:root {
  --cream-50: #fffaf4;
  --cream-100: #f7efe4;
  --cream-200: #efe2d2;
  --blush-100: #f5dfe4;
  --blush-200: #ebc6cf;
  --rose-300: #d89daa;
  --rose-500: #b77987;
  --taupe-200: #dbc8b2;
  --taupe-400: #ad927d;
  --ink-700: #5f4b46;
  --ink-900: #382c2b;
  --paper-shadow: 0 28px 80px rgba(98, 69, 56, 0.18);
  --soft-shadow: 0 18px 40px rgba(125, 94, 82, 0.14);
  --page-radius: 30px;
  --page-padding: clamp(1.4rem, 2vw, 2rem);
  --stage-width: min(1120px, calc(100vw - 2rem));
  --stage-height: min(760px, calc(100svh - 7rem));
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", "STSong", "Songti SC", serif;
  --sans: "Avenir Next", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --ease-gentle: cubic-bezier(0.2, 0.7, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink-900);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.9), transparent 28%),
    radial-gradient(circle at 80% 16%, rgba(255, 240, 244, 0.92), transparent 22%),
    linear-gradient(135deg, #fcf7f0 0%, #f8ede2 48%, #f7ebe8 100%);
  overflow: hidden;
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 0;
  background: none;
  padding: 0;
}

.ambient {
  position: fixed;
  inset: auto;
  border-radius: 999px;
  filter: blur(10px);
  opacity: 0.5;
  pointer-events: none;
}

.ambient--rose {
  width: min(46vw, 560px);
  height: min(46vw, 560px);
  top: -10rem;
  right: -8rem;
  background: radial-gradient(circle, rgba(244, 205, 214, 0.8) 0%, rgba(244, 205, 214, 0) 70%);
}

.ambient--cream {
  width: min(52vw, 620px);
  height: min(52vw, 620px);
  bottom: -14rem;
  left: -10rem;
  background: radial-gradient(circle, rgba(255, 248, 234, 0.92) 0%, rgba(255, 248, 234, 0) 70%);
}

.sparkles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.sparkles span {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 0 18px rgba(255, 255, 255, 0.8);
  animation: drift 11s linear infinite;
}

.sparkles span:nth-child(1) {
  top: 16%;
  left: 12%;
  animation-duration: 12s;
}

.sparkles span:nth-child(2) {
  top: 28%;
  left: 78%;
  width: 10px;
  height: 10px;
  animation-duration: 16s;
}

.sparkles span:nth-child(3) {
  top: 66%;
  left: 10%;
  animation-duration: 14s;
}

.sparkles span:nth-child(4) {
  top: 20%;
  left: 55%;
  width: 6px;
  height: 6px;
  animation-duration: 13s;
}

.sparkles span:nth-child(5) {
  top: 74%;
  left: 86%;
  animation-duration: 15s;
}

.sparkles span:nth-child(6) {
  top: 84%;
  left: 44%;
  width: 5px;
  height: 5px;
  animation-duration: 17s;
}

.book-app {
  position: relative;
  z-index: 1;
  min-height: 100svh;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

.book-chrome,
.book-footer {
  width: min(1180px, calc(100vw - 2rem));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.book-mark {
  margin: 0;
  color: rgba(95, 75, 70, 0.72);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.75rem;
}

.music-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.95rem;
  padding: 0.7rem 1.05rem 0.7rem 0.78rem;
  border-radius: 999px;
  background:
    linear-gradient(145deg, rgba(255, 251, 246, 0.96), rgba(248, 236, 226, 0.88));
  border: 1px solid rgba(191, 156, 138, 0.24);
  box-shadow:
    0 16px 34px rgba(110, 82, 72, 0.13),
    inset 0 1px 0 rgba(255, 255, 255, 0.88);
  color: var(--ink-700);
  cursor: pointer;
  backdrop-filter: blur(18px);
  transition: transform 0.32s var(--ease-gentle), box-shadow 0.32s var(--ease-gentle);
}

.music-toggle:hover {
  transform: translateY(-2px);
  box-shadow:
    0 18px 38px rgba(110, 82, 72, 0.17),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.music-toggle.is-playing .music-toggle__disc {
  animation: spin 4.6s linear infinite;
}

.music-toggle.is-playing .music-toggle__visual::after {
  opacity: 1;
  transform: scale(1);
}

.music-toggle.is-disabled {
  opacity: 0.78;
}

.music-toggle__visual {
  position: relative;
  width: 3.25rem;
  height: 3.25rem;
  flex: 0 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 30% 28%, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0) 46%),
    linear-gradient(145deg, rgba(255, 248, 241, 0.94), rgba(239, 221, 210, 0.78));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.92),
    0 10px 24px rgba(118, 84, 76, 0.15);
}

.music-toggle__visual::after {
  content: "";
  position: absolute;
  inset: -0.28rem;
  border-radius: 50%;
  border: 1px solid rgba(208, 163, 172, 0.26);
  opacity: 0.55;
  transform: scale(0.96);
  transition: opacity 0.32s var(--ease-gentle), transform 0.32s var(--ease-gentle);
}

.music-toggle__disc {
  width: 2.22rem;
  aspect-ratio: 1;
  border-radius: 50%;
  position: relative;
  background:
    radial-gradient(circle at center, #fff7ef 0 0.24rem, rgba(255, 255, 255, 0) 0.26rem),
    radial-gradient(circle at center, rgba(255, 255, 255, 0.16) 0 0.82rem, rgba(255, 255, 255, 0) 0.84rem),
    repeating-radial-gradient(circle at center, #8c5c5f 0 0.18rem, #b57c85 0.18rem 0.34rem, #d8a7ae 0.34rem 0.48rem);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.42),
    0 6px 16px rgba(115, 80, 78, 0.2);
}

