/* ═══════════════════════════════════════════════════════════
   2411 PAPER_FORMAT — "원고지" 에디토리얼 변형
   출발점: 2801_DesignKit/kit-editorial (세리프 헤드라인·hairline·각진 모서리)
   변형: 종이 톤 바탕 · 좌측 여백 괘선(원고 여백) · 단색 액센트(oxblood) · 스몰캡 라벨
        · 참고문헌 내어쓰기 미리보기 · 그림자/그라디언트/블러/글로우 없음
   ═══════════════════════════════════════════════════════════ */
:root {
  --paper: #fbfaf6;
  --sheet: #ffffff;
  --ink: #1d1c1a;
  --ink-2: #4a4843;
  --ink-3: #7a766e;
  --rule: #d9d5cc;
  --rule-2: #ebe8e1;
  --tint: #f4f1ea;
  --accent: #8c2f39;          /* oxblood 단색 액센트 */
  --accent-ink: #ffffff;
  --accent-soft: #f5e9ea;
  --ok: #2f5d3a;
  --serif: 'Noto Serif KR', 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans: 'IBM Plex Sans KR', 'Apple SD Gothic Neo', 'Malgun Gothic', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --r: 2px;
  --wrap: 1180px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --paper: #161513;
  --sheet: #1d1c19;
  --ink: #ebe7df;
  --ink-2: #c3beb3;
  --ink-3: #8f8a80;
  --rule: #3a3833;
  --rule-2: #2a2926;
  --tint: #22211e;
  --accent: #d98b93;
  --accent-ink: #1a1112;
  --accent-soft: #33221f;
  --ok: #8fc79c;
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #161513; --sheet: #1d1c19; --ink: #ebe7df; --ink-2: #c3beb3; --ink-3: #8f8a80;
    --rule: #3a3833; --rule-2: #2a2926; --tint: #22211e; --accent: #d98b93; --accent-ink: #1a1112;
    --accent-soft: #33221f; --ok: #8fc79c; color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 15px/1.65 var(--sans); -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 28px; } }

/* ── 헤더 ─────────────────────────────── */
.site-header { background: var(--paper); border-bottom: 1px solid var(--ink); position: sticky; top: 0; z-index: 40; }
.hd { display: flex; align-items: center; gap: 14px; min-height: 58px; }
.brand { display: inline-flex; align-items: baseline; gap: 8px; text-decoration: none; color: var(--ink); flex-shrink: 0; }
.brand-mark { font-family: var(--serif); font-weight: 700; font-size: 19px; letter-spacing: -0.01em; }
.brand-mark em { font-style: normal; color: var(--accent); }
.brand-sub { font-size: 10.5px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3); display: none; }
@media (min-width: 900px) { .brand-sub { display: inline; } }
.nav { display: none; gap: 2px; margin-left: auto; }
.nav a { color: var(--ink-2); text-decoration: none; font-size: 14px; padding: 6px 10px; border-bottom: 2px solid transparent; }
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }
@media (min-width: 1000px) { .nav { display: flex; } }
.hd-tools { display: flex; align-items: center; gap: 6px; margin-left: auto; }
@media (min-width: 1000px) { .hd-tools { margin-left: 8px; } }
.lang-link, .icon-btn {
  display: inline-flex; align-items: center; justify-content: center; height: 34px; min-width: 34px; padding: 0 9px;
  border: 1px solid var(--rule); background: var(--sheet); border-radius: var(--r); color: var(--ink-2);
  text-decoration: none; font-size: 12.5px; cursor: pointer; letter-spacing: 0.04em;
}
.lang-link:hover, .icon-btn:hover { border-color: var(--ink); color: var(--ink); }
.icon-btn svg { width: 17px; height: 17px; }
.menu-btn { display: inline-flex; }
@media (min-width: 1000px) { .menu-btn { display: none; } }
.mnav { border-top: 1px solid var(--rule); padding: 8px 0 14px; display: grid; grid-template-columns: 1fr 1fr; gap: 2px 12px; }
.mnav a { color: var(--ink); text-decoration: none; padding: 8px 2px; border-bottom: 1px solid var(--rule-2); font-size: 14.5px; }
@media (min-width: 1000px) { .mnav { display: none !important; } }

