/* ============================================================
   LAYAR 4: PEMBACA
   Header pembaca, kanvas PDF, overlay pemuatan, dan bilah navigasi halaman.
   ============================================================ */

#reader-screen { background: var(--bg-canvas); }

.reader-header {
  min-height: calc(60px + var(--safe-top));
  padding: var(--safe-top) 0.75rem 0 0.75rem;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 20;
  gap: 8px;
  flex-shrink: 0;
}

.reader-title { flex: 1; min-width: 0; line-height: 1.25; }
.reader-title .rt-main { font-weight: 700; font-size: 0.85rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.reader-title .rt-sub { font-size: 0.7rem; color: var(--text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.reader-actions { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }

.read-progress { height: 3px; background: transparent; flex-shrink: 0; z-index: 20; }
.read-progress > div { height: 100%; width: 0%; background: var(--primary); transition: width 0.3s ease; }

#pdf-viewer-container {
  flex: 1;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1rem 1rem 7rem 1rem;
  position: relative;
  touch-action: pan-x pan-y;
  overscroll-behavior: contain;
}

#page-wrap {
  position: relative;
  width: max-content;
  margin: 0 auto;
}

canvas#pdf-canvas {
  display: block;
  background: #ffffff;
  box-shadow: var(--shadow-lg);
  border-radius: 4px;
  transform-origin: top center;
  transition: opacity 0.2s ease;
}

canvas#pdf-canvas.night { filter: invert(0.92) hue-rotate(180deg); }
canvas#pdf-canvas.loading { opacity: 0.45; }

/* Overlay pemuatan dokumen */
#reader-overlay {
  position: absolute;
  inset: 0;
  z-index: 15;
  background: var(--bg-canvas);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 2rem;
  text-align: center;
}
#reader-overlay.show { display: flex; }

.spinner {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 4px solid var(--primary-light);
  border-top-color: var(--primary);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.overlay-text { font-weight: 600; font-size: 0.95rem; }
.overlay-sub { color: var(--text-muted); font-size: 0.8rem; max-width: 300px; line-height: 1.5; }
.overlay-bar { width: 200px; height: 6px; background: var(--primary-light); border-radius: 6px; overflow: hidden; }
.overlay-bar > div { height: 100%; width: 0%; background: var(--primary); transition: width 0.2s ease; }

/* Navigasi halaman mengambang */
.reader-nav {
  position: absolute;
  left: 50%;
  bottom: calc(46px + var(--safe-bottom));
  transform: translateX(-50%);
  z-index: 18;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px;
  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
}

.page-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 4px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.page-indicator input {
  width: 54px;
  height: 38px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-main);
  text-align: center;
  font-weight: 800;
  font-size: 16px;
  outline: none;
  padding: 0;
  border-radius: 10px;
  font-variant-numeric: tabular-nums;
  -moz-appearance: textfield;
}
.page-indicator input::-webkit-outer-spin-button,
.page-indicator input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.page-indicator input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.page-indicator .pi-sep { opacity: 0.55; }
.page-indicator .pi-total { min-width: 3ch; text-align: left; }

.reader-nav .sep { width: 1px; height: 22px; background: var(--border-color); margin: 0 2px; }