:root {
  --paper: #f3eee4;
  --paper-deep: #e8e0d2;
  --ink: #1c1914;
  --muted: #6d6558;
  --line: #d8cfc0;
  --plank: #e6dcc8;
  --plank-edge: #c9b89a;
  --serif: "Iowan Old Style", "Source Han Serif TC", "Noto Serif TC", "Songti TC",
    "PMingLiU", "Droid Sans Fallback", Georgia, serif;
  --sans: "SF Pro Text", "PingFang TC", "Noto Sans TC", "WenQuanYi Micro Hei",
    "Droid Sans Fallback", "Helvetica Neue", system-ui, sans-serif;
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --lift: 180ms;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

body {
  min-height: 100dvh;
  min-height: 100svh;
}

.paper {
  min-height: 100dvh;
  padding:
    calc(1.1rem + var(--safe-t))
    calc(1.15rem + var(--safe-r))
    calc(2rem + var(--safe-b))
    calc(1.15rem + var(--safe-l));
  background:
    repeating-linear-gradient(
      0deg,
      rgba(28, 25, 20, 0.018) 0 1px,
      transparent 1px 3px
    ),
    repeating-linear-gradient(
      90deg,
      rgba(28, 25, 20, 0.012) 0 1px,
      transparent 1px 4px
    ),
    radial-gradient(80% 50% at 10% -10%, rgba(196, 92, 62, 0.07), transparent 50%),
    radial-gradient(70% 40% at 100% 0%, rgba(61, 107, 106, 0.055), transparent 46%),
    linear-gradient(180deg, #f7f2e8 0%, var(--paper) 28%, var(--paper-deep) 100%);
}

/* Under the open book the hairline stripes are invisible, and repainting
   them every frame is what drops WebKit below 60fps during the flip. */
html.book-open .paper {
  background:
    radial-gradient(80% 50% at 10% -10%, rgba(196, 92, 62, 0.07), transparent 50%),
    radial-gradient(70% 40% at 100% 0%, rgba(61, 107, 106, 0.055), transparent 46%),
    linear-gradient(180deg, #f7f2e8 0%, var(--paper) 28%, var(--paper-deep) 100%);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mast {
  max-width: 72rem;
  margin: 0 auto 1.25rem;
}

.eyebrow,
.lede,
.hint,
.count {
  color: var(--muted);
}

.app-version {
  margin-left: 0.35rem;
  opacity: 0.6;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.mast-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 8vw, 4.6rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 0.95;
}

.lede {
  margin: 0.7rem 0 0;
  max-width: 36rem;
  font-size: 0.95rem;
}

.player-link,
.ghost,
.primary,
.close-book,
.search-clear,
.view-toggle button,
.chip {
  font-family: var(--sans);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  font-size: 0.86rem;
  text-decoration: none;
  cursor: pointer;
}

.player-link:hover,
.ghost:hover,
.view-toggle button[aria-pressed="true"],
.chip[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.load-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.65rem;
  margin-top: 1rem;
}

.hint {
  margin: 0;
  flex: 1 1 12rem;
  font-size: 0.8rem;
}

.toolbar {
  max-width: 72rem;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.view-toggle {
  display: flex;
  gap: 0.3rem;
  padding: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.4);
}

.view-toggle button {
  border: 0;
  background: transparent;
}

.search {
  position: relative;
  flex: 1 1 14rem;
  max-width: 22rem;
}

.search input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
  font: inherit;
  font-size: 0.92rem;
  padding: 0.55rem 2.1rem 0.55rem 0.9rem;
}

.search-clear {
  position: absolute;
  right: 0.25rem;
  top: 50%;
  transform: translateY(-50%);
  padding: 0.1rem 0.5rem;
  border: 0;
}

.chips {
  max-width: 72rem;
  margin: 0.85rem auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.chip-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--accent, var(--ink));
}

