/* Level D digital book — add-on layer (shelf link, search, bookmarks, print pages, presentation mode) */
.bk-shelf{display:inline-flex;align-items:center;gap:6px;font-weight:800;font-size:13px;text-decoration:none;color:var(--ink);border:1.5px solid var(--rule);border-radius:999px;padding:4px 11px;margin-right:10px;white-space:nowrap;background:var(--paper)}
.bk-shelf:hover{border-color:var(--sdg)}
.bk-tools{display:flex;gap:6px;flex:none;margin-left:8px}
.bk-tools button{border:1.5px solid var(--rule);background:var(--paper);color:var(--ink);border-radius:999px;padding:4px 11px;font:inherit;font-weight:700;font-size:13px;cursor:pointer;white-space:nowrap}
.bk-tools button:hover{border-color:var(--sdg)}
.bk-tools button[aria-pressed="true"]{background:var(--sdg);border-color:var(--sdg);color:#fff}
@media (max-width:760px){.bk-tools button span{display:none}.bk-tools button{padding:4px 9px}.bk-shelf span{display:none}}

/* drawers */
.bk-drawer{position:fixed;top:0;right:0;bottom:0;width:min(460px,100%);background:var(--paper);border-left:1.5px solid var(--rule);box-shadow:-12px 0 40px rgba(0,0,0,.18);z-index:60;display:flex;flex-direction:column;transform:translateX(105%);transition:transform .22s ease}
.bk-drawer.open{transform:none}
.bk-drawer header{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1.5px solid var(--rule)}
.bk-drawer header h2{margin:0;font-size:18px;flex:1}
.bk-drawer .bk-x{border:none;background:none;font-size:22px;cursor:pointer;color:var(--ink);line-height:1}
.bk-drawer .bk-body{overflow:auto;padding:14px 16px;flex:1}
.bk-drawer input[type=search]{width:100%;font:inherit;font-size:16px;padding:10px 12px;border:1.5px solid var(--rule);border-radius:10px;background:var(--paper);color:var(--ink)}
.bk-res{list-style:none;margin:12px 0 0;padding:0}
.bk-res li{border-bottom:1px solid var(--rule)}
.bk-res a{display:block;padding:10px 4px;text-decoration:none;color:var(--ink)}
.bk-res a:hover{background:var(--sdg-tint)}
.bk-res .where{font-size:12.5px;font-weight:800;color:var(--sdg-deep);text-transform:uppercase;letter-spacing:.3px}
.bk-res .snip{display:block;font-size:14.5px;margin-top:3px;line-height:1.45}
.bk-res mark,mark.bk-hit{background:#FFE066;color:#1d1d1d;border-radius:3px;padding:0 1px}
.bk-muted{color:var(--ink-2);font-size:14px}
.bk-pages img{width:100%;display:block;border:1px solid var(--rule);border-radius:4px;margin:0 0 12px;background:#fff}
.bk-pages .pg{font-size:12.5px;color:var(--ink-2);margin:0 0 4px}
.bk-toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%) translateY(20px);background:#1E1B3A;color:#fff;padding:10px 16px;border-radius:999px;font-weight:700;font-size:14px;opacity:0;transition:.25s;z-index:80;pointer-events:none}
.bk-toast.on{opacity:1;transform:translateX(-50%)}

/* presentation mode */
body.bk-present .nav .tabs,body.bk-present footer,body.bk-present .finish{display:none!important}
body.bk-present #view{zoom:var(--bk-zoom,1.25)}
body.bk-present #view .task{transition:opacity .25s ease}
body.bk-present.bk-spot #view .task:not(.bk-cur){opacity:.18}
body.bk-present #view .task.bk-cur{outline:4px solid var(--sdg);outline-offset:10px;border-radius:12px}
.bk-pbar{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);display:none;align-items:center;gap:6px;background:#1E1B3A;color:#fff;padding:8px 10px;border-radius:999px;box-shadow:0 10px 30px rgba(0,0,0,.3);z-index:70;font-size:14px}
body.bk-present .bk-pbar{display:flex}
.bk-pbar button{border:none;background:rgba(255,255,255,.1);color:#fff;font:inherit;font-weight:800;border-radius:999px;min-width:38px;height:38px;padding:0 12px;cursor:pointer}
.bk-pbar button:hover{background:rgba(255,255,255,.22)}
.bk-pbar button[aria-pressed="true"]{background:#FFC53D;color:#1E1B3A}
.bk-pbar .sep{width:1px;height:24px;background:rgba(255,255,255,.25);margin:0 4px}
.bk-pbar .lbl{min-width:84px;text-align:center;font-weight:700}
.bk-pbar .sw{width:20px;height:20px;border-radius:50%;border:2px solid #fff;padding:0;min-width:20px}
#bk-ink{position:fixed;inset:0;z-index:65;pointer-events:none;touch-action:none}
#bk-ink.draw{pointer-events:auto;cursor:crosshair}
@media print{.bk-tools,.bk-shelf,.bk-drawer,.bk-pbar,#bk-ink{display:none!important}}
.nav-in{max-width:1440px}
@media (max-width:1280px){.bk-tools button span,.bk-shelf span{display:none}.bk-tools button{padding:4px 9px}}