/* =========================================================================
   viewer.css — chrome do visualizador (toolbar, palco, miniaturas).
   O conteúdo da página em si é estilizado por page.css, compartilhado
   com o builder. Nada aqui pode alterar geometria de block ou ícone.
   ========================================================================= */

/* Reset de body/html: sem isso o browser aplica margin:8px e o fb-viewer
   vaza para fora do viewport, criando scroll e borda branca. */
html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #111418;
}

.fb-viewer {
  display: grid;
  grid-template-rows: 56px 1fr;
  height: 100dvh;
  background: #111418;
  color: #e5e7eb;
  font-family: var(--font-sans);
  overflow: hidden;
}

/* ---- Toolbar ----------------------------------------------------------- */
.fb-toolbar {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0 var(--sp-3);
  background: rgba(20, 24, 30, .96);
  border-bottom: 1px solid rgba(255,255,255,.08);
  z-index: var(--z-sidebar);
}
.fb-toolbar__group { display: flex; align-items: center; gap: var(--sp-1); }
.fb-toolbar__group--center { flex: 1; justify-content: center; }
.fb-toolbar__title {
  font: 600 var(--fs-sm)/1 var(--font-sans);
  color: #f3f4f6;
  max-width: 28ch;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.fb-viewer .control-btn { color: #9ca3af; }
.fb-viewer .control-btn:hover { background: rgba(255,255,255,.08); color: #fff; }
.fb-viewer .control-btn.is-active { background: rgba(37,99,235,.25); color: #93c5fd; }

.fb-pageinfo {
  display: flex; align-items: center; gap: 6px;
  padding: 0 var(--sp-2);
  font: 500 var(--fs-sm)/1 var(--font-mono);
  color: #d1d5db;
}
.fb-pageinfo__input {
  width: 3.5em; height: 30px;
  padding: 0 6px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--r-sm);
  background: rgba(255,255,255,.05);
  color: #fff;
  font: inherit; text-align: center;
}
.fb-pageinfo__input:focus { outline: 2px solid var(--c-brand-600); outline-offset: 1px; }
.fb-zoomlevel { min-width: 4ch; text-align: center; font: 500 var(--fs-xs)/1 var(--font-mono); color: #9ca3af; }

.fb-badge {
  padding: 2px 8px;
  border-radius: var(--r-full);
  background: rgba(217,119,6,.18);
  border: 1px solid rgba(217,119,6,.4);
  color: #fbbf24;
  font: 600 11px/1.6 var(--font-sans);
  text-transform: uppercase; letter-spacing: .04em;
}

/* ---- Palco ------------------------------------------------------------- */
.fb-stage {
  position: relative;
  display: grid;
  place-items: center;
  padding: var(--sp-4);
  overflow: hidden;
  --stage-bg: #111418;
  background:
    radial-gradient(120% 80% at 50% 0%, rgba(255,255,255,.06), transparent 60%),
    var(--stage-bg);
  touch-action: pan-y;
}

/* ---- Cenários -----------------------------------------------------------
   Escolhidos no builder e aplicados por atributo: o CSS fica declarativo e
   um cenário novo é uma regra, não mais um caminho no JavaScript. */
.fb-stage[data-stage="escuro"]    { --stage-bg: #111418; }
.fb-stage[data-stage="grafite"]   { --stage-bg: #2a2f36; }
.fb-stage[data-stage="claro"]     { --stage-bg: #e8edf3; }
.fb-stage[data-stage="azul"]      { --stage-bg: #0b1a33; }
.fb-stage[data-stage="quente"]    { --stage-bg: #1b1008; }
.fb-stage[data-stage="esmeralda"] { --stage-bg: #04201c; }

.fb-stage[data-stage="azul"]      { background: radial-gradient(120% 90% at 50% -10%, #1e3a6b, transparent 65%), #0b1a33; }
.fb-stage[data-stage="quente"]    { background: radial-gradient(120% 90% at 50% -10%, #7c3d10, transparent 65%), #1b1008; }
.fb-stage[data-stage="esmeralda"] { background: radial-gradient(120% 90% at 50% -10%, #0b5f50, transparent 65%), #04201c; }
.fb-stage[data-stage="claro"] {
  background: radial-gradient(120% 80% at 50% 0%, #ffffff, transparent 60%), #e8edf3;
}

