/* ============================================================================
   DALFAST Premium 3D eBook Reader — Stylesheet
   Design system: navy nav, gold accents, white space, soft shadows.
   All colours are driven by CSS variables so themes can be swapped in one place.
   ========================================================================== */

:root{
  --bg:#FFFFFF;
  --bg-soft:#F5F7FA;

  --navy:#0B1F3B;
  --navy-2:#143462;

  --gold:#C99B2E;
  --gold-text:#A87F1F;
  --gold-soft:#F3E7C9;

  --orange:#E8913A;

  --ink:#14202E;
  --ink-soft:#5B6B7E;

  --line:#E3E8EF;

  --radius:14px;
  --shadow-card:0 10px 30px -18px rgba(11,31,59,.25);

  /* Reader-specific derived tokens */
  --toolbar-h:60px;
  --panel-w:320px;
  --page-shadow:0 18px 40px -16px rgba(11,31,59,.45);
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-flip:cubic-bezier(.36,.06,.16,1);   /* weighty page-turn arc */
  --flip-ms:680ms;
}

/* ---------- Reset / base ------------------------------------------------- */
*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  font:15px/1.55 'Segoe UI','Helvetica Neue',Arial,sans-serif;
  color:var(--ink);
  background:var(--bg-soft);
  -webkit-font-smoothing:antialiased;
  overflow:hidden;
}
button{font:inherit;color:inherit;cursor:pointer;}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:6px;}

/* Screen-reader-only text */
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0;
}

/* ---------- App shell ---------------------------------------------------- */
.reader{
  display:flex;flex-direction:column;
  height:100vh;height:100dvh;width:100%;
  background:var(--bg-soft);
}

/* ---------- Top toolbar -------------------------------------------------- */
.toolbar{
  height:var(--toolbar-h);flex:0 0 var(--toolbar-h);
  display:flex;align-items:center;gap:6px;
  padding:0 14px;
  background:var(--navy);color:#fff;
  box-shadow:0 2px 14px -6px rgba(11,31,59,.6);
  z-index:40;position:relative;
  transition:transform .35s var(--ease),opacity .35s var(--ease);
}
.toolbar .brand{
  display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.02em;
  margin-right:6px;white-space:nowrap;
  text-decoration:none;color:inherit;cursor:pointer;
}
.toolbar .brand svg{width:30px;height:30px;flex:0 0 30px;}
.toolbar .brand .name{font-size:15px;}
.toolbar .brand .name b{color:var(--gold);}
.toolbar .title{
  font-size:13px;color:#cdd7e6;max-width:26ch;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.toolbar .spacer{flex:1 1 auto;}

.tgroup[hidden]{display:none;}   /* display:flex below is an author rule and would otherwise beat the UA [hidden] default — e.g. #installGroup would show on every load, not just when installable */
.tgroup{display:flex;align-items:center;gap:2px;}
.tgroup + .tgroup{margin-left:6px;padding-left:8px;border-left:1px solid rgba(255,255,255,.14);}

.tbtn[hidden]{display:none;}   /* .tbtn's own display:inline-flex below is an author rule and would otherwise beat the UA [hidden] default */
.tbtn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-width:38px;height:38px;padding:0 9px;
  background:transparent;border:0;border-radius:10px;color:#eaf0f8;
  transition:background .18s var(--ease),color .18s var(--ease),transform .12s var(--ease);
  text-decoration:none;cursor:pointer;
}
.tbtn svg{width:19px;height:19px;pointer-events:none;}
.tbtn:hover{background:rgba(255,255,255,.12);}
.tbtn:active{transform:translateY(1px);}
.tbtn[aria-pressed="true"],.tbtn.active{background:var(--gold);color:var(--navy);}
.tbtn[disabled]{opacity:.35;cursor:not-allowed;}
.tbtn .lbl{font-size:13px;font-weight:600;}

