/* =====================================================
   upgrade.css  (load AFTER main.css)
   1) gray + near-black palette  2) flippable books  3) design belt
   ===================================================== */

/* ---------- 1. palette ---------- */
:root{
  --paper:#F2F2F0;--card:#FFFFFF;--ink:#161616;--mute:#6B6B67;--line:#E1E1DD;
  --acc:#2B2B29;--sage:#E7E7E3;--sand:#ECECE8;--glass:rgba(255,255,255,.82);
  --shadow:rgba(20,20,20,.14);--cover:#1A1A1A;--band:#161616
}
:root[data-theme="dark"]{
  --paper:#141414;--card:#1D1D1D;--ink:#F1F1EE;--mute:#A2A29D;--line:#2D2D2D;
  --acc:#DADAD5;--sage:#242424;--sand:#292929;--glass:rgba(24,24,24,.85);
  --shadow:rgba(0,0,0,.55);--cover:#2A2A2A;--band:#1D1D1D
}
@media(prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#141414;--card:#1D1D1D;--ink:#F1F1EE;--mute:#A2A29D;--line:#2D2D2D;
    --acc:#DADAD5;--sage:#242424;--sand:#292929;--glass:rgba(24,24,24,.85);
    --shadow:rgba(0,0,0,.55);--cover:#2A2A2A;--band:#1D1D1D
  }
}
/* colours that were hard-coded brown in main.css */
.fc.dk,.portrait{background:var(--cover);border-color:var(--cover)}
.base,.lid,:root[data-theme="dark"] .base,:root[data-theme="dark"] .lid{background:var(--cover)}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]) .base,:root:not([data-theme="light"]) .lid{background:var(--cover)}}
.chip.dark{background:var(--cover);border-color:var(--cover);color:#F1F1EE}
.base em{color:#A2A29D}
.base .slot{background:#F1F1EE}

/* ---------- 2. books ---------- */
.mini{font-weight:500;margin-top:3.5rem}
.bookwrap{--pw:min(430px,44vw);--ph:calc(var(--pw)*1.12);margin-top:1.2rem}
.stage{position:relative;width:calc(var(--pw)*2);max-width:100%;height:var(--ph);margin:0 auto;perspective:2400px;touch-action:pan-y;outline-offset:12px}
.book{position:absolute;top:0;left:50%;width:var(--pw);height:var(--ph);transform-style:preserve-3d;transition:transform 1s cubic-bezier(.5,.1,.2,1)}
.book[data-state="closed"]{transform:translateX(calc(var(--pw)*-.5))}
.book[data-state="end"]{transform:translateX(calc(var(--pw)*.5))}
.leaf{position:absolute;inset:0;transform-style:preserve-3d;transform-origin:left center;cursor:pointer;
  transition:transform 1s cubic-bezier(.5,.1,.2,1),z-index 0s .5s}
.leaf.flipped{transform:rotateY(-180deg)}
.face{position:absolute;inset:0;overflow:hidden;background:var(--card);border:1px solid var(--line);
  -webkit-backface-visibility:hidden;backface-visibility:hidden;border-radius:3px 14px 14px 3px;box-shadow:0 14px 34px var(--shadow)}
.face.back{transform:rotateY(180deg);border-radius:14px 3px 3px 14px}
.face::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,rgba(0,0,0,.16),rgba(0,0,0,0) 11%)}
.face.back::after{background:linear-gradient(270deg,rgba(0,0,0,.16),rgba(0,0,0,0) 11%)}
.face:empty{background:var(--sand)}

.pg{height:100%;padding:1.5rem 1.5rem 1.4rem;display:flex;flex-direction:column;gap:.8rem}
.pg h3{font-size:1.45rem;font-weight:500}
.pg .d{color:var(--mute);font-size:.92rem;max-width:34ch}
.tg{display:flex;flex-wrap:wrap;gap:.35rem;list-style:none;padding:0}
.tg li{padding:.22rem .65rem;border-radius:99px;background:var(--sand);font-size:.74rem;font-weight:500}
.infopg .btn,.endpg .btn{align-self:flex-start;margin-top:auto}
.endpg .btn+.btn{margin-top:.5rem}
.soon{margin-top:auto;color:var(--mute);font-size:.82rem}
.cap{margin-top:auto;color:var(--mute);font-size:.8rem}

