:root {
  color-scheme: light;
  /* Typography */
  --font-sans: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 1rem;
  --font-size-h3: 1rem;
  --font-size-h2: 1.5rem;
  --font-size-h1: 1.875rem;
  --font-weight-regular: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing and shape */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 1.75rem;
  --space-8: 2rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --control-height: 2.75rem;
  --shadow-card: 0 0.875rem 2rem rgb(23 32 42 / 6%);
  --focus-ring: 0 0 0 3px rgb(30 92 138 / 28%);

  /* Surfaces and text */
  --color-canvas: #edf1f5;
  --color-surface: #ffffff;
  --color-surface-subtle: #f8fafc;
  --color-surface-strong: #17202a;
  --color-border: #d8e0e8;
  --color-border-strong: #cbd6df;
  --color-text: #17202a;
  --color-text-strong: #22313d;
  --color-text-muted: #667789;
  --color-text-inverse: #ffffff;
  --color-text-inverse-muted: #dce5eb;
  --color-border-inverse: rgb(255 255 255 / 16%);
  --color-surface-inverse-subtle: rgb(255 255 255 / 8%);
  --color-neutral: #98a7b4;

  /* Semantic colors */
  --color-primary: #1e5c8a;
  --color-primary-subtle: #e8f2f9;
  --color-primary-hover: #174a70;
  --color-primary-active: #123a58;
  --color-accent: #98c379;
  --color-success: #2f5d36;
  --color-warning: #8a5a14;
  --color-danger: #9b2c2c;
  --color-danger-strong: #b42318;
  --color-danger-hover: #8f1c13;

  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-canvas);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-width: 20rem;
  background: var(--color-canvas);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 0;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-3);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  min-height: var(--control-height);
  transition: background-color 160ms ease, box-shadow 160ms ease, opacity 160ms ease;
}

button:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

button:active:not(:disabled) {
  background: var(--color-primary-active);
}

button.secondary,
.nav button,
.nav a,
#logoutButton {
  background: var(--color-border);
  color: var(--color-text-strong);
}

button.secondary:hover:not(:disabled),
.nav button:hover:not(:disabled),
.nav a:hover,
#logoutButton:hover:not(:disabled) {
  background: var(--color-border-strong);
}

input,
select,
textarea {
  width: 100%;
  min-height: var(--control-height);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  padding: var(--space-2) var(--space-3);
  color: var(--color-text);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

button:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"],
.field-error {
  border-color: var(--color-danger);
}

textarea {
  min-height: 86px;
  resize: vertical;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
}

.app-shell:not(.is-authenticated) {
  grid-template-columns: minmax(0, 1fr);
}

.app-shell:not(.is-authenticated) .workspace {
  min-height: 100vh;
  align-content: center;
}

.sidebar {
  background: var(--color-surface-strong);
  color: var(--color-text-inverse);
  padding: var(--space-7) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-7);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 20;
}

.sidebar-brand {
  display: grid;
  gap: var(--space-1);
}

.eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--color-accent);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: var(--font-size-xs);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: var(--font-size-h1);
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: var(--font-size-h2);
  letter-spacing: 0;
}

h3 {
  margin-bottom: var(--space-3);
  font-size: var(--font-size-h3);
  letter-spacing: 0;
}

.nav {
  display: grid;
  gap: var(--space-2);
}

.nav a,
.nav button {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  text-align: left;
  text-decoration: none;
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
}

.nav-icon {
  display: inline-grid;
  width: 1.25rem;
  min-width: 1.25rem;
  place-items: center;
  font-size: 1.125rem;
}

.nav .active {
  background: var(--color-accent);
  color: var(--color-text);
  box-shadow: inset 0 0 0 2px var(--color-text);
}

.nav .active::after {
  margin-left: auto;
  content: "Поточний";
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
}

.nav button:disabled {
  opacity: 0.45;
}

.sidebar-footer {
  display: grid;
  gap: var(--space-3);
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-inverse);
}

.sidebar .profile-summary {
  text-align: left;
}

.sidebar .profile-summary span {
  color: var(--color-text-inverse-muted);
}

.sidebar-logout {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.api-docs-link {
  color: var(--color-text-inverse-muted);
  font-size: var(--font-size-sm);
}

.workspace {
  padding: var(--space-6);
  display: grid;
  gap: var(--space-5);
  align-content: start;
}