/* ── 공통 제목·라벨 ────────────────────── */
.kicker { font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink-3); font-weight: 600; }
.page-head { padding: 34px 0 18px; border-bottom: 1px solid var(--rule); margin-bottom: 26px; }
.page-head h1 { font-family: var(--serif); font-size: clamp(26px, 4.4vw, 38px); line-height: 1.22; margin: 8px 0 10px; letter-spacing: -0.012em; font-weight: 700; }
.page-head p { color: var(--ink-2); margin: 0; max-width: 70ch; }
.basis { display: inline-block; margin-top: 12px; font-size: 12.5px; color: var(--ink-2); border-left: 2px solid var(--accent); padding: 2px 0 2px 10px; }
.tool-title { display: flex; align-items: baseline; gap: 12px; padding: 20px 0 14px; }
.tool-title h1 { font-family: var(--serif); font-size: 21px; margin: 0; font-weight: 700; }
.tool-title span { color: var(--ink-3); font-size: 13px; }

/* ── 도구 레이아웃 ─────────────────────── */
.tool-grid { display: grid; gap: 22px; grid-template-columns: 1fr; align-items: start; }
@media (min-width: 980px) { .tool-grid { grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); gap: 28px; } }
.panel { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r); }
.panel-hd { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 16px; border-bottom: 1px solid var(--rule); }
.panel-hd h2 { font-size: 13px; letter-spacing: 0.16em; text-transform: uppercase; margin: 0; color: var(--ink-2); font-weight: 600; }
.panel-bd { padding: 16px; }
@media (min-width: 720px) { .panel-bd { padding: 18px 20px; } }
.sticky-col { position: static; }
@media (min-width: 980px) { .sticky-col { position: sticky; top: 76px; } }

/* 유형 탭 — 밑줄형 */
.tabs { display: flex; flex-wrap: nowrap; gap: 0; border-bottom: 1px solid var(--rule); margin: -4px 0 16px; overflow-x: auto; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tab { flex: 0 0 auto; white-space: nowrap; background: none; border: 0; border-bottom: 2px solid transparent; padding: 8px 9px; margin-bottom: -1px; cursor: pointer; color: var(--ink-2); font-size: 14px; }
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); font-weight: 600; }

/* DOI 바 */
.doi-bar { display: flex; gap: 8px; margin-bottom: 16px; }
.doi-bar input { flex: 1; min-width: 0; }
.doi-msg { font-size: 13px; margin: -8px 0 14px; color: var(--ink-2); min-height: 0; }
.doi-msg.err { color: var(--accent); }
.doi-msg.ok { color: var(--ok); }

/* 폼 */
.fields { display: grid; gap: 12px 14px; grid-template-columns: 1fr 1fr; }
.f { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.f.full { grid-column: 1 / -1; }
.f > label, .f > .lbl { font-size: 12.5px; color: var(--ink-2); font-weight: 500; }
.f .opt { color: var(--ink-3); font-weight: 400; }
.in, .sel, textarea.in {
  width: 100%; border: 1px solid var(--rule); background: var(--paper); border-radius: var(--r);
  padding: 9px 10px; font-size: 14.5px; min-height: 40px;
}
.in:focus, .sel:focus { border-color: var(--ink); outline: none; box-shadow: inset 0 -2px 0 var(--accent); }
textarea.in { min-height: 120px; resize: vertical; line-height: 1.5; }
textarea.mono, .mono { font-family: var(--mono); font-size: 13px; }
.sel { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%237a766e' stroke-width='1.4'/%3E%3C/svg%3E");
  background-position: calc(100% - 11px) 50%; background-repeat: no-repeat; padding-right: 30px; }
.row3 { display: grid; grid-template-columns: 1.2fr 0.8fr 0.8fr; gap: 8px; }

