@font-face {
  font-family: "Ota Serif";
  src: url("./assets/noto-serif-sc-subset.ttf") format("truetype");
  font-weight: 500;
  font-display: swap;
}
:root {
  color-scheme: light dark;
  --paper: #faf9f6;
  --ink: #232622;
  --muted: #676a66;
  --rule: #dedfd9;
  --blue: #1558d6;
  --blue-hover: #114bb7;
  --sky: #eaf0f7;
  --rose: #f2e4e4;
  --white: #fff;
  --stage: #eaf0f7;
  --soft: #f0f1ec;
  --disabled: #e5e6e0;
  --shadow: 0 22px 40px -16px rgba(30, 42, 57, 0.27);
  --serif: "Ota Serif", "Songti SC", "Noto Serif CJK SC", serif;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
::selection {
  background: var(--rose);
  color: var(--ink);
}
* {
  scrollbar-color: var(--muted) var(--paper);
}
a {
  color: inherit;
  text-underline-offset: 5px;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
button {
  font: inherit;
}
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 6px;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
button {
  cursor: pointer;
}
h1,
h2,
h3,
p,
figure {
  margin: 0;
}
h1,
h2 {
  font-family: var(--serif);
  font-weight: 500;
  text-wrap: balance;
  letter-spacing: -0.025em;
  line-height: 1.4;
}
h2 {
  font-size: clamp(30px, 3.4vw, 44px);
}
h3 {
  font-size: 19px;
  line-height: 1.5;
  font-weight: 650;
}
p {
  color: var(--muted);
}
.container {
  width: min(1240px, calc(100% - 96px));
  margin-inline: auto;
}
.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  transform: translateY(-150%);
  z-index: 100;
  padding: 10px 20px;
  background: var(--blue);
  color: #fff;
}
.skip-link:focus {
  transform: none;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  height: 88px;
}
.brand {
  display: inline-flex;
  gap: 11px;
  align-items: center;
  text-decoration: none;
  white-space: nowrap;
}
.brand img {
  border-radius: 10px;
}
.brand span {
  font-size: 25px;
  font-weight: 750;
  letter-spacing: -0.04em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  margin-left: auto;
  margin-right: 24px;
}
.nav-links a {
  text-decoration: none;
  font-size: 14px;
}
.nav-links a:hover,
.footer a:hover {
  color: var(--blue);
}
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  min-height: 52px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: var(--blue);
  color: #fff;
  text-decoration: none;
  padding: 12px 25px;
  font-size: 15px;
  font-weight: 600;
  transition:
    background 0.2s,
    transform 0.2s;
}
.button:hover {
  background: var(--blue-hover);
  transform: translateY(-2px);
}
.button-small {
  min-height: 42px;
  padding: 8px 20px;
  font-size: 14px;
}
.text-link {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  color: var(--blue);
  text-decoration: none;
  font-size: 15px;
  font-weight: 550;
  min-height: 44px;
}
.text-link:hover {
  text-decoration: underline;
}
.text-link span {
  font-family: Arial, sans-serif;
  font-size: 20px;
}
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  min-height: 690px;
  gap: 20px;
  padding-block: 48px 54px;
}
.hero-copy {
  position: relative;
  z-index: 2;
  min-width: 0;
}
.hero h1 {
  font-size: clamp(34px, 3.6vw, 50px);
  line-height: 1.55;
  white-space: nowrap;
}
.hero h1 span {
  color: var(--blue);
}
.hero-description {
  font-size: 17px;
  line-height: 1.9;
  margin-top: 26px;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 27px;
  margin-top: 32px;
}
.hero-platforms {
  font-size: 12px;
  margin-top: 23px;
  display: flex;
  gap: 11px;
  align-items: center;
}
.hero-art {
  position: relative;
  height: 568px;
  isolation: isolate;
}
.paper-circle {
  position: absolute;
  width: 530px;
  height: 530px;
  max-width: 100%;
  border-radius: 50%;
  background: var(--sky);
  top: 20px;
  left: 2%;
  z-index: -1;
}
.device {
  display: block;
  background: #24282b;
  padding: 5px;
