:root {
  --student: #4f46e5;
  --student-deep: #3730a3;
  --student-soft: #eef2ff;
  --teacher: #0d9488;
  --teacher-deep: #0f766e;
  --teacher-soft: #ecfdf5;
  --primary: var(--student);
  --primary-deep: var(--student-deep);
  --primary-soft: var(--student-soft);
  --ink: #1f2430;
  --sub: #6f7785;
  --line: #e6eaf2;
  --bg: #f5f7fb;
  --card: #ffffff;
  --green: #16a34a;
  --red: #dc2626;
  --amber: #d97706;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

button {
  cursor: pointer;
}

.sidebar {
  width: 248px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--card);
  border-right: 1px solid var(--line);
  position: sticky;
  top: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 22px;
  border-bottom: 1px solid var(--line);
}

.logo {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
}

.brand-name {
  font-size: 16px;
  font-weight: 800;
}

.brand-sub,
.profile-role,
.breadcrumb,
.muted {
  color: var(--sub);
}

.brand-sub {
  margin-top: 2px;
  font-size: 11px;
}

.role-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 16px 18px;
}

.role-switch button {
  border: 0;
  border-radius: 10px;
  padding: 9px 0;
  color: var(--sub);
  background: #eef0f5;
  font-weight: 700;
}

.role-switch button.active {
  color: #fff;
  background: var(--primary);
}

.nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 12px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  margin-bottom: 4px;
  padding: 11px 13px;
  border: 0;
  border-radius: 11px;
  background: transparent;
  color: #525a68;
  font-weight: 700;
  text-align: left;
}

.nav-item:hover {
  background: var(--bg);
}

.nav-item.active {
  color: var(--primary-deep);
  background: var(--primary-soft);
}

.profile {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 14px 18px;
  border-top: 1px solid var(--line);
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--primary-deep);
  background: var(--primary-soft);
  font-weight: 800;
}

.profile-name {
  font-size: 13.5px;
  font-weight: 800;
}

.profile-role {
  margin-top: 2px;
  font-size: 11px;
}

.main {
  min-width: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.topbar {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 5;
}

.page-title {
  font-size: 18px;
  font-weight: 800;
}

.breadcrumb {
  margin-top: 3px;
  font-size: 12px;
}

.content {
  flex: 1;
  padding: 26px 28px;
  overflow: auto;
}

.api-state {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 7px 11px;
  color: var(--sub);
  background: var(--bg);
  font-size: 12px;
  font-weight: 700;
}

.api-state.ok {
  color: var(--green);
  background: #ecfdf5;
}

.api-state.bad {
  color: var(--red);
  background: #fef2f2;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid-2 {
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, .8fr);
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.kpi-clickable {
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color .15s, transform .15s;
}

.kpi-clickable:hover {
  transform: translateY(-2px);
}

.kpi-clickable.active {
  border-color: var(--primary);
}

.card,
.kpi {
  background: var(--card);
  border-radius: 16px;
  box-shadow: 0 2px 12px rgba(31, 36, 48, .05);
}

.card {
  padding: 18px 20px;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-size: 15px;
  font-weight: 800;
}

.card-title::before {
  content: "";
  width: 4px;
  height: 15px;
  border-radius: 3px;
  background: var(--primary);
}

.kpi {
  padding: 18px 20px;
}

.kpi-label {
  color: var(--sub);
  font-size: 13px;
  font-weight: 700;
}

.kpi-value {
  margin-top: 6px;
  font-size: 30px;
  font-weight: 800;
}

.books {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 18px 14px;
}

.book {
  min-width: 0;
}

.cover {
  height: 204px;
  display: grid;
  place-items: center;
  padding: 14px;
  border-radius: 13px;
  color: #fff;
  font-size: 15px;
  font-weight: 800;
  line-height: 1.4;
  text-align: center;
  box-shadow: 0 5px 16px rgba(31, 36, 48, .13);
}

.book-title {
  margin-top: 10px;
  font-size: 13.5px;
  font-weight: 800;
}

.book-author {
  margin-top: 3px;
  color: var(--sub);
  font-size: 11.5px;
}

.progress {
  height: 6px;
  margin-top: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: #eef0f5;
}

.progress span {
  display: block;
  height: 100%;
  background: var(--primary);
}

.progress span.done {
  background: var(--green);
}

.book-progress {
  margin-top: 6px;
  display: grid;
  gap: 6px;
  justify-items: start;
}

.book-progress .badge {
  padding: 2px 8px;
  font-size: 11px;
}

.book-progress .progress {
  width: 100%;
  margin-top: 0;
}

.task-list {
  display: grid;
  gap: 12px;
}

.mindmap-list {
  display: grid;
  gap: 12px;
}

.mindmap-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px;
  border-radius: 13px;
  background: var(--bg);
}

.mindmap-card-main {
  min-width: 0;
  flex: 1;
}

.mindmap-instruction {
  margin-top: 8px;
  border-left: 3px solid var(--primary);
  padding: 7px 10px;
  color: #3e4653;
  background: #fff;
  border-radius: 8px;
  font-size: 12.5px;
  line-height: 1.55;
}

.compact-actions {
  margin-top: 0;
}

.task {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px;
  border-radius: 13px;
  background: var(--bg);
}

