/* coo001.com — 밝은 종이 위에 기록한 개인 연구실형 홈페이지. */

:root {
  --bg: #fdfdfb;
  --surface: #ffffff;
  --surface-2: #f5f2ee;
  --line: #ddd8d1;

  /* #fdfdfb 위 실측 대비(WCAG AA 4.5:1 기준)
     #171717 17.60:1 ✓  /  #4f4b47 8.49:1 ✓  /  #6a645f 5.73:1 ✓
     #862633 8.82:1 ✓ — 링크·버튼·짧은 표식에만 쓴다. */
  --ink: #171717;
  --ink-sub: #4f4b47;
  --ink-tertiary: #6a645f;
  --accent: #862633;
  --accent-strong: #681d28;
  --accent-soft: #f7ecee;

  /* 기존 공개·관리 화면이 공유하는 의미 토큰. 값만 밝은 팔레트로 잇는다. */
  --w: var(--ink);
  --w-2: var(--ink-sub);
  --w-3: var(--ink-tertiary);
  --surface-sub: var(--surface-2);
  --primary: var(--accent);
  --primary-strong: var(--accent-strong);
  --primary-deep: var(--accent-strong);
  --primary-soft: var(--accent-soft);
  --neon: var(--accent); /* ledger·pillow·admin.css 가 아직 이 이름을 쓴다 — 글자색·막대 채움뿐이라 크림슨으로 안전 */

  --r-sm: 3px;
  --r-md: 5px;
  --r-lg: 8px;
  --r-pill: 9999px;
  --s-xs: 4px;
  --s-sm: 8px;
  --s-md: 16px;
  --s-lg: 24px;
  --s-xl: 40px;

  --font: 'Pretendard', 'Pretendard Variable', 'Apple SD Gothic Neo',
          'Noto Sans KR', system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;
  --shell-max: 1080px;
  --reading-max: 760px;
  --pad-x: 20px;
}

@media (min-width: 600px) { :root { --pad-x: 32px; } }
@media (min-width: 1024px) { :root { --pad-x: 48px; } }

*, *::before, *::after { box-sizing: border-box; }

html {
  background: var(--bg);
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.72;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { margin: 0; color: var(--ink); font-weight: 700; letter-spacing: -0.035em; line-height: 1.28; }
p { margin: 0; }
img { display: block; max-width: 100%; height: auto; }
button, input, textarea, select { font: inherit; }

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-strong); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 12px 18px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
}
.skip:focus { left: 8px; top: 8px; }

.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-left: calc(var(--pad-x) + env(safe-area-inset-left, 0px));
  padding-right: calc(var(--pad-x) + env(safe-area-inset-right, 0px));
}

.rule { height: 1px; margin: 0; border: 0; background: var(--line); }
.section { padding: 56px 0; }
@media (min-width: 1024px) { .section { padding: 72px 0; } }

.sec-head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 20px;
}
.sec-title { font-size: clamp(1.65rem, 3vw, 2rem); }
.sec-title::after,
.academic-title::after {
  display: block;
  width: 44px;
  height: 3px;
  margin-top: 11px;
  background: var(--accent);
  content: '';
}
.sec-sub { max-width: 46em; margin-top: 12px; color: var(--ink-sub); font-size: 0.9375rem; }
.sec-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
}
.sec-link:hover { text-decoration: underline; }

.label,
.section-kicker {
  color: var(--accent) !important;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.mono { color: var(--ink-tertiary); font-family: var(--mono); font-size: 0.8125rem; }

/* 머리·꼬리 */

.announcement {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-sub);
  font-size: 0.8125rem;
  text-align: center;
}
.announcement .shell { padding-top: 8px; padding-bottom: 8px; }
.announcement a { margin-left: 4px; font-weight: 700; }

