/* Stage 4 is scoped to account entry, operations pages and help. */
#loginView .teacher-auth-shell { max-width: 1080px; margin: 0 auto; padding: 36px 24px 52px; }
#loginView .teacher-auth-intro { margin-bottom: 28px; }
#loginView .teacher-auth-intro h1 { font-size: 32px; color: var(--ink); margin: 8px 0 12px; line-height: 1.4; }
#loginView .teacher-auth-intro > p:last-child { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.8; }
#loginView .teacher-auth-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); align-items: start; gap: 30px; }
#loginView .teacher-auth-card { min-width: 0; padding: 30px; border: 1px solid var(--line); border-radius: 22px; background: var(--panel); box-shadow: var(--shadow); }
#loginView .teacher-auth-card h2 { margin: 0 0 18px; color: var(--ink); font-size: 23px; }
#loginView .auth-tabs { margin: 0 0 24px; }
#loginView .auth-tab { min-height: 44px; font-size: 14px; }
#loginView .field > span:first-child { font-size: 14px; color: var(--text-secondary); }
#loginView .field input { min-width: 0; min-height: 48px; font-size: 15px; }
#loginView .teacher-password-field { display: flex; align-items: center; position: relative; width: 100%; }
#loginView .teacher-password-field input { padding-right: 66px; }
#loginView .teacher-password-field button { position: absolute; right: 6px; top: 5px; bottom: 5px; min-width: 50px; border: 0; border-radius: 8px; background: var(--primary-soft); color: var(--primary-strong); padding: 6px 8px; font-size: 12px; font-weight: 750; }
#loginView .teacher-remember { display: flex; align-items: flex-start; gap: 9px; font-size: 13px; color: var(--muted); line-height: 1.7; margin: 0 0 16px; }
#loginView .teacher-remember input { flex: 0 0 17px; width: 17px; height: 17px; min-height: 0; margin: 2px 0 0; accent-color: var(--primary); }
#loginView :is(#loginForm, #registerForm) > .primary { margin-top: 5px; justify-content: center; font-size: 15px; }
#loginView .teacher-text-link { display: block; margin: 12px auto 0; padding: 10px; background: none; border: 0; color: var(--primary-strong); font-size: 13px; font-weight: 750; }
#loginView .form-error { margin: 0 0 14px; font-size: 13px; line-height: 1.7; }
#loginView .form-error:empty { display: none; }
#loginView .teacher-auth-note { margin: 0 0 20px; color: var(--muted); font-size: 13px; line-height: 1.8; }
#loginView .teacher-entry-guides { display: grid; gap: 20px; }
#loginView .teacher-entry-card { padding: 26px; border-radius: 20px; background: var(--primary-soft); border: 1px solid var(--primary-border); }
#loginView .teacher-entry-card h2 { font-size: 21px; color: var(--ink); margin: 6px 0 20px; }
#loginView .teacher-entry-steps { list-style: none; display: grid; gap: 19px; padding: 0; margin: 0 0 24px; }
#loginView .teacher-entry-steps > li { display: flex; gap: 13px; align-items: flex-start; }
#loginView .teacher-entry-steps > li > span { display: grid; place-items: center; width: 28px; height: 28px; flex-shrink: 0; color: var(--on-primary); background: var(--primary); border-radius: 50%; font-size: 12px; font-weight: 800; }
#loginView .teacher-entry-steps strong { font-size: 14px; color: var(--ink); line-height: 1.8; }
#loginView .teacher-entry-steps p { margin: 4px 0 0; font-size: 13px; color: var(--text-secondary); line-height: 1.8; }
#loginView .teacher-student-entry { padding: 22px 26px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
#loginView .teacher-student-entry h2 { margin: 0 0 10px; font-size: 18px; color: var(--ink); }
#loginView .teacher-student-entry p { font-size: 13px; color: var(--muted); line-height: 1.8; margin: 0 0 18px; }
#loginView .teacher-student-entry .btn { display: inline-flex; text-decoration: none; }
#topNotify:disabled { opacity: .45; cursor: not-allowed; }
