:root {
  --challenge-blue: #2563eb;
  --challenge-blue-dark: #1d4ed8;
  --challenge-navy: #0f1f4b;
  --challenge-ink: #0f172a;
  --challenge-text: #334155;
  --challenge-muted: #64748b;
  --challenge-line: #dbe4f0;
  --challenge-bg: #f4f7fb;
  --challenge-surface: #ffffff;
  --challenge-green: #15803d;
  --challenge-amber: #d97706;
  --challenge-red: #dc2626;
  --challenge-purple: #7c3aed;
}

[hidden] {
  display: none !important;
}

* {
  box-sizing: border-box;
}

body {
  background: var(--challenge-bg);
  color: var(--challenge-ink);
}

.challenge-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 48px 0 80px;
}

.challenge-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: end;
  margin-bottom: 30px;
}

.challenge-eyebrow,
.panel-label,
.scenario-category {
  display: block;
  color: var(--challenge-blue);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.challenge-hero h1 {
  margin: 10px 0 15px;
  font-size: clamp(2.7rem, 6vw, 4.8rem);
  line-height: 0.96;
  letter-spacing: -0.055em;
}

.challenge-hero h1 span {
  color: var(--challenge-blue);
}

.challenge-hero > div > p {
  max-width: 760px;
  margin: 0;
  color: var(--challenge-muted);
  font-size: 1.12rem;
  line-height: 1.7;
}

.privacy-card {
  display: flex;
  flex-direction: column;
  padding: 19px;
  border: 1px solid #bfdbfe;
  border-radius: 17px;
  background: #eff6ff;
  color: #1e3a8a;
}

.privacy-card strong::before {
  content: "✓";
  display: inline-grid;
  place-items: center;
  width: 23px;
  height: 23px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--challenge-blue);
  color: #ffffff;
}

.privacy-card span {
  margin: 8px 0 0 31px;
  font-size: 0.82rem;
  line-height: 1.55;
}

.challenge-card {
  border: 1px solid var(--challenge-line);
  border-radius: 22px;
  background: var(--challenge-surface);
  box-shadow: 0 14px 38px rgba(15, 31, 75, 0.07);
}

.start-panel {
  max-width: 850px;
  margin: 0 auto 28px;
  padding: 38px;
  text-align: center;
}

.start-icon {
  display: grid;
  place-items: center;
  width: 76px;
  height: 76px;
  margin: 0 auto 18px;
  border-radius: 22px;
  background: linear-gradient(135deg, #dbeafe, #eff6ff);
  font-size: 2.25rem;
}

.start-panel h2 {
  margin: 8px 0 12px;
  font-size: clamp(1.8rem, 4vw, 2.55rem);
  letter-spacing: -0.035em;
}

.start-panel > p {
  max-width: 680px;
  margin: 0 auto;
  color: var(--challenge-muted);
  line-height: 1.7;
}

.simulation-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 28px 0;
  overflow: hidden;
  border: 1px solid var(--challenge-line);
  border-radius: 16px;
  background: #f8fafc;
}

.simulation-details div {
  padding: 18px;
  border-right: 1px solid var(--challenge-line);
}

.simulation-details div:last-child {
  border-right: 0;
}

.simulation-details strong,
.simulation-details span {
  display: block;
}

.simulation-details strong {
  color: var(--challenge-blue);
  font-size: 1.65rem;
}

.simulation-details span {
  margin-top: 3px;
  color: var(--challenge-muted);
  font-size: 0.8rem;
}

.start-list {
  width: min(100%, 620px);
  margin: 0 auto 28px;
  padding: 0;
  list-style: none;
  text-align: left;
}

.start-list li {
  position: relative;
  margin: 11px 0;
  padding-left: 31px;
  color: var(--challenge-text);
}

.start-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 21px;
  height: 21px;
  border-radius: 50%;
  background: #dbeafe;
  color: var(--challenge-blue);
  font-size: 0.76rem;
  font-weight: 900;
}

.challenge-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 18px;
  border: 0;
  border-radius: 11px;
  font: inherit;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease;
}

.challenge-button:hover {
  transform: translateY(-1px);
}

.challenge-button.primary {
  background: var(--challenge-blue);
  color: #ffffff;
}

.challenge-button.primary:hover {
  background: var(--challenge-blue-dark);
}

.challenge-button.secondary {
  border: 1px solid #cbd5e1;
  background: #ffffff;
  color: var(--challenge-text);
}

.challenge-button.large {
  min-height: 52px;
  padding: 14px 25px;
  font-size: 1rem;
}

.simulation-note {
  margin-top: 18px !important;
  font-size: 0.75rem;
}

.game-topbar {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: end;
  margin-bottom: 18px;
}

.game-topbar h2 {
  margin: 4px 0 0;
  font-size: 1.4rem;
}

.progress-wrap {
  width: min(320px, 100%);
  text-align: right;
}

.progress-track {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: #dbe4f0;
}

.progress-fill {
  width: 20%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--challenge-blue), #60a5fa);
  transition: width 0.3s ease;
}

