/* ============================================================
   Reble 블로그 — "데이터 저널"
   웜 페이퍼 + 명조 헤드라인 + 크림슨 헤어라인.
   본문 폭 41rem(한글 약 38자), 행간 1.8 — 장문 독서 최적.
   ============================================================ */

:root {
  --bg: oklch(0.982 0.004 40);          /* 웜 페이퍼 */
  --bg-elev: oklch(0.958 0.006 40);
  --ink: oklch(0.245 0.012 30);
  --ink-2: oklch(0.51 0.014 30);
  --line: oklch(0.905 0.008 40);
  --accent: oklch(0.505 0.195 14);      /* 에디토리얼 크림슨 (AA) */
  --accent-hi: #ff003c;                 /* reble 브랜드 레드 — 비텍스트 마크 전용 */
  --code-bg: oklch(0.945 0.007 40);

  --serif: "Noto Serif KR", "Apple Myungjo", serif;
  --sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
          "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --folio: "Space Grotesk", var(--sans);
  --mono: ui-monospace, "SF Mono", "D2Coding", Menlo, monospace;

  --measure: 41rem;
  --wide: 71rem;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: oklch(0.205 0.008 30);          /* 웜 잉크 */
  --bg-elev: oklch(0.245 0.009 30);
  --ink: oklch(0.925 0.006 40);
  --ink-2: oklch(0.67 0.012 35);
  --line: oklch(0.32 0.01 30);
  --accent: oklch(0.68 0.19 14);
  --accent-hi: #ff2e55;
  --code-bg: oklch(0.255 0.009 30);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.8;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, color .25s ease;
}

::selection { background: color-mix(in oklab, var(--accent) 20%, transparent); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: .22em; }

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

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #fff; padding: .5rem 1rem; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- 진행바 (포스트) ---------- */
#progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: var(--accent-hi); z-index: 50;
}

/* ---------- 헤더 ---------- */
.site-header {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.4rem clamp(1.25rem, 4vw, 2.5rem) 1.2rem;
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  border-bottom: 1px solid var(--line);
}
.wordmark {
  font-family: var(--folio);
  font-weight: 600; font-size: 1.05rem; letter-spacing: .01em;
  color: var(--ink);
}
.wordmark:hover { text-decoration: none; }
.wordmark .tick { color: var(--accent-hi); }
.wordmark .k { font-family: var(--sans); font-weight: 600; color: var(--ink-2); margin-left: .45rem; font-size: .95rem; }
.site-nav { display: flex; align-items: baseline; gap: 1.1rem; font-size: .875rem; }
.site-nav a { color: var(--ink-2); }
.site-nav a:hover { color: var(--accent); }
#theme-btn {
  background: none; border: none; cursor: pointer;
  color: var(--ink-2); font-size: 1rem; padding: 0 .1rem; line-height: 1;
}
#theme-btn:hover { color: var(--ink); }

/* ---------- 제호 (인덱스) ---------- */
.masthead {
  max-width: var(--wide);
  margin: 0 auto;
  padding: clamp(2.5rem, 7vw, 4.5rem) clamp(1.25rem, 4vw, 2.5rem) 0;
}
.masthead::before {
  content: ""; display: block; width: 3.25rem; height: 4px;
  background: var(--accent-hi); margin-bottom: 1.5rem;
}
.masthead h1 {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(2rem, 5vw, 3rem); line-height: 1.2;
  letter-spacing: -.015em; margin: 0 0 .7rem;
}
.masthead p {
  margin: 0; color: var(--ink-2); font-size: 1.02rem; max-width: 34rem;
}

/* ---------- 피처드 (최신 글) ---------- */
.featured {
  max-width: var(--wide);
  margin: 0 auto;
  padding: clamp(2.2rem, 5vw, 3.5rem) clamp(1.25rem, 4vw, 2.5rem) 2.6rem;
  border-bottom: 1px solid var(--line);
}
.featured .folio { margin-bottom: .9rem; }
.featured h2 { margin: 0 0 .8rem; }
.featured h2 a {
  font-family: var(--serif); font-weight: 700; color: var(--ink);
  font-size: clamp(1.65rem, 4vw, 2.4rem); line-height: 1.3; letter-spacing: -.01em;
}
.featured h2 a:hover { text-decoration-color: var(--accent-hi); }
.featured .summary { color: var(--ink-2); max-width: 44rem; margin: 0 0 1.1rem; }
.featured .more { font-size: .92rem; font-weight: 600; }

/* ---------- 폴리오 라벨 ---------- */
.folio {
  font-family: var(--folio); font-size: .78rem; font-weight: 500;
  letter-spacing: .09em; text-transform: uppercase;
  color: var(--ink-2);
  display: flex; align-items: center; gap: .65rem; flex-wrap: wrap;
}
.folio .cat { color: var(--accent); font-weight: 600; }
.folio .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--line); }

