.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.solver-header-actions {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 7px;
}

.solver-wrong-book-button {
  position: relative;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
}

.solver-wrong-book-badge {
  position: absolute;
  top: -5px;
  right: -5px;
  min-width: 19px;
  height: 19px;
  display: grid;
  place-items: center;
  padding: 0 5px;
  border: 2px solid var(--bg);
  border-radius: 10px;
  background: var(--red);
  color: #fff;
  font-size: 10px;
  line-height: 1;
}

.solver-wrong-book-badge[hidden] { display: none; }

.solver-wrong-trigger,
.solver-wrong-saved-link {
  min-height: 32px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 8px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}

.solver-wrong-trigger:hover,
.solver-wrong-saved-link:hover { color: var(--red); }

.solver-wrong-trigger .lucide,
.solver-wrong-saved-link .lucide { width: 16px; height: 16px; }

.solver-wrong-capture {
  width: 100%;
  margin-top: 18px;
  padding: 16px 0 2px;
  border-top: 1px solid var(--line);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

.solver-wrong-capture[hidden] { display: none; }

.solver-wrong-loading {
  min-height: 42px;
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 13px;
}

.solver-wrong-loading .lucide {
  width: 17px;
  height: 17px;
  color: var(--red);
  animation: wrong-spin 900ms linear infinite;
}

.solver-wrong-capture-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 5px;
}

.solver-wrong-capture-title {
  margin: 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.4;
}

.solver-wrong-type {
  flex: 0 0 auto;
  max-width: 54%;
  padding: 4px 7px;
  overflow: hidden;
  border: 1px solid #e1c8c8;
  border-radius: 4px;
  color: var(--red);
  font-size: 11px;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.solver-wrong-capture-intro {
  margin: 0 0 13px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.solver-wrong-candidates {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.solver-wrong-candidate {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 9px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
}

.solver-wrong-candidate input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.solver-wrong-check {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  margin-top: 2px;
  border: 1px solid #aab2b0;
  border-radius: 3px;
  background: var(--bg);
  color: transparent;
}

.solver-wrong-check .lucide { width: 14px; height: 14px; }
.solver-wrong-candidate input:checked + .solver-wrong-check { border-color: var(--red); background: var(--red); color: #fff; }
.solver-wrong-candidate input:focus-visible + .solver-wrong-check { outline: 2px solid var(--ink); outline-offset: 2px; }

.solver-wrong-candidate-copy { min-width: 0; }
.solver-wrong-candidate-copy strong { display: block; font-size: 15px; font-weight: 500; line-height: 1.45; }
.solver-wrong-candidate-copy span { display: block; margin-top: 3px; color: var(--muted); font-size: 13px; line-height: 1.55; overflow-wrap: anywhere; }

.solver-wrong-custom {
  display: grid;
  gap: 6px;
  margin-top: 13px;
  color: var(--muted);
  font-size: 12px;
}

.solver-wrong-custom input {
  width: 100%;
  min-height: 44px;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
}

.solver-wrong-custom input:focus { border-color: #aab3b1; outline: 0; }

.solver-wrong-capture-status {
  min-height: 20px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.solver-wrong-capture-status.error { color: var(--red); }

.solver-wrong-capture-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 8px;
}

.solver-wrong-capture-actions button {
  min-height: 42px;
  padding: 0 14px;
  border-radius: 4px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.solver-wrong-skip { border: 0; background: transparent; color: var(--muted); }
.solver-wrong-save { border: 1px solid var(--red); background: var(--red); color: #fff; }
.solver-wrong-save:disabled { border-color: #c9cecd; background: #c9cecd; cursor: default; }

.solver-wrong-error {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: var(--muted);
  font-size: 13px;
}

.solver-wrong-error button {
  margin-left: auto;
  min-height: 36px;
  padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}

.wrong-book[hidden] { display: none; }

.wrong-book {
  position: absolute;
  inset: 0;
  z-index: 350;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}

.wrong-book-header {
  flex: 0 0 auto;
  min-height: 78px;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: calc(12px + env(safe-area-inset-top)) 16px 10px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.97);
}

.wrong-book-header > .icon-button,
.wrong-book-header-actions .icon-button {
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
}

.wrong-book-header h1 {
  margin: 1px 0 0;
  font-size: 25px;
  font-weight: 500;
  line-height: 1.2;
}

