:root {
  --ink: #f5f1e8;
  --muted: #aaa9b5;
  --dim: #747485;
  --void: #09090e;
  --panel: #111119;
  --panel-2: #171721;
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.22);
  --electric: #9fa9ff;
  --cyan: #79d9df;
  --acid: #c8ef83;
  --gold: #f0c674;
  --rose: #f29aa4;
  --serif: Georgia, "Times New Roman", "Noto Serif KR", "Noto Serif KR", "Nanum Myeongjo", AppleMyungjo, Batang, serif;
  --sans: Inter, "Pretendard Variable", Pretendard, "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --shell: min(1220px, calc(100vw - 64px));
  --radius: 22px;
}

/* 버튼·입력창은 body 글꼴을 물려받지 않는다(브라우저 기본 글꼴을 쓴다).
   이것 때문에 목차·설정 버튼만 시스템 글꼴로 그려지고 있었다 — 실측으로 잡았다. */
button, input, select, textarea { font-family: inherit; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--void); }
body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 84% 6%, rgba(92, 104, 220, 0.16), transparent 25rem),
    radial-gradient(circle at 12% 36%, rgba(73, 151, 157, 0.08), transparent 25rem),
    var(--void);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
  word-break: keep-all;
  overflow-x: hidden;
}

button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration-color: rgba(159, 169, 255, 0.55); text-underline-offset: 4px; }
button { color: inherit; }
img, svg { display: block; max-width: 100%; }
::selection { background: var(--electric); color: #09090e; }

:focus-visible { outline: 3px solid var(--acid); outline-offset: 4px; }

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  background: var(--acid);
  color: #09090e;
  transform: translateY(-160%);
}
.skip-link:focus { transform: none; }

.reading-progress { position: fixed; z-index: 120; inset: 0 0 auto; height: 3px; background: transparent; }
.reading-progress span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--acid), var(--cyan), var(--electric)); }

.site-header {
  position: fixed;
  z-index: 100;
  inset: 3px 0 auto;
  height: 68px;
  border-bottom: 1px solid transparent;
  transition: background 180ms ease, border-color 180ms ease, backdrop-filter 180ms ease;
}
.site-header.scrolled { background: rgba(9, 9, 14, 0.82); border-color: var(--line); backdrop-filter: blur(18px); }
.header-inner { width: var(--shell); height: 100%; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
/* 브랜드 마크 — 원장의 두 칸(자산·부채)이 맞물린 형태 */
.brand-mark { position: relative; width: 28px; height: 28px; border: 1px solid var(--electric); border-radius: 6px; }
.brand-mark::before { content: ""; position: absolute; inset: 5px 13px 5px 5px; background: var(--acid); }
.brand-mark::after { content: ""; position: absolute; inset: 11px 5px 5px 15px; background: var(--rose); }
.brand strong { font: 700 14px/1 var(--mono); letter-spacing: 0.16em; }
.brand small { display: block; margin-top: 5px; color: var(--dim); font: 14px/1 var(--mono); letter-spacing: .1em; }
.primary-nav { display: flex; align-items: center; gap: 24px; }
.primary-nav a { position: relative; color: var(--muted); font-size: 14.5px; text-decoration: none; }
.primary-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 1px; background: var(--acid); transition: right 160ms ease; }
.primary-nav a:hover, .primary-nav a.active { color: var(--ink); }
.primary-nav a.active::after { right: 0; }
.home-link { color: var(--dim); font: 14px/1 var(--mono); letter-spacing: .08em; text-decoration: none; }
/* 아이콘은 인라인 SVG 만 — 이모지는 OS 마다 모양·기준선이 달라 정렬이 깨진다 */
.primary-nav a.nav-book { display: inline-flex; align-items: center; gap: 6px; color: var(--gold); }
.primary-nav a.nav-book svg, .button-ghost svg { width: 16px; height: 16px; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.mobile-menu { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 50%; background: transparent; }
.mobile-menu span { display: block; width: 16px; height: 1px; margin: 5px auto; background: var(--ink); }
.mobile-nav { position: fixed; z-index: 95; inset: 71px 16px auto; padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: rgba(17, 17, 25, .98); }
.mobile-nav a { display: block; padding: 12px; text-decoration: none; border-bottom: 1px solid var(--line); }
.mobile-nav a:last-child { border: 0; }

