:root{
  --night:#140a2c; --surf:#1d0f42; --surf2:#28165c; --line:#3a2482;
  --ink:#f6f1ff; --mute:#b8a7e8; --neon:#eeff41; --on-neon:#1a0b33;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--night);color:var(--ink);font-family:'Nunito',system-ui,sans-serif;overflow:hidden;
  -webkit-tap-highlight-color:transparent;overscroll-behavior:none}
#scene{position:fixed;inset:0;width:100vw;height:100vh;display:block;touch-action:none}
button{font:inherit;color:inherit}
svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}

.ui{position:fixed;inset:0;pointer-events:none}
.bar{position:absolute;left:0;right:0;top:0;display:flex;align-items:center;gap:10px;
  padding:max(12px,env(safe-area-inset-top)) 14px 12px;
  background:linear-gradient(var(--night) 30%,rgba(20,10,44,0))}
.bar>*{pointer-events:auto}
.ibtn{width:44px;height:44px;flex:none;display:grid;place-items:center;border-radius:14px;border:1px solid var(--line);
  background:rgba(29,15,66,.85);color:var(--ink);cursor:pointer;text-decoration:none}
.ibtn:hover{border-color:var(--neon)}
.ref{flex:1;min-width:0;height:44px;display:flex;align-items:center;justify-content:center;gap:6px;border-radius:14px;
  border:1px solid var(--line);background:rgba(29,15,66,.85);cursor:pointer;
  font:600 1.15rem 'Fredoka',sans-serif;letter-spacing:.01em}
.ref span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ref svg{width:18px;height:18px;color:var(--neon)}

.turns{position:absolute;left:0;right:0;bottom:0;display:flex;justify-content:space-between;
  padding:12px 16px max(16px,env(safe-area-inset-bottom));opacity:0;transition:opacity .4s}
.ui.is-open .turns{opacity:1}
.turn{pointer-events:auto;width:58px;height:58px;border-radius:50%;border:0;display:grid;place-items:center;cursor:pointer;
  background:var(--neon);color:var(--on-neon);box-shadow:0 8px 24px rgba(0,0,0,.45)}
.turn svg{width:26px;height:26px;stroke-width:3}
.ui:not(.is-open) .turn{pointer-events:none}

.open-hint{position:absolute;left:50%;bottom:max(34px,env(safe-area-inset-bottom));transform:translateX(-50%);margin:0;
  padding:12px 22px;border-radius:99px;background:var(--neon);color:var(--on-neon);font:600 1.1rem 'Fredoka',sans-serif;
  box-shadow:0 0 30px rgba(238,255,65,.35);animation:pulse 2.2s ease-in-out infinite;white-space:nowrap}
@keyframes pulse{50%{transform:translateX(-50%) scale(1.05)}}

.loading{position:fixed;inset:0;display:grid;place-content:center;gap:14px;text-align:center;background:var(--night);
  font:600 1.2rem 'Fredoka',sans-serif;z-index:5}
.loading[hidden],.open-hint[hidden]{display:none}
.loading a{color:var(--neon)}
.bar-track{width:220px;height:6px;border-radius:9px;background:var(--surf2);overflow:hidden;margin:0 auto}
.bar-fill{height:100%;width:0;background:var(--neon);transition:width .2s}

