:root {
  --paper: #efe9dc;
  --paper-deep: #e4dcca;
  --ink: #22252b;
  --ink-soft: #55564f;
  --jjok: #1b365d;
  --jade: #2e6f40;
  --gold: #a87a22;
  --gold-line: #c28e2e;
  --seal: #a82a1e;
  --rule: rgba(27, 54, 93, .18);
  --gutter: clamp(16px, 4vw, 48px);
  --axis: clamp(72px, 17vw, 210px);
  --display: "Song Myung", "Noto Serif KR", "AppleMyungjo", serif;
  --text: "Gowun Dodum", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='480' height='480'%3E%3Cfilter id='f'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.012 .35' numOctaves='3' seed='8'/%3E%3CfeColorMatrix values='0 0 0 0 .42 0 0 0 0 .36 0 0 0 0 .25 0 0 0 .55 -.2'/%3E%3C/filter%3E%3Crect width='480' height='480' filter='url(%23f)' opacity='.34'/%3E%3C/svg%3E");
  font: 400 1.0625rem/1.85 var(--text);
  word-break: keep-all;
  overflow-wrap: anywhere;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--jjok); text-underline-offset: .2em; text-decoration-thickness: 1px; }
a:hover { color: var(--seal); }
:focus-visible { outline: 3px solid var(--seal); outline-offset: 3px; }
h1, h2, h3 { font-family: var(--display); font-weight: 400; color: var(--jjok); line-height: 1.32; margin: 0; }
p { margin: 0 0 1em; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--jjok); color: #fff; padding: 8px 14px; z-index: 5; }
.skip:focus { left: 8px; }

/* 상단 */
.top {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 6px 24px;
  max-width: 1240px; margin: 0 auto; padding: 18px var(--gutter);
}
.brand { display: inline-flex; align-items: center; gap: 12px; font: 400 1.25rem/1 var(--display); color: var(--jjok); text-decoration: none; }
.brand-icon { width: 36px; height: 36px; border-radius: 8px; flex: none; }
.top nav { display: flex; flex-wrap: wrap; gap: 2px 18px; font-size: .9375rem; }
.top nav a { color: var(--ink); text-decoration: none; padding: 4px 0; }
.top nav a:hover, .top nav a[aria-current] { color: var(--seal); text-decoration: underline; }

/* 첫 화면 */
.hero {
  display: grid; grid-template-columns: minmax(0, 1fr); gap: 36px;
  max-width: 1240px; margin: 0 auto; padding: clamp(20px, 4vw, 56px) var(--gutter) clamp(40px, 6vw, 80px);
}
.hero h1 { font-size: clamp(2.25rem, 7.4vw, 4.75rem); line-height: 1.22; letter-spacing: -.02em; max-width: 12em; }
.hero h1 span { display: block; }
.lede { font-size: clamp(1.0625rem, 1.9vw, 1.3125rem); max-width: 30em; margin: 24px 0 28px; color: var(--ink); }
.stores { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 14px; }
.stores a { display: block; border-radius: 10px; transition: transform .15s ease; }
.stores a:hover { transform: translateY(-2px); }
.stores img { height: 62px; width: auto; }
.small { font-size: .9375rem; color: var(--ink-soft); }
.hero .small { margin: 18px 0 0; max-width: 34em; }
.hero-art { justify-self: center; display: flex; align-items: flex-start; gap: clamp(14px, 3vw, 34px); }
.slip {
  writing-mode: vertical-rl; background: #f8f3e6; color: var(--jjok); border: 1px solid var(--gold-line);
  outline: 1px solid var(--gold-line); outline-offset: 3px;
  font: 400 clamp(1.25rem, 2.4vw, 1.75rem)/1 var(--display); letter-spacing: .28em; padding: 22px 11px 14px; margin-top: 8px;
}
.device {
  margin: 0; background: #16181d; padding: 7px; border-radius: 34px; width: min(68vw, 300px);
  box-shadow: 0 2px 0 rgba(255,255,255,.15) inset, 0 24px 46px -24px rgba(27, 37, 54, .7);
}
.device img { border-radius: 27px; width: 100%; }
.device.device--wide { width: 100%; max-width: 860px; margin-top: 28px; border-radius: 26px; padding: 9px; }
.device--wide img { border-radius: 18px; }

