:root{
    --french-navy:#071426; --navy-light:#0d2240; --accent-gold:#d4af37;
    --gold-hover:#e8c34f; --text-light:#fff;
    --font-title:'Playfair Display',serif; --font-body:'Montserrat',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
body{
    font-family:var(--font-body);
    background:var(--french-navy);
    background:radial-gradient(circle at 50% 0%, #0d2240 0%, #071426 70%);
    color:var(--text-light);
    min-height:100vh;
    display:flex; flex-direction:column; align-items:center;
    padding:1.5rem 1rem;
    overflow-x:hidden;
}
.book-title{
    font-family:var(--font-title); font-size:1.6rem; color:var(--accent-gold);
    text-align:center; margin-bottom:1rem; letter-spacing:.5px;
}
#flipbook-wrap{
    flex:1; display:flex; align-items:center; justify-content:center;
    width:100%; max-width:1100px; position:relative;
}
#flipbook{ touch-action:pan-y; }
#flipbook img{ width:100%; height:100%; display:block; -webkit-user-drag:none; user-select:none; pointer-events:none; }
.page{ background:#fff; box-shadow:0 0 20px rgba(0,0,0,.5); }
.page-loading{ display:flex; align-items:center; justify-content:center; background:#0d2240; color:#9ca3af; font-size:.85rem; }

/* Controles */
.controls{
    display:flex; align-items:center; gap:1.2rem; margin-top:1.5rem;
    background:rgba(13,34,64,.7); backdrop-filter:blur(8px);
    padding:.6rem 1.2rem; border-radius:999px; border:1px solid rgba(212,175,55,.25);
}
.btn{
    background:var(--accent-gold); color:var(--french-navy); border:none;
    width:42px; height:42px; border-radius:50%; cursor:pointer;
    font-size:1.1rem; font-weight:700; display:flex; align-items:center; justify-content:center;
    transition:background .2s, transform .2s;
}
.btn:hover{ background:var(--gold-hover); transform:scale(1.08); }
.btn:disabled{ opacity:.35; cursor:not-allowed; transform:none; }
.page-indicator{ font-size:.9rem; letter-spacing:1px; min-width:90px; text-align:center; }
.btn-text{
    background:transparent; border:1px solid rgba(255,255,255,.3); color:#fff;
    padding:.5rem 1rem; border-radius:999px; cursor:pointer; font-size:.8rem;
    font-family:var(--font-body); transition:background .2s,border-color .2s;
}
.btn-text:hover{ border-color:var(--accent-gold); background:rgba(255,255,255,.05); }

/* Estados de tela cheia */
.loading-screen,.error-screen{
    position:fixed; inset:0; display:flex; flex-direction:column;
    align-items:center; justify-content:center; gap:1rem; z-index:50;
    background:var(--french-navy); text-align:center; padding:2rem;
}
.spinner{ width:48px;height:48px;border:4px solid rgba(212,175,55,.2);border-top-color:var(--accent-gold);border-radius:50%;animation:spin 1s linear infinite }
@keyframes spin{to{transform:rotate(360deg)}}
.error-screen h2{ font-family:var(--font-title); color:var(--accent-gold); }
.error-screen a{ color:var(--accent-gold); }
.hidden{ display:none !important; }

@media (max-width:600px){
    .book-title{ font-size:1.2rem; }
    .controls{ gap:.7rem; padding:.5rem .8rem; }
    .btn-text{ display:none; }
}