.pagebox{
  display:flex;align-items:center;gap:6px;font-size:13px;color:#cdd7e6;
  padding:4px 12px;white-space:nowrap;
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.15);border-radius:22px;
}
.pagebox input{
  width:52px;height:32px;text-align:center;border-radius:8px;border:1px solid rgba(255,255,255,.2);
  background:rgba(255,255,255,.08);color:#fff;font:inherit;
}
.zoomlabel{min-width:46px;text-align:center;font-variant-numeric:tabular-nums;font-size:13px;color:#cdd7e6;}

/* ---------- Main stage --------------------------------------------------- */
.stage-wrap{position:relative;flex:1 1 auto;min-height:0;display:flex;}
.stage{
  position:relative;flex:1 1 auto;min-width:0;max-width:none;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
  background:
    radial-gradient(120% 85% at 50% -4%, #1a2b47 0%, #0d1c33 52%, #071120 100%);
  perspective:2600px;
  touch-action:none;
}
/* soft museum spotlight above the book */
.stage::after{
  content:"";position:absolute;left:50%;top:-8%;width:70%;height:60%;transform:translateX(-50%);
  background:radial-gradient(closest-side, rgba(255,251,240,.16), rgba(255,251,240,0));
  pointer-events:none;filter:blur(8px);z-index:0;
}
.stage.grabbing{cursor:grabbing;}

/* Zoom / pan viewport wrapper (transform applied here) */
.viewport{
  position:relative;
  transform-origin:center center;
  transition:transform .28s var(--ease);
  will-change:transform;
}
.viewport.panning{transition:none;}

/* ---------- The book ----------------------------------------------------- */
/* .book holds the 3D leaves. It can spin 360° (cover tour) around Y. */
.book{
  position:relative;
  transform-style:preserve-3d;
  transition:transform var(--flip-ms) var(--ease);
  will-change:transform;
}
.book.spin-anim{transition:transform 1400ms var(--ease);}

/* A leaf = one physical page. Bound at its left edge; flips reveal the next. */
.leaf{
  position:absolute;top:0;left:0;
  transform-style:preserve-3d;
  transform-origin:left center;
  will-change:transform;
  transition:transform var(--flip-ms) var(--ease-flip);
  backface-visibility:hidden;
}
.leaf.dragging{transition:none;}

.face{
  position:absolute;top:0;left:0;width:100%;height:100%;
  backface-visibility:hidden;
  background:#fff;
  overflow:hidden;
  box-shadow:var(--page-shadow);
  border-radius:2px 6px 6px 2px;
}
.face.back{transform:rotateY(180deg);border-radius:6px 2px 2px 6px;}

/* Paper texture + inner gutter shading for realism */
.face::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(90deg, rgba(11,31,59,.10) 0, rgba(11,31,59,0) 6%);
  z-index:3;
}
.face.back::before{background:linear-gradient(-90deg, rgba(11,31,59,.10) 0, rgba(11,31,59,0) 6%);}

/* Dynamic curl/turn shadow overlay used while flipping.
   Intensity is driven by --curl (0→1) so it deepens through the turn. */
.face .curl{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:4;
  background:
    linear-gradient(90deg, rgba(11,31,59,.28) 0%, rgba(11,31,59,.05) 14%, rgba(0,0,0,0) 42%),
    linear-gradient(270deg, rgba(11,31,59,.20) 0%, rgba(0,0,0,0) 30%);
  opacity:0;transition:opacity .25s var(--ease);
}
.leaf.dragging .face .curl,.leaf.turning .face .curl{opacity:var(--curl, .85);}

/* The turning leaf lifts off the stack with a soft cast shadow + sheen. */
.leaf.turning,.leaf.dragging{
  box-shadow:0 30px 60px -24px rgba(11,31,59,.55);
}
.leaf.turning .face,.leaf.dragging .face{
  box-shadow:var(--page-shadow), 0 0 40px -10px rgba(11,31,59,.35);
}