/* 연표 축 */
.chronicle { position: relative; max-width: 1240px; margin: 0 auto; padding: 0 var(--gutter) 40px; }
.entry::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: calc(var(--axis) - 1px); width: 2px; background: var(--rule);
}
.entry--home::before { bottom: auto; height: clamp(46px, 7vw, 84px); }
.axis-fill {
  position: absolute; top: 0; left: calc(var(--gutter) + var(--axis) - 1px); width: 2px; height: var(--end, 0);
  background: var(--gold-line); transform-origin: top; transform: scaleY(var(--read, 0));
}
.entry { position: relative; display: grid; grid-template-columns: var(--axis) minmax(0, 1fr); padding: clamp(36px, 6vw, 72px) 0; }
.mark {
  font: 400 clamp(1rem, 2vw, 1.375rem)/1.3 var(--display); color: var(--seal); text-align: right;
  padding-right: clamp(14px, 2.4vw, 30px); padding-top: .32em; position: relative;
}
.mark::after {
  content: ""; position: absolute; right: -6px; top: .62em; width: 14px; height: 14px; border-radius: 50%;
  background: var(--paper); border: 3px solid var(--seal); z-index: 1;
}
.entry-body { padding-left: clamp(18px, 3vw, 44px); min-width: 0; }
.entry h2 { font-size: clamp(1.75rem, 4.2vw, 2.875rem); letter-spacing: -.015em; margin-bottom: .55em; max-width: 16em; }
.prose { max-width: 36em; }
.sources { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 10px; padding: 0; margin: 20px 0 0; max-width: 40em; }
.sources li { border-bottom: 1px solid var(--jjok); padding: 0 2px; font-size: .9875rem; color: var(--jjok); }

/* 연도 줄 */
.span-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 36px; align-items: start; }
.years { list-style: none; margin: 8px 0 0; padding: 0; max-width: 40em; }
.years li { display: grid; grid-template-columns: 7.2em minmax(0, 1fr); gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--rule); align-items: baseline; }
.years time, .years .y { font: 400 1.0625rem/1.35 var(--display); color: var(--jjok); }
.years .world { color: var(--jade); }
.years .world .y { color: var(--jade); }
.tag { font-size: .8125rem; border: 1px solid currentColor; border-radius: 3px; padding: 0 5px; margin-left: 6px; white-space: nowrap; }
.pair { margin-top: 26px; }
.years--dated { max-width: 44em; }
.years--dated li { grid-template-columns: 10em minmax(0, 1fr); }

/* 한국사와 세계사 비교 */
.compare { width: 100%; border-collapse: collapse; margin-top: 22px; }
.compare caption { text-align: left; font-size: .9375rem; color: var(--ink-soft); padding-bottom: 8px; }
.compare th, .compare td { text-align: left; font-weight: 400; vertical-align: baseline; padding: 11px 14px 11px 0; border-bottom: 1px solid var(--rule); }
.compare thead th { font-size: .9375rem; color: var(--jjok); border-bottom: 2px solid var(--jjok); padding-block: 4px 8px; }
.compare thead th:last-child { color: var(--jade); }
.compare tbody th { font: 400 1.0625rem/1.35 var(--display); color: var(--jjok); white-space: nowrap; }
.compare td.world { color: var(--jade); }

/* 기능 */
.feature { display: grid; grid-template-columns: minmax(0, 1fr); gap: 26px; padding: 26px 0; border-top: 1px solid var(--rule); align-items: start; }
.feature:first-of-type { border-top: 0; padding-top: 6px; }
.feature h3 { padding-top: .2em; font-size: clamp(1.375rem, 2.8vw, 1.875rem); margin-bottom: .4em; }
.feature .device { width: min(62vw, 250px); justify-self: center; }
.also { margin: 28px 0 0; padding: 0; list-style: none; max-width: 40em; }
.also li { padding: 12px 0; border-top: 1px solid var(--rule); }
.also b { font-weight: 400; color: var(--jjok); font-family: var(--display); font-size: 1.125rem; display: block; }

