/* Interactive challenge blocks — blog page only */

.shell-challenge {
  position: relative;
  margin: 1.35rem 0;
  padding: 1.1rem 1.25rem 1.2rem;
  border: 1px solid #2dd4a8;
  border-left: 5px solid #20c997;
  border-radius: 0.55rem;
  background: linear-gradient(145deg, #ecfffa 0%, #f8fffd 45%, #f4fbf8 100%);
  box-shadow:
    0 4px 18px rgba(32, 201, 151, 0.14),
    0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.shell-challenge-label {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #0d9488;
}

.shell-challenge-label::before {
  content: "▶";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 999px;
  background: #20c997;
  color: #fff;
  font-size: 0.55rem;
  line-height: 1;
  letter-spacing: 0;
}

.shell-challenge > p:not(.shell-challenge-label):not(.shell-challenge-goal):not(.shell-challenge-status),
.shell-challenge > ol,
.shell-challenge > ul {
  margin: 0 0 0.85rem;
}

.shell-challenge-goal {
  margin: 0 0 1rem;
}

.shell-challenge-steps {
  margin: 0 0 0.85rem;
  padding-left: 1.25rem;
}

.shell-challenge-steps > li {
  margin: 0 0 1rem;
}

.shell-challenge-steps > li:last-child {
  margin-bottom: 0;
}

.shell-challenge-reveal {
  margin: 0.45rem 0 0;
  border: 1px solid rgba(32, 201, 151, 0.35);
  border-radius: 0.4rem;
  background: rgba(255, 255, 255, 0.55);
}

.shell-challenge-reveal > summary {
  cursor: pointer;
  padding: 0.45rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #0d9488;
  list-style: none;
}

.shell-challenge-reveal > summary::-webkit-details-marker {
  display: none;
}

.shell-challenge-reveal > summary::before {
  content: "▸ ";
}

.shell-challenge-reveal[open] > summary::before {
  content: "▾ ";
}

.shell-challenge-reveal .code-with-filename {
  margin: 0;
  border-top: 1px solid rgba(32, 201, 151, 0.2);
  border-radius: 0 0 0.35rem 0.35rem;
}

.shell-challenge .code-with-filename,
.shell-challenge > div:not(.shell-challenge-actions) .code-with-filename {
  margin: 0.85rem 0;
}

.shell-challenge-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.shell-challenge-start,
.shell-challenge-check {
  border-radius: 0.4rem;
  padding: 0.45rem 0.95rem;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    box-shadow 0.15s ease,
    transform 0.1s ease;
}

.shell-challenge-start {
  border: 1px solid #1aa87e;
  background: linear-gradient(180deg, #2ee4b0 0%, #20c997 100%);
  color: #053d31;
  box-shadow: 0 2px 8px rgba(32, 201, 151, 0.35);
}

.shell-challenge-start:hover {
  background: linear-gradient(180deg, #3aedbc 0%, #22d4a5 100%);
  box-shadow: 0 3px 12px rgba(32, 201, 151, 0.45);
  transform: translateY(-1px);
}

.shell-challenge-start:active {
  transform: translateY(0);
}

.shell-challenge-check {
  border: 1px solid #20c997;
  background: #fff;
  color: #0f766e;
}

.shell-challenge-check:hover:not(:disabled) {
  background: #f0fdf8;
  border-color: #1aa87e;
  box-shadow: 0 2px 8px rgba(32, 201, 151, 0.15);
}

.shell-challenge-check:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  border-color: #adb5bd;
  color: #6c757d;
  background: #f1f3f5;
  box-shadow: none;
}

.shell-challenge-status {
  margin: 0.85rem 0 0;
  padding: 0.65rem 0.85rem;
  border-radius: 0.35rem;
  font-size: 0.88rem;
  color: #495057;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid rgba(32, 201, 151, 0.2);
}

.shell-challenge-status:empty {
  display: none;
}

.shell-challenge-status.is-active {
  color: #0c5460;
  background: #e7f8ff;
  border-color: #9eeaf9;
}

.shell-challenge-status.is-passed {
  color: #0f5132;
  background: #d1e7dd;
  border-color: #a3cfbb;
}

.shell-challenge-status.is-failed {
  color: #842029;
  background: #f8d7da;
  border-color: #f1aeb5;
}

.shell-challenge-status strong {
  display: block;
  margin-bottom: 0.35rem;
}

.shell-challenge-results {
  margin: 0.45rem 0 0;
  padding-left: 1.15rem;
  font-size: 0.84rem;
}

.shell-challenge-results li {
  margin: 0.25rem 0;
}

.shell-challenge-results li.is-passed {
  color: #146c43;
}

.shell-challenge-results li.is-failed {
  color: #b02a37;
}

/* Dark mode (superhero theme) */

body.quarto-dark .shell-challenge {
  border-color: #2dd4a8;
  border-left-color: #20c997;
  background: linear-gradient(145deg, #1a2e28 0%, #212529 50%, #1c2622 100%);
  box-shadow:
    0 4px 22px rgba(0, 0, 0, 0.35),
    0 0 0 1px rgba(45, 212, 168, 0.12) inset;
}

body.quarto-dark .shell-challenge-label {
  color: #5eead4;
}

body.quarto-dark .shell-challenge-reveal {
  background: rgba(0, 0, 0, 0.2);
  border-color: rgba(45, 212, 168, 0.3);
}

body.quarto-dark .shell-challenge-reveal > summary {
  color: #5eead4;
}

body.quarto-dark .shell-challenge-reveal .code-with-filename {
  border-top-color: rgba(45, 212, 168, 0.2);
}

body.quarto-dark .shell-challenge-start {
  color: #042f2e;
}

body.quarto-dark .shell-challenge-check {
  background: #1a2220;
  border-color: #2dd4a8;
  color: #99f6e4;
}

body.quarto-dark .shell-challenge-check:hover:not(:disabled) {
  background: #24302c;
}

body.quarto-dark .shell-challenge-check:disabled {
  background: #2b3035;
  border-color: #495057;
  color: #868e96;
}

body.quarto-dark .shell-challenge-status {
  color: #dee2e6;
  background: rgba(0, 0, 0, 0.25);
  border-color: rgba(45, 212, 168, 0.25);
}

body.quarto-dark .shell-challenge-status.is-active {
  color: #9eeaf9;
  background: rgba(13, 110, 253, 0.15);
  border-color: rgba(13, 202, 240, 0.35);
}

body.quarto-dark .shell-challenge-status.is-passed {
  color: #75b798;
  background: rgba(25, 135, 84, 0.18);
  border-color: rgba(25, 135, 84, 0.45);
}

body.quarto-dark .shell-challenge-status.is-failed {
  color: #ea868f;
  background: rgba(220, 53, 69, 0.18);
  border-color: rgba(220, 53, 69, 0.45);
}

body.quarto-dark .shell-challenge-results li.is-passed {
  color: #75b798;
}

body.quarto-dark .shell-challenge-results li.is-failed {
  color: #ea868f;
}