.count {
  max-width: 72rem;
  margin: 0.65rem auto 0;
  font-size: 0.8rem;
}

.stage {
  max-width: 72rem;
  margin: 1rem auto 0;
}

.shelf-empty {
  color: var(--muted);
}

.plank-block {
  margin: 0 0 1.75rem;
}

.plank-label {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0 0 0.45rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.plank-label strong {
  font-family: var(--serif);
  color: var(--ink);
  font-weight: 600;
}

.plank {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.45rem;
  min-height: 13.5rem;
  padding: 3.3rem 0.35rem 0;
  border-bottom: 0.78rem solid var(--plank);
  background:
    linear-gradient(180deg, transparent 58%, rgba(28, 25, 20, 0.05) 100%);
  box-shadow:
    inset 0 -0.35rem 0.55rem rgba(255, 248, 232, 0.35),
    0 0.55rem 0 var(--plank-edge),
    0 0.85rem 1.1rem rgba(28, 25, 20, 0.12);
  overflow: visible;
}

.spine {
  position: relative;
  flex: 0 0 auto;
  width: var(--w);
  height: var(--h);
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transform-origin: 50% 100%;
  transition: transform var(--lift) ease;
}

.spine-box {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
}

.spine-cloth {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: 100%;
  width: 100%;
  padding: 0.7rem 0 0.85rem;
  border-radius: 3px 4px 1px 2px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), transparent 22%),
    linear-gradient(90deg, rgba(0, 0, 0, 0.38) 0, transparent 30%),
    linear-gradient(90deg, transparent 70%, rgba(255, 255, 255, 0.24) 100%),
    var(--cloth);
  box-shadow:
    inset 1px 0 0 rgba(255, 255, 255, 0.22),
    inset 0 8px 10px rgba(255, 255, 255, 0.08),
    2px 5px 10px rgba(28, 25, 20, 0.16);
}

.spine-cloth::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.28), transparent);
}

.spine-fore,
.spine-head {
  position: absolute;
  pointer-events: none;
}

.spine-fore {
  top: 2px;
  bottom: 1px;
  right: -5px;
  width: 5px;
  border-radius: 0 2px 1px 0;
  background:
    repeating-linear-gradient(
      180deg,
      #f6efe2 0 1px,
      #e8dcc6 1px 2px
    );
  box-shadow: 1px 2px 0 rgba(28, 25, 20, 0.08);
}

.spine-head {
  top: -3px;
  left: 1px;
  right: -3px;
  height: 4px;
  border-radius: 2px 2px 0 0;
  background: linear-gradient(90deg, #efe4d0, #f8f1e4 40%, #e4d6bc);
}

.spine-title {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  color: #f7f1e6;
  font-family: var(--serif);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  max-height: 100%;
  overflow: hidden;
}

.spine-label {
  position: absolute;
  left: 8%;
  right: 8%;
  top: 18%;
  height: 0.28rem;
  background: rgba(247, 241, 230, 0.78);
  border-radius: 1px;
}

.spine.is-lifted,
.spine:hover,
.spine:focus-visible {
  transform: translateY(-0.7rem);
  z-index: 2;
}

.spine.is-drawn {
  visibility: hidden;
}

/* Morph source for the shared openCoverBook path (same SVG as 封面牆).
   Sized like a cover from the spine height; invisible but measurable. */
.spine .cover-art {
  position: absolute;
  left: 50%;
  bottom: 0;
  z-index: 0;
  width: calc(var(--h) * 160 / 220);
  height: var(--h);
  transform: translateX(-50%);
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
}

.spine .cover-art svg {
  display: block;
  width: 100%;
  height: 100%;
}

.spine-tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 0.55rem);
  transform: translateX(-50%);
  min-width: 8.5rem;
  max-width: 14rem;
  padding: 0.45rem 0.6rem 0.5rem;
  border-radius: 0.55rem;
  background: var(--ink);
  color: var(--paper);
  opacity: 0;
  pointer-events: none;
  text-align: left;
  box-shadow: 0 8px 20px rgba(28, 25, 20, 0.18);
}

.spine-tip strong {
  display: block;
  font-family: var(--serif);
  font-size: 0.86rem;
}