.music-toggle__disc::before {
  content: "";
  position: absolute;
  inset: 17% 17% auto auto;
  width: 0.55rem;
  height: 0.22rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.56);
  transform: rotate(28deg);
}

.music-toggle__disc::after {
  content: "";
  position: absolute;
  inset: 50%;
  width: 0.34rem;
  height: 0.34rem;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: rgba(255, 255, 255, 0.92);
}

.music-toggle__arm {
  position: absolute;
  top: 0.42rem;
  right: 0.3rem;
  width: 1rem;
  height: 0.22rem;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(176, 140, 128, 0.95), rgba(116, 88, 80, 0.95));
  transform: rotate(36deg);
  transform-origin: right center;
  box-shadow: 0 2px 6px rgba(108, 76, 70, 0.16);
}

.music-toggle__arm::after {
  content: "";
  position: absolute;
  right: -0.12rem;
  top: 50%;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  transform: translateY(-50%);
  background: rgba(255, 249, 243, 0.95);
  border: 1px solid rgba(177, 141, 128, 0.55);
}

.music-toggle__text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.08rem;
}

.music-toggle__text strong {
  font-size: 0.94rem;
  font-weight: 700;
}

.music-toggle__text em {
  font-style: normal;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(95, 75, 70, 0.75);
}

.book-stage {
  position: relative;
  width: var(--stage-width);
  height: var(--stage-height);
  min-height: 540px;
  margin: 0 auto;
  padding: 1.5rem;
  border-radius: 36px;
  background:
    linear-gradient(145deg, rgba(255, 248, 239, 0.65), rgba(248, 236, 225, 0.82)),
    linear-gradient(160deg, rgba(255, 255, 255, 0.26), rgba(255, 255, 255, 0));
  border: 1px solid rgba(190, 157, 140, 0.2);
  box-shadow:
    0 28px 80px rgba(92, 65, 54, 0.13),
    inset 0 1px 0 rgba(255, 255, 255, 0.65);
  overflow: hidden;
}

.book-stage__glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 16%, rgba(255, 255, 255, 0.75), transparent 20%),
    radial-gradient(circle at 82% 28%, rgba(255, 240, 245, 0.5), transparent 18%),
    radial-gradient(circle at 50% 88%, rgba(255, 255, 255, 0.45), transparent 22%);
  pointer-events: none;
}

.book-stage__spine {
  position: absolute;
  top: 8%;
  bottom: 8%;
  left: 50%;
  width: 4rem;
  transform: translateX(-50%);
  background:
    linear-gradient(90deg, rgba(111, 88, 74, 0.07), rgba(255, 255, 255, 0.55) 40%, rgba(100, 72, 63, 0.12) 55%, rgba(255, 255, 255, 0.18));
  filter: blur(0.4px);
  opacity: 0.8;
  pointer-events: none;
}

.book-stage__shadow {
  position: absolute;
  inset: auto 7% 7% 7%;
  height: 3rem;
  background: radial-gradient(circle, rgba(82, 53, 47, 0.18), rgba(82, 53, 47, 0) 70%);
  filter: blur(14px);
  opacity: 0.45;
  pointer-events: none;
}

.book-stage__ornaments {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.book-stage__petal,
.book-stage__dot {
  position: absolute;
  pointer-events: none;
}

.book-stage__petal {
  width: 1.4rem;
  height: 2.4rem;
  border-radius: 60% 60% 70% 70%;
  background: linear-gradient(180deg, rgba(245, 211, 220, 0.86), rgba(237, 195, 204, 0.3));
  filter: blur(0.2px);
  box-shadow: 0 12px 20px rgba(198, 145, 157, 0.08);
}

.book-stage__petal--1 {
  top: 10%;
  left: 5%;
  transform: rotate(-18deg);
}

.book-stage__petal--2 {
  top: 18%;
  right: 7%;
  width: 1.1rem;
  height: 2rem;
  transform: rotate(22deg);
}

.book-stage__petal--3 {
  bottom: 17%;
  left: 7%;
  width: 1rem;
  height: 1.8rem;
  transform: rotate(34deg);
}

.book-stage__petal--4 {
  bottom: 13%;
  right: 5%;
  transform: rotate(-24deg);
}

.book-stage__petal--5 {
  top: 50%;
  right: 11%;
  width: 0.82rem;
  height: 1.5rem;
  transform: rotate(10deg);
}

.book-stage__dot {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.7);
}

.book-stage__dot--1 {
  top: 12%;
  right: 13%;
}

.book-stage__dot--2 {
  bottom: 18%;
  right: 12%;
  width: 0.3rem;
  height: 0.3rem;
}

.book-stage__dot--3 {
  bottom: 24%;
  left: 9%;
  width: 0.24rem;
  height: 0.24rem;
}

.page-window {
  position: relative;
  height: 100%;
}

.page-stack {
  position: relative;
  height: 100%;
  perspective: 2400px;
  transform-style: preserve-3d;
}

.page {
  position: absolute;
  inset: 0;
  display: grid;
  padding: var(--page-padding);
  border-radius: var(--page-radius);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.985)),
    linear-gradient(135deg, rgba(249, 241, 230, 0.52), rgba(255, 255, 255, 0.28));
  box-shadow: var(--paper-shadow);
  border: 1px solid rgba(200, 169, 148, 0.26);
  overflow: hidden;
  opacity: 0;
  transform-origin: left center;
  transform: translateX(12%) rotateY(16deg) scale(0.985);
  transition:
    transform 0.72s var(--ease-gentle),
    opacity 0.48s ease,
    filter 0.72s var(--ease-gentle),
    box-shadow 0.72s var(--ease-gentle);
  pointer-events: none;
  filter: saturate(0.94);
}

