:root {
  --paper: #faf7ef;
  --cream: #f2efe4;
  --ink: #2e493f;
  --muted: #697569;
  --green: #5d7757;
  --line: #dcded0;
  --white: #fffcf4;
  --heading: Georgia, "Batang", "바탕", serif;
  color-scheme: light;
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  word-break: keep-all;
}
a {
  color: inherit;
  text-underline-offset: 5px;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}
button:disabled {
  cursor: default;
}
img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid #bd7359;
  outline-offset: 5px;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1,
h2 {
  font-family: var(--heading);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.055em;
}
h1 {
  font-size: clamp(36px, 4.4vw, 62px);
  margin-bottom: 20px;
}
h2 {
  font-size: clamp(32px, 4vw, 54px);
  margin-bottom: 26px;
}
h3 {
  font-weight: 500;
}
p {
  margin-bottom: 18px;
}
.skip-link {
  position: fixed;
  top: -80px;
  left: 20px;
  padding: 12px;
  background: var(--white);
  z-index: 20;
}
.skip-link:focus {
  top: 12px;
}
.site-header {
  height: 94px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  position: relative;
  z-index: 5;
}
.brand {
  font:
    500 25px/1.3 Georgia,
    serif;
  letter-spacing: 0.08em;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand img {
  width: 31px;
}
.site-header nav {
  display: flex;
  gap: 32px;
  font-size: 13px;
}
.site-header nav a {
  text-decoration: none;
  padding: 10px 0;
}
.site-header nav a:hover,
.site-footer nav a:hover {
  color: var(--green);
  text-decoration: underline;
}
.menu-toggle {
  display: none;
}
.eyebrow {
  font-size: 11px;
  letter-spacing: 0.22em;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 26px;
}
.lead {
  color: var(--muted);
  line-height: 1.9;
  font-size: 17px;
  letter-spacing: -0.03em;
}
.chapter {
  position: relative;
  min-height: 90svh;
  padding: 110px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  scroll-margin-top: 0;
  overflow: clip;
}
.chapter-inner {
  width: min(100%, 1060px);
}
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 100px;
}
.hero {
  min-height: calc(100svh - 94px);
  padding: 28px 24px 60px;
  gap: 28px;
}
.hero-copy {
  text-align: center;
}
.hero-copy .eyebrow {
  margin-bottom: 18px;
}
.hero-copy h1 {
  margin-bottom: 12px;
}
.hero-copy .lead {
  font-size: 15px;
  margin-bottom: 20px;
}
.button,
.pill,
.action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 12px 26px;
  border-radius: 999px;
  background: var(--green);
  color: var(--white);
  border: 1px solid var(--green);
  font-size: 14px;
  line-height: 1.6;
  text-decoration: none;
  min-height: 48px;
  transition:
    background 0.2s,
    transform 0.2s;
}
.button:hover,
.action:hover {
  background: #435e43;
  transform: translateY(-2px);
}
.pill {
  background: transparent;
  border-color: var(--line);
  color: var(--muted);
}
.download-slot small {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-top: 8px;
}
.hero-art {
  width: 285px;
  padding: 18px;
}
.board-art {
  position: relative;
  width: 100%;
  isolation: isolate;
}
.board-art:not(.skin) {
  padding: 18px;
  border: 1px solid #c6ccba;
  border-radius: 18px;
  background: #fffcf2;
  box-shadow:
    0 5px 0 #e2dbc8,
    0 16px 42px #394a3210;
}
.puzzle-grid {
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 2px;
  overflow: hidden;
  border-radius: 5px;
  background: #f7f2e7;
  position: relative;
  z-index: 2;
}
.cell {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
}
.cell img {