.spine-tip span {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.72rem;
  opacity: 0.78;
}

.spine.is-lifted .spine-tip,
.spine:hover .spine-tip,
.spine:focus-visible .spine-tip {
  opacity: 1;
}

.covers {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: repeat(auto-fill, minmax(8.4rem, 1fr));
}

.cover-card {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.46);
  border-radius: 0.9rem;
  padding: 0.85rem;
  text-align: left;
  color: inherit;
  cursor: pointer;
  font: inherit;
  touch-action: manipulation;
}

.cover-card h3 {
  margin: 0.55rem 0 0.2rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
}

.cover-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.cover-card .cover-art {
  display: block;
  width: 100%;
  height: auto;
}

.cover-card .cover-art svg {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 0.2rem;
  box-shadow: 0 6px 14px rgba(28, 25, 20, 0.14);
}

.cover-card.is-drawn .cover-art svg {
  opacity: 0;
}

.cover-card h3 {
  font-size: 1rem;
}

/* Cover wall → book phase 1: 2D FLIP zoom onto the CLOSED cover (transform + opacity). */
.leaf-front svg,
.cover-ghost {
  display: block;
  width: 100%;
  height: auto;
}

.cover-ghost {
  position: fixed;
  z-index: 30;
  margin: 0;
  transform-origin: 0 0;
  pointer-events: none;
  will-change: transform;
}

/* Book flip phase 2: front board swings open LEFT on the spine hinge.
   rotateY is the only 3D; transform-origin is the spine (left edge of the leaf). */
.draw-root.is-cover .spread {
  width: min(40rem, 100%);
  min-height: auto;
  margin: 0 auto;
  aspect-ratio: 320 / 220;
  grid-template-columns: 1fr 1fr;
  overflow: visible;
  background: none;
  border-radius: 0;
  box-shadow: none;
  perspective: 1200px;
  -webkit-perspective: 1200px;
}

.draw-root.is-cover.is-closed .spread {
  transform: translateX(-25%);
}

.draw-root.is-cover.is-opened .spread {
  transform: translateX(0);
}

.draw-root.is-cover .page {
  box-shadow: 0 18px 40px rgba(28, 25, 20, 0.14);
}

.draw-root.is-cover .page.left {
  border-radius: 0.7rem 0.12rem 0.12rem 0.7rem;
}

/* Inner page: cream paper, a gutter shadow at the spine, and the page block's
   edges on the fore-edge so the closed book reads as a book, not a card. */
.draw-root.is-cover .page.right {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-radius: 0.12rem 0.7rem 0.7rem 0.12rem;
  background:
    linear-gradient(90deg, rgba(28, 25, 20, 0.1), rgba(28, 25, 20, 0.02) 9%, transparent 16%),
    #f8f0e1;
  box-shadow:
    1px 0 0 #e8dcc6,
    2px 1px 0 #f8f0e1,
    3px 1px 0 #e3d6be,
    4px 2px 0 #f6eedd,
    5px 2px 0 #ddcfb5,
    0 18px 40px rgba(28, 25, 20, 0.16);
}

.page-shade {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(28, 25, 20, 0.38), rgba(28, 25, 20, 0.12) 45%, transparent 80%);
  opacity: 0;
  pointer-events: none;
}

.draw-root.is-cover.is-closed .page-shade {
  opacity: 1;
}

.draw-root.is-cover.is-closed .page.left {
  opacity: 0;
}

/* Keep 聽 / 讀 out of sight until the cover has hinged past edge-on. */
.draw-root.is-cover.is-closed .page.right .actions {
  visibility: hidden;
}

.draw-root.is-cover.is-opened .page.right .actions {
  visibility: visible;
}

.cover-leaf {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 50%;
  z-index: 3;
  transform-origin: 0 50%;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
}