/* 우리 가족 */
.entry--home .mark { color: var(--seal); font-size: clamp(1.25rem, 2.6vw, 1.75rem); }
.entry--home .mark::after { background: var(--seal); }
.home-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 32px; align-items: start; }

/* 설치 */
.install { background: var(--jjok); color: #f3ecdc; }
.install-in { max-width: 1240px; margin: 0 auto; padding: clamp(44px, 7vw, 92px) var(--gutter); }
.install h2 { color: #f8f3e6; font-size: clamp(2rem, 5.4vw, 3.5rem); margin-bottom: .4em; }
.install .prose { margin-bottom: 26px; }
.install .small { color: #d7d3c6; margin: 20px 0 0; max-width: 38em; }
.install .stores img { height: 72px; }
.install a { color: #f8f3e6; }

/* 하단 */
.foot { max-width: 1240px; margin: 0 auto; padding: 28px var(--gutter) 40px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 28px; font-size: .9375rem; color: var(--ink-soft); }
.foot nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }

/* 안쪽 페이지: 본문 폭, 위쪽 여백, 제목 크기를 모든 페이지가 함께 쓴다 */
.page, .guide { max-width: 46rem; margin: 0 auto; padding: clamp(20px, 5vw, 56px) var(--gutter) 64px; }
.page h1, .guide-head h1 { font-size: clamp(2rem, 6vw, 3.25rem); margin-bottom: .6em; letter-spacing: -.015em; }
.page h2, .g-sec h2 { font-size: clamp(1.5rem, 3.6vw, 2rem); margin: 1.8em 0 .55em; }
.page h3, .g-item h3 { font-size: 1.3125rem; margin: 1.5em 0 .4em; }
.page h4 { font-family: var(--display); font-weight: 400; font-size: 1.125rem; color: var(--jjok); margin: 1.2em 0 .3em; }
.page ul { padding-left: 1.25em; margin: 0 0 1em; }
.page blockquote { margin: 1.2em 0; padding: .3em 0 .3em 1em; border-left: 3px solid var(--gold-line); }
.page img { margin: 1em 0; border-radius: 10px; max-height: 460px; width: auto; }
.page hr { border: 0; border-top: 1px solid var(--rule); margin: 2em 0; }

.ver { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 2px 16px; border-top: 1px solid var(--rule); padding-top: .8em; }
.ver time { font: 400 .9375rem/1.4 var(--text); color: var(--ink-soft); }

/* 의견 보내기 */
.field { display: block; margin: 0 0 18px; }
.field span { display: block; font-size: .9375rem; color: var(--jjok); margin-bottom: 6px; }
.field select, .field textarea {
  width: 100%; font: inherit; color: var(--ink); background: #fbf8f0; border: 1px solid #8d8a7c; border-radius: 4px; padding: 10px 12px;
}
.field textarea { min-height: 170px; resize: vertical; }
.btn { font: inherit; background: var(--jjok); color: #fff; border: 0; border-radius: 4px; padding: 11px 26px; cursor: pointer; }
.btn:hover { background: #142a49; }
.btn[disabled] { opacity: .6; cursor: progress; }
.status { margin-top: 16px; min-height: 1.8em; }
.status.bad { color: var(--seal); }
.status.good { color: var(--jade); }

