:root {
  --color-bg: #fbfbf8;
  --color-text: #22252a;
  --color-muted: #62686d;
  --color-soft: #7d8388;
  --color-line: #dfe3df;
  --color-accent: #356f66;
  --color-accent-dark: #285850;
  --color-accent-soft: #eef5f3;
  --color-field: #ffffff;
  --font-main: Pretendard, "Noto Sans KR", "Malgun Gothic", sans-serif;
}

.day04-lesson {
  max-width: 900px;
  margin: 0 auto;
}

.day04-progress {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin: 0 0 1.5rem;
  color: var(--muted-text, #667085);
  font-size: 0.9rem;
}

.day04-progress span.is-current {
  color: var(--accent, #246bce);
  font-weight: 700;
}

.day04-section,
.day04-record,
.day04-final,
.day04-complete {
  scroll-margin-top: 5rem;
}

.day04-section h3,
.day04-record h3,
.day04-final h3 {
  margin-top: 2rem;
}

.day04-image {
  display: block;
  width: min(100%, 760px);
  height: auto;
  margin: 1.2rem auto;
  border-radius: 0.75rem;
}

.day04-record-form {
  margin-top: 1.25rem;
}

.day04-record-form textarea {
  min-height: 6rem;
  width: 100%;
  resize: vertical;
}

.day04-section blockquote {
  margin: 1.25rem 0;
}

@media (max-width: 720px) {
  .day04-progress {
    font-size: 0.82rem;
  }

  .day04-progress > span[aria-hidden="true"] {
    display: none;
  }

  .day04-image {
    border-radius: 0.5rem;
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-main);
  font-size: 17px;
  line-height: 1.72;
}

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

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

a:hover,
a:focus-visible {
  color: var(--color-accent-dark);
}

button:focus-visible,
a:focus-visible,
summary:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
.checkbox-option:focus-within,
.problem-meaning-option:focus-within {
  outline: 3px solid rgba(53, 111, 102, 0.28);
  outline-offset: 3px;
}

.page {
  width: min(100% - 48px, 960px);
  margin: 0 auto;
  padding: 38px 0 72px;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 48px;
  color: var(--color-muted);
}

.project-name,
.header-current,
.student-name,
.save-state,
.current-location,
.project-intro p,
.phase-notice p,
.special-notice p {
  margin: 0;
}

.project-name {
  color: var(--color-text);
  font-size: 17px;
  font-weight: 600;
}

.header-current {
  margin-top: 2px;
  font-size: 15px;
}

.app-header__meta {
  text-align: right;
}

.student-name {
  font-size: 15px;
  white-space: nowrap;
}

.student-control {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
}

.change-student-button {
  min-height: 34px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  padding: 4px 10px;
  background: var(--color-field);
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.change-student-button:hover,
.change-student-button:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
}

.save-state {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 2px;
  color: var(--color-muted);
  font-size: 14px;
}

.save-state[data-save-tone="failed"] {
  color: #8a3c2f;
}

.save-state--floating {
  position: fixed;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 30;
  max-width: min(282px, calc(100vw - 36px));
  min-height: 38px;
  margin: 0;
  border: 1px solid rgba(53, 111, 102, 0.18);
  border-radius: 8px;
  padding: 7px 11px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 8px 22px rgba(34, 37, 42, 0.1);
  justify-content: flex-start;
  flex-wrap: wrap;
  line-height: 1.4;
  text-align: left;
}


.save-state--floating[data-save-tone="saved"] {
  opacity: 0.78;
  transform: scale(0.98);
  transform-origin: right bottom;
}

.save-state--floating[data-save-tone="failed"] {
  border-color: rgba(138, 60, 47, 0.36);
  background: #fff8f6;
  opacity: 1;
}

.retry-save-button {
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--color-accent);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.retry-save-button:hover,
.retry-save-button:focus-visible {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

.identity-gate {
  max-width: 780px;
  margin: 14px auto 0;
}

.identity-gate__content {
  border-top: 3px solid var(--color-accent);
  padding-top: 28px;
}

.identity-gate__heading {
  margin-bottom: 20px;
}

.identity-gate__heading h1 {
  margin: 4px 0 0;
  font-size: 30px;
  line-height: 1.35;
}

.identity-gate__intro {
  margin: 0 0 28px;
  border-left: 4px solid var(--color-line);
  padding-left: 18px;
  color: var(--color-muted);
}

.identity-gate__intro p {
  margin: 0;
}

.identity-gate__selector {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(142px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.student-card {
  min-height: 88px;
  border: 2px solid var(--color-line);
  border-radius: 8px;
  padding: 14px;
  background: var(--color-field);
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
}

.student-card:hover,
.student-card:focus-visible {
  border-color: var(--color-accent);
}

.student-card.is-selected {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.student-card__name,
.student-card__status {
  display: block;
}

.student-card__name {
  font-size: 20px;
  font-weight: 800;
}

.student-card__status {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 700;
}

.student-card.is-selected .student-card__status {
  color: var(--color-accent-dark);
}

.identity-gate__confirmation {
  margin: 0 0 14px;
  color: var(--color-accent-dark);
  font-weight: 800;
}

.identity-gate__message {
  margin: 0 0 14px;
  color: #8a3c2f;
  font-weight: 700;
}

.identity-gate__message--notice {
  color: var(--color-muted);
}

.identity-gate__enter {
  border: 0;
}

.page-heading {
  max-width: 760px;
  margin-bottom: 28px;
}

.page-heading h1 {
  margin: 0 0 6px;
  font-size: 25px;
  font-weight: 700;
  line-height: 1.38;
}

.current-location {
  color: var(--color-accent);
  font-size: 17px;
  font-weight: 600;
}

.project-intro,
.phase-notice,
.special-notice {
  max-width: 760px;
  margin: 0 0 28px;
  color: var(--color-text);
  font-size: 18px;
}

.project-intro p + p,
.phase-notice p + p,
.special-notice p + p {
  margin-top: 4px;
}

.research-map,
.standard-day,
.lesson-section {
  max-width: 760px;
}

.phase-group {
  margin-top: 34px;
}

.phase-group:first-child {
  margin-top: 0;
}

.phase-group__title {
  margin: 0 0 12px;
  color: var(--color-text);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
}

.phase-group__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.research-map__focus-list {
  gap: 6px;
}

.research-day {
  min-height: 44px;
  padding: 9px 12px;
  border-radius: 8px;
}

.research-day__line {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
}

.research-day__link {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.research-day__link:hover .research-day__title,
.research-day__link:focus-visible .research-day__title {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.research-day__number {
  color: var(--color-muted);
  font-size: 16px;
  font-variant-numeric: tabular-nums;
}

.research-day__title {
  min-width: 0;
  font-size: 17px;
  font-weight: 500;
  overflow-wrap: anywhere;
}

.research-day__status {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}

.research-day--completed {
  color: var(--color-muted);
}

.research-day--completed .research-day__status,
.research-day--current .research-day__number,
.research-day--current .research-day__status {
  color: var(--color-accent);
}

.research-day--current {
  background: var(--color-accent-soft);
  color: var(--color-text);
}

.research-day--current .research-day__title {
  font-size: 21px;
  font-weight: 650;
}