.book-layer[data-morph] .spread {
  pointer-events: none;
}

.draw-root.is-cover.is-closed .cover-leaf {
  transform: rotateY(0deg);
}

.draw-root.is-cover.is-opened .cover-leaf {
  transform: rotateY(-180deg);
}

.draw-root.is-cover.is-closed .leaf-back,
.draw-root.is-cover.is-opened .leaf-front {
  opacity: 0;
}

.draw-root.is-flipping .cover-leaf,
.draw-root.is-flipping .spread {
  will-change: transform;
}

.leaf-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.leaf-front {
  display: grid;
  align-items: center;
  border-radius: 0.12rem 0.6rem 0.6rem 0.12rem;
  background: var(--paper, #ebe4d6);
  box-shadow: 0 18px 40px rgba(28, 25, 20, 0.22);
}

.leaf-front::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 5%;
  background: var(--cloth, #5c564c);
  border-radius: 0.12rem 0 0 0.12rem;
}

.leaf-back {
  transform: rotateY(180deg);
  border-radius: 0.6rem 0.12rem 0.12rem 0.6rem;
  background:
    radial-gradient(circle at 1px 1px, rgba(28, 25, 20, 0.05) 1px, transparent 0) 0 0 / 11px 11px,
    #f4ead8;
  box-shadow: 0 18px 40px rgba(28, 25, 20, 0.14);
}

.leaf-back .bookplate {
  padding: 0.8rem;
}

.leaf-shade {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: #1c1914;
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 640px) {
  .draw-root.is-cover .spread {
    /* Closer perspective on phones so the left hinge reads in depth at 390px. */
    perspective: 780px;
    -webkit-perspective: 780px;
  }

  body.shell-shelf .book-layer:has(.is-cover) {
    padding-left: calc(0.4rem + var(--safe-l));
    padding-right: calc(0.4rem + var(--safe-r));
  }

  .draw-root.is-cover .page {
    padding: 0.85rem 0.75rem;
  }

  .draw-root.is-cover .page.right h2 {
    font-size: 1.2rem;
  }

  .draw-root.is-cover .kicker {
    font-size: 0.68rem;
  }

  .draw-root.is-cover .page.right .author,
  .draw-root.is-cover .page.right .progress {
    font-size: 0.8rem;
  }

  .draw-root.is-cover .page.right .progress {
    margin-top: 0.6rem;
  }

  .leaf-back .bookplate-card {
    padding: 0.8rem 0.5rem;
  }
}

.book-layer {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding:
    calc(3.2rem + var(--safe-t))
    calc(0.8rem + var(--safe-r))
    calc(1rem + var(--safe-b))
    calc(0.8rem + var(--safe-l));
  overflow: visible;
  background: transparent;
}

.book-layer:has(.is-opening),
.book-layer:has(.is-open),
.book-layer:has(.is-flipping) {
  background:
    radial-gradient(70% 55% at 50% 40%, rgba(255, 250, 240, 0.35), transparent 64%),
    rgba(243, 238, 228, 0.92);
}

.book-layer.hidden {
  display: none;
}

.close-book {
  position: absolute;
  top: calc(0.7rem + var(--safe-t));
  right: calc(0.7rem + var(--safe-r));
  z-index: 6;
  background: var(--paper);
}

.book-stage {
  width: min(52rem, 100%);
  overflow: visible;
}

.draw-root {
  position: relative;
  min-height: min(28rem, 72vh);
  overflow: visible;
}

.book-3d-scene {
  position: fixed;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  overflow: visible;
  perspective: min(1400px, 240vw);
  perspective-origin: 50% 46%;
  -webkit-perspective: min(1400px, 240vw);
  -webkit-perspective-origin: 50% 46%;
}

.book-3d {
  --thick: 22px;
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  width: min(15rem, 68vw);
  height: min(20.6rem, 58vh);
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transform:
    translate3d(var(--from-x, 0px), var(--from-y, 0px), 0)
    rotateY(var(--from-yaw, 76deg))
    rotateX(8deg)
    scale(0.26);
  z-index: 4;
  pointer-events: none;
}