.section-shell { width: var(--shell); margin-inline: auto; }
.section-anchor { scroll-margin-top: 92px; }
.section { padding: 118px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(240px, .55fr); gap: 80px; align-items: end; margin-bottom: 48px; }
.section-heading h2 { margin: 12px 0 0; font: 400 clamp(36px, 5vw, 70px)/1.04 var(--serif); letter-spacing: -.045em; }
.section-heading h2 em { color: var(--electric); font-weight: 400; }
.section-heading > p { margin: 0; color: var(--muted); font-size: 15px; }
.section-heading--sub { margin-top: 96px; }
.section-heading--sub h2 { font-size: clamp(30px, 4vw, 52px); }
.kicker, .section-number { margin: 0; color: var(--acid); font: 700 14px/1.2 var(--mono); letter-spacing: .17em; text-transform: uppercase; }
.section-number { color: var(--dim); margin-bottom: 18px; }

.hero { min-height: 100svh; padding: 126px 0 72px; display: flex; align-items: center; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(380px, .95fr); gap: clamp(46px, 8vw, 120px); align-items: center; }
.hero-copy .kicker { color: var(--cyan); }
.hero-copy h1 { margin: 22px 0 24px; max-width: 760px; font: 400 clamp(62px, 9vw, 130px)/.82 var(--serif); letter-spacing: -.075em; }
.hero-copy h1 span { display: block; }
.hero-copy h1 em { display: block; color: var(--electric); font-size: .42em; line-height: 1.25; letter-spacing: -.04em; font-weight: 400; margin: 18px 0 0 7px; }
.hero-lead { max-width: 680px; margin: 0; color: #d2d0d4; font-size: clamp(17px, 2vw, 21px); line-height: 1.75; }
.hero-lead strong { color: var(--acid); font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button-primary, .button-ghost {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 19px;
  border: 1px solid var(--electric); border-radius: 999px;
  background: var(--electric); color: #09090e;
  font-size: 14.5px; font-weight: 700; text-decoration: none; cursor: pointer;
}
.button-ghost { background: transparent; border-color: var(--line-strong); color: var(--ink); }
.button-ghost:hover { border-color: var(--electric); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 40px; }
.hero-meta div { padding-left: 14px; border-left: 1px solid var(--line-strong); }
.hero-meta strong { display: block; font: 500 25px/1 var(--serif); }
.hero-meta span { color: var(--dim); font: 14px/1 var(--mono); letter-spacing: .09em; }

/* 히어로 그래픽 — 대출 실행 순간의 T 계정. 주제(돈과 빚이 함께 생긴다)를 한 장으로 */
.ledger-visual {
  position: relative;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background:
    linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px),
    radial-gradient(circle at 70% 12%, rgba(159,169,255,.18), transparent 42%),
    #0e0e16;
  background-size: 34px 34px, 34px 34px, auto, auto;
}
.visual-tag { display: block; color: var(--dim); font: 14px/1 var(--mono); letter-spacing: .15em; }
.t-account { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 30px 0 26px; background: var(--line); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.t-side { padding: 20px 18px; background: #0b0b12; }
.t-label { display: block; margin-bottom: 16px; color: var(--dim); font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.t-row { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; padding: 11px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 14.5px; }
.t-row b { font: 500 21px/1 var(--serif); }
.t-up { color: var(--ink); }
.t-up b { color: var(--acid); }
.t-flat b { color: var(--dim); }
.visual-caption { margin: 0; color: var(--muted); font-size: 15px; }
.visual-caption b { color: var(--ink); font-weight: 600; }
.visual-caption small { display: block; margin-top: 10px; color: var(--dim); font: 14px/1 var(--mono); letter-spacing: .16em; }

.premise { padding: 74px 0; border-bottom: 1px solid var(--line); }
.premise-grid { display: grid; grid-template-columns: .45fr 1.55fr; gap: 80px; align-items: start; }
.premise h2 { margin: 0; font: 400 clamp(30px, 4vw, 52px)/1.1 var(--serif); letter-spacing: -.035em; }
.premise-copy { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.premise-copy p { margin: 0; color: var(--muted); }
.premise-copy strong { color: var(--ink); }