.research-day--future {
  color: var(--color-muted);
}

.research-day--future .research-day__number {
  color: var(--color-muted);
}

.research-day__body {
  margin: 12px 0 4px 54px;
}

.research-day__description {
  margin: 0;
  color: var(--color-text);
  font-size: 18px;
  line-height: 1.72;
}

.research-day__connection {
  margin-top: 16px;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.66;
}

.research-day__connection p {
  margin: 0;
}

.research-day__connection p + p {
  margin-top: 6px;
}

.research-day__connection-label {
  display: block;
  color: var(--color-text);
  font-weight: 600;
}

.research-day__actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 18px;
}

.start-button,
.primary-link {
  min-height: 48px;
  border-radius: 8px;
  background: var(--color-accent);
  color: #ffffff;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
}

.start-button {
  border: 0;
  padding: 10px 22px;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  padding: 10px 20px;
  text-decoration: none;
}

.start-button:hover,
.start-button:focus-visible,
.primary-link:hover,
.primary-link:focus-visible {
  background: var(--color-accent-dark);
  color: #ffffff;
}

.primary-link:disabled {
  background: #aeb8b4;
  cursor: not-allowed;
}

.full-map {
  margin-top: 34px;
}

.full-map summary {
  width: fit-content;
  color: var(--color-accent);
  font-weight: 600;
  cursor: pointer;
}

.full-map__body {
  margin-top: 22px;
}

.standard-day {
  margin-top: 78px;
}

.lesson-section {
  scroll-margin-top: 28px;
  margin-top: 96px;
  padding-top: 10px;
}

.section-kicker,
.research-context,
.step-label,
.quiz-question__number {
  margin: 0 0 8px;
  color: var(--color-accent);
  font-size: 16px;
  font-weight: 700;
}

.section-title {
  margin: 0;
  color: var(--color-text);
  font-size: 34px;
  font-weight: 750;
  line-height: 1.32;
  letter-spacing: 0;
}

.section-description,
.next-connection {
  margin: 20px 0 0;
  color: var(--color-muted);
  font-size: 18px;
  line-height: 1.72;
}

.section-description p {
  margin: 0;
}

.section-description p + p {
  margin-top: 4px;
}

.story-step {
  margin-top: 34px;
}

.question-text {
  margin: 0;
  color: var(--color-text);
  font-size: 22px;
  font-weight: 650;
  line-height: 1.55;
}

.choice-list {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.choice-button {
  width: 100%;
  min-height: 46px;
  padding: 10px 14px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: transparent;
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
  overflow-wrap: anywhere;
}

.choice-button:hover,
.choice-button.is-selected {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.choice-button.is-selected {
  color: var(--color-accent-dark);
  font-weight: 600;
}

.inline-feedback {
  margin: 10px 0 0;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.65;
  white-space: pre-line;
}

.inline-feedback--correct {
  color: var(--color-accent-dark);
}

.carried-result {
  margin: 0;
  color: var(--color-text);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.58;
}

.reusable-idea {
  margin: 16px 0 0;
  color: var(--color-text);
  font-size: 20px;
  font-weight: 650;
}

.reusable-idea span {
  display: block;
  color: var(--color-muted);
  font-size: 15px;
  font-weight: 600;
}

.section-action {
  display: flex;
  justify-content: flex-end;
  margin-top: 30px;
}

.core-statement {
  margin: 30px 0 0;
  color: var(--color-text);
  font-size: 30px;
  font-weight: 750;
  line-height: 1.45;
}

.big-question {
  margin: 28px 0 0;
  color: var(--color-text);
  font-size: 24px;
  font-weight: 650;
  line-height: 1.55;
}

.plain-group {
  margin-top: 34px;
}

.day01-activity {
  border-top: 1px solid var(--color-line);
  padding-top: 20px;
}

.day01-activity:first-child {
  border-top: 0;
  padding-top: 0;
}

.activity-section {
  margin-top: 18px;
}

.activity-step {
  margin-top: 16px;
}

.activity-step + .activity-step {
  margin-top: 20px;
}

.activity-label {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  max-width: 100%;
  margin: 0 0 8px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.35;
}

.activity-guide {
  margin: 0;
  color: var(--color-text);
  font-size: 17px;
  line-height: 1.58;
}

.activity-result {
  margin-top: 14px;
  padding: 13px 15px;
  border-left: 3px solid var(--color-accent);
  border-radius: 0 8px 8px 0;
  background: var(--color-accent-soft);
}

.activity-result .activity-label {
  background: #ffffff;
}

.activity-success,
.day01-activity .inline-feedback--correct {
  font-weight: 700;
}

.plain-group h3,
.plain-group h4,
.judgement-check h3 {
  margin: 0 0 10px;
  color: var(--color-text);
  font-size: 18px;
  font-weight: 700;
}

.plain-group p {
  margin: 0;
  font-size: 19px;
  line-height: 1.7;
}

.plain-group p + p {
  margin-top: 6px;
}

.plain-group .activity-label,
.shake-led-choice legend .activity-label,
.free-lab-grid legend .activity-label {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin: 0 0 8px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.35;
}

.plain-group .activity-guide {
  margin: 0;
  color: var(--color-text);
  font-size: 17px;
  line-height: 1.58;
}

.research-summary-list,
.task-list,
.help-list {
  margin: 0;
  padding-left: 1.35em;
}

.research-summary-list {
  list-style: none;
  padding-left: 0;
}

.research-summary-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  margin-top: 6px;
  font-size: 19px;
}

.research-summary-list span {
  color: var(--color-accent);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.research-summary-list strong {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.research-summary-list li.is-complete strong {
  color: var(--color-accent-dark);
}

.lesson-block {
  position: relative;
}

.block-position {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 28px;
  color: var(--color-muted);
  font-size: 15px;
}

.block-position p {
  margin: 0;
}

.block-position span {
  margin-right: 6px;
  color: var(--color-text);
  font-weight: 700;
}

.block-number {
  margin: 0 0 2px;
  color: var(--color-accent);
  font-size: 19px;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
}

.readable-copy {
  margin-top: 28px;
}

.readable-copy p {
  margin: 0;
  font-size: 21px;
  line-height: 1.72;
}

.readable-copy p + p {
  margin-top: 16px;
}

.judgement-check {
  margin-top: 30px;
  padding-left: 18px;
  border-left: 3px solid var(--color-accent);
}

.task-list li,
.help-list li {
  margin-top: 6px;
  padding-left: 2px;
}

.checkpoint-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.checkpoint-list li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 6px;
  font-size: 18px;
}

.checkpoint-list span {
  color: var(--color-accent);
}

.help-toggle {
  margin-top: 32px;
}

.help-toggle summary {
  width: fit-content;
  color: var(--color-accent);
  font-weight: 700;
  cursor: pointer;
}

.help-list {
  margin-top: 12px;
}

.section-nav {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-top: 34px;
}

.section-nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--color-accent);
  font-weight: 650;
  overflow-wrap: anywhere;
}

.section-nav__next {
  margin-left: auto;
  text-align: right;
}

.quiz-list {
  margin-top: 22px;
}

.quiz-question {
  padding: 28px 0 18px;
}

.quiz-question + .quiz-question {
  margin-top: 14px;
}

.record-form {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.record-field {
  display: grid;
  gap: 7px;
}