.draw-root.is-facing .book-3d,
.draw-root.is-opening .book-3d {
  transform:
    translate3d(0, 0, 48px)
    rotateY(0deg)
    rotateX(0deg)
    scale(1);
  transition: transform 420ms cubic-bezier(0.22, 0.68, 0.18, 1);
}

.draw-root.is-open .book-3d {
  transform:
    translate3d(0, 0, 48px)
    rotateY(0deg)
    scale(1);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 160ms linear,
    transform 420ms cubic-bezier(0.22, 0.68, 0.18, 1);
}

.book-3d-cover,
.book-3d-spine,
.book-3d-fore,
.book-3d-top,
.book-3d-bottom,
.book-3d-back {
  position: absolute;
}

.book-3d-cover {
  inset: 0;
  transform-origin: 100% 50%;
  transform: translateZ(calc(var(--thick) / 2)) rotateY(0deg);
  background: var(--paper);
  box-shadow: 0 14px 28px rgba(28, 25, 20, 0.18);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.book-3d-cover svg {
  display: block;
  width: 100%;
  height: 100%;
}

.draw-root.is-opening .book-3d-cover,
.draw-root.is-open .book-3d-cover {
  transform: translateZ(calc(var(--thick) / 2)) rotateY(118deg);
  transition: transform 400ms cubic-bezier(0.28, 0.14, 0.18, 1);
}

.draw-root.is-flipping .book-3d-cover {
  transform: translateZ(calc(var(--thick) / 2)) rotateY(62deg);
  transition: none;
}

.book-3d-spine {
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--thick);
  display: grid;
  place-items: center;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), transparent 24%),
    linear-gradient(90deg, rgba(0, 0, 0, 0.35), transparent 40%, rgba(255, 255, 255, 0.16)),
    var(--cloth, #5c564c);
  transform-origin: left center;
  transform: rotateY(-90deg) translateX(calc(var(--thick) / -2));
}

.book-3d-spine-title {
  writing-mode: vertical-rl;
  color: #f7f1e6;
  font-family: var(--serif);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  max-height: 90%;
  overflow: hidden;
}

.book-3d-fore {
  top: 2%;
  bottom: 2%;
  right: 0;
  width: var(--thick);
  background:
    repeating-linear-gradient(
      180deg,
      #f7f0e2 0 1px,
      #eadfc9 1px 2px
    );
  transform-origin: right center;
  transform: rotateY(90deg) translateX(calc(var(--thick) / 2));
}

.book-3d-top,
.book-3d-bottom {
  left: 0;
  right: 0;
  height: var(--thick);
  background: linear-gradient(90deg, #efe4d0, #f8f1e4 45%, #e5d7bd);
}

.book-3d-top {
  top: 0;
  transform-origin: top;
  transform: rotateX(90deg) translateY(calc(var(--thick) / -2));
}

.book-3d-bottom {
  bottom: 0;
  transform-origin: bottom;
  transform: rotateX(-90deg) translateY(calc(var(--thick) / 2));
}

.book-3d-back {
  inset: 0;
  background: var(--cloth, #5c564c);
  transform: rotateY(180deg) translateZ(calc(var(--thick) / 2));
}

.spread {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: min(28rem, 72vh);
  background:
    linear-gradient(90deg, transparent 49.4%, rgba(28, 25, 20, 0.08) 50%, transparent 50.6%),
    #fffaf2;
  border-radius: 0.2rem 0.7rem 0.7rem 0.2rem;
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(28, 25, 20, 0.16);
  opacity: 0;
  transform: scale(0.96);
}

.draw-root.is-opening .spread,
.draw-root.is-open .spread,
.draw-root.is-flipping .spread {
  opacity: 1;
  transform: none;
  transition:
    opacity 280ms ease,
    transform 400ms cubic-bezier(0.22, 0.68, 0.18, 1);
}

.draw-root.is-open:not(.is-opening) .spread {
  transition: none;
}

.draw-root.is-open:not(.is-opening) .book-3d,
.draw-root.is-open:not(.is-opening) .book-3d-scene {
  display: none;
}

