.topbar,
.practice-topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  min-height: 3.75rem;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.wordmark,
.account-chip,
.practice-topbar > div {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.wordmark-icon img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.wordmark {
  color: var(--brand);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.wordmark-icon,
.empty-icon {
  width: 1.9rem;
  height: 1.9rem;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: var(--radius-sm);
  color: var(--white);
  background: var(--brand);
  font-size: 0.85rem;
  font-weight: 600;
}

.account-chip {
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.app-layout {
  min-height: calc(100vh - 3.75rem);
  display: grid;
  grid-template-columns: 17rem minmax(0, 1fr);
}

.group-rail {
  padding: 1.25rem 1rem;
  border-right: 1px solid var(--line);
  background: var(--white);
}

.rail-title,
.panel-heading,
.modal-heading,
.workspace-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.rail-title .eyebrow,
.panel-heading .eyebrow,
.workspace-heading .eyebrow,
.modal-heading .eyebrow {
  margin-bottom: 0.2rem;
}

.icon-button,
.text-button,
.secondary-button {
  border: 0;
  color: var(--ink-soft);
  background: transparent;
  font-weight: 600;
}

.icon-button {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--white);
  font-size: 1rem;
  line-height: 1;
}

.icon-button:hover {
  border-color: var(--line-strong);
  background: var(--paper);
}

.secondary-button {
  min-height: 2.4rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--white);
  font-size: 0.88rem;
}

.secondary-button:hover {
  background: var(--paper);
}

.text-button {
  padding: 0.3rem 0.35rem;
  font-size: 0.85rem;
}

.text-button:hover {
  color: var(--brand);
}

.group-list {
  display: grid;
  gap: 0.3rem;
  margin: 0.9rem 0;
}

.group-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.6rem 0.65rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--ink);
  text-align: left;
  background: transparent;
}

.group-item:hover {
  background: var(--paper);
}

.group-item.active {
  border-color: var(--line);
  background: var(--brand-soft);
}

.group-item > span:nth-child(2),
.member-identity > span:nth-child(2) {
  min-width: 0;
  display: grid;
  gap: 0.1rem;
}

.group-item strong,
.group-item small,
.member-identity strong,
.member-identity small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.group-item strong,
.member-identity strong {
  font-size: 0.9rem;
  font-weight: 600;
}

.group-item small,
.member-identity small {
  color: var(--muted);
  font-size: 0.76rem;
}

.group-avatar {
  width: 2rem;
  height: 2rem;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  color: var(--brand);
  background: var(--brand-soft);
  font-size: 0.85rem;
  font-weight: 600;
}

.rail-action {
  width: 100%;
}

.rail-nav {
  display: grid;
  gap: 0.15rem;
  margin-top: 1.1rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}

.rail-nav-item {
  border: 0;
  border-left: 2px solid transparent;
  border-radius: 0;
  padding: 0.5rem 0.7rem;
  text-align: left;
  color: var(--ink-soft);
  background: transparent;
  font-size: 0.88rem;
  font-weight: 600;
}

.rail-nav-item:hover {
  color: var(--ink);
  background: var(--paper);
}

.rail-nav-item.active {
  color: var(--brand);
  border-left-color: var(--accent);
  background: var(--accent-soft);
}

.workspace {
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 2.5rem);
}

.workspace-heading {
  align-items: flex-end;
}

.workspace-heading h1,
.panel-heading h2,
.modal-heading h2 {
  margin: 0;
  letter-spacing: -0.01em;
}

.workspace-heading h1 {
  font-size: clamp(1.35rem, 2.6vw, 1.75rem);
}

.panel-heading h2,
.modal-heading h2 {
  font-size: 1.05rem;
}

.subtle {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.heading-side {
  display: grid;
  gap: 0.5rem;
  justify-items: end;
}

.invite-card {
  min-width: 12rem;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 0.2rem 0.75rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.invite-card span {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.invite-card strong {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 0.85rem;
  margin: 1.75rem 0 1rem;
}

.summary-card,
.panel,
.question-card,
.empty-state {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow);
}

