.challenge-page { font-size: 1rem; line-height: 1.55; }
.challenge-head { padding: 3.25rem 0 1.1rem; }
.challenge-head .page-title { max-width: 18ch; font-size: clamp(2.25rem, 5.5vw, 3.6rem); line-height: 1.08; }
.challenge-head .sub { max-width: 40rem; font-size: clamp(1.05rem, 1.8vw, 1.25rem); }
.challenge-wrap { width: min(100% - 2.5rem, 57rem); padding-bottom: 4.5rem; }
.challenge-app { min-height: 18rem; padding: clamp(1.2rem, 3.5vw, 2rem); border: 1px solid var(--hair); border-radius: 18px; background: var(--alt); }
.challenge-note { max-width: 57rem; margin: 1rem auto 0; color: var(--muted); font-size: 0.82rem; }
.challenge-step-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 1.3rem; }
.challenge-step-label { margin: 0; color: var(--accent); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; }
.challenge-back { border: 0; background: transparent; color: var(--muted); min-height: 36px; padding: 0.3rem 0; font-size: 0.9rem; text-decoration: underline; text-underline-offset: 4px; cursor: pointer; }
.challenge-back:hover { color: var(--ink); }
.challenge-app h2 { margin: 0; font-size: clamp(1.35rem, 3vw, 1.8rem); letter-spacing: -0.035em; }
.challenge-lead { margin: 0.5rem 0 1.25rem; max-width: 44rem; color: var(--muted); font-size: 0.95rem; }
.subject-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0.65rem; }
.subject-choice, .partner-choice, .case-choice { text-align: left; color: var(--ink); border: 1px solid var(--hair); background: var(--canvas); cursor: pointer; transition: border-color 0.18s, background 0.18s, transform 0.18s; }
.subject-choice { display: flex; min-height: 4rem; align-items: center; padding: 0.8rem 0.9rem; border-radius: 11px; font-size: 0.93rem; font-weight: 600; }
.subject-choice:hover, .partner-choice:hover, .case-choice:hover { border-color: var(--accent); transform: translateY(-1px); }
.subject-choice:focus-visible, .partner-choice:focus-visible, .case-choice:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.partner-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.8rem; max-width: 42rem; }
.partner-choice { min-height: 6rem; padding: 1.1rem; border-radius: 13px; font-size: 1.05rem; font-weight: 650; }
.partner-choice span { display: block; margin-top: 0.35rem; color: var(--muted); font-size: 0.8rem; font-weight: 400; }
.selected-path { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; margin: 0 0 1rem; color: var(--muted); font-size: 0.84rem; }
.selected-path strong { color: var(--ink); font-weight: 600; }
.case-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.8rem; }
.case-choice { display: flex; flex-direction: column; min-height: 8.3rem; padding: 1rem; border-radius: 13px; }
.case-choice[aria-pressed="true"] { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--canvas)); }
.case-choice strong { font-size: 1rem; line-height: 1.3; }
.case-choice span { margin-top: 0.55rem; color: var(--muted); font-size: 0.84rem; }
.case-choice small { margin-top: auto; padding-top: 0.8rem; color: var(--accent); font-size: 0.72rem; font-weight: 650; letter-spacing: 0.08em; text-transform: uppercase; }
.case-start { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--hair); }
.case-start p { margin: 0 0 0.85rem; color: var(--muted); font-size: 0.9rem; }
.case-start .primary { min-width: 10rem; }
.challenge-game { max-width: 46rem; margin-inline: auto; }
.challenge-game-head { margin-bottom: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--hair); }
.challenge-game-head .kicker { margin: 0 0 0.35rem; }
.challenge-game-head h2 { font-size: clamp(1.5rem, 4vw, 2.15rem); }
.challenge-meta { margin: 0.45rem 0 0; color: var(--muted); font-size: 0.8rem; }
.challenge-block { margin: 1.1rem 0; }
.challenge-block h3 { margin: 0 0 0.55rem; font-size: 1rem; }
.challenge-story { margin: 0; color: var(--ink); }
.clue-list { display: grid; gap: 0.55rem; }
.clue { margin: 0; padding: 0.8rem 0.9rem; border-left: 2px solid var(--accent); background: color-mix(in srgb, var(--ink) 4%, transparent); color: var(--muted); font-size: 0.9rem; }
.choice-list { display: grid; gap: 0.55rem; }
.answer-choice { display: flex; gap: 0.65rem; align-items: flex-start; padding: 0.8rem 0.9rem; border: 1px solid var(--hair); border-radius: 11px; background: var(--canvas); cursor: pointer; }
.answer-choice:has(input:checked) { border-color: var(--accent); }
