/* 색은 Claude Design 시안(A안, 원고지)의 값을 그대로 옮겼다. 다크 테마는 시스템 설정을 따르고, 테마 버튼으로 고정할 수 있다. */
:root {
  color-scheme: light;
  --bg: #FBFAF6; --surface: #FFFFFF; --ink: #1B1B1A; --ink2: #3A3833; --muted: #5E5B55;
  --rule: #E4E0D6; --rule2: #D8D3C7; --accent: #B5381F; --on-accent: #FFFFFF; --grid: rgba(181, 56, 31, 0.45);
  --inv-bg: #1B1B1A; --inv-ink: #F4F2EC; --inv-strong: #FFFFFF; --inv-accent: #F08A6E; --inv-rule: #3A3833;
  --inv-muted: #BDB8AC; --inv-code: #0F0F0E;
  --d-bg: #FFFFFF; --d-head: #FBFAF6; --d-ink: #1B1B1A; --d-muted: #5E5B55; --d-rule: #E4E0D6; --d-accent: #B5381F;
  --del-bg: rgba(181, 56, 31, 0.07); --del-word: rgba(181, 56, 31, 0.22);
  --add-bg: rgba(36, 90, 160, 0.07); --add-word: rgba(36, 90, 160, 0.22);
  --empty-bg: #F4F2EC; --code-bg: rgba(27, 27, 26, 0.07); --del-mark: #B5381F; --add-mark: #245AA0;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #161513; --surface: #1E1D1A; --ink: #EDEAE2; --ink2: #CFCBC1; --muted: #A39E93;
  --rule: #2F2D29; --rule2: #3A3833; --accent: #F08A6E; --on-accent: #1B1B1A; --grid: rgba(240, 138, 110, 0.38);
  --inv-bg: #0E0D0C; --inv-ink: #EDEAE2; --inv-strong: #FFFFFF; --inv-accent: #F08A6E; --inv-rule: #2F2D29;
  --inv-muted: #A39E93; --inv-code: #000000;
  --d-bg: #1E1D1A; --d-head: #161513; --d-ink: #EDEAE2; --d-muted: #A39E93; --d-rule: #2F2D29; --d-accent: #F08A6E;
  --del-bg: rgba(240, 138, 110, 0.10); --del-word: rgba(240, 138, 110, 0.30);
  --add-bg: rgba(120, 170, 240, 0.10); --add-word: rgba(120, 170, 240, 0.30);
  --empty-bg: #191815; --code-bg: rgba(237, 234, 226, 0.09); --del-mark: #F08A6E; --add-mark: #8FB2E8;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #161513; --surface: #1E1D1A; --ink: #EDEAE2; --ink2: #CFCBC1; --muted: #A39E93;
    --rule: #2F2D29; --rule2: #3A3833; --accent: #F08A6E; --on-accent: #1B1B1A; --grid: rgba(240, 138, 110, 0.38);
    --inv-bg: #0E0D0C; --inv-ink: #EDEAE2; --inv-strong: #FFFFFF; --inv-accent: #F08A6E; --inv-rule: #2F2D29;
    --inv-muted: #A39E93; --inv-code: #000000;
    --d-bg: #1E1D1A; --d-head: #161513; --d-ink: #EDEAE2; --d-muted: #A39E93; --d-rule: #2F2D29; --d-accent: #F08A6E;
    --del-bg: rgba(240, 138, 110, 0.10); --del-word: rgba(240, 138, 110, 0.30);
    --add-bg: rgba(120, 170, 240, 0.10); --add-word: rgba(120, 170, 240, 0.30);
    --empty-bg: #191815; --code-bg: rgba(237, 234, 226, 0.09); --del-mark: #F08A6E; --add-mark: #8FB2E8;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, 'Apple SD Gothic Neo', 'Noto Sans KR', sans-serif;
}
/* Pretendard는 한글과 라틴 문자를 그린다. 일본어와 중국어 페이지는 가나와 한자를 그 언어 글꼴로 그린다. */
html:lang(ja) body {
  font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', 'Yu Gothic', sans-serif;
}
html:lang(zh) body {
  font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.75; letter-spacing: -0.01em; overflow-wrap: break-word; line-break: strict;
  -webkit-text-size-adjust: 100%;
}
/* 한국어는 어절 단위로 줄을 바꾼다. 일본어와 중국어 페이지는 글자 단위로 바꾸되, 그 안의 한국어 예시는 lang="ko"로 어절을 지킨다. */
:lang(ko) { word-break: keep-all; }
a { color: var(--accent); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
code { font-family: var(--mono); }
.wrap { max-width: 1120px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.sr { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: 16px; top: -100px; z-index: 10; padding: 12px 16px; background: var(--ink); color: var(--bg); font-weight: 600; }
.skip:focus { top: 16px; }