.record-field > span,
.record-field legend {
  color: var(--color-text);
  font-weight: 700;
}

.record-field {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.record-field input:not([type="checkbox"]),
.record-field textarea,
.record-field select {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-field);
  color: var(--color-text);
  padding: 10px 12px;
}

.record-field input[readonly] {
  background: var(--color-field);
  color: var(--color-text);
}

.field-help {
  margin: 2px 0 0;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.55;
}

.record-field textarea {
  resize: vertical;
}

.checkbox-group {
  display: grid;
  gap: 8px;
  margin-top: 2px;
}

.checkbox-option {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  width: fit-content;
  max-width: 100%;
  min-height: 40px;
  padding: 4px 2px;
  cursor: pointer;
}

.checkbox-option input {
  width: 18px;
  height: 18px;
  margin: 5px 0 0;
  accent-color: var(--color-accent);
}

.checkbox-option span {
  color: var(--color-text);
  font-weight: 400;
  line-height: 1.62;
  overflow-wrap: anywhere;
}

.checkbox-option input:checked + span {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.checkpoint-guide {
  margin: 0 0 10px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.58;
}

.checkpoint-checks {
  margin-top: 0;
}

.self-check-option {
  grid-template-columns: 22px minmax(0, 1fr) auto;
  align-items: center;
  width: 100%;
  min-height: 44px;
}

.self-check-option strong {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.self-check-option input:checked ~ strong {
  color: var(--color-accent-dark);
}

.project-reload__lead {
  margin-top: 24px;
}

.project-reload__fields,
.block-activity__fields {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.project-reload__check {
  margin-top: 18px;
}

.project-reload__button {
  border: 0;
}

.project-reload__block-list {
  margin: 14px 0 0;
  padding-left: 1.35em;
}

.block-activity {
  margin-top: 30px;
}

.day01-notice {
  border-left: 3px solid var(--color-accent);
  padding-left: 16px;
}

.lesson-guide-figure {
  margin: 14px 0 0;
}

.lesson-guide-image {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-line);
}

.lesson-guide-caption,
.lesson-guide-summary p {
  margin: 10px 0 0;
  color: var(--color-text);
  font-size: 17px;
  line-height: 1.62;
}

.lesson-guide-details {
  margin-top: 18px;
}

.lesson-guide-details summary,
.optional-activity summary {
  width: fit-content;
  color: var(--color-accent);
  font-weight: 700;
  cursor: pointer;
}

.optional-activity {
  padding-top: 4px;
}

.optional-activity__body {
  margin-top: 16px;
}

.example-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.example-chip {
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: var(--color-field);
  color: var(--color-muted);
  padding: 4px 10px;
  font-size: 15px;
  line-height: 1.4;
}

.comparison-list {
  display: grid;
  gap: 28px;
  margin-top: 18px;
}

.comparison-item h4 {
  margin: 0 0 12px;
  color: var(--color-text);
  font-size: 18px;
  font-weight: 700;
}

.simple-choice {
  display: grid;
  gap: 8px;
  min-width: 0;
  margin: 16px 0 0;
  padding: 0;
  border: 0;
}

.simple-choice legend {
  margin-bottom: 4px;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.6;
}

.simple-choice legend span {
  display: block;
  color: var(--color-text);
  font-weight: 700;
}

.radio-option {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  width: fit-content;
  max-width: 100%;
  min-height: 38px;
  padding: 3px 2px;
  cursor: pointer;
}

.radio-option input {
  width: 18px;
  height: 18px;
  margin: 5px 0 0;
  accent-color: var(--color-accent);
}

.radio-option span {
  color: var(--color-text);
  line-height: 1.62;
  overflow-wrap: anywhere;
}

.radio-option:focus-within {
  outline: 3px solid rgba(53, 111, 102, 0.28);
  outline-offset: 3px;
}

.final-choice {
  margin-top: 30px;
}

.secondary-button {
  min-height: 44px;
  border: 1px solid var(--color-accent);
  border-radius: 8px;
  background: var(--color-field);
  color: var(--color-accent-dark);
  padding: 9px 14px;
  font-weight: 700;
  cursor: pointer;
}

.secondary-button:hover,
.secondary-button:focus-visible {
  background: var(--color-accent-soft);
}

.secondary-button:disabled {
  border-color: var(--color-line);
  color: var(--color-soft);
  cursor: not-allowed;
}

.day01-activity-sequence {
  display: grid;
  gap: 32px;
}

.day01-progress-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 22px 0 4px;
  padding: 10px 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.45;
}

.day01-progress-line__step {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 28px;
  white-space: nowrap;
}

.day01-progress-line__step strong {
  color: var(--color-soft);
  font-size: 14px;
}

.day01-progress-line__step--complete,
.day01-progress-line__step--complete strong {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.day01-progress-line__step--current {
  color: var(--color-text);
  font-weight: 750;
}

.day01-progress-line__step--current strong {
  color: var(--color-accent);
}

.day01-progress-line__step--upcoming {
  opacity: 0.68;
}

.day01-progress-line__connector {
  width: 18px;
  height: 1px;
  background: var(--color-line);
}

.scenario-grid,
.match-board,
.makecode-menu-grid,
.pill-grid,
.evidence-grid {
  display: grid;
  gap: 12px;
}

.scenario-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
}

.problem-discovery-activity {
  width: min(960px, calc(100vw - 48px));
}

.problem-discovery-board {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.9fr);
  gap: 16px;
  align-items: start;
  margin-top: 18px;
}

.problem-discovery-situations h4,
.problem-discovery-panel h4 {
  margin: 0;
  color: var(--color-text);
  font-size: 17px;
  font-weight: 750;
  line-height: 1.45;
}

.problem-discovery-situation-grid {
  margin-top: 10px;
  gap: 10px;
}

.problem-discovery-board .scenario-card {
  min-height: 142px;
  padding: 10px;
}

.problem-discovery-board .scenario-card__media {
  min-height: 48px;
}

.problem-discovery-board .scenario-card__media img {
  height: 58px;
}

.problem-discovery-board .scenario-card__description {
  font-size: 14px;
  line-height: 1.5;
}

.problem-discovery-panel {
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-field);
}

.problem-discovery-panel__inner {
  display: grid;
  gap: 14px;
  padding: 14px;
}

.problem-discovery-panel__header {
  display: grid;
  gap: 6px;
}

.problem-discovery-panel__header p {
  margin: 0;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.55;
}

.problem-discovery-panel__header strong {
  display: block;
  color: var(--color-text);
  font-size: 18px;
  line-height: 1.45;
}

.problem-meaning-options {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  border: 0;
}

.problem-meaning-options legend {
  margin-bottom: 2px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.5;
}

.problem-meaning-option {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 9px;
  align-items: start;
  min-width: 0;
  padding: 8px 9px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: #ffffff;
  cursor: pointer;
}

.problem-meaning-option input {
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  accent-color: var(--color-accent);
}

.problem-meaning-option span {
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.problem-meaning-option:has(input:checked) {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.problem-meaning-option input:checked + span {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.scenario-card,
.match-card,
.menu-card,
.pill-button {
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-field);
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
  overflow-wrap: anywhere;
}

