:root {
  --fg: #16181d;
  --muted: #6b7280;
  --line: #e6e8eb;
  --soft: #f6f7f8;
  --ok: #0f7b4f;
  --ok-bg: #f0f8f4;
  --bad: #b42318;
  --bad-bg: #fdf3f2;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: #fff;
  color: var(--fg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

button, input, select { font: inherit; color: inherit; }

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 22px;
}
.wrap.wide { max-width: 1040px; }

/* ---------- 顶栏 ---------- */
.bar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.bar-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand { font-weight: 600; letter-spacing: .01em; }
.sep { color: #c9ced6; margin: 0 6px; font-weight: 400; }
.bank-name { font-weight: 400; color: var(--muted); font-size: 14px; }
.bar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 14px;
}
.progress { color: var(--muted); font-variant-numeric: tabular-nums; }
.link {
  background: none;
  border: 0;
  padding: 0;
  color: var(--muted);
  cursor: pointer;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.link:hover { color: var(--fg); border-bottom-color: var(--fg); }

/* ---------- 正文 ---------- */
main { padding-bottom: 60px; }

.section {
  padding: 34px 0 26px;
  border-bottom: 1px solid var(--line);
}
.section:last-child { border-bottom: 0; }

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}
.sec-title { font-size: 15px; font-weight: 600; letter-spacing: .02em; }
.sec-count { font-size: 13px; color: var(--muted); }
.intro {
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--muted);
}

.passage {
  font-size: 16px;
  line-height: 1.85;
  color: #262a31;
  margin: 18px 0 22px;
}

details.src {
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--muted);
}
details.src summary {
  cursor: pointer;
  color: var(--muted);
  list-style: none;
}
details.src summary::-webkit-details-marker { display: none; }
details.src summary::before { content: "▸ "; }
details.src[open] summary::before { content: "▾ "; }
details.src pre {
  white-space: pre-wrap;
  font: inherit;
  background: var(--soft);
  border-radius: 8px;
  padding: 12px 14px;
  margin: 10px 0 0;
  color: #3a4048;
}

audio { width: 100%; margin: 4px 0 18px; }

/* ---------- 题目 ---------- */
.q { margin: 0 0 26px; }
.q:last-child { margin-bottom: 0; }
.q-stem {
  display: flex;
  gap: 10px;
  margin-bottom: 4px;
}
.q-no {
  flex: none;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  padding-top: 2px;
  min-width: 1.6em;
}
.q-text { font-weight: 500; }

.opts { margin: 8px 0 0 26px; }

.opt {
  display: flex;
  gap: 10px;
  width: 100%;
  text-align: left;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 13px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: border-color .12s, background .12s;
}
.opt:hover { border-color: #cfd4db; }
.opt .k {
  flex: none;
  color: var(--muted);
  font-weight: 500;
  width: 1.2em;
}
.opt[aria-checked="true"] {
  border-color: var(--fg);
  box-shadow: inset 0 0 0 1px var(--fg);
}
.opt[aria-checked="true"] .k { color: var(--fg); }

/* ---------- 选词填空 ---------- */
.bank {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 0 4px;
  margin-bottom: 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.chip {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 12px;
  cursor: pointer;
  font-size: 15px;
}
.chip:hover { border-color: #cfd4db; }
.chip.used { color: var(--muted); background: var(--soft); }

.blank {
  display: inline-block;
  min-width: 104px;
  border: 0;
  border-bottom: 1.5px solid #c9ced6;
  background: none;
  padding: 0 6px 1px;
  margin: 0 2px;
  text-align: center;
  cursor: pointer;
  color: var(--fg);
  line-height: 1.5;
}
.blank:empty::after { content: "\00a0"; }
.blank.active { border-bottom-color: var(--fg); background: #f2f4f7; }
.blank.filled { border-bottom-color: var(--fg); font-weight: 500; }
.blank.ok { color: var(--ok); border-bottom-color: var(--ok); }
.blank.bad { color: var(--bad); border-bottom-color: var(--bad); }

/* ---------- 匹配题 ---------- */
.paras { margin: 0 0 22px; }
.para {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 15px;
  line-height: 1.75;
  color: #262a31;
}
.para .lt {
  flex: none;
  width: 1.4em;
  color: var(--muted);
  font-weight: 600;
}
.match-row { margin-left: 26px; }
.match-row .q-text { font-weight: 400; margin-bottom: 8px; }

select.sel {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  padding: 4px 8px;
  min-width: 128px;
  cursor: pointer;
}
select.sel:focus { outline: 2px solid #d7dbe1; outline-offset: 1px; }
select.sel.ok { border-color: var(--ok); color: var(--ok); }
select.sel.bad { border-color: var(--bad); color: var(--bad); }

