:root {
  color-scheme: light;
  --ink: #10233f;
  --muted: #536b84;
  --line: #c9ddeb;
  --line-strong: #0e2f54;
  --panel: #ffffff;
  --bg: #ffffff;
  --brand: #176dac;
  --brand-dark: #0e2f54;
  --brand-soft: #eaf4fc;
  --line-soft: #c9ddeb;
  --brand-red: #a81f28;
  --warn: #b45309;
  --bad: #b42318;
  --good: #1d6fb2;
}

* {
  box-sizing: border-box;
}

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

button,
input,
select {
  font: inherit;
}

button,
.button-link {
  border: 1px solid var(--brand-dark);
  background: var(--brand);
  color: #fff;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 6px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

button:hover,
.button-link:hover {
  background: var(--brand-dark);
}

button.danger {
  background: var(--bad);
}

button.danger:hover {
  background: #8a1f17;
}

.hidden {
  display: none !important;
}

.login-view {
  min-height: 100vh;
  display: grid;
  align-content: center;
  gap: 24px;
  padding: 28px;
  max-width: 520px;
  margin: 0 auto;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font-weight: 800;
}

.brand-block h1,
.topbar h1,
.section-title h2 {
  margin: 0;
}

.brand-block p,
.eyebrow,
.hint {
  margin: 4px 0 0;
  color: var(--muted);
}

.login-panel,
.form-grid,
.table-wrap,
.close-list,
.audit-list {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.form-grid,
.table-wrap,
.close-list,
.audit-list,
.student-card,
.detail-panel,
.notice-card,
.alert-item {
  box-shadow: 0 1px 0 rgba(18, 61, 102, 0.05);
}

.login-panel {
  display: grid;
  gap: 14px;
  padding: 18px;
}

label {
  display: grid;
  gap: 7px;
}

label span {
  color: var(--muted);
  font-size: 13px;
}

input,
select,
textarea {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  padding: 0 10px;
  color: var(--ink);
  background: #fff;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid rgba(37, 139, 214, 0.18);
  border-color: var(--brand);
}

.searchable-student-select {
  display: grid;
  gap: 6px;
  width: 100%;
  min-width: 0;
}

.student-select-search-input {
  min-width: 0;
  background: #f7fbff;
  border-color: var(--brand);
}

.filter-row > .searchable-student-select {
  grid-template-columns: minmax(150px, 1fr) minmax(150px, 1fr);
  min-width: 330px;
}

.filter-row > .searchable-student-select select {
  min-width: 0;
}

.history-filter-row .searchable-student-select {
  grid-template-columns: 1fr;
  min-width: 0;
  width: 100%;
}

.history-filter-row .student-select-search-input,
.history-filter-row .searchable-student-select select {
  box-sizing: border-box;
  min-width: 0;
  width: 100%;
}

textarea {
  padding: 10px;
  resize: vertical;
}

.shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 18px 88px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.top-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.icon-btn {
  min-width: 52px;
  background: var(--brand-dark);
}

.mini-btn {
  min-height: 30px;
  padding: 0 9px;
  background: #2d5f91;
  font-size: 12px;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg);
  padding: 8px 0 12px;
}

.tabs button {
  background: #d9ecfb;
  color: var(--brand-dark);
  min-height: 40px;
  padding: 0 8px;
  border-color: var(--line-soft);
}

.tabs button.active {
  background: var(--brand);
  color: #fff;
}

.view {
  display: grid;
  gap: 14px;
}

.dashboard-group {
  display: grid;
  gap: 10px;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

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

.kpi {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  min-height: 104px;
}

.kpi span {
  color: var(--muted);
  font-size: 13px;
}

.kpi strong {
  display: block;
  margin-top: 10px;
  font-size: 26px;
  line-height: 1.1;
  word-break: break-word;
}

.kpi small {
  display: block;
  margin-top: 7px;
  line-height: 1.45;
  color: var(--muted);
}