/* 변화 유형 색 — 페이지 전체에서 같은 의미로 재사용한다 */
.kind-create { --kind: var(--acid); }
.kind-move { --kind: var(--cyan); }
.kind-convert { --kind: var(--electric); }
.kind-cancel { --kind: var(--rose); }
.kind-revalue { --kind: var(--gold); }
.kind-debt { --kind: var(--rose); }
.kind-real { --kind: var(--acid); }
.kind-external { --kind: var(--cyan); }

.change-rail { display: grid; grid-template-columns: repeat(5, 1fr); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.change-item { padding: 26px 22px 24px; border-right: 1px solid var(--line); background: var(--panel); }
.change-item:last-child { border-right: 0; }
.change-top { display: flex; align-items: center; gap: 9px; color: var(--kind); }
.change-top i { width: 8px; height: 8px; border-radius: 50%; background: currentColor; box-shadow: 0 0 15px currentColor; }
.change-top span { font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.change-item h3 { margin: 26px 0 6px; font: 400 27px/1.15 var(--serif); letter-spacing: -.02em; }
.change-item .change-q { margin: 0 0 14px; color: var(--kind); font-size: 14px; }
.change-item .change-ex { margin: 0; padding-top: 13px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.change-item .change-warn { margin: 11px 0 0; color: var(--dim); font-size: 14px; }

.layer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.layer-card {
  padding: 30px 28px; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(255,255,255,.035), transparent 55%), var(--panel);
  /* 강조는 좌측 색 막대가 아니라 우하단 두께로 */
  box-shadow: 5px 5px 0 color-mix(in srgb, var(--kind), transparent 84%),
              10px 10px 0 color-mix(in srgb, var(--kind), transparent 93%);
}
.layer-card:nth-child(1) { --kind: var(--gold); }
.layer-card:nth-child(2) { --kind: var(--cyan); }
.layer-card:nth-child(3) { --kind: var(--electric); }
.layer-card > span { color: var(--kind); font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.layer-card h3 { margin: 20px 0 8px; font: 400 32px/1.1 var(--serif); letter-spacing: -.03em; }
.layer-card .layer-sub { margin: 0 0 20px; color: var(--muted); font-size: 14.5px; }
.layer-rows { margin: 0; padding-top: 16px; border-top: 1px solid var(--line); }
.layer-rows div { display: grid; grid-template-columns: 74px minmax(0, 1fr); gap: 12px; padding: 7px 0; }
.layer-rows dt { color: var(--dim); font: 14px/1.5 var(--mono); letter-spacing: .06em; }
.layer-rows dd { margin: 0; color: var(--muted); font-size: 14px; }
.layer-limit { margin: 16px 0 0; padding-top: 14px; border-top: 1px solid var(--line); color: var(--dim); font-size: 14px; }

.explorer-controls { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 26px; }
.filter-chip { min-height: 40px; padding: 0 14px; border: 1px solid var(--line); border-radius: 999px; background: transparent; color: var(--muted); font-size: 14px; cursor: pointer; }
.filter-chip:hover { border-color: var(--line-strong); color: var(--ink); }
.filter-chip[aria-pressed="true"] { border-color: var(--electric); background: rgba(255,255,255,.06); color: var(--ink); }

/* 거래 실험실 / 헤드라인 해체 — 좌측 목록 + 우측 상세의 같은 골격을 공유 */
.lab-console, .news-console { display: grid; grid-template-columns: 330px minmax(0, 1fr); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--panel); }
.lab-list, .news-list { max-height: 720px; overflow-y: auto; border-right: 1px solid var(--line); background: #0d0d14; }
.lab-item, .news-item { display: block; width: 100%; padding: 17px 20px; border: 0; border-bottom: 1px solid var(--line); background: transparent; color: var(--muted); text-align: left; cursor: pointer; }
.lab-item:last-child, .news-item:last-child { border-bottom: 0; }
.lab-item em, .news-item em { display: block; margin-bottom: 6px; color: var(--kind, var(--dim)); font: 700 14px/1 var(--mono); font-style: normal; letter-spacing: .1em; }
.lab-item strong, .news-item strong { display: block; font-size: 14.5px; font-weight: 500; }
.lab-item:hover, .news-item:hover { color: var(--ink); background: rgba(255,255,255,.03); }
.lab-item[aria-selected="true"], .news-item[aria-selected="true"] { color: var(--ink); background: linear-gradient(90deg, rgba(159,169,255,.14), transparent); }
.lab-item[hidden], .news-item[hidden] { display: none; }