/* Ondas: camadas suaves no rodapé do palco. Puramente decorativo, então
   `pointer-events: none` e fora do fluxo — nunca disputa clique com a página. */
.fb-stage[data-stage="ondas"] {
  background: radial-gradient(120% 90% at 50% -10%, #17427c, transparent 60%), #0a1b30;
}
.fb-stage[data-stage="ondas"]::before,
.fb-stage[data-stage="ondas"]::after {
  content: "";
  position: absolute; left: -10%; right: -10%; bottom: -6%;
  height: 46%;
  pointer-events: none;
  background: radial-gradient(60% 100% at 50% 100%, rgba(37,99,235,.34), transparent 70%);
  border-radius: 50% 50% 0 0 / 60% 60% 0 0;
}
.fb-stage[data-stage="ondas"]::after {
  bottom: -14%; height: 54%;
  background: radial-gradient(60% 100% at 50% 100%, rgba(14,165,233,.22), transparent 70%);
}

/* No cenário claro a barra escura destoa; o chrome acompanha. */
body[data-stage="claro"] .fb-toolbar { background: rgba(255,255,255,.94); border-bottom-color: rgba(0,0,0,.08); }
body[data-stage="claro"] .fb-toolbar__title { color: #111827; }
body[data-stage="claro"] .fb-viewer .control-btn { color: #4b5563; }
body[data-stage="claro"] .fb-viewer .control-btn:hover { background: rgba(0,0,0,.06); color: #111827; }
body[data-stage="claro"] .fb-pageinfo { color: #374151; }
body[data-stage="claro"] .fb-pageinfo__input { background: #fff; color: #111827; border-color: rgba(0,0,0,.14); }
body[data-stage="claro"] .fb-nav { color: #111827; }
body[data-stage="claro"] .fb-mobilebar { background: rgba(255,255,255,.97); border-top-color: rgba(0,0,0,.08); }
body[data-stage="claro"] .fb-mobilebar__info { color: #374151; }
body[data-stage="claro"] .fb-loading { background: #e8edf3; }
.fb-stage.is-panning { overflow: auto; place-items: start center; cursor: grab; touch-action: auto; }
.fb-stage.is-panning:active { cursor: grabbing; }

/* `touch-action: none` é requisito do turn.js depois do patch para Pointer
   Events: se o navegador decidir que o gesto é rolagem, ele encerra a sequência
   com `pointercancel` e a dobra congela no meio. O palco continua com `pan-y`,
   então rolar fora do livro segue funcionando. */
#flipbook { margin: 0 auto; touch-action: none; }
.fb-stage.is-panning #flipbook { touch-action: auto; }

/* A página é opaca; esse fundo cobre a fresta sub-pixel na dobra sem
   distorcer a geometria (a alternativa seria inflar a escala). */
#flipbook .turn-page { background: #fff; }
#flipbook .turn-page > .pg { position: absolute; left: 0; top: 0; }

/* Sombra de dobra no canto externo. O peel do turn.js é discreto demais para
   comunicar "dá para virar aqui"; esta pista some no toque, onde o gesto
   natural é arrastar. */
@media (hover: hover) {
  #flipbook .turn-page::after {
    content: "";
    position: absolute; right: 0; bottom: 0;
    width: 84px; height: 84px;
    background: linear-gradient(315deg, rgba(0,0,0,.22), rgba(0,0,0,0) 58%);
    opacity: 0;
    transition: opacity var(--t-base) var(--ease);
    pointer-events: none;
    z-index: var(--z-page-ui);
  }
  #flipbook .turn-page:hover::after { opacity: 1; }
}

/* ---- Zonas de navegação ------------------------------------------------ */
/* Metades clicáveis nas laterais do palco: intenção explícita de virar
   página, sem depender do usuário descobrir o arraste do canto. */
.fb-nav {
  position: absolute; top: 0; bottom: 0;
  width: clamp(56px, 12vw, 130px);
  display: grid; place-items: center;
  border: none; background: transparent;
  color: #fff; cursor: pointer;
  opacity: 0;
  transition: opacity var(--t-base) var(--ease), background var(--t-base) var(--ease);
  z-index: var(--z-page-ui);
}
.fb-nav--prev { left: 0; }
.fb-nav--next { right: 0; }
.fb-stage:hover .fb-nav { opacity: .55; }
.fb-nav:hover { opacity: 1 !important; background: linear-gradient(90deg, rgba(0,0,0,.35), transparent); }
.fb-nav--next:hover { background: linear-gradient(270deg, rgba(0,0,0,.35), transparent); }
.fb-nav:focus-visible { opacity: 1; outline: 2px solid var(--c-brand-500); outline-offset: -4px; }
.fb-nav[disabled] { opacity: 0 !important; pointer-events: none; }
.fb-nav svg { filter: drop-shadow(0 2px 6px rgba(0,0,0,.6)); }