.scenario-card {
  position: relative;
  display: grid;
  gap: 8px;
  min-height: 172px;
  padding: 12px;
}

.scenario-card__media {
  min-height: 58px;
  display: grid;
  place-items: center;
  border: 1px dashed var(--color-line);
  border-radius: 8px;
  color: var(--color-muted);
  font-size: 14px;
}

.scenario-card__media img {
  display: block;
  width: 100%;
  height: 78px;
  object-fit: contain;
}

.scenario-card__title {
  font-weight: 750;
}

.scenario-card__description {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.58;
}

.scenario-card__mark {
  position: absolute;
  top: 10px;
  right: 10px;
  border-radius: 999px;
  background: var(--color-accent);
  color: #ffffff;
  padding: 3px 8px;
  font-size: 13px;
}

.scenario-card:hover,
.scenario-card.is-selected,
.match-card:hover,
.match-card.is-selected,
.menu-card:hover,
.menu-card.is-selected,
.pill-button:hover,
.pill-button.is-selected {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.problem-summary {
  margin-top: 2px;
  padding-top: 14px;
  border-top: 1px solid var(--color-line);
}

.problem-summary p {
  margin: 0 0 4px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.5;
}

.problem-summary strong {
  display: block;
  color: var(--color-text);
  font-size: 18px;
  line-height: 1.62;
  white-space: pre-line;
}

.problem-summary--empty strong {
  color: var(--color-muted);
  font-weight: 650;
}

.problem-summary.activity-result,
.code-prediction-preview.activity-result,
.shake-code-preview.activity-result,
.lesson-guide-summary.activity-result {
  margin-top: 14px;
  padding: 13px 15px;
  border: 0;
  border-left: 3px solid var(--color-accent);
  border-radius: 0 8px 8px 0;
  background: var(--color-accent-soft);
}

.connection-prompt {
  color: var(--color-text);
  font-weight: 700;
}

.match-board {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.match-column h4,
.day01-nested-group h4,
.toolbox h4 {
  margin: 0 0 10px;
  color: var(--color-text);
  font-size: 16px;
  font-weight: 750;
}

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

.match-card,
.menu-card,
.pill-button {
  min-height: 44px;
  padding: 9px 12px;
}

.research-order-activity {
  width: 100%;
}

.research-order-area {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.research-order-area h4 {
  margin: 0;
  color: var(--color-text);
  font-size: 16px;
  font-weight: 750;
}

.research-order-area p {
  margin: 0;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.55;
}

.research-order-scroll {
  max-width: 100%;
  overflow-x: auto;
  padding: 2px 0 8px;
}

.research-order-card-row,
.research-order-slots {
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 8px;
  min-width: max-content;
  margin: 0;
  padding: 0;
}

.research-order-slots {
  gap: 18px;
  list-style: none;
}

.research-order-card,
.research-order-slot {
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-field);
  color: var(--color-text);
  text-align: center;
  cursor: grab;
}

.research-order-card {
  display: grid;
  place-items: center;
  width: 92px;
  min-height: 52px;
  padding: 8px 7px;
  font-weight: 700;
  line-height: 1.35;
}

.research-order-slot-wrap {
  position: relative;
}

.research-order-slot-wrap:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 44px;
  right: -14px;
  color: var(--color-muted);
  font-weight: 700;
}

.research-order-slot {
  display: grid;
  grid-template-rows: auto minmax(48px, 1fr);
  gap: 6px;
  width: 88px;
  min-height: 96px;
  padding: 9px 7px;
  border-style: dashed;
}

.research-order-slot.is-filled {
  border-style: solid;
}

.research-order-slot__number {
  display: inline-grid;
  place-items: center;
  justify-self: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  color: var(--color-accent);
  font-weight: 750;
  line-height: 1;
}

.research-order-slot__content {
  align-self: center;
  color: var(--color-muted);
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.research-order-slot.is-filled .research-order-slot__content {
  color: var(--color-text);
  font-weight: 700;
}

.research-order-card:hover,
.research-order-card.is-selected,
.research-order-card.is-dragging,
.research-order-slot:hover,
.research-order-slot.is-selected,
.research-order-slot.is-drag-over,
[data-research-order-pool].is-drag-over {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.research-order-card.is-dragging,
.research-order-slot.is-dragging {
  opacity: 0.72;
}

.research-order-empty {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 52px;
  margin: 0;
  border: 1px dashed var(--color-line);
  border-radius: 8px;
  color: var(--color-muted);
  padding: 8px 12px;
}

.research-order-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

.research-order-actions .field-help {
  margin: 0;
}

.research-order-scroll-hint {
  display: none;
}

.pill-grid,
.makecode-menu-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.compact-choice-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.role-guide {
  display: grid;
  gap: 4px;
}

.role-guide p {
  margin: 0;
  color: var(--color-muted);
}

.role-guide p:first-child {
  color: var(--color-text);
  font-weight: 700;
}

.role-grid .pill-button {
  display: grid;
  gap: 3px;
}

.role-grid .pill-button strong {
  font-size: 16px;
}

.role-grid .pill-button span {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.5;
}

.role-grid .pill-button.is-selected span {
  color: var(--color-accent-dark);
}

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

.shake-transition__item {
  display: grid;
  gap: 4px;
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-field);
  padding: 10px 12px;
}

.shake-transition__item span {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.4;
}

.shake-transition__item strong {
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.shake-transition__item--current {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.shake-activity-board {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.shake-step {
  display: grid;
  gap: 10px;
}

.shake-step h4 {
  margin: 0;
  color: var(--color-text);
  font-size: 17px;
  font-weight: 750;
  line-height: 1.45;
}

.shake-menu-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 0;
}

.shake-menu-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  min-height: 54px;
  padding: 10px;
}

.shake-menu-card span {
  font-weight: 750;
  line-height: 1.35;
}

.shake-menu-card__mark {
  color: var(--color-accent-dark);
  font-size: 13px;
  line-height: 1.3;
}

.shake-led-choice {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 0;
}

.shake-led-choice legend {
  grid-column: 1 / -1;
  margin-bottom: 0;
  color: var(--color-text);
  font-size: 17px;
  font-weight: 750;
  line-height: 1.45;
}

.shake-led-option {
  width: 100%;
  min-height: 54px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-field);
  padding: 9px 10px;
}

.shake-led-option.is-selected {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.shake-led-option span {
  font-weight: 700;
}

.shake-led-option__mark {
  justify-self: end;
  color: var(--color-accent-dark);
  font-size: 13px;
  white-space: nowrap;
}

.shake-code-preview {
  display: grid;
  gap: 8px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: #f7faf8;
  padding: 12px;
}

.shake-code-preview__title {
  margin: 0;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.45;
}

.shake-code-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 10px;
  align-items: stretch;
}

.shake-code-flow span {
  display: grid;
  gap: 3px;
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: #ffffff;
  padding: 9px 10px;
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.shake-code-flow strong {
  color: var(--color-accent-dark);
  font-size: 14px;
}

