/* ==========================================================================
   Leitor de PDF — modal e flipbook
   ========================================================================== */

.pdf-reader-open {
  overflow: hidden;
}

.pdf-reader[hidden] {
  display: none !important;
}

.pdf-reader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--zc-space-md);
}

.pdf-reader__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 24, 39, 0.82);
}

.pdf-reader__dialog {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  width: min(100%, 1100px);
  max-height: calc(100vh - 2rem);
  background: var(--zc-white);
  border-radius: var(--zc-radius-lg);
  box-shadow: var(--zc-shadow-lg);
  overflow: hidden;
}

.pdf-reader__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--zc-space-md);
  padding: var(--zc-space-md) var(--zc-space-lg);
  background: var(--zc-purple);
  color: var(--zc-white);
}

.pdf-reader__title {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.3;
}

.pdf-reader__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  background: transparent;
  color: var(--zc-white);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: background var(--zc-transition), border-color var(--zc-transition);
}

.pdf-reader__close:hover,
.pdf-reader__close:focus-visible {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--zc-yellow);
  outline: none;
}

.pdf-reader__body {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  padding: var(--zc-space-lg);
  background: linear-gradient(180deg, #f8fafc 0%, #eef2f7 100%);
  overflow: auto;
}

.pdf-reader__loading {
  margin: 0;
  font-weight: 600;
  color: var(--zc-gray-600);
  text-align: center;
}

.pdf-reader__loading[hidden],
.pdf-reader__book[hidden] {
  display: none !important;
}

.pdf-reader__book {
  width: 100%;
  display: flex;
  justify-content: center;
}

.pdf-reader__page {
  background: #fff;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.06);
}

.pdf-reader__page img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  user-select: none;
  pointer-events: none;
}

.pdf-reader__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--zc-space-sm) var(--zc-space-md);
  padding: var(--zc-space-md) var(--zc-space-lg);
  border-top: 1px solid var(--zc-gray-200);
  background: var(--zc-white);
}

.pdf-reader__nav {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 2.5rem;
  padding: 0 0.9rem;
  border: 1px solid var(--zc-gray-200);
  border-radius: 999px;
  background: var(--zc-white);
  color: var(--zc-black);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: border-color var(--zc-transition), background-color var(--zc-transition);
}

.pdf-reader__nav:hover,
.pdf-reader__nav:focus-visible {
  border-color: var(--zc-purple);
  background: var(--zc-gray-100);
  outline: none;
}

.pdf-reader__page-info {
  min-width: 7rem;
  text-align: center;
  font-weight: 700;
  color: var(--zc-gray-900);
}

.pdf-reader__download {
  margin-left: auto;
}

.library-item__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--zc-space-sm);
}

@media (max-width: 768px) {
  .pdf-reader {
    padding: 0;
  }

  .pdf-reader__dialog {
    width: 100%;
    max-height: 100vh;
    border-radius: 0;
  }

  .pdf-reader__body {
    min-height: 50vh;
    padding: var(--zc-space-md);
  }

  .pdf-reader__toolbar {
    padding-inline: var(--zc-space-md);
  }

  .pdf-reader__download {
    width: 100%;
    margin-left: 0;
    justify-content: center;
  }
}