fbk-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 18px;background:#171a1f;color:#fff;flex-wrap:wrap}
.fbk-title{font-size:15px;font-weight:600;letter-spacing:.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fbk-controls{display:flex;align-items:center;gap:8px}
.fbk-counter{font-size:13px;color:#c9cdd4;margin-right:6px;font-variant-numeric:tabular-nums}
.fbk-btn{display:inline-flex;align-items:center;gap:5px;background:rgba(255,255,255,.08);border:none;border-radius:6px;color:#fff;padding:7px 9px;cursor:pointer;font-size:12px;line-height:1;text-decoration:none;transition:background .15s}
.fbk-btn:hover{background:rgba(255,255,255,.2);color:#fff;text-decoration:none}
a.fbk-dl{font-weight:600}

.fbk-viewport{position:relative;flex:1;display:flex;align-items:center;justify-content:center;padding:24px 56px;overflow:hidden}
.fbk-bookwrap{width:min(100%, calc((100vh - 320px) * var(--fbk-ar, 1.55)));min-width:min(100%,280px);margin:0 auto}
.fbk-stage:fullscreen .fbk-bookwrap{width:min(100%, calc((100vh - 120px) * var(--fbk-ar, 1.55)))}
#fbk-book{width:100%}
.fbk-page{background:#fff}
.fbk-page img{width:100%;height:100%;object-fit:contain;display:block;user-select:none;-webkit-user-drag:none}

.fbk-nav{position:absolute;top:50%;transform:translateY(-50%);z-index:5;background:rgba(23,26,31,.65);color:#fff;border:none;border-radius:50%;width:44px;height:44px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background .15s,opacity .15s}
.fbk-nav:hover{background:rgba(23,26,31,.95)}
.fbk-nav[disabled]{opacity:.25;cursor:default}
.fbk-prev{left:8px}
.fbk-next{right:8px}

.fbk-zoom-overlay{position:absolute;inset:0;z-index:20;background:rgba(15,17,20,.97)}
.fbk-zoom-scroll{position:absolute;inset:0;overflow:auto;text-align:center;padding:20px 0}
.fbk-zoom-scroll img{max-width:none;width:auto;margin:0 auto 20px;display:block;background:#fff}
.fbk-zoom-close{position:absolute;top:12px;right:16px;z-index:21;background:rgba(255,255,255,.12)}

@media screen and (max-width:768px){
    .fbk-viewport{padding:14px 6px}
    .fbk-nav{width:36px;height:36px}
    .fbk-prev{left:2px}
    .fbk-next{right:2px}
    .fbk-title{font-size:13px;max-width:45vw}
    .fbk-bookwrap{width:100%}
}