.site-head { border-bottom: 1px solid var(--line); background: rgb(253 253 251 / 96%); }
.site-head > .shell {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
  align-items: center;
  justify-content: space-between;
  min-height: 66px;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ink);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-decoration: none;
}
.wordmark:hover { color: var(--accent); }
.site-head nav { display: flex; flex-wrap: wrap; gap: 0 2px; }
.site-head nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 10px;
  color: var(--ink-sub);
  font-size: 0.875rem;
  text-decoration: none;
}
.site-head nav a:hover,
.site-head nav a[aria-current='page'] { color: var(--accent); }
.site-head nav a[aria-current='page'] { font-weight: 700; }

.site-foot { border-top: 1px solid var(--line); background: var(--surface); }
.site-foot > .shell {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 32px;
  align-items: center;
  justify-content: space-between;
  padding-top: 38px;
  padding-bottom: calc(38px + env(safe-area-inset-bottom, 0px));
}
.foot-head { font-size: 1.125rem; font-weight: 700; letter-spacing: -0.025em; }
.foot-mail { display: inline-flex; align-items: center; min-height: 44px; font-size: 0.9375rem; }
.site-foot .foot-git { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink-tertiary); font-size: 0.875rem; }

/* 버튼 */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--ink);
  font-size: 0.9375rem;
  font-weight: 700;
  text-decoration: none;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-neon { border-color: var(--accent); background: var(--accent); color: #ffffff; }
.btn-neon:hover { border-color: var(--accent-strong); background: var(--accent-strong); color: #ffffff; }
.btn-ghost,
.btn-quiet { border-color: var(--line); background: transparent; color: var(--ink); }

/* 홈 */

.home-hero { padding: 68px 0 58px; text-align: center; }
.home-hero-inner { max-width: 880px; }
.home-name { font-size: clamp(3.25rem, 10vw, 5.75rem); font-weight: 700; letter-spacing: -0.065em; line-height: 1.05; }
.home-subtitle { margin-top: 15px; color: var(--ink-sub); font-size: clamp(1rem, 2.4vw, 1.25rem); }
.home-profile { display: grid; justify-items: center; gap: 28px; margin-top: 38px; }
.home-photo {
  width: 132px;
  aspect-ratio: 4 / 5;
  border: 1px solid var(--line);
  background: var(--surface-2);
  object-fit: cover;
}
.home-facts {
  display: grid;
  width: min(100%, 720px);
  margin: 0;
  border-top: 1px solid var(--line);
  text-align: left;
}
.home-facts div {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--line);
}
.home-facts dt { color: var(--ink-tertiary); font-size: 0.8125rem; }
.home-facts dd { margin: 0; font-size: 0.875rem; font-weight: 600; }
@media (min-width: 720px) {
  .home-profile { grid-template-columns: 132px minmax(0, 1fr); align-items: center; justify-items: start; text-align: left; }
  .home-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .home-facts div { grid-template-columns: 100px minmax(0, 1fr); padding-inline: 18px; }
  .home-facts div:nth-child(odd) { border-right: 1px solid var(--line); }
}

.home-intro { padding: 54px 0 68px; border-top: 1px solid var(--line); }
.home-intro .shell { max-width: calc(var(--reading-max) + (var(--pad-x) * 2)); }
.intro-mark { margin-bottom: 22px; color: var(--accent); font-size: 0.8125rem; font-weight: 700; letter-spacing: 0.08em; }
.intro-copy { color: var(--ink); font-size: clamp(1.1rem, 2.2vw, 1.28rem); line-height: 1.85; }
.intro-copy + .intro-copy { margin-top: 20px; color: var(--ink-sub); }

.academic-section { padding: 62px 0; border-top: 1px solid var(--line); }
.academic-head {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 25px;
}
.academic-title { font-size: clamp(1.65rem, 3vw, 2rem); }
.academic-note { margin-top: 12px; color: var(--ink-tertiary); font-size: 0.875rem; }

.principle-list { margin: 0; padding: 0; list-style: none; counter-reset: principle; }
.principle-row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  counter-increment: principle;
}
.principle-row::before { color: var(--accent); content: counter(principle, decimal-leading-zero); font-family: var(--mono); font-size: 0.8125rem; font-weight: 700; }
.principle-row h3 { font-size: 1.125rem; }
.principle-row p { margin-top: 7px; color: var(--ink-sub); font-size: 0.9375rem; }
@media (min-width: 720px) {
  .principle-row { grid-template-columns: 54px 200px minmax(0, 1fr); gap: 24px; }
  .principle-row p { margin-top: 0; }
}

