/* ============================================================
   sangmoon.me — 오래된 몸, 새로운 병
   결: 긴장·명제형. 뼈처럼 밝은 종이 위의 잉크.
   붉은 색은 단 하나의 의미로만 쓴다 — 「산업화 이후, 지금」.
   ============================================================ */

:root {
  --paper: #F6F5F1;
  --paper-deep: #EDEBE3;
  --ink: #1C1914;
  --ink-soft: #5C5548;
  --hairline: #DCD7CB;
  --now: #A8331C;
  --strata-1: #26211A;
  --strata-2: #544A3B;
  --strata-3: #8B7E68;
  --serif: Georgia, "Times New Roman", serif;
  --sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
          system-ui, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.85;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(168, 51, 28, 0.16); }

img, svg { max-width: 100%; height: auto; }

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--hairline);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}
a:hover { text-decoration-color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--now);
  outline-offset: 3px;
  border-radius: 1px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1rem;
  z-index: 10;
  text-decoration: none;
}
.skip:focus { left: 0.5rem; }

.wrap {
  max-width: 68rem;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 2.5rem);
}

/* ---------- 머리 ---------- */

.site-head {
  border-bottom: 1px solid var(--hairline);
}
.head-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 1.75rem;
  padding-block: 1.1rem;
}
.brand {
  font-weight: 750;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.brand .brand-en {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-left: 0.55rem;
  letter-spacing: 0;
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.1rem;
  margin-left: auto;
  font-size: 0.88rem;
}
.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  padding-block: 0.15rem;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 650;
  border-bottom: 2px solid var(--now);
}

/* ---------- 라벨·눈썹 ---------- */

.eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.17em;
  color: var(--ink-soft);
}

/* ---------- 대문 hero ---------- */

.hero {
  padding-block: clamp(3.5rem, 9vw, 6.5rem) clamp(3rem, 7vw, 5rem);
}
.hero h1 {
  font-size: clamp(2.9rem, 10vw, 5.9rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.04;
  margin-top: 1.1rem;
}
.hero h1 .now-word {
  border-bottom: 3px solid var(--now);
  padding-bottom: 0.04em;
}
.hero .sub {
  margin-top: 1.4rem;
  font-size: clamp(1.15rem, 2.6vw, 1.4rem);
  font-weight: 500;
  letter-spacing: -0.01em;
}
.hero .sub-en {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: clamp(0.95rem, 2vw, 1.05rem);
  margin-top: 0.35rem;
}
.hero .descriptor {
  max-width: 43rem;
  margin-top: 2rem;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

/* ---------- 서명 장치: 깊은 시간 막대 ---------- */

.deep-time { margin-top: clamp(2.75rem, 6vw, 4rem); }
.dt-bar {
  display: flex;
  align-items: stretch;
  height: 14px;
}
.dt-seg.s1 { flex: 70 1 0; background: var(--strata-1); }
.dt-seg.s2 { flex: 22 1 0; background: var(--strata-2); }
.dt-seg.s3 { flex: 7 1 0;  background: var(--strata-3); }
.dt-now    { flex: 0 0 3px; background: var(--now); margin-left: 2px; }
.dt-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
  margin-top: 0.8rem;
  font-size: 0.8rem;
  color: var(--ink-soft);
}
.dt-legend .k {
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  margin-right: 0.4em;
}
.dt-legend .k.s1 { background: var(--strata-1); }
.dt-legend .k.s2 { background: var(--strata-2); }
.dt-legend .k.s3 { background: var(--strata-3); }
.dt-legend .k.now { background: var(--now); }
.deep-time figcaption {
  margin-top: 0.9rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
  max-width: 43rem;
}

/* 주제 페이지 미니 서명: 잉크 선 끝의 붉은 눈금 */
.now-rule {
  position: relative;
  height: 2px;
  max-width: 11rem;
  background: var(--ink);
  margin-top: 2rem;
}
.now-rule::after {
  content: "";
  position: absolute;
  right: -16px;
  top: 0;
  width: 10px;
  height: 2px;
  background: var(--now);
}

/* ---------- 섹션 공통 ---------- */

section, .section {
  margin-top: clamp(3.5rem, 8vw, 5.5rem);
}
.section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  border-top: 1px solid var(--ink);
  padding-top: 1rem;
}
.section-head h2 {
  font-size: 1.6rem;
  font-weight: 750;
  letter-spacing: -0.02em;
}
.section-head .eyebrow { margin-left: auto; text-align: right; }
.section-lead {
  margin-top: 1rem;
  max-width: 43rem;
  color: var(--ink-soft);
}