  border-radius: 32px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.device img {
  width: 100%;
  border-radius: 27px;
  aspect-ratio: 1320/2868;
  object-fit: contain;
  background: #eef3f8;
}
.hero-home {
  position: absolute;
  width: 238px;
  left: 4%;
  top: 4px;
  transform: rotate(-6deg);
}
.hero-cheki {
  position: absolute;
  width: 244px;
  right: 3%;
  top: 50px;
  transform: rotate(6deg);
}
.keepsake {
  position: absolute;
  bottom: 0;
  left: 4%;
  transform: rotate(-7deg);
  z-index: 3;
  background: #fffdf9;
  color: #353831;
  display: flex;
  align-items: center;
  box-shadow: 0 10px 20px -10px #56554d66;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.65;
}
.keepsake > span:last-child {
  padding: 12px 20px;
}
.ticket-stub {
  align-self: stretch;
  display: flex;
  align-items: center;
  justify-content: center;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font:
    11px Georgia,
    serif;
  letter-spacing: 0.12em;
  background: #dce7f7;
  padding: 12px;
  border-left: 1px dashed #a1acbc;
}
.hero-foot {
  border-top: 1px solid var(--rule);
  padding-block: 23px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}
.hero-foot p {
  font-size: 15px;
  color: var(--ink);
}
.hero-foot > span {
  font-size: 11px;
  color: var(--muted);
}
.chapter {
  padding-block: 125px;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 100px;
  align-items: center;
}
.section-intro {
  font-size: 16px;
  line-height: 1.9;
  margin-top: 22px;
  max-width: 640px;
}
.chapters {
  margin-top: 38px;
}
.chapter-choice {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--ink);
  border: 0;
  border-top: 1px solid var(--rule);
  padding: 23px 0;
  display: block;
}
.chapter-choice:last-child {
  border-bottom: 1px solid var(--rule);
}
.chapter-moment {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 6px;
}
.chapter-title {
  font-size: 21px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.choice-mark {
  font-size: 24px;
  font-weight: 400;
  opacity: 0;
}
.chapter-description {
  display: block;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  margin-top: 11px;
  max-width: 400px;
}
.chapter-choice[aria-pressed="true"] .chapter-title {
  color: var(--blue);
}
.chapter-choice[aria-pressed="true"] .choice-mark,
.chapter-choice:hover .choice-mark {
  opacity: 1;
}
.chapter-choice[aria-pressed="true"] {
  border-top-color: var(--blue);
}
.scene-stage {
  background: var(--stage);
  padding: 36px 32px 27px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  flex-direction: column;
  transition: background 0.3s;
}
.scene-stage[data-scene="cheki"] {
  background: var(--rose);
}
.scene-stage[data-scene="cheki"] figcaption {
  color: var(--ink);
}
.scene-device {
  width: 264px;
}
.scene-stage figcaption {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
  margin-top: 22px;
}
.image-hint {
  display: block;
  font-size: 11px;
  margin-top: 5px;
}
.collection {
  padding-block: 98px 66px;
  background: var(--soft);
}
.section-heading {
  text-align: center;
}
.section-heading p {
  margin-inline: auto;
}
.screen-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 65px;
  margin-top: 64px;
}
.screen-gallery figure {
  text-align: center;
  min-width: 0;
}
.gallery-device {
  width: 258px;
  margin-inline: auto;
  transition: transform 0.25s;
}
.gallery-device:hover {
  transform: translateY(-6px);
}
.screen-gallery figure:nth-child(2) {
  padding-top: 48px;
}
.screen-gallery figcaption {
  margin-top: 25px;
}
.screen-gallery figcaption p {
  font-size: 13px;
  margin-top: 8px;
}
.screenshot-note {
  font-size: 11px;
  text-align: center;
  margin-top: 44px;
}
.little-things {
  padding-block: 100px;
}
.little-things h2 {
  font-size: 34px;
}
.utility-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin-top: 35px;
  border-top: 1px solid var(--rule);