.payable-breakdown {
  display: grid;
  gap: 5px;
}

.payable-breakdown > span {
  display: block;
}

.payable-breakdown b {
  display: block;
  margin-bottom: 2px;
  color: var(--ink);
  font-size: 11px;
}

.profit-good strong {
  color: var(--good);
}

.profit-bad strong {
  color: var(--bad);
}

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

.analysis-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  min-height: 260px;
}

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

.chart-head h3 {
  margin: 0;
  font-size: 16px;
}

.chart-head span {
  color: var(--muted);
  font-size: 13px;
}

.bar-chart {
  display: grid;
  gap: 10px;
}

.bar-row {
  display: grid;
  grid-template-columns: 44px 1fr minmax(110px, auto);
  gap: 8px;
  align-items: center;
}

.bar-row.stacked {
  grid-template-columns: 44px 1fr 48px;
}

.bar-row span,
.bar-row strong,
.dual-bars em {
  font-size: 12px;
}

.bar-row strong {
  text-align: right;
}

.bar-track {
  height: 12px;
  border-radius: 999px;
  background: #d8ebfb;
  overflow: hidden;
}

.bar-track i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--brand);
}

.bar-track.good i {
  background: var(--good);
}

.bar-track.bad i {
  background: var(--bad);
}

.dual-bars {
  display: grid;
  gap: 5px;
}

.dual-bars > div {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 6px;
  align-items: center;
}

.dual-bars em {
  color: var(--muted);
  font-style: normal;
}

.forecast-panel {
  display: grid;
  gap: 8px;
}

.forecast-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding: 8px 0;
}

.forecast-row:last-child {
  border-bottom: 0;
}

.forecast-row span {
  color: var(--ink);
}

.forecast-row small {
  display: block;
  color: var(--muted);
}

.low-stock-note,
.empty-chart {
  color: var(--muted);
  font-size: 13px;
  padding-top: 6px;
}

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

.alert-item,
.notice-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.notice-card {
  grid-template-columns: 1fr auto;
}

.alert-item.bad,
.notice-card.bad {
  border-color: #fda29b;
  background: #fff8f7;
}

.alert-item.warn,
.notice-card.warn {
  border-color: #fed7aa;
  background: #fffaf3;
}

.alert-item.ok,
.notice-card.ok {
  border-color: #bbf7d0;
  background: #f7fef9;
}

.alert-item p,
.alert-item small,
.notice-card p {
  margin: 3px 0 0;
  color: var(--muted);
}

.alert-item > span {
  color: var(--muted);
  font-size: 12px;
}

.section-title {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 12px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid rgba(29, 79, 130, 0.18);
}

.section-title.with-controls {
  align-items: center;
}

.section-title span {
  color: var(--muted);
  font-size: 13px;
}

.filter-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.filter-row select {
  min-width: 160px;
}

.history-archive {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.student-lesson-query {
  display: grid;
  gap: 12px;
  margin-top: 12px;
  padding: 14px;
  background: #f8fcff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.inline-query-form {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) auto;
  gap: 8px;
  min-width: min(100%, 420px);
}

.inline-query-form button {
  min-width: 92px;
}

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

.query-summary .kpi {
  min-height: 86px;
  padding: 12px;
}

.query-summary .kpi strong {
  font-size: 25px;
}

.query-columns {
  display: grid;
  gap: 12px;
}

.query-block {
  display: grid;
  gap: 8px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 0;
  overflow: hidden;
}

.query-block summary,
.inline-details summary {
  cursor: pointer;
  color: var(--brand-dark);
  font-weight: 800;
}

.query-block > summary {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  min-height: 46px;
  padding: 0 12px;
  background: var(--brand-soft);
  border-bottom: 1px solid var(--line-soft);
}

