:root {
      --primary: #0066FF;
      --primary-hover: #0057DB;
      --series: #0066FF;          /* 추이 선. 다크에서는 밝은 단계로 따로 고른다 */
      --ink: #171719;
      --muted: #747680;
      --bg: #F7F8FA;
      --surface: #FFFFFF;
      --soft: #F0F5FF;
      --line: rgba(112, 115, 124, 0.16);
      --radius: 12px;
      --good: #147D48;
      --good-bg: #EDFAF2;
      --warning: #B45309;
      --warning-bg: #FEF3C7;
      --critical: #C32635;
      --critical-bg: #FFF0F0;
    }

    @media (prefers-color-scheme: dark) {
      :root {
        --series: #5B9BFF;        /* #0066FF는 어두운 바탕에서 대비가 3:1 경계라 한 단계 밝게 */
        --ink: #EDEDED;
        --muted: #9E9E9E;
        --bg: #121214;
        --surface: #1E1E22;
        --soft: #1E293B;
        --line: rgba(255, 255, 255, 0.12);
        --good: #34D399;
        --good-bg: rgba(52, 211, 153, 0.12);
        --warning: #FBBF24;
        --warning-bg: rgba(251, 191, 36, 0.12);
        --critical: #F87171;
        --critical-bg: rgba(248, 113, 113, 0.12);
      }
    }

    * { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
      background: var(--bg);
      color: var(--ink);
      -webkit-font-smoothing: antialiased;
      line-height: 1.5;
    }

    header {
      padding: 24px 32px 16px;
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 16px;
      border-bottom: 1px solid var(--line);
      background: var(--surface);
    }
    .brand-title { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
    .brand-badge {
      font-size: 0.75rem; font-weight: 700; letter-spacing: 0.05em;
      padding: 2px 8px; border-radius: 6px; background: var(--soft); color: var(--primary);
    }
    header h1 { font-size: 1.35rem; font-weight: 700; margin: 0; letter-spacing: -0.02em; }
    header p { margin: 0; color: var(--muted); font-size: 0.85rem; }

    .btn {
      display: inline-flex; align-items: center; justify-content: center;
      padding: 7px 14px; font-size: 0.82rem; font-weight: 600; border-radius: 8px;
      border: 1px solid var(--line); background: var(--surface); color: var(--ink);
      cursor: pointer; transition: all 0.15s ease; font-family: inherit;
      white-space: nowrap; flex-shrink: 0;
    }
    .btn:hover { background: var(--soft); }
    .btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
    .btn-primary:hover { background: var(--primary-hover); }

    .wrap { padding: 24px 32px 48px; max-width: 1440px; margin: 0 auto; }

    .banner {
      display: flex; gap: 10px; align-items: flex-start;
      padding: 12px 16px; margin-bottom: 20px; border-radius: 10px;
      background: var(--warning-bg); color: var(--ink); font-size: 0.86rem;
      border: 1px solid var(--warning);
    }
    .banner .icon { color: var(--warning); font-weight: 700; }

    .kpi-row {
      display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
      gap: 16px; margin-bottom: 24px;
    }
    .kpi-card {
      background: var(--surface); border: 1px solid var(--line);
      border-radius: var(--radius); padding: 18px 20px;
    }
    .kpi-card .label { font-size: 0.8rem; font-weight: 500; color: var(--muted); margin-bottom: 8px; }
    .kpi-card .val {
      font-size: 1.7rem; font-weight: 700; letter-spacing: -0.02em;
      font-variant-numeric: tabular-nums; color: var(--ink); white-space: nowrap;
    }
    .kpi-card .sub { font-size: 0.75rem; color: var(--muted); margin-top: 6px; }

    .grid-2 {
      display: grid; grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
      gap: 20px; margin-bottom: 24px;
    }
    .grid-2 > .card { margin-bottom: 0; }
    .card {
      background: var(--surface); border: 1px solid var(--line);
      border-radius: var(--radius); padding: 20px 24px; margin-bottom: 24px;
    }
    .card-header { margin-bottom: 16px; }
    .card-header h2 { font-size: 1.05rem; font-weight: 700; margin: 0 0 4px; }
    .note { font-size: 0.8rem; color: var(--muted); margin: 0; }