.summary-card {
  padding: 1.1rem;
}

.summary-card > span {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.summary-card strong {
  display: block;
  margin-top: 0.4rem;
  color: var(--brand);
  font-size: 1.6rem;
  font-weight: 600;
}

.summary-card p {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.accent-card {
  border-top: 2px solid var(--brand);
  background: var(--white);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.65fr);
  gap: 0.85rem;
}

.panel {
  min-width: 0;
  padding: 1.15rem;
}

.bank-list,
.member-list {
  display: grid;
  gap: 0.6rem;
  margin-top: 1rem;
}

.bank-card,
.member-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.bank-card h3,
.bank-card p {
  margin: 0;
}

.bank-card h3 {
  font-size: 0.95rem;
}

.bank-card p {
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.bank-actions {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.member-identity {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.status {
  flex: 0 0 auto;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--muted);
  background: var(--paper);
  font-size: 0.72rem;
  font-weight: 600;
}

.status.checked {
  color: var(--success);
  border-color: var(--success-line);
  background: var(--success-soft);
}

.inline-empty,
.empty-state {
  text-align: center;
  color: var(--muted);
}

.inline-empty {
  padding: 2rem 1rem;
  font-size: 0.88rem;
}

.inline-empty p {
  margin: 0.5rem 0 0;
}

.empty-state {
  max-width: 32rem;
  margin: 7vh auto;
  padding: 2.5rem 2rem;
}

.empty-state .empty-icon {
  margin: 0 auto 0.9rem;
}

.empty-state h2 {
  margin: 0;
  color: var(--ink);
  font-size: 1.15rem;
}

.button-row {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

.button-row .primary-button {
  min-width: 8rem;
  margin: 0;
  padding: 0 1rem;
}

.modal {
  width: min(calc(100% - 2rem), 28rem);
  padding: 0;
  border: 0;
  border-radius: var(--radius-lg);
  color: var(--ink);
  background: var(--white);
  box-shadow: 0 12px 40px rgb(15 23 42 / 22%);
}

.modal::backdrop {
  background: rgb(15 23 42 / 48%);
}

.modal form,
.modal .admin-panel {
  padding: 1.25rem;
  display: grid;
  gap: 0.95rem;
}

.modal label {
  display: grid;
  gap: 0.4rem;
  color: var(--ink-soft);
  font-size: 0.85rem;
  font-weight: 600;
}

.modal input {
  min-height: 2.7rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.form-help {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.7;
}

.template-link {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
}

.practice-view {
  min-height: 100vh;
  background: var(--paper);
}

.practice-topbar > div {
  flex-direction: column;
  align-items: flex-end;
  gap: 0.1rem;
}

.practice-topbar strong {
  font-size: 0.95rem;
}

.practice-topbar span {
  color: var(--muted);
  font-size: 0.8rem;
}

.practice-shell {
  width: min(100% - 2rem, 50rem);
  margin: 0 auto;
  padding: 1.75rem 0 4rem;
}

.progress-track {
  height: 4px;
  margin-bottom: 1rem;
  overflow: hidden;
  border-radius: 999px;
  background: var(--line);
}

.progress-track span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 200ms ease;
}

.question-card {
  padding: clamp(1.25rem, 3vw, 2.25rem);
}

.question-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 0.8rem;
}

.type-chip {
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  background: var(--paper);
  font-size: 0.75rem;
  font-weight: 600;
}

.question-card h1 {
  margin: 1.35rem 0;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 600;
  line-height: 1.65;
}

.option-list {
  display: grid;
  gap: 0.6rem;
}

.option-button {
  min-height: 3.25rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink);
  text-align: left;
  background: var(--white);
  font-size: 0.95rem;
  transition: border-color 120ms ease, background 120ms ease;
}

.option-button:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.option-button.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.option-button.correct {
  border-color: var(--success-line);
  background: var(--success-soft);
}

.option-button.wrong {
  border-color: var(--danger-line);
  background: var(--danger-soft);
}

