:root{
  /* Bookbinding palette */
  --cloth:#1B2A41;        /* bookcloth navy chrome */
  --cloth-deep:#141F31;
  --cloth-line:#2C3B54;
  --board:#E9E6DF;        /* bookboard workspace surround */
  --board-deep:#DED9CE;
  --paper:#FFFFFF;
  --hairline:#E4E0D6;
  --brass:#B8893B;        /* foil accent */
  --brass-lt:#CFA24F;
  --ink:#22252B;
  --muted:#6B6F76;
  --cloth-ink:#EDE8DC;    /* text on cloth */
  --cloth-muted:#96A0B2;
  --danger:#B14B3C;
  --radius:10px;
  --shadow-panel:0 1px 0 rgba(0,0,0,.02), 0 8px 24px rgba(20,31,49,.06);
  --font-display:'Fraunces', Georgia, serif;
  --font-ui:'Inter', system-ui, -apple-system, sans-serif;
}

*{box-sizing:border-box}
/* The [hidden] attribute must always win over class rules that set a display
   value (e.g. .modal-back{display:grid}); otherwise hidden overlays keep
   intercepting pointer events across the whole page. */
[hidden]{display:none !important}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font-ui);
  color:var(--ink);
  background:var(--board);
  -webkit-font-smoothing:antialiased;
  overflow:hidden;
}
button{font-family:inherit;cursor:pointer}
input,select{font-family:inherit}

/* ---------- Top bar ---------- */
.topbar{
  height:56px;display:flex;align-items:center;gap:20px;
  padding:0 16px;
  background:var(--cloth);
  color:var(--cloth-ink);
  border-bottom:1px solid var(--cloth-deep);
}
.brand{display:flex;align-items:baseline;gap:8px}
.brand-mark{
  width:16px;height:20px;border-radius:2px;align-self:center;
  background:linear-gradient(160deg,var(--brass-lt),var(--brass));
  box-shadow:inset -3px 0 0 rgba(0,0,0,.25), inset 1px 0 0 rgba(255,255,255,.25);
  position:relative;
}
.brand-mark::after{content:"";position:absolute;left:3px;top:3px;bottom:3px;width:1px;background:rgba(255,255,255,.35)}
.brand-name{font-family:var(--font-display);font-weight:600;font-size:20px;letter-spacing:.2px}
.brand-sub{font-size:12px;color:var(--cloth-muted);letter-spacing:.3px;text-transform:uppercase}

.topbar-project{flex:1;display:flex;align-items:center;gap:10px;justify-content:center;min-width:0}
.project-title{
  background:transparent;border:1px solid transparent;color:var(--cloth-ink);
  font-family:var(--font-display);font-size:16px;padding:6px 10px;border-radius:8px;
  text-align:center;max-width:340px;
}
.project-title:hover{border-color:var(--cloth-line)}
.project-title:focus{outline:none;border-color:var(--brass);background:rgba(0,0,0,.15)}
.save-state{font-size:11px;color:var(--cloth-muted);white-space:nowrap;min-width:48px}
.save-state.dirty{color:var(--brass-lt)}

.topbar-actions{display:flex;align-items:center;gap:8px}
.divider{width:1px;height:22px;background:var(--cloth-line)}

.btn{
  border:1px solid transparent;border-radius:8px;padding:8px 14px;font-size:13px;font-weight:600;
  transition:background .15s,border-color .15s,transform .05s;
}
.btn:active{transform:translateY(1px)}
.btn.ghost{background:transparent;color:var(--cloth-ink);border-color:var(--cloth-line)}
.btn.ghost:hover{background:rgba(255,255,255,.06)}
.btn.solid{background:var(--brass);color:#20160a;border-color:var(--brass)}
.btn.solid:hover{background:var(--brass-lt)}
.btn.wide{width:100%;justify-content:center;display:flex}

/* ---------- Workspace layout ---------- */
.workspace{display:grid;grid-template-columns:180px 1fr 300px;height:calc(100% - 56px)}

