/* Local Data V2 — independent settings sheet, no changes to existing UI. */
.header-data-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.data-open-btn {
  height: 42px; min-width: 52px; padding: 0 12px;
  background: #fff; border: 1px solid #e5e5e5; border-radius: 22px;
  color: #484848; font-size: 13px; font-weight: 600;
  transition: background 160ms ease, transform 160ms ease;
}
.data-open-btn:hover { background: #f1f2f3; }
.data-open-btn:active { transform: scale(.97); }
.data-file-input { display: none; }
#dataDialog {
  box-sizing: border-box; width: min(460px, calc(100% - 32px));
  max-height: min(82dvh, 760px); overflow: auto;
  padding: 0; border: 1px solid rgba(255,255,255,.85);
  border-radius: 28px; background: #fff;
  box-shadow: 0 24px 70px rgba(20,22,27,.20);
  overscroll-behavior: contain;
}
#dataDialog::backdrop {
  background: rgba(22,24,28,.32);
  backdrop-filter: blur(5px); -webkit-backdrop-filter: blur(5px);
}
.data-panel { padding: 25px 24px 24px; }
.data-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; }
.data-overline { color: #85858c; font-size: 12px; margin: 0 0 6px; }
.data-head h2 { font-size: 24px; line-height: 1.24; letter-spacing: -.55px; margin: 0; }
.data-close { width: 38px; height: 38px; flex: 0 0 38px; border-radius: 50%; background: #f2f2f2; color: #777; font-size: 24px; line-height: 1; }
.data-description { color: #71717a; font-size: 13px; line-height: 1.6; margin: 15px 0 22px; }
.data-feature { border-top: 1px solid #eeeff1; padding: 17px 0; display: flex; align-items: center; gap: 12px; justify-content: space-between; }
.data-feature-copy { display: flex; flex: 1; min-width: 0; flex-direction: column; gap: 4px; }
.data-feature-copy strong { font-size: 14px; font-weight: 650; color: #222; }
.data-feature-copy span { font-size: 12px; line-height: 1.4; color: #898990; }
.data-action { padding: 0 12px; flex: 0 0 auto; min-height: 36px; background: #f0f1f3; border-radius: 11px; font-size: 12px; font-weight: 600; color: #34343b; }
.data-action:hover { background: #e6e7eb; }
.data-preview { margin-top: 6px; background: #f7f7f8; border: 1px solid #e8e8ea; padding: 16px; border-radius: 16px; }
.data-preview h3 { font-size: 15px; font-weight: 650; margin: 0 0 8px; }
.data-preview p { color: #676771; font-size: 12px; line-height: 1.6; margin: 8px 0 14px; }
.data-label { display: block; font-size: 12px; font-weight: 600; margin: 12px 0 7px; color: #444; }
.data-select { box-sizing: border-box; width: 100%; min-height: 42px; padding: 8px 12px; border-radius: 10px; border: 1px solid #e0e0e4; background: #fff; font-size: 13px; color: #262629; }
.data-preview .data-warning { color: #9b4e27; }
.data-confirm { margin-bottom: 0; line-height: 1.55; font-size: 12px; color: #5c3a2a; display: flex; align-items: start; gap: 8px; margin: 8px 0 14px; }
.data-confirm input[type="checkbox"] { box-sizing: border-box; appearance: auto; -webkit-appearance: checkbox; width: 16px; height: 16px; min-width: 16px; max-width: 16px; padding: 0; margin: 1px 0 0; flex: 0 0 16px; border-radius: 3px; }
.data-primary { width: 100%; margin-top: 14px; background: #171719; color: #fff; min-height: 43px; border-radius: 12px; font-weight: 600; font-size: 13px; }
.data-primary:disabled { opacity: .42; cursor: not-allowed; }
.data-status { min-height: 17px; margin: 14px 0 0; font-size: 12px; color: #73737b; line-height: 1.5; }
.data-status.error { color: #a23d3d; }
[hidden] { display: none !important; }
@media (max-width: 600px) {
  #dataDialog[open] {
    position: fixed; inset: auto 16px calc(16px + env(safe-area-inset-bottom, 0px)) 16px;
    width: calc(100% - 32px); max-width: 460px;
    max-height: min(82dvh, calc(100dvh - 42px - env(safe-area-inset-bottom, 0px)));
    margin: 0 auto;
    animation: data-sheet-in 260ms cubic-bezier(.22,1,.36,1) both;
  }
  .data-panel { padding: 24px 20px 21px; min-width: 0; }
  /* 编辑学期时仅展示表单，避免与备份/导入叠在一起形成超长面板。 */
  #dataDialog.semester-editing .data-description,
  #dataDialog.semester-editing .data-feature,
  #dataDialog.semester-editing #importPreview { display: none !important; }
  #dataDialog.semester-editing .data-semester-form { margin-top: 20px; }
  #dataDialog.semester-editing .data-panel { padding-bottom: 20px; }
  #dataDialog[open] { -webkit-overflow-scrolling: touch; overflow-x: hidden; overflow-y: auto; }
  #dataDialog .data-semester-form { min-width: 0; }
  #dataDialog .data-semester-form .data-select {
    display: block; box-sizing: border-box; min-width: 0; max-width: 100%; width: 100%;
    font-size: 16px; line-height: normal;
  }
  #dataDialog .data-semester-form input[type="date"] {
    height: 46px; min-height: 46px; padding: 0 12px;
  }
  #dataDialog .data-semester-form input[type="number"] { height: 46px; min-height: 46px; }
  #dataDialog .data-semester-form input[type="text"] { height: 46px; min-height: 46px; }
}
@keyframes data-sheet-in { from { opacity: .7; transform: translateY(16px) scale(.985); } to { opacity: 1; transform: translateY(0) scale(1); } }
@media (prefers-reduced-motion: reduce) { #dataDialog[open] { animation: none; } .data-open-btn { transition: none; } }

/* School Import V1: show only after explicitly enabling local preview. */
#schoolImportNotice { padding: 9px 0 0; }

/* School Import V2: restrained three-way comparison preview. */
.school-sync-changes { display: grid; gap: 6px; margin: 10px 0 14px; max-height: 180px; overflow: auto; overscroll-behavior: contain; }
.school-sync-item { background: #fff; border: 1px solid #e9e9ed; border-radius: 10px; padding: 9px 11px; }
.school-sync-item strong { display: block; font-size: 12px; line-height: 1.5; color: #303038; }
.school-sync-item span { display: block; font-size: 11px; line-height: 1.5; color: #76767c; overflow-wrap: anywhere; }
.school-sync-item.conflict { border-color: #f0d1bd; background: #fffaf7; }
.school-sync-count { margin: 7px 0 !important; font-weight: 600; }

/* Semester settings V1: explicit first-week date; no background data rewrite. */
.data-semester-form { margin: 0 0 8px; padding: 14px 16px 16px; background: #f7f7f8; border: 1px solid #ececee; border-radius: 16px; }
.data-semester-form .data-label:first-child { margin-top: 0; }
.data-semester-form .data-select { font-family: inherit; }
.data-semester-hint { font-size: 12px; line-height: 1.6; margin: 8px 0 10px; color: #777780; }
.data-semester-actions { display: flex; align-items: center; gap: 10px; margin-top: 14px; }
.data-semester-actions .data-primary { flex: 1; width: auto; margin-top: 0; }
.data-semester-actions .data-action { min-height: 43px; }