/* The rendered page content scroller inside a face */
.page-content{
  position:absolute;inset:0;overflow:hidden;
  padding:0;
}
.page-content .paper{
  width:100%;height:100%;overflow:hidden;position:relative;
  background:#fff;
  container-type:inline-size;
}
/* Inner page margins — must match the Paginator measurer padding exactly so
   the on-screen page holds the same amount of text it was measured for. */
.page-content .paper .pgflow{
  padding:30px 34px;box-sizing:border-box;height:100%;overflow:hidden;
}
/* ── Pages rendered straight from the book's own EPUB ────────────────────
   Each section keeps its original stylesheet, so we supply only the page box.
   Source stylesheets are written for a scrolling window, so a cover sized
   "max-height:80vh" would float in the middle of a fixed page — hence the
   full-bleed override for image-only pages below. */
.page-content .paper .pgflow:has(> .epub-leaf){padding:0;}
.epub-leaf{
  height:100%;width:100%;overflow:hidden;box-sizing:border-box;padding:6% 7%;
}
.epub-leaf > *:first-child{margin-top:0;}
.epub-leaf img{max-width:100%;height:auto;}

/* Full-bleed image pages (cover, divider photos) — flagged deterministically
   server-side by EpubBook::sectionIsFullBleedImage(), not guessed here from
   how deeply each book happens to nest its <img>. Every wrapper between the
   leaf and the image is neutralised so the book's own (scrolling-page) CSS
   can't keep the artwork small or centered in a fixed leaf. */
.epub-leaf[data-fullbleed="1"]{padding:0;}
.epub-leaf[data-fullbleed="1"] :not(style):not(script){
  margin:0;padding:0;display:block;
  width:100%;height:100%;max-width:none;max-height:none;
}
.epub-leaf[data-fullbleed="1"] style,
.epub-leaf[data-fullbleed="1"] script{display:none;}
.epub-leaf[data-fullbleed="1"] img{
  object-fit:cover;object-position:center;
}

/* Cover / full-bleed pages fill edge-to-edge with no page margin — that's
   for full-bleed cover IMAGES. Text-only covers (title, subtitle, imprint)
   need their own inset so long titles can't run past the page edge; a book
   with a real trim size narrower than the old generic default made this an
   actual bug (clipped titles), not just a defensive style. */
.page-content .paper .pgflow:has(> .cover){padding:0;}
.page-content .paper .pgflow > .cover{
  height:100%;box-sizing:border-box;padding:0 8%;
  max-width:100%;overflow-wrap:break-word;word-break:break-word;
}
.page-content .paper .pgflow > .cover h1{
  max-width:100%;overflow-wrap:break-word;word-break:break-word;
  font-size:clamp(15pt,7.5cqw,28pt);
}
.page-content .paper .pgflow > .cover .sub{max-width:100%;overflow-wrap:break-word;}
/* Cover pages built as a single full-bleed image (a <img> as the only or
   first child) should still go fully edge-to-edge — undo the text inset. */
.page-content .paper .pgflow > .cover:has(> img:only-child),
.page-content .paper .pgflow > .cover:has(> p:only-child > img:only-child){
  padding:0;
}
/* Full-page artwork (lookbook / gallery previews) — image fills the page. */
.page-content .paper .pgflow:has(> .fullpage){padding:0;}
.page-content .paper .pgflow > .fullpage{
  height:100%;display:flex;align-items:center;justify-content:center;background:#fff;
}
.page-content .paper .pgflow > .fullpage img{max-width:100%;max-height:100%;object-fit:contain;}
/* Two-page spread layout */
.book.spread-mode{display:flex;}
.book.spread-mode .leaf{position:relative;left:auto;top:auto;}
.book.spread-mode .leaf .face{box-shadow:none;}
.book.spread-mode .leaf.right .face{box-shadow:var(--page-shadow);border-radius:2px 6px 6px 2px;}
.book.spread-mode .leaf.left  .face{box-shadow:var(--page-shadow);border-radius:6px 2px 2px 6px;}

/* Page number badge */
.page-num{
  position:absolute;bottom:10px;font-size:11px;color:var(--ink-soft);
  z-index:5;font-variant-numeric:tabular-nums;
}
.face:not(.back) .page-num{right:16px;}
.face.back  .page-num{left:16px;}