.app-header,
.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.app-header {
  min-height: 4.5rem;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.header-start,
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.header-start h2,
.profile-summary strong,
.profile-summary span {
  overflow-wrap: anywhere;
}

.profile-summary {
  display: grid;
  gap: var(--space-1);
  text-align: right;
}

.profile-summary span {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.mobile-menu-button,
.mobile-menu-close,
.mobile-profile-button,
.navigation-backdrop,
.bottom-navigation {
  display: none;
}

.bottom-navigation {
  position: fixed;
  z-index: 30;
  right: 0;
  bottom: 0;
  left: 0;
  padding: var(--space-2) var(--space-4) calc(var(--space-2) + env(safe-area-inset-bottom));
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: 0 -0.25rem 1rem rgb(23 32 42 / 8%);
}

.bottom-navigation-item {
  display: grid;
  min-width: 4.5rem;
  min-height: var(--control-height);
  place-items: center;
  gap: var(--space-1);
  margin: 0 auto;
  padding: var(--space-1) var(--space-3);
  background: transparent;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.bottom-navigation-item:hover:not(:disabled),
.bottom-navigation-item:active:not(:disabled) {
  background: var(--color-primary-subtle);
  color: var(--color-primary-active);
}

.bottom-navigation-item[aria-current="page"] {
  color: var(--color-primary-active);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: var(--space-1);
}

.login-screen {
  width: min(100%, 28rem);
  display: grid;
  gap: var(--space-6);
  margin: auto;
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.login-brand h1 {
  margin-bottom: var(--space-4);
}

.login-brand h2 {
  margin-bottom: var(--space-2);
}

.login-brand .muted {
  margin-bottom: 0;
}

.login-screen .login-form {
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.login-field {
  display: grid;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
}

.login-feedback {
  min-height: var(--space-5);
  margin: 0;
  color: var(--color-danger);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

.login-submit {
  width: 100%;
}

.login-form.is-submitting {
  cursor: wait;
}

.login-form,
.grid-form {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
  flex: 1;
}

.toast-region {
  position: fixed;
  z-index: 200;
  right: var(--space-4);
  bottom: var(--space-4);
  display: grid;
  gap: var(--space-2);
  width: min(26rem, calc(100vw - var(--space-8)));
}

.toast {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-success);
  border-left-width: 0.25rem;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text-strong);
  box-shadow: var(--shadow-card);
  font-weight: var(--font-weight-semibold);
}

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

body:has(#testRunner:not([hidden])) .toast-region {
  bottom: calc(var(--control-height) + var(--space-7));
}

.admin-section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.admin-section-button.active {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.admin-section {
  min-height: 22rem;
}

.admin-user-form {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-content: start;
  max-width: 60rem;
}

.admin-user-form label {
  display: grid;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
}

.admin-user-form .item-actions {
  align-items: end;
  margin-top: 0;
}

.view {
  display: none;
  gap: var(--space-4);
}

.view.active {
  display: grid;
}

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

.panel-form,
.data-grid > div,
#adminView {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
}

.panel-form:focus-within,
.data-grid > div:focus-within {
  box-shadow: var(--shadow-card), var(--focus-ring);
}

.panel-form.is-error,
.data-grid > div.is-error {
  border-color: var(--color-danger);
}

.panel-form.is-disabled,
.data-grid > div.is-disabled {
  opacity: 0.55;
}

.panel-form {
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.lesson-group-picker {
  position: relative;
  display: grid;
  gap: var(--space-2);
}

.lesson-group-options {
  position: absolute;
  z-index: 2;
  top: 100%;
  right: 0;
  left: 0;
  display: grid;
  max-height: 12rem;
  overflow-y: auto;
  margin-top: 2px;
  padding: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  box-shadow: 0 0.5rem 1rem rgb(23 32 42 / 12%);
}

.lesson-group-option {
  width: 100%;
  min-height: 0;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text);
  cursor: pointer;
  text-align: left;
  background: transparent;
  border: 0;
  border-radius: 0;
  font-weight: var(--font-weight-regular);
}

.lesson-group-option + .lesson-group-option {
  border-top: 1px solid var(--color-border);
}

.lesson-group-option:not(.is-empty):hover,
.lesson-group-option:not(.is-empty):focus-visible {
  color: var(--color-text);
  background: var(--color-surface-subtle);
}

