@charset "UTF-8";

:root {
  --paper: #f4f5f2;
  --paper-2: #ecefeb;
  --paper-glass: rgba(244, 245, 242, 0.88);
  --ink: #0d1014;
  --muted: rgba(13, 16, 20, 0.5);
  --faint: rgba(13, 16, 20, 0.32);
  --hairline: rgba(13, 16, 20, 0.13);
  --hairline-soft: rgba(13, 16, 20, 0.07);
  --cyan: #27d8d2;
  --teal: #10a8a3;
  --blue: #2a78f6;
  --white: #fff;
  --shadow: 0 28px 74px rgba(13, 16, 20, 0.12), 0 5px 18px rgba(13, 16, 20, 0.07);
  --ease: cubic-bezier(.2, .72, .2, 1);
  color-scheme: light;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--paper);
}

body {
  min-width: 320px;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overscroll-behavior: none;
}

body::after {
  content: "";
  position: fixed;
  z-index: 1000;
  inset: 0;
  pointer-events: none;
  opacity: .026;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.94' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.7'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible,
.stage:focus-visible {
  outline: 1px solid rgba(13, 16, 20, .72);
  outline-offset: 5px;
}

::selection {
  background: rgba(39, 216, 210, .28);
}

.svg-sprite {
  position: fixed;
  width: 0;
  height: 0;
  overflow: hidden;
  pointer-events: none;
}

.app {
  position: relative;
  width: 100%;
  height: 100dvh;
  isolation: isolate;
  overflow: hidden;
  background:
    radial-gradient(circle at 73% 31%, rgba(39, 216, 210, .085), transparent 26vw),
    radial-gradient(circle at 82% 43%, rgba(42, 120, 246, .04), transparent 24vw),
    var(--paper);
}

.ambient,
.ambient > * {
  position: absolute;
  pointer-events: none;
}

.ambient {
  z-index: -2;
  inset: 0;
  overflow: hidden;
}

.ambient-cover {
  inset: 0;
}

.ambient-cover::before,
.ambient-cover::after {
  position: absolute;
  color: rgba(13, 16, 20, .16);
  font-size: 8px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
}

.ambient-cover::before {
  content: "CHINA SPATIAL INTELLIGENCE CONFERENCE";
  top: 112px;
  left: 34px;
  writing-mode: vertical-rl;
}

.ambient-cover::after {
  content: "READER / 2026";
  right: 36px;
  bottom: 104px;
}

.ambient-grid {
  inset: 0;
  opacity: .28;
  background-image:
    linear-gradient(to right, var(--hairline-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hairline-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(circle at 62% 48%, #000 0%, rgba(0, 0, 0, .72) 34%, transparent 76%);
  mask-image: radial-gradient(circle at 62% 48%, #000 0%, rgba(0, 0, 0, .72) 34%, transparent 76%);
}

.ambient-glow {
  border-radius: 50%;
  filter: blur(12px);
  opacity: .32;
}

.ambient-glow-a {
  width: 34vw;
  height: 34vw;
  right: 4vw;
  top: 8vh;
  background: radial-gradient(circle, rgba(39, 216, 210, .12), transparent 66%);
  animation: breathe 8s ease-in-out infinite;
}

.ambient-glow-b {
  width: 25vw;
  height: 25vw;
  left: 17vw;
  bottom: -12vw;
  background: radial-gradient(circle, rgba(42, 120, 246, .07), transparent 68%);
}

.ambient-ring {
  width: min(66vw, 850px);
  aspect-ratio: 1;
  left: 50%;
  top: 49%;
  border: 1px solid rgba(13, 16, 20, .09);
  border-radius: 50%;
  transform: translate(-48%, -50%);
  animation: slowSpin 34s linear infinite;
}

.ambient-ring::before,
.ambient-ring::after {
  content: "";
  position: absolute;
  border-radius: 50%;
}

.ambient-ring::before {
  inset: 12%;
  border: 1px dashed rgba(13, 16, 20, .085);
  animation: reverseSpin 23s linear infinite;
}