.query-block > summary span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

.query-block .table-wrap {
  border: 0;
  border-radius: 0;
}

.more-row td {
  background: #f8fcff;
}

.inline-details {
  padding: 8px 0;
}

.nested-table {
  margin-top: 8px;
  max-height: 360px;
  overflow: auto;
}

.history-title {
  align-items: flex-start;
  flex-wrap: wrap;
}

.history-title h2,
.history-title span {
  white-space: nowrap;
}

.history-title > div:first-child {
  flex: 0 0 auto;
  min-width: 220px;
}

.history-filter-row {
  display: grid;
  grid-template-columns: minmax(180px, 1.6fr) repeat(4, minmax(130px, 1fr));
  flex: 1 1 680px;
  width: min(100%, 900px);
}

.history-filter-row input,
.history-filter-row select {
  min-width: 0;
}

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

.student-filter-panel {
  display: grid;
  grid-template-columns: 1.6fr repeat(5, minmax(120px, 1fr));
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 14px;
}

.form-heading {
  grid-column: 1 / -1;
  display: grid;
  gap: 3px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line-soft);
}

.form-heading strong {
  font-size: 18px;
}

.form-heading span {
  color: var(--muted);
  font-size: 13px;
}

.wide {
  grid-column: span 2;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

.student-master-table {
  min-width: 1500px;
}

.student-card-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.student-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.student-card.selected {
  border-color: var(--brand);
  box-shadow: 0 0 0 2px rgba(37, 139, 214, 0.14);
}

.student-list-summary {
  display: grid;
  grid-template-columns: minmax(180px, 2fr) minmax(120px, 1.2fr) minmax(100px, 0.8fr) minmax(90px, 0.8fr) minmax(150px, auto) 22px;
  gap: 12px;
  align-items: center;
  min-height: 68px;
  padding: 10px 12px;
  list-style: none;
}

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

.student-name-block {
  min-width: 0;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.student-name-block strong {
  display: block;
  font-size: 18px;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.student-name-block p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
  overflow-wrap: anywhere;
}

.student-index {
  flex: 0 0 auto;
  min-width: 30px;
  height: 30px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-weight: 800;
  font-size: 12px;
}

.student-card-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.student-list-field {
  min-width: 0;
}

.student-list-field span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.student-list-field strong {
  display: block;
  margin-top: 3px;
  overflow-wrap: anywhere;
}

.student-list-field.bad strong {
  color: var(--bad);
}

.student-list-chevron {
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--brand-dark);
  border-bottom: 2px solid var(--brand-dark);
  transform: rotate(45deg);
  transition: transform 160ms ease;
}

.student-card[open] .student-list-chevron {
  transform: rotate(225deg);
}

.student-expanded-detail {
  padding: 14px 18px 16px 52px;
  border-top: 1px solid var(--line-soft);
  background: #fff;
}

.student-card-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  padding: 0 12px 12px 52px;
  border-top: 1px solid var(--line-soft);
  padding-top: 12px;
}

.student-metric {
  min-width: 0;
  background: #f7fbff;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  padding: 9px;
}

.student-metric span,
.student-metric small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.student-metric strong {
  display: block;
  margin: 4px 0;
  font-size: 18px;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.student-metric.bad {
  background: #fff7f7;
  border-color: #fecdca;
}

.student-metric.bad strong {
  color: var(--bad);
}

.student-empty {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  color: var(--muted);
}

.clickable-row {
  cursor: pointer;
}

.clickable-row:hover {
  background: #f7fbff;
}

th,
td {
  padding: 11px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  white-space: nowrap;
}

th {
  color: var(--muted);
  font-size: 13px;
  background: var(--brand-soft);
}

.badge {
  display: inline-flex;
  min-height: 26px;
  align-items: center;
  padding: 0 8px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-weight: 700;
  font-size: 12px;
}

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

.badge.bad {
  background: #fef3f2;
  color: var(--bad);
}

.finance-workflow-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  padding: 18px 0 14px;
  border-bottom: 2px solid var(--brand-dark);
}