@media (min-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1.25fr) auto; align-items: center; gap: 48px; }
  .span-grid { grid-template-columns: minmax(0, 1fr) 280px; gap: 52px; }
  .span-grid .device { width: 280px; position: sticky; top: 24px; }
  .feature { grid-template-columns: minmax(0, 1fr) 250px; gap: 48px; }
  .feature:nth-of-type(even) { grid-template-columns: 250px minmax(0, 1fr); }
  .feature:nth-of-type(even) .device { order: -1; }
  .home-grid { grid-template-columns: minmax(0, 1fr) 280px; gap: 52px; }
  .home-grid .device { width: 280px; }
}
@media (max-width: 899px) {
  .stores { justify-content: center; }
}
@media (max-width: 560px) {
  :root { --axis: 58px; }
  .slip { display: none; }
  .stores img, .install .stores img { height: 50px; }
  .stores { gap: 10px 12px; }
  .years li, .years--dated li { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .compare thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .compare, .compare caption, .compare tbody, .compare tr, .compare th, .compare td { display: block; }
  .compare tr { padding: 11px 0; border-bottom: 1px solid var(--rule); }
  .compare th, .compare td { border: 0; padding: 0; }
  .compare td.world::before { content: attr(data-label) " "; font-size: .8125rem; border: 1px solid currentColor; border-radius: 3px; padding: 0 5px; margin-right: 6px; }
  .mark { font-size: .875rem; padding-right: 12px; padding-top: .45em; }
  .mark::after { top: .55em; }
  .entry--home .mark { font-size: 1rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .stores a { transition: none; }
  .axis-fill { display: none; }
}

/* 사용설명서 */
.guide { display: grid; grid-template-columns: minmax(0, 1fr); }
.guide-head p { margin-bottom: 0; }
.toc { margin-top: 24px; padding: 14px 0; border-block: 1px solid var(--rule); }
.toc-title { font: 400 1.125rem/1.3 var(--display); color: var(--jjok); margin: 0 0 6px; }
.toc ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 2px 18px; }
.toc a { display: block; padding: 4px 0; color: var(--ink); text-decoration: none; }
.toc a:hover, .toc a[aria-current] { color: var(--seal); text-decoration: underline; }
.g-sec { padding-top: clamp(32px, 5vw, 48px); scroll-margin-top: 16px; }
.g-sec + .g-sec { margin-top: clamp(32px, 5vw, 48px); border-top: 1px solid var(--rule); }
.g-sec h2 { margin: 0 0 .8em; }
.shots { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 24px clamp(16px, 2.4vw, 28px); margin-bottom: 28px; }
.shot { margin: 0; min-width: 0; }
.shot .device { width: 100%; border-radius: 22px; padding: 5px; }
.shot .device img { border-radius: 18px; margin: 0; max-height: none; width: 100%; }
.shot figcaption { font-size: .9375rem; color: var(--ink-soft); text-align: center; margin-top: 10px; }
.g-sec--one .shots { grid-template-columns: minmax(0, 210px); }
.shot--wide { margin-top: 32px; }
.shot--inline { max-width: 210px; margin: 1.2em 0; }
.shot .device.device--wide { margin-top: 0; max-width: none; border-radius: 22px; padding: 7px; }
.g-item { padding: 18px 0; border-top: 1px solid var(--rule); }
.g-item:first-child { border-top: 0; padding-top: 0; }
.g-item h3 { margin: 0 0 .35em; }
.g-item p { margin: 0; }
.guide-next { margin: 40px 0 0; padding-top: 24px; border-top: 1px solid var(--rule); }
@media (min-width: 900px) {
  .guide { max-width: calc(46rem + 226px); grid-template-columns: 170px minmax(0, 1fr); column-gap: 56px; }
  .guide-head, .guide-body { grid-column: 2; }
  .toc { grid-column: 1; grid-row: 1 / span 2; position: sticky; top: 24px; align-self: start; margin-top: 0; padding: 0; border: 0; }
  .toc-title { margin-bottom: 8px; }
  .toc ol { display: block; }
  .toc a { padding: 7px 0 7px 14px; border-left: 2px solid var(--rule); }
  .toc a[aria-current] { border-left-color: var(--seal); text-decoration: none; }
}
@media (min-width: 1000px) {
  .g-sec--one { display: grid; grid-template-columns: 200px minmax(0, 1fr); column-gap: 36px; align-items: start; }
  .g-sec--one h2 { grid-column: 1 / -1; }
  .g-sec--one .shots { grid-template-columns: minmax(0, 1fr); margin-bottom: 0; }
}
@media (max-width: 560px) {
  .top { padding-block: 14px; }
  .top nav { gap: 2px 14px; font-size: .875rem; }
}