/* ── RESET & VARS ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0f0f13;--surface:#1a1a24;--surface2:#22222f;--border:#2e2e42;
  --accent:#6c63ff;--accent2:#ff6584;--text:#e8e8f0;--text2:#9090aa;
  --radius:10px;--cover-color:#dc143c;
  --book-w:520px;--book-h:728px;
}
body{background:var(--bg);color:var(--text);font-family:'Segoe UI',system-ui,sans-serif;height:100vh;display:flex;flex-direction:column;overflow:hidden;}

/* ── TOPBAR ── */
#topbar{background:var(--surface);border-bottom:1px solid var(--border);padding:10px 18px;display:flex;align-items:center;gap:10px;flex-shrink:0;flex-wrap:wrap;}
#topbar h1{font-size:1.05rem;font-weight:800;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;white-space:nowrap;}
#title-input{background:var(--surface2);border:1px solid var(--border);border-radius:6px;color:var(--text);padding:5px 10px;font-size:.82rem;width:180px;}
.spacer{flex:1;}
.btn{padding:6px 13px;border-radius:7px;border:none;cursor:pointer;font-size:.8rem;font-weight:600;transition:all .15s;display:inline-flex;align-items:center;gap:5px;white-space:nowrap;}
.btn-primary{background:var(--accent);color:#fff;}
.btn-primary:hover{background:#7c73ff;}
.btn-ghost{background:transparent;color:var(--text2);border:1px solid var(--border);}
.btn-ghost:hover{background:var(--surface2);color:var(--text);}
.btn-success{background:#16a34a;color:#fff;}
.btn-success:hover{background:#15803d;}
.btn:disabled{opacity:.4;cursor:not-allowed;}

/* ── LAYOUT ── */
#main{display:flex;flex:1;overflow:hidden;}
#sidebar{width:250px;background:var(--surface);border-right:1px solid var(--border);overflow-y:auto;flex-shrink:0;display:flex;flex-direction:column;}
#center{flex:1;display:flex;flex-direction:column;overflow:hidden;}
#thumbs-panel{width:110px;background:var(--surface);border-left:1px solid var(--border);overflow-y:auto;flex-shrink:0;}

/* ── SIDEBAR ── */
#upload-zone{margin:14px;border:2px dashed var(--border);border-radius:var(--radius);padding:24px 14px;text-align:center;cursor:pointer;transition:all .2s;}
#upload-zone:hover,#upload-zone.drag-over{border-color:var(--accent);background:rgba(108,99,255,.08);}
#upload-zone svg{opacity:.6;margin-bottom:6px;}
#upload-zone strong{font-size:.88rem;}
#upload-zone p{font-size:.75rem;color:var(--text2);}
#file-input{display:none;}
.s-section{padding:12px 14px;border-bottom:1px solid var(--border);}
.s-section h3{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text2);margin-bottom:9px;}
.s-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:7px;font-size:.81rem;}
.s-row label{color:var(--text2);}
input[type=color]{width:34px;height:24px;border:1px solid var(--border);border-radius:4px;padding:2px;background:var(--surface2);cursor:pointer;}
input[type=text]{background:var(--surface2);border:1px solid var(--border);border-radius:6px;color:var(--text);padding:4px 8px;font-size:.8rem;width:100%;}
select{background:var(--surface2);border:1px solid var(--border);border-radius:6px;color:var(--text);padding:4px 8px;font-size:.8rem;}
.toggle{position:relative;display:inline-block;width:34px;height:18px;}
.toggle input{opacity:0;width:0;height:0;}
.toggle-slider{position:absolute;inset:0;background:var(--border);border-radius:20px;cursor:pointer;transition:.2s;}
.toggle-slider:before{content:'';position:absolute;width:12px;height:12px;left:3px;bottom:3px;background:#fff;border-radius:50%;transition:.2s;}
.toggle input:checked+.toggle-slider{background:var(--accent);}
.toggle input:checked+.toggle-slider:before{transform:translateX(16px);}
#progress-wrap{display:none;margin:0 14px 12px;}
#progress-bar-bg{background:var(--border);border-radius:99px;height:5px;overflow:hidden;}
#progress-bar{height:100%;background:var(--accent);border-radius:99px;transition:width .15s;}
#progress-label{font-size:.72rem;color:var(--text2);margin-top:3px;}
#hotspot-list{max-height:140px;overflow-y:auto;}
.hotspot-item{background:var(--surface2);border-radius:6px;padding:5px 9px;margin-bottom:5px;font-size:.76rem;display:flex;align-items:center;justify-content:space-between;}
.hotspot-item span{color:var(--text2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:130px;}
.del-btn{background:none;border:none;color:#ef4444;cursor:pointer;font-size:.85rem;padding:2px 4px;}
.edit-btn{background:none;border:none;color:var(--text2);cursor:pointer;font-size:.8rem;padding:2px 4px;}
.edit-btn:hover{color:var(--accent);}
#logo-preview{margin-top:7px;display:none;}
#logo-img{max-width:100%;border-radius:5px;max-height:54px;object-fit:contain;}