.option-label {
  width: 1.9rem;
  height: 1.9rem;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  background: var(--paper);
  font-size: 0.85rem;
  font-weight: 600;
}

.answer-feedback {
  margin-top: 1.1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  font-size: 0.9rem;
}

.answer-feedback.success {
  color: var(--success);
  border-color: var(--success-line);
  background: var(--success-soft);
}

.answer-feedback.failure {
  color: var(--danger);
  border-color: var(--danger-line);
  background: var(--danger-soft);
}

.answer-feedback .answer-key {
  font-weight: 600;
}

.answer-feedback p {
  margin: 0.4rem 0 0;
  line-height: 1.7;
}

.answer-feedback > strong {
  font-size: 0.95rem;
}

.question-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 1.15rem;
}

.question-actions .primary-button {
  min-width: 8.5rem;
  margin: 0;
  padding: 0 1.25rem;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

.toast.error {
  background: var(--danger);
}

.role-badge {
  padding: 0.15rem 0.45rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  background: var(--paper);
  font-size: 0.72rem;
  font-weight: 600;
}

.segmented {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.segment {
  border: 0;
  border-right: 1px solid var(--line);
  padding: 0.35rem 0.9rem;
  color: var(--ink-soft);
  background: transparent;
  font-size: 0.85rem;
  font-weight: 600;
}

.segment:last-child {
  border-right: 0;
}

.segment.active {
  color: var(--white);
  background: var(--brand);
}

.leaderboard-panel {
  margin-top: 0.85rem;
}

.leaderboard-note {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.leaderboard-list,
.admin-user-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 1rem;
}

.leaderboard-row,
.admin-user-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.leaderboard-row .rank {
  width: 1.6rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
}

.leaderboard-row .member-identity,
.admin-user-row .member-identity {
  flex: 1;
  min-width: 0;
}

.leaderboard-row .accuracy {
  color: var(--brand);
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
}

.role-select {
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--ink);
  background: var(--white);
  font-size: 0.85rem;
  font-weight: 600;
}

.admin-row-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.danger-button {
  color: var(--danger);
}

.danger-button:hover {
  color: #7f1d1d;
}

.stack-form {
  display: grid;
  gap: 0.9rem;
  margin-top: 1rem;
}

.stack-form label {
  display: grid;
  gap: 0.4rem;
  color: var(--ink-soft);
  font-size: 0.85rem;
  font-weight: 600;
}

.stack-form input {
  width: 100%;
  min-height: 2.7rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--white);
  outline: none;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

.stack-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 12%);
}

.stack-form .primary-button {
  justify-self: start;
  min-width: 8.5rem;
  margin-top: 0;
  padding: 0 1.4rem;
}

.account-summary {
  display: grid;
  gap: 0.4rem;
  margin-top: 1rem;
}

.account-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  font-size: 0.9rem;
}

.account-row span {
  color: var(--muted);
}

@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .group-rail {
    padding: 0.9rem 1rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rail-title {
    display: none;
  }

  .group-list {
    grid-auto-flow: column;
    grid-auto-columns: minmax(11rem, 65vw);
    overflow-x: auto;
    margin: 0 0 0.6rem;
  }

  .rail-nav {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    overflow-x: auto;
    margin-top: 0.6rem;
    padding-top: 0.6rem;
  }

  .content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .topbar,
  .practice-topbar {
    padding: 0 1rem;
  }

  .workspace {
    padding: 1.25rem 1rem 3rem;
  }

  .workspace-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .heading-side {
    justify-items: stretch;
  }

  .invite-card {
    width: 100%;
  }

  .bank-card {
    align-items: stretch;
    flex-direction: column;
  }

  .bank-actions {
    justify-content: flex-start;
  }

  .member-row {
    align-items: flex-start;
  }

  .status {
    max-width: 7.5rem;
    white-space: normal;
    text-align: right;
  }

  .admin-user-row {
    align-items: stretch;
    flex-direction: column;
  }

  .admin-row-actions {
    justify-content: flex-end;
  }
}
/* 错题本 */
.practice-topbar-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.wrong-banks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.wrong-bank-chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  font-size: 0.85rem;
}