/* ---------- 判分结果 ---------- */
.feedback {
  margin: 8px 0 0 26px;
  font-size: 14px;
  line-height: 1.7;
  padding: 8px 12px;
  border-radius: 8px;
}
.feedback.good { background: var(--ok-bg); color: var(--ok); }
.feedback.bad { background: var(--bad-bg); color: var(--bad); }
.feedback .fb-line { display: block; }
.feedback .fb-exp { color: #4b5563; margin-top: 4px; }

/* ---------- 答题卡 ---------- */
.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  border-top: 1px solid var(--line);
  padding: 10px 0 14px;
}
.card {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 2px 0 12px;
}
.cell {
  width: 30px;
  height: 28px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  font-size: 13px;
  cursor: pointer;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.cell.done { border-color: #b9bfc7; color: var(--fg); background: var(--soft); }
.cell.cur { border-color: var(--fg); box-shadow: inset 0 0 0 1px var(--fg); color: var(--fg); }
.cell.ok { background: var(--ok-bg); border-color: #a8d5c1; color: var(--ok); }
.cell.bad { background: var(--bad-bg); border-color: #e8b4ae; color: var(--bad); }

.dock-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.spacer { flex: 1; }
.hint { font-size: 13px; color: var(--muted); }

.btn {
  border-radius: 7px;
  padding: 7px 16px;
  cursor: pointer;
  border: 1px solid var(--line);
  background: #fff;
}
.btn:hover { background: var(--soft); }
.btn.primary {
  background: var(--fg);
  border-color: var(--fg);
  color: #fff;
}
.btn.primary:hover { background: #000; }
.btn.ghost { color: var(--muted); }
.btn:disabled { opacity: .4; cursor: default; }
.btn.ghost:hover:disabled { background: #fff; }

/* ---------- 开始页 / 结果页 ---------- */
.hero { padding: 48px 0 8px; }
.hero h1 { font-size: 26px; margin: 0 0 8px; font-weight: 600; letter-spacing: -.01em; }
.hero p { margin: 0 0 4px; color: var(--muted); font-size: 15px; }

.stats {
  display: flex;
  gap: 34px;
  margin: 28px 0 30px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stat b {
  display: block;
  font-size: 24px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1.3;
}
.stat span { font-size: 13px; color: var(--muted); }

.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }

.result-list { padding: 10px 0 40px; }
.result-row {
  display: flex;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.result-row .no {
  flex: none;
  width: 1.8em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.result-row .mark { flex: none; width: 1.2em; }
.result-row .mark.ok { color: var(--ok); }
.result-row .mark.bad { color: var(--bad); }
.result-row .body { flex: 1; }
.result-row .ans { color: var(--muted); font-size: 13.5px; margin-top: 2px; }
.result-row .ans em { font-style: normal; font-weight: 500; }
.result-row .ans .wrong-ans { color: var(--bad); }

@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .bar-inner { padding: 10px 16px; gap: 8px; }
  .bank-name, .sep { display: none; }
  .bar-actions { gap: 12px; }
  .hero h1 { font-size: 22px; }
  .stats { gap: 22px; }
  .cell { width: 29px; height: 27px; }
  .dock-row .hint { display: none; }
  .btn { padding: 7px 12px; }
  .q-no { min-width: 1.3em; }
  .opts, .match-row { margin-left: 20px; }
}

/* ---------- 判分态样式补充 ---------- */
.opt.right { border-color: var(--ok); background: var(--ok-bg); }
.opt.right .k { color: var(--ok); }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.opt.wrong .k { color: var(--bad); }
.opt:disabled { cursor: default; }
.opt:disabled:hover { border-color: var(--line); }
.opt.right:disabled:hover { border-color: var(--ok); }
.opt.wrong:disabled:hover { border-color: var(--bad); }

.match-row .feedback { margin-left: 0; }
.warn { color: #b45309; font-size: 14px; }

.blank .sup {
  font-size: 10px;
  color: var(--muted);
  vertical-align: super;
  margin-left: 1px;
  font-weight: 400;
}

/* ---------- 对答案 ---------- */
.check-modes {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  margin: 18px 0 6px;
}
.seg {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 6px;
  padding: 3px 11px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
}
.seg:hover { border-color: #cfd4db; }
.seg.on { border-color: var(--fg); color: var(--fg); box-shadow: inset 0 0 0 1px var(--fg); }

