.course-eyebrow {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.course-progress {
  max-width: 900px;
  margin: 0 0 35px;
  padding: 19px 22px;
  background: var(--cream);
  border: 1px solid var(--line);
}

.course-progress label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

.course-progress progress {
  display: block;
  width: 100%;
  height: 14px;
  appearance: none;
  -webkit-appearance: none;
  overflow: hidden;
  background: #eee9dc;
  border: 0;
  border-radius: 999px;
  accent-color: var(--orange);
}

.course-progress progress::-webkit-progress-bar {
  background: #eee9dc;
  border-radius: 999px;
}

.course-progress progress::-webkit-progress-value {
  background: var(--orange);
  border-radius: 999px;
  transition: width 220ms ease;
}

.course-progress progress::-moz-progress-bar {
  background: var(--orange);
  border-radius: 999px;
  transition: width 220ms ease;
}

.course-progress p,
.task-progress {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.course-calculator {
  max-width: 900px;
  margin-top: 44px;
  padding: 24px;
  background: var(--cream);
  border: 1px solid var(--line);
}

.course-calculator h2 {
  margin-top: 0;
}

.course-calculator h3 {
  margin: 38px 0 14px;
  font-size: 1.35rem;
}

.calculator-form + .calculator-form,
.calculator-form + h3 {
  margin-top: 36px;
}

.calculator-form fieldset,
.calculator-input-details {
  min-width: 0;
  margin: 18px 0;
  padding: 18px;
  background: var(--white);
  border: 1px solid var(--line);
}

.calculator-form legend,
.calculator-input-details summary {
  padding: 0 6px;
  font-weight: 800;
}

.calculator-input-details summary {
  cursor: pointer;
}

.calculator-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 10px;
}

.calculator-field {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 700;
}

.calculator-field input,
.calculator-field select {
  width: 100%;
  min-height: 44px;
  padding: 9px 11px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid #9e9a8f;
  border-radius: 2px;
  font: inherit;
  font-weight: 400;
}

.calculator-field input:focus-visible,
.calculator-field select:focus-visible {
  outline: 3px solid var(--sun);
  outline-offset: 2px;
}

.calculator-unit {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 400;
}

.calculator-formula {
  padding: 12px 14px;
  background: var(--soft);
}

.calculator-result {
  margin-top: 18px;
  padding: 15px 17px;
  background: var(--white);
  border-left: 4px solid var(--orange);
}

.calculator-result:empty {
  display: none;
}

.calculator-result [data-result-status="error"],
.calculator-result [data-result-status="incomplete"],
.calculator-result [data-result-status="partial"] {
  color: #684900;
}

.calculator-result table {
  margin-top: 14px;
}

.calculator-final-note {
  margin: 22px 0 0;
  padding: 14px 16px;
  background: var(--soft);
  font-weight: 700;
}

.calculator-checkbox {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
}

.calculator-checkbox input {
  width: 20px;
  min-height: 20px;
}

.calculator-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.calculator-file {
  max-width: 560px;
  margin-top: 20px;
}

@media (max-width: 640px) {
  .course-calculator {
    padding: 18px 15px;
  }

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

.course-intro {
  max-width: 900px;
  margin-bottom: 35px;
}

.course-intro .button {
  margin-top: 8px;
}

.course-section-heading {
  margin: 48px 0 22px;
}

.course-section-heading h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.lesson-card {
  position: relative;
  min-height: 150px;
  align-items: flex-start;
  flex-direction: column;
  justify-content: flex-start;
  gap: 8px;
  padding: 22px 54px 22px 22px;
}

.lesson-card-number {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.lesson-card h3 {
  margin: 0;
  font-size: 1.35rem;
}

.lesson-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.lesson-card > span:last-child {
  position: absolute;
  top: 22px;
  right: 22px;
}

.lesson-objective {
  max-width: 820px;
  padding: 15px 18px;
  background: var(--cream);
  border-left: 4px solid var(--sun);
}

.lesson-content-copy {
  max-width: 900px;
}

.lesson-content-copy h2,
.lesson-checklist h2,
.lesson-quiz h2,
.assistant-panel h2,
.threshold-section h2,
.lesson-sources h2,
.course-related h2 {
  margin: 1.9em 0 0.65em;
  font-size: clamp(1.75rem, 3vw, 2.4rem);
}

.lesson-checklist,
.lesson-quiz,
.assistant-panel,
.threshold-section,
.lesson-sources,
.lesson-final-action {
  max-width: 900px;
  margin-top: 44px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.lesson-checklist > p,
.lesson-quiz > p,
.threshold-section > p,
.assistant-panel > p {
  color: var(--muted);
}

.lesson-checklist ul {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.lesson-checklist li + li {
  margin-top: 10px;
}

.course-task {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  padding: 13px 15px;
  background: var(--soft);
  border: 1px solid var(--line);
  cursor: pointer;
}