.wrong-bank-chip strong {
  font-weight: 600;
}

.wrong-bank-chip span {
  color: var(--muted);
  font-size: 0.78rem;
}

.wrong-list {
  display: grid;
  gap: 0.6rem;
  margin-top: 1rem;
}

.wrong-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.wrong-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.5rem;
}

.wrong-source,
.wrong-count {
  color: var(--muted);
  font-size: 0.75rem;
}

.wrong-count {
  color: var(--danger);
}

.wrong-stem {
  margin: 0 0 0.5rem;
  font-size: 0.92rem;
  line-height: 1.65;
}

.wrong-options {
  display: grid;
  gap: 0.2rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.wrongbook-note {
  color: var(--brand) !important;
  font-size: 0.82rem;
}

.heading-side .primary-button {
  min-height: 2.4rem;
  margin: 0;
  padding: 0 1rem;
  font-size: 0.88rem;
}

/* 标题行内改名按钮 */
.heading-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.heading-title .icon-button {
  width: auto;
  height: auto;
  padding: 0.25rem 0.55rem;
  font-size: 0.75rem;
  font-weight: 600;
}

/* 打卡日历 */
.streak-panel {
  margin-top: 0.85rem;
}

.streak-badge {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--brand);
  background: var(--brand-soft);
  font-size: 0.8rem;
  font-weight: 600;
}

.checkin-calendar {
  display: grid;
  grid-template-columns: repeat(14, 1fr);
  gap: 4px;
  margin-top: 1rem;
}

.calendar-cell {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--paper);
}

.calendar-cell.active {
  border-color: var(--success-line);
  background: #cdeadd;
}

.calendar-cell.medium {
  background: #8fd3b6;
}

.calendar-cell.heavy {
  border-color: var(--success);
  background: var(--success);
}

.calendar-cell.today {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* 学习统计 */
.stats-types {
  display: grid;
  gap: 0.9rem;
  margin-top: 1rem;
}

.stats-type-row {
  display: grid;
  gap: 0.4rem;
}

.stats-type-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.88rem;
}

.stats-type-head span {
  color: var(--muted);
  font-size: 0.8rem;
}

.stats-weak-tag {
  margin-left: 0.5rem;
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
  color: var(--danger);
  background: var(--danger-soft);
  font-size: 0.7rem;
  font-weight: 600;
}

.stats-track {
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--line);
}

.stats-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 240ms ease;
}

.stats-fill.weak {
  background: var(--danger);
}

.stats-daily {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(1.1rem, 1fr);
  gap: 4px;
  align-items: end;
  height: 9rem;
  margin-top: 1rem;
  overflow-x: auto;
}

.stats-bar {
  display: grid;
  grid-template-rows: 1fr auto;
  align-items: end;
  gap: 0.3rem;
  height: 100%;
}

.stats-bar-fill {
  display: block;
  width: 100%;
  border-radius: 3px 3px 0 0;
  background: var(--accent);
  opacity: 0.85;
}

.stats-bar small {
  color: var(--muted);
  font-size: 0.62rem;
  text-align: center;
  white-space: nowrap;
}

.stats-hardest {
  display: grid;
  gap: 0.5rem;
  margin-top: 1rem;
}

.stats-hard-row {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.stats-hard-stem {
  flex: 1;
  min-width: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 0.88rem;
  line-height: 1.5;
}

.partial-note {
  color: var(--danger) !important;
  font-size: 0.82rem;
}

@media (max-width: 620px) {
  .checkin-calendar {
    grid-template-columns: repeat(10, 1fr);
  }
}

/* 打卡热力图（按周对齐：7 行 × N 列） */
.calendar-wrap {
  display: flex;
  gap: 0.6rem;
  margin-top: 1rem;
}

.calendar-weekdays {
  display: grid;
  grid-template-rows: repeat(7, 0.9rem);
  gap: 3px;
  padding-top: 1.15rem;
}