.ambient-ring::after {
  inset: 32%;
  border: 1px solid rgba(16, 168, 163, .11);
  box-shadow:
    0 -40px 0 -39px rgba(16, 168, 163, .55),
    0 40px 0 -39px rgba(13, 16, 20, .28),
    40px 0 0 -39px rgba(42, 120, 246, .32),
    -40px 0 0 -39px rgba(13, 16, 20, .2);
}

.topbar {
  position: relative;
  z-index: 30;
  height: 80px;
  display: grid;
  grid-template-columns: minmax(270px, 1fr) auto minmax(270px, 1fr);
  align-items: center;
  gap: 24px;
  padding: 0 34px;
  border-bottom: 1px solid var(--hairline-soft);
  background: rgba(244, 245, 242, .82);
  backdrop-filter: blur(18px) saturate(1.1);
  -webkit-backdrop-filter: blur(18px) saturate(1.1);
}

.topbar::after {
  content: "";
  position: absolute;
  right: 34px;
  bottom: -1px;
  width: 84px;
  height: 1px;
  background: var(--teal);
  transform-origin: right;
  transform: scaleX(.28);
  opacity: .52;
}

.brand {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 13px;
}

.brand-mark,
.loading-emblem {
  position: relative;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid rgba(13, 16, 20, .82);
  border-radius: 50%;
  background: rgba(255, 255, 255, .28);
}

.brand-mark {
  width: 40px;
  height: 40px;
}

.brand-mark::before,
.loading-emblem::before {
  content: "";
  position: absolute;
  top: -2px;
  bottom: -2px;
  left: 50%;
  width: 5px;
  background: var(--paper);
  transform: translateX(-50%);
}

.brand-mark::after,
.loading-emblem::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(39, 216, 210, .12);
  transform: translate(-50%, -50%);
}

.brand-mark span,
.loading-emblem span {
  position: relative;
  z-index: 2;
  padding: 2px;
  color: var(--ink);
  font-size: 0;
  font-weight: 800;
}

.brand-copy {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand-copy strong {
  overflow: hidden;
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .035em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-copy span {
  overflow: hidden;
  color: var(--muted);
  font-size: 9px;
  letter-spacing: .13em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.event-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
}

.event-meta .event-kicker {
  color: var(--faint);
  font-size: 8px;
  font-weight: 600;
  letter-spacing: .24em;
}

.event-meta > span:last-child {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(13, 16, 20, .68);
  font-size: 10px;
  letter-spacing: .1em;
}

.event-meta b {
  color: var(--ink);
  font-size: 10px;
  font-weight: 680;
}

.event-meta i {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(39, 216, 210, .1);
}

.top-actions {
  display: flex;
  justify-content: flex-end;
  gap: 5px;
}

.icon-button,
.zoom-tools button,
.mobile-page-button {
  display: grid;
  place-items: center;
  border: 1px solid transparent;
  color: rgba(13, 16, 20, .72);
  background: transparent;
  cursor: pointer;
  transition: color .24s ease, border-color .24s ease, background .24s ease, transform .24s var(--ease);
}

.icon-button {
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: 50%;
}

.icon-button::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid var(--hairline);
  border-radius: inherit;
  transition: inset .25s var(--ease), border-color .25s ease, background .25s ease;
}

.icon-button:hover {
  color: var(--ink);
  transform: translateY(-1px);
}

.icon-button:hover::after {
  inset: 2px;
  border-color: rgba(13, 16, 20, .36);
}

.icon-button.active {
  color: var(--white);
}

.icon-button.active::after {
  inset: 3px;
  border-color: var(--ink);
  background: var(--ink);
}

.icon-button.compact {
  width: 36px;
  height: 36px;
}

.icon-button svg,
.page-nav svg,
.zoom-tools svg,
.mobile-page-button svg,
.toast svg {
  position: relative;
  z-index: 2;
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.65;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.reader {
  position: relative;
  z-index: 3;
  height: calc(100dvh - 80px);
  display: grid;
  grid-template-rows: minmax(0, 1fr) 78px;
}

.mobile-scroll-reader {
  display: none;
}

.stage {
  position: relative;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 14px 84px 6px;
  outline: none;
}

