/* ============================================================
   Badr Hashemi — interactive book reader
   ============================================================ */

body.reader-body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Ornate reading backdrop */
.reader-backdrop {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-size: cover;
  background-position: center;
}
.reader-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--bg) 62%, transparent);
  backdrop-filter: blur(2px);
}
html[data-theme="dark"] .reader-backdrop { background-image: url("../assets/img/ReadingBackground.jpg"); }
html[data-theme="light"] .reader-backdrop { background-image: url("../assets/img/LightReaderBackground.jpg"); }

/* ---------- Top bar ---------- */
.reader-bar {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.6rem clamp(0.8rem, 3vw, 1.6rem);
  border-bottom: 1px solid var(--border-soft);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(12px);
  z-index: 10;
}
.reader-bar .icon-btn,
.reader-controls .icon-btn {
  width: 44px; height: 44px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink-soft);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
  cursor: pointer;
}
.reader-bar .icon-btn:hover,
.reader-controls .icon-btn:hover { color: var(--gold-bright); border-color: var(--gold); }
.reader-title {
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2.5vw, 1.3rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-right: auto;
}
.reader-title small {
  display: block;
  font-family: var(--font-body);
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 500;
}
.reader-bar .theme-toggle { border-radius: 50%; }

/* ---------- Stage ---------- */
.reader-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(0.6rem, 2vh, 1.6rem);
  min-height: 0;
  position: relative;
}
.flipbook-wrap {
  position: relative;
  max-width: 100%;
  max-height: 100%;
}
.flipbook { width: 100%; height: 100%; }

/* Pages */
.page {
  background: #f8f4e8;
  overflow: hidden;
  border: 1px solid rgba(120, 100, 60, 0.25);
}
.page canvas { width: 100%; height: 100%; display: block; }
.page .page-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  color: #8a7c52;
  background:
    radial-gradient(circle at 50% 40%, rgba(201, 162, 75, 0.10), transparent 60%),
    #f8f4e8;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.page .page-loading .ring {
  width: 30px; height: 30px;
  border-radius: 50%;
  border: 2px solid rgba(160, 130, 60, 0.25);
  border-top-color: #a8802f;
  animation: spin 1.1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* subtle inner gutter shading for realism */
.page::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(0,0,0,0.10), transparent 7%, transparent 93%, rgba(0,0,0,0.06));
}
.page.--left::after { background: linear-gradient(270deg, rgba(0,0,0,0.12), transparent 9%); }
.page.--right::after { background: linear-gradient(90deg, rgba(0,0,0,0.12), transparent 9%); }

/* stPageFlip shadow containers get extra depth */
.stf__parent { filter: drop-shadow(0 30px 45px rgba(0, 0, 0, 0.45)); }
html[data-theme="light"] .stf__parent { filter: drop-shadow(0 24px 40px rgba(90, 70, 30, 0.3)); }

/* ---------- Classic single-page mode ---------- */
.classic-view {
  display: none;
  position: absolute;
  inset: 0;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  text-align: center;
  padding: clamp(0.6rem, 2vh, 1.4rem);
}
body.mode-classic .classic-view { display: block; }
body.mode-classic .flipbook-wrap { display: none; }
.classic-page {
  display: inline-block;
  position: relative;
  min-width: 120px;
  min-height: 160px;
}
.classic-page canvas {
  display: block;
  background: #f8f4e8;
  border: 1px solid rgba(120, 100, 60, 0.25);
  border-radius: 4px;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.45);
  margin-inline: auto;
}
html[data-theme="light"] .classic-page canvas { box-shadow: 0 14px 34px rgba(90, 70, 30, 0.3); }
.classic-page.loading::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 34px; height: 34px;
  margin: -17px 0 0 -17px;
  border-radius: 50%;
  border: 2px solid rgba(160, 130, 60, 0.3);
  border-top-color: var(--gold);
  animation: spin 1.1s linear infinite;
}
.classic-view.zoomed { cursor: grab; }

/* Mode toggle shows the icon of the mode you would switch TO */
#btn-mode .icon-classic { display: block; }
#btn-mode .icon-3d { display: none; }
body.mode-classic #btn-mode .icon-classic { display: none; }
body.mode-classic #btn-mode .icon-3d { display: block; }

/* Zoom cluster */
.zoom-controls { display: inline-flex; align-items: center; gap: 0.35rem; margin-right: 0.4rem; }
.zoom-controls[hidden] { display: none; }
.zoom-label {
  min-width: 46px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

/* ---------- Book loading overlay ---------- */
.reader-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.1rem;
  z-index: 5;
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  backdrop-filter: blur(3px);
  transition: opacity 0.5s var(--ease);
}
.reader-loading.hidden { opacity: 0; pointer-events: none; }
.reader-loading img {
  width: min(190px, 40vw);
  border-radius: 6px;
  box-shadow: var(--shadow);
}
.reader-loading .load-label {
  color: var(--ink-soft);
  font-size: 0.82rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.load-bar {
  width: min(220px, 50vw);
  height: 2px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.load-bar::after {
  content: "";
  display: block;
  width: 40%;
  height: 100%;
  background: var(--gold);
  animation: loadSlide 1.4s infinite var(--ease);
}
@keyframes loadSlide {
  0% { transform: translateX(-110%); }
  100% { transform: translateX(280%); }
}

/* ---------- Bottom controls ---------- */
.reader-controls {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem 1.2rem;
  align-items: center;
  padding: 0.7rem clamp(0.8rem, 3vw, 1.6rem) calc(0.7rem + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--border-soft);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(12px);
  z-index: 10;
}
.progress-row { display: flex; align-items: center; gap: 0.9rem; }
.page-slider {
  flex: 1;
  appearance: none;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--gold) var(--progress, 0%), var(--border) var(--progress, 0%));
  cursor: pointer;
}
.page-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--gold);
  cursor: grab;
}
.page-slider::-moz-range-thumb {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--gold);
  cursor: grab;
}
.page-indicator {
  font-size: 0.85rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.page-indicator .pct { color: var(--gold); margin-left: 0.7rem; }
.nav-row { display: flex; align-items: center; gap: 0.5rem; }

/* Resume toast */
.resume-toast {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translate(-50%, 20px);
  display: flex;
  align-items: center;
  gap: 0.9rem;
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  border: 1px solid var(--gold);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 0.7rem 1rem;
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
  z-index: 20;
}
.resume-toast.show { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }
.resume-toast .btn { min-height: 38px; padding: 0.4rem 0.9rem; font-size: 0.85rem; }
.resume-toast .dismiss {
  background: none; border: none; color: var(--ink-muted);
  font-size: 1.1rem; line-height: 1; padding: 0.3rem; cursor: pointer;
}

@media (max-width: 640px) {
  .reader-controls { grid-template-columns: 1fr; }
  .nav-row { justify-content: center; }
  .reader-bar .hide-mobile { display: none; }
}