.course-task input {
  width: 20px;
  height: 20px;
  flex: 0 0 20px;
  margin: 2px 0 0;
  accent-color: var(--orange);
}

.course-task:has(input:checked) span {
  color: var(--muted);
  text-decoration: line-through;
}

.quiz-item {
  padding: 17px 0;
  border-top: 1px solid var(--line);
}

.quiz-question {
  margin: 0 0 9px;
  color: var(--ink);
  font-weight: 700;
}

.quiz-item details summary {
  display: inline-flex;
  padding: 8px 0;
  color: #725100;
  cursor: pointer;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

.quiz-item details p {
  margin: 7px 0 0;
  padding: 13px 16px;
  color: #38362f;
  background: var(--soft);
}

.assistant-panel {
  padding: 23px;
  background: var(--cream);
  border: 1px solid var(--line);
}

.assistant-panel h2 {
  margin-top: 0;
}

.assistant-step {
  margin-top: 20px;
  padding: 18px;
  background: var(--white);
  border: 1px solid var(--line);
}

.assistant-step h3 {
  margin: 0 0 15px;
  font-size: 1.2rem;
}

.assistant-options {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  border: 0;
}

.assistant-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 11px 13px;
  border: 1px solid var(--line);
  cursor: pointer;
}

.assistant-option:has(input:checked) {
  border-color: var(--orange);
  background: var(--cream);
}

.assistant-option input {
  margin: 5px 0 0;
  accent-color: var(--orange);
}

.assistant-step button,
.assistant-reset,
.assistant-edit {
  margin-top: 14px;
  cursor: pointer;
}

.assistant-history {
  display: grid;
  gap: 9px;
  margin-top: 16px;
}

.assistant-history-item {
  padding: 12px 14px;
  background: var(--white);
  border: 1px solid var(--line);
}

.assistant-history-item p {
  margin: 0;
}

.assistant-history-item .assistant-edit {
  margin-top: 7px;
  padding: 0;
  border: 0;
  background: none;
  color: #725100;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

.assistant-result {
  margin-top: 18px;
  padding: 18px;
  background: var(--white);
  border-left: 4px solid var(--orange);
}

.assistant-result h3 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.assistant-result p:last-child {
  margin-bottom: 0;
}

.assistant-reset {
  padding: 8px 12px;
  border: 1px solid var(--ink);
  background: transparent;
  font-weight: 700;
}

.threshold-section .table-wrap {
  margin-top: 18px;
}

.threshold-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.threshold-table th,
.threshold-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.threshold-table thead th {
  color: var(--muted);
  background: var(--soft);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.threshold-table tbody th {
  width: 40%;
  font-size: 0.95rem;
}

.threshold-table tbody td {
  color: var(--muted);
}

.lesson-final-action {
  padding: 18px 20px;
  background: var(--cream);
  border-top: 0;
  border-left: 4px solid var(--sun);
}

.lesson-final-action p {
  margin: 0;
  font-weight: 700;
}

.lesson-completion {
  margin: 32px 0 0;
}

.lesson-complete {
  cursor: pointer;
}

.course-related {
  max-width: 900px;
  margin-top: 45px;
}

.course-related h2 {
  margin-top: 0;
}

.course-action-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.course-action-links .button {
  min-height: 42px;
  padding: 9px 13px;
}

.lesson-navigation {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  max-width: 900px;
  margin-top: 45px;
  padding-top: 23px;
  border-top: 1px solid var(--line);
}

.noscript-note {
  padding: 12px 14px;
  background: var(--soft);
}

.lesson-illustrations,
.lesson-animation,
.lesson-media,
.lesson-transcript {
  max-width: 900px;
  margin-top: 44px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.lesson-illustrations h2,
.lesson-animation h2,
.lesson-media h2,
.lesson-transcript h2 {
  margin: 0 0 16px;
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.lesson-illustration-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.lesson-illustration {
  min-width: 0;
  margin: 0;
  padding: 16px;
  background: var(--cream);
  border: 1px solid var(--line);
}

.lesson-illustration img {
  display: block;
  width: 100%;
  height: auto;
}

.lesson-illustration figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.lesson-animation {
  padding: 22px;
  background: var(--cream);
  border: 1px solid var(--line);
}

.lesson-animation h2 {
  margin-top: 0;
}

.animation-control {
  margin: 8px 0 18px;
  cursor: pointer;
}

.animation-sequence {
  display: grid;
  gap: 16px;
}

.animation-inventory,
.animation-route,
.animation-pending,
.animation-tasks {
  margin: 0;
  padding: 16px 18px;
  background: var(--white);
  border: 1px solid var(--line);
}

.animation-inventory h3,
.animation-route h3,
.animation-tasks h3 {
  margin: 0 0 9px;
  font-size: 1.08rem;
}

