:root{
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
  --bg:#e9dfc8; --page:#fffaf0; --ink:#2b2218; --muted:#7a6a55;
  --accent:#0f6b4f; --accent-ink:#ffffff; --card:#f3e8cf; --line:#dccdaa;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#1b1812; --page:#2a251c; --ink:#f3ead8; --muted:#b9a98c;
    --accent:#3fbf94; --accent-ink:#0c1a14; --card:#3a3226; --line:#4a4132;
    color-scheme:dark;
  }
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Nunito',system-ui,sans-serif;
  min-height:100vh;display:flex;align-items:center;justify-content:center;padding:16px}

.book{width:100%;max-width:1040px}
.pages{display:grid;perspective:2400px}
.page{grid-area:1/1;background:var(--page);border:1px solid var(--line);border-radius:20px;
  box-shadow:0 14px 40px rgba(0,0,0,.18);padding:22px 26px 26px;
  transform-origin:left center;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  transition:transform .9s cubic-bezier(.45,.05,.2,1),box-shadow .9s;}
.page.flipped{transform:rotateY(-180deg);pointer-events:none;box-shadow:none}

.cover{display:grid;place-items:center;overflow:hidden;text-align:center;
  background:radial-gradient(ellipse at center,var(--card) 0%,var(--page) 72%)}
.cover-content{padding:32px 16px}
.cover-kicker{color:var(--accent);font-size:.85rem;font-weight:800;letter-spacing:.18em;margin:0 0 24px}
.cover-arabic{font-family:'Amiri',serif;font-size:clamp(3.5rem,10vw,6rem);line-height:1.2;color:var(--accent);margin:0 0 12px}
.cover-title{font-size:clamp(2rem,7vw,4rem);line-height:1.15;margin:0}
.cover-stage{width:min(280px,60vw);height:190px;aspect-ratio:auto;max-height:none;margin:4px auto}
.cover-subtitle{color:var(--muted);font-size:clamp(1rem,3vw,1.25rem);margin:16px 0 0}
.cover-count{display:inline-block;margin:28px 0 0;padding:8px 18px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-weight:800}

.head{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:.85rem;margin-bottom:10px}
.head b{color:var(--accent)}
.grid{display:grid;grid-template-columns:0.7fr 1.5fr;gap:24px;align-items:center}
.left{text-align:center}
.letter{font-family:'Amiri',serif;font-size:clamp(90px,15vw,150px);line-height:1.15;color:var(--accent);margin:0}
.name{font-weight:800;font-size:1.1rem;margin:0}
.hint{color:var(--muted);font-size:.88rem;margin:4px 0 0}
.stage{position:relative;width:100%;aspect-ratio:1/1;max-height:520px;border-radius:20px;cursor:grab;touch-action:pan-y;overflow:hidden;
  background:radial-gradient(circle at 50% 45%,var(--card) 0%,var(--page) 72%)}
.stage-placeholder{display:grid;place-items:center;padding:16px;color:var(--muted);text-align:center;cursor:default}
.stage-message{position:absolute;inset:0;display:grid;place-items:center;padding:16px;color:var(--muted);text-align:center;pointer-events:none}
.stage canvas{display:block;width:100%;height:100%}
.cap{color:var(--muted);font-size:.8rem;margin:4px 0 0;text-align:center}

.vocab{margin-top:16px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px 20px;
  display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.word{font-family:'Amiri',serif;font-size:2.6rem;line-height:1.2;margin:0}
.latin{font-weight:800;margin:0}
.mean{color:var(--muted);margin:0;font-size:.95rem}
.note{margin:10px 2px 0;color:var(--muted);font-size:.8rem;min-height:1.1em}

button{font:inherit;font-weight:800;border:0;border-radius:999px;cursor:pointer;display:inline-flex;gap:8px;align-items:center}
button:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.play{padding:13px 24px;background:var(--accent);color:var(--accent-ink)}
.play:active{transform:scale(.97)}
.play.playing{opacity:.75}

.nav{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:14px}
.nav-btn{padding:10px 18px;background:var(--page);color:var(--ink);border:1px solid var(--line)}
.nav-btn:disabled{opacity:.35;cursor:default}
.indicator{color:var(--muted);font-weight:700;font-size:.9rem}
.error{margin-top:12px;color:#b3261e;font-weight:700;text-align:center}

@media (max-width:700px){
  .grid{grid-template-columns:1fr;gap:10px}
  .left{order:2}
}
@media (prefers-reduced-motion: reduce){
  .page{transition:none}
}