.check-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 14px 0 12px;
}
.check-grid label { display: block; font-size: 13px; color: var(--muted); }
.check-grid textarea {
  width: 100%;
  height: 132px;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: 14px/1.7 ui-monospace, SFMono-Regular, Menlo, monospace;
  resize: vertical;
  background: #fff;
  color: var(--fg);
}
.check-grid textarea:focus { outline: none; border-color: #b9bfc7; box-shadow: 0 0 0 3px #f2f4f7; }

.check-tools { display: flex; gap: 10px; flex-wrap: wrap; }
.btn.tiny { padding: 3px 10px; font-size: 13px; }

.check-line {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0 4px;
  font-size: 14px;
}
.check-line .lbl { color: var(--muted); font-size: 13px; }
.check-line .nos { font-family: ui-monospace, Menlo, monospace; letter-spacing: .04em; }

table.chk {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  font-size: 14px;
  margin: 10px 0 40px;
}
.chk th {
  text-align: left;
  font-weight: 500;
  color: var(--muted);
  font-size: 13px;
  border-bottom: 1px solid var(--line);
  padding: 8px 6px;
}
.chk td { padding: 6px; border-bottom: 1px solid var(--line); font-family: ui-monospace, Menlo, monospace; }
.chk th:nth-child(1) { width: 4em; }
.chk th:nth-child(4) { width: 5em; }
.chk td:first-child { color: var(--muted); font-family: inherit; }
.chk .ok { color: var(--ok); }
.chk .bad { color: var(--bad); }
.chk .muted { color: #b0b6be; font-family: inherit; }

@media (max-width: 560px) {
  .check-grid { grid-template-columns: 1fr; }
  .check-grid textarea { height: 96px; }
}

/* ---------- 录入答案 ---------- */
.warn.banner {
  margin: 18px 0 6px;
  padding: 10px 14px;
  background: #fffaf0;
  border: 1px solid #f3e0bf;
  border-radius: 8px;
  font-size: 14px;
}
.warn.banner + .actions { margin-top: 14px; }
.warn.banner .link { color: var(--fg); margin-left: 8px; border-bottom-color: var(--fg); }

.check-grid.one { grid-template-columns: 1fr; }
.check-grid textarea.tall { height: 168px; }

.ans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: 5px;
  margin-top: 10px;
}
.ans-cell {
  display: flex;
  align-items: baseline;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 12.5px;
  color: var(--muted);
  min-height: 26px;
  font-family: ui-monospace, Menlo, monospace;
}
.ans-cell b { font-weight: 400; color: #b0b6be; font-size: 11px; }
.ans-cell.done { color: var(--fg); border-color: #b9bfc7; background: var(--soft); }
.ans-cell.done b { color: var(--muted); }

/* ---------- 试卷切换 / PDF 导入 ---------- */
.papers { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 0; }
.paper-chip {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 13.5px;
  color: var(--muted);
  cursor: pointer;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.paper-chip:hover { border-color: #cfd4db; color: var(--fg); }
.paper-chip.on { border-color: var(--fg); color: var(--fg); box-shadow: inset 0 0 0 1px var(--fg); }

.pbar {
  height: 4px;
  background: var(--soft);
  border-radius: 999px;
  overflow: hidden;
  margin: 16px 0 4px;
}
.pbar i { display: block; height: 100%; background: var(--fg); transition: width .2s; }

.imp-list { margin: 16px 0 8px; border-top: 1px solid var(--line); }
.imp-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
}
.imp-row .n { color: var(--muted); font-variant-numeric: tabular-nums; }

/* ---------- 长文档 + 左侧目录 ---------- */
html { scroll-behavior: smooth; scroll-padding-top: 68px; }

.layout {
  display: grid;
  grid-template-columns: 188px minmax(0, 1fr);
  gap: 44px;
  align-items: start;
}
.doc { min-width: 0; max-width: 720px; margin: 0 auto; }
.doc .section {
  padding: 26px 0 54px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 68px;
}
.doc .section:first-child { padding-top: 8px; }
.doc .section:last-child { border-bottom: 0; }

.rail {
  position: sticky;
  top: 72px;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  padding-bottom: 8px;
}
.rail-head {
  font-size: 11.5px;
  letter-spacing: .1em;
  color: #b0b6be;
  margin-bottom: 8px;
}
.toc { display: flex; flex-direction: column; gap: 1px; }
.toc-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  width: 100%;
  border: 0;
  background: none;
  padding: 6px 8px;
  border-radius: 6px;
  text-align: left;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
}
.toc-item:hover { background: var(--soft); color: var(--fg); }
.toc-item.on { background: var(--soft); color: var(--fg); font-weight: 500; }
.toc-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.toc-n { flex: none; font-size: 11px; color: #b0b6be; font-variant-numeric: tabular-nums; }
.toc-item.on .toc-n { color: var(--muted); }