.book-viewport {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.book-transform {
  position: relative;
  display: grid;
  place-items: center;
  transform: translate3d(0, 0, 0) scale(1);
  transform-origin: center;
  will-change: transform;
  transition: transform .22s var(--ease);
  touch-action: none;
}

.book-transform.no-transition,
.book-transform.is-dragging {
  transition: none;
}

.book-transform.is-dragging {
  cursor: grabbing;
}

.book-frame {
  --book-ratio: 1.4134;
  position: relative;
  width: min(76vw, calc((100dvh - 192px) * var(--book-ratio)));
  aspect-ratio: var(--book-ratio);
  overflow: hidden;
  border: 1px solid rgba(13, 16, 20, .2);
  border-radius: 2px;
  background: #fff;
  box-shadow: var(--shadow);
  isolation: isolate;
  user-select: none;
  -webkit-user-select: none;
  transition: width .36s var(--ease), border-radius .36s ease, box-shadow .36s ease;
}

.book-frame::after {
  content: "";
  position: absolute;
  z-index: 8;
  right: -8px;
  bottom: -8px;
  width: 34px;
  height: 34px;
  border-right: 1px solid rgba(13, 16, 20, .16);
  border-bottom: 1px solid rgba(13, 16, 20, .16);
  pointer-events: none;
}

.book-frame.is-single {
  --book-ratio: .7067;
  width: min(43vw, calc((100dvh - 192px) * var(--book-ratio)));
  border-radius: 2px 7px 7px 2px;
  box-shadow: 20px 28px 68px rgba(13, 16, 20, .14), 4px 5px 14px rgba(13, 16, 20, .08);
}

.book-frame.is-back-cover {
  border-radius: 7px 2px 2px 7px;
}

.book-frame picture,
.book-frame img,
.page-placeholder {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.book-frame picture {
  z-index: 2;
}

.book-frame img {
  display: block;
  object-fit: fill;
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s ease;
  -webkit-user-drag: none;
}

.book-frame.is-loaded img {
  opacity: 1;
}

.page-placeholder {
  z-index: 1;
  overflow: hidden;
  background-color: #e7eae7;
  background-position: center;
  background-size: cover;
  filter: saturate(.7);
  transform: scale(1.01);
}

.page-placeholder::after {
  content: "";
  position: absolute;
  inset: -45%;
  background: linear-gradient(105deg, transparent 43%, rgba(255, 255, 255, .74) 50%, transparent 57%);
  transform: translateX(-55%);
  animation: pageLoading 1.5s ease-in-out infinite;
}

.book-frame.is-loaded .page-placeholder::after {
  opacity: 0;
  animation: none;
}

.page-spine {
  position: absolute;
  z-index: 4;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 64px;
  opacity: .72;
  transform: translateX(-50%);
  background: linear-gradient(90deg,
    transparent,
    rgba(13, 16, 20, .035) 28%,
    rgba(13, 16, 20, .17) 48%,
    rgba(255, 255, 255, .65) 51%,
    rgba(13, 16, 20, .075) 58%,
    transparent);
  mix-blend-mode: multiply;
  pointer-events: none;
}

.book-frame.is-single .page-spine {
  display: none;
}

.paper-light {
  position: absolute;
  z-index: 3;
  inset: 0;
  background: linear-gradient(115deg, rgba(255, 255, 255, .14), transparent 19%, transparent 80%, rgba(13, 16, 20, .035));
  pointer-events: none;
}

.page-edge {
  position: absolute;
  z-index: 5;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, .56);
  box-shadow: inset -2px 0 4px rgba(13, 16, 20, .045);
  pointer-events: none;
}

.book-frame.is-single::before {
  content: "";
  position: absolute;
  z-index: 6;
  top: 0;
  bottom: 0;
  left: 0;
  width: 7px;
  background: linear-gradient(90deg, rgba(13, 16, 20, .18), rgba(255, 255, 255, .08), transparent);
  pointer-events: none;
}

.book-frame.is-back-cover::before {
  right: 0;
  left: auto;
  transform: scaleX(-1);
}