.finance-workflow-head span {
  color: var(--muted);
  font-size: 13px;
}

.finance-workflow-head h2 {
  margin: 4px 0 0;
  font-size: 28px;
}

.finance-step-nav {
  display: grid;
  grid-template-columns: repeat(var(--workflow-steps, 4), minmax(105px, 1fr));
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.finance-step-nav a {
  min-height: 42px;
  padding: 0 12px;
  display: grid;
  place-items: center;
  color: var(--brand-dark);
  background: #f7fbff;
  border-right: 1px solid var(--line-soft);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.finance-step-nav a:last-child {
  border-right: 0;
}

.finance-step-nav a:hover {
  background: var(--brand-soft);
}

.finance-stage {
  display: grid;
  gap: 12px;
  padding: 18px 0 22px;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: 76px;
}

.finance-stage:last-child {
  border-bottom: 0;
}

.finance-stage-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.finance-stage-number {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--brand-dark);
  border-radius: 6px;
  font-weight: 800;
}

.finance-stage-head h2 {
  margin: 0;
  font-size: 21px;
}

.finance-stage-head p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.finance-panel {
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.finance-panel summary {
  min-height: 58px;
  padding: 10px 48px 10px 14px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  cursor: pointer;
  list-style: none;
  background: #f7fbff;
}

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

.finance-panel summary::after {
  content: "+";
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--brand-dark);
  font-size: 24px;
  line-height: 1;
}

.finance-panel[open] summary::after {
  content: "−";
}

.finance-panel summary span {
  font-weight: 800;
}

.finance-panel summary small {
  color: var(--muted);
  text-align: right;
}

.finance-panel-body {
  display: grid;
  gap: 12px;
  padding: 14px;
  border-top: 1px solid var(--line-soft);
}

.finance-panel .form-grid {
  padding: 0;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.renewal-month-table td {
  vertical-align: middle;
}

.renewal-month-table small {
  color: var(--muted);
}

.renewal-month-table td:last-child {
  min-width: 140px;
  overflow-wrap: anywhere;
}

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

.finance-equation {
  display: grid;
  grid-template-columns: minmax(92px, 1fr) auto auto auto auto auto auto auto;
  align-items: center;
  gap: 8px;
  min-height: 72px;
  padding: 12px 14px;
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
}

.finance-equation > span {
  font-weight: 800;
}

.finance-equation strong {
  white-space: nowrap;
}

.finance-equation em {
  color: var(--muted);
  font-style: normal;
}

.finance-equation small {
  grid-column: 1 / -1;
  color: var(--muted);
}

.finance-equation .good {
  color: var(--good);
}

.finance-equation .bad {
  color: var(--bad);
}

.company-health-grid .kpi:first-child {
  grid-column: span 2;
  background: var(--brand-soft);
  border-width: 2px;
}

.workflow-summary-grid .kpi {
  min-height: 92px;
}

.workflow-panel-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
}

.workflow-panel-status span {
  color: var(--muted);
}

.workflow-panel-status strong {
  color: var(--brand-dark);
}

.action-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  background: #f7fbff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.close-list,
.audit-list {
  display: grid;
  gap: 0;
}

.list-item {
  padding: 12px;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

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

.list-item p {
  margin: 3px 0 0;
  color: var(--muted);
}

.detail-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
}

.detail-panel p {
  margin: 4px 0 0;
  color: var(--muted);
}

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

.detail-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.detail-grid span {
  background: #f7fbff;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  padding: 9px 10px;
}

.package-history {
  margin-bottom: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
}

.package-history-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.package-history-head h3 {
  margin: 0;
  font-size: 16px;
}

.package-history-head span {
  color: var(--muted);
  font-size: 12px;
}

.package-list {
  display: grid;
  gap: 8px;
}

.package-row {
  display: grid;
  grid-template-columns: minmax(90px, 0.7fr) repeat(5, minmax(120px, 1fr));
  gap: 8px;
  align-items: stretch;
  padding: 9px;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  background: #fff;
}