.lesson-group-option.is-empty {
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-muted);
  cursor: default;
}

.lesson-materials-fieldset {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.lesson-materials-fieldset legend {
  padding: 0 var(--space-1);
  font-weight: var(--font-weight-bold);
}

.lesson-materials-fields {
  display: grid;
  gap: var(--space-2);
}

.lesson-material-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr) auto;
  gap: var(--space-2);
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

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

.teacher-tools {
  margin-top: var(--space-1);
}

.teacher-review {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
}

body.has-open-dialog {
  overflow: hidden;
}

.app-dialog {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  align-content: start;
  gap: var(--space-4);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--space-6);
  border: 0;
  border-radius: 0;
  background: var(--color-surface);
  box-shadow: none;
}

.app-dialog > .section-heading {
  position: sticky;
  top: calc(var(--space-6) * -1);
  z-index: 1;
  margin: calc(var(--space-6) * -1) calc(var(--space-6) * -1) 0;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.compact-list {
  max-height: 140px;
  overflow-y: auto;
}

.item-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

.item-actions button {
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-sm);
}

.material-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  text-decoration: none;
}

.material-link:hover {
  background: var(--color-surface-alt);
}

.group-member-add {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  gap: var(--space-3);
}

.student-picker,
.group-member-picker,
.group-members-section {
  display: grid;
  gap: var(--space-3);
  min-width: 0;
}

.student-picker {
  margin: 0;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.student-picker legend {
  padding: 0 var(--space-1);
  font-weight: var(--font-weight-bold);
}

.student-picker label,
.group-member-picker label {
  display: grid;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
}

.group-details-grid {
  display: grid;
  grid-template-columns: minmax(18rem, 0.8fr) minmax(0, 1.2fr);
  align-items: start;
  gap: var(--space-4);
  width: min(100%, 72rem);
}

.group-member-picker,
.group-members-section,
.groups-catalog-list {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-subtle);
}

.groups-catalog-list {
  width: min(100%, 72rem);
  background: var(--color-surface);
}

.assignment-wizard-heading,
.assignment-wizard-step,
.assignment-recipient-controls,
.assignment-rule-fields,
.catalog-search {
  display: grid;
  gap: var(--space-3);
}

.assignment-wizard-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: wizard-step;
}

.assignment-wizard-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.assignment-wizard-steps li::before {
  counter-increment: wizard-step;
  content: counter(wizard-step);
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--color-surface-strong);
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
}

.assignment-wizard-steps li.is-active {
  border-color: var(--color-primary);
  background: var(--color-primary-subtle);
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
}

.assignment-wizard-steps li.is-active::before,
.assignment-wizard-steps li.is-complete::before {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.assignment-wizard-step,
.assignment-recipient-controls,
.assignment-rule-fields {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-subtle);
}

.assignment-wizard-step label,
.assignment-recipient-controls label,
.assignment-rule-fields label,
.catalog-search {
  font-weight: var(--font-weight-bold);
}

.assignment-wizard-actions {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
}

.assignment-wizard-actions button:last-child:not(:only-child) {
  margin-left: auto;
}

.assignments-catalog-list {
  width: min(100%, 72rem);
}

.test-workflow-grid {
  display: grid;
  grid-template-columns: minmax(18rem, 0.8fr) minmax(0, 1.2fr);
  align-items: start;
  gap: var(--space-4);
  width: min(100%, 78rem);
}

.test-workflow-section {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-subtle);
}

.assignment-card-meta {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

.question-editor-form {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.question-editor-form label {
  display: grid;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
}

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

.checkbox-field {
  display: flex !important;
  align-items: center;
  gap: var(--space-2);
}

.checkbox-field input {
  width: auto;
  min-height: auto;
}

.editor-rows {
  display: grid;
  gap: var(--space-2);
}

.editor-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: var(--space-2);
}

.editor-row.matching-row {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
}

.test-pools-editor {
  display: grid;
  gap: var(--space-3);
}

.test-pool-editor-row {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-subtle);
}

.test-pool-editor-heading {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.test-pool-editor-heading .danger-button {
  min-height: 44px;
}

.test-pool-editor-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.test-pool-editor-fields label {
  display: grid;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
}

.editor-row label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  white-space: nowrap;
}

.editor-row label input {
  width: auto;
  min-height: auto;
}

.lab-check-job {
  border-left: 4px solid var(--color-primary);
}

.lab-check-job.stale {
  border-left-color: var(--color-neutral);
  opacity: 0.82;
}