.book-frame.turn-next {
  animation: turnNext .4s var(--ease) both;
}

.book-frame.turn-prev {
  animation: turnPrev .4s var(--ease) both;
}

.page-nav {
  position: absolute;
  z-index: 8;
  top: 50%;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  overflow: hidden;
  padding: 0;
  border: 1px solid var(--hairline);
  border-radius: 50%;
  color: rgba(13, 16, 20, .66);
  background: rgba(244, 245, 242, .72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  transform: translateY(-50%);
  transition: color .25s ease, background .25s ease, border-color .25s ease, transform .25s var(--ease);
}

.page-nav span {
  display: none;
}

.page-nav:hover {
  color: var(--white);
  border-color: var(--ink);
  background: var(--ink);
  transform: translateY(-50%) scale(1.05);
}

.page-nav:disabled,
.mobile-page-button:disabled {
  opacity: .24;
  pointer-events: none;
}

.page-nav-prev {
  left: 26px;
}

.page-nav-next {
  right: 26px;
}

.zoom-tools {
  position: absolute;
  z-index: 10;
  right: 28px;
  bottom: 18px;
  display: flex;
  overflow: hidden;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: rgba(244, 245, 242, .78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.zoom-tools button {
  width: 38px;
  height: 38px;
  border: 0;
  border-right: 1px solid var(--hairline-soft);
  border-radius: 0;
}

.zoom-tools button:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, .64);
}

.zoom-tools button:last-child {
  border-right: 0;
}

.zoom-tools .zoom-value {
  width: 58px;
  color: var(--muted);
  font-size: 9px;
  font-variant-numeric: tabular-nums;
}

.gesture-tip {
  position: absolute;
  z-index: 5;
  bottom: 20px;
  left: 30px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--faint);
  font-size: 8px;
  letter-spacing: .11em;
  text-transform: uppercase;
  transition: opacity .4s ease, transform .4s ease;
}

.gesture-tip.is-hidden {
  opacity: 0;
  transform: translateY(6px);
}

.gesture-line {
  position: relative;
  width: 34px;
  height: 1px;
  overflow: hidden;
  background: var(--hairline);
}

.gesture-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--teal);
  animation: hintLine 2.4s ease-in-out infinite;
}

.reader-controls {
  position: relative;
  z-index: 12;
  display: grid;
  grid-template-columns: 48px minmax(280px, 720px) 48px;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 6px 24px 16px;
}

.progress-block {
  position: relative;
  min-width: 0;
  padding: 8px 2px 9px;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline-soft);
  background: transparent;
}

.progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 9px;
}

.progress-meta > span {
  overflow: hidden;
  color: var(--muted);
  font-size: 9px;
  letter-spacing: .1em;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-transform: uppercase;
}

#pageCounter {
  display: flex;
  align-items: baseline;
  gap: 5px;
  padding: 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
}

#pageCounter strong {
  min-width: 24px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 680;
  font-variant-numeric: tabular-nums;
}

#pageCounter span {
  color: var(--faint);
  font-size: 9px;
  font-variant-numeric: tabular-nums;
}

#progressRange {
  width: 100%;
  height: 2px;
  display: block;
  margin: 0;
  border-radius: 0;
  appearance: none;
  -webkit-appearance: none;
  background: linear-gradient(90deg, var(--ink) var(--progress, 0%), rgba(13, 16, 20, .12) var(--progress, 0%));
  cursor: pointer;
}

#progressRange::-webkit-slider-thumb {
  width: 11px;
  height: 11px;
  border: 2px solid var(--paper);
  border-radius: 50%;
  appearance: none;
  -webkit-appearance: none;
  background: var(--teal);
  box-shadow: 0 0 0 1px rgba(13, 16, 20, .55);
}

#progressRange::-moz-range-thumb {
  width: 7px;
  height: 7px;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 1px rgba(13, 16, 20, .55);
}

.mobile-page-button {
  width: 44px;
  height: 44px;
  border-color: var(--hairline);
  border-radius: 50%;
  background: rgba(244, 245, 242, .64);
}

.mobile-page-button:hover {
  color: var(--white);
  border-color: var(--ink);
  background: var(--ink);
}

