.aura-title,
.practice-page .page-title {
  font-size: clamp(30px, 4.1vw, 44px);
  font-weight: 650;
  line-height: 1.12;
  letter-spacing: -.035em;
}
.aura-title { margin-bottom: 20px; }

.course-catalogue,
.class-work-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.teacher-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.class-work-grid { margin-block-start: 20px; }
.class-work-grid > [role="status"] { grid-column: 1 / -1; }
.class-work-grid > button { justify-self: start; grid-column: 1 / -1; }
.tournament-invite { margin-block-start: 20px; }

:is(.course-cover, .class-work-card, .teacher-card, .lab-index-card, .simulation-card) {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--bright-tile-radius);
  background: var(--surface);
  box-shadow: var(--md-elevation-1);
  animation: card-enter 240ms var(--bright-motion-ease) backwards;
}
:is(.course-cover, .class-work-card, .teacher-card, .lab-index-card):nth-child(2) { animation-delay: 25ms; }
:is(.course-cover, .class-work-card, .teacher-card, .lab-index-card):nth-child(3) { animation-delay: 50ms; }
:is(.course-cover, .class-work-card, .teacher-card, .lab-index-card):nth-child(4) { animation-delay: 75ms; }
:is(.course-cover, .class-work-card, .teacher-card, .lab-index-card):nth-child(5) { animation-delay: 100ms; }
@keyframes card-enter { from { opacity: .88; transform: translateY(5px); } }

.course-cover {
  display: grid;
  grid-template-rows: 128px 1fr;
  color: var(--ink);
}
.course-cover-art {
  overflow: hidden;
  border-start-start-radius: calc(var(--bright-tile-radius) - 1px);
  border-start-end-radius: calc(var(--bright-tile-radius) - 1px);
  background: var(--md-surface-container);
}
.course-cover-art img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  transition: transform 220ms var(--bright-motion-ease);
}
.course-cover-copy {
  display: flex;
  flex-direction: column;
  align-items: start;
  gap: 6px;
  min-width: 0;
  padding: 16px 20px;
}
.course-cover h2, .class-work-card h2, .teacher-card h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.25;
  font-weight: 650;
  letter-spacing: -.02em;
  overflow-wrap: anywhere;
}
.course-cover-topic { color: var(--muted); font-size: 14px; margin-bottom: 4px; }
.course-cover-count { color: var(--muted); font-size: 13px; }
.course-cover-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  margin-top: auto;
  color: var(--md-primary);
  font-size: 14px;
  font-weight: 650;
}
.course-cover-action .m3-icon, .lab-card-action .m3-icon { font-size: 18px; transition: transform 180ms var(--bright-motion-ease); }
:is(.course-cover, .lab-index-card, .join-class-link) {
  transition: transform 180ms var(--bright-motion-ease), border-color 180ms ease, box-shadow 180ms ease;
}
:is(.course-cover, .lab-index-card, .join-class-link):focus-within { border-color: var(--md-primary); }
@media (hover: hover) and (pointer: fine) {
  :is(.course-cover, .lab-index-card, .join-class-link):hover {
    transform: translateY(-2px);
    border-color: #a6b4ff;
    box-shadow: var(--md-elevation-2);
  }
  .course-cover:hover img { transform: scale(1.035); }
  .course-cover:hover .m3-icon, .lab-card-link:hover .lab-card-action .m3-icon { transform: translateX(3px); }
}
:is(.course-cover, .lab-card-link, .join-class-link):active { transform: translateY(1px); }

.practice-page .practice-button { border-radius: var(--control-radius); }
.practice-page .practice-button:is(.primary, .secondary) { font-weight: 600; }
.practice-page .practice-button.secondary:not(:disabled) { background: var(--surface); }
.practice-page .practice-button.secondary:hover:not(:disabled) { background: var(--md-primary-container); }
.practice-page .practice-button.primary:hover { color: var(--md-on-primary); }
.practice-page .course-tabs {
  gap: 4px 20px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.practice-page .course-heading .course-tabs { margin: 0; }
.practice-page .course-tab {
  position: relative;
  min-height: 44px;
  padding-inline: 0;
  border-radius: 0;
  color: var(--muted);
  font-size: 14px;
}
.practice-page .course-tab:is([aria-current="page"], :hover) { color: var(--md-primary); background: transparent; }
.practice-page .course-tab[aria-current="page"]::after {
  position: absolute;
  inset: auto 0 -1px;
  height: 2px;
  background: currentColor;
  content: '';
  transform-origin: left;
  animation: current-tab 220ms var(--bright-motion-ease) both;
}
@keyframes current-tab { from { transform: scaleX(.25); } }

