/* =========================================================================
   NKA «Дидойцы» — постраничная читалка сканов (_scan.css)
   -------------------------------------------------------------------------
   Используется на страницах:
     book-istoriya-dido.html, book-bukvar-didoyskogo-yazyka.html
   Разметка: .scan-reader > .scan-bar + .scan-stage > img.scan-img
   ========================================================================= */

.scan-reader {
  margin: 18px 0 26px;
}

/* --- Панель управления --------------------------------------------------- */
.scan-bar {
  position: sticky;
  top: 74px;
  z-index: 40;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: rgba(247, 242, 230, .97);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(4px);
}

.scan-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 9px;
  padding: 7px 12px;
  font: inherit;
  font-size: 15px;
  line-height: 1.2;
  cursor: pointer;
  transition: background .15s, border-color .15s, transform .1s;
  white-space: nowrap;
}
.scan-btn:hover { background: #fff; border-color: var(--gold); }
.scan-btn:active { transform: translateY(1px); }
.scan-btn:disabled { opacity: .38; cursor: default; }

.scan-btn-primary {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
  font-weight: 600;
}
.scan-btn-primary:hover { background: var(--green-d); border-color: var(--green-d); color: #fff; }

.scan-btn[aria-pressed="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: #1a1a1a;
  font-weight: 600;
}

.scan-sep {
  width: 1px;
  height: 26px;
  background: var(--line);
  margin: 0 2px;
}

.scan-pagebox {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  color: var(--muted);
}

.scan-page {
  width: 68px;
  padding: 7px 8px;
  text-align: center;
  font: inherit;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  color: var(--ink);
}
.scan-page:focus { outline: 2px solid var(--gold); outline-offset: 1px; }

.scan-zoom {
  min-width: 56px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
}

/* --- Сцена --------------------------------------------------------------- */
.scan-stage {
  position: relative;
  margin-top: 14px;
  padding: 14px;
  background: #2b2721;
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: auto;
  max-height: 78vh;
  text-align: center;
}

.scan-stage.is-fit { overflow: hidden; }

.scan-img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
  background: #fff;
  box-shadow: 0 4px 18px rgba(0, 0, 0, .45);
  transition: opacity .12s ease;
}

.scan-img.is-loading { opacity: .35; }

/* --- Полоса прогресса и подпись ------------------------------------------ */
.scan-progress {
  height: 4px;
  margin-top: 10px;
  background: var(--line);
  border-radius: 3px;
  overflow: hidden;
}
.scan-progress > i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--green), var(--gold));
  transition: width .2s ease;
}

.scan-cap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

.scan-cap-hint { opacity: .85; }

/* --- Врезка «Как читать» -------------------------------------------------- */
.scan-note {
  margin-top: 14px;
  padding: 12px 14px;
  border-left: 3px solid var(--gold);
  background: rgba(255, 255, 255, .55);
  border-radius: 0 10px 10px 0;
  font-size: 14px;
  color: var(--muted);
}

/* --- Мобильные экраны ----------------------------------------------------- */
@media (max-width: 760px) {
  .scan-bar { top: 68px; padding: 8px; gap: 6px; }
  .scan-btn { padding: 7px 10px; font-size: 14px; }
  .scan-page { width: 56px; }
  .scan-stage { padding: 8px; max-height: 70vh; }
  .scan-cap { font-size: 13px; }
}