/* Niuance tokens (apps/site/DESIGN.md): lightbox paper and ink; proofreader's red only marks what was caught. */
.dk {
  --paper: #eef2f0;
  --surface: #ffffff;
  --text: #121413;
  --muted: #5c6360;
  --rule: #c9d1cd;
  --mark: #d9262e;
  --serif: "Source Serif 4", "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  --ui: "Schibsted Grotesk", system-ui, -apple-system, "PingFang SC", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
  color: var(--text);
  font: 400 16px/1.7 var(--serif);
  background: var(--paper);
  min-height: 100vh;
}
@media (prefers-color-scheme: dark) {
  .dk { --paper: #101211; --surface: #1a1d1b; --text: #d8ded9; --muted: #9aa39e; --rule: #2c312e; --mark: #ff5a52; }
}
/* Chinese text (lang="zh-CN") always uses a Chinese face; the interface in German uses a Western serif first, since Chinese fonts carry Latin glyphs too and would win. */
.dk:not([data-lang="zh"]) { --serif: "Source Serif 4", Georgia, "Times New Roman", "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif; }
.dk [lang="zh-CN"] { font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif; }
html, body { margin: 0; background: #eef2f0; }
@media (prefers-color-scheme: dark) { html, body { background: #101211; } }
.dk *, .dk *::before, .dk *::after { box-sizing: border-box; }
.dk :focus-visible { outline: 2px solid var(--mark); outline-offset: 2px; }
.dk button, .dk input { font: inherit; color: inherit; }
.dk a { color: inherit; }
.dk b { font-weight: 700; }

.dk-kicker { margin: 0; font: 500 12px/1 var(--ui); letter-spacing: 0.06em; color: var(--muted); }
.dk-title { margin: 8px 0 0; font: 900 40px/1.15 var(--serif); }
.dk-title span { display: block; margin-top: 6px; font: 400 17px/1.4 var(--serif); color: var(--muted); }
.dk-langs { display: flex; flex-wrap: wrap; gap: 4px 14px; font: 400 13px/1.6 var(--ui); }
.dk-langs button { border: 0; background: none; padding: 0; color: var(--muted); cursor: pointer; }
.dk-langs button:hover { color: var(--mark); }
.dk-langs button[aria-pressed="true"] { color: var(--text); font-weight: 500; }
.dk-foot { margin-top: 64px; font: 400 12px/1.7 var(--ui); color: var(--muted); }

/* Hub */
.dk-hub { max-width: 1280px; margin: 0 auto; padding: 48px clamp(16px, 4vw, 48px) 96px; }
.dk-hub-head { display: grid; gap: 16px; max-width: 44rem; margin-bottom: 40px; }
.dk-intro { margin: 0; color: var(--muted); }
.dk-cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); }
.dk-card { display: flex; flex-direction: column; gap: 8px; padding: 24px; border: 1px solid var(--rule); border-radius: 6px; background: var(--surface); }
.dk-card h2 { margin: 0; font: 900 24px/1.25 var(--serif); }
.dk-card p { margin: 0 0 8px; color: var(--muted); font-size: 15px; }
.dk-card-sub { font: 400 14px/1.4 var(--serif); color: var(--muted); font-style: italic; }
.dk-card-links { margin-top: auto; display: flex; justify-content: space-between; gap: 12px; padding-top: 12px; border-top: 1px solid var(--rule); font: 500 14px/1.4 var(--ui); }
.dk-card-links a { text-decoration: none; }
.dk-card-links a:hover { color: var(--mark); }

