:root {
    --paper: #e8ece4;
    --paper-raised: #f3f5f0;
    --ink: #1b231f;
    --ink-soft: #4a564e;
    --ink-faint: #7b8880;
    --line: rgba(27, 35, 31, 0.15);
    --line-strong: rgba(27, 35, 31, 0.28);
    --signal: #2f7d6e;
    --signal-soft: rgba(47, 125, 110, 0.10);
    --event: #a24a2f;
    --event-soft: rgba(162, 74, 47, 0.10);
    --shadow: rgba(27, 35, 31, 0.12);
  }

  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --paper: #0b1210;
      --paper-raised: #121a17;
      --ink: #e7eee8;
      --ink-soft: #9fb0a6;
      --ink-faint: #74857b;
      --line: rgba(231, 238, 232, 0.14);
      --line-strong: rgba(231, 238, 232, 0.26);
      --signal: #4fbfa8;
      --signal-soft: rgba(79, 191, 168, 0.12);
      --event: #d97b54;
      --event-soft: rgba(217, 123, 84, 0.12);
      --shadow: rgba(0, 0, 0, 0.4);
    }
  }

  :root[data-theme="dark"] {
    --paper: #0b1210;
    --paper-raised: #121a17;
    --ink: #e7eee8;
    --ink-soft: #9fb0a6;
    --ink-faint: #74857b;
    --line: rgba(231, 238, 232, 0.14);
    --line-strong: rgba(231, 238, 232, 0.26);
    --signal: #4fbfa8;
    --signal-soft: rgba(79, 191, 168, 0.12);
    --event: #d97b54;
    --event-soft: rgba(217, 123, 84, 0.12);
    --shadow: rgba(0, 0, 0, 0.4);
  }

  :root[data-theme="light"] {
    --paper: #e8ece4;
    --paper-raised: #f3f5f0;
    --ink: #1b231f;
    --ink-soft: #4a564e;
    --ink-faint: #7b8880;
    --line: rgba(27, 35, 31, 0.15);
    --line-strong: rgba(27, 35, 31, 0.28);
    --signal: #2f7d6e;
    --signal-soft: rgba(47, 125, 110, 0.10);
    --event: #a24a2f;
    --event-soft: rgba(162, 74, 47, 0.10);
    --shadow: rgba(27, 35, 31, 0.12);
  }

  * { box-sizing: border-box; }

  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
  }

  .page {
    max-width: 940px;
    margin: 0 auto;
    padding: 56px 24px 96px;
  }

  .eyebrow {
    display: block;
    font-family: ui-monospace, "SF Mono", monospace;
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--signal);
    margin-bottom: 10px;
  }

  h1 {
    font-family: "New York", ui-serif, Georgia, serif;
    font-size: clamp(1.6rem, 4vw, 2.15rem);
    font-weight: 500;
    line-height: 1.25;
    letter-spacing: -0.01em;
    margin: 0 0 14px;
  }

  .lede {
    margin: 0;
    font-size: 1rem;
    line-height: 1.75;
    color: var(--ink-soft);
    max-width: 66ch;
  }

  .meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    margin-top: 22px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    font-family: ui-monospace, "SF Mono", monospace;
    font-size: 0.72rem;
    color: var(--ink-faint);
  }

  .meta b { color: var(--ink-soft); font-weight: 600; }

  section { margin-top: 54px; }

  .sec-head {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 18px;
  }

  .sec-num {
    font-family: ui-monospace, "SF Mono", monospace;
    font-size: 0.72rem;
    color: var(--signal);
    padding: 2px 7px;
    border: 1px solid var(--line-strong);
    border-radius: 5px;
    flex-shrink: 0;
  }

  h2 {
    font-family: "New York", ui-serif, Georgia, serif;
    font-size: 1.22rem;
    font-weight: 500;
    margin: 0;
    letter-spacing: -0.005em;
  }

  .sec-tag {
    font-family: ui-monospace, "SF Mono", monospace;
    font-size: 0.64rem;
    letter-spacing: 0.1em;
    color: var(--ink-faint);
    margin-left: auto;
  }

  p { font-size: 0.92rem; line-height: 1.75; color: var(--ink-soft); max-width: 72ch; }
  p strong, li strong { color: var(--ink); font-weight: 600; }

