.ai-assessment-region {
  margin-top: 18px;
}

.ai-assessment-region.loading,
.ai-assessment-region.error {
  border-left: 3px solid var(--blue);
  padding: 8px 12px;
  color: var(--muted);
}

.ai-assessment-region.error {
  border-left-color: #b42318;
  color: #b42318;
}

.review-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  border-left: 4px solid var(--orange);
  padding: 12px 14px;
  background: #fff8ed;
}

.review-banner span {
  color: var(--muted);
  font-size: 12px;
}

.assessment-history > header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.assessment-history > header h3,
.assessment-history > header p {
  margin: 0;
}

.assessment-history > header p {
  max-width: 680px;
  margin-top: 5px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.assessment-history-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.assessment-history-list li {
  display: grid;
  grid-template-columns: 4px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--line);
  padding: 12px 0;
}

.history-mark {
  width: 4px;
  height: 38px;
  border-radius: 2px;
  background: var(--orange);
}

.history-mark.status-learning { background: var(--blue); }
.history-mark.status-mastered { background: var(--green); }

.history-result time,
.history-result strong,
.history-meta strong,
.history-meta small {
  display: block;
}

.history-result time,
.history-meta small {
  color: var(--muted);
  font-size: 12px;
}

.history-result strong { margin-top: 3px; }

.history-meta {
  min-width: 150px;
  text-align: right;
}

.history-meta small { margin-top: 3px; }

.submission-message {
  min-height: 22px;
  margin-top: 12px;
  color: var(--muted);
}

.submission-message.error {
  color: #b42318;
}

.evidence-artifacts > p {
  margin: -4px 0 14px;
  color: var(--muted);
  line-height: 1.5;
}

.assessment-item-loading {
  min-height: 64px;
  margin-top: 18px;
  border-left: 3px solid var(--blue);
  padding: 20px 16px;
  background: #f4f8fb;
  color: var(--ink-soft);
  font-weight: 700;
}

.assessment-item-source {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.assessment-choice-group {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  border: 0;
  padding: 0;
}

.assessment-choice-group legend,
.assessment-fill-label > span {
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 800;
}

.assessment-choice-group label {
  position: relative;
  display: block;
}

.assessment-choice-group input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.assessment-choice-group span {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  min-height: 54px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 8px 14px;
  background: #ffffff;
  color: var(--ink);
  cursor: pointer;
  font-size: 16px;
  line-height: 1.4;
}

.assessment-choice-group b {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  font-size: 13px;
}

.assessment-choice-group input:checked + span {
  border-color: var(--accent);
  background: rgba(14, 118, 109, 0.07);
}

.assessment-choice-group input:checked + span b {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.assessment-choice-group input:focus-visible + span {
  outline: 2px solid rgba(14, 118, 109, 0.35);
  outline-offset: 2px;
}

.assessment-fill-label {
  display: grid;
  max-width: 420px;
  margin-top: 18px;
}

.assessment-fill-label input {
  min-height: 54px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 10px 14px;
  color: var(--ink);
  font: inherit;
  font-size: 20px;
}

.drawing-board {
  margin-top: 18px;
}

.drawing-board canvas {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: #ffffff;
  box-shadow: inset 0 0 0 1px rgba(23, 35, 33, 0.02);
  cursor: crosshair;
  touch-action: none;
}

.drawing-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
}

.drawing-toolbar > div {
  display: flex;
  gap: 8px;
}

.drawing-board [data-drawing-status] {
  min-height: 20px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 560px) {
  .drawing-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .drawing-toolbar > div,
  .drawing-toolbar button {
    flex: 1;
  }
}

.artifact-upload {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 0 13px;
  background: #ffffff;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}

.artifact-upload input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

.artifact-message {
  min-height: 20px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

.artifact-message.error {
  color: #b42318;
}

.artifact-list {
  display: grid;
  gap: 10px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.artifact-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.artifact-preview img {
  display: block;
  width: 96px;
  height: 64px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 4px;
}

.artifact-preview audio {
  width: 96px;
  height: 36px;
}

.artifact-meta {
  min-width: 0;
}

.artifact-meta strong,
.artifact-meta small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.artifact-meta small {
  margin-top: 3px;
  color: var(--muted);
}

