:root{
  --fb-bg:#3b342d;
  --fb-bg2:#221e1a;
  --fb-bar:rgba(20,17,14,.82);
  --fb-fg:#f3eee7;
  --fb-muted:rgba(243,238,231,.6);
  --fb-accent:#c9b79c;
  --fb-radius:10px;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--fb-bg2);overflow:hidden}
body{font:14px/1.3 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--fb-fg);-webkit-tap-highlight-color:transparent}

.fb{position:relative;width:100%;height:100%;height:100dvh;display:flex;flex-direction:column;
  background:radial-gradient(ellipse at 50% 40%,var(--fb-bg) 0%,var(--fb-bg2) 100%);overflow:hidden;user-select:none}
.fb.fb-pseudo-fs{position:fixed;inset:0;z-index:99999}

/* ---------- stage ---------- */
.fb-main{position:relative;flex:1;min-height:0;display:flex}
.fb-stagebox{position:relative;flex:1;min-width:0}
.fb-stage{position:absolute;inset:0;overflow:hidden;display:flex;align-items:center;justify-content:center}
.fb-stage.zoomed{overflow:auto;display:block;cursor:grab;touch-action:pan-x pan-y}
.fb-stage.zoomed .fb-bookwrap{margin:auto}
.fb-bookwrap{position:relative;flex:none;display:flex;align-items:center;justify-content:center}
.fb-stage.zoomed .fb-bookwrap{display:block}
.fb-book{flex:none}
.fb-shadow{position:absolute;left:4%;right:4%;bottom:-18px;height:24px;border-radius:50%;
  background:radial-gradient(ellipse at center,rgba(0,0,0,.45),transparent 70%);pointer-events:none;filter:blur(4px)}

.fb-page{background:#fff;overflow:hidden}
.fb-page img{display:block;width:100%;height:100%;object-fit:fill;pointer-events:none;-webkit-user-drag:none}
.fb-page .fb-ph{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#f4f1ec}
.fb-page .fb-ph::after{content:"";width:28px;height:28px;border-radius:50%;border:3px solid #d9d0c3;border-top-color:#8c7b66;animation:fbspin 0.9s linear infinite}
.fb-page.loaded .fb-ph{display:none}
/* rug-schaduw */
.fb-page.--left::after,.fb-page.--right::after{content:"";position:absolute;top:0;bottom:0;width:8%;pointer-events:none}
.fb-page.--left::after{right:0;background:linear-gradient(to left,rgba(0,0,0,.18),transparent)}
.fb-page.--right::after{left:0;background:linear-gradient(to right,rgba(0,0,0,.18),transparent)}

/* zij-pijlen */
.fb-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:5;width:48px;height:72px;border:0;border-radius:var(--fb-radius);
  background:rgba(0,0,0,.18);color:var(--fb-fg);cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:.55;transition:opacity .2s,background .2s}
.fb-arrow:hover{opacity:1;background:rgba(0,0,0,.35)}
.fb-arrow[disabled]{opacity:0;pointer-events:none}
.fb-arrow.prev{left:10px}.fb-arrow.next{right:10px}
.fb-arrow svg{width:28px;height:28px}
.fb.narrow .fb-arrow{width:30px;height:52px;background:rgba(0,0,0,.28);opacity:.55}
.fb.narrow .fb-arrow.prev{left:4px}.fb.narrow .fb-arrow.next{right:4px}
.fb.is-zoomed .fb-arrow{display:none}

/* ---------- thumbnails ---------- */
.fb-thumbs{flex:none;width:0;overflow:hidden;background:rgba(15,13,11,.9);transition:width .25s ease;display:flex;flex-direction:column}
.fb.thumbs-open .fb-thumbs{width:220px}
.fb-thumbs-head{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;font-weight:600;border-bottom:1px solid rgba(255,255,255,.08);white-space:nowrap}
.fb-thumbs-list{flex:1;overflow-y:auto;padding:12px;display:grid;grid-template-columns:1fr 1fr;gap:12px 8px;align-content:start}
.fb-thumb{cursor:pointer;text-align:center;font-size:11px;color:var(--fb-muted)}
.fb-thumb .t{aspect-ratio:var(--fb-ratio,0.707);background:#e9e4dc;border-radius:3px;overflow:hidden;outline:2px solid transparent;outline-offset:2px;transition:outline-color .15s}
.fb-thumb img{width:100%;height:100%;display:block;object-fit:cover}
.fb-thumb:hover .t{outline-color:rgba(255,255,255,.3)}
.fb-thumb.active .t{outline-color:var(--fb-accent)}
.fb-thumb.active{color:var(--fb-fg)}
.fb.narrow.thumbs-open .fb-thumbs{position:absolute;inset:0;width:100%;z-index:20}
.fb.narrow .fb-thumbs-list{grid-template-columns:repeat(auto-fill,minmax(90px,1fr))}