.lab-stage, .news-stage { padding: clamp(28px, 4vw, 48px); overflow: hidden; }
.stage-eyebrow { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; color: var(--dim); font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.stage-eyebrow .certainty { padding: 5px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); letter-spacing: .04em; font-weight: 400; }
.lab-stage h3, .news-stage h3 { margin: 22px 0 14px; font: 400 clamp(28px, 3.6vw, 46px)/1.12 var(--serif); letter-spacing: -.035em; }
.stage-headline { margin: 0 0 22px; color: var(--muted); font-size: 15px; }
.verdict-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 22px; }
.verdict-tags span { padding: 6px 11px; border: 1px solid color-mix(in srgb, var(--electric), transparent 60%); border-radius: 999px; color: var(--electric); font-size: 13.5px; }
.stage-summary { margin: 0 0 30px; max-width: 74ch; color: #d2d0d4; font-size: 16px; }

.flow-board { display: grid; gap: 9px; margin-bottom: 30px; }
.flow-row { display: grid; grid-template-columns: minmax(90px, 1fr) minmax(0, 1.5fr) minmax(90px, 1fr); gap: 12px; align-items: center; padding: 14px 16px; border: 1px solid var(--line); border-radius: 14px; background: #0e0e16; }
.flow-node { color: var(--ink); font-size: 14.5px; font-weight: 500; }
.flow-node:last-child { text-align: right; }
/* 연결선은 라벨 뒤를 가로지르고, 라벨만 배경색으로 선을 끊어 낸다 */
.flow-arrow { position: relative; display: flex; flex-direction: column; align-items: center; gap: 4px; color: var(--kind); }
.flow-arrow::before { content: ""; position: absolute; left: 0; right: 0; top: 9px; height: 1px; background: currentColor; opacity: .3; }
.flow-arrow em { position: relative; padding: 0 10px; background: #0e0e16; font: 700 13.5px/1.35 var(--mono); font-style: normal; letter-spacing: .03em; }
.flow-arrow b { color: var(--dim); font: 400 12.5px/1 var(--mono); letter-spacing: .12em; }

.stage-block { margin-bottom: 30px; }
.stage-block > h4 { margin: 0 0 14px; color: var(--dim); font: 700 14px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.change-table { display: grid; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.change-row { display: grid; grid-template-columns: 92px minmax(0, 1.1fr) 104px minmax(0, 1.3fr); gap: 14px; padding: 13px 16px; border-bottom: 1px solid var(--line); align-items: baseline; }
.change-row:last-child { border-bottom: 0; }
.change-row .actor { color: var(--dim); font: 14px/1.5 var(--mono); }
.change-row .item { color: var(--ink); font-size: 14.5px; }
.change-row .delta { font: 600 15px/1.4 var(--mono); white-space: nowrap; }
.change-row .delta.up { color: var(--acid); }
.change-row .delta.down { color: var(--rose); }
.change-row .delta.flat { color: var(--dim); }
.change-row .meaning { color: var(--muted); font-size: 14px; }

.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.metric-card { padding: 16px 18px; border: 1px solid var(--line); border-radius: 14px; background: #0e0e16; }
.metric-card span { display: block; margin-bottom: 9px; color: var(--dim); font-size: 13.5px; }
.metric-card strong { font: 500 26px/1 var(--serif); }
.metric-card.up strong { color: var(--acid); }
.metric-card.down strong { color: var(--rose); }
.metric-card.flat strong { color: var(--dim); }
.metric-card.warn strong { color: var(--gold); }
.metric-card.info strong { color: var(--cyan); font-size: 17px; line-height: 1.35; }