.calendar-weekdays span {
  display: grid;
  place-items: center;
  width: 0.9rem;
  height: 0.9rem;
  color: var(--muted);
  font-size: 0.62rem;
}

.calendar-scroll {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
}

.calendar-months {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 0.9rem;
  gap: 3px;
  height: 1.1rem;
}

.calendar-month {
  color: var(--muted);
  font-size: 0.62rem;
  white-space: nowrap;
}

.checkin-calendar {
  display: grid;
  grid-auto-flow: column;
  grid-template-rows: repeat(7, 0.9rem);
  grid-auto-columns: 0.9rem;
  gap: 3px;
  margin: 0;
}

.calendar-cell {
  width: 0.9rem;
  height: 0.9rem;
  aspect-ratio: auto;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: #eef2f6;
}

.calendar-cell[data-level="1"] {
  border-color: #b7dfcd;
  background: #cdeadd;
}

.calendar-cell[data-level="2"] {
  border-color: #7cc7a8;
  background: #8fd3b6;
}

.calendar-cell[data-level="3"] {
  border-color: var(--success);
  background: var(--success);
}

.calendar-cell.today {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.calendar-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.9rem;
}

.calendar-legend,
.daily-legend {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--muted);
  font-size: 0.72rem;
}

.calendar-legend i,
.daily-legend i {
  display: inline-block;
  width: 0.75rem;
  height: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: #eef2f6;
}

.calendar-legend i[data-level="1"] { background: #cdeadd; }
.calendar-legend i[data-level="2"] { background: #8fd3b6; }
.calendar-legend i[data-level="3"] { background: var(--success); }

.daily-legend i.correct {
  border-color: var(--success);
  background: var(--success);
}

.daily-legend i.wrong {
  margin-left: 0.45rem;
  border-color: var(--danger);
  background: var(--danger);
  opacity: 0.7;
}

/* 每日答题：答对 / 答错堆叠柱 */
.stats-bar-stack {
  display: flex;
  flex-direction: column;
  align-self: end;
  width: 100%;
  min-height: 6px;
  overflow: hidden;
  border-radius: 3px 3px 0 0;
  background: var(--line);
}

.stats-bar-correct {
  display: block;
  flex-basis: 0;
  background: var(--success);
}

.stats-bar-wrong {
  display: block;
  flex-basis: 0;
  background: var(--danger);
  opacity: 0.7;
}

.modal select {
  width: 100%;
  min-height: 2.7rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--white);
  font-size: 0.9rem;
}

/* ---------- 全年打卡热力图（GitHub 贡献图风格） ---------- */
.calendar-wrap {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.calendar-weekdays {
  display: grid;
  grid-template-rows: repeat(7, 11px);
  gap: 3px;
  flex: 0 0 auto;
  padding-top: 1.3rem;
}

.calendar-weekdays span {
  display: grid;
  place-items: center;
  width: 1.7rem;
  height: 11px;
  color: var(--muted);
  font-size: 0.68rem;
}

.calendar-scroll {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  padding-bottom: 4px;
}

.calendar-months {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 11px;
  gap: 3px;
  height: 1.3rem;
  margin-bottom: 1px;
}

.calendar-month {
  overflow: visible;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.3rem;
  white-space: nowrap;
}

.checkin-calendar {
  display: grid;
  grid-auto-flow: column;
  grid-template-rows: repeat(7, 11px);
  grid-auto-columns: 11px;
  gap: 3px;
  margin: 0;
}

.calendar-cell {
  width: 11px;
  height: 11px;
  aspect-ratio: auto;
  border: 1px solid transparent;
  border-radius: 2px;
  background: #ebedf0;
}

.calendar-cell[data-level="0"] { background: #ebedf0; }
.calendar-cell[data-level="1"] { background: #9be9a8; }
.calendar-cell[data-level="2"] { background: #40c463; }
.calendar-cell[data-level="3"] { background: #2f9e4f; }
.calendar-cell[data-level="4"] { background: #1c6b34; }

.calendar-cell:hover {
  outline: 1px solid var(--ink-soft);
  outline-offset: 1px;
}