.progress-wrap span {
  display: block;
  margin-top: 6px;
  color: var(--challenge-muted);
  font-size: 0.76rem;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 11px;
  margin-bottom: 18px;
}

.score-card {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 9px;
  align-items: center;
  padding: 15px;
  border: 1px solid var(--challenge-line);
  border-radius: 16px;
  background: #ffffff;
  box-shadow: 0 8px 22px rgba(15, 31, 75, 0.045);
}

.score-icon {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: #eff6ff;
}

.score-card small,
.score-card strong {
  display: block;
}

.score-card small {
  color: var(--challenge-muted);
  font-size: 0.72rem;
}

.score-card strong {
  font-size: 1.25rem;
}

.score-meter {
  grid-column: 1 / -1;
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: #e7edf5;
}

.score-meter span {
  display: block;
  width: 70%;
  height: 100%;
  border-radius: inherit;
  background: var(--challenge-blue);
  transition: width 0.3s ease, background 0.3s ease;
}

.scenario-card {
  padding: 30px;
}

.scenario-heading {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 20px;
}

.scenario-icon {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: linear-gradient(135deg, #dbeafe, #eff6ff);
  font-size: 1.85rem;
}

.scenario-heading h2 {
  margin: 5px 0 0;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  letter-spacing: -0.035em;
}

.scenario-description {
  margin: 0 0 18px;
  color: var(--challenge-text);
  font-size: 1.03rem;
  line-height: 1.72;
}

.scenario-data {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 11px;
  margin-bottom: 26px;
}

.data-point {
  padding: 14px 15px;
  border: 1px solid var(--challenge-line);
  border-radius: 13px;
  background: #f8fafc;
}

.data-point span,
.data-point strong {
  display: block;
}

.data-point span {
  margin-bottom: 4px;
  color: var(--challenge-muted);
  font-size: 0.75rem;
}

.data-point strong {
  color: var(--challenge-navy);
  font-size: 0.95rem;
}

.decision-area {
  padding-top: 24px;
  border-top: 1px solid var(--challenge-line);
}

.decision-area h3 {
  margin: 0 0 14px;
  font-size: 1.1rem;
}

.decision-list {
  display: grid;
  gap: 11px;
}

.decision-option {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 13px;
  align-items: start;
  width: 100%;
  padding: 16px;
  border: 1px solid #cfd9e6;
  border-radius: 14px;
  background: #ffffff;
  color: var(--challenge-text);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.16s ease, background 0.16s ease,
    transform 0.16s ease;
}

.decision-option:hover {
  transform: translateY(-1px);
  border-color: #93b4f5;
  background: #f8fbff;
}

.decision-option:disabled {
  cursor: default;
}

.decision-letter {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: #eff6ff;
  color: var(--challenge-blue);
  font-weight: 900;
}

.decision-option strong,
.decision-option small {
  display: block;
}

.decision-option strong {
  margin-bottom: 4px;
  color: var(--challenge-ink);
}

.decision-option small {
  color: var(--challenge-muted);
  font-size: 0.83rem;
  line-height: 1.55;
}

.decision-option.selected {
  border-color: var(--challenge-blue);
  background: #eff6ff;
}

.feedback-card {
  margin-top: 18px;
  padding: 28px;
  border-left: 5px solid var(--challenge-blue);
}

.feedback-heading {
  margin-bottom: 12px;
}

.feedback-status {
  display: inline-block;
  margin-bottom: 7px;
  padding: 5px 9px;
  border-radius: 999px;
  background: #dbeafe;
  color: #1d4ed8;
  font-size: 0.69rem;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.feedback-status.strong {
  background: #dcfce7;
  color: #166534;
}

.feedback-status.risky {
  background: #fee2e2;
  color: #b91c1c;
}

.feedback-status.mixed {
  background: #ffedd5;
  color: #c2410c;
}

.feedback-heading h2 {
  margin: 0;
  font-size: 1.45rem;
}

.feedback-card > p {
  color: var(--challenge-text);
  line-height: 1.7;
}

.impact-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 22px;
}

.impact-pill {
  padding: 7px 10px;
  border-radius: 999px;
  background: #f1f5f9;
  color: #475569;
  font-size: 0.75rem;
  font-weight: 800;
}

.impact-pill.positive {
  background: #dcfce7;
  color: #166534;
}

.impact-pill.negative {
  background: #fee2e2;
  color: #b91c1c;
}

.impact-pill.neutral {
  background: #e2e8f0;
  color: #475569;
}

.feedback-actions {
  display: flex;
  justify-content: flex-end;
}

.results-panel {
  padding: 36px;
}

.result-header {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  align-items: center;
  margin: 20px 0 28px;
}

.result-score-ring {
  display: grid;
  place-items: center;
  align-content: center;
  width: 128px;
  height: 128px;
  border: 10px solid #dbeafe;
  border-radius: 50%;
  background: #eff6ff;
  color: var(--challenge-navy);
}

.result-score-ring strong {
  font-size: 2.45rem;
  line-height: 1;
}

.result-score-ring span {
  color: var(--challenge-muted);
  font-size: 0.8rem;
}