.stage-explain { margin: 0; max-width: 78ch; color: var(--muted); font-size: 14.5px; }
.correction-box { margin-top: 26px; padding: 22px 24px; border: 1px solid rgba(240,198,116,.28); border-radius: 16px; background: rgba(240,198,116,.05); box-shadow: 5px 5px 0 rgba(240,198,116,.14), 10px 10px 0 rgba(240,198,116,.06); }
.correction-box p { margin: 0; }
.correction-box .wrong { color: var(--dim); font-size: 14.5px; }
.correction-box .wrong b { display: block; margin-bottom: 6px; color: var(--gold); font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.correction-box .right { margin-top: 16px; padding-top: 16px; border-top: 1px solid rgba(240,198,116,.22); font: 400 20px/1.45 var(--serif); }

.ref-chips { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 26px; }
.ref-chip { padding: 5px 9px; border: 1px solid var(--line); border-radius: 999px; background: transparent; color: var(--acid); font: 14px/1 var(--mono); text-decoration: none; cursor: pointer; }
.ref-chip:hover { border-color: var(--acid); }

.split-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 26px; }
.split-card { padding: 22px 24px; border: 1px solid var(--line); border-radius: 16px; background: #0e0e16; }
.split-card h4 { margin: 0 0 14px; font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.split-card.certain h4 { color: var(--acid); }
.split-card.missing h4 { color: var(--gold); }
.split-card ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: 14.5px; }
.split-card li { margin-bottom: 9px; }
.split-card li:last-child { margin-bottom: 0; }
.rewrite-box { padding: 24px 26px; border: 1px solid color-mix(in srgb, var(--electric), transparent 62%); border-radius: 16px; background: color-mix(in srgb, var(--electric), transparent 94%); box-shadow: 5px 5px 0 color-mix(in srgb, var(--electric), transparent 84%), 10px 10px 0 color-mix(in srgb, var(--electric), transparent 93%); }
.rewrite-box span { color: var(--electric); font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.rewrite-box p { margin: 14px 0 0; font: 400 clamp(20px, 2.4vw, 26px)/1.42 var(--serif); }

.worksheet { margin-top: 34px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); overflow: hidden; }
.worksheet-head { padding: 30px clamp(24px, 4vw, 40px); border-bottom: 1px solid var(--line); background: #0d0d14; }
.worksheet-head h3 { margin: 14px 0 10px; font: 400 34px/1.12 var(--serif); letter-spacing: -.03em; }
.worksheet-head p { margin: 0; max-width: 70ch; color: var(--muted); font-size: 14.5px; }
.worksheet-body { padding: clamp(24px, 4vw, 40px); }
.worksheet-field { display: block; margin-bottom: 22px; }
.worksheet-field > span { display: block; margin-bottom: 9px; color: var(--dim); font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.worksheet-field input, .worksheet-field textarea, .worksheet-question textarea {
  width: 100%; padding: 13px 15px;
  border: 1px solid var(--line); border-radius: 12px;
  background: #0b0b12; color: var(--ink); font-size: 15px; line-height: 1.6; resize: vertical;
}
.worksheet-field input::placeholder, .worksheet-field textarea::placeholder, .worksheet-question textarea::placeholder { color: var(--dim); }
.worksheet-field input:focus, .worksheet-field textarea:focus, .worksheet-question textarea:focus { outline: none; border-color: var(--electric); }
.worksheet-questions { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 22px; }
/* 다섯 질문의 마지막은 홀로 남아 반쪽이 비므로 한 줄을 다 쓴다 */
.worksheet-question:last-child { grid-column: 1 / -1; }
.worksheet-question { padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; background: #0e0e16; }
.worksheet-question > span { display: block; margin-bottom: 6px; color: var(--kind); font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.worksheet-question > label { display: block; margin-bottom: 11px; color: var(--muted); font-size: 14.5px; }
.worksheet-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.worksheet-status { color: var(--acid); font: 14px/1 var(--mono); letter-spacing: .06em; }

