/* 辅导页：单焦点对话布局。题目上下文默认收起，移动端输入区固定在底部导航上方。 */
#tutorPage {
  width: min(760px, 100%);
  margin: 0 auto;
}

.tutor-page-shell {
  display: grid;
  gap: 14px;
}

.tutor-page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 2px 2px 0;
}

.tutor-page-head h2 {
  font-size: clamp(24px, 4vw, 32px);
}

.tutor-status {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.tutor-status > span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 12px #59d4a9aa;
}

.tutor-context-card {
  padding: 14px 16px;
  border-color: #42e8d033;
  background: linear-gradient(145deg, #121d31, #0c1425);
}

.tutor-context-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: 62px;
  list-style: none;
  cursor: pointer;
}

.tutor-context-summary::-webkit-details-marker {
  display: none;
}

.tutor-context-copy {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.tutor-context-copy > small {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .08em;
}

.tutor-context-heading {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.tutor-context-heading b {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#tutorContextPreview {
  overflow: hidden;
  color: #aeb9d0;
  font-size: 12px;
  line-height: 1.5;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tutor-context-action {
  flex: 0 0 auto;
  color: var(--cyan);
  font-size: 12px;
}

.tutor-context-action::before {
  content: "展开";
}

.tutor-context-card[open] .tutor-context-action::before {
  content: "收起";
}

.tutor-context-editor {
  display: grid;
  grid-template-columns: minmax(130px, 170px) minmax(0, 1fr) auto;
  align-items: end;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.tutor-context-editor label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
}

.tutor-context-editor textarea {
  min-height: 76px;
}

#tutorPage .chat-box {
  min-height: 360px;
  height: min(52vh, 560px);
  max-height: none;
  padding: 8px 3px 18px;
  overscroll-behavior: contain;
  scroll-padding: 18px;
  -webkit-overflow-scrolling: touch;
}

#tutorPage .message {
  position: relative;
  max-width: min(82%, 620px);
  padding: 14px 16px;
  border: 1px solid transparent;
  box-shadow: 0 8px 24px #0003;
}

#tutorPage .message::before {
  display: block;
  margin-bottom: 5px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .06em;
  opacity: .7;
}

#tutorPage .message.assistant {
  border-color: #33415f;
  background: linear-gradient(145deg, #17233b, #121b30);
}

#tutorPage .message.assistant::before {
  content: "辅导老师";
  color: var(--cyan);
}

#tutorPage .message.user {
  border-color: #42e8d044;
  background: linear-gradient(145deg, #216c6a, #194f59);
}

#tutorPage .message.user::before {
  content: "李国正";
  text-align: right;
}

.tutor-input-dock {
  position: sticky;
  z-index: 19;
  bottom: 92px;
  padding: 8px 0 2px;
  background: linear-gradient(180deg, transparent, #080c18 24%);
}

.quick-prompts {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 6px 2px 10px;
  scrollbar-width: none;
}

.quick-prompts::-webkit-scrollbar {
  display: none;
}

.quick-prompts button {
  min-height: 38px;
  padding: 8px 12px;
  white-space: nowrap;
  background: #111a2f;
  border: 1px solid var(--line);
}

.chat-compose {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 48px;
  align-items: end;
  gap: 8px;
  padding: 7px;
  border: 1px solid #344260;
  border-radius: 18px;
  background: #10182ef2;
  box-shadow: 0 12px 34px #0008;
  backdrop-filter: blur(16px);
}

.chat-compose textarea {
  min-height: 50px;
  max-height: 132px;
  resize: none;
  border: 0;
  padding: 14px 11px 10px;
  background: transparent;
}

.chat-compose textarea:focus-visible {
  outline: none;
}

.tutor-send {
  display: grid;
  place-items: center;
  width: 46px;
  min-width: 46px;
  height: 46px;
  padding: 0;
  border-radius: 50%;
  font-size: 18px;
}

.tutor-send span {
  transform: translateX(1px) rotate(-12deg);
}

.verify-box {
  margin-top: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #10182ef2;
}

nav {
  bottom: calc(14px + env(safe-area-inset-bottom));
  transition: transform .2s ease;
}

@media (max-width: 650px) {
  .app {
    padding-bottom: calc(94px + env(safe-area-inset-bottom));
  }

