/* Pustaka AB — pembaca flipbook */

:root {
  --r-bg: #eceae3;
  --r-bg-2: #dedbd1;
  --r-bar: rgba(255, 255, 255, 0.86);
  --r-text: #1d2521;
  --r-muted: #5f6a64;
  --r-border: rgba(0, 0, 0, 0.08);
  --r-hover: rgba(0, 0, 0, 0.06);
  --r-accent: #0f5132;
  --r-accent-text: #ffffff;
  --r-gold: #b8892b;
  --r-paper: #ffffff;
  --r-ph: #f3f1ea;
  --r-ph-text: #c9c3b3;
  --r-shadow: 0 24px 60px rgba(20, 30, 25, 0.22);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --r-bg: #101614;
    --r-bg-2: #0a0f0d;
    --r-bar: rgba(22, 30, 27, 0.86);
    --r-text: #e9ede9;
    --r-muted: #9aa6a0;
    --r-border: rgba(255, 255, 255, 0.08);
    --r-hover: rgba(255, 255, 255, 0.08);
    --r-accent: #3fb27f;
    --r-accent-text: #07140e;
    --r-gold: #d9b25c;
    --r-paper: #fdfdfb;
    --r-ph: #1b2421;
    --r-ph-text: #3a4842;
    --r-shadow: 0 30px 70px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --r-bg: #101614;
  --r-bg-2: #0a0f0d;
  --r-bar: rgba(22, 30, 27, 0.86);
  --r-text: #e9ede9;
  --r-muted: #9aa6a0;
  --r-border: rgba(255, 255, 255, 0.08);
  --r-hover: rgba(255, 255, 255, 0.08);
  --r-accent: #3fb27f;
  --r-accent-text: #07140e;
  --r-gold: #d9b25c;
  --r-paper: #fdfdfb;
  --r-ph: #1b2421;
  --r-ph-text: #3a4842;
  --r-shadow: 0 30px 70px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overscroll-behavior: none; }
body {
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--r-text);
  background: radial-gradient(ellipse at center, var(--r-bg) 0%, var(--r-bg-2) 100%);
  background-color: var(--r-bg);
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  height: 100dvh;
}
button, input { font: inherit; color: inherit; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
[hidden] { display: none !important; }

/* --- bilah atas --- */
.r-top {
  position: fixed; inset: 0 0 auto 0; z-index: 30;
  display: flex; align-items: center; gap: 10px;
  padding: calc(8px + var(--safe-top)) 12px 8px;
  min-height: 56px;
  background: var(--r-bar);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--r-border);
  transition: transform .3s ease, opacity .3s ease;
}
.r-heading { min-width: 0; flex: 1; }
.r-heading h1 {
  margin: 0; font-family: Lora, Georgia, serif; font-size: 1rem; font-weight: 600;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.r-heading p { margin: 1px 0 0; font-size: .78rem; color: var(--r-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.r-top-actions { display: flex; gap: 2px; }

.r-btn {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; border-radius: 10px;
  border: 0; background: transparent; cursor: pointer; color: var(--r-text);
  text-decoration: none; transition: background .15s, color .15s, opacity .15s;
}
.r-btn:hover:not(:disabled) { background: var(--r-hover); }
.r-btn:focus-visible, .r-zoom-level:focus-visible, .r-side:focus-visible { outline: 2px solid var(--r-accent); outline-offset: 2px; }
.r-btn:disabled { opacity: .3; cursor: default; }
.r-btn[aria-expanded="true"] { color: var(--r-accent); background: var(--r-hover); }
.i-compress { display: none; }
.is-fullscreen .i-compress { display: block; }
.is-fullscreen .i-expand { display: none; }