.practice-page .course-heading h1 { font-size: clamp(30px, 4.1vw, 44px); font-weight: 650; }
.practice-page .course-heading-title > span { font-size: 15px; }
.practice-page .course-banner {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  min-height: 0;
  gap: 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--bright-tile-radius);
  background: var(--surface);
  box-shadow: var(--md-elevation-1);
}
.practice-page .course-banner-media {
  width: 100%;
  justify-self: stretch;
  overflow: hidden;
  border-radius: 0;
}
.course-banner-media :is(canvas, .course-formula-plate) { display: block; width: 100%; border-radius: 0; }
.course-banner-media .course-formula-plate { display: grid; }
.practice-page .course-banner-copy { padding: clamp(16px, 3vw, 32px); }
.practice-page .course-banner-copy h2 { font-size: clamp(24px, 3vw, 37px); line-height: 1.15; overflow-wrap: anywhere; }
.practice-page .course-banner-copy .practice-button { margin-top: 14px; }
.course-banner > div { animation: card-enter 230ms var(--bright-motion-ease) both; }
.practice-page .course-lesson-tile.practice-button {
  min-height: 88px;
  padding: 10px;
  border-radius: var(--bright-tile-radius);
  background: var(--surface);
}
.course-lesson-tile :is(img, canvas) { border-radius: calc(var(--bright-tile-radius) / 2); }
.practice-page .course-lesson-tile[aria-pressed="true"] { background: var(--md-primary-container); border-color: var(--md-primary); }
.practice-page .course-section-picker select { border-radius: var(--control-radius); background: var(--surface); }
.practice-page .course-topics { margin-block-start: 32px; }
.practice-page .unit-card {
  --unit-inset: 8px;
  --unit-radius: var(--bright-tile-radius);
  border: 1px solid var(--line);
  background: var(--surface);
}
.practice-page .unit-card:is(:hover, :focus-within, .unit-current) { border-color: #a6b4ff; background: var(--md-primary-container); }
.unit-card .course-meter { max-width: 44ch; height: 6px; }
.practice-page .progress-panel { border: 1px solid var(--line); border-radius: var(--bright-tile-radius); }
.practice-page .progress-unit-list li {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  padding-inline-start: 18px;
  border-top: 0;
  border-inline-start: 1px solid var(--line);
}
.progress-unit-list li::before {
  position: absolute;
  inset: calc(50% - 4px) auto auto -4px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--line-strong);
  content: '';
}
.progress-unit-list li[data-progress="Завершено"]::before { background: var(--success); }
.progress-unit-list li[data-progress="У процесі"]::before { background: var(--md-primary); }
.practice-page .progress-unit-list span { text-align: right; white-space: normal; }

