/* "What is your challenge?" explorer (homepage). Quiet Boardroom rules: square corners,
   hairlines, one night panel for the prompt box. */
.challenge-section { background: var(--paper-2); }
.challenge-inner { max-width: 880px; margin-inline: auto; padding-inline: var(--gutter); text-align: center; }
.challenge-inner .eyebrow { justify-content: center; }
.challenge-inner h2 { margin: 0; font-size: var(--h2); font-weight: 300; }
.challenge-lede { max-width: 60ch; margin: 18px auto 0; color: var(--ink-soft); font-size: var(--lede); line-height: 1.6; }

/* Prompt box: shown only with JavaScript; without it the chips link to the library. */
.challenge-form { display: none; }
.challenge-section.is-live .challenge-form {
  display: flex; align-items: flex-end; gap: 12px; margin-block-start: 36px; padding: 18px;
  background: var(--night); border: 1px solid var(--night); text-align: start;
  transition: border-color var(--t-base) var(--ease-out), box-shadow var(--t-base) var(--ease-out);
}
.challenge-section.is-live .challenge-form:focus-within { border-color: var(--gold-lum); box-shadow: 0 0 0 1px var(--gold-lum); }
.challenge-field { flex: 1; min-width: 0; }
.challenge-hint { margin: 0 4px 4px; color: var(--on-night-soft); font-size: 0.9rem; }
.challenge-form textarea {
  width: 100%; min-height: 56px; padding: 6px 4px; border: 0; background: transparent; resize: none;
  color: var(--on-night); font: inherit; font-size: 1.1rem; line-height: 1.5;
}
.challenge-form textarea:focus { outline: none; }
.challenge-submit {
  flex: 0 0 auto; display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 0 22px;
  border: 0; background: var(--gold-lum); color: var(--night); font: inherit; font-weight: 500; cursor: pointer;
  transition: background-color var(--t-fast);
}
.challenge-submit:hover { background: var(--paper); }
.challenge-submit:focus-visible { outline: 2px solid var(--paper); outline-offset: 2px; }

.challenge-chips-label { margin: 28px 0 12px; color: var(--muted); font-size: 0.9rem; }
.challenge-chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin: 0; padding: 0; list-style: none; }
.challenge-chip {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 18px;
  border: 1px solid var(--line-strong); color: var(--ink); font-size: 0.95rem;
  transition: border-color var(--t-fast), background-color var(--t-fast);
}
.challenge-chip:hover { border-color: var(--gold); background: var(--paper); }

.challenge-result:empty { display: none; }
.challenge-card { margin-block-start: 32px; padding: clamp(24px, 4vw, 40px); background: var(--paper); border: 1px solid var(--line); border-block-start: 2px solid var(--gold); text-align: start; }
html.js .challenge-card { animation: challenge-in 0.6s var(--ease-out); }
@keyframes challenge-in { from { opacity: 0.25; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.challenge-card-eyebrow { margin: 0 0 8px; color: var(--gold-text); font-size: 0.85rem; font-weight: 500; }
.challenge-card h3 { margin: 0 0 18px; font-size: clamp(1.4rem, 2.2vw, 1.8rem); font-weight: 400; }
.challenge-card dl { display: grid; grid-template-columns: max-content 1fr; gap: 12px 24px; margin: 0; }
.challenge-card dt { color: var(--muted); font-size: 0.9rem; padding-block-start: 2px; }
.challenge-card dd { margin: 0; line-height: 1.65; }
.challenge-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px 28px; margin-block-start: 26px; }
.challenge-related { margin-block-start: 26px; padding-block-start: 18px; border-block-start: 1px solid var(--line); }
.challenge-related p { margin: 0 0 10px; color: var(--muted); font-size: 0.9rem; }
.challenge-related button { margin-inline-end: 10px; margin-block-end: 8px; min-height: 44px; padding: 0 14px; border: 1px solid var(--line-strong); background: transparent; color: var(--ink); font: inherit; font-size: 0.92rem; cursor: pointer; }
.challenge-related button:hover { border-color: var(--gold); }
.challenge-card.is-empty p { margin: 0 0 20px; font-size: 1.1rem; }
.challenge-note { margin: 24px auto 0; max-width: 60ch; color: var(--muted); font-size: 0.85rem; }

@media (max-width: 600px) {
  .challenge-section.is-live .challenge-form { flex-direction: column; align-items: stretch; }
  .challenge-submit { justify-content: center; }
  .challenge-card dl { grid-template-columns: 1fr; gap: 4px; }
  .challenge-card dd { margin-block-end: 12px; }
}
@media (prefers-reduced-motion: reduce) { html.js .challenge-card { animation: none; } }
html.a11y-reduced-motion .challenge-card { animation: none !important; }