/* ---------- 서사 아크 (대문) ---------- */

.arc { list-style: none; margin-top: 2rem; }
.arc li {
  border-top: 1px solid var(--hairline);
  padding-block: 1.5rem;
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0.4rem 1.25rem;
}
.arc .arc-no {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--ink-soft);
  line-height: 2;
}
.arc h3 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.015em;
}
.arc h3 .arc-key { color: var(--ink-soft); font-weight: 500; }
.arc p {
  grid-column: 2;
  max-width: 40rem;
  font-size: 0.98rem;
  color: var(--ink-soft);
  margin-top: 0.15rem;
}

/* ---------- 주제 카드 (대문) ---------- */

.cards { list-style: none; margin-top: 2rem; }
.cards li { border-top: 1px solid var(--hairline); }
.cards li:last-child { border-bottom: 1px solid var(--hairline); }
.cards a {
  display: grid;
  grid-template-columns: 3rem 1fr auto;
  align-items: baseline;
  gap: 0.2rem 1.25rem;
  padding-block: 1.35rem;
  text-decoration: none;
}
.cards .card-no {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 1rem;
}
.cards .card-title {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  font-weight: 750;
  letter-spacing: -0.02em;
}
.cards .card-line {
  grid-column: 2;
  font-size: 0.95rem;
  color: var(--ink-soft);
}
.cards .card-arrow {
  grid-row: 1;
  grid-column: 3;
  color: var(--ink-soft);
  transition: transform 0.18s ease;
}
.cards a:hover .card-title { box-shadow: inset 0 -2px 0 var(--now); }
.cards a:hover .card-arrow { transform: translateX(5px); color: var(--now); }

.cluster-h {
  margin-top: 2.6rem;
  font-size: 0.92rem;
  font-weight: 650;
  letter-spacing: 0.07em;
  color: var(--ink-soft);
}
.cluster-h .cluster-en {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  margin-left: 0.5rem;
  letter-spacing: 0;
}

/* ---------- 소개 (대문) ---------- */

.about-grid {
  margin-top: 1.5rem;
  display: grid;
  gap: 2rem;
}
.about-grid > p { max-width: 43rem; }
.fact-list { list-style: none; }
.fact-list li {
  border-top: 1px solid var(--hairline);
  padding-block: 0.7rem;
  font-size: 0.97rem;
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1rem;
}
.fact-list .fact-k {
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 2.2;
}

/* ---------- 주제 페이지 ---------- */

.page-hero {
  padding-top: clamp(2.75rem, 7vw, 4.5rem);
}
.page-hero h1 {
  font-size: clamp(2.1rem, 6.5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  margin-top: 1rem;
  max-width: 46rem;
}
.byline {
  margin-top: 1.4rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
}
.byline .sep { margin-inline: 0.45rem; color: var(--hairline); }
.lead {
  margin-top: 1.6rem;
  max-width: 43rem;
  font-size: 1.18rem;
  line-height: 1.8;
  font-weight: 450;
  letter-spacing: -0.005em;
}

.prose { max-width: 43rem; }

.qa {
  max-width: 43rem;
  border-top: 1px solid var(--hairline);
  padding-top: 1.6rem;
  margin-top: clamp(2.75rem, 6vw, 3.75rem);
}
.qa h2 {
  font-size: 1.38rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  line-height: 1.4;
}
.qa .answer {
  margin-top: 1rem;
  font-weight: 550;
  line-height: 1.8;
}
.qa p + p { margin-top: 1rem; }
.qa p:not(.answer) { color: #3E3931; }

/* ---------- 저자 상자 ---------- */

.author {
  max-width: 43rem;
  margin-top: clamp(3.5rem, 8vw, 5rem);
  background: var(--paper-deep);
  padding: 1.75rem clamp(1.25rem, 4vw, 2rem);
}
.author h2 {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.17em;
  color: var(--ink-soft);
}
.author .author-name {
  margin-top: 0.8rem;
  font-size: 1.3rem;
  font-weight: 750;
  letter-spacing: -0.02em;
}
.author .author-en {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-left: 0.5rem;
}
.author p + p { margin-top: 0.8rem; }
.author .author-bio { font-size: 0.97rem; color: #3E3931; }
.author .author-home { font-size: 0.92rem; }