.join-profile {
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--bright-tile-radius);
  background: var(--surface);
}
.join-profile p { color: var(--muted); font-size: 14px; }
.join-profile .join-class-link { border: 0; box-shadow: none; padding-inline: 0; }
.class-work-card, .teacher-card {
  display: flex;
  flex-direction: column;
  align-items: start;
  gap: 8px;
  padding: clamp(16px, 2vw, 20px);
}
.event-header, .teacher-card-foot {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.class-work-icon, .lab-card-number {
  display: inline-grid;
  place-items: center;
  border-radius: 8px;
  color: var(--md-primary);
  background: var(--md-primary-container);
}
.class-work-icon { width: 38px; height: 38px; }
.work-facts {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 105px), 1fr));
  gap: 8px 12px;
  margin: 6px 0 8px;
}
.work-facts dt { color: var(--muted); font-size: 12px; }
.work-facts dd {
  margin: 3px 0 0;
  font-weight: 650;
  font-size: 14px;
  overflow-wrap: anywhere;
}
.class-work-card > .practice-button, .teacher-card-foot { margin-top: auto; }
.teacher-card-foot { padding-top: 12px; border-top: 1px solid var(--line); }
.teacher-card-foot .submission { display: flex; align-items: baseline; gap: 6px; margin: 0; color: var(--muted); font-size: 13px; }
.teacher-card .meta { margin: 0; color: var(--muted); font-size: 13px; }
.submission strong, .lab-reading-row dd, .demo-readings dd, .demo-range-label output { font-family: var(--bright-mono); }
.teacher-card .submission strong { font-size: 26px; color: var(--ink); }
.teacher-card .work-facts { border-top: 1px solid var(--line); padding-top: 12px; }
.page-heading > .button { min-height: 44px; }
.bright-teacher-context { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 0 0 18px; margin-bottom: 20px; border-bottom: 1px solid var(--line); }
.bright-teacher-context .teacher-context-links { display: flex; flex-wrap: wrap; gap: 4px; }
.teacher-context-links a { display: flex; gap: 7px; min-height: 44px; padding: 8px 12px; border-radius: 8px; }
.teacher-context-links a + a { border-top: 0; }
.bright-teacher-context .bright-heading, .teacher-context-links small, .teacher-context-links a > .bright-icon:last-child { display: none; }
.teacher-context-links strong { font-size: inherit; }
.teacher-context-links a[aria-current] { color: var(--accent); background: var(--accent-soft); }
.bright-teacher-context > .button { margin: 0; min-height: 44px; border-radius: var(--control-radius); }

.labs-page .labs-index-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; border: 0; }
.labs-page .lab-index-card { border-bottom: 1px solid var(--line); }
.labs-page .lab-index-card:is(:hover, :focus-within) { background: var(--surface); }
.labs-page .lab-card-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  align-content: start;
  gap: 14px;
  height: 100%;
  padding: 16px;
  border-radius: inherit;
}
.labs-page .lab-card-number {
  width: 38px;
  height: 38px;
  padding: 0;
  font: 600 14px/1 var(--bright-mono);
}
.labs-page .lab-card-copy h2 { font-size: 17px; }
.labs-page .lab-card-copy p { font-size: 14px; }
.labs-page .lab-card-action { display: inline-flex; align-items: center; gap: 6px; margin-top: 8px; font-size: 14px; white-space: normal; }

.simulation-card { display: grid; grid-template-columns: minmax(0, 1fr) minmax(240px, 310px); overflow: hidden; gap: 0; }
.simulation-card .sim-stage { grid-area: auto; aspect-ratio: 16 / 9; border-radius: 0; background: #111827; }
.simulation-card .sim-picker { grid-area: auto; padding: 20px; border-radius: 0; background: var(--surface); }
.simulation-card .sim-picker select { width: 100%; border-radius: var(--control-radius); }
.simulation-card .sim-credit { margin-block-end: 0; }
.simulation-page > .page-description { margin-block: 8px 16px; }
.simulation-page > .course-tabs { margin-block-start: 14px; }

@media (max-width: 980px) {
  .simulation-card { grid-template-columns: minmax(0, 1fr); }
  .simulation-card .sim-stage { aspect-ratio: 2.1; }
  .practice-page .course-heading { align-items: start; flex-direction: column; gap: 10px; }
}
@media (max-width: 900px) {
  .course-catalogue, .class-work-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 610px) {
  .course-catalogue, .class-work-grid, .teacher-grid, .labs-page .labs-index-grid { grid-template-columns: minmax(0, 1fr); }
  .practice-page .course-banner { grid-template-columns: minmax(0, 1fr); }
  .course-banner-media :is(canvas, .course-formula-plate) { max-height: 166px; object-fit: contain; background: var(--tone); }
  .practice-page .course-tab { flex: 0 0 auto; }
  .practice-page .course-tabs { gap: 0 13px; }
  .bright-teacher-context { gap: 6px; flex-wrap: wrap; }
  .teacher-context-links a { padding-inline: 8px; font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  :is(.course-cover, .class-work-card, .teacher-card, .lab-index-card, .simulation-card, .course-banner > div),
  .practice-page .course-tab[aria-current="page"]::after { animation: none; }
  :is(.course-cover, .lab-index-card, .join-class-link, .course-cover-art img, .course-cover-action .m3-icon, .lab-card-action .m3-icon) {
    transition: none;
    transform: none;
  }
}