.publication-list,
.news-list { margin: 0; padding: 0; list-style: none; }
.publication-row,
.news-row { display: grid; gap: 8px 20px; padding: 22px 0; border-top: 1px solid var(--line); }
.publication-when,
.news-date { color: var(--accent); font-family: var(--mono); font-size: 0.8125rem; font-weight: 600; }
.publication-main h3,
.news-main h3 { font-size: 1.125rem; }
.publication-main h3 a,
.news-main h3 a { color: var(--ink); text-decoration: none; }
.publication-main h3 a:hover,
.news-main h3 a:hover { color: var(--accent); text-decoration: underline; }
.publication-summary,
.news-summary { margin-top: 6px; color: var(--ink-sub); font-size: 0.9375rem; }
.publication-outcome { margin-top: 5px; color: var(--accent); font-size: 0.875rem; }
.publication-role,
.news-tag { color: var(--ink-tertiary); font-size: 0.8125rem; font-weight: 600; }
@media (min-width: 760px) {
  .publication-row { grid-template-columns: 120px minmax(0, 1fr) 150px; align-items: start; }
  .publication-role { text-align: right; }
  .news-row { grid-template-columns: 110px minmax(0, 1fr) 110px; align-items: start; }
  .news-tag { text-align: right; }
}

.contact-cta { padding: 70px 0; border-top: 1px solid var(--line); text-align: center; }
.contact-cta .shell { max-width: 780px; }
.contact-cta h2 { font-size: clamp(1.8rem, 4vw, 2.4rem); }
.contact-cta h2::after { display: block; width: 44px; height: 3px; margin: 14px auto 0; background: var(--accent); content: ''; }
.contact-cta p { margin: 20px auto 0; color: var(--ink-sub); }
.contact-cta .btn { margin-top: 26px; }

/* 기존 공개 페이지 히어로·목록 */

.hero { padding: 56px 0 64px; }
.hero-grid,
.about-grid { display: grid; gap: 34px; }
.hero h1,
.about-grid h1 { font-size: clamp(2rem, 6vw, 3.25rem); }
.hero .lede { max-width: 46em; margin-top: 22px; color: var(--ink-sub); }
.hero .lede + .lede { margin-top: 14px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.photo {
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface-2);
  color: var(--ink-tertiary);
  font-size: 0.875rem;
}
.photo-img { display: block; object-fit: cover; }
.about-role { margin-top: 12px; color: var(--accent); font-size: 1.0625rem; font-weight: 700; }
@media (min-width: 900px) {
  .hero-grid,
  .about-grid { grid-template-columns: minmax(0, 1fr) 320px; gap: 64px; align-items: start; }
}

.facts { margin: 22px 0 0; }
.facts div { display: flex; gap: 16px; justify-content: space-between; padding: 12px 0; border-top: 1px solid var(--line); }
.facts dt { color: var(--ink-tertiary); font-size: 0.8125rem; }
.facts dd { margin: 0; font-size: 0.875rem; font-weight: 600; text-align: right; }

.works { margin: 0; padding: 0; list-style: none; }
.work { display: grid; gap: 8px 20px; padding: 23px 0; border-top: 1px solid var(--line); }
.work-no,
.work-period { color: var(--ink-tertiary); font-family: var(--mono); font-size: 0.8125rem; }
.work-title { font-size: 1.25rem; }
.work-title a { color: var(--ink); text-decoration: none; }
.work-title a:hover { color: var(--accent); text-decoration: underline; }
.work-period { margin-top: 5px; }
.work-did { color: var(--ink-sub); font-size: 0.9375rem; }
.work-outcome { margin-top: 5px; color: var(--accent); font-size: 0.875rem; }
.work-role { font-size: 0.8125rem; font-weight: 700; }
.work-more { margin-top: 6px; color: var(--accent); font-size: 0.8125rem; }
@media (min-width: 900px) {
  .work { grid-template-columns: 38px 190px minmax(0, 1fr) 130px; gap: 26px; }
  .work-role,
  .work-more { text-align: right; }
}

.filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 28px 0 18px; }
.chip {
  display: inline-flex;
  align-items: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--surface);
  color: var(--ink-sub);
  font-size: 0.875rem;
  font-weight: 600;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip[aria-current='true'] { border-color: var(--accent); background: var(--accent); color: #ffffff; }
.count { color: var(--ink-tertiary); font-family: var(--mono); font-size: 0.8125rem; text-align: right; }

.posts,
.post-list { margin: 0; padding: 0; list-style: none; }
.post-card,
.post-row { display: grid; gap: 8px 20px; padding: 22px 0; border-top: 1px solid var(--line); }
.post-card .meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.post-card h3,
.post-row h2 { font-size: 1.2rem; }
.post-card h3 a,
.post-row h2 a { color: var(--ink); text-decoration: none; }
.post-card h3 a:hover,
.post-row h2 a:hover { color: var(--accent); text-decoration: underline; }
.post-card p,
.post-row p { color: var(--ink-sub); font-size: 0.9375rem; }
.post-row .date { color: var(--accent); font-family: var(--mono); font-size: 0.8125rem; }
.tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--surface);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
}
@media (min-width: 900px) { .post-row { grid-template-columns: 110px minmax(0, 1fr) auto; gap: 28px; } }

/* 상세·소개 */

.case-head { padding: 36px 0 50px; }
.back { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink-tertiary); font-size: 0.875rem; text-decoration: none; }
.back:hover { color: var(--accent); }
.case-meta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 24px; }
.tag-solid { padding: 4px 11px; border: 1px solid var(--accent); border-radius: var(--r-pill); color: var(--accent); font-size: 0.8125rem; font-weight: 700; }
.case-head h1 { margin-top: 18px; font-size: clamp(1.9rem, 5.4vw, 3rem); }
.case-head .lede { max-width: 44em; margin-top: 18px; color: var(--ink-sub); font-size: 1.0625rem; }
.case-facts { display: grid; margin: 32px 0 0; }
.case-facts div { padding: 12px 0; border-top: 1px solid var(--line); }
.case-facts dt { color: var(--ink-tertiary); font-size: 0.8125rem; }
.case-facts dd { margin: 5px 0 0; font-size: 0.9375rem; font-weight: 600; }
@media (min-width: 600px) { .case-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 900px) {
  .case-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .case-facts div { padding: 0 22px; border-top: 0; border-left: 1px solid var(--line); }
  .case-facts div:first-child { padding-left: 0; border-left: 0; }
}

.band { padding: 44px 0 0; }
.band-grid { display: grid; gap: 14px; }
@media (min-width: 900px) { .band-grid { grid-template-columns: 145px minmax(0, 1fr); gap: 48px; } }

.steps,
.timeline { margin: 0; padding: 0; list-style: none; }
.step,
.tl-row { display: grid; gap: 8px 20px; padding: 20px 0; border-top: 1px solid var(--line); }
.step:first-child,
.tl-row:first-child { padding-top: 0; border-top: 0; }
.step .mono,
.tl-row .when { color: var(--accent); font-family: var(--mono); font-size: 0.8125rem; font-weight: 700; }
.step h3 { font-size: 1.125rem; }
.step p,
.tl-row p { margin-top: 6px; color: var(--ink-sub); font-size: 0.9375rem; }
.tl-head { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: baseline; }
.tl-head b { color: var(--ink); font-size: 1.125rem; }
.tl-head span { color: var(--ink-tertiary); font-size: 0.875rem; }
@media (min-width: 900px) {
  .step { grid-template-columns: 40px minmax(0, 1fr); }
  .tl-row { grid-template-columns: 110px minmax(0, 1fr); gap: 28px; }
}