.debate-list { display: grid; gap: 12px; }
.debate-card { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); overflow: hidden; }
.debate-toggle { display: grid; grid-template-columns: 118px minmax(0, 1fr) 30px; gap: 18px; align-items: center; width: 100%; padding: 26px 28px; border: 0; background: transparent; color: var(--ink); text-align: left; cursor: pointer; }
.debate-toggle .num { color: var(--dim); font: 700 14px/1 var(--mono); letter-spacing: .12em; white-space: nowrap; }
.debate-toggle h3 { margin: 0; font: 400 clamp(22px, 2.6vw, 32px)/1.2 var(--serif); letter-spacing: -.03em; }
.debate-toggle .mark { position: relative; width: 22px; height: 22px; justify-self: end; }
.debate-toggle .mark::before, .debate-toggle .mark::after { content: ""; position: absolute; inset: 50% 0 auto; height: 1px; background: var(--muted); transition: transform 180ms ease; }
.debate-toggle .mark::after { transform: rotate(90deg); }
.debate-toggle[aria-expanded="true"] .mark::after { transform: rotate(180deg); }
.debate-toggle:hover { background: rgba(255,255,255,.025); }
.debate-panel { padding: 0 28px 30px; }
.debate-question { margin: 0 0 22px; color: var(--cyan); font-size: 15px; }
.settled-box { padding: 20px 22px; margin-bottom: 20px; border: 1px solid color-mix(in srgb, var(--acid), transparent 66%); border-radius: 16px; background: color-mix(in srgb, var(--acid), transparent 95%); }
.settled-box span { color: var(--acid); font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.settled-box p { margin: 11px 0 0; color: #d2d0d4; font-size: 15px; }
.view-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.view-card { padding: 22px 24px; border: 1px solid var(--line); border-radius: 16px; background: #0e0e16; }
.view-card h4 { margin: 0 0 8px; font: 400 22px/1.25 var(--serif); }
.view-card .grade { display: inline-block; margin-bottom: 14px; padding: 5px 10px; border: 1px solid var(--line-strong); border-radius: 999px; color: var(--gold); font-size: 13px; }
.view-card p { margin: 0; color: var(--muted); font-size: 14.5px; }
.takeaway { margin: 20px 0 0; padding-top: 20px; border-top: 1px solid var(--line); font: 400 20px/1.45 var(--serif); }

.quiz-shell { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; align-items: start; }
.quiz-intro { position: sticky; top: 110px; }
.quiz-intro h2 { margin: 12px 0 20px; font: 400 clamp(34px, 4.4vw, 56px)/1.06 var(--serif); letter-spacing: -.045em; }
.quiz-intro > p { color: var(--muted); }
.quiz-score { display: inline-flex; gap: 10px; align-items: baseline; margin-top: 22px; color: var(--dim); font: 14px/1 var(--mono); letter-spacing: .12em; }
.quiz-score strong { color: var(--acid); font: 400 34px/1 var(--serif); }
.quiz-progress { height: 3px; margin: 16px 0 20px; background: var(--line); border-radius: 999px; overflow: hidden; }
.quiz-progress span { display: block; width: 0; height: 100%; background: var(--acid); transition: width 220ms ease; }
.quiz-tools { display: flex; flex-wrap: wrap; gap: 8px; }
.quiz-tools .button-ghost { min-height: 40px; font-size: 14px; }
.quiz-tools .button-ghost[aria-pressed="true"] { border-color: var(--acid); color: var(--acid); }
.quiz-list { display: grid; gap: 12px; }
.quiz-card { padding: 26px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.quiz-card[hidden] { display: none; }
.quiz-cat { color: var(--dim); font: 700 14px/1 var(--mono); letter-spacing: .12em; }
.quiz-card h3 { margin: 14px 0 20px; font: 500 17px/1.55 var(--sans); }
.quiz-choices { display: grid; gap: 8px; }
.quiz-choice { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 12px; align-items: center; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: transparent; color: var(--muted); text-align: left; font-size: 14.5px; cursor: pointer; }
.quiz-choice i { display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; border: 1px solid var(--line-strong); border-radius: 50%; font: 600 13px/1 var(--mono); font-style: normal; }
.quiz-choice:hover:not(:disabled) { border-color: var(--line-strong); color: var(--ink); }
.quiz-choice:disabled { cursor: default; }
.quiz-choice.is-correct { border-color: var(--acid); color: var(--acid); background: color-mix(in srgb, var(--acid), transparent 93%); }
.quiz-choice.is-correct i { border-color: var(--acid); }
.quiz-choice.is-wrong { border-color: var(--rose); color: var(--rose); }
.quiz-choice.is-wrong i { border-color: var(--rose); }
.quiz-feedback { margin: 18px 0 0; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14.5px; }
.quiz-feedback strong { color: var(--acid); }
.quiz-feedback.miss strong { color: var(--rose); }