.thumb-panel {
  position: fixed;
  z-index: 50;
  top: 96px;
  bottom: 22px;
  left: 22px;
  width: 316px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
  border: 1px solid rgba(13, 16, 20, .16);
  border-radius: 3px;
  background: rgba(244, 245, 242, .95);
  box-shadow: 0 28px 70px rgba(13, 16, 20, .13);
  backdrop-filter: blur(22px) saturate(1.08);
  -webkit-backdrop-filter: blur(22px) saturate(1.08);
  opacity: 0;
  transform: translateX(calc(-100% - 32px));
  transition: transform .34s var(--ease), opacity .24s ease;
  pointer-events: none;
}

.app.panel-open .thumb-panel {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.thumb-panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 17px 16px 20px;
  border-bottom: 1px solid var(--hairline-soft);
}

.thumb-panel-head span,
.page-jump-card > span {
  color: var(--teal);
  font-size: 8px;
  font-weight: 650;
  letter-spacing: .2em;
}

.thumb-panel-head h2,
.page-jump-card h2 {
  margin: 5px 0 0;
  color: var(--ink);
  font-size: 18px;
  font-weight: 520;
  letter-spacing: -.02em;
}

.thumb-list {
  overflow: auto;
  padding: 12px 10px 18px;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(13, 16, 20, .22) transparent;
}

.thumb-item {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: 106px minmax(0, 1fr);
  align-items: center;
  gap: 13px;
  margin: 0 0 5px;
  padding: 8px;
  border: 0;
  border-bottom: 1px solid var(--hairline-soft);
  color: inherit;
  text-align: left;
  background: transparent;
  cursor: pointer;
  transition: background .2s ease, transform .2s var(--ease);
}

.thumb-item::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 0;
  width: 1px;
  background: var(--teal);
  transform: scaleY(0);
  transition: transform .25s var(--ease);
}

.thumb-item:hover {
  background: rgba(255, 255, 255, .42);
  transform: translateX(2px);
}

.thumb-item.active::before {
  transform: scaleY(1);
}

.thumb-item.active {
  background: rgba(255, 255, 255, .62);
}

.thumb-image {
  position: relative;
  width: 106px;
  aspect-ratio: 1.4134;
  overflow: hidden;
  border: 1px solid rgba(13, 16, 20, .12);
  border-radius: 1px;
  background: #fff;
  box-shadow: 0 6px 14px rgba(13, 16, 20, .08);
}

.thumb-item:first-child .thumb-image,
.thumb-item:last-child .thumb-image {
  width: 53px;
  justify-self: center;
  aspect-ratio: .7067;
  border-radius: 1px 3px 3px 1px;
}

.thumb-image img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: fill;
}

.thumb-copy {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.thumb-copy strong {
  overflow: hidden;
  color: var(--ink);
  font-size: 11px;
  font-weight: 560;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.thumb-copy span {
  color: var(--faint);
  font-size: 8px;
  letter-spacing: .12em;
}

.thumb-item.active .thumb-copy span {
  color: var(--teal);
}

.thumb-panel-foot {
  display: flex;
  justify-content: space-between;
  padding: 13px 20px 15px;
  border-top: 1px solid var(--hairline-soft);
  color: var(--faint);
  font-size: 8px;
  letter-spacing: .12em;
}

.panel-backdrop {
  position: fixed;
  z-index: 45;
  inset: 0;
  display: none;
  border: 0;
  background: rgba(13, 16, 20, .18);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}

.page-jump {
  position: fixed;
  z-index: 90;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(244, 245, 242, .72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s ease;
}

.page-jump.open {
  opacity: 1;
  pointer-events: auto;
}

.page-jump-card {
  width: min(350px, 100%);
  padding: 28px;
  border: 1px solid var(--hairline);
  border-radius: 3px;
  background: var(--paper);
  box-shadow: 0 28px 80px rgba(13, 16, 20, .14);
  transform: translateY(10px);
  transition: transform .25s var(--ease);
}

.page-jump.open .page-jump-card {
  transform: translateY(0);
}

.page-jump-card form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  margin-top: 22px;
}