.animation-inventory ul,
.animation-route ol,
.animation-tasks ul {
  margin: 0;
  padding-left: 22px;
}

.animation-routes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.animation-route li + li,
.animation-inventory li + li,
.animation-tasks li + li {
  margin-top: 6px;
}

.animation-pending {
  border-left: 4px solid var(--orange);
}

.animation-pending strong {
  font-size: 1.1rem;
}

.animation-tasks p {
  margin: 12px 0 0;
  font-weight: 800;
}

.animation-static-note {
  display: none;
  margin-bottom: 0;
  padding: 12px 14px;
  background: var(--soft);
  font-weight: 700;
}

.lesson-animation[data-animation-state="playing"] [data-animation-step="inventory"],
.lesson-animation[data-animation-state="paused"] [data-animation-step="inventory"] {
  animation: lesson-inventory-in 12s ease both;
}

.lesson-animation[data-animation-state="playing"] [data-animation-step="routes"],
.lesson-animation[data-animation-state="paused"] [data-animation-step="routes"] {
  animation: lesson-routes-in 12s ease both;
}

.lesson-animation[data-animation-state="playing"] [data-animation-step="pending"],
.lesson-animation[data-animation-state="paused"] [data-animation-step="pending"] {
  animation: lesson-pending-in 12s ease both;
}

.lesson-animation[data-animation-state="playing"] [data-animation-step="tasks"],
.lesson-animation[data-animation-state="paused"] [data-animation-step="tasks"] {
  animation: lesson-tasks-in 12s ease both;
}

.lesson-animation[data-animation-state="paused"] [data-animation-step] {
  animation-play-state: paused;
}

@keyframes lesson-inventory-in {
  0% { opacity: 0.35; transform: translateY(6px); }
  25% { opacity: 1; transform: none; }
  100% { opacity: 1; transform: none; }
}

@keyframes lesson-routes-in {
  0%, 24.9% { opacity: 0; visibility: hidden; transform: translateY(8px); }
  25%, 100% { opacity: 1; visibility: visible; transform: none; }
}

@keyframes lesson-pending-in {
  0%, 49.9% { opacity: 0; visibility: hidden; transform: translateY(8px); }
  50%, 100% { opacity: 1; visibility: visible; transform: none; }
}

@keyframes lesson-tasks-in {
  0%, 74.9% { opacity: 0; visibility: hidden; transform: translateY(8px); }
  75%, 100% { opacity: 1; visibility: visible; transform: none; }
}

.lesson-media {
  display: grid;
  gap: 24px;
}

.lesson-media-block {
  min-width: 0;
}

.lesson-media-block h2 {
  margin-top: 0;
}

.lesson-video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #171717;
}

.lesson-video-poster,
.lesson-video-poster img,
.lesson-video-player {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.lesson-video-poster img,
.lesson-video-player {
  object-fit: contain;
}

.media-load-link {
  z-index: 1;
}

.lesson-video-frame .media-load-link {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.lesson-video-frame [hidden],
.lesson-audio-block [hidden] {
  display: none !important;
}

.lesson-audio-block audio {
  display: block;
  width: 100%;
  margin-top: 16px;
}

.media-status:empty {
  display: none;
}

.media-status:not(:empty) {
  padding: 10px 12px;
  background: var(--soft);
}

.lesson-transcript p {
  max-width: 78ch;
}

@media (prefers-reduced-motion: reduce) {
  .animation-control {
    display: none !important;
  }

  .animation-static-note {
    display: block;
  }

  .lesson-animation [data-animation-step] {
    opacity: 1 !important;
    visibility: visible !important;
    animation: none !important;
    transform: none !important;
  }
}

@media (max-width: 760px) {
  .course-progress {
    padding: 16px;
  }

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

  .lesson-card {
    min-height: 0;
  }

  .assistant-panel {
    padding: 17px;
  }

  .lesson-navigation {
    flex-direction: column;
  }

  .lesson-navigation .button {
    width: 100%;
  }

  .course-action-links {
    align-items: stretch;
    flex-direction: column;
  }

  .course-action-links .button {
    width: 100%;
  }

  .lesson-animation {
    padding: 17px;
  }

  .lesson-illustration-grid,
  .animation-routes {
    grid-template-columns: minmax(0, 1fr);
  }

  .lesson-video-frame .media-load-link {
    width: calc(100% - 32px);
    max-width: 260px;
  }

  .threshold-table,
  .threshold-table tbody,
  .threshold-table tr,
  .threshold-table th,
  .threshold-table td {
    display: block;
    width: 100%;
  }

  .threshold-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .threshold-table tr {
    margin-bottom: 12px;
    padding: 12px 15px;
    background: var(--soft);
    border: 1px solid var(--line);
  }

  .threshold-table th,
  .threshold-table td {
    padding: 5px 0;
    border: 0;
  }
}