:root {
    --ground: #F8FAFC;
    --surface: #FFFFFF;
    --ink: #1E293B;
    --ink-soft: #475569;
    --ink-faint: #7C8899;
    --rule: #E2E8F0;
    --rule-soft: #EDF1F6;
    --accent: #3F51B5;
    --accent-soft: #E8EAF6;
    --on-accent: #FFFFFF;
    --flag: #B45309;
    --flag-soft: #FEF3C7;
    --shadow: 0 1px 2px rgba(30, 41, 59, .06), 0 8px 24px -12px rgba(30, 41, 59, .18);
  }

  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --ground: #0F141F;
      --surface: #161D2B;
      --ink: #E6EBF3;
      --ink-soft: #AEB9CB;
      --ink-faint: #7E8BA0;
      --rule: #2A3446;
      --rule-soft: #212A3A;
      --accent: #96A3EC;
      --accent-soft: #232C48;
      --on-accent: #0F141F;
      --flag: #FBBF24;
      --flag-soft: #3A2E12;
      --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px -12px rgba(0, 0, 0, .6);
    }
  }

  :root[data-theme="dark"] {
    --ground: #0F141F;
    --surface: #161D2B;
    --ink: #E6EBF3;
    --ink-soft: #AEB9CB;
    --ink-faint: #7E8BA0;
    --rule: #2A3446;
    --rule-soft: #212A3A;
    --accent: #96A3EC;
    --accent-soft: #232C48;
    --on-accent: #0F141F;
    --flag: #FBBF24;
    --flag-soft: #3A2E12;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px -12px rgba(0, 0, 0, .6);
  }

  * { box-sizing: border-box; }

  body {
    margin: 0;
    background: var(--ground);
    color: var(--ink);
    font-family: 'Noto Sans KR', system-ui, -apple-system, 'Malgun Gothic', sans-serif;
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }

  .wrap {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px 96px;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0 48px;
  }

  @media (min-width: 1000px) {
    .wrap { grid-template-columns: 232px minmax(0, 1fr); align-items: start; }
    .masthead { grid-column: 1 / -1; }
  }

  .masthead {
    padding: 72px 0 32px;
    border-bottom: 1px solid var(--rule);
    margin-bottom: 16px;
  }

  .eyebrow {
    font-size: 12px;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 700;
    margin: 0 0 18px;
  }

  h1 {
    font-family: 'Gowun Batang', 'Noto Sans KR', serif;
    font-size: clamp(34px, 6vw, 52px);
    line-height: 1.15;
    font-weight: 700;
    margin: 0 0 20px;
    letter-spacing: -.01em;
    text-wrap: balance;
  }

  .standfirst {
    font-size: 17px;
    color: var(--ink-soft);
    max-width: 62ch;
    margin: 0 0 28px;
  }

  .meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 28px;
    font-size: 13px;
    color: var(--ink-faint);
    align-items: center;
  }

  .meta b { color: var(--ink-soft); font-weight: 500; }

  .langs { display: flex; gap: 6px; margin-left: auto; }

  .langs button {
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    padding: 7px 16px;
    border-radius: 999px;
    border: 1px solid var(--rule);
    background: var(--surface);
    color: var(--ink-soft);
    cursor: pointer;
    transition: background .15s, color .15s, border-color .15s;
  }

  .langs button:hover { border-color: var(--accent); color: var(--accent); }

  .langs button[aria-pressed="true"] {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--on-accent);
  }

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

  nav.toc { display: none; }

  @media (min-width: 1000px) {
    nav.toc {
      display: block;
      position: sticky;
      top: 32px;
      font-size: 13.5px;
      line-height: 1.5;
      border-right: 1px solid var(--rule);
      padding: 44px 20px 0 0;
    }
    nav.toc p {
      font-size: 11px;
      letter-spacing: .16em;
      text-transform: uppercase;
      color: var(--ink-faint);
      font-weight: 700;
      margin: 0 0 14px;
    }
    nav.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
    nav.toc a {
      color: var(--ink-soft);
      text-decoration: none;
      display: grid;
      grid-template-columns: 22px 1fr;
      gap: 4px;
    }
    nav.toc a:hover { color: var(--accent); }
    nav.toc a .n { color: var(--ink-faint); font-variant-numeric: tabular-nums; }
  }

  main { max-width: 70ch; }

  section { padding-top: 44px; scroll-margin-top: 24px; }

  h2 {
    font-family: 'Gowun Batang', 'Noto Sans KR', serif;
    font-size: 25px;
    font-weight: 700;
    line-height: 1.3;
    margin: 0 0 16px;
    display: grid;
    grid-template-columns: 42px 1fr;
    align-items: baseline;
    text-wrap: balance;
  }

  h2 .num {
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 13px;
    font-weight: 700;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
  }

  h3 {
    font-size: 15px;
    font-weight: 700;
    margin: 28px 0 8px;
    color: var(--ink);
  }

  p { margin: 0 0 14px; color: var(--ink-soft); }

  ul { margin: 0 0 14px; padding-left: 20px; color: var(--ink-soft); }
  li { margin-bottom: 7px; }
  li::marker { color: var(--ink-faint); }

  strong { color: var(--ink); font-weight: 700; }

  a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }

  .table-scroll {
    overflow-x: auto;
    margin: 0 0 18px;
    border: 1px solid var(--rule);
    border-radius: 10px;
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  table { border-collapse: collapse; width: 100%; font-size: 14px; min-width: 560px; }

  th, td {
    text-align: left;
    padding: 13px 16px;
    vertical-align: top;
    border-bottom: 1px solid var(--rule-soft);
  }

  thead th {
    font-size: 11px;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--ink-faint);
    font-weight: 700;
    background: var(--ground);
    border-bottom: 1px solid var(--rule);
    white-space: nowrap;
  }

  tbody tr:last-child td { border-bottom: none; }
  td { color: var(--ink-soft); }
  td:first-child { font-weight: 500; color: var(--ink); }

  .note {
    border-left: 3px solid var(--accent);
    background: var(--accent-soft);
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
    margin: 0 0 18px;
    font-size: 14.5px;
  }

  .note p:last-child { margin-bottom: 0; }

  .todo {
    background: var(--flag-soft);
    color: var(--flag);
    font-weight: 700;
    padding: 1px 7px;
    border-radius: 4px;
    font-size: .92em;
  }

  footer {
    margin-top: 64px;
    padding-top: 24px;
    border-top: 1px solid var(--rule);
    font-size: 13px;
  }

  footer p { color: var(--ink-faint); }

  @media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
  }