/* 저자 행 */
.people { display: flex; flex-direction: column; gap: 8px; }
.person { display: grid; grid-template-columns: 22px 1fr 1fr auto auto; gap: 6px; align-items: center; }
.person .num { font-family: var(--serif); color: var(--ink-3); font-size: 13px; text-align: right; }
.person.lit .given { display: none; }
.person.lit .family { grid-column: span 2; }
.chk { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; color: var(--ink-2); white-space: nowrap; cursor: pointer; }
.chk input { accent-color: var(--accent); }
.x-btn { border: 1px solid var(--rule); background: none; width: 30px; height: 30px; border-radius: var(--r); cursor: pointer; color: var(--ink-3); }
.x-btn:hover { color: var(--accent); border-color: var(--accent); }
.people-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 2px; }
@media (max-width: 480px) {
  .person { grid-template-columns: 18px 1fr 1fr 30px; }
  .person .chk { grid-column: 2 / 4; grid-row: 2; }
  .person .x-btn { grid-column: 4; grid-row: 1; }
}

/* 버튼 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 38px; padding: 0 14px; border-radius: var(--r);
  border: 1px solid var(--ink); background: var(--ink); color: var(--paper); cursor: pointer; font-size: 14px; font-weight: 500; text-decoration: none; white-space: nowrap; }
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--rule); }
.btn.ghost:hover { border-color: var(--ink); background: transparent; color: var(--ink); }
.btn.sm { min-height: 32px; padding: 0 10px; font-size: 13px; }
.btn.link { border: 0; background: none; color: var(--accent); padding: 0 4px; min-height: 28px; }
.btn.link:hover { text-decoration: underline; background: none; color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--rule-2); }
.actions .spacer { flex: 1; }

/* 스타일 선택 */
.style-pick { display: flex; gap: 8px; align-items: center; }
.style-pick .sel { flex: 1; min-width: 0; font-weight: 500; }

/* 참고문헌 출력 — 원고 느낌 */
.ref-out { font-family: var(--serif); font-size: 15.5px; line-height: 1.75; padding-left: 2.2em; text-indent: -2.2em; word-break: break-word; overflow-wrap: anywhere; min-height: 3.5em; }
.ref-out.empty { color: var(--ink-3); font-family: var(--sans); font-size: 14px; text-indent: 0; padding-left: 0; }
.ref-out i { font-style: italic; }
.cite-rows { margin-top: 14px; border-top: 1px dashed var(--rule); padding-top: 12px; display: grid; gap: 8px; }
.cite-row { display: grid; grid-template-columns: 88px 1fr auto; gap: 8px; align-items: baseline; }
.cite-row .k { font-size: 12px; color: var(--ink-3); letter-spacing: .04em; }
.cite-row .v { font-family: var(--serif); font-size: 15px; overflow-wrap: anywhere; }
.loc-in { display: flex; gap: 8px; align-items: center; margin-top: 12px; font-size: 13px; color: var(--ink-2); }
.loc-in .in { width: 120px; min-height: 34px; padding: 6px 8px; }
.opt-row { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 12px; font-size: 13px; color: var(--ink-2); }
.warn-list { margin: 12px 0 0; padding: 0; list-style: none; font-size: 12.5px; color: var(--ink-2); }
.warn-list li { padding-left: 14px; position: relative; }
.warn-list li::before { content: '—'; position: absolute; left: 0; color: var(--accent); }

/* 목록 */
.list-panel { margin-top: 28px; }
.list-tools { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.bib-list { list-style: none; margin: 0; padding: 0; counter-reset: none; }
.bib-item { display: grid; grid-template-columns: 1fr auto; gap: 10px; padding: 12px 0; border-bottom: 1px solid var(--rule-2); }
.bib-item:last-child { border-bottom: 0; }
.bib-item .ref-out { min-height: 0; }
.bib-item.editing { background: var(--accent-soft); margin: 0 -10px; padding: 12px 10px; }
.item-acts { display: flex; gap: 2px; align-items: flex-start; }
.item-acts button { border: 1px solid transparent; background: none; color: var(--ink-3); width: 30px; height: 30px; border-radius: var(--r); cursor: pointer; }
.item-acts button:hover { border-color: var(--rule); color: var(--ink); }
.item-acts svg { width: 15px; height: 15px; }
.list-empty { color: var(--ink-3); padding: 18px 0; font-size: 14px; }
.list-foot { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--rule); }
.count-badge { font-family: var(--serif); font-size: 13px; color: var(--ink-3); }

