/* 分句模式沿用主页面的纸张、墨色与绿色。 */
.mode-switch {
  display: inline-flex;
  flex: none;
  flex-wrap: wrap;
  gap: 4px;
  padding: 5px;
  margin: 0;
  border: 1px solid #e0e5d8;
  border-radius: 11px;
  background: #edf0e7;
}

.mode-button {
  min-height: 40px;
  padding: 9px 22px;
  border: 1px solid transparent;
  border-radius: 7px;
  background: transparent;
  color: #78846f;
  font-size: 12px;
  line-height: 1.6;
}

.mode-button:hover { color: var(--green); background: #f6f8f0; }
.mode-button > span {
  display: block;
  margin-top: 1px;
  font-size: 10px;
  font-weight: 400;
  color: #96a08c;
}
.mode-button[aria-pressed="true"] {
  border-color: #dce2d2;
  background: var(--paper);
  color: var(--green);
  font-weight: 600;
  box-shadow: 0 2px 6px #38492d06;
}

.sentence-overview { margin-bottom: 20px; }
.sentence-overview .paper-header { padding-bottom: 24px; }
.sentence-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin: 0 38px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.group-size-control {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.group-size-control label { font-size: 12px; color: #65755b; }
.group-size-control input {
  width: 76px;
  min-height: 41px;
  padding: 8px 10px;
  border: 1px solid #d7dfcf;
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}
.group-size-control input:focus { border-color: #829a73; }
.group-size-control input[aria-invalid="true"] { border-color: var(--red); }
.reference-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.sentence-help {
  margin: 17px 38px 24px;
  font-size: 11px;
  line-height: 1.9;
  color: #839077;
}
#groupingError {
  margin: 0 38px 24px;
  padding: 10px 13px;
  border-radius: 7px;
  background: #fcf0ed;
  color: #b34e47;
  font-size: 12px;
  line-height: 1.8;
}

.sentence-groups { display: grid; gap: 20px; }
.sentence-group {
  min-width: 0;
  padding: 26px 32px 24px;
  border: 1px solid #e1e4d9;
  border-radius: 13px;
  background: var(--paper);
  box-shadow: 0 4px 24px #38492d04;
  scroll-margin-top: 24px;
}
.sentence-group:focus-within { border-color: #b1c0a5; }
.sentence-group.is-correct { border-color: #bdcfb2; }
.sentence-group-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}
.group-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 29px;
  min-height: 29px;
  padding: 3px 7px;
  border-radius: 7px;
  background: #eff3e8;
  color: #718360;
  font: 12px/1.5 var(--typing-font);
}
.sentence-group-header h3 {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  font-weight: 550;
  overflow-wrap: anywhere;
}
.group-state { font-size: 10px; line-height: 1.7; color: #8b9680; }
.sentence-group.is-correct .group-state { color: var(--green); }
.sentence-translation {
  margin-bottom: 13px;
  padding: 15px 19px;
  border: 1px solid #dfe5d6;
  border-radius: 8px;
  background: #fbfcf7;
}
.translation-label { font-size: 11px; color: #708363; }
.translation-content {
  margin: 8px 0;
  color: #43543d;
  font-size: 15px;
  line-height: 1.9;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.translation-content:empty { display: none; }
.translation-status {
  color: #849078;
  font-size: 10px;
  line-height: 1.8;
  overflow-wrap: anywhere;
}
.translation-status { margin: 6px 0 0; }
.translation-status.has-errors { color: #b44c45; }
.translation-status:empty { display: none; }
.translation-retry { margin-top: 10px; }
.translation-service-link { display: inline-block; margin-top: 9px; color: var(--green); font-size: 12px; }
.sentence-reference,
.reference-placeholder {
  margin: 0 0 20px;
  padding: 17px 19px;
  border: 1px solid #e4e9db;
  border-radius: 8px;
  background: #f5f7ee;
}
.sentence-reference {
  font-family: var(--typing-font);
  font-size: 18px;
  line-height: 1.85;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: #4b6044;
  tab-size: 1;
  cursor: text;
  user-select: text;
  -webkit-user-select: text;
}
.sentence-reference:focus-visible { outline: 2px solid #8fac96; outline-offset: 3px; }
.sentence-reference::selection { background: #cddfc4; color: #213c28; }
.reference-placeholder {
  min-height: 0;
  padding-top: 10px;
  padding-bottom: 10px;
  display: flex;
  align-items: center;
  color: #8d9b81;
  font-size: 11px;
  line-height: 1.8;
  background: #f9faf5;
  border-style: dashed;
}
.group-input-label {
  display: block;
  margin-bottom: 9px;
  font-size: 12px;
  line-height: 1.7;
  color: #63765a;
}
.sentence-answer,
.checked-answer {
  display: block;
  width: 100%;
  min-height: 135px;
  margin: 0;
  padding: 16px 19px;
  border: 1px solid #dce3d2;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-family: var(--typing-font);
  font-size: 18px;
  font-weight: 400;
  line-height: 1.85;
  font-variant-ligatures: none;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: normal;
  tab-size: 1;
  text-align: left;
}
.sentence-answer { resize: vertical; caret-color: var(--green); }
.sentence-answer::placeholder {
  color: #a1aa97;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 12px;
}
.sentence-answer:focus,
.checked-answer:focus-visible {
  border-color: #829a73;
  outline: 3px solid #8fac9633;
  outline-offset: 2px;
  box-shadow: 0 0 0 3px #879e770c;
}
.checked-answer { background: #fdfdf9; }
.checked-answer:empty::before {
  content: "还没有输入文字，请点击“修改输入”后重试。";
  color: #929d86;
  font: 12px/1.9 -apple-system, BlinkMacSystemFont, "Microsoft YaHei", sans-serif;
}
.word-correct { color: var(--ink); }
.word-error,
.word-extra {
  border-radius: 2px;
  background: #c6474710;
  color: #bf3f3f;
  text-decoration: underline;
  text-decoration-color: #c6474773;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
.group-feedback {
  margin: 13px 0 0;
  font-size: 11px;
  line-height: 1.9;
  color: #8a967f;
  overflow-wrap: anywhere;
}
.group-feedback.is-correct { color: var(--green); }
.group-feedback.has-errors { color: #b44c45; }
.group-feedback:empty { display: none; }
.missing-words {
  margin-top: 9px;
  font-size: 11px;
  line-height: 2.2;
  color: #a55a4d;
  overflow-wrap: anywhere;
}
.missing-word {
  display: inline;
  margin: 0 3px;
  padding: 3px 6px;
  border: 1px dashed #dfb7aa;
  border-radius: 4px;
  background: #fff3ed;
  color: #ac5142;
  font-family: var(--typing-font);
  font-size: 13px;
  white-space: pre-wrap;
}
.sentence-group-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 9px;
  margin-top: 14px;
}
.sentence-summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin: 19px 0 16px;
  font-size: 11px;
  color: #829075;
  line-height: 1.8;
}
.sentence-session-status { margin: 0; }
.answer-empty { color: #929d86; font-size: 13px; }
.sentence-session-status.complete { color: var(--green); }
#sentenceProgress { flex: none; font-variant-numeric: tabular-nums; }