.task-main {
  min-width: 0;
  flex: 1;
}

.task-name {
  font-weight: 800;
}

.task-meta {
  margin-top: 4px;
  color: var(--sub);
  font-size: 12px;
  line-height: 1.55;
}

.task-battle {
  margin-top: 8px;
  border: 1px solid rgba(44, 123, 229, .18);
  border-radius: 10px;
  padding: 8px 11px;
  color: #23324d;
  background: #eef5ff;
  font-size: 12.5px;
  line-height: 1.55;
}

.task-battle b {
  color: var(--primary-deep);
}

.task-battle.locked,
.task-battle.pending {
  color: var(--sub);
  background: #fff;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 5px 10px;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 800;
}

.badge.todo {
  color: var(--amber);
  background: #fff7ed;
}

.badge.done {
  color: var(--green);
  background: #ecfdf5;
}

.badge.graded {
  color: var(--primary-deep);
  background: var(--primary-soft);
}

.badge.pub {
  color: var(--green);
  background: #ecfdf5;
}

.badge.unpub {
  color: var(--sub);
  background: #eef0f5;
}

.task-clickable {
  cursor: pointer;
}

.task-clickable:hover {
  box-shadow: 0 4px 14px rgba(31, 36, 48, .08);
}

.quiz-content {
  font-family: inherit;
}

.quiz-item {
  margin-bottom: 18px;
  border-radius: 13px;
  padding: 16px;
  background: var(--bg);
}

.quiz-stem {
  font-weight: 800;
  font-size: 14.5px;
  line-height: 1.7;
}

.quiz-full {
  color: var(--sub);
  font-size: 12px;
  font-weight: 700;
}

.quiz-options {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 12px;
  background: #fff;
  font-size: 13.5px;
  cursor: pointer;
}

.quiz-option:has(input:checked) {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.quiz-option input {
  margin-top: 2px;
  accent-color: var(--primary);
}

.quiz-answer {
  width: 100%;
  margin-top: 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
  resize: vertical;
}

.quiz-result {
  margin-top: 10px;
  border-radius: 10px;
  padding: 10px 13px;
  background: #fff;
  border: 1px dashed var(--line);
}

.quiz-tag {
  font-size: 12.5px;
  font-weight: 800;
}

.quiz-tag.right {
  color: var(--green);
}

.quiz-tag.wrong {
  color: var(--red);
}

.quiz-tag.subjective {
  color: var(--amber);
}

.quiz-ref {
  margin-top: 6px;
  color: var(--sub);
  font-size: 12.5px;
  line-height: 1.7;
}

.quiz-score {
  margin-bottom: 16px;
  border-left: 4px solid var(--primary);
  border-radius: 12px;
  padding: 12px 14px;
  color: var(--primary-deep);
  background: var(--primary-soft);
  font-size: 14px;
}

.qb-menu {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
  padding: 6px;
  border-radius: 14px;
  background: var(--card);
  box-shadow: 0 2px 12px rgba(31, 36, 48, .05);
}

.qb-menu .res-tab {
  flex: initial;
  padding: 10px 18px;
}

.quiz-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 18px;
  align-items: start;
}

.paper {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 11px;
  border-radius: 13px;
  padding: 14px 16px;
  background: var(--bg);
}

.paper .pc {
  font-size: 22px;
}

.paper .pi {
  flex: 1;
  min-width: 0;
}

.paper .pn {
  font-size: 14.5px;
  font-weight: 800;
}

.paper .pm {
  margin-top: 4px;
  color: var(--sub);
  font-size: 11.5px;
}

.stat-mini {
  border-radius: 12px;
  padding: 14px;
  background: var(--bg);
  text-align: center;
}

.stat-mini .sv {
  color: var(--primary);
  font-size: 24px;
  font-weight: 800;
}

.stat-mini .sl {
  margin-top: 3px;
  color: var(--sub);
  font-size: 11.5px;
}

.wrong-item {
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
}

.wrong-item:last-child {
  border-bottom: 0;
}

.wrong-item summary {
  display: flex;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

.wrong-item summary::-webkit-details-marker {
  display: none;
}

.wrong-item .wk {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border-radius: 9px;
  color: var(--red);
  background: #fff1ef;
  font-size: 13px;
  font-weight: 800;
}

.wrong-item .wt {
  flex: 1;
  min-width: 0;
}

.wrong-item .q {
  display: block;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
}

.wrong-item .t {
  display: block;
  margin-top: 4px;
  color: var(--sub);
  font-size: 11.5px;
}

.wrong-detail {
  margin: 8px 0 4px 44px;
  border-radius: 9px;
  padding: 10px 12px;
  color: var(--sub);
  background: var(--bg);
  font-size: 12.5px;
  line-height: 1.8;
}

@media (max-width: 880px) {
  .quiz-layout {
    grid-template-columns: 1fr;
  }
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.field.full {
  grid-column: 1 / -1;
}

.field label {
  font-size: 12px;
  font-weight: 800;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--ink);
  background: #fff;
  outline: none;
}

.field textarea {
  min-height: 92px;
  resize: vertical;
}

.field-hint {
  color: var(--sub);
  font-size: 12px;
  line-height: 1.6;
}

.primary-button,
.ghost-button,
.danger-button {
  border-radius: 11px;
  padding: 10px 16px;
  font-weight: 800;
}

