:root {
    --paper: #f6f3ec;
    --paper-2: #efeadf;
    --ink: #1b1a15;
    --dim: #6f6957;
    --faint: #a49c86;
    --line: #d9d2bf;
    --line-dark: #b9b099;
    --green: #23593d;
    --green-wash: #e4e9df;
    --red: #93402e;
    --serif: "Newsreader", "Noto Serif KR", Georgia, "Times New Roman", serif;
    --mono: "IBM Plex Mono", "IBM Plex Sans KR", ui-monospace, Menlo, monospace;
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--serif);
    font-size: 17px;
    line-height: 1.72;
    -webkit-font-smoothing: antialiased;
  }
  ::selection { background: var(--ink); color: var(--paper); }

  /* ── 한글 타이포 보정: 합성 이탤릭 회피, 제목 행간 확보 ── */
  em, i { font-style: normal; }
  h1 em { color: var(--green); }
  h1 { line-height: 1.18; letter-spacing: -0.01em; }

  a { color: inherit; }
  .wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

  /* ── 공용 타입 ── */
  .label {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--dim);
  }
  .num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

  /* ── Masthead ── */
  .topbar {
    border-bottom: 1px solid var(--line-dark);
    font-family: var(--mono);
    font-size: 12px;
    color: var(--dim);
  }
  .topbar .wrap {
    display: flex; justify-content: space-between; align-items: baseline;
    padding-top: 10px; padding-bottom: 10px;
  }
  .topbar .issue { letter-spacing: 0.08em; text-transform: uppercase; }
  .tr-right { display: flex; gap: 22px; align-items: baseline; }
  .langs { display: flex; gap: 13px; }
  .langs a, .langs .on { text-decoration: none; letter-spacing: 0.04em; }
  .langs a:hover { color: var(--ink); }
  .langs .on { color: var(--ink); box-shadow: inset 0 -1px 0 var(--ink); }

  header.mast {
    position: sticky; top: 0; z-index: 20;
    background: rgba(246,243,236,0.94);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--ink);
  }
  .mast .wrap { display: flex; align-items: center; gap: 32px; height: 60px; }
  .wordmark {
    font-weight: 600; font-size: 22px; letter-spacing: -0.01em; margin-right: auto;
    text-decoration: none;
  }
  .wordmark i { color: var(--green); }
  nav.main { display: flex; gap: 24px; }
  nav.main a {
    font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em;
    text-decoration: none; color: var(--dim); padding: 4px 0;
  }
  nav.main a:hover { color: var(--ink); box-shadow: inset 0 -1px 0 var(--ink); }
  .btn {
    display: inline-block;
    font-family: var(--mono); font-size: 13px; letter-spacing: 0.03em;
    text-decoration: none; text-align: center;
    padding: 10px 22px;
    border: 1px solid var(--ink);
    transition: background .15s ease, color .15s ease;
  }
  .btn-solid { background: var(--ink); color: var(--paper); }
  .btn-solid:hover { background: transparent; color: var(--ink); }
  .btn-line:hover { background: var(--ink); color: var(--paper); }

  /* ── Hero ── */
  .hero { border-bottom: 1px solid var(--ink); }
  .hero .wrap {
    display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px; padding-top: 72px; padding-bottom: 72px;
    align-items: start;
  }
  h1 {
    font-size: clamp(40px, 5.4vw, 68px);
    font-weight: 500;
    margin: 20px 0 26px;
  }
  .hero-sub {
    font-size: 19px; line-height: 1.75; color: #33312a;
    max-width: 34em; margin: 0 0 34px;
  }
  .hero-sub strong { font-weight: 600; }
  .cta-row { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
  .hero-meta {
    margin-top: 30px;
    font-family: var(--mono); font-size: 12px; color: var(--dim);
    display: flex; gap: 18px; flex-wrap: wrap;
  }
  .hero-meta b { color: var(--ink); font-weight: 500; }

  /* 시그널 카드 — 증권 약정서 무드 */
  .signal-card { border: 1px solid var(--ink); background: var(--paper-2); }
  .signal-card .sc-head {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 16px; border-bottom: 1px solid var(--ink);
    font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  }
  .live-dot {
    display: inline-block; width: 7px; height: 7px; border-radius: 50%;
    background: var(--green); margin-right: 7px; vertical-align: 1px;
  }
  .sc-row {
    display: flex; justify-content: space-between; gap: 16px;
    padding: 13px 16px; border-bottom: 1px solid var(--line);
    font-size: 14px;
  }
  .sc-row:last-child { border-bottom: none; }
  .sc-row .k { font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em;
    text-transform: uppercase; color: var(--dim); padding-top: 4px; white-space: nowrap; }
  .sc-row .v { text-align: right; font-family: var(--mono); font-size: 13.5px; }
  .sc-foot {
    padding: 10px 16px; font-size: 13.5px; color: var(--dim);
    border-top: 1px solid var(--line);
  }