@media (max-width: 760px) {
  .mode-button { padding: 8px 17px; font-size: 11px; }
  .sentence-overview { margin-bottom: 16px; }
  .sentence-controls { margin: 0 23px; gap: 14px; padding: 18px 0; }
  .group-size-control { gap: 8px; }
  .group-size-control label { font-size: 11px; }
  .group-size-control input { min-height: 39px; width: 65px; }
  .sentence-help { margin: 14px 23px 20px; font-size: 10px; }
  #groupingError { margin: 0 23px 20px; font-size: 11px; }
  .sentence-groups { gap: 16px; }
  .sentence-group { padding: 20px 22px; }
  .sentence-group-header { gap: 8px; margin-bottom: 15px; }
  .sentence-group-header h3 { font-size: 13px; }
  .group-state { font-size: 9px; }
  .sentence-reference,
  .reference-placeholder { padding: 14px; margin-bottom: 17px; }
  .reference-placeholder { padding-top: 8px; padding-bottom: 8px; }
  .sentence-reference { font-size: 17px; }
  .sentence-translation { padding: 14px; }
  .translation-content { font-size: 14px; }
  .sentence-answer,
  .checked-answer { padding: 14px; font-size: 17px; min-height: 140px; }
  .sentence-group-actions { margin-top: 12px; }
  .sentence-summary { margin-top: 15px; font-size: 10px; }
}

@media (max-width: 400px) {
  .mode-switch { display: flex; width: 100%; }
  .mode-button { flex: 1; padding: 8px 10px; }
  .sentence-controls { margin-left: 19px; margin-right: 19px; }
  .group-size-control { width: 100%; }
  .group-size-control label { flex: 1; }
  .reference-actions { width: 100%; }
  .reference-actions .button { flex: 1; }
  .sentence-help,
  #groupingError { margin-left: 19px; margin-right: 19px; }
  .sentence-group { padding: 18px 17px; }
  .sentence-group-header { gap: 7px; }
  .group-number { min-width: 26px; min-height: 26px; }
  .sentence-group-actions .button { min-height: 42px; }
}