  .app.compact-page > main {
    padding-top: 14px;
  }

  .tutor-page-shell {
    gap: 11px;
  }

  .tutor-page-head {
    padding-inline: 2px;
  }

  .tutor-context-card {
    padding: 11px 13px;
    border-radius: 17px;
  }

  .tutor-context-summary {
    min-height: 58px;
  }

  .tutor-context-editor {
    grid-template-columns: 1fr;
    padding-top: 12px;
  }

  .tutor-context-editor textarea {
    min-height: 88px;
  }

  .tutor-context-editor .primary {
    min-height: 46px;
  }

  #tutorPage .chat-box {
    height: calc(100dvh - var(--tutor-dock-height, 124px) - 250px);
    min-height: 270px;
    max-height: none;
    padding-bottom: 12px;
  }

  #tutorPage .message {
    max-width: 91%;
  }

  .tutor-input-dock {
    position: fixed;
    left: 50%;
    bottom: calc(92px + env(safe-area-inset-bottom));
    width: min(620px, calc(100% - 28px));
    padding: 8px 2px 5px;
    transform: translateX(-50%);
  }

  .chat-compose textarea {
    font-size: 16px;
  }

  #tutorPage.active {
    animation: none;
    padding-bottom: calc(var(--tutor-dock-height, 124px) + 94px + env(safe-area-inset-bottom));
  }

  body.tutor-keyboard-open nav {
    transform: translate(-50%, calc(100% + 36px));
    pointer-events: none;
  }

  body.tutor-keyboard-open .tutor-input-dock {
    bottom: calc(8px + env(safe-area-inset-bottom));
  }

  body.tutor-keyboard-open #tutorPage .chat-box {
    height: 40dvh;
  }
}

@media (max-width: 390px) {
  .tutor-context-heading b {
    max-width: 170px;
  }

  .quick-prompts button {
    font-size: 11px;
  }
}

/* v1.2.8: 理解反馈、错题卡片与桌面工作台响应式布局。 */
.verify-box {
  display: grid;
  gap: 10px;
}

.verify-copy {
  display: grid;
  gap: 4px;
}

.verify-copy > span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.verify-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.verify-actions button {
  min-width: 0;
  min-height: 44px;
}

.desktop-nav-brand {
  display: none;
}

.wrong-page-layout {
  display: grid;
  gap: 14px;
}

.wrong-overview {
  display: none;
}

.wrong-card {
  display: block;
  padding: 0;
  overflow: hidden;
}

.wrong-card-main {
  min-width: 0;
  padding: 20px;
}

.wrong-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.wrong-card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--muted);
  font-size: 13px;
}

.wrong-card-meta span + span::before {
  content: "·";
  margin-right: 10px;
  color: #60708e;
}

.wrong-date {
  flex: 0 0 auto;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: #c8d2e6;
  font-size: 12px;
}

.wrong-date.due {
  border-color: #42e8d077;
  background: #42e8d00c;
  color: var(--cyan);
}

.wrong-prompt {
  max-width: none;
  margin: 18px 0 0 !important;
  overflow-wrap: anywhere;
  font-size: 18px;
  line-height: 1.75;
}

.wrong-prompt.is-clamped {
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
}

.wrong-expand {
  margin-top: 8px;
  padding-left: 0;
}

.wrong-divider {
  height: 1px;
  margin: 16px 0;
  background: var(--line);
}

.wrong-streak {
  display: flex;
  align-items: center;
  gap: 16px;
}

.wrong-streak-dots {
  display: inline-flex;
  gap: 10px;
}

.wrong-streak-dots i {
  display: block;
  width: 14px;
  height: 14px;
  border: 2px solid #8491ab;
  border-radius: 50%;
}

.wrong-streak-dots i.is-filled {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 12px #42e8d055;
}

.wrong-action {
  display: grid;
  gap: 8px;
  margin-top: 16px;
  text-align: center;
}

.wrong-action > button {
  min-height: 48px;
}

.wrong-action small {
  color: var(--muted);
  line-height: 1.5;
}

.wrong-warm-note {
  display: block;
  padding: 12px;
  border: 1px solid #47d78744;
  border-radius: 12px;
  background: #47d7870d;
}

.wrong-overview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 18px 0;
}

.wrong-overview-grid span {
  display: grid;
  gap: 4px;
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #0a1020;
  text-align: center;
}

.wrong-overview-grid b {
  color: var(--cyan);
  font-size: 24px;
}

.wrong-overview-grid small {
  color: var(--muted);
  font-size: 11px;
}

.wrong-overview > p:last-child {
  margin: 0;
  line-height: 1.7;
}

@media (min-width: 1050px) {
  .app {
    width: min(1280px, calc(100% - 260px));
    margin-right: 20px;
    margin-left: max(240px, calc((100vw - 1280px + 210px) / 2));
    padding: 0 0 48px;
  }