/* ---------- Left rail (spines) ---------- */
.rail{
  background:var(--cloth-deep);color:var(--cloth-ink);
  display:flex;flex-direction:column;min-height:0;border-right:1px solid #0e1727;
}
.rail-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 14px;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--cloth-muted);
}
.spines{flex:1;overflow-y:auto;padding:4px 12px 12px;display:flex;flex-direction:column;gap:10px}
.spine{
  position:relative;border-radius:6px;overflow:hidden;cursor:pointer;
  border:1px solid var(--cloth-line);background:#0f1826;
  box-shadow:inset 4px 0 0 var(--cloth-line);
  transition:box-shadow .15s,border-color .15s;
}
.spine:hover{border-color:#42557a}
.spine.active{box-shadow:inset 4px 0 0 var(--brass);border-color:var(--brass)}
.spine .thumb{display:block;width:100%;aspect-ratio:1/1;background-size:cover;background-position:center}
.spine .num{
  position:absolute;top:4px;right:6px;font-size:10px;color:var(--cloth-muted);
  background:rgba(0,0,0,.45);border-radius:4px;padding:1px 5px;
}
.rail-foot{padding:12px;display:grid;gap:8px;border-top:1px solid #0e1727}

.mini{
  background:rgba(255,255,255,.06);color:var(--cloth-ink);border:1px solid var(--cloth-line);
  border-radius:7px;padding:6px 10px;font-size:12px;font-weight:600;
}
.mini:hover{background:rgba(255,255,255,.12)}
.mini.wide{width:100%}
.mini.danger{color:#f0b4aa;border-color:#5a2e28}
.mini.danger:hover{background:#3a201c}

/* ---------- Center stage ---------- */
.stage{display:flex;flex-direction:column;min-width:0;background:
   radial-gradient(circle at 20% 0%, #f1eee7, var(--board) 60%);}
.toolstrip{
  height:52px;display:flex;align-items:center;gap:6px;padding:0 14px;
  border-bottom:1px solid var(--board-deep);background:rgba(255,255,255,.4);backdrop-filter:blur(4px);
}
.tool{
  display:flex;align-items:center;gap:7px;background:var(--paper);color:var(--ink);
  border:1px solid var(--hairline);border-radius:8px;padding:7px 12px;font-size:13px;font-weight:600;
  box-shadow:var(--shadow-panel);
}
.tool:hover{border-color:var(--brass);color:var(--cloth)}
.tool .ico{font-size:13px;color:var(--brass);width:14px;text-align:center}
.tool-sep{width:1px;height:24px;background:var(--board-deep);margin:0 4px}
.zoom{margin-left:auto;display:flex;align-items:center;gap:8px;background:var(--paper);
  border:1px solid var(--hairline);border-radius:8px;padding:4px 6px}
.zoom span{font-size:12px;color:var(--muted);min-width:44px;text-align:center}
.zoom .mini{background:transparent;color:var(--ink);border:none;padding:2px 8px;font-size:16px}
.zoom .mini:hover{background:var(--board)}

.menu-wrap{position:relative}
.menu{
  position:absolute;top:calc(100% + 8px);left:0;z-index:40;width:230px;
  background:var(--paper);border:1px solid var(--hairline);border-radius:12px;
  box-shadow:0 14px 40px rgba(20,31,49,.16);padding:6px;
}
.menu button{
  display:flex;align-items:center;gap:10px;width:100%;text-align:left;
  background:transparent;border:none;border-radius:8px;padding:9px 10px;font-size:13px;color:var(--ink);
}
.menu button:hover{background:var(--board)}
.menu .tmpl-ico{width:26px;height:20px;border:1px solid var(--brass);border-radius:3px;flex:none;position:relative;background:#fff}

.canvas-scroll{flex:1;overflow:auto;display:grid;place-items:center;padding:34px}
.canvas-shadow{
  background:var(--paper);
  box-shadow:0 2px 2px rgba(20,31,49,.06),0 18px 50px rgba(20,31,49,.18);
  position:relative;
}
/* subtle book gutter on the left edge */
.canvas-shadow::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:24px;pointer-events:none;z-index:3;
  background:linear-gradient(90deg, rgba(20,31,49,.10), rgba(20,31,49,0));
}
.canvas{position:relative;overflow:hidden;outline:none;background:#fff}