.page::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(173, 146, 125, 0.06), transparent 14%, transparent 84%, rgba(173, 146, 125, 0.04)),
    radial-gradient(circle at top right, rgba(255, 238, 242, 0.36), transparent 26%);
  pointer-events: none;
}

.page::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: calc(var(--page-radius) - 10px);
  border: 1px solid rgba(224, 201, 183, 0.44);
  pointer-events: none;
}

.page.is-active {
  z-index: 4;
  opacity: 1;
  transform: translateX(0) rotateY(0deg) scale(1);
  pointer-events: auto;
  filter: none;
  box-shadow: 0 34px 92px rgba(98, 69, 56, 0.2);
  backdrop-filter: blur(6px);
}

.page.is-prev {
  z-index: 3;
  opacity: 0.06;
  transform: translateX(-7%) rotateY(-13deg) scale(0.982);
  filter: saturate(0.72) blur(1.6px);
}

.page.is-next {
  z-index: 2;
  opacity: 0.035;
  transform: translateX(10%) rotateY(18deg) scale(0.99);
  filter: saturate(0.68) blur(1.2px);
}

.page.is-before {
  z-index: 1;
  opacity: 0;
  transform: translateX(-15%) rotateY(-18deg) scale(0.975);
}

.page.is-after {
  z-index: 0;
  opacity: 0;
  transform: translateX(16%) rotateY(22deg) scale(0.975);
}

.page__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1.25rem;
  min-height: 0;
}

.page-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  align-self: flex-start;
  color: var(--rose-500);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.74rem;
}

.page-kicker::before {
  content: "";
  width: 2.8rem;
  height: 1px;
  background: linear-gradient(90deg, rgba(183, 121, 135, 0), rgba(183, 121, 135, 0.8));
}

.display-cn,
.section-title__cn,
.message-title__cn,
.ending-title__cn,
.photo-spread__title {
  font-family: var(--serif);
  letter-spacing: 0.02em;
  color: var(--ink-900);
}

.display-cn {
  margin: 0;
  font-size: clamp(2.7rem, 7vw, 5.5rem);
  line-height: 0.96;
}

.display-en {
  margin: 0;
  color: rgba(95, 75, 70, 0.66);
  font-size: 0.95rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}

.section-title__cn,
.message-title__cn,
.ending-title__cn,
.photo-spread__title {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.1;
}

.section-title__en,
.message-title__en,
.ending-title__en {
  margin: 0;
  color: rgba(95, 75, 70, 0.7);
  font-size: 0.82rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.body-copy {
  margin: 0;
  font-size: clamp(0.98rem, 1.3vw, 1.12rem);
  line-height: 1.95;
  color: rgba(66, 49, 44, 0.92);
}

.caption-en {
  margin: 0;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: rgba(95, 75, 70, 0.68);
  text-transform: uppercase;
}

.soft-button,
.outline-button,
.nav-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  cursor: pointer;
  transition:
    transform 0.28s var(--ease-gentle),
    background-color 0.28s var(--ease-gentle),
    border-color 0.28s var(--ease-gentle),
    box-shadow 0.28s var(--ease-gentle),
    opacity 0.28s ease;
}

.soft-button,
.outline-button {
  min-height: 3.25rem;
  padding: 0.9rem 1.25rem;
  border-radius: 999px;
  font-weight: 700;
}

.soft-button {
  background: linear-gradient(135deg, #d18c99, #c47f89);
  color: #fffaf7;
  box-shadow: 0 16px 30px rgba(183, 121, 135, 0.25);
}

.soft-button:hover,
.outline-button:hover,
.nav-button:hover:not(:disabled) {
  transform: translateY(-2px);
}

.outline-button {
  border: 1px solid rgba(183, 121, 135, 0.32);
  color: var(--rose-500);
  background: rgba(255, 250, 244, 0.74);
}

.button-dual {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.05;
}

.button-dual strong {
  font-size: 0.96rem;
}

.button-dual span {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.78;
}

.button-dual span:empty,
.music-toggle__text em:empty {
  display: none;
}

.page-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.page-note {
  margin: 0;
  color: rgba(95, 75, 70, 0.72);
  font-size: 0.9rem;
  line-height: 1.8;
}

.cover-page {
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  align-items: stretch;
}

.cover-copy {
  display: grid;
  align-content: space-between;
  gap: 1.2rem;
  padding: 0.5rem 0;
}

.cover-copy__top {
  display: grid;
  gap: 1rem;
  max-width: 34rem;
}

.cover-subtitle {
  margin: 0;
  max-width: 31rem;
  color: rgba(66, 49, 44, 0.8);
  font-size: clamp(1rem, 1.55vw, 1.12rem);
  line-height: 1.9;
}

.cover-poem {
  display: grid;
  gap: 0.3rem;
  margin: 0;
  color: rgba(95, 75, 70, 0.76);
  font-size: 0.94rem;
  line-height: 1.8;
}

.cover-visual {
  position: relative;
  min-height: 100%;
  display: grid;
  place-items: center;
}

.cover-frame {
  position: relative;
  width: min(100%, 420px);
  aspect-ratio: 0.82;
  border-radius: 34px;
  padding: 1rem;
  background:
    linear-gradient(145deg, rgba(255, 252, 246, 0.85), rgba(247, 234, 223, 0.7));
  box-shadow:
    0 24px 55px rgba(91, 63, 54, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.72);
}

.cover-frame::before {
  content: "";
  position: absolute;
  inset: 1rem;
  border-radius: 26px;
  border: 1px solid rgba(214, 177, 163, 0.5);
  pointer-events: none;
}

.cover-frame__inner {
  position: relative;
  height: 100%;
  border-radius: 26px;
  overflow: hidden;
  background:
    linear-gradient(150deg, rgba(255, 240, 244, 0.7), rgba(255, 248, 236, 0.88)),
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.9), transparent 35%);
}