  width: 83%;
  height: 83%;
  object-fit: contain;
}
.cell .x {
  width: 37%;
  height: 37%;
  position: relative;
}
.x::before,
.x::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 2px;
  top: calc(50% - 1px);
  left: 0;
  background: #7c8175;
  border-radius: 2px;
  transform: rotate(45deg);
}
.x::after {
  transform: rotate(-45deg);
}
.r0 {
  background: #dce6cb;
}
.r1 {
  background: #cde0e5;
}
.r2 {
  background: #f0e4c8;
}
.r3 {
  background: #e6ded0;
}
.r4 {
  background: #e4dce9;
}
.r5 {
  background: #d7e5db;
}
.board-leaves {
  position: absolute;
  z-index: 3;
  width: 58%;
  right: -31%;
  bottom: -9%;
  pointer-events: none;
  transform: rotate(-20deg);
}
.hero .board-leaves {
  width: 76%;
  right: -52%;
  bottom: -9%;
  transform: rotate(-20deg);
}
.scroll-cue {
  display: flex;
  flex-direction: column;
  text-align: center;
  gap: 2px;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-decoration: none;
  margin-top: 12px;
}
.scroll-cue span {
  font-size: 20px;
  color: var(--ink);
}
.rule-chapter {
  background: #f0f2e9;
}
.section-copy {
  position: relative;
  z-index: 2;
}
.section-copy .lead {
  margin-bottom: 40px;
}
.rule-list {
  padding: 0;
  margin: 0;
  list-style: none;
  display: grid;
  gap: 23px;
}
.rule-list li {
  display: flex;
  align-items: flex-start;
  gap: 21px;
}
.rule-list li > span {
  font:
    italic 18px/1.8 Georgia,
    serif;
  color: #8c9b81;
  min-width: 24px;
}
.rule-list h3 {
  font-size: 18px;
  margin: 0 0 5px;
}
.rule-list p {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}
.rule-art {
  width: 100%;
  max-width: 400px;
  justify-self: center;
}
.rule-art .board-art {
  transform: rotate(2deg);
}
.art-caption {
  font-size: 12px;
  line-height: 1.8;
  color: var(--muted);
  text-align: center;
  margin: 30px 0 0;
}
.art-caption span {
  font-size: 10px;
}
.collection-chapter {
  padding-top: 100px;
  padding-bottom: 100px;
}
.centered {
  text-align: center;
}
.collection-chapter .lead {
  margin-bottom: 14px;
}
.collection-preview {
  width: min(100%, 370px);
}
.skin {
  aspect-ratio: 1190/1380;
}
.board-skin {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.skin .puzzle-grid {
  position: absolute;
  left: 7.9832%;
  top: 13.7681%;
  width: 84.0336%;
}
.collection-controls {
  text-align: center;
  margin-top: 20px;
}
.selectors {
  display: flex;
  justify-content: center;
  gap: 14px;
}
.stamp-option {
  width: 66px;
  height: 66px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 50%;
  padding: 9px;
  transition:
    background 0.2s,
    transform 0.2s,
    border-color 0.2s;
}
.stamp-option:hover {
  transform: translateY(-3px);
  background: #f0eadb;
}
.stamp-option[aria-pressed="true"] {
  border-color: var(--green);
  background: #f0f1e6;
}
.board-options {
  gap: 22px;
  margin-top: 20px;
}
.board-options button {
  font-size: 13px;
  padding: 6px 0;
  border: 0;
  border-bottom: 1px solid transparent;
  background: transparent;
  color: var(--muted);
}
.board-options button[aria-pressed="true"] {
  border-bottom-color: var(--ink);
  color: var(--ink);
}
.collection-controls .art-caption {
  margin-top: 20px;
}
.subtle {
  font-size: 11px;
  color: var(--muted);
}
.collection-controls .subtle {
  margin-top: 8px;
}
.journey-chapter {
  background: #f1efe6;
}
.journey-list {
  display: grid;
  gap: 38px;
}
.journey-list article {
  display: flex;
  gap: 24px;
  border-bottom: 1px solid #d6dacf;
  padding-bottom: 30px;
}
.journey-list article:last-child {