/* Cover styling (first leaf front) */
.face.cover{
  background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 100%);
  color:#fff;display:flex;align-items:center;justify-content:center;
}
.face.cover::after{
  content:"";position:absolute;left:0;top:0;bottom:0;width:14px;
  background:linear-gradient(90deg, rgba(255,255,255,.14), rgba(255,255,255,0));
}

/* Spine plate shown during 360° tour */
.spine{
  position:absolute;top:0;left:50%;height:100%;
  transform-origin:left center;
  background:linear-gradient(90deg,#081729,#0e2647);
  display:flex;align-items:center;justify-content:center;
  color:var(--gold-soft);
  writing-mode:vertical-rl;text-orientation:mixed;
  font-weight:700;letter-spacing:.14em;text-transform:uppercase;font-size:12px;
  box-shadow:inset -6px 0 14px -8px rgba(0,0,0,.6);
  backface-visibility:hidden;
}

/* Loading / empty states */
.stage-msg{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:14px;color:var(--ink-soft);z-index:20;
}
.stage-msg .spinner{
  width:42px;height:42px;border-radius:50%;
  border:3px solid var(--line);border-top-color:var(--gold);
  animation:spin 1s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}

/* Edge hot-zones for click-to-flip */
.edge{
  position:absolute;top:0;bottom:0;width:11%;max-width:120px;z-index:15;
  cursor:pointer;background:transparent;border:0;
}
.edge.left{left:0;}
.edge.right{right:0;}
.edge:hover{background:linear-gradient(90deg,rgba(11,31,59,.06),transparent);}
.edge.right:hover{background:linear-gradient(-90deg,rgba(11,31,59,.06),transparent);}

/* Floating prev/next arrows */
.nav-arrow{
  position:absolute;top:50%;transform:translateY(-50%);z-index:16;
  width:46px;height:46px;border-radius:50%;border:1px solid var(--line);
  background:rgba(255,255,255,.9);color:var(--navy);
  display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-card);backdrop-filter:blur(4px);
  transition:transform .16s var(--ease),background .16s var(--ease),opacity .2s var(--ease);
}
.nav-arrow:hover{background:#fff;transform:translateY(-50%) scale(1.06);}
.nav-arrow svg{width:22px;height:22px;}
.nav-arrow.prev{left:16px;}
.nav-arrow.next{right:16px;}
.nav-arrow[disabled]{opacity:0;pointer-events:none;}

/* ---------- Side panels (TOC / thumbs / bookmarks / notes / search) ------ */
.panel{
  position:absolute;top:0;bottom:0;left:0;width:var(--panel-w);max-width:86vw;
  background:var(--bg);border-right:1px solid var(--line);
  box-shadow:8px 0 30px -20px rgba(11,31,59,.5);
  transform:translateX(-102%);transition:transform .32s var(--ease);
  z-index:30;display:flex;flex-direction:column;
}
.panel.open{transform:translateX(0);}
.panel-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;border-bottom:1px solid var(--line);
}
.panel-head h2{margin:0;font-size:15px;color:var(--navy);letter-spacing:.01em;}
.panel-head .close{
  width:34px;height:34px;border-radius:9px;border:0;background:var(--bg-soft);
  display:flex;align-items:center;justify-content:center;color:var(--ink-soft);
}
.panel-head .close:hover{background:var(--line);}
.panel-body{flex:1 1 auto;overflow-y:auto;padding:10px 12px;}

/* TOC */
.toc-item{
  display:block;width:100%;text-align:left;padding:9px 12px;border-radius:10px;
  border:0;background:transparent;color:var(--ink);font-size:14px;margin-bottom:2px;
}
.toc-item:hover{background:var(--bg-soft);}
.toc-item.active{background:var(--gold-soft);color:var(--gold-text);font-weight:600;}
.toc-item.lvl2{padding-left:26px;font-size:13px;color:var(--ink-soft);}