.shake-code-flow .shake-code-flow__arrow {
  align-self: center;
  border: 0;
  background: transparent;
  padding: 0;
  color: var(--color-muted);
  font-weight: 800;
}

.shake-checklist {
  margin-top: 0;
}

.ipo-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
  margin-top: 16px;
}

.ipo-flow__item {
  display: grid;
  gap: 3px;
  flex: 1 1 156px;
  min-width: 0;
  border-top: 1px solid var(--color-line);
  padding-top: 9px;
}

.ipo-flow__item strong {
  color: var(--color-accent-dark);
  font-size: 15px;
}

.ipo-flow__item span {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.45;
}

.ipo-flow__item p {
  margin: 0;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.55;
}

.ipo-flow__arrow {
  align-self: center;
  color: var(--color-muted);
  font-weight: 700;
}

.code-prediction-goal {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(150px, 0.9fr) auto minmax(0, 1fr);
  gap: 10px;
  align-items: stretch;
  margin-top: 16px;
}

.code-prediction-goal__item,
.code-prediction-goal__question {
  display: grid;
  align-content: center;
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-field);
  padding: 10px 12px;
}

.code-prediction-goal__item strong {
  color: var(--color-accent-dark);
  font-size: 15px;
}

.code-prediction-goal__item p {
  margin: 3px 0 0;
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.5;
}

.code-prediction-goal__question {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-size: 15px;
  font-weight: 750;
  text-align: center;
  line-height: 1.45;
}

.code-prediction-goal__arrow {
  align-self: center;
  color: var(--color-muted);
  font-weight: 800;
}

.code-prediction-blocks {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.code-prediction-choice {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  min-width: 0;
  min-height: 58px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-field);
  color: var(--color-text);
  padding: 10px 11px;
  text-align: left;
  cursor: pointer;
}

.code-prediction-choice span {
  overflow-wrap: anywhere;
  font-weight: 700;
  line-height: 1.38;
}

.code-prediction-choice__mark {
  color: var(--color-accent-dark);
  font-size: 14px;
  white-space: nowrap;
}

.code-prediction-choice:hover,
.code-prediction-choice.is-selected {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.code-prediction-limit {
  margin-top: 8px;
}

.code-prediction-limit--warning {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.code-prediction-preview {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: #f7faf8;
  padding: 12px;
}

.code-prediction-preview__title {
  margin: 0;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.45;
}

.code-preview-block {
  display: grid;
  gap: 10px;
  border: 1px solid var(--color-accent);
  border-radius: 8px;
  background: #ffffff;
  padding: 12px;
}

.code-preview-block > strong {
  color: var(--color-accent-dark);
  font-size: 16px;
  line-height: 1.4;
}

.code-preview-block__body {
  display: grid;
  gap: 8px;
  margin-left: 18px;
  padding-left: 12px;
  border-left: 2px solid var(--color-line);
}

.code-preview-action {
  display: block;
  width: fit-content;
  max-width: 100%;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: var(--color-accent-soft);
  color: var(--color-text);
  padding: 8px 12px;
  font-weight: 700;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.code-preview-placeholder {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.5;
}

.code-preview-block--missing-event {
  border-color: var(--color-line);
}

.day01-nested-group {
  margin-top: 22px;
}

.day01-led-choice {
  margin-top: 18px;
}

.toolbox {
  margin-top: 18px;
  padding: 14px 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.toolbox__items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tool-chip {
  border: 1px solid var(--color-line);
  border-radius: 999px;
  color: var(--color-muted);
  padding: 5px 10px;
  font-size: 15px;
  line-height: 1.4;
}

.tool-chip.is-unlocked {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-weight: 700;
}

.free-lab-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.idea-draw {
  margin-top: 20px;
}

.idea-draw p {
  margin-top: 10px;
  color: var(--color-accent-dark);
  font-weight: 700;
}

.makecode-link-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 12px;
  margin-top: 16px;
}

.makecode-open-link {
  margin-top: 14px;
}

.day02-connection-guide,
.day02-block-guide,
.day02-logic-guide,
.day02-basic-code,
.day03-info-group,
.day03-makecode-start,
.day03-measurement-panel,
.day03-direction-group,
.day03-test-lab,
.day03-condition-gate,
.day03-revise-group,
.day03-change-group {
  border-top: 1px solid var(--color-line);
  padding-top: 16px;
}

.day02-guide-grid {
  display: grid;
  gap: 14px;
  justify-items: center;
  align-items: start;
  margin-top: 12px;
}

.day02-guide-grid--locator {
  grid-template-columns: repeat(2, minmax(0, 360px));
  justify-content: center;
}

.day02-logic-guide .day02-guide-grid--locator {
  grid-template-columns: minmax(0, 360px);
}

.day02-guide-grid--code {
  grid-template-columns: minmax(0, 1fr);
}

.lesson-guide-figure--locator,
.lesson-guide-figure--code-example,
.lesson-guide-figure--pairing-guide,
.lesson-guide-figure--wide {
  margin-right: auto;
  margin-left: auto;
}

.lesson-guide-figure--locator {
  width: min(100%, 340px);
}

.lesson-guide-figure--code-example {
  width: min(100%, 500px);
}

.lesson-guide-figure--pairing-guide {
  width: min(100%, 760px);
}

.lesson-guide-figure--wide {
  width: min(100%, 780px);
}

.day03-help-details__body {
  margin-top: 14px;
}

.day03-field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
  gap: 12px;
  margin-top: 14px;
  max-width: 760px;
}

.day03-number-field {
  min-width: 0;
}

.day03-makecode-button {
  margin-top: 12px;
  margin-bottom: 8px;
}

.day03-angle-test,
.day03-final-code {
  display: grid;
  gap: 12px;
}

.day03-record-form {
  margin-top: 22px;
}

.day03-record-summary li {
  grid-template-columns: 24px minmax(124px, 0.75fr) minmax(0, 1.25fr);
}

.day03-source-section {
  display: grid;
  gap: 16px;
}

.day03-source-section h2,
.day03-source-section h3,
.day03-source-section h4,
.day03-source-section p {
  margin: 0;
}

.day03-source-section h3 {
  margin-top: 8px;
}

.day03-source-section h4 {
  color: var(--color-text);
  font-size: 1rem;
}

.day03-source-meta-list,
.day03-source-list {
  margin: 0;
  padding-left: 1.25rem;
}

.day03-source-meta-list,
.day03-source-list,
.day03-source-section p {
  line-height: 1.64;
}

.day03-source-quote {
  margin: 0;
  padding: 14px 16px;
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 8px;
  line-height: 1.7;
}

.day03-source-placeholder {
  font-weight: 700;
  color: var(--color-accent-dark);
}

.day03-source-figure {
  margin-top: 2px;
}

.day03-source-table-wrap {
  overflow-x: auto;
}

.day03-source-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  line-height: 1.55;
}

.day03-source-table th,
.day03-source-table td {
  padding: 10px 12px;
  border: 1px solid var(--color-line);
  text-align: left;
  vertical-align: middle;
}

.day03-source-table th {
  background: var(--color-accent-soft);
  font-weight: 800;
}

.day03-source-input {
  width: min(100%, 180px);
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  font: inherit;
  color: var(--color-text);
  background: var(--color-field);
}