/* --- panggung buku --- */
.r-stage {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  padding-top: calc(56px + var(--safe-top));
  padding-bottom: calc(76px + var(--safe-bottom));
  overflow: hidden;
  touch-action: none;
}
.r-zoom {
  transform-origin: center center;
  will-change: transform;
  transition: transform .15s ease-out;
}
.is-zoomed .r-zoom { transition: none; }
/* Bayangan per halaman, agar sisi kosong di samping sampul tidak tampak seperti halaman. */
.r-book .page { box-shadow: var(--r-shadow); }
.page {
  background: var(--r-paper);
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.page canvas { display: block; width: 100%; height: 100%; pointer-events: none; user-select: none; }
.page-ph {
  position: absolute; inset: 0; display: grid; place-items: center;
  background: var(--r-ph);
  background-image: linear-gradient(100deg, transparent 30%, rgba(255,255,255,.06) 50%, transparent 70%);
  background-size: 200% 100%;
  animation: shimmer 1.6s linear infinite;
}
.page-ph span { font-family: Lora, Georgia, serif; font-size: 1.6rem; color: var(--r-ph-text); }
.page-blank { background: var(--r-paper); }
.page-blank span { font-size: 3rem; color: #e6e1d3; }
@keyframes shimmer { to { background-position: -200% 0; } }

.r-pan { position: absolute; inset: 0; z-index: 5; cursor: grab; touch-action: none; }
.r-pan.is-dragging { cursor: grabbing; }

.r-side {
  position: absolute; top: 50%; z-index: 6;
  width: 48px; height: 48px; margin-top: -24px; border-radius: 50%;
  display: grid; place-items: center;
  border: 1px solid var(--r-border); background: var(--r-bar); color: var(--r-text);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  cursor: pointer; transition: opacity .25s, transform .2s;
  box-shadow: 0 6px 18px rgba(0,0,0,.12);
}
.r-side:hover:not(:disabled) { transform: scale(1.06); }
.r-side:disabled { opacity: 0; pointer-events: none; }
.r-side-prev { left: 24px; }
.r-side-next { right: 24px; }

/* --- kontrol bawah --- */
.r-controls {
  position: fixed; left: 50%; bottom: calc(12px + var(--safe-bottom)); z-index: 30;
  transform: translateX(-50%);
  display: flex; align-items: center; gap: 2px;
  padding: 6px 8px; border-radius: 16px;
  background: var(--r-bar);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--r-border);
  box-shadow: 0 10px 30px rgba(0,0,0,.18);
  transition: transform .3s ease, opacity .3s ease;
  max-width: calc(100vw - 16px);
}
.r-sep { width: 1px; height: 24px; background: var(--r-border); margin: 0 6px; }
.r-page { display: flex; align-items: center; gap: 6px; padding: 0 6px; white-space: nowrap; font-size: .9rem; color: var(--r-muted); font-variant-numeric: tabular-nums; }
.r-page input {
  width: 3.4em; padding: 6px 4px; text-align: center;
  border: 1px solid var(--r-border); border-radius: 8px; background: transparent; color: var(--r-text);
  -moz-appearance: textfield; appearance: textfield;
}
.r-page input::-webkit-outer-spin-button, .r-page input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.r-page input:focus { outline: 2px solid var(--r-accent); outline-offset: 1px; }
.r-zoom-level {
  min-width: 52px; padding: 6px 4px; border: 0; background: transparent; border-radius: 8px;
  font-size: .82rem; color: var(--r-muted); cursor: pointer; font-variant-numeric: tabular-nums;
}
.r-zoom-level:hover { background: var(--r-hover); }

/* Sembunyikan UI saat tidak ada aktivitas */
.is-ready.is-idle .r-top { transform: translateY(-100%); opacity: 0; }
.is-ready.is-idle .r-controls { transform: translate(-50%, 140%); opacity: 0; }
.is-ready.is-idle .r-side { opacity: 0; }

/* --- panel thumbnail --- */
.r-thumbs {
  position: fixed; z-index: 40; top: calc(56px + var(--safe-top)); right: 0; bottom: 0;
  width: 300px; display: flex; flex-direction: column;
  background: var(--r-bar);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-left: 1px solid var(--r-border);
  animation: slideIn .25s ease;
}
.r-thumbs-head { display: flex; align-items: center; justify-content: space-between; padding: 8px 8px 8px 16px; border-bottom: 1px solid var(--r-border); }
.r-thumbs-grid {
  flex: 1; min-height: 0; overflow-y: auto; padding: 14px;
  display: flex; flex-wrap: wrap; gap: 14px; align-content: flex-start;
  overscroll-behavior: contain;
}
.r-thumb {
  position: relative; display: block; flex: 0 0 calc(50% - 7px); padding: 0; overflow: hidden;
  border: 2px solid transparent; border-radius: 6px; background: var(--r-ph); cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,.12); transition: border-color .15s, transform .15s;
}
.r-thumb:hover { transform: translateY(-2px); }
.r-thumb canvas, .r-thumb-ph { display: block; width: 100%; height: auto; }
.r-thumb.is-active { border-color: var(--r-accent); }
.r-thumb-num {
  position: absolute; left: 50%; bottom: 6px; transform: translateX(-50%);
  padding: 1px 8px; border-radius: 99px; font-size: .72rem; font-weight: 600;
  background: rgba(0,0,0,.6); color: #fff;
}
.r-thumb.is-active .r-thumb-num { background: var(--r-accent); color: var(--r-accent-text); }
@keyframes slideIn { from { transform: translateX(30px); opacity: 0; } }