.result-header h2 {
  margin: 0 0 8px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: -0.04em;
}

.result-header p {
  margin: 0;
  color: var(--challenge-muted);
  line-height: 1.7;
}

.final-score-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  overflow: hidden;
  margin-bottom: 27px;
  border: 1px solid var(--challenge-line);
  border-radius: 16px;
  background: #f8fafc;
}

.final-score-grid div {
  padding: 17px;
  border-right: 1px solid var(--challenge-line);
  text-align: center;
}

.final-score-grid div:last-child {
  border-right: 0;
}

.final-score-grid span,
.final-score-grid strong {
  display: block;
}

.final-score-grid span {
  color: var(--challenge-muted);
  font-size: 0.74rem;
}

.final-score-grid strong {
  margin-top: 4px;
  font-size: 1.35rem;
}

.result-section {
  padding: 24px 0;
  border-top: 1px solid var(--challenge-line);
}

.result-section h3 {
  margin: 0 0 16px;
  font-size: 1.22rem;
}

.decision-summary {
  display: grid;
  gap: 10px;
}

.decision-review-item {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--challenge-line);
  border-radius: 13px;
  background: #f8fafc;
}

.decision-review-item .review-number {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: #dbeafe;
  color: var(--challenge-blue);
  font-weight: 900;
}

.decision-review-item strong,
.decision-review-item small {
  display: block;
}

.decision-review-item small {
  margin-top: 3px;
  color: var(--challenge-muted);
}

.review-rating {
  padding: 5px 8px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 850;
}

.review-rating.strong {
  background: #dcfce7;
  color: #166534;
}

.review-rating.mixed {
  background: #ffedd5;
  color: #c2410c;
}

.review-rating.risky {
  background: #fee2e2;
  color: #b91c1c;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 11px;
}

.resource-grid a {
  display: block;
  padding: 16px;
  border: 1px solid var(--challenge-line);
  border-radius: 13px;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.16s ease, transform 0.16s ease;
}

.resource-grid a:hover {
  transform: translateY(-1px);
  border-color: #93b4f5;
}

.resource-grid strong,
.resource-grid span {
  display: block;
}

.resource-grid strong {
  color: var(--challenge-navy);
}

.resource-grid span {
  margin-top: 5px;
  color: var(--challenge-blue);
  font-size: 0.78rem;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 22px;
  border-top: 1px solid var(--challenge-line);
}

.share-message {
  min-height: 22px;
  margin: 12px 0 0;
  color: var(--challenge-green);
  font-size: 0.82rem;
  font-weight: 750;
}

.about-simulator {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 28px;
  margin-top: 28px;
  padding: 28px;
}

.about-simulator h2 {
  margin: 7px 0 10px;
  font-size: 1.55rem;
}

.about-simulator p {
  margin: 0;
  color: var(--challenge-muted);
  line-height: 1.7;
}

.about-principle {
  padding: 19px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--challenge-navy), #173273);
  color: #ffffff;
}

.about-principle strong {
  display: block;
  margin-bottom: 7px;
}

.about-principle p {
  color: #dbe7ff;
  font-size: 0.88rem;
}

@media (max-width: 950px) {
  .score-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .score-card:nth-child(4),
  .score-card:nth-child(5) {
    grid-column: auto;
  }

  .scenario-data {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 760px) {
  .challenge-shell {
    width: min(100% - 24px, 1180px);
    padding-top: 30px;
  }

  .challenge-hero {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .challenge-hero h1 {
    font-size: 3rem;
  }

  .start-panel,
  .scenario-card,
  .feedback-card,
  .results-panel {
    padding: 21px;
  }

  .simulation-details {
    grid-template-columns: 1fr;
  }

  .simulation-details div {
    border-right: 0;
    border-bottom: 1px solid var(--challenge-line);
  }

  .simulation-details div:last-child {
    border-bottom: 0;
  }

  .game-topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .progress-wrap {
    text-align: left;
  }

  .score-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .score-card:last-child {
    grid-column: 1 / -1;
  }

  .scenario-data {
    grid-template-columns: 1fr;
  }

  .result-header {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .result-score-ring {
    margin: 0 auto;
  }

  .final-score-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .final-score-grid div {
    border-right: 0;
    border-bottom: 1px solid var(--challenge-line);
  }

  .final-score-grid div:last-child {
    grid-column: 1 / -1;
    border-bottom: 0;
  }

  .resource-grid,
  .about-simulator {
    grid-template-columns: 1fr;
  }

  .decision-review-item {
    grid-template-columns: 40px 1fr;
  }

  .review-rating {
    grid-column: 2;
    justify-self: start;
  }

  .feedback-actions,
  .result-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .challenge-button {
    width: 100%;
  }
}

@media (max-width: 430px) {
  .challenge-hero h1 {
    font-size: 2.55rem;
  }

  .score-grid {
    grid-template-columns: 1fr;
  }

  .score-card:last-child {
    grid-column: auto;
  }

  .scenario-heading {
    align-items: flex-start;
  }
}