  .card {
    background: var(--paper-raised);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 20px 22px;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.86rem;
  }

  th {
    text-align: left;
    font-family: ui-monospace, "SF Mono", monospace;
    font-size: 0.66rem;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--ink-faint);
    font-weight: 600;
    padding: 0 12px 9px 0;
    border-bottom: 1px solid var(--line-strong);
  }

  td {
    padding: 11px 12px 11px 0;
    border-bottom: 1px solid var(--line);
    color: var(--ink-soft);
    line-height: 1.6;
    vertical-align: top;
  }

  tr:last-child td { border-bottom: none; }
  td b { color: var(--ink); font-weight: 600; }

  .fig {
    margin: 4px 0 0;
    background: var(--paper-raised);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 22px 18px 14px;
  }

  .fig svg { display: block; width: 100%; height: auto; }

  .fig figcaption {
    margin-top: 14px;
    padding-top: 11px;
    border-top: 1px solid var(--line);
    font-family: ui-monospace, "SF Mono", monospace;
    font-size: 0.68rem;
    line-height: 1.55;
    color: var(--ink-faint);
  }

  .bullets { margin: 0; padding: 0; list-style: none; display: grid; gap: 9px; }

  /* Absolute-positioned dot rather than a flex row: in a flex list item each text
     node becomes its own flex item, so a long <b> label (fine in Chinese, long in
     English and French) collapses into a narrow column beside the rest of the
     sentence. Normal inline flow lets the label and the text wrap together. */
  .bullets li {
    position: relative;
    padding-left: 15px;
    font-size: 0.88rem;
    line-height: 1.65;
    color: var(--ink-soft);
  }

  .bullets li::before {
    content: '';
    position: absolute;
    left: 0;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--signal);
    top: 0.62em;
  }

  code, .mono {
    font-family: ui-monospace, "SF Mono", monospace;
    font-size: 0.85em;
    background: var(--signal-soft);
    color: var(--ink);
    padding: 1px 5px;
    border-radius: 4px;
  }

  .adr {
    display: grid;
    gap: 14px;
  }

  .adr-item {
    border-left: 2px solid var(--line-strong);
    padding: 2px 0 2px 18px;
  }

  .adr-item h3 {
    font-size: 0.94rem;
    font-weight: 600;
    color: var(--ink);
    margin: 0 0 6px;
    line-height: 1.5;
  }

  .adr-item .no {
    font-family: ui-monospace, "SF Mono", monospace;
    font-size: 0.7rem;
    color: var(--signal);
    margin-right: 7px;
  }

  .adr-item p { margin: 0; font-size: 0.87rem; }

  .callout {
    margin-top: 16px;
    background: var(--event-soft);
    border: 1px solid var(--line);
    border-left: 3px solid var(--event);
    border-radius: 0 10px 10px 0;
    padding: 16px 18px;
  }

  .callout .eyebrow { color: var(--event); }
  .callout p { margin: 0; font-size: 0.87rem; }

  .colophon {
    margin-top: 64px;
    padding-top: 18px;
    border-top: 1px solid var(--line-strong);
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    font-family: ui-monospace, "SF Mono", monospace;
    font-size: 0.7rem;
    color: var(--ink-faint);
  }

  .colophon b { color: var(--ink-soft); font-weight: 600; }

  @media (max-width: 640px) {
    .page { padding: 40px 16px 76px; }
    .sec-tag { display: none; }
    table, thead, tbody, tr, th, td { display: block; }
    th { display: none; }
    td { border-bottom: none; padding: 4px 0; }
    tr { border-bottom: 1px solid var(--line); padding: 10px 0; }
  }

/* ---------- language switcher ---------- */
.langbar {
  display: flex;
  gap: 6px;
  margin-bottom: 26px;
  font-family: ui-monospace, "SF Mono", monospace;
  font-size: 0.7rem;
}

.langbar a,
.langbar span {
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  color: var(--ink-faint);
}

.langbar a:hover { border-color: var(--signal); color: var(--signal); }

.langbar span[aria-current] {
  border-color: var(--signal);
  background: var(--signal-soft);
  color: var(--signal);
  font-weight: 600;
}