.calendar-cell.today {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.calendar-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
}

.calendar-legend {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  color: var(--muted);
  font-size: 0.72rem;
}

.calendar-legend i {
  display: inline-block;
  width: 11px;
  height: 11px;
  border: 1px solid transparent;
  border-radius: 2px;
  background: #ebedf0;
}

.calendar-legend i[data-level="0"] { background: #ebedf0; }
.calendar-legend i[data-level="1"] { background: #9be9a8; }
.calendar-legend i[data-level="2"] { background: #40c463; }
.calendar-legend i[data-level="3"] { background: #2f9e4f; }
.calendar-legend i[data-level="4"] { background: #1c6b34; }

.streak-badge {
  white-space: nowrap;
}

@media (max-width: 620px) {
  .calendar-weekdays span {
    width: 1.4rem;
  }
}

/* ---------- 修复：月份标签与日期格合并为同一个 grid ---------- */
.calendar-weekdays {
  display: grid;
  grid-template-rows: 1.3rem repeat(7, 11px);
  gap: 3px;
  flex: 0 0 auto;
  padding-top: 0;
}

.calendar-weekdays span {
  display: grid;
  place-items: center start;
  width: 1.7rem;
  height: auto;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1;
}

.checkin-calendar {
  display: grid;
  grid-auto-flow: column;
  grid-template-rows: 1.3rem repeat(7, 11px);
  grid-auto-columns: 11px;
  gap: 3px;
  margin: 0;
}

.calendar-month {
  overflow: visible;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.3rem;
  white-space: nowrap;
  pointer-events: none;
}

.calendar-cell.empty {
  border-color: transparent;
  background: transparent;
}

/* ---------- 打卡热力图：改用绝对定位，列宽完全受控 ---------- */
.calendar-wrap {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.calendar-weekdays {
  display: grid;
  grid-template-rows: 21px repeat(7, 11px);
  gap: 3px;
  flex: 0 0 auto;
  padding-top: 0;
}

.calendar-weekdays span {
  display: grid;
  place-items: center start;
  width: 1.7rem;
  height: auto;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1;
}

.calendar-scroll {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  padding-bottom: 4px;
}

.checkin-calendar {
  position: relative;
  display: block;
  margin: 0;
  min-width: 0;
}

.calendar-month {
  position: absolute;
  top: 0;
  width: max-content;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 21px;
  white-space: nowrap;
  pointer-events: none;
}

.calendar-cell {
  position: absolute;
  width: 11px;
  height: 11px;
  aspect-ratio: auto;
  border: 1px solid transparent;
  border-radius: 2px;
  background: #ebedf0;
}

.calendar-cell.empty {
  border-color: transparent;
  background: transparent;
}

/* ---------- 打卡热力图：尺寸按容器动态计算（电脑铺满 / 手机自适应） ---------- */
.calendar-wrap {
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
  margin-top: 0.9rem;
}

.calendar-weekdays {
  display: grid;
  grid-template-rows: var(--cal-month-row, 21px) repeat(7, var(--cal-cell, 11px));
  gap: var(--cal-gap, 3px);
  flex: 0 0 auto;
  padding-top: 0;
}

.calendar-weekdays span {
  display: grid;
  place-items: center start;
  width: 1.5rem;
  height: auto;
  color: var(--muted);
  font-size: 0.64rem;
  line-height: 1;
}

.calendar-scroll {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  padding-bottom: 4px;
}

.checkin-calendar {
  position: relative;
  display: block;
  margin: 0;
}

.calendar-month {
  position: absolute;
  top: 0;
  width: max-content;
  color: var(--muted);
  font-size: 0.64rem;
  line-height: var(--cal-month-row, 21px);
  white-space: nowrap;
  pointer-events: none;
}

.calendar-cell {
  position: absolute;
  width: var(--cal-cell, 11px);
  height: var(--cal-cell, 11px);
  aspect-ratio: auto;
  border: 1px solid transparent;
  border-radius: 2px;
  background: #ebedf0;
}