.page-jump-card label {
  display: flex;
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--hairline);
  border-radius: 2px;
  background: rgba(255, 255, 255, .4);
}

.page-jump-card input {
  min-width: 0;
  width: 100%;
  padding: 12px 4px 12px 14px;
  border: 0;
  outline: 0;
  color: var(--ink);
  font-size: 18px;
  font-weight: 650;
  background: transparent;
}

.page-jump-card label b {
  padding-right: 13px;
  color: var(--faint);
  font-size: 10px;
  font-weight: 500;
  white-space: nowrap;
}

.page-jump-card form button {
  padding: 0 18px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  color: var(--white);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: .1em;
  background: var(--ink);
  cursor: pointer;
}

.page-jump-cancel {
  width: 100%;
  margin-top: 9px;
  padding: 9px;
  border: 0;
  color: var(--muted);
  font-size: 10px;
  background: transparent;
  cursor: pointer;
}

.toast {
  position: fixed;
  z-index: 110;
  top: 94px;
  left: 50%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 15px;
  border-radius: 999px;
  color: var(--white);
  font-size: 10px;
  letter-spacing: .04em;
  background: rgba(13, 16, 20, .92);
  box-shadow: 0 12px 34px rgba(13, 16, 20, .16);
  opacity: 0;
  transform: translate(-50%, -10px);
  transition: .24s var(--ease);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.toast svg {
  width: 14px;
  height: 14px;
  color: var(--cyan);
}

.loading-screen {
  position: fixed;
  z-index: 999;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  background:
    radial-gradient(circle at 64% 44%, rgba(39, 216, 210, .09), transparent 25vw),
    var(--paper);
  transition: opacity .5s ease, visibility .5s ease;
}

.loading-screen::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .26;
  background-image:
    linear-gradient(to right, var(--hairline-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hairline-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(circle at 50% 50%, #000, transparent 68%);
  mask-image: radial-gradient(circle at 50% 50%, #000, transparent 68%);
}

.loading-screen.is-hidden {
  visibility: hidden;
  opacity: 0;
}

.loading-emblem {
  width: 74px;
  height: 74px;
  animation: breathe 4s ease-in-out infinite;
}

.loading-screen p {
  position: relative;
  margin: 0 0 18px;
  font-size: 18px;
  font-weight: 650;
  letter-spacing: .1em;
}

.loading-screen small {
  position: relative;
  margin-top: 12px;
  color: var(--faint);
  font-size: 8px;
  letter-spacing: .18em;
}

.loading-track {
  position: relative;
  width: 164px;
  height: 1px;
  overflow: hidden;
  background: var(--hairline);
}

.loading-track span {
  display: block;
  width: 42%;
  height: 100%;
  background: var(--teal);
  animation: loadingTrack 1.3s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { transform: scale(.96); opacity: .7; }
  50% { transform: scale(1.04); opacity: 1; }
}

@keyframes slowSpin {
  to { transform: translate(-48%, -50%) rotate(360deg); }
}

@keyframes reverseSpin {
  to { transform: rotate(-360deg); }
}

@keyframes loadingTrack {
  from { transform: translateX(-115%); }
  to { transform: translateX(340%); }
}

@keyframes pageLoading {
  from { transform: translateX(-55%); }
  to { transform: translateX(55%); }
}

@keyframes hintLine {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}

@keyframes turnNext {
  0% { opacity: .55; transform: perspective(1500px) translateX(22px) rotateY(-2deg) scale(.987); }
  100% { opacity: 1; transform: perspective(1500px) translateX(0) rotateY(0) scale(1); }
}

@keyframes turnPrev {
  0% { opacity: .55; transform: perspective(1500px) translateX(-22px) rotateY(2deg) scale(.987); }
  100% { opacity: 1; transform: perspective(1500px) translateX(0) rotateY(0) scale(1); }
}

@media (max-width: 1100px) {
  .topbar {
    grid-template-columns: minmax(240px, 1fr) auto;
  }