.results { display: grid; gap: 0; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.result { padding: 18px 0; border-bottom: 1px solid var(--line); }
.result dt { color: var(--ink-tertiary); font-size: 0.8125rem; }
.result dd { margin: 6px 0 0; color: var(--accent); font-size: 1.0625rem; font-weight: 700; }
@media (min-width: 600px) { .results { grid-template-columns: repeat(3, minmax(0, 1fr)); } .result { padding-inline: 18px; border-right: 1px solid var(--line); } .result:first-child { padding-left: 0; } .result:last-child { border-right: 0; } }

.next { display: flex; gap: 16px; align-items: center; justify-content: space-between; margin-top: 54px; padding-top: 22px; border-top: 3px solid var(--accent); text-decoration: none; }
.next .k { display: block; color: var(--ink-tertiary); font-size: 0.8125rem; }
.next .t { display: block; margin-top: 6px; color: var(--ink); font-size: 1.25rem; font-weight: 700; }
.next .arrow { color: var(--accent); font-size: 1.6rem; }

.tools { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.tools li { padding: 7px 12px; border: 1px solid var(--line); border-radius: var(--r-pill); background: var(--surface); font-size: 0.875rem; font-weight: 600; }
.shots { display: grid; gap: 14px; margin-top: 24px; }
.shots img { width: 100%; aspect-ratio: 3 / 2; border: 1px solid var(--line); border-radius: var(--r-md); object-fit: cover; }
@media (min-width: 600px) { .shots { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

/* 본문 */

.prose { max-width: 44em; color: var(--ink-sub); }
.prose > :first-child { margin-top: 0; }
.prose p { margin: 0 0 18px; font-size: 1.0625rem; line-height: 1.85; }
.prose h2 { margin: 40px 0 14px; font-size: 1.375rem; }
.prose h2::after { display: block; width: 36px; height: 3px; margin-top: 9px; background: var(--accent); content: ''; }
.prose h3 { margin: 28px 0 10px; font-size: 1.125rem; }
.prose strong { color: var(--ink); }
.prose a { color: var(--accent); }
.prose ul, .prose ol { margin: 0 0 18px; padding-left: 22px; }
.prose li { margin-bottom: 8px; }
.prose blockquote { margin: 24px 0; padding: 4px 0 4px 18px; border-left: 3px solid var(--accent); color: var(--ink); }
.prose code { padding: 2px 6px; border-radius: 3px; background: var(--surface-2); color: var(--accent); font-family: var(--mono); font-size: 0.9em; }
.prose hr { height: 1px; margin: 32px 0; border: 0; background: var(--line); }

/* 404·빈 상태 */

.nf { display: grid; place-items: center; padding: 90px var(--pad-x) 110px; text-align: center; }
.nf .code { color: var(--accent); font-family: var(--mono); font-size: clamp(3.5rem, 14vw, 6.875rem); font-weight: 800; line-height: 1; }
.nf h1 { margin-top: 20px; font-size: clamp(1.4rem, 4.6vw, 1.9rem); }
.nf p { margin-top: 12px; color: var(--ink-sub); }
.nf .hero-actions { justify-content: center; }
.empty { padding: 36px 20px; border: 1px dashed var(--line); color: var(--ink-tertiary); text-align: center; }

/* 독립 기능 페이지가 새 팔레트를 상속할 때의 가시성 보강. */
.pillow-page .section-kicker,
.pillow-page .summary-grid dd { color: var(--accent) !important; }
.pillow-page .bar-fill { background: var(--accent) !important; }

@media (max-width: 599px) {
  .announcement .shell { padding-top: 7px; padding-bottom: 7px; }
  .site-head > .shell { display: block; padding-top: 8px; padding-bottom: 8px; text-align: center; }
  .wordmark { justify-content: center; }
  .site-head nav { justify-content: center; }
  .home-hero { padding-top: 52px; }
  .home-facts div { grid-template-columns: 94px minmax(0, 1fr); }
  .publication-role,
  .news-tag { margin-top: 3px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *:not([data-motion='keep'], [data-motion='keep'] *),
  *:not([data-motion='keep'], [data-motion='keep'] *)::before,
  *:not([data-motion='keep'], [data-motion='keep'] *)::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}