  border: 0;
  padding-bottom: 0;
}
.journey-number {
  font:
    italic 25px Georgia,
    serif;
  color: #98a18d;
}
.journey-list h3 {
  font-family: var(--heading);
  font-size: 25px;
  margin: 0 0 14px;
  letter-spacing: -0.035em;
}
.journey-list p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
  line-height: 1.9;
}
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 28px;
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid #a6b29e;
  padding: 8px 0;
}
.text-link:hover {
  color: var(--green);
}
.closing {
  text-align: center;
  padding: 130px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
}
.closing h2 {
  font-size: clamp(26px, 3vw, 36px);
  margin: 0;
}
.closing .text-link {
  margin-top: 15px;
  font-size: 12px;
}
.site-footer {
  border-top: 1px solid var(--line);
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 40px 26px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
}
.site-footer .brand {
  font-size: 23px;
}
.site-footer p {
  font-size: 12px;
  color: var(--muted);
  margin-top: 12px;
}
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 20px;
  font-size: 12px;
  padding-top: 8px;
}
.site-footer nav a {
  text-decoration: none;
}
.site-footer small {
  grid-column: 1/-1;
  font-size: 10px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 20px;
}
.js-reveal .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.7s ease,
    transform 0.7s cubic-bezier(0.2, 0.65, 0.3, 1);
}
.js-reveal .reveal.is-visible {
  opacity: 1;
  transform: none;
}
.document {
  width: min(100% - 48px, 780px);
  margin: 74px auto 120px;
  min-height: 45svh;
  overflow-wrap: anywhere;
}
.document h1 {
  font-size: clamp(30px, 4vw, 44px);
  margin-top: 22px;
  margin-bottom: 22px;
}
.document h2 {
  font-family: inherit;
  font-weight: 600;
  font-size: 20px;
  margin-top: 48px;
  letter-spacing: -0.025em;
}
.document p,
.document li {
  font-size: 15px;
  line-height: 1.95;
}
.document li {
  margin-bottom: 10px;
}
.document ul,
.document ol {
  padding-left: 24px;
}
.document .date {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 40px;
}
.document .back-link {
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
}
.document nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 22px;
  font-size: 13px;
}
.document .notice {
  padding: 22px;
  background: #eeeee1;
  border-left: 3px solid #91a17e;
  border-radius: 0 10px 10px 0;
}
.document .subtle {
  font-size: 12px;
}
.document section {
  scroll-margin-top: 30px;
}
.document #en {
  margin-top: 70px;
  border-top: 1px solid var(--line);
  padding-top: 15px;
}
.document .action {
  font-size: 14px;
}
.mail {
  font-weight: 500;
  font-size: 18px;
  overflow-wrap: anywhere;
}
.support h1,
.notices h1 {
  margin-top: 0;
}
.faq {
  margin-top: 65px;
}
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
.faq summary {
  list-style: none;
  cursor: pointer;
  padding-right: 34px;
  position: relative;
  font-size: 16px;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary:after {
  content: "+";
  position: absolute;
  right: 5px;
  top: -2px;
  color: var(--green);
  font-size: 23px;
}
.faq details[open] summary:after {
  content: "−";
}
.faq details p {
  color: var(--muted);
  margin: 20px 30px 0 0;
  font-size: 14px;
}
.contact {
  margin-top: 85px;
}
.contact .eyebrow {
  margin-bottom: 15px;
}
.contact h2 {
  font-family: var(--heading);
  font-size: 30px;
  font-weight: 500;
  margin: 0 0 24px;
}
.contact p {
  color: var(--muted);
  font-size: 13px;
  margin-top: 20px;