.wrong-book-header .eyebrow { margin: 0; font-size: 10px; }
.wrong-book-header-actions { display: flex; align-items: center; }
.wrong-book-header-actions[hidden] { display: none; }

.wrong-book-list-view,
.wrong-book-review-view {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  scrollbar-width: none;
}

.wrong-book-list-view::-webkit-scrollbar,
.wrong-book-review-view::-webkit-scrollbar { display: none; }
.wrong-book-list-view[hidden],
.wrong-book-review-view[hidden] { display: none; }

.wrong-book-overview {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--line);
}

.wrong-book-overview > div {
  display: grid;
  gap: 3px;
  padding: 0 12px 18px 0;
}

.wrong-book-overview strong {
  font-family: "Songti SC", "STSong", "SimSun", Georgia, serif;
  font-size: 34px;
  font-weight: 400;
  line-height: 1;
}

.wrong-book-overview span { color: var(--muted); font-size: 13px; }

#start-wrong-review {
  grid-column: 1 / -1;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--red);
  border-radius: 5px;
  background: var(--red);
  color: #fff;
  font: inherit;
  font-size: 15px;
  cursor: pointer;
}

#start-wrong-review:disabled { border-color: #c9cecd; background: #c9cecd; cursor: default; }
#start-wrong-review .lucide { width: 17px; height: 17px; }

.wrong-book-toolbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.97);
}

.wrong-book-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: 154px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface);
}

.wrong-book-tabs button {
  min-height: 34px;
  border: 0;
  border-radius: 3px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

.wrong-book-tabs button.active { background: var(--bg); color: var(--ink); box-shadow: 0 1px 4px rgba(20, 28, 28, 0.09); }

.wrong-book-subject-filter {
  position: relative;
  min-width: 112px;
}

.wrong-book-subject-filter select {
  width: 100%;
  min-height: 40px;
  padding: 7px 30px 7px 10px;
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-size: 13px;
}

.wrong-book-subject-filter .lucide {
  position: absolute;
  top: 50%;
  right: 9px;
  width: 15px;
  height: 15px;
  color: var(--muted);
  pointer-events: none;
  transform: translateY(-50%);
}

.wrong-book-status {
  min-height: 20px;
  margin: 0;
  padding: 9px 20px 0;
  color: var(--muted);
  font-size: 12px;
}

.wrong-book-status:empty { min-height: 0; padding-top: 0; }
.wrong-book-status.error { color: var(--red); }
.wrong-book-records { padding: 0 20px calc(28px + env(safe-area-inset-bottom)); }

.wrong-book-empty {
  display: grid;
  place-items: center;
  min-height: 280px;
  padding: 44px 24px;
  color: var(--muted);
  text-align: center;
}

.wrong-book-empty .lucide { width: 34px; height: 34px; margin-bottom: 13px; color: #aab2b0; }
.wrong-book-empty h2 { margin: 0; color: var(--ink); font-size: 19px; font-weight: 500; }
.wrong-book-empty p { max-width: 280px; margin: 7px 0 0; font-size: 13px; line-height: 1.6; }

.wrong-record {
  border-bottom: 1px solid var(--line);
}

.wrong-record summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

.wrong-record summary::-webkit-details-marker { display: none; }
.wrong-record-main { min-width: 0; }
.wrong-record-meta { display: flex; align-items: center; gap: 7px; margin-bottom: 6px; color: var(--red); font-size: 11px; }
.wrong-record-meta span + span::before { content: "·"; margin-right: 7px; color: var(--muted); }
.wrong-record h2 { margin: 0; overflow: hidden; font-size: 16px; font-weight: 500; line-height: 1.45; text-overflow: ellipsis; white-space: nowrap; }
.wrong-record-knowledge { margin: 5px 0 0; overflow: hidden; color: var(--muted); font-size: 13px; text-overflow: ellipsis; white-space: nowrap; }
.wrong-record-due { align-self: center; color: var(--muted); font-size: 11px; white-space: nowrap; }
.wrong-record-due.today { color: var(--red); }

.wrong-record-body {
  padding: 0 0 16px;
}

.wrong-record-question {
  margin: 0 0 12px;
  color: #47504e;
  font-family: "Songti SC", "STSong", "SimSun", Georgia, serif;
  font-size: 15px;
  line-height: 1.7;
  white-space: pre-wrap;
}