.primary-button {
  border: 0;
  color: #fff;
  background: var(--primary);
}

.ghost-button {
  border: 1px solid var(--primary);
  color: var(--primary-deep);
  background: #fff;
}

.danger-button {
  border: 1px solid #dc2626;
  color: #b91c1c;
  background: #fff;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.notice {
  margin-bottom: 14px;
  border-left: 4px solid var(--primary);
  border-radius: 12px;
  padding: 12px 14px;
  color: var(--primary-deep);
  background: var(--primary-soft);
  font-size: 13px;
  line-height: 1.7;
}

.question-import-guide {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: #fff;
}

.guide-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.guide-title {
  font-size: 14px;
  font-weight: 800;
}

.guide-title.small {
  font-size: 13px;
}

.guide-sub {
  margin-top: 4px;
  color: var(--sub);
  font-size: 12px;
  line-height: 1.6;
}

.question-guide-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .9fr);
  gap: 14px;
  align-items: start;
}

.question-template-preview {
  min-height: 320px;
  max-height: 430px;
  margin: 0;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 13px 14px;
  color: #243042;
  background: #f8fafc;
  white-space: pre-wrap;
  font: 12.5px/1.75 ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

.recognition-panel {
  display: grid;
  gap: 12px;
}

.recognition-rules {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
  color: #3e4653;
  font-size: 12.5px;
  line-height: 1.65;
}

.empty {
  padding: 28px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  color: var(--sub);
  text-align: center;
  background: #fff;
}

.kpi-unit {
  margin-left: 4px;
  color: var(--sub);
  font-size: 15px;
  font-weight: 700;
}

.kpi-sub {
  margin-top: 6px;
  color: var(--sub);
  font-size: 12px;
}

.fold {
  border-radius: 13px;
  background: var(--bg);
}

.fold-summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

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

.fold-head {
  flex: 1;
  min-width: 0;
}

.fold-arrow {
  flex-shrink: 0;
  color: var(--sub);
  font-size: 18px;
  font-weight: 800;
  transition: transform .15s;
}

.fold[open] > .fold-summary .fold-arrow {
  transform: rotate(90deg);
}

.fold-body {
  padding: 0 14px 14px;
}

.chapter-manager {
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.chapter-manager-summary {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 9px 12px;
  list-style: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 800;
}

.chapter-manager-summary::-webkit-details-marker {
  display: none;
}

.chapter-manager-count {
  margin-left: auto;
  color: var(--sub);
  font-size: 12px;
  font-weight: 600;
}

.chapter-manager[open] .fold-arrow {
  transform: rotate(90deg);
}

.chapter-manager-list {
  display: grid;
  max-height: 360px;
  overflow-y: auto;
  border-top: 1px solid var(--line);
  padding: 6px;
}

.chapter-manager-item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  align-items: center;
  gap: 9px;
  min-height: 42px;
  border-radius: 7px;
  padding: 6px 8px;
  color: #4b5563;
  font-size: 12.5px;
}

.chapter-manager-item:hover {
  background: var(--bg);
}

.chapter-manager-item.key {
  color: #854d0e;
  background: #fffbeb;
}

.chapter-manager-index {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  color: var(--sub);
  background: var(--bg);
  font-size: 11px;
  font-weight: 800;
}

.chapter-manager-title {
  min-width: 0;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.chapter-key-control {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
}

.chapter-key-control input {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: #d97706;
}

.chapter-manager-empty {
  margin: 6px;
  padding: 18px;
}

.stu-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.stu-chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px;
  background: #fff;
  color: var(--ink);
  font-size: 12px;
}

.muted-chip {
  color: var(--sub);
  background: #eef0f5;
}

.class-create-card {
  margin-bottom: 18px;
}

.class-board-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  margin: 4px 0 12px;
}

.class-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

.class-card-grid > .empty {
  grid-column: 1 / -1;
}

.class-card {
  display: grid;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 4px 16px rgba(31, 36, 48, .05);
}

.class-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.class-card-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
}

.class-desc {
  margin-top: 5px;
  color: var(--sub);
  font-size: 12px;
  line-height: 1.55;
}

.class-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.class-stats div {
  border-radius: 12px;
  padding: 10px 12px;
  background: var(--bg);
}

.class-stats b,
.class-stats span {
  display: block;
}

.class-stats b {
  font-size: 20px;
}

.class-stats span {
  margin-top: 2px;
  color: var(--sub);
  font-size: 12px;
}

.student-preview {
  min-height: 34px;
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 8px;
}

.chk-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chk {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 14px;
  background: var(--bg);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

.chk:has(input:checked) {
  border-color: var(--primary);
  color: var(--primary-deep);
  background: var(--primary-soft);
}

.chk input {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

.task-audience-picker {
  display: grid;
  gap: 10px;
}

.task-audience-class {
  display: grid;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: #fff;
}

.task-audience-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.task-audience-head > span {
  color: var(--sub);
  font-size: 12px;
  white-space: nowrap;
}

.task-audience-whole {
  flex: 1;
  min-width: 0;
  background: var(--primary-soft);
}

.task-audience-students {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-left: 26px;
}

.task-audience-student {
  background: var(--bg);
}

.tw-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 11px;
  padding: 15px 16px;
  border-radius: 13px;
  background: var(--bg);
}