/* ---------- 관련 노트 ---------- */

.related { max-width: 43rem; margin-top: clamp(3rem, 7vw, 4rem); }
.related h2 {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.17em;
  color: var(--ink-soft);
}
.related ul { list-style: none; margin-top: 0.9rem; }
.related li { border-top: 1px solid var(--hairline); }
.related a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding-block: 0.85rem;
  text-decoration: none;
}
.related .rel-no {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.related .rel-title { font-weight: 650; }
.related .rel-line {
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--ink-soft);
  text-align: right;
}
.related a:hover .rel-title { box-shadow: inset 0 -2px 0 var(--now); }

/* ---------- 발 ---------- */

.site-foot {
  margin-top: clamp(4.5rem, 10vw, 7rem);
  border-top: 1px solid var(--ink);
}
.site-foot .wrap { padding-block: 2.25rem 2.75rem; }
.foot-id { font-weight: 650; font-size: 0.95rem; }
.foot-note {
  margin-top: 0.8rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
  max-width: 43rem;
}
.foot-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1.2rem;
  margin-top: 1.4rem;
  font-size: 0.85rem;
}
.foot-nav a { color: var(--ink-soft); text-decoration: none; }
.foot-nav a:hover { color: var(--ink); text-decoration: underline; }
.foot-copy {
  margin-top: 1.4rem;
  font-size: 0.82rem;
  color: var(--ink-soft);
}
.foot-copy .foot-en {
  font-family: var(--serif);
  font-style: italic;
}

/* ---------- 404 ---------- */

.lost {
  padding-block: clamp(4rem, 12vw, 8rem);
  max-width: 43rem;
}
.lost h1 {
  font-size: clamp(2.2rem, 7vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
}
.lost p { margin-top: 1.25rem; color: var(--ink-soft); }
.lost ul { list-style: none; margin-top: 1.75rem; }
.lost li { border-top: 1px solid var(--hairline); }
.lost li a {
  display: block;
  padding-block: 0.8rem;
  text-decoration: none;
  font-weight: 600;
}
.lost li a:hover { box-shadow: inset 0 -2px 0 var(--now); }

/* ---------- 등장 모션 (절제) ---------- */

@media (prefers-reduced-motion: no-preference) {
  .rise {
    animation: rise 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
  }
  .rise.r2 { animation-delay: 0.1s; }
  .rise.r3 { animation-delay: 0.2s; }
  @keyframes rise {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: none; }
  }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cards .card-arrow { transition: none; }
}

/* ---------- 좁은 화면 ---------- */

@media (max-width: 40rem) {
  .arc li, .cards a { grid-template-columns: 2.2rem 1fr auto; }
  .fact-list li { grid-template-columns: 1fr; gap: 0; }
  .fact-list .fact-k { line-height: 1.6; }
  .related .rel-line { display: none; }
  .section-head { flex-wrap: wrap; }
  .section-head .eyebrow { margin-left: 0; text-align: left; }
}

/* ============================================================
   절 안의 하위 묶음 — 논문 목록·프로필 (2026-08-19 신설)
   ⚠ `.section > h3` 로 쓰면 index 의 `.cluster-h`(같은 위치)와 충돌한다.
      그래서 전용 클래스로 어휘를 만든다.
   ============================================================ */
.sub-h {
  font-size: 0.92rem;
  font-weight: 650;
  letter-spacing: 0.07em;
  line-height: 1.5;
  margin: 2.6rem 0 0.9rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--hairline);
  max-width: 43rem;
}
.sub-h + .fact-list { max-width: 43rem; }
.sub-h + .fact-list + .prose { margin-top: 1.4rem; }

/* 긴 URL·DOI 가 들어와도 grid 트랙을 밀지 않게 (min-content 축소) */
.fact-list li > span:last-child { min-width: 0; overflow-wrap: anywhere; }

/* 줄바꿈 금지 — 날짜가 하이픈에서 쪼개지는 것을 막는다 */
.nw { white-space: nowrap; }

/* 404 제목 간격을 다른 페이지의 .page-hero h1 과 맞춘다 */
.lost h1 { margin-top: 1rem; }

/* 푸터 내비 터치 타깃 — "홈" 이 11.8×25.1px 였다 */
.foot-nav a {
  display: inline-block;
  padding: 0.32rem 0.45rem;
  margin: 0 -0.45rem;
}

/* N-4 — .about-grid 안 fact-list 도 .prose(43rem) 와 측정선을 맞춘다 */
.about-grid .fact-list { max-width: 43rem; }

/* N-3 — 두 음절 고아 줄 완화 (미지원 브라우저는 무시) */
.prose, .fact-list li > span:last-child, .byline { text-wrap: pretty; }