.wrong-record-items { display: grid; gap: 8px; }
.wrong-record-item { padding-left: 11px; border-left: 2px solid var(--red); }
.wrong-record-item strong { display: block; font-size: 14px; font-weight: 500; }
.wrong-record-item span { display: block; margin-top: 2px; color: var(--muted); font-size: 12px; line-height: 1.5; }

.wrong-record-actions {
  display: flex;
  justify-content: flex-end;
  gap: 4px;
  margin-top: 12px;
}

.wrong-record-actions button {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.wrong-record-actions button[data-wrong-delete] { color: var(--red); }
.wrong-record-actions .lucide { width: 17px; height: 17px; }

.wrong-review-progress {
  display: flex;
  justify-content: space-between;
  padding: 16px 20px 10px;
  color: var(--muted);
  font-size: 12px;
}

.wrong-review-track { height: 3px; margin: 0 20px; overflow: hidden; background: var(--line); }
.wrong-review-track span { display: block; width: 0; height: 100%; background: var(--red); transition: width 200ms ease; }

.wrong-review-content {
  padding: 22px 20px 128px;
}

.wrong-review-source-images {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.wrong-review-source-images img {
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface);
}

.wrong-review-question {
  margin: 0 0 22px;
  font-family: "Songti SC", "STSong", "SimSun", Georgia, serif;
  font-size: 18px;
  line-height: 1.85;
  white-space: pre-wrap;
}

.wrong-review-heading { margin: 24px 0 10px; font-size: 14px; font-weight: 500; }
.wrong-review-knowledge { display: grid; gap: 10px; }
.wrong-review-knowledge-item { padding: 12px 0 12px 13px; border-left: 3px solid var(--red); }
.wrong-review-knowledge-item strong { display: block; font-size: 16px; font-weight: 500; line-height: 1.45; }
.wrong-review-knowledge-item p { margin: 5px 0 0; color: var(--muted); font-size: 14px; line-height: 1.65; }

.wrong-review-answer {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.wrong-review-answer summary {
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
  list-style: none;
}

.wrong-review-answer summary::-webkit-details-marker { display: none; }
.wrong-review-answer summary .lucide { width: 16px; height: 16px; }
.wrong-review-answer-copy { padding-bottom: 8px; font-family: "Songti SC", "STSong", "SimSun", Georgia, serif; font-size: 15px; line-height: 1.8; }

.wrong-review-actions {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.97);
}

.wrong-review-actions button {
  min-width: 0;
  min-height: 60px;
  display: grid;
  grid-template-columns: 20px auto;
  grid-template-rows: auto auto;
  justify-content: center;
  column-gap: 6px;
  padding: 8px 5px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.wrong-review-actions button + button { border-left: 1px solid var(--line); }
.wrong-review-actions button:disabled { opacity: 0.42; cursor: default; }
.wrong-review-actions .lucide { grid-row: 1 / 3; align-self: center; width: 18px; height: 18px; color: var(--red); }
.wrong-review-actions small { color: var(--muted); font-size: 10px; white-space: nowrap; }

@keyframes wrong-spin { to { transform: rotate(360deg); } }

@media (max-width: 380px) {
  .solver-header { gap: 10px; }
  .solver-header-actions { gap: 3px; }
  .solver-wrong-book-button,
  .solver-settings-button { width: 40px; height: 40px; }
  .solver-session-switch { max-width: calc(100vw - 116px); font-size: 24px; gap: 7px; }
  .wrong-book-toolbar { align-items: stretch; flex-direction: column; }
  .wrong-book-tabs,
  .wrong-book-subject-filter { width: 100%; }
  .solver-wrong-capture-header { display: grid; }
  .solver-wrong-type { max-width: 100%; width: fit-content; }
}

@media (min-width: 600px) {
  .wrong-book-header,
  .wrong-book-overview,
  .wrong-book-toolbar,
  .wrong-book-status,
  .wrong-book-records,
  .wrong-review-progress,
  .wrong-review-content { padding-left: max(28px, calc((100% - 720px) / 2)); padding-right: max(28px, calc((100% - 720px) / 2)); }
  .wrong-review-track { margin-left: max(28px, calc((100% - 720px) / 2)); margin-right: max(28px, calc((100% - 720px) / 2)); }
  .wrong-review-actions { padding-left: max(28px, calc((100% - 720px) / 2)); padding-right: max(28px, calc((100% - 720px) / 2)); }
}

@media (prefers-reduced-motion: reduce) {
  .solver-wrong-loading .lucide { animation-duration: 1800ms; }
  .wrong-review-track span { transition: none; }
}