    .table-wrap { overflow-x: auto; max-height: 520px; border: 1px solid var(--line); border-radius: 8px; }
    table.dt { border-collapse: collapse; font-size: 0.84rem; width: 100%; text-align: left; }
    table.dt th, table.dt td { padding: 9px 12px; border-bottom: 1px solid var(--line); white-space: nowrap; }
    table.dt th { color: var(--muted); font-weight: 600; background: var(--surface); position: sticky; top: 0; z-index: 2; }
    table.dt td.num, table.dt th.num { text-align: right; font-variant-numeric: tabular-nums; }

    table.cohort td.cell { text-align: center; font-variant-numeric: tabular-nums; font-weight: 500; }
    table.cohort td.empty { color: var(--muted); opacity: 0.4; }

    .pill { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: 0.74rem; font-weight: 600; }
    .pill.p0 { background: var(--critical-bg); color: var(--critical); }
    .pill.p1 { background: rgba(248, 113, 113, 0.15); color: var(--critical); }
    .pill.p2 { background: var(--warning-bg); color: var(--warning); }
    .pill.p3 { background: var(--good-bg); color: var(--good); }

    .toolbar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
    .toolbar button {
      font-family: inherit; font-size: 0.8rem; padding: 5px 12px; cursor: pointer;
      background: var(--surface); color: var(--muted); border: 1px solid var(--line);
      border-radius: 6px; transition: all 0.15s;
    }
    .toolbar button.active { background: var(--soft); color: var(--primary); border-color: var(--primary); font-weight: 600; }
    .search-input {
      font-family: inherit; font-size: 0.8rem; padding: 5px 10px; border-radius: 6px;
      border: 1px solid var(--line); background: var(--surface); color: var(--ink); min-width: 180px;
    }

    .chart-bar-row { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; font-size: 0.82rem; }
    .chart-bar-label { width: 75px; color: var(--muted); text-align: right; }
    .chart-bar-track { flex: 1; height: 22px; background: var(--bg); border-radius: 4px; overflow: hidden; }
    .chart-bar-fill { height: 100%; background: var(--series); border-radius: 0 4px 4px 0; }
    .chart-bar-val { width: 65px; font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
    .chart-aside { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); font-size: 0.82rem; color: var(--muted); }
    .chart-aside b { color: var(--ink); font-variant-numeric: tabular-nums; }

    /* 추이 차트 (인라인 SVG, 라이브러리 없음) */
    .trend { position: relative; }
    .trend svg { width: 100%; height: auto; display: block; overflow: visible; }
    .trend .axis { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
    .trend .grid { stroke: var(--line); stroke-width: 1; }
    .trend .recon-band { fill: var(--muted); opacity: 0.08; }
    .trend .line { fill: none; stroke: var(--series); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
    .trend .line.recon { stroke-dasharray: 4 4; opacity: 0.75; }
    .trend .cross { stroke: var(--muted); stroke-width: 1; display: none; }
    .trend .dot { fill: var(--series); stroke: var(--surface); stroke-width: 2; display: none; }
    .trend .tip {
      position: absolute; pointer-events: none; transform: translate(-50%, calc(-100% - 10px));
      background: var(--ink); color: var(--surface); font-size: 0.78rem; font-variant-numeric: tabular-nums;
      padding: 6px 9px; border-radius: 6px; white-space: nowrap;
    }
    details.table-view { margin-top: 10px; }
    details.table-view summary { cursor: pointer; font-size: 0.8rem; color: var(--muted); }
    details.table-view .table-wrap { max-height: 240px; margin-top: 8px; }

    dl.meta { display: grid; grid-template-columns: max-content 1fr; gap: 8px 24px; font-size: 0.85rem; margin: 0; }
    dl.meta dt { color: var(--muted); }
    dl.meta dd { margin: 0; font-variant-numeric: tabular-nums; }

    .loading-state, .error-state { padding: 60px 0; text-align: center; color: var(--muted); }
    .error-state { color: var(--critical); }

    @media (max-width: 640px) {
      header, .wrap { padding-left: 16px; padding-right: 16px; }
      .grid-2 { grid-template-columns: 1fr; }
      .kpi-card { padding: 14px 16px; }
      .kpi-card .val { font-size: 1.35rem; }
    }