  /* ── 섹션 공통 ── */
  section { border-bottom: 1px solid var(--line-dark); }
  .sec-head {
    display: flex; align-items: baseline; gap: 20px;
    padding: 20px 0 0;
  }
  .sec-no { font-family: var(--mono); font-size: 12px; color: var(--faint); }
  .sec-head h2 {
    font-size: clamp(26px, 2.8vw, 34px); font-weight: 500; letter-spacing: -0.01em;
    margin: 0; line-height: 1.25;
  }
  .sec-body { padding: 18px 0 64px; }
  .lede { font-size: 19px; color: #33312a; max-width: 36em; margin: 0 0 40px; }

  /* ── 01 접근법: 팩터 ── */
  .factor-flow {
    display: grid; grid-template-columns: repeat(3, 1fr) auto 1fr;
    align-items: stretch; border: 1px solid var(--ink);
  }
  .factor-cell { border-right: 1px solid var(--ink); padding: 22px 20px 18px; }
  .factor-cell .fname { font-size: 21px; font-weight: 500; }
  .factor-cell .fdesc { font-size: 14px; color: var(--dim); line-height: 1.65; margin-top: 6px; }
  .factor-cell .fw { margin-top: 14px; font-family: var(--mono); font-size: 12px; color: var(--green); }

  /* ── 용어 툴팁: 어려운 지표 위에 마우스오버(모바일은 탭)하면 쉬운 말로 설명 ── */
  .term {
    position: relative;
    border-bottom: 1px dashed var(--faint);
    cursor: help;
    outline: none;
  }
  .term::before, .term::after {
    opacity: 0; visibility: hidden; pointer-events: none;
    transition: opacity .15s ease, transform .15s ease, visibility .15s ease;
    z-index: 60;
  }
  .term::after {
    content: attr(data-tip);
    position: absolute;
    left: 50%; bottom: calc(100% + 9px);
    transform: translateX(-50%) translateY(4px);
    width: max-content; max-width: min(320px, 86vw);
    background: var(--ink); color: var(--paper);
    font-family: var(--serif);
    font-size: 13px; line-height: 1.6; letter-spacing: normal; text-transform: none;
    text-align: left; padding: 10px 13px; border-radius: 3px;
    box-shadow: 0 6px 18px rgba(27,26,21,.28);
    white-space: normal;
  }
  .term::before {
    content: "";
    position: absolute;
    left: 50%; bottom: calc(100% + 4px);
    transform: translateX(-50%);
    border: 5px solid transparent; border-top-color: var(--ink);
  }
  .term:hover::before, .term:hover::after,
  .term:focus::before, .term:focus::after {
    opacity: 1; visibility: visible;
  }
  .term:hover::after, .term:focus::after {
    transform: translateX(-50%) translateY(0);
  }

  /* ── §02 equity 곡선 (tools/render_equity_chart.py가 마커 사이를 채움) ── */
  .equity-fig { margin: 30px 0 30px; border: 1px solid var(--line-dark); padding: 24px 24px 16px; background: var(--paper); }
  .equity-fig figcaption { font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim); margin: 0 0 14px; }
  .equity-fig svg { display: block; width: 100%; height: auto; }
  .equity-fig details { margin-top: 8px; }
  .equity-fig summary { cursor: pointer; font-family: var(--mono); font-size: 12px; color: var(--dim); }
  .equity-fig table { margin-top: 10px; font-size: 12.5px; border-collapse: collapse; }
  .equity-fig td { padding: 3px 26px 3px 0; border-bottom: 1px solid var(--line); }
  .eq-pt .eq-tip, .eq-pt .eq-ring { opacity: 0; pointer-events: none; transition: opacity 0.12s ease; }
  .eq-pt:hover .eq-tip, .eq-pt:hover .eq-ring { opacity: 1; }