}
.contact .mail {
  text-decoration: none;
  border-bottom: 1px solid #b9c1ad;
  padding-bottom: 7px;
  display: inline-block;
}
.empty-notices {
  text-align: center;
  padding: 80px 0 70px;
  margin-top: 55px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.empty-notices img {
  opacity: 0.8;
}
.empty-notices h2 {
  font-size: 18px;
  font-weight: 500;
  margin: 24px 0 12px;
}
.empty-notices p {
  font-size: 13px;
  color: var(--muted);
}
@media (min-width: 1500px) {
  .hero {
    gap: 34px;
  }
  .hero-art {
    width: 340px;
  }
  .hero-copy h1 {
    font-size: 66px;
  }
}
@media (max-width: 900px) {
  .site-header {
    padding: 0 32px;
  }
  .split {
    gap: 50px;
  }
  .chapter {
    padding-left: 36px;
    padding-right: 36px;
  }
  .hero {
    padding: 24px 24px 50px;
  }
  .site-footer {
    grid-template-columns: 1fr;
  }
  .site-footer nav {
    gap: 18px;
  }
}
@media (max-width: 640px) {
  :root {
    scroll-padding-top: 30px;
  }
  .site-header {
    height: 78px;
    padding: 0 24px;
  }
  .brand {
    font-size: 22px;
    gap: 8px;
  }
  .brand img {
    width: 27px;
  }
  .menu-toggle {
    display: grid;
    gap: 6px;
    place-content: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: 0;
    z-index: 6;
  }
  .menu-toggle span {
    display: block;
    background: var(--ink);
    width: 20px;
    height: 1px;
  }
  .site-header nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 16px;
    right: 16px;
    padding: 24px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: 0 18px 30px #344c3214;
    flex-direction: column;
    gap: 10px;
  }
  .site-header nav.is-open {
    display: flex;
  }
  .site-header nav a {
    padding: 8px;
  }
  .chapter {
    min-height: auto;
    padding: 85px 26px;
  }
  .hero {
    min-height: calc(100svh - 78px);
    padding: 20px 24px 36px;
    gap: 24px;
  }
  .hero-copy h1 {
    font-size: 36px;
    line-height: 1.4;
  }
  .eyebrow {
    font-size: 9px;
    letter-spacing: 0.2em;
  }
  .hero-copy .lead {
    font-size: 13px;
  }
  .hero-art {
    width: min(73vw, 275px);
    padding: 18px;
  }
  .hero .board-leaves {
    width: 59%;
    right: -27%;
    bottom: -11%;
  }
  .scroll-cue {
    margin-top: 9px;
  }
  .split {
    grid-template-columns: 1fr;
    gap: 60px;
  }
  .section-copy h2 {
    font-size: 36px;
  }
  .lead {
    font-size: 14px;
  }
  .section-copy .lead {
    margin-bottom: 30px;
  }
  .rule-list {
    gap: 23px;
  }
  .rule-list h3 {
    font-size: 16px;
  }
  .rule-list p {
    font-size: 12px;
  }
  .rule-art {
    width: 85%;
    max-width: 300px;
  }
  .rule-art .board-leaves {
    right: -18%;
    width: 48%;
    bottom: -7%;
  }
  .board-art:not(.skin) {
    padding: 14px;
    border-radius: 14px;
  }
  .collection-preview {
    width: min(100%, 320px);
  }
  .collection-controls {
    margin-top: 8px;
    width: 100%;
  }
  .stamp-option {
    width: 58px;
    height: 58px;
    padding: 8px;
  }
  .selectors {
    gap: 10px;
  }
  .board-options {
    gap: 24px;
  }
  .collection-controls .subtle {
    font-size: 10px;
  }
  .journey-list {
    gap: 30px;
  }
  .journey-list h3 {
    font-size: 23px;
  }
  .journey-list p {
    font-size: 13px;
  }
  .journey-number {
    font-size: 22px;
  }
  .closing {
    padding: 90px 24px;
    gap: 24px;
  }
  .closing h2 {
    max-width: 250px;
    line-height: 1.5;
  }
  .site-footer {
    padding: 40px 26px 25px;
    gap: 18px;
  }
  .site-footer nav {
    max-width: 310px;
    gap: 15px 22px;