.tw-main {
  flex: 1;
  min-width: 0;
}

.tw-name {
  font-size: 15px;
  font-weight: 800;
}

.tw-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 5px;
  color: var(--sub);
  font-size: 11.5px;
}

.tw-stats {
  display: flex;
  flex-shrink: 0;
  gap: 18px;
  text-align: center;
}

.tw-stat .vs {
  font-size: 16px;
  font-weight: 800;
}

.tw-stat .ls {
  margin-top: 2px;
  color: var(--sub);
  font-size: 10.5px;
}

.tw-acts {
  display: flex;
  flex-shrink: 0;
  gap: 8px;
}

.tw-btn {
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 8px 13px;
  color: var(--sub);
  background: #fff;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
}

.tw-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.tw-btn.danger:hover {
  border-color: var(--red);
  color: var(--red);
}

.task-detail-modal {
  display: flex;
  width: min(1120px, 100%);
  height: min(94vh, 940px);
  max-height: calc(100vh - 32px);
  flex-direction: column;
  overflow: hidden;
}

.task-detail-modal .modal-head {
  flex-shrink: 0;
}

.task-detail-modal .modal-body {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 20px 24px 24px;
}

.task-detail-content {
  display: grid;
  gap: 20px;
}

.task-detail-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
}

.task-detail-metric {
  display: grid;
  gap: 6px;
  min-width: 0;
  padding: 14px 16px;
  border-left: 1px solid var(--line);
}

.task-detail-metric:first-child {
  border-left: 0;
}

.task-detail-metric span {
  color: var(--sub);
  font-size: 12px;
  font-weight: 700;
}

.task-detail-metric b {
  font-size: 22px;
}

.task-detail-chips {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}

.task-detail-chips > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
  background: #fff;
}

.task-detail-chips.compact > div {
  background: var(--bg);
}

.task-detail-chips span {
  color: var(--sub);
  font-size: 12px;
  font-weight: 700;
}

.task-detail-chips b {
  color: var(--ink);
  font-size: 13px;
  white-space: nowrap;
}

.task-detail-section {
  padding-top: 2px;
}

.task-detail-section + .task-detail-section {
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.task-detail-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 12px;
}

.task-detail-section-title {
  font-size: 14px;
  font-weight: 800;
}

.task-detail-info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.task-detail-info-grid > div {
  display: grid;
  gap: 5px;
  min-width: 0;
  padding: 11px 13px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.task-detail-info-grid > div:nth-child(3n) {
  border-right: 0;
}

.task-detail-info-grid > div:nth-last-child(-n + 3) {
  border-bottom: 0;
}

.task-detail-info-grid span,
.task-detail-requirement > span {
  color: var(--sub);
  font-size: 11px;
  font-weight: 700;
}

.task-detail-info-grid b {
  overflow-wrap: anywhere;
  font-size: 12.5px;
  line-height: 1.5;
}

.task-detail-requirement {
  margin-top: 10px;
  padding: 11px 13px;
  border-left: 3px solid var(--primary);
  border-radius: 6px;
  background: var(--primary-soft);
}

.task-detail-requirement p {
  margin: 5px 0 0;
  font-size: 13px;
  line-height: 1.7;
}

.task-score-chart {
  display: grid;
  gap: 9px;
}

.task-score-row {
  display: grid;
  grid-template-columns: 62px minmax(100px, 1fr) 48px;
  gap: 10px;
  align-items: center;
  font-size: 12px;
}

.task-score-row > span:first-child,
.task-score-row b {
  font-weight: 700;
}

.task-score-row b {
  text-align: right;
}

.task-score-track {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--line);
}

.task-score-track span {
  display: block;
  height: 100%;
  min-width: 0;
  border-radius: 999px;
  background: var(--primary);
}

.task-error-list {
  display: grid;
  gap: 10px;
}

.task-error-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 13px;
  background: var(--bg);
}

.task-error-main {
  display: grid;
  min-width: 0;
  gap: 5px;
}

.task-error-main b {
  color: var(--ink);
  font-size: 13px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.task-error-main span,
.task-error-rate span {
  color: var(--sub);
  font-size: 12px;
  line-height: 1.5;
}

.task-error-rate {
  flex-shrink: 0;
  min-width: 82px;
  text-align: right;
}

.task-error-rate b {
  display: block;
  color: var(--red);
  font-size: 20px;
}

.task-detail-student-table {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.task-detail-student-entry {
  min-width: 900px;
  border-top: 1px solid var(--line);
}

.task-detail-student-row {
  display: grid;
  grid-template-columns: minmax(150px, 1.1fr) minmax(110px, .8fr) minmax(96px, .75fr) minmax(80px, .6fr) minmax(260px, 1.8fr);
  gap: 10px;
  align-items: center;
  min-width: 900px;
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
}

.task-detail-student-entry .task-detail-student-row {
  border-top: 0;
}

.task-detail-student-row:first-child {
  border-top: 0;
}

.task-detail-student-head {
  color: var(--sub);
  background: var(--bg);
  font-weight: 800;
}

.task-detail-student {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.task-detail-avatar {
  display: grid;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  place-items: center;
  border-radius: 50%;
  color: var(--primary-deep);
  background: var(--primary-soft);
  font-weight: 800;
}