  .event-meta {
    display: none;
  }

  .book-frame {
    width: min(82vw, calc((100dvh - 192px) * var(--book-ratio)));
  }

  .book-frame.is-single {
    width: min(52vw, calc((100dvh - 192px) * var(--book-ratio)));
  }
}

@media (max-width: 900px), (hover: none) and (pointer: coarse) {
  .loading-screen {
    display: none;
  }

  .app {
    background:
      radial-gradient(circle at 80% 18%, rgba(39, 216, 210, .08), transparent 44vw),
      var(--paper);
  }

  .ambient-cover::before,
  .ambient-cover::after {
    display: none;
  }

  .ambient-grid {
    background-size: 48px 48px;
    opacity: .24;
  }

  .ambient-ring {
    width: 150vw;
    left: 58%;
    top: 48%;
    opacity: .66;
  }

  .topbar {
    height: 58px;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    padding: 0 max(12px, env(safe-area-inset-right)) 0 max(14px, env(safe-area-inset-left));
  }

  .topbar::after {
    right: 12px;
  }

  .brand {
    gap: 9px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand-copy strong {
    font-size: 13px;
  }

  .brand-copy span {
    max-width: 166px;
    font-size: 8px;
    letter-spacing: .08em;
  }

  .top-actions {
    gap: 2px;
  }

  .icon-button {
    width: 38px;
    height: 38px;
  }

  #modeToggle,
  #fullscreenButton {
    display: none;
  }

  .reader {
    height: calc(100dvh - 58px);
    display: block;
  }

  .mobile-scroll-reader {
    position: absolute;
    inset: 0 0 70px;
    display: block;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 11px 0 34px;
    scroll-behavior: smooth;
    overscroll-behavior-y: contain;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .mobile-scroll-reader::-webkit-scrollbar {
    display: none;
  }

  .mobile-reader-hint {
    width: calc(100% - 28px);
    max-width: 620px;
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 2px auto 12px;
    color: var(--faint);
    font-size: 8px;
    letter-spacing: .11em;
    transition: opacity .35s ease, max-height .35s ease, margin .35s ease;
  }

  .mobile-reader-hint span {
    width: 28px;
    height: 1px;
    flex: 0 0 auto;
    background: var(--teal);
  }

  .mobile-reader-hint p {
    margin: 0;
  }

  .mobile-reader-hint.is-hidden {
    max-height: 0;
    margin-top: 0;
    margin-bottom: 0;
    opacity: 0;
    overflow: hidden;
  }

  .mobile-page-list {
    width: 100%;
  }

  .mobile-page-card {
    width: calc(100% - 22px);
    max-width: 620px;
    margin: 0 auto 18px;
  }

  .mobile-page-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 24px;
    padding: 0 2px 7px;
    color: var(--faint);
    font-size: 8px;
    letter-spacing: .1em;
    text-transform: uppercase;
  }

  .mobile-page-meta b {
    color: rgba(13, 16, 20, .54);
    font-size: 8px;
    font-weight: 550;
    font-variant-numeric: tabular-nums;
  }

  .mobile-page-paper {
    position: relative;
    width: 100%;
    aspect-ratio: .7067;
    overflow: hidden;
    border: 1px solid rgba(13, 16, 20, .17);
    border-radius: 2px;
    background: #e9ece8;
    box-shadow: 0 15px 38px rgba(13, 16, 20, .11), 0 3px 9px rgba(13, 16, 20, .06);
  }

  .mobile-page-card.is-cover .mobile-page-paper {
    border-radius: 2px 7px 7px 2px;
  }

  .mobile-page-card.is-back-cover .mobile-page-paper {
    border-radius: 7px 2px 2px 7px;
  }

  .mobile-page-paper::after {
    content: "";
    position: absolute;
    z-index: 0;
    inset: -35%;
    background: linear-gradient(105deg, transparent 43%, rgba(255, 255, 255, .8) 50%, transparent 57%);
    animation: pageLoading 1.5s ease-in-out infinite;
  }

  .mobile-page-card.is-loaded .mobile-page-paper::after,
  .mobile-page-card.is-error .mobile-page-paper::after {
    display: none;
  }