.draw-root.is-frozen .book-3d,
.draw-root.is-frozen .book-3d-cover,
.draw-root.is-frozen .spread {
  transition: none !important;
}

.page {
  padding: 1.3rem 1.2rem 1.4rem;
}

.page.left {
  background:
    radial-gradient(circle at 1px 1px, rgba(28, 25, 20, 0.05) 1px, transparent 0) 0 0 / 11px 11px,
    #f4ead8;
}

.page.right {
  background: #fffaf2;
}

.bookplate {
  height: 100%;
  display: grid;
  place-items: center;
  text-align: center;
}

.bookplate-card {
  width: min(14rem, 100%);
  padding: 1.2rem 1rem 1.1rem;
  background: #fffaf2;
  border: 1px solid rgba(28, 25, 20, 0.12);
}

.seal {
  width: 3.2rem;
  height: 3.2rem;
  margin: 0 auto 0.7rem;
  border: 2px solid var(--accent, var(--ink));
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--accent, var(--ink));
  font-family: var(--serif);
  font-size: 1.15rem;
}

.bookplate-card p {
  margin: 0.2rem 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.bookplate-card strong {
  display: block;
  margin-top: 0.55rem;
  font-family: var(--serif);
  font-size: 1.05rem;
}

.kicker {
  margin: 0 0 0.45rem;
  font-size: 0.75rem;
  color: var(--muted);
}

.page.right h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.15;
  font-weight: 600;
}

.page.right .author {
  margin: 0.45rem 0 0;
  color: var(--muted);
}

.page.right .progress {
  margin: 1.1rem 0 0;
  font-size: 0.88rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.3rem;
}

.primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  padding: 0.55rem 1.15rem;
}

.primary:disabled,
.ghost:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(1rem + var(--safe-b));
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  font-size: 0.84rem;
  z-index: 30;
}

.toast.hidden,
.hidden {
  display: none;
}

@media (max-width: 640px) {
  .spread {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .page.left {
    min-height: 11rem;
  }

  .page {
    padding: 1rem 1rem 1.1rem;
  }

  h1 {
    font-size: 2.5rem;
  }

  .book-3d {
    width: min(13.5rem, 76vw);
    height: min(18.6rem, 52vh);
  }
}

@media (max-width: 430px) {
  .book-3d-scene {
    perspective: min(1100px, 280vw);
    perspective-origin: 50% 42%;
    -webkit-perspective: min(1100px, 280vw);
    -webkit-perspective-origin: 50% 42%;
  }

  .book-3d {
    width: min(12.25rem, 70vw);
    height: min(16.8rem, 46vh);
  }
}

@media (max-width: 400px) {
  .paper {
    padding-left: calc(0.8rem + var(--safe-l));
    padding-right: calc(0.8rem + var(--safe-r));
  }

  h1 {
    font-size: 2.15rem;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .view-toggle {
    width: 100%;
  }

  .view-toggle button {
    flex: 1;
    padding: 0.45rem 0.35rem;
    font-size: 0.8rem;
  }

  .search {
    max-width: none;
  }

  .chip {
    font-size: 0.78rem;
  }

  .plank {
    min-height: 11.4rem;
    padding-top: 2.7rem;
  }

  .page.right h2 {
    font-size: 1.5rem;
  }

  .primary,
  .ghost {
    min-height: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .spine,
  .spine-tip,
  .book-3d,
  .book-3d-cover,
  .spread {
    transition: none !important;
    animation: none !important;
  }

  .draw-root,
  .book-3d-scene,
  .plank,
  .spine,
  .spine-box {
    perspective: none;
    transform-style: flat;
  }

  .book-3d-scene,
  .book-3d,
  .spine-fore,
  .spine-head {
    display: none;
  }

  .draw-root .spread,
  .draw-root.is-facing .spread,
  .draw-root.is-opening .spread,
  .draw-root.is-flipping .spread,
  .draw-root.is-open .spread {
    opacity: 1;
    transform: none;
  }