/* 머리 */
.top { padding-top: 24px; padding-bottom: 24px; display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
.brand { color: var(--ink); text-decoration: none; font-weight: 600; font-size: 17px; }
.top nav { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 20px; font-size: 15px; }
.top nav a { color: var(--ink); text-decoration: none; padding: 10px 0; }
.top nav a:hover { text-decoration: underline; }
.theme-wrap { position: relative; display: none; }
.theme-ready .theme-wrap { display: block; }
.theme {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 12px 0 14px;
  border: 1px solid var(--rule2); border-radius: 999px; background: transparent; color: var(--ink); font: inherit; font-size: 14px; cursor: pointer;
}
.theme[aria-expanded="true"] { background: var(--code-bg); }
.theme .chevron { transition: transform 0.15s; }
.theme[aria-expanded="true"] .chevron { transform: rotate(180deg); }
@media (prefers-reduced-motion: reduce) { .theme .chevron { transition: none; } }
.theme-menu {
  position: absolute; right: 0; top: calc(100% + 8px); z-index: 5; min-width: 196px; padding: 6px;
  background: var(--surface); border: 1px solid var(--rule2); border-radius: 12px; box-shadow: 0 12px 32px rgba(27, 27, 26, 0.12);
}
:root[data-theme="dark"] .theme-menu { box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .theme-menu { box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5); } }
@media (max-width: 640px) { .theme-menu { right: auto; left: 0; } }
.theme-menu button {
  display: flex; width: 100%; align-items: center; gap: 10px; min-height: 44px; padding: 6px 12px; border: 0; border-radius: 8px;
  background: transparent; color: var(--ink); font: inherit; font-size: 14px; line-height: 1.4; text-align: left; cursor: pointer;
}
.theme-menu button > span { flex: 1; }
.theme-menu small { display: block; font-size: 12px; color: var(--muted); }
.theme-menu button:hover, .theme-menu button:focus-visible { background: var(--code-bg); }
.theme-menu button:focus-visible { outline-offset: -3px; }
.theme-menu [aria-checked="true"] { background: var(--del-bg); }
.theme-menu .check { visibility: hidden; color: var(--accent); }
.theme-menu [aria-checked="true"] .check { visibility: visible; }
.theme .i-moon { display: none; }
:root[data-theme="dark"] .theme .i-sun { display: none; }
:root[data-theme="dark"] .theme .i-moon { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme .i-sun { display: none; }
  :root:not([data-theme="light"]) .theme .i-moon { display: inline; }
}

/* 첫 화면 */
.hero { padding-top: 56px; padding-bottom: 88px; }
.wongoji { display: grid; border-top: 1px solid var(--grid); border-left: 1px solid var(--grid); }
.wongoji span {
  aspect-ratio: 1; display: grid; place-items: center; border-right: 1px solid var(--grid); border-bottom: 1px solid var(--grid);
  font-weight: 800; line-height: 1;
}
.wongoji .dot { color: var(--accent); }
.w12 { grid-template-columns: repeat(12, minmax(0, 1fr)); max-width: 960px; font-size: clamp(28px, 5.4vw, 64px); }
.w6 { display: none; grid-template-columns: repeat(6, minmax(0, 1fr)); max-width: 480px; font-size: clamp(24px, 9vw, 44px); }
@media (max-width: 640px) {
  .w12 { display: none; }
  .w6 { display: grid; }
}
h1 { margin: 40px 0 0; max-width: 760px; font-weight: 700; font-size: clamp(26px, 3.4vw, 40px); line-height: 1.45; letter-spacing: -0.02em; }
.lead { margin: 20px 0 0; max-width: 680px; font-size: 18px; color: var(--ink2); }
.cta { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 0 24px; border: 1.5px solid var(--ink);
  color: var(--ink); text-decoration: none; font-weight: 600; font-size: 16px;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

/* 공통 절 */
.band { border-top: 1px solid var(--rule); }
.band > .wrap { padding-top: 88px; padding-bottom: 88px; }
.surface { background: var(--surface); }
.eyebrow { margin: 0; font-family: var(--mono); font-size: 14px; color: var(--accent); }
h2 { margin: 12px 0 0; font-weight: 800; font-size: clamp(26px, 3vw, 36px); line-height: 1.4; letter-spacing: -0.02em; }
.sub { margin: 12px 0 0; max-width: 720px; color: var(--muted); }
.foot { margin: 24px 0 0; font-size: 14px; color: var(--muted); }