/* --- pemuat & galat --- */
.r-loader, .r-error {
  position: fixed; inset: 0; z-index: 100;
  display: grid; place-items: center; padding: 24px;
  background: var(--r-bg);
  transition: opacity .45s ease, visibility .45s;
}
.r-loader.is-hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.r-loader-card { display: flex; flex-direction: column; align-items: center; gap: 14px; text-align: center; max-width: 320px; }
.r-loader-card img { width: 120px; aspect-ratio: 2 / 3; object-fit: cover; border-radius: 4px; box-shadow: var(--r-shadow); }
.r-loader-card strong { font-family: Lora, Georgia, serif; font-size: 1.1rem; font-weight: 600; }
.r-loader-card p { margin: 0; color: var(--r-muted); line-height: 1.5; }
.r-loader-text { font-size: .85rem; color: var(--r-muted); }
.r-progress { width: 200px; height: 4px; border-radius: 4px; background: var(--r-border); overflow: hidden; }
.r-progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--r-accent), var(--r-gold)); transition: width .3s ease; }
.r-error-actions { display: flex; gap: 10px; }
.r-pill {
  display: inline-flex; padding: 10px 18px; border-radius: 999px; border: 0; cursor: pointer;
  background: var(--r-accent); color: var(--r-accent-text); font-weight: 600; text-decoration: none;
}
.r-pill-ghost { background: var(--r-hover); color: var(--r-text); }

.r-toast {
  position: fixed; left: 50%; top: calc(72px + var(--safe-top)); z-index: 60;
  transform: translate(-50%, -10px); opacity: 0; pointer-events: none;
  padding: 10px 18px; border-radius: 999px; font-size: .88rem;
  background: var(--r-text); color: var(--r-bg);
  box-shadow: 0 8px 24px rgba(0,0,0,.2); transition: opacity .25s, transform .25s;
}
.r-toast.is-visible { opacity: 1; transform: translate(-50%, 0); }
.r-hint {
  position: fixed; left: 50%; top: 50%; z-index: 50; transform: translate(-50%, -50%);
  padding: 14px 20px; border-radius: 14px; max-width: 80vw; text-align: center;
  background: rgba(0,0,0,.78); color: #fff; font-size: .9rem; pointer-events: none;
  animation: fadeInOut 4s ease forwards;
}
@keyframes fadeInOut { 0%, 100% { opacity: 0; } 12%, 85% { opacity: 1; } }

/* --- responsif --- */
@media (max-width: 767px), (max-height: 499px) {
  .r-side { display: none; }
  .r-stage { padding-bottom: calc(66px + var(--safe-bottom)); }
  .r-controls { gap: 0; padding: 4px; bottom: calc(8px + var(--safe-bottom)); border-radius: 14px; }
  .r-controls .r-btn { width: 38px; height: 38px; }
  .r-sep { margin: 0 2px; }
  #btnFirst, #btnLast { display: none; }
  .r-thumbs { top: auto; left: 0; width: auto; height: 55vh; border-left: 0; border-top: 1px solid var(--r-border); border-radius: 18px 18px 0 0; animation-name: slideUp; }
  .r-thumb { flex-basis: calc(25% - 10.5px); }
  @keyframes slideUp { from { transform: translateY(40px); opacity: 0; } }
}
@media (max-width: 380px) {
  #btnZoomOut, #btnZoomIn, .r-sep { display: none; }
}
.is-fullscreen .r-top { padding-top: 8px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}