/* ---------- 成员操作与排行榜定位 ---------- */
.panel-tools {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.member-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.4rem;
}

.leaderboard-row.me {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.leaderboard-row.me .rank,
.leaderboard-row.me .accuracy {
  color: var(--accent-dark);
}

.leaderboard-row.flash {
  animation: leaderboard-flash 1.4s ease;
}

@keyframes leaderboard-flash {
  0%, 100% { box-shadow: none; }
  20%, 60% { box-shadow: 0 0 0 3px rgb(37 99 235 / 35%); }
  40%, 80% { box-shadow: 0 0 0 6px rgb(37 99 235 / 12%); }
}

@media (max-width: 620px) {
  .panel-tools {
    flex-direction: column;
    align-items: flex-end;
    gap: 0.4rem;
  }
}

/* ---------- 答题卡 ---------- */
.answer-sheet-panel {
  margin-top: 1rem;
}

.answer-sheet {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 0.75rem;
  max-height: 240px;
  overflow-y: auto;
}

.answer-sheet.collapsed {
  display: none;
}

.sheet-cell {
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--muted);
  background: var(--paper);
  font-size: 0.72rem;
  font-weight: 600;
}

.sheet-cell:hover {
  border-color: var(--accent);
}

.sheet-cell.correct {
  border-color: var(--success-line);
  color: var(--success);
  background: var(--success-soft);
}

.sheet-cell.wrong {
  border-color: var(--danger-line);
  color: var(--danger);
  background: var(--danger-soft);
}

.sheet-cell.current {
  border-color: var(--accent);
  color: var(--white);
  background: var(--accent);
  box-shadow: 0 0 0 2px rgb(37 99 235 / 20%);
}

/* ---------- 小组公告 ---------- */
.announcement-card {
  max-width: 22rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent-soft);
}

.announcement-label {
  display: block;
  color: var(--accent-dark);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.announcement-card p {
  margin: 0.3rem 0 0;
  font-size: 0.85rem;
  line-height: 1.7;
  word-break: break-word;
  white-space: pre-wrap;
}

.announcement-card .text-button {
  margin-top: 0.3rem;
  padding-left: 0;
}

/* ---------- 题目搜索 ---------- */
.search-results {
  max-height: 46vh;
  overflow-y: auto;
  padding: 0 1.25rem 1.25rem;
}

.search-row {
  padding: 0.75rem 0;
  border-top: 1px solid var(--line);
}

.search-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-stem {
  margin: 0.4rem 0 0.5rem;
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ---------- 练习节奏 ---------- */
.stats-pace {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr));
  gap: 0.6rem;
  margin-top: 1rem;
}

.pace-card {
  display: grid;
  gap: 0.2rem;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.pace-card span {
  color: var(--muted);
  font-size: 0.72rem;
}

.pace-card strong {
  font-size: 1rem;
  font-weight: 600;
}

.stats-hours {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 3px;
  align-items: end;
  height: 6rem;
  margin-top: 1.1rem;
}

.hour-bar {
  display: grid;
  grid-template-rows: 1fr auto;
  align-items: end;
  gap: 0.2rem;
  height: 100%;
}

.hour-fill {
  display: block;
  width: 100%;
  border-radius: 2px 2px 0 0;
  background: var(--accent);
  opacity: 0.8;
}

.hour-bar small {
  color: var(--muted);
  font-size: 0.6rem;
  text-align: center;
}

/* ---------- 操作日志 ---------- */
.log-list {
  display: grid;
  gap: 0.4rem;
  margin-top: 1rem;
}

.log-row {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.log-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.log-time {
  color: var(--muted);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}

.log-actor {
  font-size: 0.85rem;
  font-weight: 600;
}

.log-action {
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-sm);
  color: var(--brand);
  background: var(--brand-soft);
  font-size: 0.72rem;
  font-weight: 600;
}

.log-detail {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.6;
}

/* ---------- 管理员：所有队伍 ---------- */
.admin-group-list {
  display: grid;
  gap: 0.4rem;
  margin-top: 1rem;
}

.admin-group-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}