.cover-frame__photo {
  position: absolute;
  inset: 16% 13% 19% 13%;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--soft-shadow);
  background: linear-gradient(135deg, rgba(237, 219, 205, 0.55), rgba(255, 255, 255, 0.7));
}

.cover-frame__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.cover-frame__photo.is-missing img {
  opacity: 0;
}

.cover-frame__photo.is-missing::before {
  content: "Cover Photo";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgba(95, 75, 70, 0.72);
  font-size: 0.84rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background:
    linear-gradient(135deg, rgba(244, 225, 216, 0.86), rgba(255, 252, 248, 0.96));
}

.cover-frame__seal {
  position: absolute;
  top: 7.5%;
  right: 8%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 5rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, #fff4f5, #d9a6b0 68%);
  box-shadow:
    0 14px 28px rgba(159, 105, 118, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.cover-frame__seal::before,
.cover-frame__seal::after {
  content: "";
  position: absolute;
  background: rgba(255, 247, 248, 0.92);
}

.cover-frame__seal::before {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 54% 46% 60% 40%;
  transform: rotate(-35deg) translate(-0.18rem, -0.08rem);
}

.cover-frame__seal::after {
  width: 0.92rem;
  height: 0.92rem;
  border-radius: 46% 54% 40% 60%;
  transform: rotate(28deg) translate(0.26rem, 0.18rem);
}

.cover-frame__ribbon {
  position: absolute;
  top: -0.2rem;
  left: 50%;
  width: 7rem;
  height: 11rem;
  transform: translateX(-50%);
  background:
    linear-gradient(180deg, rgba(240, 191, 201, 0.95), rgba(206, 138, 151, 0.82));
  clip-path: polygon(50% 0, 100% 8%, 76% 100%, 50% 88%, 24% 100%, 0 8%);
  opacity: 0.78;
  filter: drop-shadow(0 20px 16px rgba(176, 119, 135, 0.18));
}

.cover-frame__label {
  position: absolute;
  bottom: 10%;
  left: 10%;
  right: 10%;
  padding: 0.95rem 1rem;
  border-radius: 18px;
  background: rgba(255, 250, 244, 0.76);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 20px rgba(118, 84, 76, 0.12);
}

.cover-frame__label p {
  margin: 0;
  line-height: 1.6;
}

.cover-frame__label strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.18rem;
  color: var(--ink-900);
}

.cover-frame__label span {
  display: block;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(95, 75, 70, 0.65);
}

.letter-page {
  grid-template-columns: minmax(240px, 0.75fr) minmax(0, 1.25fr);
  gap: 1.5rem;
  align-items: stretch;
}

.letter-aside {
  padding: 1rem 1rem 1rem 0.4rem;
  display: grid;
  align-content: start;
  gap: 1rem;
}

.letter-aside__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: rgba(95, 75, 70, 0.72);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.letter-aside__badge::before {
  content: "";
  width: 2.6rem;
  height: 1px;
  background: rgba(183, 121, 135, 0.55);
}

.letter-panel {
  position: relative;
  padding: clamp(1.3rem, 2vw, 1.9rem);
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(255, 253, 249, 0.92), rgba(250, 244, 236, 0.88));
  box-shadow: var(--soft-shadow);
  display: grid;
  align-content: space-between;
  gap: 1rem;
}

.letter-panel::before {
  content: "";
  position: absolute;
  inset: 1.1rem;
  border-radius: 20px;
  background:
    repeating-linear-gradient(
      180deg,
      rgba(195, 166, 144, 0.05) 0,
      rgba(195, 166, 144, 0.05) 1px,
      transparent 1px,
      transparent 2.15rem
    );
  pointer-events: none;
}

.letter-body {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1rem;
}

.letter-signature {
  position: relative;
  z-index: 1;
  justify-self: end;
  display: grid;
  gap: 0.25rem;
  text-align: right;
  color: rgba(95, 75, 70, 0.74);
}

.letter-signature strong {
  font-family: var(--serif);
  font-size: 1.08rem;
  color: var(--ink-900);
}

.album-page {
  grid-template-columns: minmax(0, 1.05fr) minmax(260px, 0.95fr);
  gap: 1.4rem;
  align-items: stretch;
}

.album-copy {
  display: grid;
  align-content: center;
  gap: 1rem;
  padding-right: 1rem;
}

.album-copy ul {
  display: grid;
  gap: 0.7rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.album-copy li {
  position: relative;
  padding-left: 1.1rem;
  color: rgba(66, 49, 44, 0.88);
  line-height: 1.8;
}

.album-copy li::before {
  content: "";
  position: absolute;
  top: 0.82rem;
  left: 0;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: rgba(183, 121, 135, 0.7);
}

.album-visual {
  position: relative;
  display: grid;
  align-content: center;
  justify-items: center;
}

.album-board {
  width: min(100%, 420px);
  padding: 1.2rem;
  border-radius: 28px;
  background:
    linear-gradient(160deg, rgba(255, 249, 241, 0.94), rgba(245, 233, 222, 0.85));
  box-shadow: var(--soft-shadow);
  transform: rotate(1deg);
}

.album-board__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.95rem;
}

.album-board__card {
  padding: 0.6rem;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 10px 20px rgba(111, 81, 72, 0.12);
}

.album-board__card:nth-child(1) {
  transform: rotate(-4deg);
}

.album-board__card:nth-child(2) {
  transform: translateY(1rem) rotate(4deg);
}

.album-board__card:nth-child(3) {
  transform: translateY(-0.6rem) rotate(3deg);
}

.album-board__card:nth-child(4) {
  transform: rotate(-3deg);
}

.album-board__thumb {
  position: relative;
  aspect-ratio: 0.84;
  border-radius: 14px;
  background:
    linear-gradient(135deg, rgba(244, 224, 213, 0.88), rgba(255, 255, 255, 0.94));
  overflow: hidden;
}