/* Thumbnails */
.thumbs{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;}
.thumb{
  position:relative;border:1px solid var(--line);border-radius:8px;overflow:hidden;
  background:#fff;aspect-ratio:1/1.414;cursor:pointer;padding:0;
  transition:border-color .16s var(--ease),transform .16s var(--ease),box-shadow .16s var(--ease);
}
.thumb:hover{transform:translateY(-2px);box-shadow:var(--shadow-card);}
.thumb.active{border-color:var(--gold);box-shadow:0 0 0 2px var(--gold-soft);}
.thumb .mini{
  position:absolute;inset:0;overflow:hidden;transform-origin:top left;background:#fff;
}
.thumb .tn{
  position:absolute;bottom:0;left:0;right:0;font-size:10px;text-align:center;
  background:rgba(11,31,59,.72);color:#fff;padding:2px 0;
}

/* Bookmarks & notes lists */
.list-empty{color:var(--ink-soft);font-size:13px;text-align:center;padding:26px 10px;}
.rowcard{
  display:flex;align-items:flex-start;gap:10px;padding:10px 12px;border-radius:10px;
  border:1px solid var(--line);margin-bottom:8px;background:#fff;
}
.rowcard .go{flex:1 1 auto;text-align:left;border:0;background:transparent;padding:0;}
.rowcard .go .p{font-size:12px;color:var(--gold-text);font-weight:600;}
.rowcard .go .t{font-size:13px;color:var(--ink);margin-top:2px;}
.rowcard .swatch{width:12px;height:12px;border-radius:3px;flex:0 0 12px;margin-top:4px;}
.rowcard .del{border:0;background:transparent;color:var(--ink-soft);width:26px;height:26px;border-radius:7px;}
.rowcard .del:hover{background:var(--bg-soft);color:#c0392b;}

/* Search box */
.searchbar{display:flex;gap:8px;padding:12px;border-bottom:1px solid var(--line);}
.searchbar input{
  flex:1 1 auto;height:38px;border:1px solid var(--line);border-radius:10px;padding:0 12px;font:inherit;
}
.searchbar button{
  height:38px;padding:0 14px;border-radius:10px;border:0;background:var(--navy);color:#fff;font-weight:600;
}
.search-count{padding:8px 14px;font-size:12px;color:var(--ink-soft);border-bottom:1px solid var(--line);}
.search-hit{
  display:block;width:100%;text-align:left;border:0;background:transparent;
  padding:10px 12px;border-radius:10px;font-size:13px;color:var(--ink);margin-bottom:2px;
}
.search-hit:hover{background:var(--bg-soft);}
.search-hit .p{font-size:11px;color:var(--gold-text);font-weight:600;}
.search-hit mark{background:var(--gold-soft);color:var(--gold-text);padding:0 2px;border-radius:3px;}

/* In-page search highlight + selection highlights */
mark.reader-hl{background:#ffe9a8;color:inherit;border-radius:2px;}
mark.reader-hl.current{background:var(--orange);color:#fff;}
.user-hl{border-radius:2px;padding:0 1px;cursor:pointer;}

/* ---------- Selection popover (highlight / note) ------------------------- */
.sel-pop{
  position:absolute;z-index:60;display:none;
  background:var(--navy);color:#fff;border-radius:12px;padding:8px;gap:6px;
  box-shadow:var(--shadow-card);align-items:center;
}
.sel-pop.show{display:flex;}
.sel-pop .color{width:24px;height:24px;border-radius:6px;border:2px solid rgba(255,255,255,.4);cursor:pointer;}
.sel-pop .color.sel{border-color:#fff;transform:scale(1.08);}
.sel-pop .act{border:0;background:rgba(255,255,255,.14);color:#fff;height:28px;padding:0 10px;border-radius:8px;font-size:12px;}
.sel-pop .act:hover{background:rgba(255,255,255,.26);}