.lab-check-result {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
}

.lab-check-result.pass strong {
  color: var(--color-success);
}

.lab-check-result.fail strong {
  color: var(--color-danger);
}

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

.teacher-dashboard {
  display: grid;
  gap: var(--space-4);
}

.teacher-section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--color-border);
}

.teacher-section {
  display: grid;
  gap: var(--space-4);
}

.teacher-section-intro {
  display: grid;
  gap: var(--space-2);
}

.teacher-section-intro h3,
.teacher-section-intro p {
  margin: 0;
}

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

.student-dashboard {
  display: grid;
  gap: var(--space-4);
}

.student-groups-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.student-group-card {
  display: grid;
  align-content: start;
  gap: var(--space-3);
  min-height: 10rem;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-subtle);
}

.student-group-card.is-selected {
  border-color: var(--color-primary);
  background: var(--color-primary-subtle);
  box-shadow: var(--focus-ring);
}

.student-group-card .item-actions {
  margin-top: auto;
}

.student-group-materials-content {
  display: grid;
  gap: var(--space-4);
}

.student-group-materials-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.student-group-materials-section {
  display: grid;
  align-content: start;
  gap: var(--space-3);
}

.student-group-materials-section h4,
.student-group-materials-section .muted {
  margin: 0;
}

.student-next-action {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-5);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  background: var(--color-primary-subtle);
  box-shadow: var(--shadow-card);
}

.student-next-action h3,
.student-next-action-description {
  margin-bottom: 0;
}

.student-next-action-description {
  max-width: 52rem;
  color: var(--color-text-muted);
}

.student-next-action .item-actions {
  margin-top: var(--space-2);
}

.student-dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.student-dashboard-panel .section-heading {
  align-items: flex-start;
}

.student-dashboard-panel .section-heading h3,
.student-dashboard-panel .section-heading .muted {
  margin-bottom: 0;
}

.teacher-dashboard-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.context-selector-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  width: min(100%, 56rem);
}

.context-selector-grid label {
  display: grid;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
}

.attendance-week-navigation {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: var(--space-2);
}

.attendance-week-navigation strong {
  display: flex;
  align-items: center;
  min-height: var(--control-height);
  padding: 0 var(--space-2);
}

.attendance-calendar {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: var(--space-2);
  width: 100%;
}

.attendance-calendar-day {
  display: grid;
  align-content: start;
  gap: var(--space-2);
  min-height: 15rem;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-subtle);
}

.attendance-calendar-day.is-today {
  border-color: var(--color-primary);
  box-shadow: inset 0 0 0 1px var(--color-primary);
}

.attendance-calendar-day h4 {
  margin: 0;
  color: var(--color-text-strong);
  font-size: var(--font-size-sm);
  text-transform: capitalize;
}

.attendance-calendar-empty {
  margin: var(--space-2) 0 0;
}

.attendance-lesson-card {
  display: grid;
  min-height: 0;
  gap: var(--space-1);
  padding: var(--space-2);
  border: 1px solid var(--color-primary);
  color: var(--color-primary-active);
  background: var(--color-primary-subtle);
  text-align: left;
}

.attendance-lesson-card:hover:not(:disabled),
.attendance-lesson-card.is-selected {
  color: var(--color-text-inverse);
  background: var(--color-primary);
}

.attendance-lesson-card span {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-regular);
}

.teacher-create-menu {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.teacher-summary-grid,
.teacher-dashboard-grid {
  display: grid;
  gap: var(--space-3);
}

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

.teacher-summary-card {
  display: grid;
  gap: var(--space-1);
  min-height: 7rem;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.teacher-summary-card span {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.teacher-summary-card strong {
  align-self: end;
  color: var(--color-primary);
  font-size: var(--font-size-h1);
}

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

.teacher-dashboard-lessons {
  grid-column: span 2;
}

.teacher-create-dialog .teacher-create-forms {
  display: grid;
  gap: var(--space-4);
}

.teacher-create-dialog [data-create-form] {
  grid-column: 1 / -1;
  width: min(100%, 46rem);
  justify-self: start;
}

.list {
  display: grid;
  gap: var(--space-2);
}

.item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  background: var(--color-surface-subtle);
  display: grid;
  gap: var(--space-1);
}