.album-board__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.album-board__thumb.is-missing img {
  opacity: 0;
}

.album-board__thumb.is-missing::before {
  content: "";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle, rgba(255, 255, 255, 0.52) 0 0.28rem, rgba(255, 255, 255, 0) 0.3rem);
}

.album-board__meta {
  margin: 0.55rem 0 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(95, 75, 70, 0.72);
}

.photo-page {
  grid-template-rows: minmax(0, 1fr);
}

.photo-spread__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
}

.photo-spread__meta {
  display: grid;
  gap: 0.35rem;
}

.photo-spread__count {
  margin: 0;
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(95, 75, 70, 0.68);
}

.photo-spread__note {
  margin: 0;
  color: rgba(95, 75, 70, 0.74);
  font-size: 0.9rem;
  line-height: 1.7;
}

.photo-spread__footer {
  display: flex;
  justify-content: center;
  padding-inline: 0.25rem;
}

.photo-spread__footer .photo-spread__note {
  max-width: 34rem;
  text-align: center;
}

.photo-spread__layout {
  position: relative;
  display: grid;
  gap: 1rem;
  min-height: 0;
  overflow: visible;
}

.photo-spread__layout--duet {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.photo-spread__layout--duet-alt {
  grid-template-columns: 1.15fr 0.85fr;
}

.photo-spread__layout--trio-feature {
  grid-template-columns: 1.25fr 0.75fr;
  grid-template-rows: repeat(2, minmax(0, 1fr));
}

.photo-spread__layout--trio-feature .photo-card:first-child {
  grid-row: 1 / span 2;
}

.photo-spread__layout--trio-postcards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.photo-spread__layout--quartet-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
}

.photo-spread__layout--quartet-postcards {
  grid-template-columns: 1.15fr 0.85fr;
  grid-template-rows: repeat(3, minmax(0, 1fr));
}

.photo-spread__layout--quartet-postcards .photo-card:first-child {
  grid-row: 1 / span 2;
}

.photo-spread__layout--solo-center {
  grid-template-columns: minmax(0, 1fr);
  align-content: center;
  justify-items: center;
}

.photo-spread__layout--solo-center .photo-card {
  width: min(100%, 33rem);
  padding: 0.95rem;
}

.photo-spread__layout--solo-center .photo-card__frame {
  aspect-ratio: 0.82;
}

.photo-card {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 0;
  gap: 0.7rem;
  padding: 0.75rem;
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255, 253, 247, 0.96), rgba(249, 241, 232, 0.92));
  box-shadow: 0 16px 36px rgba(111, 81, 72, 0.12);
  transition: transform 0.32s var(--ease-gentle), box-shadow 0.32s var(--ease-gentle);
}

.photo-spread__quote {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  width: min(12rem, 32%);
  min-height: 5.4rem;
  padding: 1rem 1.05rem;
  border-radius: 22px 20px 24px 18px;
  background:
    linear-gradient(155deg, rgba(255, 251, 246, 0.94), rgba(247, 235, 224, 0.92));
  border: 1px solid rgba(209, 177, 154, 0.32);
  box-shadow:
    0 18px 34px rgba(111, 81, 72, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(12px);
  pointer-events: none;
}

.photo-spread__quote::before {
  content: "";
  position: absolute;
  top: -0.32rem;
  left: 50%;
  width: 3.2rem;
  height: 0.9rem;
  border-radius: 999px;
  background: rgba(235, 212, 185, 0.74);
  box-shadow: 0 4px 10px rgba(122, 93, 81, 0.08);
  transform: translateX(-50%) rotate(-4deg);
}

.photo-spread__quote span {
  display: block;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(0.94rem, 1vw, 1rem);
  line-height: 1.72;
  letter-spacing: 0.02em;
  color: rgba(76, 57, 51, 0.86);
  text-align: center;
}

.photo-spread__quote--duet {
  left: 50%;
  bottom: 5%;
  transform: translateX(-50%) rotate(-4deg);
}

.photo-spread__quote--duet-alt {
  right: 4%;
  bottom: 8%;
  width: min(11rem, 28%);
  transform: rotate(3deg);
}

.photo-spread__quote--trio-feature {
  left: 58%;
  top: 50%;
  width: min(10rem, 20%);
  min-height: 6.4rem;
  transform: translate(-50%, -50%) rotate(-5deg);
}

.photo-spread__quote--trio-postcards {
  left: 50%;
  bottom: 8%;
  width: min(11rem, 24%);
  transform: translateX(-50%) rotate(-3deg);
}

.photo-spread__quote--quartet-grid {
  left: 50%;
  top: 50%;
  width: min(10.5rem, 24%);
  min-height: 6rem;
  transform: translate(-50%, -50%) rotate(-4deg);
}

.photo-spread__quote--quartet-postcards {
  left: 57%;
  bottom: 12%;
  width: min(10.8rem, 24%);
  transform: translateX(-50%) rotate(4deg);
}

.photo-spread__quote--solo-center {
  right: 6%;
  bottom: 7%;
  width: min(13rem, 30%);
  transform: rotate(-3deg);
}

.photo-card:hover {
  transform: translateY(-4px) rotate(-0.3deg);
  box-shadow: 0 20px 38px rgba(111, 81, 72, 0.15);
}

.photo-card::before,
.photo-card::after {
  content: "";
  position: absolute;
  top: 0.55rem;
  width: 3.25rem;
  height: 0.9rem;
  border-radius: 999px;
  background: rgba(240, 219, 192, 0.58);
  box-shadow: 0 2px 5px rgba(122, 93, 81, 0.08);
  pointer-events: none;
}