.package-row-title,
.package-field {
  min-width: 0;
  padding: 7px 8px;
}

.package-row-title {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 7px;
  border-right: 1px solid var(--line-soft);
}

.package-field span,
.package-field small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.package-field strong {
  display: block;
  margin: 4px 0;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.package-field.bad strong {
  color: var(--bad);
}

.package-status {
  display: inline-flex;
  min-height: 24px;
  align-items: center;
  padding: 0 7px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.package-status.good {
  color: var(--good);
}

.package-status.bad {
  background: #fef3f2;
  color: var(--bad);
}

.detail-lists {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.detail-lists h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.detail-lists ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: #111827;
  color: #fff;
  padding: 12px 16px;
  border-radius: 8px;
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.22);
  z-index: 20;
}

@media (max-width: 760px) {
  .shell {
    padding: 14px 12px 86px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-actions,
  .top-actions input {
    width: 100%;
  }

  .finance-workflow-head {
    align-items: stretch;
    flex-direction: column;
  }

  .finance-step-nav {
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .finance-step-nav a:nth-child(2) {
    border-right: 0;
  }

  .finance-step-nav a:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line-soft);
  }

  .finance-equations {
    grid-template-columns: 1fr;
  }

  .finance-equation {
    display: flex;
    flex-wrap: wrap;
  }

  .finance-equation small {
    width: 100%;
  }

  .tabs {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
    border-top: 1px solid var(--line);
  }

  .tabs button {
    min-height: 42px;
    font-size: 13px;
  }

  .kpi-grid,
  .kpi-grid.compact,
  .analysis-grid,
  .form-grid,
  .student-filter-panel,
  .detail-grid,
  .detail-lists {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .student-list-summary {
    grid-template-columns: minmax(0, 1.5fr) minmax(90px, 0.8fr) minmax(90px, 0.8fr) 22px;
  }

  .student-list-summary .teacher-field {
    display: none;
  }

  .student-card-badges {
    grid-column: 1 / -2;
    justify-content: flex-start;
  }

  .student-list-chevron {
    grid-column: -2;
    grid-row: 1;
  }

  .student-card-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding-left: 12px;
  }

  .student-expanded-detail {
    padding: 12px;
  }

  .package-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .package-row-title {
    border-right: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .section-title.with-controls {
    align-items: stretch;
    flex-direction: column;
  }

  .filter-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .history-filter-row {
    width: 100%;
    grid-template-columns: 1fr 1fr;
  }

  .history-title {
    flex-direction: column;
  }

  .history-title > div:first-child {
    width: 100%;
  }

  #historicalLessonSummary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .inline-query-form {
    width: 100%;
    min-width: 0;
    grid-template-columns: 1fr auto;
  }

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

  .history-filter-row input {
    grid-column: 1 / -1;
  }

  .filter-row select {
    min-width: 0;
  }

  .filter-row > .searchable-student-select {
    grid-template-columns: 1fr;
    min-width: 0;
    width: 100%;
  }

  .wide {
    grid-column: 1 / -1;
  }

  .kpi strong {
    font-size: 22px;
  }
}

@media (max-width: 420px) {
  .kpi-grid,
  .kpi-grid.compact,
  .analysis-grid,
  .form-grid,
  .student-filter-panel,
  .student-card-metrics,
  .detail-grid,
  .detail-lists {
    grid-template-columns: 1fr;
  }

  .finance-workflow-head h2 {
    font-size: 24px;
  }

  .company-health-grid .kpi:first-child {
    grid-column: auto;
  }

  .finance-stage-head {
    align-items: flex-start;
  }

  .finance-panel summary {
    align-items: flex-start;
    flex-direction: column;
    gap: 3px;
  }

  .finance-panel summary small {
    text-align: left;
  }

  .package-history-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .package-row {
    grid-template-columns: 1fr;
  }