/* V2: hierarchy, drill-down, and narrow-screen layouts. */
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
header { max-width: none; padding: 26px max(24px, calc((100vw - 1320px) / 2)); }
header h1 { font-size: 1.55rem; }
.wrap { max-width: 1370px; }
.section-nav { display:flex; gap:24px; padding:0 0 20px; margin-bottom:28px; border-bottom:1px solid var(--line); flex-wrap:wrap; }
.section-nav a { text-decoration:none; color:var(--muted); font-weight:600; font-size:.88rem; }
.section-nav a:hover { color:var(--primary); }
.section-heading { display:flex; justify-content:space-between; align-items:center; gap:16px; margin:30px 0 18px; flex-wrap:wrap; }
.section-heading h2 { margin:0 0 4px; font-size:1.35rem; letter-spacing:-.03em; }
.eyebrow { color:var(--muted); font-size:.68rem; font-weight:700; letter-spacing:.15em; margin:0 0 6px; }
.date-badge { font-size:.8rem; color:var(--muted); padding:6px 12px; border:1px solid var(--line); border-radius:8px; }
.primary-kpis { grid-template-columns:repeat(4,minmax(0,1fr)); }
.kpi-card { min-width:0; padding:22px; }
.kpi-card.featured { background:var(--soft); border-color:var(--series); }
.kpi-card.featured .val { color:var(--series); }
.kpi-card .val { font-size:clamp(1.15rem,2vw,1.9rem); }
small { font-size:.58em; margin-left:4px; font-weight:500; }
.action-cards { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:16px; margin-bottom:32px; }
.action-card { text-align:left; display:flex; flex-direction:column; gap:5px; background:var(--surface); color:var(--ink); border:1px solid var(--line); border-radius:12px; padding:16px 20px; font:inherit; cursor:pointer; }
.action-card:hover { border-color:var(--series); }
.action-card > span:first-child { font-size:.85rem; font-weight:600; }
.action-card strong { font-size:1.55rem; font-variant-numeric:tabular-nums; }
.period { margin:0; }
.period-note { margin-bottom:16px; }
.detail-grid { margin-top:20px; }
summary { cursor:pointer; font-weight:600; }
/* Boxed chevron disclosure; native details keeps keyboard and expanded-state semantics. */
details > summary {
  display: flex;
  align-items: center;
  position: relative;
  min-height: 32px;
  padding-left: 40px;
  list-style: none;
}
details > summary::marker { content: ''; }
details > summary::-webkit-details-marker { display: none; }
details > summary::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 28px;
  height: 28px;
  box-sizing: border-box;
  transform: translateY(-50%);
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  transition: background 150ms ease, border-color 150ms ease;
}
details > summary::after {
  content: '';
  position: absolute;
  left: 9px;
  top: 50%;
  width: 7px;
  height: 7px;
  box-sizing: border-box;
  border-right: 1.8px solid currentColor;
  border-bottom: 1.8px solid currentColor;
  color: var(--muted);
  transform: translateY(-50%) rotate(-45deg);
  transition: transform 150ms ease, color 150ms ease;
}
details[open] > summary::after { transform: translateY(-65%) rotate(45deg); }
details > summary:hover::before,
details > summary:focus-visible::before { background: var(--soft); border-color: var(--series); }
details > summary:hover::after,
details[open] > summary::after { color: var(--series); }
.pagination { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-top:16px; font-size:.8rem; color:var(--muted); flex-wrap:wrap; }
button:disabled { opacity:.45; cursor:default; }
:focus-visible { outline:3px solid var(--series); outline-offset:3px; }
.demo-label { color:var(--warning); border:1px dashed var(--warning); padding:10px 14px; border-radius:8px; margin-bottom:20px; font-size:.85rem; }
@media(max-width:1000px) { .primary-kpis { grid-template-columns:repeat(2,minmax(0,1fr)); } .grid-2 { grid-template-columns:1fr; } }
@media(max-width:640px) { header { padding:20px 16px; } header h1 { font-size:1.12rem; } .brand-title { flex-wrap:wrap; } .section-nav { gap:16px; } .action-cards { grid-template-columns:1fr; gap:8px; } .action-card { display:grid; grid-template-columns:1fr auto; align-items:center; } .action-card .note { grid-column:1/-1; } .card { padding:16px; } .section-heading h2 { font-size:1.12rem; } .kpi-card .val { white-space:normal; } dl.meta { grid-template-columns:1fr; gap:4px; } dl.meta dd { margin-bottom:10px; } }
@media(prefers-reduced-motion:reduce) { html { scroll-behavior:auto; } * { transition:none !important; } }