.reference-controls { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 26px; }
.reference-tabs { display: flex; flex-wrap: wrap; gap: 8px; }
.reference-tab { min-height: 39px; padding: 0 13px; border: 1px solid var(--line); border-radius: 999px; background: transparent; color: var(--muted); font-size: 14px; cursor: pointer; }
.reference-tab[aria-selected="true"] { color: var(--ink); border-color: var(--electric); }
.search-box { display: flex; align-items: center; gap: 8px; min-width: 280px; border-bottom: 1px solid var(--line-strong); }
.search-box span { display: flex; color: var(--dim); }
.search-box svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; }
.search-box input { width: 100%; padding: 10px 0; border: 0; outline: 0; background: transparent; color: var(--ink); }
.search-box input::placeholder { color: var(--dim); }
.reference-list { border-top: 1px solid var(--line); }
.reference-item { display: grid; grid-template-columns: 55px 60px minmax(0, 1fr) 120px; gap: 18px; padding: 25px 0; border-bottom: 1px solid var(--line); align-items: start; }
.reference-item.flash { background: rgba(200,239,131,.06); }
.reference-id { color: var(--acid); font: 700 14px/1.4 var(--mono); }
.reference-year { color: var(--dim); font: 14px/1.4 var(--mono); }
/* 서지는 읽는 폭을 제한한다 — 1fr 로 두면 긴 제목이 눈을 놓친다 */
.reference-main { max-width: 68ch; }
.reference-main h3 { margin: 0 0 4px; font: 500 16.5px/1.4 var(--sans); }
.reference-main p { margin: 3px 0; color: var(--muted); font-size: 14px; }
.reference-main .detail { margin-top: 9px; color: var(--dim); }
.reference-meta { text-align: right; }
.reference-meta span { display: block; color: var(--dim); font: 14px/1.3 var(--mono); letter-spacing: .08em; }
.reference-meta a {
  display: inline-flex; align-items: center; gap: 5px; margin-top: 12px; padding: 5px 11px;
  border: 1px solid var(--line-strong); border-radius: 999px;
  color: var(--electric); font: 700 14px/1 var(--mono); text-decoration: none;
  transition: border-color .15s, color .15s, background-color .15s;
}
.reference-meta a:hover, .reference-meta a:focus-visible { border-color: var(--electric); background: rgba(159,169,255,.10); outline: none; }
/* 강조는 좌측 컬러 보더 대신 우하단 두께로 */
.source-policy {
  margin-top: 34px; padding: 24px 26px;
  border: 1px solid rgba(240,198,116,.30); border-radius: var(--radius);
  background: rgba(240,198,116,.05);
  box-shadow: 5px 5px 0 rgba(240,198,116,.16), 10px 10px 0 rgba(240,198,116,.07);
}
.source-policy h3 { margin: 0 0 10px; color: var(--gold); font: 400 24px/1.2 var(--serif); }
.source-policy p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* 스크롤바 — 폭을 항상 확보해 스크롤 유무로 레이아웃이 흔들리지 않게 한다 */
html { scrollbar-gutter: stable; scrollbar-width: thin; scrollbar-color: var(--line-strong) transparent; }
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { border: 3px solid transparent; border-radius: 999px; background: var(--line-strong); background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: var(--electric); background-clip: padding-box; }
::-webkit-scrollbar-corner { background: transparent; }
.lab-list, .news-list { scrollbar-width: thin; scrollbar-color: var(--line-strong) transparent; }

.site-footer { padding: 50px 0; border-top: 1px solid var(--line); }
.footer-inner { width: var(--shell); margin: auto; display: flex; justify-content: space-between; gap: 30px; align-items: flex-end; }
.footer-inner strong { display: block; font: 400 25px/1.2 var(--serif); }
.footer-inner p { margin: 10px 0 0; color: var(--dim); font-size: 14px; }
.footer-inner > a { color: var(--muted); font: 14px/1 var(--mono); letter-spacing: .12em; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity 600ms ease, transform 600ms ease; }
.reveal.visible { opacity: 1; transform: none; }
.noscript { margin: 90px auto 20px; width: var(--shell); padding: 18px; border: 1px solid var(--rose); color: var(--ink); }
.empty-state { padding: 36px; color: var(--dim); text-align: center; }