.day03-source-position-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 12px;
}

.day03-source-inline-field {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  line-height: 1.5;
}

.day03-source-action {
  justify-content: flex-start;
}

.day03-source-section .webcam-panel {
  margin-top: 0;
}

.day03-source-section .choice-button {
  white-space: normal;
  text-align: left;
}

.day03-source-section .day03-record-summary {
  display: grid;
  gap: 6px;
}

.day03-source-section .day03-record-summary li {
  display: list-item;
}

.day02-guide-bridge {
  margin-top: 16px;
  text-align: center;
}

.day02-threshold-concept {
  display: grid;
  gap: 8px;
  max-width: 68ch;
  margin-top: 12px;
}

.day02-threshold-concept p {
  margin: 0;
  line-height: 1.62;
}

.day02-threshold-prompt {
  margin-top: 14px;
}

.day02-copy-stack {
  display: grid;
  gap: 8px;
  max-width: 72ch;
}

.day02-copy-stack p,
.day02-threshold-decision p,
.day02-threshold-experiment p,
.day02-test-item p,
.day02-test-success p,
.day02-peer-compare p {
  margin: 0;
  line-height: 1.62;
}

.day02-measurement-list,
.day02-test-list {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.day02-measurement-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(150px, 220px);
  align-items: start;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--color-line);
}

.day02-measurement-row h5,
.day02-test-item h5 {
  margin: 0 0 8px;
  font-size: 17px;
}

.day02-number-field {
  margin: 0;
}

.day02-choice-row {
  margin-top: 8px;
}

.day02-discovery-fields,
.day02-reflection,
.day02-observation-review,
.day02-threshold-decision,
.day02-threshold-reason,
.day02-threshold-experiment,
.day02-test-lab,
.day02-test-summary,
.day02-threshold-revise,
.day02-test-success,
.day02-peer-compare,
.day02-free-lead {
  border-top: 1px solid var(--color-line);
  padding-top: 16px;
}

.day02-value-pair {
  display: grid;
  gap: 10px;
  margin: 12px 0 0;
}

.day02-value-pair div {
  display: grid;
  grid-template-columns: minmax(160px, 0.45fr) minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.day02-value-pair dt {
  color: var(--color-muted);
  font-weight: 700;
}

.day02-value-pair dd {
  margin: 0;
  font-weight: 800;
}

.day02-reflection-feedback,
.day02-test-item {
  display: grid;
  gap: 8px;
}

.day02-test-item {
  padding: 12px 0;
  border-top: 1px solid var(--color-line);
}

.day02-threshold-revise .secondary-button {
  justify-self: start;
  margin-top: 12px;
}

.day02-adjusted-video-note {
  max-width: 72ch;
  margin: 0 0 12px;
}

.day02-rule-preview .field-help {
  margin-bottom: 10px;
}

.day02-condition-gate {
  display: grid;
  justify-content: start;
  gap: 10px;
  margin-top: 22px;
}

.day02-condition-instructions {
  display: grid;
  gap: 6px;
  max-width: 68ch;
}

.day02-condition-instructions p {
  margin: 0;
  line-height: 1.62;
}

.day02-condition-gate .primary-link,
.day02-condition-gate .secondary-button {
  justify-self: start;
  min-width: 240px;
  max-width: 100%;
  padding: 12px 20px;
  white-space: nowrap;
}

.day02-basic-code pre {
  margin: 12px 0 0;
  padding: 14px 16px;
  overflow-x: auto;
  border-radius: 8px;
  background: #f4f7f2;
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.6;
}

.day02-basic-code code {
  font-family: Consolas, "Courier New", monospace;
  white-space: pre;
}

.webcam-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(240px, 0.85fr);
  gap: 18px;
  margin-top: 18px;
}

.webcam-preview {
  display: grid;
  gap: 10px;
}

.webcam-preview video,
.webcam-preview iframe,
.evidence-card video,
.evidence-card iframe {
  display: block;
  width: 100%;
  min-height: 220px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: #111817;
}

.webcam-preview iframe,
.evidence-card iframe {
  aspect-ratio: 16 / 9;
}

.webcam-status,
.webcam-countdown {
  margin: 0;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.62;
}

.webcam-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.webcam-panel--day02 .webcam-grid {
  grid-template-columns: minmax(0, 1fr);
  max-width: 760px;
}

.webcam-panel--day02 .webcam-controls {
  display: grid;
  gap: 12px;
  width: 100%;
  max-width: 680px;
  min-width: 0;
}

.webcam-panel--day02 .webcam-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 128px), 1fr));
  width: 100%;
  max-width: 680px;
  min-width: 0;
}

.webcam-panel--day02 .webcam-buttons .secondary-button {
  white-space: nowrap;
}

.teacher-ingest {
  margin-top: 18px;
}

.teacher-ingest summary {
  width: fit-content;
  color: var(--color-accent);
  font-weight: 700;
  cursor: pointer;
}

.teacher-ingest__fields {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.evidence-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 24px;
}

.evidence-card {
  border-top: 1px solid var(--color-line);
  padding-top: 14px;
}

.evidence-card h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.evidence-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.6;
  white-space: pre-line;
}

.evidence-card--complete p {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.evidence-card a {
  display: inline-flex;
  margin-top: 8px;
  font-weight: 700;
}

.matching-quiz {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.completion-requirements {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.completion-requirements li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  min-height: 42px;
}

.completion-requirements span {
  color: var(--color-accent);
  font-weight: 750;
}

.completion-requirements strong {
  font-size: 17px;
}

.completion-requirements a {
  font-size: 15px;
  font-weight: 700;
  text-align: right;
}

.completion-requirements em {
  color: var(--color-muted);
  font-size: 15px;
  font-style: normal;
  text-align: right;
  overflow-wrap: anywhere;
}

.day02-record-summary li {
  grid-template-columns: 24px minmax(96px, 0.75fr) minmax(0, 1.25fr);
}

.day02-threshold-field {
  max-width: 360px;
}

.day02-video-nav {
  margin-top: 18px;
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .page {
    width: min(100% - 28px, 960px);
    padding: 30px 0 52px;
  }

  .app-header {
    display: block;
    margin-bottom: 34px;
  }

  .app-header__meta {
    margin-top: 10px;
    text-align: left;
  }

  .student-control {
    justify-content: flex-start;
  }

  .student-name {
    white-space: normal;
  }

  .save-state--floating {
    right: max(14px, env(safe-area-inset-right));
    bottom: max(14px, env(safe-area-inset-bottom));
    max-width: min(258px, calc(100vw - 28px));
    font-size: 13px;
  }

  .identity-gate__heading h1 {
    font-size: 26px;
  }

  .research-day {
    padding: 9px 10px;
  }

  .research-day__line {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 9px;
  }

  .research-day__link {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 9px;
  }

  .research-day--current .research-day__title {
    font-size: 20px;
  }

  .research-day__description,
  .section-description,
  .next-connection {
    font-size: 17px;
  }

  .research-day__body {
    margin-left: 47px;
  }

  .section-title {
    font-size: 29px;
  }

  .question-text,
  .carried-result {
    font-size: 20px;
  }

  .core-statement {
    font-size: 26px;
  }

  .big-question {
    font-size: 22px;
  }

  .readable-copy p {
    font-size: 19px;
  }

  .match-board,
  .webcam-grid,
  .day02-measurement-row,
  .free-lab-grid {
    grid-template-columns: 1fr;
  }