  /* ── §02 실측 요약 피규어(계측치 3개) — 곡선은 실측 CSV 확보 후 마커 위치에 추가 ── */
  .growth-fig { margin: 30px 0; border: 1px solid var(--line-dark); background: var(--paper); padding: 24px 24px 20px; }
  .growth-fig figcaption { font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim); margin: 0 0 20px; }
  .gf-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; }
  .gf-cell { padding: 0 26px; border-left: 1px solid var(--line); }
  .gf-cell:first-child { border-left: none; padding-left: 0; }
  .gf-k { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim); margin-bottom: 10px; }
  .gf-hero { font-size: 26px; font-weight: 600; line-height: 1.3; letter-spacing: -0.01em; }
  .gf-hero .to { color: var(--green); }
  .gf-bars { margin-top: 14px; }
  .gf-bar { display: flex; align-items: center; gap: 10px; margin-top: 6px; }
  .gf-bar .bl { font-family: var(--mono); font-size: 11px; color: var(--dim); width: 48px; text-align: right; flex: none; }
  .gf-bar .bt { flex: 1; height: 13px; background: var(--paper-2); }
  .gf-bar .bf { display: block; height: 100%; border-radius: 0 4px 4px 0; }
  .gf-principal { background: var(--line-dark); }
  .gf-result { background: var(--green); }
  .gf-bar .bv { font-family: var(--mono); font-size: 11px; color: var(--dim); flex: none; }
  .gf-v { font-family: var(--mono); font-size: 28px; font-weight: 600; }
  .gf-s { font-size: 12.5px; color: var(--dim); margin-top: 4px; }
  @media (max-width: 900px) {
    .gf-grid { grid-template-columns: 1fr; }
    .gf-cell { border-left: none; padding: 16px 0 0; margin-top: 16px; border-top: 1px solid var(--line); }
    .gf-cell:first-child { padding-top: 0; margin-top: 0; border-top: none; }
  }
  .op-cell {
    display: flex; align-items: center; justify-content: center;
    border-right: 1px solid var(--ink);
    font-family: var(--mono); font-size: 18px; color: var(--dim);
    padding: 0 14px;
  }
  .out-cell { padding: 22px 20px 18px; background: var(--green-wash); }
  .out-cell .fname { font-size: 21px; font-weight: 500; }
  .out-cell .fdesc { font-size: 14px; color: #3c4a41; line-height: 1.65; margin-top: 6px; }
  .out-cell .fw { margin-top: 14px; font-family: var(--mono); font-size: 12px; }

  /* ── 02 성과표 ── */
  table.sweep { width: 100%; border-collapse: collapse; border: 1px solid var(--ink); }
  .sweep caption {
    caption-side: top; text-align: left;
    font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
    color: var(--dim); padding: 0 0 10px 2px;
  }
  .sweep th {
    font-family: var(--mono); font-weight: 500; font-size: 11px; letter-spacing: 0.12em;
    text-transform: uppercase; color: var(--dim);
    text-align: right; padding: 12px 16px; border-bottom: 1px solid var(--ink);
  }
  .sweep th:first-child { text-align: left; }
  .sweep td {
    padding: 12px 16px; border-bottom: 1px solid var(--line);
    font-size: 15.5px;
  }
  .sweep td.v { text-align: right; font-family: var(--mono); font-size: 13.5px; font-variant-numeric: tabular-nums; }
  .sweep td.name { font-weight: 500; }
  .sweep tr.picked td {
    background: var(--green-wash); border-top: 1px solid var(--green); border-bottom: 1px solid var(--green);
  }
  .sweep tr.picked td:first-child { box-shadow: inset 3px 0 0 var(--green); }
  .pick-tag {
    font-family: var(--mono); font-weight: 400; font-size: 10px; letter-spacing: 0.12em;
    color: var(--green);
    border: 1px solid var(--green); padding: 2px 7px; margin-left: 10px; vertical-align: 2px;
  }
  .tbl-note {
    margin-top: 14px; font-size: 13.5px; color: var(--dim); max-width: 46em; line-height: 1.7;
  }
  .tbl-note b { color: var(--ink); font-weight: 600; }

  /* ── 03 커스터디 원장 ── */
  .ledger { border: 1px solid var(--ink); }
  .ledger-row {
    display: grid; grid-template-columns: 1.1fr 1fr 1fr;
    border-bottom: 1px solid var(--line);
  }
  .ledger-row:last-child { border-bottom: none; }
  .ledger-row > div { padding: 15px 20px; font-size: 15px; }
  .ledger-row.head > div {
    font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
    color: var(--dim); padding: 11px 20px; border-bottom: 1px solid var(--ink);
    background: var(--paper-2);
  }
  .ledger-row .item { font-weight: 500; font-size: 16px; }
  .never { color: var(--red); }
  .always { color: var(--green); }
  .ledger-foot { padding: 12px 20px; font-size: 13.5px; color: var(--dim); }