  .cover-ghost,
  .cover-leaf,
  .draw-root.is-cover .spread,
  .draw-root.is-cover .page.left,
  .leaf-front,
  .leaf-back,
  .page-shade,
  .leaf-shade {
    transition: none !important;
    animation: none !important;
  }
}

/* Reduced motion (and html.no-book-3d): instant 2D spread. iPhone keeps 3D. */
html.no-book-3d .draw-root,
html.no-book-3d .book-3d-scene {
  perspective: none;
  transform-style: flat;
}

html.no-book-3d .book-3d-scene,
html.no-book-3d .book-3d {
  display: none !important;
}

html.no-book-3d .draw-root .spread,
html.no-book-3d .draw-root.is-drawing .spread,
html.no-book-3d .draw-root.is-facing .spread,
html.no-book-3d .draw-root.is-opening .spread,
html.no-book-3d .draw-root.is-flipping .spread,
html.no-book-3d .draw-root.is-open .spread {
  opacity: 1;
  transform: none;
}

/* Homepage is the rice-paper shelf; player chrome keeps the dark tokens. */
body.shell-shelf {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

body.shell-shelf #app.paper {
  max-width: none;
  margin: 0;
}

body.shell-shelf #app.is-reading {
  display: none;
}

body.shell-shelf .mast-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.45rem;
}

body.shell-shelf .onboarding {
  margin-top: 0.85rem;
}

body.shell-shelf .onboarding .load-row {
  margin-top: 0;
}

body.shell-shelf .onboarding .primary.large {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  font-weight: 700;
}

body.shell-shelf .text-link {
  color: var(--muted);
}

body.shell-shelf .text-link:hover,
body.shell-shelf .text-link:focus-visible {
  color: var(--ink);
}

body.shell-shelf .shelf-banners {
  max-width: 72rem;
  margin: 0.75rem auto 0;
  display: grid;
  gap: 0.55rem;
}

body.shell-shelf .continue-card,
body.shell-shelf .save-banner {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
}

body.shell-shelf .continue-card .continue-label {
  color: #c45c3e;
}

body.shell-shelf .continue-card .progress,
body.shell-shelf .save-banner p {
  color: var(--muted);
}

body.shell-shelf .book-screen,
body.shell-shelf .player-bar,
body.shell-shelf .sheet,
body.shell-shelf .toast {
  --bg: #1a1712;
  --bg-deep: #100e0b;
  --card: #29241e;
  --ink: #f5f0e1;
  --muted: #ada38f;
  --amber: #e8ad47;
  --amber-dim: #b8842a;
  --line: rgba(245, 240, 225, 0.08);
  --radius: 14px;
  color: var(--ink);
}

body.shell-shelf .book-screen {
  min-height: 100dvh;
  max-width: 720px;
  margin: 0 auto;
  padding:
    calc(0.85rem + var(--safe-t))
    calc(1rem + var(--safe-r))
    calc(var(--player-h, 8.25rem) + var(--safe-b) + 1rem)
    calc(1rem + var(--safe-l));
  background:
    radial-gradient(120% 80% at 10% -10%, #3a2c18 0%, transparent 55%),
    radial-gradient(90% 60% at 100% 0%, #2a2218 0%, transparent 50%),
    var(--bg-deep);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua",
    Georgia, serif;
}

body.shell-shelf .sheet button.primary,
body.shell-shelf .book-screen button.primary {
  background: linear-gradient(180deg, #f0c36a, var(--amber-dim));
  color: #1a1208;
  font-weight: 700;
  border-color: rgba(255, 220, 150, 0.35);
}

body.shell-shelf .player-bar {
  z-index: 22;
}

body.shell-shelf .book-layer {
  z-index: 28;
}

body.shell-shelf .sheet {
  z-index: 40;
}

body.shell-shelf .library-status {
  color: var(--ink);
}

@media (max-width: 400px) {
  body.shell-shelf .mast-row {
    flex-wrap: wrap;
  }

  body.shell-shelf .mast-links {
    width: 100%;
    justify-content: flex-start;
  }
}