.item strong,
.item span,
.item p {
  overflow-wrap: anywhere;
}

.item:focus-within {
  box-shadow: var(--focus-ring);
}

.item.is-error {
  border-color: var(--color-danger);
}

.item.is-disabled {
  opacity: 0.55;
}

.empty-state {
  min-height: var(--control-height);
  align-content: center;
  border-style: dashed;
  color: var(--color-text-muted);
}

.student-assignment > p {
  margin: var(--space-1) 0;
}

.submission-items {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.submission-item {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.submission-item > p {
  margin: 0;
}

.submission-requirement {
  width: fit-content;
  padding: 0.125rem var(--space-2);
  border-radius: 999px;
  background: var(--color-primary-subtle);
  color: var(--color-primary-active);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
}

.submission-status {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-left-width: 0.25rem;
  border-radius: var(--radius-sm);
  background: var(--color-surface-subtle);
}

.submission-status span {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.submission-status.is-pending {
  border-left-color: var(--color-warning);
}

.submission-status.is-checked {
  border-left-color: var(--color-success);
}

.submission-status.is-flagged,
.submission-status.is-failed {
  border-left-color: var(--color-danger);
}

.submission-status.is-missing {
  border-left-color: var(--color-neutral);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-semibold);
}

.submission-upload-zone {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface-subtle);
  cursor: pointer;
}

.submission-upload-zone:focus-within,
.submission-upload-zone:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-subtle);
}

.submission-file-input {
  padding: 0;
  border: 0;
  min-height: var(--control-height);
  background: transparent;
}

.submission-upload-feedback {
  min-height: var(--space-5);
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.submission-upload-feedback.error {
  color: var(--color-danger);
  font-weight: var(--font-weight-semibold);
}

.submission-upload-progress {
  width: 100%;
  height: var(--space-2);
  accent-color: var(--color-primary);
}

.runner-countdown {
  margin: 0;
  color: var(--color-danger);
  font-weight: var(--font-weight-bold);
}

.runner-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-3) var(--space-5);
  align-items: start;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.runner-header h3,
.runner-header .muted {
  margin-bottom: 0;
}

.runner-progress {
  display: grid;
  gap: var(--space-2);
}

.runner-progress-summary {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.runner-progress-summary strong {
  color: var(--color-text-strong);
}

.runner-progress progress {
  width: 100%;
  height: var(--space-2);
  accent-color: var(--color-primary);
}

.runner-timer {
  display: grid;
  justify-items: end;
  gap: var(--space-1);
  min-width: max-content;
  font-size: var(--font-size-sm);
}

.runner-timer .muted {
  text-align: right;
}

.runner-question-jump {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.runner-question-jump-button {
  min-width: var(--control-height);
  padding-inline: var(--space-2);
  background: var(--color-border);
  color: var(--color-text-strong);
}

.runner-question-jump-button.is-answered {
  background: var(--color-primary-subtle);
  color: var(--color-primary-active);
}

.runner-question-jump-button.is-current {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.runner-navigation {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
}

.runner-finish-actions {
  position: sticky;
  bottom: var(--space-3);
  display: flex;
  justify-content: flex-end;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface) 94%, transparent);
  box-shadow: var(--shadow-card);
}

.runner-confirm-content {
  display: grid;
  align-content: center;
  gap: var(--space-4);
  max-width: 42rem;
  min-height: 12rem;
}

.runner-question label {
  display: grid;
  gap: var(--space-1);
}

.runner-question label:has(input) {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.runner-question label input[type="radio"],
.runner-question label input[type="checkbox"] {
  width: auto;
  min-height: auto;
}

.runner-save-status {
  min-height: var(--space-5);
  margin: 0;
}

.runner-restriction-notice {
  min-height: var(--space-5);
  margin: 0;
  color: var(--color-warning);
}

.media-preview {
  display: grid;
  gap: var(--space-2);
}

.protected-media {
  width: min(100%, 720px);
  max-height: 440px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  object-fit: contain;
}

iframe.protected-media {
  min-height: 320px;
}

.danger-button {
  margin-left: auto;
  background: var(--color-danger-strong);
}

.danger-button:hover:not(:disabled) {
  background: var(--color-danger-hover);
}

.danger-button:active:not(:disabled) {
  background: var(--color-danger);
}

.muted {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

@media (min-width: 768px) and (max-width: 1279px) {
  .app-shell.is-authenticated {
    grid-template-columns: 13.5rem minmax(0, 1fr);
  }