/* Note editor dialog */
.note-dialog{
  position:absolute;z-index:70;width:280px;background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow-card);border:1px solid var(--line);padding:14px;display:none;
}
.note-dialog.show{display:block;}
.note-dialog textarea{
  width:100%;min-height:88px;resize:vertical;border:1px solid var(--line);border-radius:10px;
  padding:10px;font:inherit;
}
.note-dialog .row{display:flex;justify-content:flex-end;gap:8px;margin-top:10px;}
.note-dialog .row button{height:34px;padding:0 14px;border-radius:9px;border:0;font-weight:600;}
.note-dialog .save{background:var(--navy);color:#fff;}
.note-dialog .cancel{background:var(--bg-soft);color:var(--ink);}

/* ---------- Bottom bar: dark floating control pill ------------------------ */
.bottombar{
  position:relative;z-index:35;flex:0 0 auto;
  display:flex;align-items:center;gap:10px;
  width:max-content;max-width:calc(100% - 24px);margin:0 auto 14px;padding:8px 14px;
  background:rgba(9,20,37,.94);border:1px solid rgba(255,255,255,.12);border-radius:32px;
  box-shadow:0 14px 34px -16px rgba(0,0,0,.7);backdrop-filter:blur(8px);
  transition:transform .35s var(--ease),opacity .35s var(--ease);
}
.bottombar .bbtn{
  width:38px;height:38px;border-radius:50%;border:0;background:transparent;color:#eaf0f8;
  display:flex;align-items:center;justify-content:center;transition:background .16s var(--ease);
}
.bottombar .bbtn:hover{background:rgba(255,255,255,.12);}
.bottombar .bbtn[disabled]{opacity:.32;cursor:not-allowed;}
.bottombar .bbtn svg{width:19px;height:19px;}
.slider{width:clamp(120px,30vw,260px);flex:0 0 auto;-webkit-appearance:none;appearance:none;height:5px;border-radius:6px;background:rgba(255,255,255,.18);}
.slider::-webkit-slider-thumb{
  -webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--gold);
  box-shadow:0 2px 6px -1px rgba(0,0,0,.5);cursor:pointer;border:2px solid #fff;
}
.slider::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:var(--gold);border:2px solid #fff;cursor:pointer;}
.bottombar .count{font-size:12px;color:#cdd7e6;white-space:nowrap;font-variant-numeric:tabular-nums;padding:0 4px;}

/* ---------- Fullscreen / immersive --------------------------------------- */
.reader.immersive .toolbar{transform:translateY(-100%);opacity:0;pointer-events:none;}
.reader.immersive .bottombar{transform:translateY(100%);opacity:0;pointer-events:none;}
.reader.immersive .stage{background:radial-gradient(120% 85% at 50% 0%, #16273f, #060f1d);}
.immersive-exit{
  position:absolute;top:14px;right:14px;z-index:50;display:none;
  width:42px;height:42px;border-radius:50%;border:0;background:rgba(11,31,59,.86);color:#fff;
  align-items:center;justify-content:center;box-shadow:var(--shadow-card);
}
.reader.immersive .immersive-exit{display:flex;}

/* Scrim for panels on mobile */
.scrim{
  position:absolute;inset:0;background:rgba(11,31,59,.32);z-index:25;opacity:0;
  pointer-events:none;transition:opacity .3s var(--ease);
}
.scrim.show{opacity:1;pointer-events:auto;}

/* ---------- Responsive --------------------------------------------------- */
@media (max-width:900px){
  .toolbar .brand .name,.toolbar .title{display:none;}
  .tbtn .lbl{display:none;}
  :root{--panel-w:300px;}
}
@media (max-width:620px){
  :root{--toolbar-h:54px;}
  .tgroup.optional{display:none;}         /* hide secondary groups on small screens */
  .nav-arrow{width:40px;height:40px;}
  .bottombar{padding:8px 12px;gap:10px;}
}

/* ---------- Reduced motion ----------------------------------------------- */
@media (prefers-reduced-motion:reduce){
  .book,.leaf,.face,.viewport,.panel,.toolbar,.bottombar,.nav-arrow{transition-duration:.01ms !important;}
  .book.spin-anim{transition-duration:.01ms !important;}
  .spinner{animation-duration:1.4s;}
}