/* ── TOOLBAR ── */
#toolbar{background:var(--surface2);border-bottom:1px solid var(--border);padding:7px 14px;display:flex;align-items:center;gap:6px;flex-shrink:0;flex-wrap:wrap;}
#zoom-label{font-size:.76rem;color:var(--text2);min-width:36px;text-align:center;}
.sep{width:1px;height:18px;background:var(--border);margin:0 3px;}

/* ── VIEWER ── */
#viewer-wrap{flex:1;display:flex;align-items:flex-start;justify-content:center;overflow:hidden;position:relative;padding-top:10px;}

/* ── EMPTY STATE ── */
#empty-state{text-align:center;padding:40px 20px;align-self:center;}
#empty-state .big-icon{font-size:3.5rem;margin-bottom:14px;}
#empty-state h2{font-size:1.2rem;margin-bottom:6px;}
#empty-state p{color:var(--text2);font-size:.85rem;}

/* ── FLIPBOOK CHECKBOXES (hidden) ── */
.fb-checkbox{display:none;}

/* ── SINGLE-PAGE PREVIEW ── */
#fb-scene{display:none;position:relative;align-items:center;justify-content:center;transform-origin:top center;}
#page-preview{
  width:var(--book-w);
  height:var(--book-h);
  position:relative;
  /* background:#fff; */
  border-radius:6px;
  overflow:hidden;
  /* box-shadow:0 8px 40px rgba(0,0,0,.5); */
}
#preview-img{
  position:absolute;inset:0;width:90%;height:100%;
  object-fit:contain;pointer-events:none;display:block;
}
/* hotspots on preview */
.hs-el{
  position:absolute;border:2px solid rgba(108,99,255,.7);
  border-radius:4px;background:transparent;
  cursor:pointer;z-index:15;transition:background .15s;
  display:flex;align-items:center;justify-content:center;
}
.hs-el:hover{background:rgba(108,99,255,.15);}
.hs-lbl{font-size:.62rem;color:var(--accent);background:rgba(0,0,0,.65);padding:1px 5px;border-radius:3px;}

/* NAV ARROWS */
.nav-arrow{
  position:absolute;top:50%;transform:translateY(-50%);
  background:rgba(0,0,0,.65);border:1px solid var(--border);
  color:var(--text);border-radius:50%;width:38px;height:38px;
  cursor:pointer;font-size:1.1rem;display:flex;align-items:center;
  justify-content:center;transition:all .15s;z-index:300;
}
.nav-arrow:hover{background:var(--accent);border-color:var(--accent);}
#btn-prev-nav{left:calc(50% - var(--book-w)/2 - 54px);}
#btn-next-nav{right:calc(50% - var(--book-w)/2 - 54px);}
#page-counter{
  position:absolute;bottom:10px;left:50%;transform:translateX(-50%);
  font-size:.72rem;color:var(--text2);background:rgba(0,0,0,.5);
  padding:3px 12px;border-radius:99px;pointer-events:none;z-index:300;
  white-space:nowrap;
}