.answer-choice input { margin: 0.25rem 0 0; accent-color: var(--accent); }
.answer-choice span { font-size: 0.92rem; }
.reason-field { display: grid; gap: 0.4rem; margin-top: 1rem; }
.reason-field label { font-size: 0.87rem; font-weight: 600; }
.reason-field textarea { width: 100%; min-height: 5.3rem; resize: vertical; border: 1px solid var(--hair); border-radius: 10px; padding: 0.75rem; background: var(--canvas); color: var(--ink); font: inherit; font-size: 0.92rem; }
.reason-field textarea:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.reason-hint, .reason-count { margin: 0; color: var(--muted); font-size: 0.75rem; }
.reason-count { text-align: right; }
.challenge-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.8rem; margin-top: 1.1rem; }
.challenge-actions button.primary { min-width: 10rem; }
.challenge-actions button:disabled { opacity: 0.45; cursor: not-allowed; }
.outcome-card, .debrief-card { margin: 1rem 0; padding: 1rem; border: 1px solid var(--hair); border-radius: 12px; background: var(--canvas); }
.outcome-card p, .debrief-card p { margin: 0; color: var(--muted); }
.lens-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.7rem; margin: 1rem 0; }
.lens { padding: 0.85rem; border-radius: 10px; background: color-mix(in srgb, var(--ink) 4%, transparent); }
.lens strong { display: block; margin-bottom: 0.35rem; font-size: 0.8rem; color: var(--accent); }
.lens p { margin: 0; color: var(--muted); font-size: 0.87rem; }
.challenge-done { margin: 1rem 0; padding: 1rem; border-radius: 12px; background: color-mix(in srgb, var(--accent) 8%, var(--canvas)); }
.challenge-done h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.challenge-done p { margin: 0; color: var(--muted); }
.challenge-disclaimer { margin: 1rem 0 0; color: var(--muted); font-size: 0.78rem; }
.challenge-app button.primary { min-height: 44px; padding-inline: 1.25rem; }
.challenge-app[aria-busy="true"] { opacity: 0.75; }
.challenge-step > p, .challenge-play > .case-setup { color: var(--muted); max-width: 46rem; }
.step-meta { margin: 0 0 0.45rem; color: var(--accent); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.14em; }
.challenge-step > .step-meta { margin-top: 0.9rem; }
.challenge-step > .challenge-back + .challenge-back { margin-left: 1rem; }
.subject-card, .partner-card, .case-card, .choice-card { color: var(--ink); border: 1px solid var(--hair); background: var(--canvas); cursor: pointer; text-align: left; transition: border-color 0.18s, transform 0.18s; }
.subject-card:hover, .partner-card:hover, .case-card:hover, .choice-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.subject-card:focus-visible, .partner-card:focus-visible, .case-card:focus-visible, .choice-card:focus-visible, .challenge-back:focus-visible, .primary-btn:focus-visible, .secondary-btn:focus-visible, .text-btn:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.subject-card { display: flex; justify-content: space-between; align-items: center; min-height: 4rem; padding: 0.8rem 0.9rem; border-radius: 11px; font-weight: 600; }
.partner-card { display: flex; flex-direction: column; justify-content: center; gap: 0.5rem; min-height: 6rem; padding: 1.1rem; border-radius: 13px; font-size: 1.05rem; font-weight: 650; }
.partner-card b { color: var(--accent); }
.card-count { color: var(--muted); font-size: 0.78rem; font-weight: 400; }
.case-card { display: flex; flex-direction: column; align-items: flex-start; gap: 0.55rem; min-height: 10rem; padding: 1rem; border-radius: 13px; }
.case-card > span:not(.case-number) { color: var(--muted); font-size: 0.84rem; }
.case-card strong { font-size: 1rem; line-height: 1.3; }
.case-number { color: var(--accent); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; }
.case-card em { margin-top: auto; color: var(--accent); font-size: 0.8rem; font-style: normal; font-weight: 650; }
.case-pagination { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin: 1rem 0 0.65rem; color: var(--muted); font-size: 0.82rem; }
.case-pagination > div { display: flex; gap: 0.5rem; }
.case-pagination button { min-height: 38px; padding: 0.4rem 0.8rem; border: 1px solid var(--hair); border-radius: 8px; background: var(--canvas); color: var(--ink); cursor: pointer; }
.case-pagination button:hover:not(:disabled) { border-color: var(--accent); }
.case-pagination button:disabled { opacity: 0.45; cursor: not-allowed; }