/* 전후 비교 */
.diff-band { background: var(--d-bg); }
.diff-band .eyebrow, .diff-band .foot a { color: var(--d-accent); }
.diff-band .sub, .diff-band .foot { color: var(--d-muted); }
.stats { margin: 40px 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 14px; color: var(--d-muted); }
.stats span { font-family: var(--mono); color: var(--d-ink); }
.diff { margin-top: 16px; border: 1px solid var(--d-rule); overflow: hidden; }
.pair { display: flex; flex-wrap: wrap; }
.head { background: var(--d-head); border-bottom: 1px solid var(--d-rule); font-size: 13px; font-weight: 600; }
.head .side { padding: 10px 16px; }
.head .old { color: var(--del-mark); }
.head .new { color: var(--add-mark); }
.drow { border-bottom: 1px solid var(--d-rule); }
.drow:last-child { border-bottom: 0; }
.side { flex: 1 1 320px; min-width: 0; }
.drow .side {
  display: grid; grid-template-columns: 36px 16px minmax(0, 1fr) minmax(48px, auto); gap: 0 4px; padding: 10px 12px 10px 0;
}
.drow .side.new { border-left: 1px solid var(--d-rule); }
.drow .old { background: var(--del-bg); }
.drow .new { background: var(--add-bg); }
.drow.ctx .side { background: transparent; }
.drow .side.empty { background: var(--empty-bg); }
.count { white-space: nowrap; }
.ln, .count { text-align: right; font-family: var(--mono); font-size: 12px; color: var(--d-muted); padding-top: 3px; }
.mark { font-family: var(--mono); font-size: 14px; }
.old .mark { color: var(--del-mark); }
.new .mark { color: var(--add-mark); }
.drow p { margin: 0; font-size: 15px; line-height: 1.75; }
.drow code { font-size: 0.88em; padding: 0 3px; border-radius: 3px; background: var(--code-bg); }
del, ins { padding: 0 3px; border-radius: 3px; color: inherit; }
del { background: var(--del-word); text-decoration: line-through; }
ins { background: var(--add-word); text-decoration: none; }
del code, ins code { background: transparent; padding: 0; }
.drow .note {
  padding: 8px 16px 10px 56px; background: var(--d-head); border-top: 1px dashed var(--d-rule); font-size: 13px; color: var(--d-muted);
}
.note span { color: var(--d-ink); }

/* 측정 결과 */
.metrics { margin: 40px 0 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); border-top: 1px solid var(--ink); }
.metrics > div { padding: 28px 24px 28px 0; border-bottom: 1px solid var(--rule); }
.metrics dt { margin: 0 0 4px; font-size: 14px; font-weight: 600; color: var(--ink2); }
.metrics dd { margin: 8px 0 0; font-size: 15px; color: var(--ink2); }
.metrics dd.num {
  margin: 0; font-family: var(--mono); font-size: clamp(30px, 2.8vw, 36px); font-weight: 500; letter-spacing: -0.03em;
  white-space: nowrap; color: var(--ink);
}
.num em { font-style: normal; color: var(--accent); }
.num .unit { font-size: 0.6em; }

/* 규칙 */
.rules { margin: 40px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr)); gap: 0 48px; }
.rules li { display: grid; grid-template-columns: 88px minmax(0, 1fr); gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--rule); }
.tag { font-family: var(--mono); font-size: 14px; color: var(--accent); padding-top: 3px; }
.rule { margin: 0; font-size: 16px; font-weight: 600; }
.before { margin: 4px 0 0; font-size: 15px; color: var(--muted); }

/* 표기 */
.terms { margin: 40px 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 12px; }
.terms li { display: inline-flex; align-items: baseline; gap: 10px; padding: 12px 18px; border: 1px solid var(--rule2); background: var(--surface); font-size: 17px; }
.terms span { font-size: 13px; color: var(--muted); }

/* 설치 */
.inverse { background: var(--inv-bg); color: var(--inv-ink); border-top-color: var(--rule); }
.inverse .eyebrow { color: var(--inv-accent); }
.inverse h2 { color: var(--inv-strong); }
.inverse .foot { color: var(--inv-muted); }
.inverse a { color: var(--inv-accent); }
.inverse button:focus-visible { outline-color: var(--inv-accent); }
.installs { margin: 40px 0 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 16px; }
.installs li { display: flex; flex-wrap: wrap; gap: 16px 32px; align-items: center; border: 1px solid var(--inv-rule); padding: 24px; }
.installs li > div:first-child { flex: 1 1 240px; min-width: 0; }
.installs h3 { margin: 0; font-weight: 600; font-size: 17px; color: var(--inv-strong); }
.installs p { margin: 6px 0 0; font-size: 14px; color: var(--inv-muted); }
.cmd { flex: 2 1 420px; min-width: 0; display: flex; align-items: center; gap: 8px; padding: 10px 6px 10px 16px; background: var(--inv-code); }
.cmd pre { flex: 1; min-width: 0; margin: 0; font-size: 13px; line-height: 1.7; color: var(--inv-ink); white-space: pre-wrap; overflow-wrap: anywhere; }
.copy {
  flex: none; display: inline-grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 0;
  background: transparent; color: var(--inv-muted); cursor: pointer;
}
.copy[hidden] { display: none; }
.copy:hover { color: var(--inv-ink); }
.copy.done { color: var(--inv-accent); }
.copy .i-done, .copy.done .i-copy { display: none; }
.copy.done .i-done { display: block; }

/* 꼬리 */
.bottom { padding-top: 40px; padding-bottom: 56px; display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; font-size: 14px; color: var(--muted); }
.bottom p { margin: 0; }
.bottom nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
.bottom nav a { padding: 4px 0; }
.bottom nav a[aria-current] { color: var(--ink); }