.teacher-operations-page { min-width: 0; }
.teacher-operations-page .teacher-page-head { justify-content: space-between; }
.teacher-operations-page .btn.primary, .teacher-help-dialog .btn.primary { width: auto; min-height: 42px; margin: 0; justify-content: center; }
.teacher-operations-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.teacher-operation-card { min-width: 0; padding: 25px; border: 1px solid var(--line); background: var(--panel); border-radius: 17px; }
.teacher-operation-card > h2, .teacher-section-heading h2 { color: var(--ink); font-size: 20px; line-height: 1.6; margin: 0 0 14px; overflow-wrap: anywhere; }
.teacher-operation-card > p:not(.teacher-kicker), .teacher-section-heading p { color: var(--muted); font-size: 14px; line-height: 1.85; margin: 0 0 20px; }
.teacher-profile { display: grid; gap: 0; margin: 0 0 18px; }
.teacher-profile > div { display: grid; grid-template-columns: 85px minmax(0, 1fr); gap: 15px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.teacher-profile dt { color: var(--muted); font-size: 13px; }
.teacher-profile dd { margin: 0; color: var(--ink); font-size: 14px; font-weight: 650; overflow-wrap: anywhere; }
.teacher-small-note, .teacher-operation-card > p.teacher-small-note { font-size: 12px; color: var(--muted); line-height: 1.8; }
.teacher-availability-card { display: flex; align-items: flex-start; gap: 17px; padding: 23px 25px; margin-top: 22px; background: var(--surface); border: 1px solid var(--line); border-radius: 17px; }
.teacher-availability-card > .pill { flex-shrink: 0; margin-top: 3px; }
.teacher-availability-card h2 { margin: 0 0 8px; font-size: 17px; color: var(--ink); }
.teacher-availability-card p { color: var(--muted); font-size: 13px; line-height: 1.85; margin: 0; }
.teacher-availability-card .btn { margin-top: 15px; }
.teacher-setting-toggle { display: flex; align-items: flex-start; gap: 12px; color: var(--ink); font-size: 14px; padding: 16px; border-radius: 12px; background: var(--primary-soft); border: 1px solid var(--primary-border); line-height: 1.7; cursor: pointer; }
.teacher-setting-toggle input { accent-color: var(--primary); width: 18px; height: 18px; flex: 0 0 18px; margin: 3px 0 0; }
.teacher-operation-card > p.teacher-setting-status { min-height: 22px; margin: 10px 0 14px; font-size: 12px; color: var(--primary-strong); }
.teacher-operation-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin: 16px 0 12px; }
.teacher-operation-stats > article { min-width: 0; padding: 21px; display: grid; gap: 10px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.teacher-operation-stats span { font-size: 13px; color: var(--text-secondary); font-weight: 750; }
.teacher-operation-stats strong { color: var(--ink); font-size: 30px; line-height: 1.3; }
.teacher-operation-stats small { color: var(--muted); font-size: 11px; line-height: 1.6; }
.teacher-stat-definition { margin: 0 0 24px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.teacher-analytics-detail { padding-bottom: 12px; }
.teacher-section-heading p { font-size: 13px; margin-bottom: 20px; }
#analyticsTableHeading { scroll-margin-top: 90px; }
.teacher-analytics-filters { display: grid; grid-template-columns: minmax(0, 1fr) 190px; gap: 12px; }
.teacher-analytics-filters .input, .teacher-analytics-filters .select { width: 100%; min-height: 44px; }
.teacher-analytics-detail table { min-width: 730px; }
.teacher-analytics-detail th { font-size: 12px; white-space: nowrap; }
.teacher-analytics-detail td { font-size: 14px; vertical-align: middle; }
.teacher-analytics-detail td:first-child { min-width: 210px; }
.teacher-analytics-detail td:first-child > strong { display: block; color: var(--ink); font-size: 14px; line-height: 1.7; }
.teacher-analytics-detail td:first-child > small { display: block; margin-top: 5px; color: var(--muted); font-size: 11px; }