/* ---------- 필터 + 검색 ---------- */
.toolbar {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.4rem clamp(1.25rem, 4vw, 2.5rem);
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}
.chips { display: flex; gap: .45rem; flex-wrap: wrap; }
.chip {
  font-family: var(--folio); font-size: .8rem; font-weight: 500;
  letter-spacing: .04em;
  border: 1px solid var(--line); border-radius: 999px;
  background: none; color: var(--ink-2);
  padding: .28rem .85rem; cursor: pointer;
  transition: border-color .15s ease, color .15s ease;
}
.chip:hover { border-color: var(--ink-2); color: var(--ink); }
.chip[aria-pressed="true"] {
  border-color: var(--accent); color: var(--accent); font-weight: 600;
}
#search {
  font-family: var(--sans); font-size: .92rem;
  background: none; border: none; border-bottom: 1px solid var(--line);
  color: var(--ink); padding: .35rem .1rem; width: min(15rem, 100%);
}
#search::placeholder { color: var(--ink-2); }
#search:focus { outline: none; border-bottom-color: var(--accent); }

/* ---------- 글 리스트 ---------- */
.post-list {
  max-width: var(--wide);
  margin: 0 auto 4rem;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
  list-style: none;
}
.post-list li {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 1.6rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}
.post-list .when {
  font-family: var(--folio); font-size: .8rem; letter-spacing: .05em;
  color: var(--ink-2); padding-top: .45rem;
  font-variant-numeric: tabular-nums;
}
.post-list .when .cat { display: block; color: var(--accent); font-weight: 600; margin-top: .25rem; }
.post-list h3 { margin: 0 0 .35rem; }
.post-list h3 a {
  font-family: var(--serif); font-weight: 600; color: var(--ink);
  font-size: 1.28rem; line-height: 1.45; letter-spacing: -.005em;
}
.post-list h3 a:hover { text-decoration-color: var(--accent-hi); }
.post-list .summary { margin: 0; color: var(--ink-2); font-size: .95rem; }
.empty-note { color: var(--ink-2); padding: 2.5rem 0; font-size: .95rem; }

@media (max-width: 640px) {
  .post-list li { grid-template-columns: 1fr; gap: .3rem; padding: 1.3rem 0; }
  .post-list .when { display: flex; gap: .7rem; padding-top: 0; }
  .post-list .when .cat { margin-top: 0; }
}

/* ---------- 포스트 페이지 ---------- */
.post-hero {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1.25rem, 4vw, 2rem) 0;
}
.post-hero .folio { margin-bottom: 1.1rem; }
.post-hero h1 {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(1.85rem, 4.5vw, 2.6rem); line-height: 1.32;
  letter-spacing: -.015em; margin: 0 0 1rem;
}
.post-hero .lead {
  color: var(--ink-2); font-size: 1.12rem; line-height: 1.75; margin: 0 0 1.6rem;
}
.post-hero .byline {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding-bottom: 1.4rem; border-bottom: 2px solid var(--ink);
}
.post-hero .byline .folio { margin: 0; }
#copy-link {
  font-family: var(--folio); font-size: .78rem; letter-spacing: .05em;
  background: none; border: 1px solid var(--line); border-radius: 999px;
  color: var(--ink-2); padding: .3rem .9rem; cursor: pointer; white-space: nowrap;
}
#copy-link:hover { border-color: var(--accent); color: var(--accent); }

.layout {
  max-width: var(--wide); margin: 0 auto;
  display: grid; grid-template-columns: 1fr; justify-items: center;
}
@media (min-width: 1200px) {
  .layout.has-toc { grid-template-columns: minmax(0,1fr) 15rem; gap: 3rem;
    padding-right: clamp(1.25rem, 3vw, 2.5rem); }
}

/* ---------- 목차 ---------- */
.toc-aside { display: none; }
@media (min-width: 1200px) {
  .toc-aside { display: block; padding-top: 3.2rem; }
  .toc-aside .inner { position: sticky; top: 3.5rem; }
}
.toc-title {
  font-family: var(--folio); font-size: .74rem; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2);
  margin: 0 0 .7rem;
}
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc ul ul { padding-left: .9rem; }
.toc a {
  display: block; color: var(--ink-2); font-size: .85rem; line-height: 1.5;
  padding: .22rem 0 .22rem .8rem; border-left: 2px solid var(--line);
}
.toc a:hover { color: var(--ink); text-decoration: none; border-left-color: var(--ink-2); }
.toc a.active { color: var(--accent); border-left-color: var(--accent-hi); font-weight: 600; }
details.toc-mobile {
  max-width: var(--measure); width: 100%;
  margin: 1.6rem auto 0; padding: 0 clamp(1.25rem, 4vw, 2rem);
}
@media (min-width: 1200px) { details.toc-mobile { display: none; } }
details.toc-mobile summary {
  cursor: pointer; font-family: var(--folio); font-size: .8rem;
  letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2);
}
details.toc-mobile .toc { padding: .6rem 0 0; }