.rail-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 4px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.rail-grid .cell {
  width: 100%;
  height: 22px;
  padding: 0;
  border-radius: 4px;
  font-size: 10.5px;
}

.rail-foot { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.rail-foot .hint { font-size: 12px; line-height: 1.5; }
.rail-foot .btn { width: 100%; }

.mbar { display: none; }

@media (max-width: 1023px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .rail {
    position: fixed;
    left: 0; right: 0; bottom: 0; top: auto;
    z-index: 40;
    background: #fff;
    border-top: 1px solid var(--line);
    border-radius: 16px 16px 0 0;
    padding: 18px 18px calc(100px + env(safe-area-inset-bottom, 0px));
    max-height: 70vh;
    overflow: auto;
    transform: translateY(105%);
    transition: transform .24s ease;
    box-shadow: 0 -10px 30px rgba(0, 0, 0, .1);
  }
  .rail.open { transform: translateY(0); }
  .mbar {
    display: flex;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    height: calc(58px + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
    z-index: 45;
    background: #fff;
    border-top: 1px solid var(--line);
    align-items: center;
    gap: 10px;
    padding: 0 14px;
  }
  .mbar-btn {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 999px;
    padding: 7px 16px;
    font-size: 14px;
    cursor: pointer;
  }
  .mbar-btn.primary { background: var(--fg); border-color: var(--fg); color: #fff; }
  .mbar-stat { flex: 1; text-align: center; font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
  main { padding-bottom: 84px; }
}

/* ---------- 顶栏卷子切换 ---------- */
.brand { position: relative; display: flex; align-items: center; }

.brand-home {
  border: 0;
  background: none;
  padding: 2px 2px;
  margin: 0;
  font: inherit;
  font-weight: 600;
  color: var(--fg);
  cursor: pointer;
  border-radius: 5px;
}
.brand-home:hover { background: var(--soft); }
.brand-home:active { transform: translateY(1px); }
.paper-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: 0;
  background: none;
  padding: 3px 6px;
  margin-left: -2px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--muted);
  font-size: 14px;
  max-width: 320px;
}
.paper-btn:hover { background: var(--soft); color: var(--fg); }
.paper-btn .bank-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 400;
}
.paper-btn .chev { flex: none; opacity: .65; }
.paper-btn[aria-expanded="true"] { background: var(--soft); color: var(--fg); }

.paper-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 60;
  min-width: 250px;
  max-width: 340px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 6px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .1);
}
.paper-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  text-align: left;
  border: 0;
  background: none;
  border-radius: 7px;
  padding: 8px 10px;
  cursor: pointer;
}
.paper-item:hover { background: var(--soft); }
.paper-item.on { background: var(--soft); }
.pi-name { font-size: 13.5px; color: var(--fg); }
.paper-item.on .pi-name { font-weight: 500; }
.pi-meta { font-size: 11.5px; color: #9aa1aa; font-variant-numeric: tabular-nums; }

/* ---------- 标记层 ---------- */
#inkCanvas {
  position: fixed;
  inset: 0;
  z-index: 35;
  pointer-events: none;
  touch-action: none;
}
#inkCanvas.on { pointer-events: auto; cursor: crosshair; }
body.inking { user-select: none; -webkit-user-select: none; }

/* 文字高亮：包成 <mark>，属于正文排版的一部分，缩放/重排都不会错位 */
mark.hl {
  background: transparent;
  color: inherit;
  padding: 0;
  border-radius: 2px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
mark.hl0 { background-color: rgba(253, 224, 71, .55); }
mark.hl1 { background-color: rgba(134, 239, 172, .55); }
mark.hl2 { background-color: rgba(249, 168, 212, .55); }
body.marking { cursor: text; }
body.marking .doc { user-select: text; -webkit-user-select: text; }

[hidden] { display: none !important; }

.ink-fab {
  position: fixed;
  right: calc(26px + env(safe-area-inset-right, 0px));
  bottom: calc(26px + env(safe-area-inset-bottom, 0px));
  z-index: 50;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--fg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(0, 0, 0, .12);
  transition: transform .15s ease;
}
.ink-fab:hover { transform: translateY(-1px); }
.ink-fab.on {
  background: var(--fg);
  border-color: var(--fg);
  color: #fff;
  box-shadow: 0 6px 22px rgba(0, 0, 0, .22);
}