/* Topic page */
.dk-shell { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 48px; max-width: 1280px; margin: 0 auto; padding: 48px clamp(16px, 4vw, 48px) 96px; }
.dk-side { position: sticky; top: 24px; align-self: start; display: flex; flex-direction: column; gap: 24px; }
.dk-back { font: 500 13px/1 var(--ui); color: var(--muted); text-decoration: none; }
.dk-back:hover { color: var(--mark); }
.dk-search { width: 100%; padding: 11px 14px; border: 1px solid var(--rule); border-radius: 4px; background: var(--surface); font: 400 16px/1.4 var(--ui); }
.dk-search:focus { border-color: var(--text); outline: none; }
[data-filters] { display: grid; gap: 20px; }
.dk-group { display: flex; flex-direction: column; gap: 8px; }
.dk-label { font: 500 12px/1 var(--ui); letter-spacing: 0.02em; color: var(--muted); }
.dk-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.dk-chip { border: 1px solid var(--rule); border-radius: 3px; background: transparent; padding: 4px 9px; font: 500 14px/1.4 var(--ui); cursor: pointer; }
.dk-chip:hover { border-color: var(--text); }
.dk-chip[aria-pressed="true"] { background: var(--text); border-color: var(--text); color: var(--paper); }
.dk-quest { display: block; padding: 14px 16px; border: 1px solid var(--text); border-radius: 4px; font: 500 14px/1.5 var(--ui); text-decoration: none; }
.dk-quest:hover { border-color: var(--mark); color: var(--mark); }
.dk-quest small { display: block; font-weight: 400; color: var(--muted); }
.dk[data-mode="drill"] [data-list-only], .dk[data-mode="rules"] [data-list-only], .dk:not([data-mode="drill"]) [data-drill-only] { display: none; }
.dk-bar { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px 24px; padding-bottom: 12px; border-bottom: 1px solid var(--rule); }
.dk-count { font: 400 13px/1.5 var(--ui); color: var(--muted); }
.dk-empty { margin: 48px 0; font: 400 17px/1.8 var(--serif); color: var(--muted); }

.dk-section { margin-top: 40px; }
.dk-section h2 { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; margin: 0 0 12px; font: 900 26px/1.2 var(--serif); }
.dk-section h2 span { font: 400 15px/1 var(--serif); font-style: italic; color: var(--muted); }
.dk-sec-intro { margin: -4px 0 12px; font: 400 14px/1.6 var(--ui); color: var(--muted); }
.dk-table { width: 100%; border-collapse: collapse; background: var(--surface); }
.dk-table th, .dk-table td { padding: 9px 12px; border: 1px solid var(--rule); text-align: left; vertical-align: baseline; overflow-wrap: anywhere; }
.dk-table thead th { font: 500 13px/1.3 var(--ui); color: var(--muted); }
.dk-table tbody th { font: 700 17px/1.35 var(--serif); }
.dk-table td { font: 400 16px/1.4 var(--serif); }
.dk-table td small, .dk-table th small { display: block; font: 400 12px/1.4 var(--ui); color: var(--muted); }
.dk-table .dk-tr { font-family: var(--ui); font-size: 14px; color: var(--muted); }
.dk-notes { margin-top: 48px; max-width: 46rem; }
.dk-notes h2 { margin: 0 0 12px; font: 900 22px/1.3 var(--serif); }
.dk-notes ol { margin: 0; padding-left: 1.4em; display: grid; gap: 10px; }

/* Drill */
.dk-drill { display: grid; gap: 14px; max-width: 42rem; margin-top: 40px; }
.dk-drill-kicker { margin: 0; font: 500 13px/1.5 var(--ui); color: var(--muted); }
.dk-drill-q { margin: 0; font: 400 clamp(28px, 4.6vw, 42px)/1.25 var(--serif); }
.dk-gap { border-bottom: 2px solid var(--text); color: var(--muted); }
.dk-drill-hint { margin: -4px 0 0; font: 400 16px/1.5 var(--ui); color: var(--muted); }
.dk-choices { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin-top: 8px; }
.dk-choice { display: flex; align-items: baseline; gap: 10px; padding: 14px 16px; border: 1px solid var(--rule); border-radius: 4px; background: var(--surface); font: 700 20px/1.2 var(--serif); cursor: pointer; text-align: left; }
.dk-choice small { font: 400 11px/1 var(--mono); color: var(--muted); }
.dk-choice:hover:not(:disabled) { border-color: var(--text); }
.dk-choice:disabled { cursor: default; color: var(--muted); }
.dk-choice[data-answer] { border-color: var(--text); background: var(--text); color: var(--paper); }
.dk-choice[data-answer] small { color: inherit; }
.dk-choice[data-wrong] { border-color: var(--mark); color: var(--mark); text-decoration: line-through; }
.dk-result { display: grid; gap: 10px; padding-top: 16px; border-top: 1px solid var(--rule); }
.dk-verdict { margin: 0; font: 500 16px/1.5 var(--ui); }
.dk-verdict[data-wrong] { color: var(--mark); }
.dk-row { display: grid; grid-template-columns: repeat(var(--cols), minmax(0, 1fr)); border: 1px solid var(--rule); background: var(--surface); }
.dk-row > span { display: grid; gap: 2px; padding: 8px 10px; border-left: 1px solid var(--rule); font: 400 17px/1.3 var(--serif); overflow-wrap: anywhere; }
.dk-row > span:first-child { border-left: 0; }
.dk-row small { font: 400 11px/1.3 var(--ui); color: var(--muted); }
.dk-row .dk-hit { box-shadow: inset 0 -3px 0 var(--text); }
.dk-note { margin: 0; padding-left: 12px; border-left: 2px solid var(--rule); font: 400 14px/1.6 var(--ui); color: var(--muted); }
.dk-next { justify-self: start; margin-top: 6px; padding: 10px 18px; border: 1px solid var(--text); border-radius: 4px; background: var(--text); font: 500 15px/1.2 var(--ui); cursor: pointer; }
.dk .dk-next { color: var(--paper); }
.dk-next:hover { background: var(--mark); border-color: var(--mark); }
.dk-hint { margin: 0; font: 400 13px/1.6 var(--ui); color: var(--muted); }
.dk-hint kbd { font: 400 11px/1 var(--mono); border: 1px solid var(--rule); border-radius: 3px; padding: 2px 5px; }