@media (max-width: 560px) {
  .artifact-item {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .artifact-item > button {
    grid-column: 2;
    justify-self: start;
  }

  .artifact-preview img,
  .artifact-preview audio {
    width: 72px;
  }

  .assessment-history > header {
    align-items: flex-start;
    flex-direction: column;
  }

  .assessment-history-list li {
    grid-template-columns: 4px minmax(0, 1fr);
  }

  .history-meta {
    grid-column: 2;
    text-align: left;
  }
}

.ai-assessment-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #ffffff;
}

.ai-assessment-heading,
.ai-metrics {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.ai-assessment-heading .eyebrow {
  margin-bottom: 6px;
}

.ai-metrics span {
  min-width: 72px;
  border-left: 1px solid var(--line);
  padding-left: 12px;
}

.ai-metrics small,
.ai-metrics strong {
  display: block;
}

.ai-metrics small {
  color: var(--muted);
}

.ai-metrics strong {
  margin-top: 2px;
  font-size: 20px;
}

.ai-evidence-list {
  display: grid;
  gap: 8px;
  margin: 18px 0;
}

.ai-evidence-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 10px;
  border-left: 3px solid var(--orange);
  padding: 10px 12px;
  background: var(--bg);
}

.ai-evidence-item.met {
  border-left-color: var(--green);
}

.ai-evidence-item p,
.ai-evidence-item blockquote {
  grid-column: 2;
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.ai-evidence-item blockquote {
  font-style: italic;
}

.ai-feedback h4 {
  margin: 15px 0 6px;
}

.ai-feedback p,
.ai-feedback ul {
  margin-top: 0;
  line-height: 1.55;
}

.lesson-session-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line-strong);
}

.lesson-session-heading h3 {
  margin: 10px 0 6px;
  font-size: 24px;
}

.lesson-session-heading p {
  max-width: 760px;
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.55;
}

.lesson-overview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 0.35fr);
  gap: 28px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.lesson-overview strong {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
}

.lesson-overview ul,
.lesson-overview .empty {
  margin: 0;
}

.lesson-completion progress {
  width: 100%;
  height: 8px;
  accent-color: var(--accent);
}

.lesson-step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--line-strong);
}

.lesson-step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 16px;
  min-height: 142px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.lesson-step.completed {
  background: linear-gradient(90deg, var(--surface-subtle), transparent 72%);
}

.lesson-step-number {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.lesson-step.completed .lesson-step-number {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.lesson-step-content {
  min-width: 0;
}

.lesson-step-content > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.lesson-step-content h4,
.lesson-step-content p,
.lesson-step-content blockquote {
  margin: 0;
}

.lesson-step-content h4 {
  font-size: 18px;
}

.lesson-step-content > div span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.lesson-step-content p {
  margin-top: 8px;
  color: var(--ink-soft);
  line-height: 1.55;
}

.lesson-step-content blockquote {
  margin-top: 10px;
  border-left: 3px solid var(--accent);
  padding: 8px 10px;
  color: var(--muted);
  background: var(--surface-subtle);
  line-height: 1.45;
}

.lesson-step-check {
  align-self: start;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-width: 108px;
  color: var(--muted);
  font-size: 12px;
  text-transform: none;
}

.lesson-step-check input {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
}

.lesson-step-response {
  grid-column: 2 / -1;
  display: grid;
  gap: 10px;
  max-width: 760px;
  margin-top: -2px;
}

.lesson-step-response > label,
.lesson-step-response.read-only {
  display: grid;
  gap: 7px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 700;
}

.lesson-step-response textarea {
  width: 100%;
  min-height: 96px;
  resize: vertical;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 11px 12px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 400;
  line-height: 1.5;
}

.lesson-step-response textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 28%, transparent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.lesson-response-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lesson-response-actions button {
  min-height: 38px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 0 14px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 750;
}

.lesson-response-actions output {
  color: var(--muted);
  font-size: 13px;
}

.lesson-step-feedback {
  border-left: 3px solid #b78914;
  padding: 10px 12px;
  background: var(--surface-subtle);
}