/* 체크리스트·보조 도구 */
.progress { height: 6px; background: var(--rule-2); border-radius: 1px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--accent); width: 0; transition: width .25s; }
.ck-group { border-top: 1px solid var(--ink); padding: 14px 0 6px; }
.ck-group h2 { font-family: var(--serif); font-size: 18px; margin: 0 0 8px; display: flex; justify-content: space-between; gap: 10px; }
.ck-group h2 small { font-family: var(--sans); font-size: 12px; color: var(--ink-3); font-weight: 400; }
.ck { display: grid; grid-template-columns: 22px 1fr; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--rule-2); cursor: pointer; }
.ck input { margin-top: 4px; accent-color: var(--accent); width: 16px; height: 16px; }
.ck .t { font-size: 14.5px; }
.ck .h { display: block; color: var(--ink-3); font-size: 12.5px; margin-top: 2px; }
.ck input:checked + span .t { color: var(--ink-3); text-decoration: line-through; text-decoration-color: var(--rule); }
.num-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.num-card { border: 1px solid var(--rule); background: var(--sheet); padding: 14px; border-radius: var(--r); }
.num-card h3 { font-size: 14px; margin: 0 0 8px; }
.num-card pre { margin: 0; font-family: var(--serif); font-size: 14px; line-height: 1.7; white-space: pre; overflow-x: auto; }
.tc-out { display: grid; gap: 10px; }
.tc-row { border: 1px solid var(--rule); background: var(--sheet); padding: 12px 14px; border-radius: var(--r); display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: start; }
.tc-row .lab { font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.tc-row .val { font-family: var(--serif); font-size: 16px; white-space: pre-wrap; overflow-wrap: anywhere; }
.tc-row.active { border-color: var(--ink); }

/* ── 본문(가이드) ─────────────────────── */
.doc { display: grid; gap: 34px; grid-template-columns: 1fr; }
@media (min-width: 1040px) { .doc { grid-template-columns: minmax(0, 1fr) 260px; } }
.prose { font-size: 16px; line-height: 1.85; max-width: 74ch; }
.prose h2 { font-family: var(--serif); font-size: 23px; line-height: 1.35; margin: 40px 0 12px; padding-top: 14px; border-top: 1px solid var(--rule); }
.prose h3 { font-size: 17px; margin: 26px 0 8px; }
.prose p { margin: 0 0 14px; }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 1.3em; }
.prose li { margin: 4px 0; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--tint); padding: 1px 5px; border-radius: 2px; }
.prose blockquote { margin: 18px 0; padding: 12px 16px; border-left: 3px solid var(--accent); background: var(--tint); font-size: 15px; }
.prose .ref-ex { font-family: var(--serif); font-size: 15px; line-height: 1.7; padding: 10px 14px 10px calc(14px + 2em); text-indent: -2em; background: var(--sheet); border: 1px solid var(--rule); margin: 8px 0; border-radius: var(--r); overflow-wrap: anywhere; }
.tbl-wrap { overflow-x: auto; margin: 14px 0 20px; border: 1px solid var(--rule); background: var(--sheet); }
.prose table, .ex-table { border-collapse: collapse; width: 100%; font-size: 14px; line-height: 1.55; }
.prose th, .prose td, .ex-table th, .ex-table td { border-bottom: 1px solid var(--rule-2); padding: 9px 12px; text-align: left; vertical-align: top; }
.prose th, .ex-table th { font-weight: 600; background: var(--tint); font-size: 13px; }
.ex-table td.ref { font-family: var(--serif); overflow-wrap: anywhere; }
.ex-table td.lab { white-space: nowrap; color: var(--ink-2); font-size: 13px; width: 1%; }
.toc { position: static; font-size: 13.5px; }
@media (min-width: 1040px) { .toc { position: sticky; top: 80px; } }
.toc h2 { font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 10px; }
.toc a { display: block; color: var(--ink-2); text-decoration: none; padding: 5px 0 5px 10px; border-left: 1px solid var(--rule); }
.toc a:hover { color: var(--ink); border-left-color: var(--accent); }
.meta-line { color: var(--ink-3); font-size: 13px; margin-top: 8px; }
.sources { font-size: 13.5px; }
.sources li { overflow-wrap: anywhere; }
.crumb { font-size: 13px; color: var(--ink-3); padding-top: 18px; }
.crumb a { color: var(--ink-2); text-decoration: none; }
.crumb a:hover { color: var(--accent); }
.crumb span.sep { margin: 0 6px; }