.sheet{position:fixed;inset:0;z-index:10;background:rgba(8,3,20,.6);display:flex;align-items:flex-end;justify-content:center}
.sheet[hidden]{display:none}
.sheet__card{width:min(640px,100%);max-height:82vh;display:flex;flex-direction:column;background:var(--surf);
  border:1px solid var(--line);border-radius:24px 24px 0 0;padding:14px 16px max(16px,env(safe-area-inset-bottom))}
@media (min-width:700px){.sheet{align-items:center}.sheet__card{border-radius:24px}}
.sheet__card header{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.sheet__card h2{flex:1;margin:0;font:600 1.4rem 'Fredoka',sans-serif}
#q{flex:1;height:48px;border-radius:14px;border:1px solid var(--line);background:var(--night);color:var(--ink);
  padding:0 14px;font:700 1.05rem 'Nunito',sans-serif;outline:none}
#q:focus{border-color:var(--neon)}
.books,.results{overflow:auto;padding-bottom:6px}
.books h3{margin:12px 2px 8px;font:800 .78rem 'Nunito',sans-serif;letter-spacing:.14em;text-transform:uppercase;color:var(--mute)}
.books{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:8px;align-content:start}
.books h3,.books .chs,.bk--back{grid-column:1/-1}
.bk{min-height:46px;border-radius:12px;border:1px solid var(--line);background:var(--surf2);cursor:pointer;
  font:700 .98rem 'Nunito',sans-serif;padding:6px 10px;text-align:left}
.bk:hover,.ch:hover{border-color:var(--neon)}
.bk--back{background:transparent;color:var(--neon);border:0;text-align:left;padding-left:2px}
.chs{display:grid;grid-template-columns:repeat(auto-fill,minmax(54px,1fr));gap:8px}
.ch{height:52px;border-radius:12px;border:1px solid var(--line);background:var(--surf2);cursor:pointer;font:600 1.1rem 'Fredoka',sans-serif}
.res{display:block;width:100%;text-align:left;border:0;border-bottom:1px solid var(--line);background:none;padding:12px 4px;cursor:pointer}
.res b{display:block;font:600 1.05rem 'Fredoka',sans-serif;color:var(--neon);margin-bottom:3px}
.res span{display:block;font-size:.95rem;line-height:1.45;color:var(--mute)}
.res mark{background:var(--neon);color:var(--on-neon);border-radius:3px;padding:0 2px}
.hint{color:var(--mute);margin:12px 4px}

/* highlighter toolbar */
.hlbar{position:absolute;left:50%;bottom:calc(max(16px,env(safe-area-inset-bottom)) + 74px);transform:translateX(-50%);pointer-events:auto;
  width:min(440px,calc(100% - 24px));background:rgba(29,15,66,.96);border:1px solid var(--line);border-radius:22px;padding:12px 14px 14px;
  box-shadow:0 16px 40px rgba(0,0,0,.5)}
.hlbar[hidden]{display:none}
.hlbar__top{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.hlbar__top b{font:600 1.1rem 'Fredoka',sans-serif}
.hlx{width:36px;height:36px;border-radius:12px;border:1px solid var(--line);background:transparent;display:grid;place-items:center;cursor:pointer}
.hlbar__row{display:flex;justify-content:space-between;gap:8px}
.pen{flex:1;height:46px;border-radius:14px;border:2px solid rgba(255,255,255,.15);cursor:pointer;
  background:linear-gradient(160deg,var(--c),color-mix(in srgb,var(--c) 70%,#000));box-shadow:inset 0 -6px 0 rgba(0,0,0,.15)}
.pen:hover,.pen:focus-visible{border-color:var(--neon);outline:none}
.hlbar__acts{margin-top:10px}
.act{flex:1;height:44px;border-radius:14px;border:1px solid var(--line);background:var(--surf2);cursor:pointer;font:700 .98rem 'Nunito',sans-serif}
.act[hidden]{display:none}
.toast{position:absolute;left:50%;top:84px;transform:translateX(-50%);margin:0;padding:10px 18px;border-radius:99px;
  background:var(--neon);color:var(--on-neon);font:700 1rem 'Nunito',sans-serif}
.toast[hidden]{display:none}
.hl-res b{color:var(--ink)}
.hl-res{border-left:6px solid var(--hl);padding-left:12px;margin-bottom:2px}