  /* ── 04 작동 방식 ── */
  .clauses { max-width: 720px; }
  .clause {
    display: grid; grid-template-columns: 64px 1fr; gap: 18px;
    padding: 22px 0; border-top: 1px solid var(--line);
  }
  .clause:first-child { border-top: 1px solid var(--ink); }
  .clause:last-child { border-bottom: 1px solid var(--ink); }
  .clause .cn { font-family: var(--mono); font-size: 13px; color: var(--faint); padding-top: 5px; }
  .clause h3 { margin: 0 0 6px; font-size: 21px; font-weight: 500; }
  .clause p { margin: 0; color: #3c3a31; font-size: 16px; }

  /* ── 05 가격 ── */
  .price-band { background: var(--paper-2); }
  .price-flex { display: flex; gap: 48px; align-items: baseline; flex-wrap: wrap; }
  .price-big { font-size: clamp(34px, 4vw, 52px); font-weight: 500; letter-spacing: -0.01em; line-height: 1.1; }
  .price-note { max-width: 34em; color: #3c3a31; font-size: 16.5px; }
  .early-list {
    margin: 28px 0 0; padding: 0; list-style: none; max-width: 620px;
  }
  .early-list li {
    display: flex; gap: 12px; padding: 9px 0; border-top: 1px solid var(--line);
    font-size: 15.5px; color: #33312a;
  }
  .early-list li::before { content: "—"; color: var(--faint); }

  /* ── 06 FAQ ── */
  .faq { max-width: 720px; }
  details.qa { border-top: 1px solid var(--line); padding: 4px 0; }
  details.qa:first-of-type { border-top: 1px solid var(--ink); }
  details.qa:last-of-type { border-bottom: 1px solid var(--ink); }
  details.qa summary {
    cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 20px;
    padding: 16px 0; font-size: 19px; font-weight: 500;
  }
  details.qa summary::-webkit-details-marker { display: none; }
  details.qa summary::after {
    content: "+"; font-family: var(--mono); color: var(--dim); font-weight: 400;
  }
  details.qa[open] summary::after { content: "−"; }
  details.qa .a { padding: 0 0 20px; max-width: 58em; color: #3c3a31; font-size: 16px; }

  /* ── 하단 ── */
  .closing { border-bottom: none; }
  .closing .wrap { padding-top: 56px; padding-bottom: 64px; text-align: left; }
  .closing h2 {
    font-size: clamp(32px, 4vw, 50px); font-weight: 500; letter-spacing: -0.01em;
    line-height: 1.25; margin: 0 0 30px; max-width: 17em;
  }
  .closing h2 em { color: var(--green); }

  footer { border-top: 1px solid var(--ink); background: var(--paper-2); }
  footer .wrap { padding-top: 36px; padding-bottom: 40px; }
  .fineprint {
    font-size: 12.5px; line-height: 1.75; color: var(--dim); max-width: 62em;
    border-left: 2px solid var(--line-dark); padding-left: 16px; margin: 0 0 32px;
  }
  .foot-grid {
    display: flex; justify-content: space-between; align-items: baseline; gap: 24px; flex-wrap: wrap;
    font-family: var(--mono); font-size: 12px; color: var(--dim);
  }
  .foot-links { display: flex; gap: 22px; }
  .foot-links a { text-decoration: none; }
  .foot-links a:hover { color: var(--ink); }

  /* ── 반응형 ── */
  @media (max-width: 900px) {
    .hero .wrap { grid-template-columns: 1fr; gap: 44px; padding-top: 52px; padding-bottom: 56px; }
    nav.main { display: none; }
    .factor-flow { grid-template-columns: 1fr; }
    .factor-cell, .op-cell { border-right: none; border-bottom: 1px solid var(--ink); }
    .op-cell { padding: 6px; }
    .ledger-row { grid-template-columns: 1fr; }
    .ledger-row.head { display: none; }
    .ledger-row > div { border-bottom: 1px solid var(--line); padding: 10px 20px; }
    .ledger-row .item { border-bottom: none; padding-bottom: 2px; }
  }