/* ---------- 본문 타이포그래피 ---------- */
.prose {
  max-width: var(--measure); width: 100%;
  padding: 1rem clamp(1.25rem, 4vw, 2rem) 3rem;
}
.prose > * { margin: 0 0 1.25rem; }
.prose h2 {
  font-family: var(--serif); font-weight: 700; font-size: 1.5rem;
  line-height: 1.4; letter-spacing: -.01em;
  margin: 2.8rem 0 1rem; scroll-margin-top: 2.5rem;
}
.prose h3 {
  font-family: var(--serif); font-weight: 600; font-size: 1.2rem;
  line-height: 1.45; margin: 2.1rem 0 .8rem; scroll-margin-top: 2.5rem;
}
.prose ul, .prose ol { padding-left: 1.35rem; }
.prose li { margin-bottom: .4rem; }
.prose li::marker { color: var(--accent); }
.prose blockquote {
  margin: 1.8rem 0; padding: .2rem 0 .2rem 1.3rem;
  border-left: 2px solid var(--accent-hi);
  font-family: var(--serif); color: var(--ink-2); font-size: 1.05rem;
}
.prose blockquote p { margin: 0 0 .5rem; }
.prose hr {
  border: none; height: auto; margin: 2.6rem 0; text-align: center;
}
.prose hr::before {
  content: "◆"; color: var(--accent-hi); font-size: .55rem; letter-spacing: 1.2em;
}
.prose img { max-width: 100%; height: auto; border-radius: 4px; }
.prose figcaption, .prose .caption {
  font-size: .85rem; color: var(--ink-2); margin-top: .5rem;
}
.prose code {
  font-family: var(--mono); font-size: .86em;
  background: var(--code-bg); border-radius: 4px; padding: .12em .4em;
}
.prose pre {
  background: var(--code-bg); border: 1px solid var(--line); border-radius: 6px;
  padding: 1rem 1.2rem; overflow-x: auto; line-height: 1.6; font-size: .86rem;
}
.prose pre code { background: none; padding: 0; font-size: 1em; }
.prose table {
  width: 100%; border-collapse: collapse; font-size: .93rem;
  display: block; overflow-x: auto;
}
.prose th, .prose td {
  text-align: left; padding: .55rem .8rem; border-bottom: 1px solid var(--line);
  font-variant-numeric: tabular-nums;
}
.prose th {
  font-family: var(--folio); font-size: .8rem; font-weight: 600;
  letter-spacing: .05em; color: var(--ink-2);
  border-bottom: 2px solid var(--ink);
}
.prose a { text-decoration: underline; text-underline-offset: .22em; text-decoration-thickness: 1px; }
.prose .footnote { font-size: .88rem; color: var(--ink-2); border-top: 1px solid var(--line); margin-top: 2.5rem; padding-top: 1rem; }
.prose sup a { text-decoration: none; font-weight: 600; }

/* ---------- 포스트 푸터: 이전/다음, 더 읽기 ---------- */
.post-end {
  max-width: var(--measure); margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2rem) 3rem;
}
.post-end::before {
  content: ""; display: block; width: 3.25rem; height: 4px;
  background: var(--accent-hi); margin-bottom: 2rem;
}
.pn {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; margin-bottom: 2.6rem;
}
.pn a {
  display: block; padding: 1rem 1.1rem; border: 1px solid var(--line); border-radius: 6px;
  color: var(--ink);
}
.pn a:hover { text-decoration: none; border-color: var(--accent); }
.pn .dir {
  font-family: var(--folio); font-size: .72rem; letter-spacing: .09em;
  text-transform: uppercase; color: var(--ink-2); display: block; margin-bottom: .3rem;
}
.pn .t { font-family: var(--serif); font-weight: 600; font-size: .98rem; line-height: 1.5; }
.pn .next { text-align: right; }
@media (max-width: 560px) { .pn { grid-template-columns: 1fr; } .pn .next { text-align: left; } }

.related h2 {
  font-family: var(--folio); font-size: .78rem; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2);
  margin: 0 0 .6rem;
}
.related ul { list-style: none; margin: 0; padding: 0; }
.related li { padding: .8rem 0; border-bottom: 1px solid var(--line); }
.related a { font-family: var(--serif); font-weight: 600; color: var(--ink); font-size: 1.02rem; }
.related .folio { margin-top: .25rem; }

/* ---------- 사이트 푸터 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
}
.site-footer .inner {
  max-width: var(--wide); margin: 0 auto;
  padding: 2rem clamp(1.25rem, 4vw, 2.5rem) 2.6rem;
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 1rem; flex-wrap: wrap;
  font-size: .85rem; color: var(--ink-2);
}
.site-footer .brand { font-family: var(--folio); letter-spacing: .08em; font-size: .78rem; text-transform: uppercase; }
.site-footer nav { display: flex; gap: 1.1rem; }
.site-footer a { color: var(--ink-2); }
.site-footer a:hover { color: var(--accent); }

/* ---------- 인쇄 ---------- */
@media print {
  .site-header, .site-footer, .toolbar, #progress, .toc-aside,
  details.toc-mobile, .pn, .related, #copy-link { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .prose a { color: #000; }
}