  .day02-value-pair div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .research-order-scroll-hint {
    display: block;
  }

  .webcam-preview video,
  .webcam-preview iframe,
  .evidence-card video,
  .evidence-card iframe {
    min-height: 190px;
  }

  .problem-discovery-activity {
    width: 100%;
  }

  .problem-discovery-board {
    grid-template-columns: 1fr;
  }

  .code-prediction-goal {
    grid-template-columns: 1fr;
  }

  .code-prediction-goal__arrow {
    justify-self: center;
    transform: rotate(90deg);
  }

  .shake-transition,
  .shake-code-flow {
    grid-template-columns: 1fr;
  }

  .shake-code-flow .shake-code-flow__arrow {
    justify-self: center;
    transform: rotate(90deg);
  }
}

@media (max-width: 520px) {
  .section-nav {
    display: grid;
  }

  .section-nav__next {
    justify-self: end;
    margin-left: 0;
  }

  .scenario-grid,
  .pill-grid,
  .makecode-menu-grid,
  .compact-choice-list,
  .evidence-grid,
  .code-prediction-blocks,
  .shake-menu-grid,
  .shake-led-choice,
  .makecode-link-row {
    grid-template-columns: 1fr;
  }

  .makecode-link-row {
    align-items: stretch;
  }

  .day02-guide-grid--locator {
    grid-template-columns: 1fr;
  }

  .day02-condition-gate .primary-link,
  .day02-condition-gate .secondary-button {
    min-width: 0;
    width: 100%;
  }

  .self-check-option {
    grid-template-columns: 22px minmax(0, 1fr);
  }

  .self-check-option strong {
    grid-column: 2;
  }

  .completion-requirements li {
    grid-template-columns: 24px minmax(0, 1fr);
  }

  .completion-requirements a {
    grid-column: 2;
    text-align: left;
  }

  .completion-requirements em {
    grid-column: 2;
    text-align: left;
  }
}

@media (max-width: 420px) {
  .page-heading h1 {
    font-size: 24px;
  }

  .current-location {
    font-size: 16px;
  }

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

  .research-day__status {
    grid-column: 2;
  }

  .research-day__body {
    margin-left: 45px;
  }

  .research-day__actions {
    justify-content: flex-end;
  }

  .start-button {
    width: auto;
  }

  .section-title {
    font-size: 27px;
  }

  .core-statement {
    font-size: 24px;
  }

  .primary-link {
    max-width: 100%;
    text-align: center;
  }

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

  .research-summary-list li {
    grid-template-columns: 38px minmax(0, 1fr);
  }

  .research-summary-list strong {
    grid-column: 2;
  }
}

.day04-progress__title,
.day04-step-label {
  color: var(--color-soft);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.day04-progress__title {
  width: 100%;
  color: var(--color-text);
}

.day04-branch-question,
.day04-ai-request,
.day04-ai-check,
.day04-reality-check,
.day04-example-answer {
  border-left: 3px solid var(--color-accent);
  background: var(--color-accent-soft);
  padding: 1rem 1.2rem;
}

.day04-ai-answers {
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding: 1.2rem 0;
}

.day04-ai-answers article {
  position: relative;
  margin-top: 1rem;
  padding-left: 2.4rem;
}

.day04-answer-badge {
  position: absolute;
  left: 0;
  top: 0.2rem;
  display: inline-grid;
  width: 1.8rem;
  height: 1.8rem;
  place-items: center;
  border: 1px solid var(--color-line);
  border-radius: 50%;
  background: var(--color-field);
  font-weight: 700;
}

.day04-example-answer {
  margin: 1rem 0;
}

.day05-lesson { display: grid; gap: 1rem; }
.day05-progress { display: flex; flex-wrap: wrap; gap: .45rem; align-items: center; color: var(--muted-text, #657080); font-size: .9rem; }
.day05-a-grid, .day05-b-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; align-items: start; }
.day05-scene { margin: 0; text-align: center; }
.day05-scene img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: contain; border-radius: .8rem; background: #f2f5f7; }
.day05-practice-card { display: grid; gap: .7rem; align-content: start; padding: 1rem; border: 1px solid #dfe5ea; border-radius: .9rem; }
.day05-practice-card .section-kicker, .day05-practice-card .field-help { margin: 0; }
.day05-instruction { margin: -.25rem 0 .2rem; color: var(--muted-text, #657080); }
.day05-question { margin: .25rem 0 0; font-weight: 700; }
.day05-a-response { display: grid; gap: .7rem; }
.day05-a-response .record-field { margin: 0; }
.day05-reality-check { margin: .75rem 0; padding: .75rem; border-radius: .7rem; background: #f4f7fb; }
.day05-reality-check p { margin: 0 0 .45rem; font-weight: 700; }
.day05-definition-input { min-height: 7rem; font-weight: 700; line-height: 1.7; }
.day05-scene-card { position: relative; display: grid; gap: .35rem; width: 100%; padding: .55rem; border: 2px solid #d9e0e7; border-radius: .9rem; background: #fff; color: inherit; text-align: left; cursor: pointer; }
.day05-scene-card.is-selected { border-color: #2769d1; box-shadow: 0 0 0 3px rgba(39,105,209,.15); }
.day05-scene-card > b { position: absolute; top: .8rem; right: .8rem; padding: .2rem .45rem; border-radius: 50%; background: #2769d1; color: #fff; }
.day05-field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }
.day05-field-grid .record-field:last-child { grid-column: 1 / -1; }
.day05-candidate, .day05-final-card { padding: 1rem; border: 1px solid #dfe5ea; border-radius: .85rem; margin-bottom: .8rem; }
.day05-final-card.is-selected { border-color: #2769d1; box-shadow: 0 0 0 2px rgba(39,105,209,.12); }
.day05-definition-sentence { padding: 1rem; border-radius: .75rem; background: #f4f7fb; font-size: 1.08rem; line-height: 1.75; }
.day05-final-card .choice-list { margin: .75rem 0; }
.day05-record-list { display: grid; gap: .75rem; margin: 1rem 0; padding: 0; list-style: none; }
.day05-record-list li { display: grid; grid-template-columns: minmax(10rem, 0.38fr) minmax(0, 1fr); align-items: start; gap: .75rem; min-width: 0; padding: .8rem; border: 1px solid #dfe5ea; border-radius: .7rem; }
.day05-record-list li > span { min-width: 0; color: var(--muted-text, #657080); font-weight: 700; }
.day05-record-list li > strong { min-width: 0; font-weight: 600; line-height: 1.6; overflow-wrap: anywhere; word-break: normal; }
@media (max-width: 700px) { .day05-a-grid, .day05-b-grid, .day05-field-grid { grid-template-columns: 1fr; } .day05-field-grid .record-field:last-child { grid-column: auto; } .day05-progress { font-size: .78rem; } }
@media (max-width: 520px) { .day05-record-list li { grid-template-columns: minmax(0, 1fr); gap: .25rem; } }