  padding-top: 30px;
}
.utility-list p {
  font-size: 14px;
  margin-top: 12px;
}
.privacy-section {
  background: var(--sky);
  padding-block: 86px;
}
.privacy-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 100px;
  align-items: center;
}
.privacy-inner p {
  margin-top: 24px;
  line-height: 1.9;
  font-size: 15px;
}
.privacy-inner .text-link {
  margin-top: 18px;
}
.privacy-facts {
  margin: 0;
}
.privacy-facts > div {
  padding: 21px 0;
  border-bottom: 1px solid var(--rule);
}
.privacy-facts > div:first-child {
  padding-top: 0;
}
.privacy-facts > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.privacy-facts dt {
  font-weight: 650;
  font-size: 18px;
}
.privacy-facts dd {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.questions {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  padding-block: 105px;
}
.questions h2 {
  font-size: 32px;
  max-width: 300px;
}
.faq-list {
  border-top: 1px solid var(--rule);
}
details {
  border-bottom: 1px solid var(--rule);
}
summary {
  cursor: pointer;
  list-style: none;
  padding: 21px 32px 21px 0;
  font-size: 16px;
  font-weight: 550;
  position: relative;
}
summary::-webkit-details-marker {
  display: none;
}
summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  font-size: 23px;
  top: 15px;
  font-weight: 400;
}
details[open] summary::after {
  content: "−";
}
details p {
  font-size: 14px;
  padding: 0 26px 23px 0;
  line-height: 1.85;
}
details a {
  color: var(--blue);
}
.download-section {
  background: var(--sky);
  padding-block: 80px 68px;
  text-align: center;
}
.download-icon {
  margin: 0 auto 24px;
  border-radius: 16px;
}
.download-inner > p {
  margin-top: 18px;
  font-size: 16px;
}
.download-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 30px;
}
.download-actions .button {
  min-width: 240px;
  flex-direction: column;
  gap: 2px;
  padding: 14px 24px;
  font-size: 16px;
}
.button-detail {
  font-size: 11px;
  font-weight: 400;
  opacity: 0.88;
}
.button-outline {
  background: transparent;
  border-color: var(--blue);
  color: var(--blue);
}
.button-outline:hover {
  background: var(--paper);
}
.button[aria-disabled="true"] {
  background: var(--disabled);
  color: var(--muted);
  border-color: var(--rule);
  cursor: not-allowed;
  transform: none;
}
.download-inner .download-note {
  font-size: 12px;
  max-width: 680px;
  margin: 22px auto 0;
}
.footer {
  padding-block: 44px 26px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}
.footer .brand span {
  font-size: 21px;
}
.footer p {
  font-size: 12px;
  margin-top: 8px;
}
.footer-links {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 28px;
  font-size: 13px;
}
.footer-links a {
  text-decoration: none;
}
.footer-legal {
  grid-column: 1/-1;
  border-top: 1px solid var(--rule);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 11px;
  color: var(--muted);
}
.footer-legal a {
  text-decoration: none;
}
@keyframes settle {
  from {
    translate: 0 18px;
    filter: blur(2px);
  }
  to {
    translate: 0 0;
    filter: blur(0);
  }
}
@media (prefers-reduced-motion: no-preference) {
  .hero-art {
    animation: settle 0.9s cubic-bezier(0.16, 1, 0.3, 1) both;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}
@media (min-width: 1500px) {
  .hero {
    min-height: 750px;
  }
  .hero-art {
    height: 610px;
  }
  .hero-home {
    width: 260px;
  }
  .hero-cheki {
    width: 268px;
  }
  .paper-circle {
    width: 570px;
    height: 570px;
  }
  .keepsake {
    bottom: -6px;
  }
}
@media (max-width: 1100px) {
  .container {
    width: calc(100% - 64px);
  }
  .hero h1 {
    font-size: 3.7vw;
  }
  .hero {
    min-height: 610px;
  }
  .hero-art {
    height: 500px;
  }
  .hero-home {
    width: 205px;
    left: 0;
  }
  .hero-cheki {
    width: 212px;
    right: 0;
  }