  .student-list-summary {
    grid-template-columns: minmax(0, 1fr) minmax(80px, auto) 20px;
    gap: 8px;
  }

  .student-list-summary .teacher-field {
    display: none;
  }

  .student-name-block {
    grid-column: 1 / 3;
  }

  .student-list-summary .remaining-field {
    grid-column: 1;
    grid-row: 2;
  }

  .student-list-summary .debt-field {
    grid-column: 2;
    grid-row: 2;
  }

  .student-card-badges {
    grid-column: 1 / -1;
    grid-row: 3;
    justify-content: flex-start;
  }

  .student-list-chevron {
    grid-column: 3;
    grid-row: 1;
  }

  .filter-row {
    grid-template-columns: 1fr;
  }

  .inline-query-form,
  .query-summary {
    grid-template-columns: 1fr;
  }
}

/* Visual system refresh: the darker blue now marks structure, not every edge. */
html {
  background: var(--bg);
}

body {
  font-size: 16px;
  line-height: 1.45;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 8px 12px;
  transform: translateY(-160%);
  border-radius: 6px;
  background: var(--brand-dark);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
}

.skip-link:focus-visible {
  transform: translateY(0);
  outline: 3px solid #fff;
  outline-offset: 2px;
}

button:focus-visible,
.button-link:focus-visible,
summary:focus-visible,
.student-list-summary:focus-visible {
  outline: 3px solid rgba(23, 109, 172, 0.34);
  outline-offset: 2px;
}

button:active,
.button-link:active {
  transform: translateY(1px);
}

.shell {
  max-width: 1260px;
  padding: 18px 24px 92px;
}

.login-view {
  max-width: 500px;
}

.brand-block {
  gap: 13px;
}

.brand-mark {
  overflow: hidden;
  border: 2px solid var(--brand-dark);
  border-radius: 50%;
  background: #fff;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transform: scale(1.12);
}

.brand-block h1 {
  font-size: 28px;
}

.login-panel {
  border-color: var(--line);
  box-shadow: 0 14px 36px rgba(14, 47, 84, 0.08);
}

.app-brand {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 11px;
}

.app-brand-mark {
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
  object-fit: cover;
  transform: scale(1.08);
  border: 2px solid var(--brand-dark);
  border-radius: 50%;
  background: #fff;
}

.app-brand-name {
  display: block;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.topbar {
  min-height: 78px;
  margin-bottom: 0;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--line);
}

.topbar h1 {
  margin-top: 1px;
  font-size: 28px;
  line-height: 1.18;
}

.eyebrow {
  color: var(--muted);
  font-size: 13px;
}

.top-actions {
  gap: 9px;
}

.top-actions input {
  border-color: var(--line);
  color: var(--brand-dark);
  font-weight: 700;
}

.icon-btn {
  min-width: 58px;
}

.tabs {
  top: 0;
  gap: 5px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.tabs button {
  min-height: 42px;
  border-color: transparent;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
}

.tabs button:hover,
.tabs button:focus-visible {
  background: var(--brand-soft);
  color: var(--brand-dark);
}

.tabs button.active,
.tabs button.active:hover {
  border-color: var(--brand-dark);
  background: var(--brand-dark);
  color: #fff;
}

.tabs.teacher-tabs {
  grid-template-columns: minmax(180px, 240px);
  justify-content: start;
}

.view {
  gap: 20px;
}

.dashboard-group {
  gap: 12px;
}

.dashboard-group + .dashboard-group {
  margin-top: 8px;
}

.section-title {
  min-height: 44px;
  align-items: center;
  margin-top: 10px;
  padding: 13px 0 0;
  border-top: 2px solid var(--line-strong);
}

.section-title h2 {
  font-size: 21px;
  line-height: 1.25;
}

.section-title span {
  font-size: 13px;
}

.kpi-grid,
.kpi-grid.compact,
.analysis-grid {
  gap: 12px;
}

.kpi {
  min-height: 128px;
  padding: 16px;
  border-color: var(--line);
  box-shadow: none;
}