.photo-card::before {
  left: 1rem;
  transform: rotate(-8deg);
}

.photo-card::after {
  right: 1rem;
  transform: rotate(8deg);
}

.photo-card[data-frame="wide"] .photo-card__frame {
  aspect-ratio: 1.45;
}

.photo-card[data-frame="tall"] .photo-card__frame {
  aspect-ratio: 0.76;
}

.photo-card[data-frame="square"] .photo-card__frame {
  aspect-ratio: 1;
}

.photo-card__frame {
  position: relative;
  min-height: 0;
  border-radius: 18px;
  overflow: hidden;
  aspect-ratio: 0.88;
  background:
    linear-gradient(135deg, rgba(238, 220, 205, 0.75), rgba(255, 255, 255, 0.92)),
    radial-gradient(circle at top, rgba(255, 255, 255, 0.72), transparent 40%);
}

.photo-card__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: var(--photo-position, center center);
  display: block;
}

.photo-card.is-missing .photo-card__frame img {
  opacity: 0;
}

.photo-card.is-missing .photo-card__frame::before {
  content: "Photo Placeholder";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  text-align: center;
  color: rgba(95, 75, 70, 0.74);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  background:
    linear-gradient(135deg, rgba(244, 225, 216, 0.86), rgba(255, 252, 248, 0.96));
}

.photo-card__caption {
  display: grid;
  gap: 0.25rem;
  padding-inline: 0.25rem;
}

.photo-card__caption strong {
  font-size: 0.98rem;
  color: var(--ink-900);
}

.photo-card__caption span {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(95, 75, 70, 0.68);
}

.message-page,
.ending-page {
  place-items: center;
}

.message-shell,
.ending-shell {
  position: relative;
  display: grid;
  gap: 1rem;
  width: min(100%, 780px);
  text-align: center;
  padding: clamp(1.4rem, 3vw, 2.4rem);
}

.message-shell::before,
.ending-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 30px;
  background:
    linear-gradient(145deg, rgba(255, 252, 248, 0.74), rgba(249, 239, 230, 0.64));
  box-shadow: var(--soft-shadow);
}

.message-shell > *,
.ending-shell > * {
  position: relative;
  z-index: 1;
}

.message-body {
  display: grid;
  gap: 0.9rem;
  text-align: left;
}

.message-body .body-copy:first-child::first-letter {
  float: left;
  margin-right: 0.35rem;
  font-family: var(--serif);
  font-size: 3rem;
  line-height: 0.9;
  color: var(--rose-500);
}

.message-sign {
  justify-self: end;
  text-align: right;
  color: rgba(95, 75, 70, 0.76);
}

.message-sign strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.06rem;
  color: var(--ink-900);
}

.ending-page {
  background:
    radial-gradient(circle at 50% 16%, rgba(254, 212, 150, 0.09), transparent 16%),
    linear-gradient(180deg, rgba(11, 8, 16, 0.98), rgba(29, 16, 34, 0.98));
  isolation: isolate;
}

.ending-shell {
  width: min(100%, 880px);
  min-height: 100%;
  padding: 0;
}

.ending-shell::before {
  display: none;
}

.ending-scene {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 100%;
  padding: clamp(1.6rem, 2.5vw, 2.3rem);
  border-radius: 30px;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 18%, rgba(255, 233, 204, 0.08), transparent 18%),
    linear-gradient(180deg, rgba(19, 13, 23, 0.98), rgba(38, 18, 41, 0.98));
  box-shadow:
    0 24px 60px rgba(8, 5, 15, 0.38),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.ending-scene::before,
.ending-scene::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  transition:
    opacity 1.8s var(--ease-gentle),
    transform 1.8s var(--ease-gentle),
    filter 1.8s var(--ease-gentle),
    background 1.8s var(--ease-gentle);
}

.ending-scene::before {
  background:
    radial-gradient(circle at 50% 14%, rgba(255, 206, 122, 0.18), transparent 11%),
    radial-gradient(circle at 50% 23%, rgba(255, 226, 188, 0.06), transparent 20%),
    linear-gradient(180deg, rgba(10, 7, 15, 0.12), rgba(10, 7, 15, 0.56));
  opacity: 0.92;
}

.ending-scene::after {
  background:
    radial-gradient(circle at 50% 38%, rgba(255, 230, 183, 0.58), transparent 20%),
    radial-gradient(circle at 20% 24%, rgba(221, 162, 190, 0.24), transparent 26%),
    radial-gradient(circle at 82% 30%, rgba(255, 202, 171, 0.18), transparent 28%),
    linear-gradient(180deg, rgba(42, 20, 35, 0.32), rgba(92, 52, 70, 0.12));
  opacity: 0;
  transform: scale(0.94);
  filter: blur(8px);
}

.ending-page.is-lit .ending-scene::before {
  opacity: 0.25;
}

.ending-page.is-lit .ending-scene::after {
  opacity: 1;
  transform: scale(1);
  filter: blur(0);
}

.ending-page .page-kicker {
  position: absolute;
  top: 1.6rem;
  left: 1.7rem;
  color: rgba(255, 236, 228, 0.8);
}

.ending-page .page-kicker::before {
  background: linear-gradient(90deg, rgba(255, 215, 198, 0), rgba(255, 215, 198, 0.76));
}

.ending-scene__stars {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.ending-scene__stars span {
  position: absolute;
  width: 0.36rem;
  height: 0.36rem;
  border-radius: 50%;
  background: rgba(255, 241, 225, 0.46);
  box-shadow: 0 0 16px rgba(255, 231, 198, 0.38);
  transition: opacity 1.6s var(--ease-gentle), transform 1.6s var(--ease-gentle), background-color 1.6s var(--ease-gentle);
}