.fb-progress {
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 3px; background: rgba(255,255,255,.08);
}
.fb-progress__bar { height: 100%; width: 0; background: var(--c-brand-500); transition: width var(--t-base) var(--ease); }

/* ---- Miniaturas -------------------------------------------------------- */
.fb-thumbs {
  position: absolute; top: 0; bottom: 0; left: 0;
  width: 260px;
  padding: var(--sp-3);
  overflow-y: auto;
  background: rgba(17,20,24,.98);
  border-right: 1px solid rgba(255,255,255,.08);
  transform: translateX(-100%);
  transition: transform var(--t-base) var(--ease);
  z-index: var(--z-sidebar);
}
.fb-thumbs.is-open { transform: none; }
.fb-thumbs__grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: var(--sp-2); }
.fb-thumb {
  position: relative;
  aspect-ratio: 3 / 4;             /* sobrescrito em JS pela razão real */
  padding: 0;
  border: 2px solid transparent;
  border-radius: var(--r-sm);
  background: #fff;
  cursor: pointer;
  overflow: hidden;
}
/* A miniatura é a página renderizada e reduzida — mesmo módulo do viewer. */
.fb-thumb__page {
  position: absolute; left: 0; top: 0;
  transform-origin: 0 0;
  pointer-events: none;
}
.fb-thumb.is-current { border-color: var(--c-brand-500); }
.fb-thumb__n {
  position: absolute; right: 4px; bottom: 4px;
  padding: 1px 5px; border-radius: var(--r-sm);
  background: rgba(0,0,0,.6); color: #fff;
  font: 500 11px/1.4 var(--font-mono);
}

/* ---- Estados ----------------------------------------------------------- */
.fb-loading {
  position: absolute; inset: 0;
  display: grid; place-items: center; gap: var(--sp-3);
  background: #111418;
  z-index: var(--z-modal);
  transition: opacity var(--t-base) var(--ease);
}
.fb-loading[hidden] { display: none; }

.fb-empty {
  display: grid; place-items: center;
  padding: var(--sp-8);
  color: #9ca3af;
  font-size: var(--fs-sm);
  text-align: center;
}

.fb-noscript {
  max-width: 800px; margin: 0 auto; padding: var(--sp-4);
  background: #fff;
}
.fb-noscript p { color: var(--c-text-2); font-size: var(--fs-sm); }
.fb-noscript img { display: block; width: 100%; height: auto; margin-bottom: var(--sp-3); }

/* ---- Barra inferior do celular ----------------------------------------- */
/* No toque, controle bom é o que fica na altura do polegar. A barra de cima
   vira só identidade; a navegação desce. */
.fb-mobilebar { display: none; }

@media (max-width: 768px) {
  .fb-viewer { grid-template-rows: 52px 1fr; }
  .fb-toolbar__title { max-width: 16ch; }
  .fb-toolbar__group--center { display: none; }
  .fb-stage { padding: var(--sp-2) var(--sp-2) 66px; }
  .fb-nav { display: none; }
  .fb-thumbs { width: min(280px, 84vw); }

  /* No celular sobra pouca barra: zoom por botão e alternância de página
     dupla não têm uso (o gesto é pinça, e o modo já é página única). */
  #btnZoomOut, #btnZoomIn, .fb-zoomlevel, #btnDisplay { display: none; }

  .fb-mobilebar {
    position: fixed; left: 0; right: 0; bottom: 0;
    display: flex; align-items: center; justify-content: center; gap: var(--sp-3);
    height: 58px;
    padding: 0 var(--sp-3) env(safe-area-inset-bottom);
    background: rgba(20,24,30,.97);
    border-top: 1px solid rgba(255,255,255,.08);
    z-index: var(--z-sidebar);
  }
  .fb-mobilebar .control-btn { width: 48px; height: 48px; }
  .fb-mobilebar__info {
    min-width: 6ch; text-align: center;
    font: 600 var(--fs-sm)/1 var(--font-mono); color: #d1d5db;
  }
  .fb-mobilebar__hint {
    position: absolute; top: -30px; left: 50%; transform: translateX(-50%);
    padding: 3px 10px; border-radius: var(--r-full);
    background: rgba(0,0,0,.6); color: #e5e7eb;
    font: 500 11px/1.6 var(--font-sans);
    white-space: nowrap;
    animation: fadeaway 5s forwards;
    pointer-events: none;
  }
}

@keyframes fadeaway {
  0%, 60% { opacity: 1; }
  100% { opacity: 0; visibility: hidden; }
}

@media (max-width: 480px) {
  .fb-toolbar { padding: 0 var(--sp-2); }
  .fb-toolbar__title { max-width: 12ch; font-size: var(--fs-xs); }
}