.cac-page-shell {
  --cac-bg: #eef3f8;
  --cac-panel: #18344d;
  --cac-panel-alt: #223f59;
  --cac-panel-soft: #274764;
  --cac-ink: #f5f9fd;
  --cac-muted: #bfd0df;
  --cac-line: rgba(214, 228, 240, 0.14);
  --cac-accent: #2e5577;
  --cac-accent-strong: #dbe8f4;
  --cac-danger: #ffd6d6;
  --cac-danger-soft: rgba(142, 32, 45, 0.28);
  --cac-success: #d8ffe7;
  --cac-success-soft: rgba(20, 112, 74, 0.34);
  --cac-shadow: 0 30px 70px rgba(10, 24, 39, 0.16);
  color: var(--cac-ink);
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 20px 56px;
}

.cac-hero {
  background:
    radial-gradient(circle at top left, rgba(102, 150, 191, 0.14), transparent 34%),
    radial-gradient(circle at right center, rgba(58, 106, 146, 0.16), transparent 30%),
    var(--cac-panel);
  border: 1px solid var(--cac-line);
  border-radius: 28px;
  box-shadow: var(--cac-shadow);
  padding: 32px;
}

.cac-page-title {
  color: var(--cac-ink);
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
  margin: 0;
}

.cac-page-subtitle {
  color: var(--cac-accent-strong);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 600;
  margin: 14px 0 10px;
}

.cac-page-intro {
  color: var(--cac-muted);
  font-size: 1rem;
  line-height: 1.7;
  margin: 0;
  max-width: 780px;
}

.cac-layout {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
  margin-top: 28px;
}

.cac-stats-card,
.cac-challenge-card,
.cac-supporting-copy {
  background: var(--cac-panel);
  border: 1px solid var(--cac-line);
  border-radius: 28px;
  box-shadow: var(--cac-shadow);
}

.cac-stats-card {
  align-self: start;
  padding: 24px;
  position: sticky;
  top: 24px;
}

.cac-stats-card h2,
.cac-supporting-copy h2 {
  color: var(--cac-ink);
  font-size: 1.1rem;
  margin: 0 0 18px;
}

.cac-stats {
  display: grid;
  gap: 14px;
}

.cac-stat {
  background: var(--cac-panel-alt);
  border-radius: 18px;
  border: 1px solid var(--cac-line);
  padding: 16px;
}

.cac-stat-label {
  color: var(--cac-muted);
  display: block;
  font-size: 0.92rem;
  margin-bottom: 6px;
}

.cac-stat strong {
  font-size: 1.6rem;
}

.cac-challenge-card {
  padding: 28px;
}

.cac-question-kicker {
  color: var(--cac-accent-strong);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin: 0 0 10px;
  text-transform: uppercase;
}

.cac-question {
  color: var(--cac-ink);
  font-size: clamp(1.5rem, 3vw, 2.35rem);
  line-height: 1.15;
  margin: 0;
}

.cac-meta {
  color: var(--cac-muted);
  font-size: 0.95rem;
  margin-top: 10px;
  min-height: 1.3em;
}

.cac-options {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.cac-option {
  appearance: none;
  background: linear-gradient(180deg, var(--cac-panel-soft) 0%, var(--cac-panel-alt) 100%);
  border: 1px solid var(--cac-line);
  border-radius: 18px;
  color: var(--cac-ink);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  padding: 18px 20px;
  text-align: left;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
  width: 100%;
}

.cac-option:hover,
.cac-option:focus-visible {
  border-color: rgba(219, 232, 244, 0.26);
  box-shadow: 0 12px 30px rgba(8, 20, 34, 0.24);
  outline: none;
  transform: translateY(-2px);
}

.cac-option:disabled {
  cursor: default;
  opacity: 1;
  transform: none;
}

.cac-option.is-correct {
  background: var(--cac-success-soft);
  border-color: rgba(118, 231, 173, 0.34);
  color: var(--cac-success);
}

.cac-option.is-incorrect {
  background: var(--cac-danger-soft);
  border-color: rgba(255, 170, 170, 0.28);
  color: var(--cac-danger);
}

.cac-feedback {
  border-radius: 22px;
  margin-top: 24px;
  padding: 20px;
}

.cac-feedback p {
  margin: 0 0 10px;
}

.cac-feedback p:last-child {
  margin-bottom: 0;
}

.cac-feedback-status {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cac-feedback-correct {
  background: var(--cac-success-soft);
  border: 1px solid rgba(118, 231, 173, 0.24);
}

.cac-feedback-incorrect {
  background: var(--cac-danger-soft);
  border: 1px solid rgba(255, 170, 170, 0.22);
}

.cac-feedback-neutral {
  background: var(--cac-panel-alt);
  border: 1px solid var(--cac-line);
}

.cac-reset-note {
  color: var(--cac-accent-strong);
  font-weight: 600;
}

.cac-actions {
  margin-top: 22px;
}

.cac-next-button {
  appearance: none;
  background: linear-gradient(135deg, #2b5273 0%, #406588 100%);
  border: 0;
  border-radius: 999px;
  box-shadow: 0 16px 32px rgba(8, 20, 34, 0.28);
  color: #ffffff;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  padding: 14px 24px;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.cac-next-button:hover,
.cac-next-button:focus-visible {
  box-shadow: 0 20px 40px rgba(8, 20, 34, 0.34);
  outline: none;
  transform: translateY(-1px);
}

.cac-supporting-copy {
  margin-top: 28px;
  padding: 28px;
}

.cac-supporting-copy p {
  color: var(--cac-muted);
  line-height: 1.8;
  margin: 0;
  max-width: 760px;
}

@media (max-width: 820px) {
  .cac-layout {
    grid-template-columns: 1fr;
  }

  .cac-stats-card {
    position: static;
  }
}

@media (max-width: 640px) {
  .cac-page-shell {
    padding: 18px 14px 40px;
  }

  .cac-hero,
  .cac-challenge-card,
  .cac-stats-card,
  .cac-supporting-copy {
    border-radius: 22px;
    padding: 20px;
  }

  .cac-option {
    font-size: 0.98rem;
    padding: 16px;
  }

  .cac-next-button {
    width: 100%;
  }
}