.ending-scene__stars span:nth-child(1) {
  top: 14%;
  left: 18%;
}

.ending-scene__stars span:nth-child(2) {
  top: 20%;
  right: 18%;
  width: 0.28rem;
  height: 0.28rem;
}

.ending-scene__stars span:nth-child(3) {
  bottom: 23%;
  left: 23%;
  width: 0.24rem;
  height: 0.24rem;
}

.ending-scene__stars span:nth-child(4) {
  bottom: 18%;
  right: 25%;
}

.ending-page.is-lit .ending-scene__stars span {
  background: rgba(255, 245, 233, 0.92);
  box-shadow: 0 0 22px rgba(255, 228, 186, 0.78);
  transform: scale(1.2);
}

.ending-cake-button {
  position: relative;
  z-index: 2;
  width: min(100%, 18rem);
  aspect-ratio: 0.82;
  display: grid;
  place-items: center;
  border-radius: 34px;
  cursor: pointer;
  transition: transform 0.55s var(--ease-gentle), filter 0.55s var(--ease-gentle);
}

.ending-cake-button:hover {
  transform: translateY(-0.3rem) scale(1.015);
}

.ending-cake-button__halo {
  position: absolute;
  inset: -1.2rem;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(255, 220, 169, 0.26) 0%, rgba(255, 220, 169, 0) 70%);
  filter: blur(12px);
  opacity: 0.42;
  transition: opacity 1.6s var(--ease-gentle), transform 1.6s var(--ease-gentle);
}

.ending-page.is-lit .ending-cake-button__halo {
  opacity: 1;
  transform: scale(1.08);
}

.ending-cake-button__frame,
.ending-portrait__frame {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(54, 33, 43, 0.95), rgba(27, 16, 29, 0.96));
}

.ending-cake-button__frame {
  border-radius: 30px;
  box-shadow:
    0 22px 48px rgba(5, 3, 10, 0.48),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.ending-cake-button__frame::after {
  content: "";
  position: absolute;
  top: 10%;
  left: 50%;
  width: 1.5rem;
  height: 2.2rem;
  transform: translateX(-50%);
  border-radius: 55% 45% 48% 52%;
  background:
    radial-gradient(circle at 50% 18%, rgba(255, 255, 255, 0.96), rgba(255, 246, 198, 0.88) 20%, rgba(255, 183, 68, 0.96) 58%, rgba(255, 134, 35, 0.1) 100%);
  filter: blur(1px);
  mix-blend-mode: screen;
  opacity: 0.94;
  animation: candlePulse 2.4s ease-in-out infinite;
  pointer-events: none;
}

.ending-cake-button__frame img,
.ending-portrait__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.ending-cake-button__frame img {
  transform: scale(1.02);
}

.ending-cake-button__frame.is-missing img,
.ending-portrait__frame.is-missing img {
  opacity: 0;
}

.ending-cake-button__frame.is-missing::before,
.ending-portrait__frame.is-missing::before {
  content: "";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background:
    linear-gradient(135deg, rgba(62, 36, 45, 0.96), rgba(27, 16, 29, 0.96));
}

.ending-portrait {
  position: absolute;
  right: 8%;
  bottom: 8%;
  width: min(26vw, 15.5rem);
  transform: translateY(1.2rem) rotate(4deg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.5s var(--ease-gentle), transform 1.5s var(--ease-gentle);
}

.ending-page.is-lit .ending-portrait {
  opacity: 1;
  transform: translateY(0) rotate(4deg);
  pointer-events: auto;
}

.ending-portrait__frame {
  aspect-ratio: 0.8;
  border-radius: 24px;
  padding: 0.7rem;
  background:
    linear-gradient(150deg, rgba(255, 249, 242, 0.88), rgba(255, 232, 221, 0.62));
  box-shadow:
    0 18px 38px rgba(6, 4, 10, 0.34),
    inset 0 1px 0 rgba(255, 255, 255, 0.58);
}

.ending-portrait__frame img {
  border-radius: 18px;
}

.ending-copy {
  position: absolute;
  left: 8%;
  right: auto;
  bottom: 8%;
  z-index: 2;
  width: min(100%, 25rem);
  display: grid;
  gap: 0.8rem;
  text-align: left;
  opacity: 0;
  pointer-events: none;
  transform: translateY(1.5rem);
  transition: opacity 1.7s var(--ease-gentle), transform 1.7s var(--ease-gentle);
}

.ending-page.is-lit .ending-copy {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.ending-copy .ending-title__cn,
.ending-copy .ending-title__en,
.ending-copy .body-copy,
.ending-copy .caption-en {
  color: rgba(255, 244, 236, 0.95);
}

.ending-copy .caption-en,
.ending-copy .ending-title__en {
  color: rgba(255, 226, 214, 0.78);
}

.ending-copy .body-copy {
  text-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.ending-copy .soft-button {
  background: linear-gradient(135deg, #f1c5c7, #d6979a);
  color: #40282a;
  box-shadow: 0 16px 30px rgba(10, 5, 14, 0.24);
}

.ending-copy .page-actions {
  justify-content: flex-start;
}
}

.book-footer__hint {
  display: grid;
  gap: 0.08rem;
  color: rgba(95, 75, 70, 0.68);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.book-footer__hint strong {
  color: var(--ink-900);
  font-size: 0.82rem;
}

.page-indicator {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: rgba(255, 250, 244, 0.7);
  border: 1px solid rgba(191, 156, 138, 0.22);
  color: var(--ink-900);
  box-shadow: 0 10px 26px rgba(110, 82, 72, 0.1);
}