.challenge-play { max-width: 46rem; margin-inline: auto; }
.challenge-play > .step-meta { margin-top: 1rem; }
.challenge-play h2 { margin-bottom: 0.65rem; }
.clue-box, .feedback-box { margin: 1rem 0; padding: 1rem; border: 1px solid var(--hair); border-radius: 12px; background: var(--canvas); }
.clue-box h3, .question-title, .feedback-box h3 { margin: 0 0 0.6rem; font-size: 1rem; }
.clue-box ul { display: grid; gap: 0.45rem; margin: 0; padding-left: 1.2rem; color: var(--muted); font-size: 0.9rem; }
.question-title { margin-top: 1.3rem; }
.choice-list { margin: 0.7rem 0 1rem; }
.choice-card { display: flex; align-items: flex-start; gap: 0.7rem; width: 100%; padding: 0.85rem 0.9rem; border-radius: 11px; font: inherit; font-size: 0.92rem; }
.choice-card.selected { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--canvas)); }
.choice-radio { flex: 0 0 1rem; height: 1rem; margin-top: 0.2rem; border: 1px solid var(--muted); border-radius: 50%; }
.choice-card.selected .choice-radio { border: 5px solid var(--accent); }
.reason-label { display: block; margin-bottom: 0.4rem; font-size: 0.87rem; font-weight: 600; }
.challenge-play textarea { width: 100%; min-height: 5.5rem; resize: vertical; border: 1px solid var(--hair); border-radius: 10px; padding: 0.75rem; background: var(--canvas); color: var(--ink); font: inherit; font-size: 0.92rem; }
.challenge-play textarea:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.reason-hint, .reason-reminder { margin: 0.35rem 0 0.8rem; color: var(--muted); font-size: 0.76rem; }
.primary-btn, .secondary-btn { min-height: 44px; padding: 0.65rem 1.1rem; border: 1px solid var(--accent); border-radius: 9px; font: inherit; font-weight: 650; cursor: pointer; }
.primary-btn { background: var(--accent); color: var(--canvas); }
.primary-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.secondary-btn { margin-top: 0.8rem; background: transparent; color: var(--ink); }
.text-btn { margin: 0.8rem 0 0 0.8rem; border: 0; background: transparent; color: var(--muted); text-decoration: underline; cursor: pointer; font: inherit; }
.feedback-box > p { color: var(--muted); }
.feedback-box .lens-grid > p { margin: 0; padding: 0.85rem; border-radius: 10px; background: color-mix(in srgb, var(--ink) 4%, transparent); color: var(--muted); font-size: 0.87rem; }
.feedback-box .lens-grid strong { color: var(--accent); }
.feedback-box details { margin-top: 0.8rem; color: var(--muted); font-size: 0.88rem; }
.feedback-box summary { cursor: pointer; color: var(--ink); }
@media (max-width: 48rem) {
  .subject-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 36rem) {
  .challenge-head { padding-top: 2.5rem; }
  .challenge-app { padding: 1rem; border-radius: 14px; }
  .case-grid, .lens-grid, .feedback-box .lens-grid { grid-template-columns: 1fr; }
  .case-pagination { align-items: flex-start; flex-direction: column; }
  .partner-choice { min-height: 5rem; padding: 0.9rem; }
  .challenge-actions > button { width: 100%; }
}

/* Phone layout: use the available width for readable choices and game steps. */
@media (max-width: 40rem) {
  .challenge-head { padding: 2.5rem 0 1rem; }
  .challenge-head .page-title { font-size: clamp(2.15rem, 9vw, 3rem); line-height: 1.08; }
  .challenge-head .sub { margin-top: 0.85rem; font-size: 1.05rem; line-height: 1.5; }
  .challenge-wrap { width: calc(100% - 2rem); padding-bottom: 3rem; }
  .challenge-app { padding: 1rem; }
  .challenge-step-head { align-items: flex-start; margin-bottom: 1rem; }
  .challenge-app h2 { font-size: 1.4rem; line-height: 1.2; }
  .challenge-lead { font-size: 0.98rem; line-height: 1.55; }
  .subject-grid { gap: 0.55rem; }
  .subject-choice { min-height: 3.75rem; padding: 0.7rem; font-size: 0.9rem; }
  .partner-grid { grid-template-columns: 1fr; }
  .partner-choice { min-height: 4.5rem; font-size: 1rem; }
  .case-card { min-height: auto; }
  .case-card > span:not(.case-number) { line-height: 1.5; }
  .challenge-story, .challenge-play > .case-setup { line-height: 1.65; }
  .clue-box, .feedback-box { padding: 0.9rem; }
  .choice-card { padding: 0.9rem; line-height: 1.5; }
  .challenge-actions { gap: 0.6rem; }
  .challenge-actions button { min-height: 48px; }
}

@media (max-width: 22.5rem) {
  .subject-grid { grid-template-columns: 1fr; }
  .challenge-app { padding: 0.85rem; }
}