.ink-bar {
  position: fixed;
  right: 26px;
  bottom: 88px;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 9px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, .12);
}
.ink-tool {
  border: 0;
  background: none;
  padding: 5px 9px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  line-height: 1.2;
}
.ink-tool:hover { background: var(--soft); color: var(--fg); }
.ink-tool.on { background: var(--fg); color: #fff; }

.ink-dots { display: inline-flex; align-items: center; gap: 6px; }

.ink-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--c);
  cursor: pointer;
  padding: 0;
}
.ink-dot.on { box-shadow: 0 0 0 2px #fff, 0 0 0 3.5px var(--c); }
.ink-sep { width: 1px; height: 18px; background: var(--line); margin: 0 2px; }
.ink-act {
  border: 0;
  background: none;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
}
.ink-act:hover { background: var(--soft); color: var(--fg); }
.ink-act.primary { color: var(--fg); font-weight: 500; }

@media (max-width: 1023px) {
  .ink-fab { right: calc(16px + env(safe-area-inset-right, 0px)); bottom: calc(74px + env(safe-area-inset-bottom, 0px)); width: 46px; height: 46px; }
  .ink-bar { right: 16px; bottom: 132px; }
}

/* 缩放时尽量不改变正文栏宽度，避免文字重排让手写标记错位 */
@media (max-width: 780px) {
  .doc { max-width: none; }
}

/* ---------- 数据备份 ---------- */
.data-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
}
.data-row .lbl { color: #b0b6be; font-size: 12px; letter-spacing: .06em; }
.data-row .link { color: var(--muted); }

/* ---------- 选词填空：词块搬进空格 ---------- */
.blank.filled {
  background: #f3f5f8;
  border: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 999px;
  padding: 1px 9px 2px;
  margin: 0 2px;
  font-weight: 500;
  line-height: 1.45;
}
.blank.filled .sup { opacity: .55; }
.blank.filled.ok { background: var(--ok-bg); border-color: #a8d5c1; }
.blank.filled.bad { background: var(--bad-bg); border-color: #e8b4ae; }
.blank.active { background: #f2f4f7; }
.bank.empty { padding: 14px 0 4px; }
.bank-empty { font-size: 13px; color: #b0b6be; }
.chip { transition: transform .12s ease, background .12s ease; }
.chip:active { transform: scale(.96); }

/* ---------- 写作 / 翻译 ---------- */
.essay .prompt {
  font-size: 14.5px;
  line-height: 1.8;
  color: #3a4048;
  background: var(--soft);
  border-radius: 8px;
  padding: 12px 14px;
  margin: 14px 0 12px;
  white-space: pre-wrap;
}
.essay .src-cn {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--fg);
  border-left: 3px solid var(--line);
  padding: 2px 0 2px 14px;
  margin: 0 0 16px;
}
.essay-input {
  width: 100%;
  min-height: 180px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: 15px/1.9 inherit;
  font-family: inherit;
  resize: vertical;
  color: var(--fg);
  background: #fff;
}
.essay-input:focus { outline: none; border-color: #b9bfc7; box-shadow: 0 0 0 3px #f2f4f7; }
.essay-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
}
.essay-bar .short { color: var(--bad); }
.essay-bar .spacer { flex: 1; }
.ai-status { margin-top: 12px; font-size: 13.5px; color: var(--muted); }
.ai-result {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 18px;
}
.ai-score { display: flex; align-items: baseline; gap: 6px; margin-bottom: 12px; }
.ai-score b { font-size: 30px; font-weight: 600; font-variant-numeric: tabular-nums; }
.ai-score span { color: var(--muted); font-size: 13px; }
.ai-score em { margin-left: 10px; font-style: normal; font-size: 13px; color: var(--muted); }
.ai-block { margin-top: 14px; }
.ai-block h4 { margin: 0 0 6px; font-size: 12.5px; font-weight: 500; color: #b0b6be; letter-spacing: .06em; }
.ai-block ul { margin: 0; padding-left: 18px; font-size: 14px; line-height: 1.8; }
.ai-block .issues code { background: var(--soft); border-radius: 4px; padding: 1px 5px; }
.ai-block .why { display: block; color: var(--muted); font-size: 13px; }
.ai-block .revised { margin: 0; font-size: 14px; line-height: 1.9; white-space: pre-wrap; }
.ai-conf { margin-top: 14px; padding: 14px; border: 1px solid var(--line); border-radius: 10px; background: #fcfcfd; }
.ai-conf label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.ai-conf input {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: 14px/1.5 ui-monospace, Menlo, monospace;
  color: var(--fg);
}
.ai-conf .actions { margin-top: 12px; display: flex; gap: 10px; }