/* 허브 카드 */
.card-list { display: grid; grid-template-columns: 1fr; border-top: 1px solid var(--ink); }
@media (min-width: 720px) { .card-list { grid-template-columns: 1fr 1fr; } }
.card { display: block; padding: 18px 4px 18px 0; border-bottom: 1px solid var(--rule); text-decoration: none; color: var(--ink); }
@media (min-width: 720px) { .card:nth-child(odd) { padding-right: 24px; border-right: 1px solid var(--rule); } .card:nth-child(even) { padding-left: 24px; } }
.card h3 { font-family: var(--serif); font-size: 18px; margin: 0 0 6px; }
.card p { margin: 0; color: var(--ink-2); font-size: 14px; }
.card .no { font-family: var(--serif); color: var(--accent); font-size: 13px; }
.card:hover h3 { color: var(--accent); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 40px; border-top: 1px solid var(--ink); padding-top: 14px; }
.pager a { text-decoration: none; color: var(--ink-2); font-size: 13px; }
.pager a b { display: block; font-family: var(--serif); color: var(--ink); font-size: 15.5px; margin-top: 2px; }
.pager a.next { text-align: right; }

/* 광고 (§4-1 래퍼에 radius/overflow 금지) */
.ad-wrap { margin: 34px auto 0; }
.ad-grid { display: flex; flex-direction: column; align-items: center; gap: 14px; width: 100%; max-width: 672px; margin: 0 auto; }
.ad-grid[data-ad-layout="mixed"] { max-width: 780px; }
.ad-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; width: 100%; }
.ad-cell { max-width: 100%; }
.ad-row.ad-mo { display: none; }
.ad-row.ad-pc, .ad-row.ad-any { display: flex; }
@media (max-width: 719px) { .ad-row.ad-pc { display: none; } .ad-row.ad-mo { display: flex; } }

/* 푸터 */
.site-footer { margin-top: 64px; border-top: 1px solid var(--ink); padding: 26px 0 40px; font-size: 13.5px; color: var(--ink-2); }
.ft-cols { display: grid; gap: 20px; grid-template-columns: 1fr 1fr; }
@media (min-width: 820px) { .ft-cols { grid-template-columns: 1.3fr 1fr 1fr 1fr; } }
.ft-cols h2 { font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 8px; font-weight: 600; }
.ft-cols a { display: block; color: var(--ink-2); text-decoration: none; padding: 3px 0; }
.ft-cols a:hover { color: var(--accent); }
.ft-about { grid-column: 1 / -1; }
@media (min-width: 820px) { .ft-about { grid-column: auto; } }
.ft-about p { margin: 6px 0 0; max-width: 34ch; }
.ft-base { margin-top: 24px; padding-top: 14px; border-top: 1px solid var(--rule); font-size: 12.5px; color: var(--ink-3); }

/* 토스트 */
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px); background: var(--ink); color: var(--paper);
  padding: 10px 16px; border-radius: var(--r); font-size: 14px; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 80; max-width: calc(100% - 32px); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 인쇄 */
@media print {
  .site-header, .site-footer, .ad-wrap, .actions, .no-print, .toast { display: none !important; }
  body { background: #fff; color: #000; }
  .panel { border: 0; }
}

/* 모바일 보정 */
.tool-title { flex-wrap: wrap; row-gap: 2px; }
@media (max-width: 560px) {
  .tool-title { flex-direction: column; align-items: flex-start; }
  .bib-item { grid-template-columns: 1fr; gap: 4px; }
  .item-acts { justify-content: flex-end; }
  .ref-out { padding-left: 1.4em; text-indent: -1.4em; }
}
.tool-grid > *, .panel, .panel-bd, .fields, .doc > * { min-width: 0; }