  .mobile-page-paper picture,
  .mobile-page-paper img {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
    display: block;
  }

  .mobile-page-paper img {
    object-fit: fill;
    opacity: 0;
    transition: opacity .22s ease;
    -webkit-user-drag: none;
  }

  .mobile-page-card.is-loaded img {
    opacity: 1;
  }

  .stage {
    display: none;
  }

  .book-frame,
  .book-frame.is-single {
    width: min(calc(100vw - 28px), calc((100dvh - 172px) * .7067));
    border-radius: 2px 7px 7px 2px;
  }

  .page-nav {
    display: none;
  }

  .zoom-tools {
    top: 10px;
    right: 10px;
    bottom: auto;
    opacity: .84;
  }

  .zoom-tools button {
    width: 36px;
    height: 36px;
  }

  .zoom-tools .zoom-value {
    width: 48px;
  }

  .gesture-tip {
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
  }

  .gesture-tip.is-hidden {
    transform: translate(-50%, 5px);
  }

  .reader-controls {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 70px;
    grid-template-columns: 44px minmax(0, 1fr) 44px;
    gap: 9px;
    padding: 7px max(10px, env(safe-area-inset-right)) max(8px, env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));
    border-top: 1px solid var(--hairline-soft);
    background: rgba(244, 245, 242, .9);
    backdrop-filter: blur(16px) saturate(1.08);
    -webkit-backdrop-filter: blur(16px) saturate(1.08);
  }

  .mobile-page-button {
    width: 42px;
    height: 48px;
    border-radius: 50%;
  }

  .progress-block {
    padding: 8px 1px 9px;
  }

  .progress-meta {
    gap: 8px;
    margin-bottom: 8px;
  }

  .progress-meta > span {
    font-size: 8px;
  }

  #pageCounter strong {
    font-size: 12px;
  }

  .thumb-panel {
    top: 68px;
    right: 12px;
    bottom: 88px;
    left: 12px;
    width: auto;
    border-radius: 3px;
    transform: translateY(18px);
  }

  .app.panel-open .thumb-panel {
    transform: translateY(0);
  }

  .panel-backdrop {
    display: block;
  }

  .app.panel-open .panel-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .thumb-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    padding: 12px;
  }

  .thumb-item {
    display: flex;
    min-width: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin: 0;
    padding: 7px;
    border: 1px solid var(--hairline-soft);
  }

  .thumb-item::before {
    top: 0;
    right: 0;
    bottom: auto;
    left: 0;
    width: auto;
    height: 1px;
    transform: scaleX(0);
  }

  .thumb-item.active::before {
    transform: scaleX(1);
  }

  .thumb-image {
    width: 100%;
  }

  .thumb-item:first-child .thumb-image,
  .thumb-item:last-child .thumb-image {
    width: 50%;
    align-self: center;
  }

  .thumb-item.is-page-thumb .thumb-image {
    width: 76%;
    align-self: center;
    aspect-ratio: .7067;
    border-radius: 1px 4px 4px 1px;
  }

  .thumb-copy {
    gap: 3px;
  }

  .thumb-copy strong {
    font-size: 10px;
  }

  .thumb-copy span {
    font-size: 7px;
  }

  .toast {
    top: 68px;
    max-width: calc(100vw - 32px);
    white-space: nowrap;
  }
}

@media (max-width: 390px) {
  .brand-copy span {
    max-width: 138px;
  }

  #shareButton {
    display: grid;
  }

  .zoom-tools .zoom-value,
  .zoom-tools button:nth-child(2) {
    display: none;
  }

  .zoom-tools button:first-child {
    border-right: 1px solid var(--hairline-soft);
  }
}

@media (max-height: 700px) and (min-width: 901px) and (hover: hover) {
  .topbar {
    height: 68px;
  }

  .reader {
    height: calc(100dvh - 68px);
    grid-template-rows: minmax(0, 1fr) 64px;
  }

  .book-frame,
  .book-frame.is-single {
    width: min(76vw, calc((100dvh - 154px) * var(--book-ratio)));
  }

  .reader-controls {
    padding-top: 2px;
    padding-bottom: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}