  .paper-circle {
    width: 430px;
    height: 430px;
  }
  .keepsake {
    font-size: 17px;
    left: 0;
  }
  .chapter {
    gap: 55px;
    padding-block: 90px;
  }
  .screen-gallery {
    gap: 30px;
  }
  .gallery-device {
    width: 230px;
  }
  .privacy-inner {
    gap: 55px;
  }
  .questions {
    gap: 48px;
  }
  .hero-description {
    font-size: 15px;
  }
  .nav-links {
    gap: 22px;
    margin-right: 0;
  }
}
@media (max-width: 820px) {
  .container {
    width: calc(100% - 48px);
  }
  .nav {
    height: 72px;
    gap: 16px;
  }
  .nav-links {
    gap: 18px;
  }
  .nav-links a {
    font-size: 12px;
  }
  .brand span {
    font-size: 22px;
  }
  .brand img {
    width: 34px;
    height: 34px;
  }
  .hero {
    grid-template-columns: minmax(0, 1fr);
    text-align: center;
    padding-block: 45px 28px;
    gap: 36px;
  }
  .hero h1 {
    font-size: clamp(30px, 5.8vw, 46px);
    white-space: normal;
  }
  .hero-description {
    font-size: 16px;
    margin-top: 20px;
  }
  .hero-actions,
  .hero-platforms {
    justify-content: center;
  }
  .hero-art {
    width: 500px;
    max-width: 100%;
    margin-inline: auto;
    height: 570px;
  }
  .hero-home {
    width: 238px;
    left: 3%;
  }
  .hero-cheki {
    width: 244px;
    right: 3%;
  }
  .paper-circle {
    width: 490px;
    height: 490px;
    left: 1%;
  }
  .keepsake {
    left: 8%;
    font-size: 20px;
  }
  .hero-foot {
    padding-block: 20px;
  }
  .chapter {
    gap: 35px;
  }
  .chapter h2 {
    font-size: 30px;
  }
  .chapter-title {
    font-size: 17px;
  }
  .chapter-description {
    font-size: 13px;
  }
  .chapter-choice {
    padding-block: 18px;
  }
  .scene-stage {
    padding: 25px 18px;
  }
  .scene-device {
    width: 235px;
  }
  .collection {
    padding-top: 70px;
  }
  .screen-gallery {
    gap: 23px;
  }
  .gallery-device {
    border-radius: 25px;
    padding: 4px;
  }
  .gallery-device img {
    border-radius: 21px;
  }
  .screen-gallery figcaption h3 {
    font-size: 16px;
  }
  .screen-gallery figcaption p {
    font-size: 12px;
  }
  .utility-list {
    gap: 25px;
  }
  .utility-list h3 {
    font-size: 16px;
  }
  .privacy-inner {
    gap: 40px;
  }
  .privacy-inner h2 {
    font-size: 32px;
  }
  .questions {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-block: 80px;
  }
  .questions h2 {
    max-width: none;
  }
  .footer-links {
    gap: 20px;
  }
}
@media (max-width: 600px) {
  html {
    scroll-padding-top: 86px;
  }
  .container {
    width: calc(100% - 40px);
  }
  .nav {
    height: 68px;
  }
  .nav-links {
    display: none;
  }
  .button-small {
    min-height: 40px;
    padding-inline: 16px;
    font-size: 12px;
  }
  .hero {
    padding-top: 38px;
    gap: 30px;
  }
  .hero h1 {
    font-size: clamp(28px, 7.6vw, 40px);
    line-height: 1.6;
  }
  .hero-description {
    font-size: 14px;
    line-height: 1.9;
    margin-top: 18px;
  }
  .hero-actions {
    gap: 20px;
    margin-top: 23px;
  }
  .hero-actions .button {
    font-size: 14px;
    padding: 11px 20px;
    min-height: 48px;
  }
  .hero-actions .text-link {
    font-size: 13px;
    gap: 5px;
  }
  .hero-platforms {
    font-size: 10px;
    gap: 8px;
    margin-top: 16px;
  }
  .hero-art {
    width: 100%;
    max-width: 340px;
    height: auto;
    aspect-ratio: 340/408;
  }
  .hero-home {
    width: 47%;
    left: 2%;
    top: 0;
  }
  .hero-cheki {
    width: 48%;
    right: 2%;
    top: 35px;
  }
  .hero-art .device {
    padding: 4px;
    border-radius: 25px;
  }
  .hero-art .device img {
    border-radius: 21px;
  }
  .paper-circle {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
    top: 8px;
  }
  .keepsake {
    bottom: 0;
    left: 8%;
    font-size: 16px;
  }
  .keepsake > span:last-child {
    padding: 8px 13px;
  }
  .ticket-stub {
    font-size: 9px;