/* cover */
.cover{background:var(--cover);color:#F1F1EE;justify-content:flex-end;padding:2rem 1.8rem;position:relative}
.cover::before{content:"";position:absolute;left:16px;top:0;bottom:0;width:1px;background:rgba(255,255,255,.14)}
.cover .dot{width:10px;height:10px;border-radius:50%;background:var(--gold);margin-bottom:auto}
.cover h3{font-size:2.1rem;font-weight:500}
.cover p{color:#A2A29D;font-size:.9rem}
.cover em{font:normal 500 .8rem Manrope;color:#F1F1EE;opacity:.7;margin-top:.8rem}
.face:has(.cover){background:var(--cover);border-color:rgba(255,255,255,.08)}

/* screenshot frames */
.shotpg{justify-content:center;align-items:center;background:var(--sand)}
.shotbox{width:100%;border-radius:12px;overflow:hidden;background:var(--card);border:1px solid var(--line);box-shadow:0 18px 40px var(--shadow)}
.shotbox .bar{display:flex;gap:5px;padding:.55rem .7rem;background:var(--sand);border-bottom:1px solid var(--line)}
.shotbox .bar i{width:8px;height:8px;border-radius:50%;background:var(--line)}
.screen{position:relative;aspect-ratio:16/10;background:linear-gradient(135deg,var(--sand),var(--sage))}
.screen img{width:100%;height:100%;object-fit:cover;display:block}
.screen.noimg::after{content:attr(data-name);position:absolute;inset:0;display:grid;place-items:center;color:var(--mute);font:500 1rem 'Bricolage Grotesque',sans-serif}
.shotbox.phone{width:auto;height:78%;aspect-ratio:9/16;border-radius:26px;border:6px solid var(--cover)}
.shotbox.phone .screen{aspect-ratio:auto;height:100%}
.shotpg .cap{margin-top:0;position:absolute;bottom:1.2rem}

/* controls */
.bk-ctrl{display:flex;align-items:center;justify-content:center;gap:1rem;margin-top:1.6rem;color:var(--mute);font-size:.85rem}
.bk-ctrl button{width:44px;height:44px;border-radius:50%;border:1.5px solid var(--line);background:var(--card);color:var(--ink);font-size:1rem;cursor:pointer;transition:background .25s,color .25s,opacity .25s}
.bk-ctrl button:hover:not(:disabled){background:var(--ink);color:var(--paper)}
.bk-ctrl button:disabled{opacity:.35;cursor:default}
.bk-ctrl span{min-width:9ch;text-align:center}

@media(max-width:719px){
  .bookwrap{--pw:min(330px,84vw);--ph:calc(var(--pw)*1.62)}
  .stage{width:var(--pw)}
  .book{left:0}
  .pg{padding:1.1rem}
  .pg h3{font-size:1.25rem}
  .shotpg{background:var(--card)}
  .full .shotbox{flex:none}
  .full .shotbox.phone{height:210px;align-self:center}
  .full .cap{display:none}
}

/* ---------- 3. design belt ---------- */
.gallery{margin-top:7rem;padding:4.5rem 0;background:var(--band);color:#F1F1EE;overflow:hidden}
.gal-head{width:min(1160px,100% - 2.5rem);margin:0 auto 2.8rem;display:grid;gap:1rem;justify-items:start}
.gal-head h2{font-size:clamp(1.5rem,3.2vw,2.3rem);font-weight:500;max-width:20ch}
.gal-head p{color:#A2A29D;max-width:44ch}
.btn.light{background:#F1F1EE;color:#161616;border-color:#F1F1EE}
.btn.light:hover{background:var(--gold);border-color:var(--gold);color:#161616;transform:translateY(-3px)}
.belt{display:flex;gap:1rem;width:max-content;margin-top:1rem;animation:belt 70s linear infinite}
.belt.rev{animation-direction:reverse;animation-duration:85s}
.gallery:hover .belt{animation-play-state:paused}
.belt img{height:clamp(180px,22vw,270px);aspect-ratio:4/5;object-fit:cover;border-radius:12px;background:#2a2a2a}
@keyframes belt{to{transform:translateX(-50%)}}
@media(prefers-reduced-motion:reduce){.belt{animation:none!important}.leaf,.book{transition:none!important}}

/* ---------- book dragging ---------- */
.stage{user-select:none;-webkit-user-select:none}
.stage img{-webkit-user-drag:none}
.leaf{cursor:grab}.stage.dragging .leaf{cursor:grabbing}