  .sidebar {
    padding: var(--space-5) var(--space-4);
  }

  .columns,
  .data-grid,
  .data-grid.two,
  .question-editor-form,
  .login-form,
  .grid-form {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .test-pool-editor-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .teacher-summary-grid,
  .teacher-dashboard-grid,
  .student-dashboard-grid,
  .student-groups-list,
  .student-group-materials-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .context-selector-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .teacher-dashboard-lessons {
    grid-column: 1 / -1;
  }

  .group-member-add {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .group-member-add > button {
    grid-column: 1 / -1;
  }

  .header-actions,
  .header-start {
    justify-content: space-between;
  }
}

@media (max-width: 767px) {
  .app-shell.is-authenticated {
    grid-template-columns: minmax(0, 1fr);
  }

  .workspace {
    padding: var(--space-4);
    padding-bottom: calc(5.5rem + env(safe-area-inset-bottom));
  }

  .columns,
  .data-grid,
  .data-grid.two,
  .teacher-data-grid,
  .teacher-summary-grid,
  .teacher-dashboard-grid,
  .student-dashboard-grid,
  .student-groups-list,
  .student-group-materials-grid,
  .group-member-add,
  .group-details-grid,
  .test-workflow-grid,
  .question-editor-form,
  .editor-row,
  .editor-row.matching-row,
  .test-pool-editor-fields,
  .login-form,
  .grid-form {
    grid-template-columns: minmax(0, 1fr);
  }

  .app-header,
  .section-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .section-heading > button,
  .group-member-add > button,
  .item-actions > button {
    width: 100%;
  }

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

  .item-actions > .danger-button {
    margin-left: 0;
  }

  .teacher-dashboard-actions,
  .teacher-create-menu {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .teacher-dashboard-actions > button,
  .teacher-create-menu > button {
    width: 100%;
  }

  .teacher-section-nav {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: var(--space-1);
    scroll-snap-type: x proximity;
  }

  .teacher-section-nav > button {
    flex: 0 0 auto;
    scroll-snap-align: start;
  }

  .teacher-dashboard-lessons {
    grid-column: auto;
  }

  .context-selector-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .attendance-calendar {
    grid-template-columns: minmax(0, 1fr);
  }

  .attendance-calendar-day {
    min-height: 0;
  }

  .assignment-wizard-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .assignment-wizard-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .assignment-wizard-actions button:last-child:not(:only-child) {
    margin-left: 0;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(19rem, 86vw);
    height: 100dvh;
    transform: translateX(-100%);
    transition: transform 180ms ease;
    box-shadow: var(--shadow-card);
  }

  .app-shell.is-menu-open .sidebar {
    transform: translateX(0);
  }

  .navigation-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 10;
    border: 0;
    border-radius: 0;
    background: rgb(23 32 42 / 52%);
    padding: 0;
  }

  .mobile-menu-button,
  .mobile-menu-close,
  .mobile-profile-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .mobile-menu-close {
    align-self: start;
    width: auto;
  }

  .mobile-menu-button,
  .mobile-profile-button {
    width: var(--control-height);
    padding: 0;
    font-size: 1.25rem;
  }

  .mobile-profile-button {
    align-self: center;
  }

  .app-header {
    align-items: stretch;
  }

  .header-actions,
  .header-start {
    align-items: flex-start;
  }

  .header-actions {
    flex-wrap: wrap;
  }

  .profile-summary {
    text-align: left;
  }

  .bottom-navigation:not([hidden]) {
    display: block;
  }

  .login-screen {
    margin: var(--space-6) auto;
    padding: var(--space-6);
  }

  .login-screen .login-form {
    grid-template-columns: minmax(0, 1fr);
  }

  .app-dialog {
    padding: var(--space-4);
  }

  .app-dialog > .section-heading {
    top: calc(var(--space-4) * -1);
    margin: calc(var(--space-4) * -1) calc(var(--space-4) * -1) 0;
    padding: var(--space-3) var(--space-4);
  }

  .runner-header {
    grid-template-columns: minmax(0, 1fr);
  }

  .runner-timer {
    justify-items: start;
  }

  .runner-timer .muted {
    text-align: left;
  }

  .runner-navigation > button,
  .runner-finish-actions > button {
    flex: 1 1 0;
  }
}