.lesson-step-feedback.ready {
  border-left-color: #16805c;
}

.lesson-step-feedback strong,
.lesson-step-feedback p {
  margin: 0;
}

.lesson-feedback-language-note {
  margin: 0;
  border-left: 3px solid var(--blue);
  padding: 9px 11px;
  background: var(--surface-subtle);
  color: var(--muted);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.45;
}

.lesson-step-feedback p {
  margin-top: 5px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.5;
}

.lesson-step-response.read-only > p {
  margin: 0;
  white-space: pre-wrap;
  font-weight: 400;
  line-height: 1.5;
}

.ai-lesson-region {
  margin-top: 18px;
}

.ai-lesson-region.loading,
.ai-lesson-region.error {
  border-left: 3px solid var(--blue);
  padding: 8px 12px;
  color: var(--muted);
}

.ai-lesson-region.error {
  border-left-color: #b42318;
  color: #b42318;
}

.ai-lesson-region.fallback {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-left: 3px solid #b78914;
  padding: 8px 12px;
  color: var(--muted);
}

.session-surface {
  min-height: calc(100dvh - 132px);
  background: var(--bg);
}

.session-shell {
  width: min(100% - 32px, 980px);
  margin: 0 auto;
  padding: 28px 0 56px;
}

.session-heading {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line-strong);
}

.session-back {
  align-self: start;
  justify-self: start;
}

.session-context .eyebrow {
  margin-bottom: 10px;
  color: var(--accent);
}

.session-context h2 {
  margin: 14px 0 8px;
  font-size: clamp(26px, 4vw, 40px);
  letter-spacing: 0;
}

.session-context > p {
  max-width: 760px;
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.6;
}

.session-task {
  padding-top: 26px;
}

@media (max-width: 700px) {
  .session-shell {
    width: min(100% - 24px, 980px);
    padding-top: 18px;
  }

  .session-heading {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}

.graph-view {
  position: relative;
  height: calc(100dvh - 77px);
  min-height: 560px;
  overflow: hidden;
  background: #0c1115;
  color: #f7fafb;
}

#graphCanvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
}

.graph-toolbar,
.graph-selection {
  position: absolute;
  z-index: 2;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(12, 17, 21, 0.9);
  backdrop-filter: blur(12px);
}

.graph-toolbar {
  top: 18px;
  left: 18px;
  right: 18px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 16px;
}

.graph-toolbar .eyebrow {
  color: #8fcfc8;
}

.graph-toolbar p:last-child {
  margin: 0;
  color: #a9b5bd;
  font-size: 13px;
}

.graph-toolbar button,
.graph-selection button {
  border-color: rgba(255, 255, 255, 0.25);
  background: #172027;
  color: #ffffff;
}

.graph-selection {
  left: 18px;
  right: 18px;
  bottom: 18px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 22px;
  min-height: 86px;
  padding: 16px;
}

.graph-selection-copy {
  min-width: 0;
}

.graph-selection h2 {
  margin: 8px 0 4px;
  font-size: 22px;
}

.graph-selection p {
  max-width: 820px;
  margin: 0;
  color: #b8c1c7;
  line-height: 1.45;
}

.graph-lineage-count {
  display: inline-block;
  margin-top: 8px;
  color: #ffbf47;
  font-size: 13px;
  font-weight: 700;
}

@media (max-width: 880px) {
  .graph-view {
    height: calc(100dvh - 152px);
    min-height: 520px;
  }
}

@media (max-width: 520px) {
  .ai-assessment-heading,
  .graph-toolbar,
  .graph-selection {
    align-items: stretch;
    flex-direction: column;
  }

  .ai-metrics {
    justify-content: flex-start;
  }

  .lesson-session-heading,
  .lesson-step-content > div {
    align-items: stretch;
    flex-direction: column;
  }

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

  .lesson-step {
    grid-template-columns: 30px minmax(0, 1fr);
  }

  .lesson-step-check {
    grid-column: 2;
    grid-row: 2;
  }

  .graph-view {
    height: calc(100dvh - 244px);
    min-height: 500px;
  }

  .graph-toolbar,
  .graph-selection {
    left: 10px;
    right: 10px;
  }

  .graph-toolbar {
    top: 10px;
  }

  .graph-selection {
    bottom: 10px;
  }

  .graph-selection p {
    display: -webkit-box;
    overflow: hidden;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
  }
}