.task-detail-comment {
  overflow-wrap: anywhere;
  color: var(--sub);
  line-height: 1.5;
  white-space: normal;
}

.task-detail-student-submission {
  padding: 0 12px 12px 49px;
}

.task-detail-student-submission > summary {
  display: inline-flex;
  align-items: center;
  margin-top: 2px;
  color: var(--primary-deep);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  list-style: none;
}

.task-detail-student-submission > summary::-webkit-details-marker {
  display: none;
}

.task-detail-student-submission .submission-review {
  background: #f8fafc;
}

.compact-empty {
  padding: 16px;
  font-size: 12.5px;
}

.eval-tag {
  border-radius: 7px;
  padding: 4px 10px;
  color: var(--primary-deep);
  background: var(--primary-soft);
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

.toast {
  position: fixed;
  top: 76px;
  left: 50%;
  z-index: 60;
  padding: 11px 22px;
  border-radius: 999px;
  color: #fff;
  background: var(--green);
  box-shadow: 0 10px 26px rgba(22, 163, 74, .28);
  font-size: 13.5px;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -12px);
  transition: opacity .2s, transform .2s;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.confirm-list {
  display: grid;
  gap: 9px;
}

.confirm-row {
  display: flex;
  gap: 14px;
  border-radius: 10px;
  padding: 10px 13px;
  background: var(--bg);
  font-size: 13px;
  line-height: 1.6;
}

.confirm-key {
  flex-shrink: 0;
  width: 64px;
  color: var(--sub);
  font-weight: 700;
}

.cover-clickable {
  cursor: pointer;
  transition: transform .15s, box-shadow .15s;
}

.primary-button:disabled,
.ghost-button:disabled,
.danger-button:disabled,
.chat-input-row textarea:disabled {
  cursor: not-allowed;
  opacity: .55;
}

.cover-clickable:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 22px rgba(31, 36, 48, .22);
}

.reader-overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  padding: 22px;
  background: rgba(17, 24, 39, .45);
}

.reader {
  display: flex;
  height: 100%;
  overflow: hidden;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 24px 64px rgba(17, 24, 39, .3);
}

.reader-side {
  display: flex;
  flex-direction: column;
  width: 264px;
  flex-shrink: 0;
  border-right: 1px solid var(--line);
  background: var(--bg);
}

.reader-book {
  padding: 18px 18px 12px;
  font-size: 15px;
  font-weight: 800;
}

.reader-key-legend {
  margin-top: 7px;
  color: #a16207;
  font-size: 11.5px;
  font-weight: 700;
}

.reader-chapters {
  flex: 1;
  overflow-y: auto;
  padding: 0 10px 14px;
}

.reader-chapter {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  width: 100%;
  margin-bottom: 4px;
  border: 0;
  border-radius: 9px;
  padding: 9px 11px;
  color: #525a68;
  background: transparent;
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
}

.reader-chapter-title {
  min-width: 0;
  flex: 1;
  overflow-wrap: anywhere;
}

.reader-chapter.key {
  border-left: 3px solid #eab308;
  color: #854d0e;
  background: #fffbeb;
}

.reader-key-badge {
  flex-shrink: 0;
  border-radius: 4px;
  padding: 1px 5px;
  color: #854d0e;
  background: #fef3c7;
  font-size: 10px;
  font-weight: 800;
  white-space: nowrap;
}

.reader-chapter:hover {
  background: #fff;
}

.reader-chapter.key:hover {
  background: #fff7d6;
}

.reader-chapter.active {
  color: var(--primary-deep);
  background: var(--primary-soft);
}

.reader-chapter.key.active {
  border-left-color: #d97706;
}

.reader-main {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
}

.reader-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
}

.reader-title {
  font-size: 15px;
  font-weight: 800;
}

.reader-content {
  flex: 1;
  overflow-y: auto;
  padding: 26px 34px;
  font-family: "Songti SC", "SimSun", serif;
  font-size: 15.5px;
  line-height: 2;
  white-space: pre-wrap;
}

.reader-loading {
  padding: 30px 14px;
  color: var(--sub);
  font-size: 13px;
  text-align: center;
}

.kp-thumb {
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid var(--line);
}

.kp-text {
  font-size: 14.5px;
  line-height: 1.9;
}

.kp-file {
  margin-top: 16px;
}

.kp-preview-img {
  max-width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
}

.kp-preview-frame {
  width: 100%;
  height: calc(100vh - 220px);
  min-height: 420px;
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.kp-file-tip {
  margin: 16px 0 10px;
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  padding: 10px 13px;
  color: var(--primary-deep);
  background: var(--primary-soft);
  font-size: 13px;
  font-weight: 700;
}

.kp-download {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.chk-sm {
  padding: 7px 11px;
  font-size: 12px;
}

.picker-box {
  max-height: 132px;
  overflow-y: auto;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 10px;
}

#taskQuestionPicker.picker-box {
  max-height: 240px;
}

.task-question-bank-picker {
  display: grid;
  gap: 10px;
  width: 100%;
}

.task-question-bank-bar {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
}

.task-question-bank-bar label {
  color: var(--sub);
  font-size: 12px;
  font-weight: 800;
}

.task-question-bank-bar select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 11px;
  color: var(--ink);
  background: #fff;
}