/* reading settings */
.ibtn--aa span{font:700 1.15rem 'Fredoka',sans-serif;letter-spacing:.02em}
.set-label{margin:6px 2px 8px;font:800 .8rem 'Nunito',sans-serif;letter-spacing:.14em;text-transform:uppercase;color:var(--mute)}
.seg{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin-bottom:14px}
.seg button{min-height:84px;border-radius:16px;border:2px solid var(--line);background:var(--surf2);cursor:pointer;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;font:700 1rem 'Nunito',sans-serif}
.seg button span{font-family:'EB Garamond',serif;font-weight:600;line-height:1}
.seg button[aria-pressed="true"]{border-color:var(--neon);background:#3a1f7a}
#pagesRow[hidden]{display:none}
.seg--gfx button{min-height:70px;padding:6px 8px;text-align:center}
.seg--gfx button b{font-size:1.1rem}
.seg--gfx button small{font-weight:600;font-size:.8rem;opacity:.8;line-height:1.2}

/* narration */
.turns{align-items:center}
.listen{pointer-events:auto;height:52px;padding:0 22px 0 8px;border-radius:99px;border:1px solid var(--line);cursor:pointer;
  display:flex;align-items:center;gap:10px;background:rgba(29,15,66,.92);font:600 1.1rem 'Fredoka',sans-serif;
  box-shadow:0 8px 24px rgba(0,0,0,.45);max-width:calc(100% - 160px)}
.listen #listenText{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.listen__icon{width:38px;height:38px;flex:none;border-radius:50%;display:grid;place-items:center;background:var(--neon);color:var(--on-neon);font-size:.95rem}
.listen.is-on{border-color:var(--neon);box-shadow:0 0 22px rgba(238,255,65,.3)}
.ui:not(.is-open) .listen{pointer-events:none}
.act--notes{background:var(--neon);color:var(--on-neon);border-color:var(--neon)}

/* reading dot: round play button beside the line being read */
.rdot{position:fixed;left:0;top:0;z-index:6;width:56px;height:56px;padding:0;border-radius:50%;border:3px solid #fff;
  background:var(--neon);color:var(--on-neon);display:grid;place-items:center;font:700 1.3rem 'Fredoka',sans-serif;cursor:grab;
  touch-action:none;pointer-events:auto;user-select:none;-webkit-user-select:none;will-change:transform;
  box-shadow:0 6px 18px rgba(0,0,0,.55),0 0 0 6px rgba(238,255,65,.2);transition:transform .2s ease-out}
.rdot[hidden]{display:none}
.rdot.is-drag{cursor:grabbing;transition:transform .07s linear;box-shadow:0 10px 26px rgba(0,0,0,.6),0 0 0 10px rgba(238,255,65,.3)}
.rdot.is-on::after{content:'';position:absolute;inset:-9px;border-radius:50%;border:3px solid var(--neon);pointer-events:none;animation:rdotPulse 1.7s ease-out infinite}
@keyframes rdotPulse{from{opacity:.85;transform:scale(.82)}to{opacity:0;transform:scale(1.35)}}
.rdot:focus-visible{outline:3px solid #fff;outline-offset:4px}
.rdot b{position:absolute;bottom:calc(100% + 10px);white-space:nowrap;font:700 1.05rem 'Fredoka',sans-serif;background:rgba(18,8,40,.96);
  color:#fff;border:2px solid var(--neon);padding:5px 12px;border-radius:99px;pointer-events:none}
.rdot--left b{left:-4px}
.rdot--right b{right:-4px}
.rdot b[hidden]{display:none}
@media (max-width:520px){.rdot{width:44px;height:44px;font-size:1.05rem;border-width:2px}}
.act--read{background:var(--surf2)}
.ibtn--bg{font-size:1.15rem}
@media (max-width:420px){.bar{gap:6px;padding-left:10px;padding-right:10px}.ibtn{width:40px;height:40px}}
.bgpick{width:100%;min-height:56px;margin-bottom:14px;border-radius:16px;border:2px solid var(--line);background:var(--surf2);cursor:pointer;font:700 1.05rem 'Fredoka',sans-serif;color:var(--ink)}
.bgpick:hover{border-color:var(--neon)}
#bgSheet{z-index:12}