.page-indicator span {
  font-family: var(--serif);
  font-size: 1.2rem;
}

.page-indicator__divider {
  color: rgba(95, 75, 70, 0.48);
}

.book-controls {
  display: flex;
  gap: 0.85rem;
}

.nav-button {
  min-width: 8rem;
  min-height: 3.3rem;
  padding: 0.8rem 1.2rem;
  border-radius: 999px;
  background: rgba(255, 250, 244, 0.76);
  border: 1px solid rgba(191, 156, 138, 0.3);
  box-shadow: 0 12px 30px rgba(110, 82, 72, 0.1);
  display: inline-grid;
  justify-items: center;
}

.nav-button__cn {
  font-weight: 700;
  color: var(--ink-900);
}

.nav-button__en {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(95, 75, 70, 0.72);
}

.nav-button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
  box-shadow: none;
}

@keyframes drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.2;
  }
  50% {
    transform: translate3d(0.4rem, -1rem, 0) scale(1.3);
    opacity: 0.75;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes candlePulse {
  0%,
  100% {
    transform: translateX(-50%) scale(0.96);
    opacity: 0.84;
  }
  50% {
    transform: translateX(-50%) scale(1.08);
    opacity: 1;
  }
}

@media (max-width: 1024px) {
  :root {
    --stage-width: min(980px, calc(100vw - 1.6rem));
    --stage-height: min(700px, calc(100svh - 6.6rem));
  }

  .book-stage {
    padding: 1.1rem;
  }

  .cover-page,
  .album-page {
    grid-template-columns: 1fr;
  }

  .cover-visual,
  .album-visual {
    order: -1;
    min-height: 17rem;
  }

  .cover-copy {
    gap: 1rem;
  }

  .letter-page {
    grid-template-columns: 1fr;
  }

  .letter-aside {
    padding: 0;
  }
}

@media (max-width: 760px) {
  :root {
    --page-radius: 26px;
    --page-padding: 1rem;
    --stage-height: calc(100svh - 10.3rem);
  }

  body {
    overflow: auto;
  }

  .book-app {
    min-height: 100svh;
    justify-content: flex-start;
    padding: 0.8rem;
    gap: 0.8rem;
  }

  .book-chrome,
  .book-footer {
    width: min(100%, calc(100vw - 1.6rem));
  }

  .book-chrome {
    align-items: flex-start;
    flex-direction: column;
  }

  .book-stage {
    min-height: 0;
    height: auto;
    padding: 0.85rem;
  }

  .page-window {
    min-height: calc(100svh - 16.6rem);
  }

  .page {
    min-height: calc(100svh - 18.2rem);
    transform: translateX(8%) rotateY(10deg) scale(0.99);
  }

  .page.is-prev {
    transform: translateX(-5%) rotateY(-8deg) scale(0.99);
  }

  .page.is-next {
    transform: translateX(7%) rotateY(12deg) scale(0.99);
  }

  .display-cn {
    font-size: clamp(2.3rem, 12vw, 3.4rem);
  }

  .photo-spread__head {
    display: grid;
    gap: 0.6rem;
  }

  .photo-spread__layout,
  .photo-spread__layout--duet,
  .photo-spread__layout--duet-alt,
  .photo-spread__layout--trio-feature,
  .photo-spread__layout--trio-postcards,
  .photo-spread__layout--quartet-grid,
  .photo-spread__layout--quartet-postcards,
  .photo-spread__layout--solo-center {
    grid-template-columns: 1fr;
    grid-template-rows: none;
  }

  .photo-spread__layout--trio-feature .photo-card:first-child,
  .photo-spread__layout--quartet-postcards .photo-card:first-child {
    grid-row: auto;
  }

  .photo-spread__layout--solo-center .photo-card {
    width: 100%;
  }

  .photo-spread__quote,
  .photo-spread__quote--duet,
  .photo-spread__quote--duet-alt,
  .photo-spread__quote--trio-feature,
  .photo-spread__quote--trio-postcards,
  .photo-spread__quote--quartet-grid,
  .photo-spread__quote--quartet-postcards,
  .photo-spread__quote--solo-center {
    position: relative;
    left: auto;
    right: auto;
    top: auto;
    bottom: auto;
    width: min(100%, 16rem);
    min-height: auto;
    justify-self: center;
    margin-top: 0.15rem;
    transform: rotate(-2deg);
  }

  .photo-card {
    gap: 0.6rem;
  }

  .photo-card__frame {
    aspect-ratio: 1.05;
  }

  .ending-shell {
    min-height: calc(100svh - 20rem);
  }

  .ending-scene {
    place-items: center;
    gap: 1rem;
    padding: 1.35rem 1rem 1.5rem;
  }

  .ending-page .page-kicker {
    position: relative;
    top: auto;
    left: auto;
    justify-self: flex-start;
  }

  .ending-cake-button {
    width: min(100%, 15.5rem);
  }

  .ending-portrait,
  .ending-copy {
    width: min(calc(100% - 2rem), 20rem);
    text-align: center;
  }

  .ending-portrait {
    right: 50%;
    bottom: 22%;
    transform: translate(50%, 1rem) rotate(0deg);
  }

  .ending-page.is-lit .ending-portrait {
    transform: translate(50%, 0) rotate(0deg);
  }

  .ending-copy {
    left: 50%;
    bottom: 4%;
    transform: translate(-50%, 1.5rem);
  }

  .ending-page.is-lit .ending-copy {
    transform: translate(-50%, 0);
  }

  .ending-copy .page-actions {
    justify-content: center;
  }

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

  .book-controls {
    width: 100%;
  }

  .nav-button {
    flex: 1;
    min-width: 0;
  }
}

@media (max-width: 520px) {
  .book-mark {
    font-size: 0.68rem;
  }

  .music-toggle {
    width: 100%;
    justify-content: center;
  }

  .cover-frame {
    width: min(100%, 320px);
  }

  .cover-frame__seal {
    width: 4.3rem;
    font-size: 0.68rem;
  }

  .album-board {
    padding: 0.9rem;
  }

  .album-board__grid {
    gap: 0.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}