.kpi span,
.kpi small,
label span,
th {
  font-size: 13px;
}

.kpi strong {
  margin-top: 11px;
  font-size: 28px;
  font-variant-numeric: tabular-nums;
}

.company-health-grid .kpi:first-child,
.kpi.profit-good {
  border-color: var(--brand-dark);
  background: var(--brand-dark);
}

.company-health-grid .kpi:first-child span,
.company-health-grid .kpi:first-child small,
.company-health-grid .kpi:first-child strong,
.kpi.profit-good span,
.kpi.profit-good small,
.kpi.profit-good strong {
  color: #fff;
}

.analysis-card,
.detail-panel,
.student-card,
.notice-card,
.alert-item,
.form-grid,
.table-wrap,
.close-list,
.audit-list {
  border-color: var(--line);
  box-shadow: none;
}

.analysis-card {
  min-height: 250px;
  padding: 16px;
}

.chart-head h3,
.detail-head h2 {
  font-size: 17px;
}

.bar-track {
  background: #e2edf6;
}

.table-wrap {
  position: relative;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--brand) #edf4f9;
  scrollbar-width: thin;
}

th,
td {
  border-bottom-color: var(--line);
}

th {
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-weight: 800;
}

td,
.student-list-field strong,
.student-metric strong,
.package-field strong,
.finance-equation strong {
  font-variant-numeric: tabular-nums;
}

.form-grid {
  padding: 16px;
}

.form-heading {
  position: relative;
  padding: 0 0 10px 12px;
  border-bottom-color: var(--line);
}

.form-heading::before {
  position: absolute;
  top: 0;
  bottom: 10px;
  left: 0;
  width: 3px;
  border-radius: 3px;
  background: var(--brand);
  content: "";
}

.student-filter-panel,
.action-row,
.student-lesson-query {
  border-color: var(--line);
  background: #f8fbfe;
}

.student-card {
  border-color: var(--line);
}

.student-card.selected {
  border-color: var(--brand);
  box-shadow: 0 0 0 2px rgba(23, 109, 172, 0.14);
}

.student-list-summary:hover {
  background: #f8fbfe;
}

.student-card-metrics,
.student-expanded-detail {
  border-top-color: var(--line);
}

.student-metric,
.detail-grid span {
  border-color: var(--line);
  background: #f8fbfe;
}

.finance-workflow-head {
  padding: 20px 0 15px;
  border-bottom-color: var(--line-strong);
}

.finance-workflow-head h2 {
  font-size: 27px;
}

.finance-panel,
.finance-step-nav {
  border-color: var(--line);
}

.finance-step-nav a {
  border-right-color: var(--line);
  background: #f8fbfe;
}

.finance-panel summary,
.workflow-panel-status {
  background: #f8fbfe;
}

.toast {
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: var(--brand-dark);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (max-width: 760px) {
  .shell {
    padding: 14px 12px calc(112px + env(safe-area-inset-bottom));
  }

  .topbar {
    gap: 12px;
    min-height: auto;
    padding-bottom: 12px;
  }

  .app-brand-mark {
    width: 42px;
    height: 42px;
  }

  .topbar h1 {
    font-size: 25px;
  }

  .tabs {
    top: auto;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
    border-top-color: var(--line-strong);
  }

  .tabs button {
    min-height: 38px;
    padding: 0 4px;
    font-size: 13px;
  }

  .tabs.teacher-tabs {
    grid-template-columns: 1fr;
  }

  .section-title {
    align-items: flex-start;
    flex-direction: column;
    gap: 3px;
  }

  .section-title h2 {
    font-size: 20px;
  }

  .kpi {
    min-height: 116px;
  }

  .kpi strong {
    font-size: 24px;
  }

  .analysis-card {
    min-height: 220px;
  }
}