/* HOTSPOT DRAW OVERLAY */
.hs-draw-ov{position:absolute;inset:0;cursor:crosshair;z-index:50;}
.hs-draw-rect{position:absolute;border:2px dashed var(--accent2);background:rgba(255,101,132,.15);pointer-events:none;}

/* THUMBNAILS */
.thumb{padding:7px;cursor:pointer;border-bottom:1px solid var(--border);transition:background .15s;position:relative;}
.thumb:hover{background:var(--surface2);}
.thumb.active{background:rgba(108,99,255,.2);}
.thumb img{width:100%;border-radius:3px;display:block;}
.thumb-num{font-size:.68rem;color:var(--text2);text-align:center;margin-top:3px;}
.thumb-hidden img{opacity:.35;}
.thumb-hidden .thumb-num{text-decoration:line-through;color:#ef4444;}
.thumb-eye{
  position:absolute;top:5px;right:5px;
  background:rgba(0,0,0,.55);border:none;border-radius:4px;
  font-size:.72rem;line-height:1;padding:2px 4px;cursor:pointer;
  opacity:0;transition:opacity .15s;
}
.thumb:hover .thumb-eye{opacity:1;}
.thumb-hidden .thumb-eye{opacity:1;}
/* hidden page banner in preview */
.preview-hidden-banner{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(0,0,0,.55);color:#ef4444;font-size:.9rem;font-weight:700;
  letter-spacing:.04em;pointer-events:none;z-index:20;border-radius:6px;
}

/* MODAL */
.modal-bg{position:fixed;inset:0;background:rgba(0,0,0,.75);z-index:500;display:flex;align-items:center;justify-content:center;}
.modal{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:22px;width:340px;max-width:95vw;}
.modal h3{margin-bottom:14px;font-size:.95rem;}
.form-group{margin-bottom:10px;}
.form-group label{font-size:.78rem;color:var(--text2);display:block;margin-bottom:3px;}
.modal-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:14px;}

/* TOAST */
#toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%) translateY(16px);
  background:var(--surface);border:1px solid var(--border);padding:9px 18px;
  border-radius:99px;font-size:.8rem;opacity:0;transition:all .3s;z-index:600;pointer-events:none;}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

::-webkit-scrollbar{width:5px;height:5px;}
::-webkit-scrollbar-track{background:transparent;}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:99px;}

@media(max-width:680px){
  :root{--book-w:300px;--book-h:420px;}
  #sidebar{display:none;}
  #thumbs-panel{display:none;}
  #btn-prev-nav{left:6px;}
  #btn-next-nav{right:6px;}
}

/* ── DASHBOARD ── */
#dashboard{position:fixed;inset:0;background:var(--bg);z-index:900;display:flex;align-items:flex-start;justify-content:center;padding:40px 20px;overflow-y:auto;}
#dash-panel{width:100%;max-width:860px;}
#dash-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px;}
#dash-header h2{font-size:1.4rem;font-weight:800;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
#dash-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;}
.dash-card{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 16px;cursor:pointer;transition:border-color .15s,transform .15s;}
.dash-card:hover{border-color:var(--accent);transform:translateY(-2px);}
.dash-card-title{font-weight:700;font-size:.95rem;margin-bottom:6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.dash-card-owner{font-size:.72rem;color:var(--accent);margin-bottom:3px;}
.dash-card-meta{font-size:.72rem;color:var(--text2);}
.dash-card-del{position:absolute;top:8px;right:8px;background:transparent;border:none;color:var(--text2);cursor:pointer;font-size:.8rem;opacity:0;transition:opacity .15s;padding:2px 5px;border-radius:4px;}
.dash-card:hover .dash-card-del{opacity:1;}
.dash-card-del:hover{background:var(--surface2);color:var(--accent2);}