    padding: 9px;
  }
  .hero-foot {
    flex-direction: column;
    gap: 5px;
    text-align: center;
  }
  .hero-foot p {
    font-size: 13px;
  }
  .hero-foot > span {
    font-size: 10px;
  }
  .chapter {
    display: flex;
    flex-direction: column;
    gap: 30px;
    padding-block: 65px;
  }
  .chapter-copy {
    width: 100%;
  }
  h2,
  .chapter h2 {
    font-size: 30px;
  }
  .section-intro {
    font-size: 14px;
    margin-top: 17px;
  }
  .chapters {
    margin-top: 28px;
  }
  .chapter-choice {
    padding-block: 20px;
  }
  .chapter-title {
    font-size: 19px;
  }
  .chapter-moment {
    font-size: 11px;
  }
  .chapter-description {
    font-size: 14px;
  }
  .scene-stage {
    width: 100%;
    padding: 30px 24px 23px;
  }
  .scene-device {
    width: 244px;
  }
  .collection {
    padding-block: 60px 35px;
  }
  .section-heading {
    text-align: left;
  }
  .screen-gallery {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 28px;
    margin: 30px -20px 0;
    padding: 10px 32px 24px;
    scroll-padding-left: 32px;
  }
  .screen-gallery figure {
    flex: 0 0 258px;
    scroll-snap-align: start;
  }
  .screen-gallery figure:nth-child(2) {
    padding-top: 0;
  }
  .gallery-device {
    width: 236px;
  }
  .screen-gallery figcaption h3 {
    font-size: 18px;
  }
  .screen-gallery figcaption p {
    font-size: 13px;
  }
  .screenshot-note {
    text-align: left;
    font-size: 11px;
    margin-top: 19px;
  }
  .little-things {
    padding-block: 60px;
  }
  .little-things h2 {
    font-size: 29px;
  }
  .utility-list {
    grid-template-columns: 1fr;
    gap: 25px;
    margin-top: 24px;
    padding-top: 24px;
  }
  .utility-list h3 {
    font-size: 18px;
  }
  .utility-list p {
    margin-top: 6px;
  }
  .privacy-section {
    padding-block: 60px;
  }
  .privacy-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .privacy-inner h2 {
    font-size: 32px;
  }
  .privacy-facts > div {
    padding-block: 18px;
  }
  .questions {
    padding-block: 60px;
    gap: 25px;
  }
  .questions h2 {
    font-size: 29px;
  }
  .download-section {
    padding-block: 60px 48px;
  }
  .download-inner h2 {
    font-size: 29px;
  }
  .download-inner > p {
    font-size: 14px;
  }
  .download-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    max-width: 320px;
    margin-inline: auto;
  }
  .download-actions .button {
    font-size: 15px;
  }
  .download-inner .download-note {
    font-size: 11px;
  }
  .footer {
    grid-template-columns: 1fr;
    gap: 23px;
    padding-block: 32px 24px;
  }
  .footer-links {
    justify-content: flex-start;
    font-size: 13px;
    gap: 26px;
  }
  .footer-legal {
    flex-wrap: wrap;
    gap: 5px;
    font-size: 10px;
  }
  .footer-legal span {
    width: 100%;
  }
}
@media (max-width: 370px) {
  .hero-art {
    height: auto;
  }
  .hero h1 {
    font-size: 27px;
  }
  .hero-actions {
    gap: 14px;
  }
  .hero-platforms {
    font-size: 9px;
  }
  .hero-home {
    width: 46%;
  }
  .hero-cheki {
    width: 47%;
  }
  .keepsake {
    font-size: 14px;
  }
  .scene-device {
    width: 220px;
  }
  .chapter-title {
    font-size: 17px;
  }
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #191c20;
    --ink: #f1f0e9;
    --muted: #b2b7be;
    --rule: #3d424b;
    --blue: #95baff;
    --blue-hover: #b3ceff;
    --sky: #242e3c;
    --rose: #3d3039;
    --stage: #242e3c;
    --soft: #20252a;
    --disabled: #343a43;
    --shadow: 0 22px 40px -16px rgba(0, 0, 0, 0.55);
  }
  .button {
    color: #192337;
  }
  .button-outline {
    color: var(--blue);
  }
  .keepsake {
    background: #eee9e0;
    color: #353831;
  }
  .ticket-stub {
    background: #cdd8e9;
  }
  .device {
    background: #4a515b;
  }
  .download-icon,
  .brand img {
    background: #fff;
  }
  .skip-link {
    color: #192337;
  }
}