/* Day06 follows the existing lesson rhythm with plain separators and collapsible steps. */
.day06-lesson { max-width: 760px; }
.day06-opening .day06-position { margin: 0 0 14px; color: var(--color-muted); font-size: 16px; line-height: 1.6; overflow-wrap: anywhere; }
.day06-todo-list, .day06-example-list, .day06-criteria-list { margin: 12px 0 0; padding-left: 1.4em; }
.day06-todo-list li, .day06-example-list li, .day06-criteria-list li { margin-top: 8px; line-height: 1.65; overflow-wrap: anywhere; }
.day06-step-details > summary { display: list-item; cursor: pointer; overflow-wrap: anywhere; }
.day06-step-details > summary:focus-visible { outline: 3px solid rgba(53, 111, 102, 0.28); outline-offset: 5px; }
.day06-step-details[open] > summary { margin-bottom: 24px; }
.day06-step-content { display: grid; gap: 18px; min-width: 0; line-height: 1.7; }
.day06-step-content > p, .day06-step-content .plain-group > p { margin: 0; }
.day06-step-action { padding: 12px 14px; border-left: 3px solid var(--color-accent); background: var(--color-accent-soft); }
.day06-step-locked { margin: 0; overflow-wrap: anywhere; }
.day06-subheading { margin: 10px 0 -10px; color: var(--color-text); font-weight: 700; }
.day06-record-values { display: grid; gap: 0 20px; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 0; }
.day06-record-values > div { min-width: 0; padding: 12px 0; border-bottom: 1px solid var(--color-line); }
.day06-record-values dt { color: var(--color-muted); font-size: 15px; font-weight: 600; }
.day06-record-values dd { margin: 3px 0 0; color: var(--color-text); overflow-wrap: anywhere; }
.day06-record-reason, .day06-guidance { margin: 14px 0 0; line-height: 1.7; overflow-wrap: anywhere; }
.day06-record-empty { margin: 0; line-height: 1.7; }
.day06-record-actions, .day06-problem-decisions, .day06-save-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.day06-record-actions .secondary-button { display: inline-flex; align-items: center; text-decoration: none; }
.day06-problem-decisions .choice-button { max-width: 100%; white-space: normal; text-align: left; }
.day06-problem-edit { display: grid; gap: 12px; margin-top: 16px; }
.day06-problem-edit[hidden] { display: none; }
.day06-latest-problem { margin: 0; overflow-wrap: anywhere; }
.day06-starting-sentence { color: var(--color-text); font-size: 19px; font-weight: 700; }
.day06-idea-inputs { display: grid; gap: 18px; }
.day06-idea-inputs .record-field, .day06-friend-question .record-field, .day06-step-content > .record-field { min-width: 0; }
.day06-idea-inputs input, .day06-friend-question input, #day06-next-question, #day06-reason { width: 100%; max-width: 100%; }
.day06-comparison-list { gap: 26px; }
.day06-comparison-progress { margin: 0; font-weight: 600; overflow-wrap: anywhere; }
.day06-comparison-item { min-width: 0; padding-top: 18px; border-top: 1px solid var(--color-line); }
.day06-comparison-item[hidden] { display: none; }
.day06-comparison-item h3 { margin: 0; line-height: 1.6; overflow-wrap: anywhere; }
.day06-friend-question { margin-top: 10px; }
.day06-self-check ul { margin: 10px 0 0; padding-left: 1.4em; }
.day06-self-check li { margin-top: 8px; line-height: 1.65; }
.day06-self-check li.is-complete { color: var(--color-accent-dark); font-weight: 700; }
.day06-save-actions { margin-top: 20px; }
.day06-save-status { margin: 10px 0 0; line-height: 1.65; overflow-wrap: anywhere; }
.day06-record-summary { display: grid; gap: 8px; margin: 20px 0; padding: 14px 0; border-top: 1px solid var(--color-line); border-bottom: 1px solid var(--color-line); }
.day06-record-summary p { margin: 0; overflow-wrap: anywhere; }
.day06-complete [data-day06-saved-message] { line-height: 1.7; }
.day06-next-guidance { margin: 0; line-height: 1.7; overflow-wrap: anywhere; }
.day06-next-actions { justify-content: flex-start; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
@media (max-width: 600px) {
  .day06-record-values { grid-template-columns: minmax(0, 1fr); }
  .day06-opening .day06-position { font-size: 15px; }
  .day06-problem-decisions, .day06-record-actions, .day06-save-actions, .day06-next-actions { align-items: stretch; flex-direction: column; }
  .day06-problem-decisions > *, .day06-record-actions > *, .day06-save-actions > *, .day06-next-actions > * { width: 100%; }
}
.day07-section { scroll-margin-top: 1rem; }
.day07-section summary { cursor: pointer; }
.day07-section-body { display: grid; gap: .8rem; padding-top: 1rem; }
.day07-section-body p, .day07-section-body ul { margin: .25rem 0; }
.day07-sensors { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 270px), 1fr)); gap: 1rem; }
.day07-sensor { min-width: 0; padding: 1rem; border: 1px solid #ccd9d9; border-radius: 1rem; background: #fff; }
.day07-sensor h3 { margin-top: 0; }
.day07-sensor details { padding-top: .5rem; }
.day07-sensor summary { min-height: 44px; font-weight: 700; }
.day07-sensor input[type="range"] { width: 100%; min-height: 44px; touch-action: pan-y; }
.day07-sensor-identification { display: grid; grid-template-columns: minmax(0, 46%) minmax(0, 1fr); align-items: center; gap: .75rem; }
.day07-sensor-image { display: block; width: 100%; height: 144px; object-fit: contain; }
.day07-sensor-identification p { min-width: 0; overflow-wrap: anywhere; }
@media (max-width: 480px) {
  .day07-sensor-image { height: 126px; }
}
.day07-sensor-readout { font-weight: 700; }
.day07-led { display: grid; place-items: center; width: 4rem; height: 4rem; border-radius: .5rem; background: #263e48; color: #aeb7b9; font-size: 2.5rem; }
.day07-sensor.is-alert .day07-led { color: #ffe058; box-shadow: 0 0 0 4px #ffe05844; }
.day07-sensor[data-day07-card="light"] { background: rgb(255 246 205 / var(--day07-light, .75)); }
.day07-sensor[data-day07-card="distance"] .day07-led { margin-left: min(var(--day07-distance, 75%), calc(100% - 4rem)); max-width: 25%; }
.day07-sensor[data-day07-card="temp"] .day07-led { border-bottom: 8px solid #e76e56; }
.day07-quiz { min-width: 0; border: 1px solid #ccd9d9; border-radius: .5rem; }
.day07-quiz .radio-option { min-height: 44px; }
.day07 input, .day07 textarea, .day07 select { max-width: 100%; }

/* Day06/Day07: one image and one action, no additional instructions. */
.day-image-evidence img[data-day-image-preview] { display: block; width: min(100%, 720px); height: auto; max-height: 520px; object-fit: contain; margin: 0 0 12px; border-radius: 8px; }
.day-image-evidence img[hidden] { display: none; }
.day-image-status:empty { display: none; }
.day-image-status { font-size: 0.9rem; margin: 8px 0 0; }