.task-question-bank-questions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.task-question-item span {
  line-height: 1.45;
}

@media (max-width: 880px) {
  .reader-overlay {
    padding: 0;
  }

  .reader {
    border-radius: 0;
  }

  .reader-side {
    width: 180px;
  }

  .tw-row {
    flex-wrap: wrap;
  }
}

.res-tab-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
  padding: 6px;
  border-radius: 14px;
  background: var(--card);
  box-shadow: 0 2px 12px rgba(31, 36, 48, .05);
}

.res-tab {
  flex: 1;
  border: 0;
  border-radius: 10px;
  padding: 12px 0;
  color: var(--sub);
  background: transparent;
  font-size: 14.5px;
  font-weight: 800;
}

.res-tab:hover {
  background: var(--bg);
}

.res-tab.active {
  color: #fff;
  background: var(--primary);
}

.chat {
  display: grid;
  gap: 12px;
}

.bubble {
  max-width: 82%;
  border-radius: 14px;
  padding: 12px 14px;
  line-height: 1.7;
  font-size: 13.5px;
}

.bubble.me {
  justify-self: end;
  color: #fff;
  background: var(--primary);
}

.bubble.ai {
  justify-self: start;
  border-left: 3px solid var(--primary);
  background: var(--primary-soft);
}

.ai-layout {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  gap: 18px;
  align-items: start;
}

.ai-side {
  display: grid;
  gap: 18px;
}

.chat-card {
  display: flex;
  flex-direction: column;
}

.chat-head-actions {
  margin-left: auto;
  display: flex;
  gap: 8px;
}

.ai-mode-switch {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.ai-mode-pill {
  display: grid;
  gap: 4px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 13px;
  color: var(--ink);
  background: #fff;
  cursor: pointer;
}

.ai-mode-pill b {
  font-size: 13px;
}

.ai-mode-pill span {
  color: var(--sub);
  font-size: 12px;
}

.ai-mode-pill.active {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.ai-guided-note {
  margin-bottom: 10px;
}

.ai-status-list {
  display: grid;
  gap: 10px;
}

.ai-status-list div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
}

.ai-status-list div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.ai-status-list b {
  font-size: 12px;
}

.ai-status-list span {
  color: var(--sub);
  font-size: 12px;
  text-align: right;
}

.chat-scroll {
  flex: 1;
  min-height: 340px;
  max-height: 480px;
  overflow-y: auto;
  padding: 4px 2px;
  align-content: start;
}

.chat-input-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  align-items: flex-end;
}

.chat-input-row textarea {
  flex: 1;
  min-height: 44px;
  max-height: 120px;
  resize: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
  outline: none;
}

.chat-input-row textarea:focus {
  border-color: var(--primary);
}

.bubble.pending {
  opacity: .65;
  font-style: italic;
}

.bubble-cite {
  margin-top: 8px;
  font-size: 11.5px;
  opacity: .75;
}

.quick-actions {
  display: grid;
  gap: 10px;
}

.quick-action {
  display: grid;
  gap: 4px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: #fff;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
}

.quick-action span {
  font-size: 12px;
  font-weight: 400;
  color: var(--sub);
}

.quick-action:hover {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.record-list {
  display: grid;
  gap: 8px;
  max-height: 380px;
  overflow-y: auto;
}

.record-item {
  display: grid;
  gap: 4px;
  text-align: left;
  border: 0;
  border-radius: 10px;
  padding: 10px 12px;
  background: #f7f8fb;
  cursor: pointer;
}

.record-item:hover {
  background: var(--primary-soft);
}

.record-summary {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.record-meta {
  font-size: 11.5px;
  color: var(--sub);
}

.mindmap-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(18, 24, 38, .72);
  display: flex;
  padding: 24px;
}

.mindmap-editor {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  width: 100%;
  min-height: 0;
  border-radius: 16px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .24);
}

.mindmap-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  padding: 12px;
  background: #f8fafc;
}

.mindmap-toolbar input,
.mindmap-toolbar select {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--ink);
  background: #fff;
  outline: none;
}

.mindmap-toolbar input {
  min-width: 220px;
  font-weight: 800;
}

.mindmap-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  min-height: 0;
}

.mindmap-canvas-wrap {
  overflow: auto;
  background:
    linear-gradient(#eef2f8 1px, transparent 1px),
    linear-gradient(90deg, #eef2f8 1px, transparent 1px),
    #f8fafc;
  background-size: 28px 28px;
}

.mindmap-canvas {
  position: relative;
  min-width: 100%;
  min-height: 100%;
}

.mindmap-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.mindmap-lines path {
  fill: none;
  stroke: rgba(44, 123, 229, .38);
  stroke-width: 2.2;
}

.mindmap-node {
  position: absolute;
  width: 140px;
  min-height: 44px;
  border: 2px solid #c7d6ee;
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--ink);
  background: #fff;
  box-shadow: 0 6px 16px rgba(31, 42, 68, .08);
  font-weight: 800;
  line-height: 1.3;
  cursor: pointer;
}

.mindmap-node.root {
  border-color: var(--primary);
  color: #fff;
  background: var(--primary);
}

.mindmap-node.selected {
  box-shadow: 0 0 0 4px rgba(44, 123, 229, .18), 0 8px 18px rgba(31, 42, 68, .14);
}