.teacher-analytics-detail .btn { white-space: nowrap; }
.teacher-analytics-detail .pill.neutral { color: var(--muted); background: var(--surface-muted); }
.teacher-rate-cell > span:first-child { font-variant-numeric: tabular-nums; font-size: 13px; }
.teacher-rate-track { display: block; background: var(--surface-muted); height: 6px; width: 70px; margin-top: 7px; border-radius: 6px; overflow: hidden; }
.teacher-rate-track > span { display: block; height: 100%; background: var(--primary); border-radius: inherit; }
.teacher-analytics-detail td.teacher-analytics-empty { text-align: center; padding: 28px 16px; }
.teacher-analytics-empty p { color: var(--muted); font-size: 13px; margin: 0 0 16px; }
.teacher-stat-footnote { color: var(--muted); font-size: 12px; margin: 18px 0 0; line-height: 1.8; }
.teacher-stat-footnote p { margin: 5px 0; }
.teacher-help-dialog { width: min(850px, calc(100vw - 32px)); max-height: calc(100dvh - 32px); padding: 0; border: 1px solid var(--line); border-radius: 20px; background: var(--panel); color: var(--ink); overflow: auto; box-shadow: 0 24px 70px rgba(18,52,77,.2); }
.teacher-help-dialog::backdrop { background: rgba(18,52,77,.5); }
.teacher-help-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; position: sticky; top: 0; z-index: 2; background: var(--panel); padding: 20px 25px; border-bottom: 1px solid var(--line); }
.teacher-help-head h2 { font-size: 23px; margin: 0; }
#closeTeacherHelp { flex-shrink: 0; }
.teacher-help-body { padding: 24px 25px; }
.teacher-help-intro { color: var(--muted); font-size: 14px; line-height: 1.8; margin: 0 0 20px; }
.teacher-help-topics { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.teacher-help-topics button { border: 1px solid var(--line); border-radius: 9px; padding: 9px 12px; font-size: 12px; color: var(--primary-strong); background: var(--primary-soft); font-weight: 700; }
.teacher-help-body details { padding: 18px; border: 1px solid var(--line); border-radius: 12px; margin: 0 0 12px; scroll-margin-top: 105px; }
.teacher-help-body summary { color: var(--ink); font-size: 15px; font-weight: 750; line-height: 1.7; cursor: pointer; }
.teacher-help-body details[open] summary { margin-bottom: 17px; }
.teacher-help-body :is(p, li) { font-size: 14px; line-height: 1.85; color: var(--text-secondary); }
.teacher-help-body ol { padding-left: 22px; }
.teacher-help-body li + li { margin-top: 8px; }
.teacher-help-body .btn { font-size: 13px; display: inline-flex; text-decoration: none; }
.teacher-help-actions { display: flex; flex-wrap: wrap; gap: 9px; }
@media (max-width: 1120px) {
  .teacher-operation-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 780px) {
  #loginView .teacher-auth-layout, .teacher-operations-grid { grid-template-columns: minmax(0, 1fr); }
  #loginView .teacher-auth-shell { max-width: 620px; padding: 24px 18px 36px; }
  #loginView .teacher-auth-intro h1 { font-size: 27px; }
  #loginView .teacher-auth-card { padding: 24px; }
}
@media (max-width: 520px) {
  #loginView .teacher-auth-card, #loginView .teacher-entry-card, #loginView .teacher-student-entry { padding: 20px; }
  .teacher-operation-card { padding: 18px; }
  .teacher-operation-card > h2 { font-size: 19px; }
  .teacher-operation-stats { gap: 10px; }
  .teacher-operation-stats > article { padding: 15px; }
  .teacher-operation-stats strong { font-size: 26px; }
  .teacher-availability-card { padding: 18px; flex-direction: column; gap: 10px; }
  .teacher-analytics-filters { grid-template-columns: minmax(0, 1fr); }
  .teacher-help-head { padding: 18px; }
  .teacher-help-head h2 { font-size: 21px; }
  .teacher-help-body { padding: 18px; }
  .teacher-help-body details { padding: 14px; }
  .teacher-help-body :is(p, li) { font-size: 13px; }
}