@media (max-width: 1080px) {
  .change-rail { grid-template-columns: repeat(2, 1fr); }
  .change-item { border-bottom: 1px solid var(--line); }
  .change-item:nth-child(2n) { border-right: 0; }
  .change-item:last-child { border-bottom: 0; grid-column: 1 / -1; }
}

@media (max-width: 980px) {
  :root { --shell: min(100% - 36px, 780px); }
  .primary-nav, .home-link { display: none; }
  .mobile-menu { display: block; }
  .hero { min-height: auto; padding-top: 130px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy h1 { font-size: clamp(72px, 18vw, 120px); }
  .ledger-visual { width: min(560px, 100%); justify-self: center; }
  .premise-grid, .section-heading { grid-template-columns: 1fr; gap: 30px; }
  .layer-grid { grid-template-columns: 1fr; }
  .lab-console, .news-console { grid-template-columns: 1fr; }
  .lab-list, .news-list { max-height: 300px; border-right: 0; border-bottom: 1px solid var(--line); }
  .change-row { grid-template-columns: 84px minmax(0, 1fr) auto; }
  .change-row .meaning { grid-column: 2 / -1; }
  .metric-grid { grid-template-columns: repeat(2, 1fr); }
  .split-grid, .worksheet-questions { grid-template-columns: 1fr; }
  .quiz-shell { grid-template-columns: 1fr; gap: 36px; }
  .quiz-intro { position: static; }
}

@media (max-width: 700px) {
  :root { --shell: calc(100% - 28px); }
  .section { padding: 82px 0; }
  .section-heading--sub { margin-top: 66px; }
  .header-inner { gap: 10px; }
  .brand small { display: none; }
  .hero { padding-bottom: 54px; }
  .hero-copy h1 { font-size: clamp(58px, 20vw, 88px); }
  .hero-lead { font-size: 16px; }
  .hero-meta { gap: 14px; }
  .hero-meta strong { font-size: 21px; }
  .premise { padding: 58px 0; }
  .premise-copy { grid-template-columns: 1fr; }
  .section-heading h2 { font-size: 40px; }
  .change-rail { grid-template-columns: 1fr; }
  .change-item { border-right: 0; }
  .t-account { grid-template-columns: 1fr; }
  .flow-row { grid-template-columns: 1fr; gap: 6px; text-align: left; }
  .flow-node:last-child { text-align: left; }
  .flow-arrow { align-items: flex-start; }
  .flow-arrow::before { display: none; }
  .flow-arrow em { padding-left: 0; }
  .change-row { grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
  .change-row .actor { grid-column: 1 / -1; }
  .change-row .meaning { grid-column: 1 / -1; }
  .metric-grid { grid-template-columns: 1fr; }
  .reference-controls { flex-direction: column; }
  .search-box { min-width: 0; width: 100%; }
  .reference-item { grid-template-columns: 42px 1fr; gap: 10px; }
  .reference-year { text-align: right; }
  .reference-main, .reference-meta { grid-column: 1 / -1; text-align: left; padding-left: 52px; }
  .debate-toggle { grid-template-columns: minmax(0, 1fr) 24px; gap: 12px; padding: 22px; }
  .debate-toggle .num { grid-column: 1 / -1; }
  .debate-panel { padding: 0 22px 26px; }
  .footer-inner { display: block; }
  .footer-inner > a { display: inline-block; margin-top: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  body { background: white; color: #111; }
  .site-header, .reading-progress, .hero-actions, .explorer-controls, .quiz, .worksheet-actions { display: none !important; }
  .hero { min-height: 0; padding-top: 30px; }
  .section { padding: 45px 0; }
  .layer-grid, .change-rail { grid-template-columns: 1fr; }
  .layer-card, .change-item, .debate-card, .lab-console, .news-console { break-inside: avoid; border-color: #bbb; background: white; color: #111; box-shadow: none; }
  .layer-card p, .section-heading > p, .premise-copy p { color: #444; }
}