.mindmap-inspector {
  display: grid;
  align-content: start;
  gap: 12px;
  border-left: 1px solid var(--line);
  padding: 14px;
  overflow: auto;
}

.mindmap-inspector .field span {
  font-size: 12px;
  font-weight: 800;
}

.mindmap-inspector textarea[readonly] {
  color: var(--sub);
  background: #f8fafc;
}

.task-grade {
  margin-top: 8px;
  display: grid;
  gap: 4px;
  border-left: 3px solid var(--green);
  border-radius: 8px;
  padding: 8px 12px;
  background: #ecfdf5;
  font-size: 12.5px;
}

.task-grade-score b {
  color: var(--green);
  font-size: 14px;
}

.task-grade-comment {
  color: var(--ink);
}

.submission-review {
  margin-top: 10px;
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 10px 12px;
  background: #fff;
  font-size: 12.5px;
}

.submission-review.empty-review {
  color: var(--sub);
}

.submission-review summary {
  cursor: pointer;
  list-style: none;
}

.submission-review summary::-webkit-details-marker {
  display: none;
}

.review-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--ink);
}

.review-head span {
  color: var(--sub);
  font-weight: 600;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 14px;
  margin-top: 8px;
  color: #3e4653;
}

.review-grid.compact {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.review-answers {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.review-answer {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.review-question {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: flex-start;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.review-options {
  display: grid;
  gap: 4px;
  margin-top: 7px;
  color: var(--sub);
}

.review-analysis {
  margin-top: 7px;
  color: var(--sub);
  line-height: 1.55;
}

.mindmap-review-tree {
  margin-top: 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  background: #f8fafc;
}

.mindmap-outline-node {
  margin: 5px 0;
}

.mindmap-outline-node > span {
  display: inline-flex;
  border: 1px solid rgba(44, 123, 229, .2);
  border-radius: 999px;
  padding: 4px 10px;
  background: #fff;
  color: var(--ink);
  font-weight: 700;
}

.mindmap-outline-children {
  margin-left: 20px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.grade-inputs {
  margin-top: 8px;
  display: flex;
  gap: 8px;
}

.grade-inputs input {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font: inherit;
  font-size: 12.5px;
  outline: none;
}

.grade-inputs .grade-score {
  width: 110px;
}

.grade-inputs .grade-comment {
  flex: 1;
}

.grade-inputs input:focus {
  border-color: var(--primary);
}

@media (max-width: 1080px) {
  .ai-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

.modal-mask {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(17, 24, 39, .32);
  z-index: 20;
}

.modal-mask.show {
  display: flex;
}

.modal {
  width: min(760px, 100%);
  max-height: 86vh;
  overflow: auto;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 22px 60px rgba(17, 24, 39, .2);
}

.modal-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
}

.modal-title {
  font-weight: 800;
}

.modal-sub {
  margin-top: 4px;
  color: var(--sub);
  font-size: 12px;
}

.modal-body {
  padding: 18px 20px 20px;
}

.notice.compact {
  margin: 0;
  padding: 10px 12px;
  font-size: 12.5px;
}

.student-manager {
  display: grid;
  gap: 14px;
}

.student-panel {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: #fff;
}

.student-panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.student-table {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.student-row {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) minmax(110px, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-width: 560px;
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.student-row:first-child {
  border-top: 0;
}

.student-row-head {
  color: var(--sub);
  background: var(--bg);
  font-weight: 800;
}

.student-inline-input {
  width: 100%;
  border: 1px solid transparent;
  border-radius: 9px;
  padding: 8px 9px;
  color: var(--text);
  background: var(--bg);
  font: inherit;
}

.student-inline-input:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.student-row-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.student-row-actions .ghost-button,
.student-row-actions .danger-button {
  padding: 7px 10px;
  border-radius: 9px;
  font-size: 12px;
}

.student-form-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.student-form-stack .form-grid {
  grid-template-columns: 1fr;
  margin-top: 10px;
}

.student-form-stack .button-row {
  margin-top: 0;
}

.icon-button {
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 10px;
  color: var(--sub);
  background: var(--bg);
  font-size: 22px;
  line-height: 1;
}

/* ===== 班级学情分层 ===== */
.analytics-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 13px 16px;
  margin-bottom: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.analytics-bar-label {
  color: var(--sub);
  font-size: 13px;
  font-weight: 700;
}

.analytics-bar-hint {
  color: var(--sub);
  font-size: 12px;
}

.analytics-bar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.analytics-select {
  min-width: 180px;
  max-width: 300px;
  border: 1px solid var(--primary);
  border-radius: 8px;
  padding: 9px 34px 9px 12px;
  color: var(--primary-deep);
  background-color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.analytics-rule-summary {
  margin-bottom: 12px;
  line-height: 1.6;
}

.analytics-donut-row {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.analytics-donut {
  width: 170px;
  height: 170px;
  flex-shrink: 0;
}

.analytics-seg {
  cursor: pointer;
  transition: opacity .2s, stroke-width .2s;
}

.analytics-seg:hover {
  opacity: .8;
}

.analytics-seg.active {
  stroke-width: 26;
}

.analytics-legend {
  display: flex;
  min-width: 190px;
  flex: 1;
  flex-direction: column;
  gap: 9px;
}