/* ---------- Elements on canvas ---------- */
.el{position:absolute;user-select:none;touch-action:none}
.el.photo{overflow:hidden}
.el.photo img{width:100%;height:100%;object-fit:cover;display:block;pointer-events:none;transform-origin:center}
.el.photo.framed{border:6px solid #fff;background:#fff}
.el.photo.shadowed{box-shadow:0 10px 24px rgba(20,31,49,.28)}
.el.text{display:flex}
.el.text .txt{
  width:100%;outline:none;white-space:pre-wrap;word-break:break-word;overflow-wrap:anywhere;
  cursor:text;
}
.el .frame-3d{width:100%;height:100%;transform-style:preserve-3d}

.el.selected{z-index:5}
.el .handles{position:absolute;inset:0;pointer-events:none}
.el.selected .handles{outline:1.5px solid var(--brass);outline-offset:0}
.handle{
  position:absolute;width:12px;height:12px;background:linear-gradient(160deg,var(--brass-lt),var(--brass));
  border:1px solid #7c5a1e;border-radius:2px;pointer-events:auto;
  box-shadow:0 1px 2px rgba(0,0,0,.3);
}
.handle.tl{left:-6px;top:-6px;cursor:nwse-resize}
.handle.tr{right:-6px;top:-6px;cursor:nesw-resize}
.handle.bl{left:-6px;bottom:-6px;cursor:nesw-resize}
.handle.br{right:-6px;bottom:-6px;cursor:nwse-resize}
.handle.rot{
  left:50%;top:-30px;margin-left:-7px;width:14px;height:14px;border-radius:50%;cursor:grab;
}
.rot-stem{position:absolute;left:50%;top:-18px;width:1px;height:18px;background:var(--brass);margin-left:-.5px;pointer-events:none}
.el.cropping{cursor:move}
.el.cropping img{cursor:move}
.el.cropping .handles{outline:2px dashed var(--brass)}

/* ---------- Inspector ---------- */
.inspector{background:var(--paper);border-left:1px solid var(--hairline);overflow-y:auto}
.panel{padding:18px 16px 26px}
.panel-title{font-family:var(--font-display);font-weight:600;font-size:17px;margin:0 0 14px}
.panel-title-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.panel-title-row .panel-title{margin:0}

.field{margin-bottom:16px}
.field.row{display:flex;gap:12px}
.field .col{flex:1;min-width:0}
.field > label,.col > label{display:block;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:7px}
.field .val{color:var(--brass);font-weight:600;text-transform:none;letter-spacing:0;float:right}

.segmented{display:flex;background:var(--board);border-radius:9px;padding:3px;gap:2px}
.segmented button{flex:1;border:none;background:transparent;padding:7px 4px;border-radius:7px;font-size:12px;font-weight:600;color:var(--muted)}
.segmented button.on{background:var(--paper);color:var(--ink);box-shadow:0 1px 3px rgba(20,31,49,.14)}

.swatches{display:grid;grid-template-columns:repeat(6,1fr);gap:7px}
.swatch{aspect-ratio:1/1;border-radius:7px;border:1px solid rgba(0,0,0,.08);cursor:pointer;position:relative}
.swatch:hover{transform:scale(1.06)}
.swatch.on::after{content:"";position:absolute;inset:-3px;border:2px solid var(--brass);border-radius:9px}

.color-row{display:flex;align-items:center;gap:8px}
input[type=color]{width:38px;height:34px;padding:0;border:1px solid var(--hairline);border-radius:8px;background:none;cursor:pointer}
.hex{flex:1;min-width:0;border:1px solid var(--hairline);border-radius:8px;padding:8px 10px;font-size:13px;text-transform:uppercase}
.hex:focus{outline:none;border-color:var(--brass)}

.select{width:100%;border:1px solid var(--hairline);border-radius:8px;padding:9px 10px;font-size:13px;background:var(--paper)}
.select:focus{outline:none;border-color:var(--brass)}

.chip-row,.toggle-row{display:flex;flex-wrap:wrap;gap:6px}
.chip{
  border:1px solid var(--hairline);background:var(--paper);border-radius:7px;padding:7px 10px;
  font-size:12px;font-weight:600;color:var(--ink);
}
.chip:hover{border-color:var(--brass)}
.chip.on{background:var(--cloth);color:var(--cloth-ink);border-color:var(--cloth)}

input[type=range]{width:100%;-webkit-appearance:none;appearance:none;height:4px;border-radius:3px;background:var(--board-deep);margin:8px 0}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;
  background:linear-gradient(160deg,var(--brass-lt),var(--brass));border:1px solid #7c5a1e;cursor:pointer}
input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;
  background:var(--brass);border:1px solid #7c5a1e;cursor:pointer}