/* ---------- toolbar ---------- */
.fb-bar{flex:none;position:relative;z-index:30;display:flex;align-items:center;justify-content:center;gap:2px;padding:6px 8px;
  padding-bottom:max(6px,env(safe-area-inset-bottom));background:var(--fb-bar);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.fb-title{position:absolute;left:14px;top:50%;transform:translateY(-50%);max-width:22%;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--fb-muted)}
.fb-sep{width:1px;height:22px;background:rgba(255,255,255,.14);margin:0 6px}
.fb-btn{flex:none;width:38px;height:38px;border:0;border-radius:8px;background:transparent;color:var(--fb-fg);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:background .15s,color .15s}
.fb-btn:hover{background:rgba(255,255,255,.1)}
.fb-btn:active{background:rgba(255,255,255,.18)}
.fb-btn[disabled]{opacity:.35;pointer-events:none}
.fb-btn.on{color:var(--fb-accent)}
.fb-btn svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.fb-pager{display:flex;align-items:center;gap:4px;margin:0 4px;color:var(--fb-muted);white-space:nowrap}
.fb-pager input{width:64px;height:30px;border:1px solid rgba(255,255,255,.18);border-radius:6px;background:rgba(0,0,0,.25);color:var(--fb-fg);
  text-align:center;font:inherit;font-size:13px;padding:0 4px}
.fb-pager input:focus{outline:none;border-color:var(--fb-accent)}
.fb-zoomlbl{min-width:42px;text-align:center;font-size:12px;color:var(--fb-muted)}

/* smalle schermen: secundaire knoppen naar menu */
.fb-more-wrap{position:relative;display:none}
.fb.narrow .fb-sec{display:none}
.fb.narrow .fb-more-wrap{display:block}
.fb:not(.wide) .fb-title{display:none}
.fb.narrow .fb-sep{margin:0 2px}
.fb.narrow .fb-pager input{width:58px}
.fb-menu{position:absolute;right:0;bottom:calc(100% + 10px);min-width:220px;padding:6px;border-radius:12px;background:rgba(24,21,18,.97);
  box-shadow:0 10px 30px rgba(0,0,0,.45);display:none;flex-direction:column}
.fb-menu.open{display:flex}
.fb-menu button{display:flex;align-items:center;gap:12px;width:100%;padding:10px 12px;border:0;border-radius:8px;background:transparent;color:var(--fb-fg);font:inherit;text-align:left;cursor:pointer}
.fb-menu button:hover{background:rgba(255,255,255,.08)}
.fb-menu button[disabled]{opacity:.35}
.fb-menu button.on{color:var(--fb-accent)}
.fb-menu svg{width:20px;height:20px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* ---------- loader / toast ---------- */
.fb-loader{position:absolute;inset:0;z-index:50;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;background:inherit;transition:opacity .4s}
.fb-loader.hide{opacity:0;pointer-events:none}
.fb-loader .bar{width:min(260px,60vw);height:4px;border-radius:2px;background:rgba(255,255,255,.12);overflow:hidden}
.fb-loader .bar i{display:block;height:100%;width:0;background:var(--fb-accent);transition:width .2s}
.fb-loader .txt{color:var(--fb-muted);font-size:13px}
.fb-toast{position:absolute;left:50%;bottom:72px;transform:translateX(-50%) translateY(10px);z-index:60;padding:8px 14px;border-radius:8px;background:rgba(0,0,0,.8);
  color:#fff;font-size:13px;opacity:0;transition:opacity .2s,transform .2s;pointer-events:none}
.fb-toast.show{opacity:1;transform:translateX(-50%)}
@keyframes fbspin{to{transform:rotate(360deg)}}

/* slide-modus: spread aan elkaar, één pagina in beeld */
.fb.slide-mode .fb-stage{touch-action:pan-y}
.fb.slide-mode .fb-shadow{display:none}
.fb-bookwrap{will-change:transform}