.analytics-legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  font-size: 13px;
  font-weight: 700;
  text-align: left;
}

.analytics-legend-item:hover,
.analytics-legend-item.active {
  border-color: var(--primary);
}

.analytics-legend-item.active {
  background: var(--primary-soft);
}

.analytics-legend-dot {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  border-radius: 3px;
}

.analytics-legend-value {
  margin-left: auto;
  color: var(--sub);
  font-weight: 600;
}

.analytics-unscored {
  margin-top: 10px;
}

.analytics-ai-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 14px;
  padding: 12px 13px;
  border: 1px solid rgba(44, 123, 229, .18);
  border-radius: 10px;
  background: var(--primary-soft);
}

.analytics-ai-title {
  color: var(--ink);
  font-weight: 800;
}

.analytics-ai-copy {
  margin-top: 3px;
  color: var(--sub);
  font-size: 12.5px;
  line-height: 1.5;
}

.ai-advice-modal {
  display: grid;
  gap: 14px;
}

.ai-advice-grid {
  display: grid;
  gap: 12px;
}

.ai-advice-block {
  border: 1px solid var(--line);
  border-left: 4px solid var(--primary);
  border-radius: 12px;
  padding: 13px 14px;
  background: #fff;
}

.ai-advice-title {
  color: var(--primary-deep);
  font-weight: 800;
}

.ai-advice-body {
  margin-top: 7px;
  color: #3e4653;
  font-size: 13px;
  line-height: 1.75;
}

.analytics-task-list {
  display: flex;
  max-height: 270px;
  overflow-y: auto;
  flex-direction: column;
  gap: 9px;
}

.analytics-task {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 62px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--bg);
  text-align: left;
}

.analytics-task:hover,
.analytics-task.active {
  border-color: var(--primary);
}

.analytics-task.active {
  background: var(--primary-soft);
}

.analytics-task-main {
  display: grid;
  min-width: 0;
  flex: 1;
  gap: 4px;
}

.analytics-table {
  margin-top: 12px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.analytics-row {
  display: grid;
  grid-template-columns: minmax(110px, 1.1fr) minmax(100px, 1fr) minmax(110px, 1fr) minmax(190px, 1.6fr) minmax(80px, .8fr);
  gap: 10px;
  align-items: center;
  min-width: 720px;
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.analytics-row:first-child {
  border-top: 0;
}

.analytics-row-head {
  color: var(--sub);
  background: var(--bg);
  font-weight: 800;
}

.analytics-score {
  display: flex;
  align-items: center;
  gap: 8px;
}

.analytics-score-bar {
  display: inline-block;
  height: 8px;
  overflow: hidden;
  flex: 1;
  border-radius: 999px;
  background: var(--line);
}

.analytics-score-bar > span {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.analytics-score-empty {
  color: var(--sub);
  font-size: 12px;
}

.analytics-clear {
  margin-left: 10px;
  padding: 4px 10px;
}

.badge.low {
  color: var(--red);
  background: #fef2f2;
}

.analytics-rule-form {
  display: grid;
  gap: 16px;
}

.analytics-rule-grid {
  margin: 0;
}

.analytics-rule-preview {
  padding: 12px 14px;
  border-left: 3px solid var(--primary);
  border-radius: 6px;
  color: #3e4653;
  background: var(--primary-soft);
  font-size: 13px;
  line-height: 1.65;
}

.analytics-rule-actions {
  justify-content: flex-end;
  margin-top: 0;
}

body.embed .sidebar,
body.embed .topbar {
  display: none;
}

body.embed .main {
  min-height: 100vh;
}

body.embed .content {
  padding: 20px;
}

@media (max-width: 880px) {
  body {
    display: block;
  }

  .sidebar {
    position: static;
    width: 100%;
    min-height: auto;
  }

  .nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
  }

  .nav-item {
    white-space: nowrap;
  }

  .profile {
    display: none;
  }

  .grid-2,
  .grid-3,
  .class-card-grid,
  .student-form-stack,
  .question-guide-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .guide-head {
    display: grid;
  }

  .mindmap-card,
  .mindmap-toolbar {
    display: grid;
    align-items: stretch;
  }

  .mindmap-body {
    grid-template-columns: 1fr;
  }

  .mindmap-inspector {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .topbar {
    position: static;
    padding: 0 18px;
  }

  .content {
    padding: 18px;
  }

  .analytics-bar {
    align-items: stretch;
  }

  .analytics-select {
    width: 100%;
    max-width: none;
  }

  .analytics-bar-actions {
    width: 100%;
    margin-left: 0;
    justify-content: space-between;
  }

  .analytics-donut-row {
    justify-content: center;
  }

  .task-detail-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .task-detail-metric:nth-child(3) {
    border-left: 0;
  }

  .task-detail-metric:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .task-detail-info-grid {
    grid-template-columns: 1fr;
  }

  .task-detail-info-grid > div,
  .task-detail-info-grid > div:nth-child(3n),
  .task-detail-info-grid > div:nth-last-child(-n + 3) {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .task-detail-info-grid > div:last-child {
    border-bottom: 0;
  }

  .task-detail-section-head {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .task-error-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .task-error-rate {
    width: 100%;
    text-align: left;
  }
}