/* Toast and loading */

.toast-stack {
  position: fixed;
  z-index: 100;
  right: 22px;
  bottom: 22px;
  display: grid;
  gap: 8px;
  width: min(360px, calc(100vw - 44px));
}

.toast {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 11px;
  color: var(--text);
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: toast-in 0.18s ease-out;
  font-size: 12px;
}

.toast.success .icon {
  color: var(--mint);
}

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

/* 可点击跳转的 toast（如「去 AI 出题设置配置」） */
.toast.tappable {
  cursor: pointer;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.loading-screen {
  display: grid;
  min-height: 100vh;
  place-items: center;
  color: var(--muted);
}

.spinner {
  display: inline-block;
  width: 17px;
  height: 17px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
}

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

.inline-spinner {
  width: 13px;
  height: 13px;
  border-width: 2px;
}

@media (max-width: 1080px) {
  .auth-layout {
    grid-template-columns: minmax(300px, 0.8fr) minmax(420px, 1.2fr);
  }

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

@media (max-width: 900px) {
  :root {
    --sidebar-width: 248px;
  }

  .sidebar {
    box-shadow: 14px 0 40px rgba(27, 35, 74, 0.13);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-shell {
    width: 100%;
    margin-left: 0;
  }

  .mobile-menu-button {
    display: inline-grid;
  }

  .topbar {
    padding-inline: 18px;
  }

  .page {
    padding-inline: 18px;
  }

  .sidebar-scrim {
    position: fixed;
    z-index: 25;
    inset: 0;
    background: rgba(24, 30, 55, 0.25);
  }
}

@media (max-width: 680px) {
  .auth-layout {
    display: block;
  }

  .auth-visual {
    min-height: 310px;
    align-items: flex-start;
    padding: 30px 25px;
  }

  .auth-visual h1 {
    margin-top: 25px;
    font-size: 38px;
  }

  .auth-visual p {
    font-size: 14px;
  }

  .auth-feature-list {
    display: none;
  }

  .auth-panel {
    padding: 42px 25px 54px;
  }

  .topbar-title h1 {
    display: none;
  }

  .topbar-actions .button-secondary {
    display: none;
  }

  .page {
    padding-top: 30px;
  }

  .page-header {
    display: block;
  }

  .page-header-actions {
    margin-top: 18px;
  }

  .page-header-actions .button-primary {
    width: 100%;
  }

  .stats-grid,
  .occurrence-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    gap: 9px;
    margin-bottom: 30px;
  }

  .stat-card {
    min-height: 82px;
    padding: 14px;
  }

  .section-block {
    margin-top: 30px;
  }

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

  .toolbar-left,
  .toolbar-right,
  .search-wrap {
    width: 100%;
  }

  .toolbar-right {
    justify-content: space-between;
  }

  .search-wrap {
    max-width: none;
  }

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

  .lesson-progress {
    width: 62px;
  }

  .lesson-title-line {
    display: block;
  }

  .lesson-time {
    margin-top: 2px;
  }

  .calendar-card {
    padding: 12px;
  }

  .calendar-day {
    min-height: 57px;
    padding-top: 7px;
  }

  .calendar-day-count {
    font-size: 9px;
  }

  .focus-heading {
    display: block;
  }

  .focus-progress-copy {
    margin-top: 13px;
    text-align: left;
  }

  .focus-task-toolbar {
    align-items: flex-start;
  }

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

  .modal-backdrop {
    align-items: end;
    padding: 0;
  }

  .modal {
    width: 100%;
    max-height: 92vh;
    border-radius: 20px 20px 0 0;
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding-inline: 18px;
  }

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

  .field-full {
    grid-column: auto;
  }

  .document-actions .button-small span {
    display: none;
  }

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

  .review-row-status {
    display: none;
  }

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