  .app > header {
    padding: 28px 2px 22px;
  }

  .app.compact-page > main {
    padding-top: 18px;
  }

  #studentNav {
    top: 18px;
    right: auto;
    bottom: 18px;
    left: 18px;
    width: 196px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    transform: none;
    border-radius: 24px;
  }

  .desktop-nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    padding: 8px;
  }

  .desktop-nav-brand > span {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--cyan), var(--purple));
    color: #071019;
    font-size: 18px;
    font-weight: 950;
  }

  .desktop-nav-brand div {
    display: grid;
    gap: 2px;
  }

  .desktop-nav-brand b {
    font-size: 15px;
  }

  .desktop-nav-brand small {
    color: var(--muted);
    font-size: 10px;
  }

  #studentNav button {
    grid-template-columns: 30px 1fr;
    place-items: center start;
    gap: 10px;
    min-height: 50px;
    padding: 9px 12px;
    text-align: left;
    font-size: 13px;
  }

  #studentNav button span {
    font-size: 21px;
  }

  #studentNav button.active {
    box-shadow: inset 3px 0 0 var(--cyan);
  }

  #homePage.page.active {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(310px, .72fr);
    gap: 22px 24px;
  }

  #homePage > .hero {
    grid-column: 1;
    grid-row: 1;
    min-height: 220px;
  }

  #homePage > .home-checkin {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: start;
  }

  #homePage > .home-tasks {
    grid-column: 1;
    grid-row: 2;
  }

  #homePage > .home-mastery {
    grid-column: 1 / -1;
    grid-row: 3;
  }

  #homePage .section-head {
    margin-top: 0;
  }

  #diagnosisPage,
  #knowledgePage,
  #parentPage {
    width: 100%;
  }

  #diagnosisPage .question-card {
    padding: 28px;
  }

  #diagnosisPage .question-card h3 {
    max-width: 980px;
    font-size: 22px;
  }

  .subject-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  #tutorPage {
    width: 100%;
  }

  .tutor-page-shell {
    grid-template-columns: minmax(280px, 330px) minmax(0, 1fr);
    align-items: start;
    gap: 18px 24px;
  }

  .tutor-page-head {
    grid-column: 1 / -1;
  }

  .tutor-context-card {
    position: sticky;
    top: 24px;
    grid-column: 1;
    grid-row: 2 / span 2;
  }

  .tutor-context-editor {
    grid-template-columns: 1fr;
  }

  .tutor-context-editor .primary {
    width: 100%;
  }

  #tutorPage .chat-box {
    grid-column: 2;
    grid-row: 2;
    min-height: 520px;
    height: min(62vh, 680px);
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #090f1ded;
  }

  .tutor-input-dock {
    position: sticky;
    bottom: 20px;
    grid-column: 2;
    grid-row: 3;
    padding-top: 4px;
  }

  .wrong-page-layout {
    grid-template-columns: minmax(0, 1fr) 286px;
    align-items: start;
    gap: 22px;
  }

  .wrong-overview {
    display: block;
    position: sticky;
    top: 24px;
    grid-column: 2;
    grid-row: 1;
  }

  .wrong-overview-grid {
    grid-template-columns: 1fr;
  }

  .wrong-card-main {
    padding: 24px 26px;
  }

  .wrong-prompt {
    font-size: 19px;
  }

  .wrong-action {
    text-align: left;
  }

  .wrong-action > button {
    width: min(420px, 100%);
  }

  .wrong-action small {
    max-width: 520px;
  }

  #knowledgePage .knowledge-row {
    grid-template-columns: minmax(0, 1fr) 180px 58px;
    padding: 14px 16px;
  }
}

@media (max-width: 650px) {
  .verify-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .verify-actions button {
    padding: 10px 6px;
    font-size: 13px;
  }

  .wrong-card-main {
    padding: 17px;
  }

  .wrong-card-head {
    gap: 10px;
  }

  .wrong-card-meta {
    gap: 7px;
    font-size: 12px;
  }

  .wrong-card-meta span + span::before {
    margin-right: 7px;
  }

  .wrong-date {
    padding: 5px 8px;
  }

  .wrong-prompt {
    font-size: 17px;
    line-height: 1.7;
  }

  .wrong-action > button {
    min-height: 50px;
  }
}