    font-size: 11px;
  }
  .site-footer small {
    display: grid;
    gap: 5px;
    padding-top: 18px;
  }
  .document {
    width: calc(100% - 48px);
    margin: 45px auto 75px;
  }
  .document h1 {
    font-size: 32px;
    line-height: 1.45;
  }
  .document p,
  .document li {
    font-size: 14px;
  }
  .document h2 {
    font-size: 18px;
    margin-top: 35px;
  }
  .document .date {
    font-size: 11px;
  }
  .document .notice {
    padding: 18px;
  }
  .document .action {
    width: 100%;
    padding: 13px 16px;
  }
  .faq {
    margin-top: 44px;
  }
  .faq summary {
    font-size: 14px;
  }
  .contact .mail {
    font-size: 16px;
  }
  .document .lead {
    font-size: 14px;
  }
  .empty-notices {
    padding: 60px 0;
    margin-top: 36px;
  }
  .empty-notices h2 {
    font-size: 17px;
  }
  .rule-art .art-caption {
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  :root {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
  .js-reveal .reveal {
    opacity: 1;
    transform: none;
  }
}

/* Keep the content usable before scripts load or with JavaScript disabled. */
html:not(.js-ready) .collection-controls {
  display: none;
}
@media (max-width: 640px) {
  html:not(.js-ready) .site-header {
    height: auto;
    min-height: 78px;
    flex-wrap: wrap;
    padding-top: 22px;
    padding-bottom: 22px;
  }
  html:not(.js-ready) .menu-toggle {
    display: none;
  }
  html:not(.js-ready) .site-header nav {
    display: flex;
    position: static;
    box-shadow: none;
    border: 0;
    border-radius: 0;
    padding: 0;
    background: transparent;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px 14px;
    font-size: 12px;
    width: 100%;
  }
  html:not(.js-ready) .site-header nav a {
    padding: 4px 0;
  }
}
@media (min-width: 641px) and (max-height: 760px) {
  .site-header {
    height: 72px;
  }
  .hero {
    min-height: calc(100svh - 72px);
    padding-top: 12px;
    padding-bottom: 24px;
    gap: 14px;
  }
  .hero-copy h1 {
    font-size: 44px;
    line-height: 1.32;
  }
  .hero-copy .eyebrow {
    margin-bottom: 9px;
  }
  .hero-copy .lead {
    font-size: 13px;
    margin-bottom: 12px;
  }
  .hero-art {
    width: 210px;
    padding: 14px;
  }
  .hero .scroll-cue {
    margin-top: 0;
  }
  .hero .button,
  .hero .pill {
    min-height: 42px;
    padding: 9px 24px;
  }
}

[hidden] {
  display: none !important;
}
.notice-row {
  border-top: 1px solid var(--line);
  padding: 28px 0;
}
.notice-row:last-child {
  border-bottom: 1px solid var(--line);
}
.notice-row time {
  font-size: 12px;
  color: var(--muted);
}
.notice-row h2 {
  margin: 10px 0 0;
  font-size: 21px;
  font-weight: 500;
}
.notice-row a {
  text-decoration: none;
}
.notice-row a:hover {
  text-decoration: underline;
}
.notice-row a::after {
  content: " ↗";
  font-size: 14px;
}
.notice-detail .eyebrow {
  margin-top: 42px;
  margin-bottom: 18px;
}
.notice-detail h1 {
  overflow-wrap: anywhere;
}
#notice-body {
  white-space: pre-wrap;
  line-height: 2;
  overflow-wrap: anywhere;
}
#notice-status:empty {
  display: none;
}
#notice-status {
  font-size: 14px;
  color: var(--muted);
  margin: 40px 0 24px;
}
.notice-more {
  margin: 32px auto 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  border-top: 0;
  border-left: 0;
  border-right: 0;
  border-radius: 0;
}
.notice-more:disabled {
  opacity: 0.6;
}
@media (max-width: 640px) {
  .notice-row h2 {
    font-size: 18px;
  }
  .notice-detail h1 {
    font-size: 29px;
  }
  #notice-body {
    font-size: 14px;
  }
}