@media (max-width: 860px) {
  .dk-shell { grid-template-columns: minmax(0, 1fr); gap: 32px; padding-top: 32px; }
  .dk-side { position: static; }
  .dk[data-mode="drill"] .dk-side { order: 2; }
  .dk-title { font-size: 32px; }
  .dk-table th, .dk-table td { padding: 7px 6px; }
  .dk-table tbody th { font-size: 15px; }
  .dk-table td { font-size: 14px; }
  .dk-row { grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); }
  .dk-row > span { border-top: 1px solid var(--rule); }
}
@media (prefers-reduced-motion: reduce) { .dk * { transition: none !important; } }

/* Words read aloud (labels.js say) and the listen button after an answer. */
.dk-word { display: inline; padding: 0; border: 0; border-bottom: 1px dotted var(--muted); background: none; font: inherit; cursor: pointer; text-align: left; }
.dk-word:hover { color: var(--mark); border-bottom-color: var(--mark); }
.dk-word b { color: var(--mark); }
.dk-words { display: flex; flex-wrap: wrap; gap: 4px 14px; }
.dk[data-speech="off"] .dk-word { border-bottom: 0; cursor: text; }
.dk-say { justify-self: start; padding: 6px 12px; border: 1px solid var(--rule); border-radius: 4px; background: var(--surface); font: 500 14px/1.2 var(--ui); cursor: pointer; }
.dk-say:hover { border-color: var(--text); }
/* Letters a question points at (*…* in its text); the filled gap stays plain bold. */
.dk-drill-q b:not(.dk-fill) { text-decoration: underline 3px; text-underline-offset: 0.18em; }
.dk-choices[data-labels] .dk-choice { font: 500 16px/1.35 var(--ui); }
.dk-tag { display: inline-block; white-space: nowrap; overflow-wrap: normal; margin-left: 6px; padding: 1px 5px; border: 1px solid var(--mark); border-radius: 3px; font: 500 11px/1.4 var(--ui); color: var(--mark); vertical-align: 2px; }
.dk-ipa { font: 400 17px/1.3 var(--serif); white-space: nowrap; }
.dk-examples { list-style: none; margin: 0; padding: 0; border: 1px solid var(--rule); background: var(--surface); }
.dk-examples li { display: grid; gap: 2px; padding: 10px 14px; border-top: 1px solid var(--rule); font: 400 17px/1.45 var(--serif); }
.dk-examples li:first-child { border-top: 0; }
.dk-examples small { font: 400 13px/1.5 var(--ui); color: var(--muted); }
.dk-examples .dk-word { justify-self: start; }

/* Pinyin above the characters (pinyin.js ruby) and pinyin lines under a question. */
.dk ruby { ruby-position: over; ruby-align: center; }
.dk rt { font: 400 0.42em/1 var(--ui); letter-spacing: 0; color: var(--muted); }
.dk-drill-q ruby rt { font-size: 0.36em; }
.dk-py { margin: -6px 0 0; font: 400 18px/1.5 var(--ui); color: var(--muted); }
.dk[data-pinyin="off"] rt, .dk[data-pinyin="off"] .dk-py { visibility: hidden; }
.dk-pyswitch { align-self: start; padding: 4px 9px; border: 1px solid var(--rule); border-radius: 3px; background: transparent; font: 500 13px/1.4 var(--ui); cursor: pointer; }
.dk-pyswitch:hover { border-color: var(--text); }