.hint{font-size:12px;color:var(--muted);line-height:1.5;margin-top:6px}
.hint b{color:var(--ink)}

/* ---------- Modal / toast ---------- */
.modal-back{position:fixed;inset:0;background:rgba(20,31,49,.45);display:grid;place-items:center;z-index:100}
.modal{background:var(--paper);border-radius:16px;padding:26px;width:min(440px,92vw);box-shadow:0 24px 60px rgba(0,0,0,.3)}
.modal h2{font-family:var(--font-display);margin:0 0 10px;font-size:20px}
.modal p{font-size:14px;line-height:1.6;color:#41454c;margin:0 0 20px}
.modal-actions{display:flex;justify-content:flex-end;gap:10px}
.modal .btn.ghost{color:var(--ink);border-color:var(--hairline)}
.modal .btn.ghost:hover{background:var(--board)}

.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);
  background:var(--cloth);color:var(--cloth-ink);padding:11px 18px;border-radius:10px;font-size:13px;
  box-shadow:0 12px 30px rgba(0,0,0,.3);z-index:120}

/* ---------- Export modal ---------- */
.export-modal{width:min(560px,94vw)}
.modal-sub{font-size:13px;line-height:1.55;color:#41454c;margin:0 0 18px}
.ex-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 16px}
.ex-grid .field{margin-bottom:0}
.ex-custom .color-row{align-items:center}
.ex-x{color:var(--muted);font-weight:600}
.ex-custom input[type=number]{text-transform:none}
.ex-summary{margin:16px 0 0;padding:12px 14px;background:var(--board);border-radius:10px;
  font-size:12.5px;line-height:1.6;color:#41454c}
.ex-summary b{color:var(--ink)}
.ex-warn{margin-top:12px;padding:10px 13px;border-radius:10px;font-size:12.5px;line-height:1.5;
  background:#fbf0dd;color:#7a5312;border:1px solid #ecd6a6}
.ex-progress{margin-top:16px}
.ex-bar{height:8px;border-radius:5px;background:var(--board-deep);overflow:hidden}
.ex-bar span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--brass-lt),var(--brass));
  transition:width .2s ease}
.ex-ptext{font-size:12px;color:var(--muted);margin-top:7px}
.ex-epubli{margin-top:14px}
.ex-epubli a{color:var(--brass);font-weight:600;text-decoration:none}
.ex-epubli a:hover{text-decoration:underline}
.ex-cover-note{margin:10px 0 0}
.export-modal .modal-actions{flex-wrap:wrap}
.modal-actions .btn[disabled]{opacity:.5;pointer-events:none}
@media (max-width:520px){ .ex-grid{grid-template-columns:1fr} }

/* ---------- Print ---------- */
.print-root{display:none}
@media print{
  body{overflow:visible;background:#fff}
  .topbar,.workspace,.modal-back,.toast{display:none !important}
  .print-root{display:block}
  .print-page{
    width:100%;page-break-after:always;position:relative;overflow:hidden;
    -webkit-print-color-adjust:exact;print-color-adjust:exact;
  }
  .print-page:last-child{page-break-after:auto}
  .print-page .el{position:absolute}
  .print-page img{width:100%;height:100%;object-fit:cover}
}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .workspace{grid-template-columns:64px 1fr 260px}
  .rail-head span,.spine .num{display:none}
  .rail-foot .mini{font-size:0;padding:8px}
  .rail-foot .mini::before{font-size:12px}
  #dupPageBtn::before{content:"⧉"}
  #delPageBtn::before{content:"🗑"}
}
@media (max-width:720px){
  .workspace{grid-template-columns:1fr;grid-template-rows:auto 1fr}
  .rail{flex-direction:row;height:76px;border-right:none;border-bottom:1px solid #0e1727}
  .spines{flex-direction:row}
  .rail-foot{display:none}
  .inspector{position:fixed;right:0;top:56px;bottom:0;width:280px;transform:translateX(100%);
    transition:transform .2s;z-index:60;box-shadow:-8px 0 30px rgba(0,0,0,.2)}
  .inspector.open{transform:none}
  .brand-sub{display:none}
}