:root {
  --page: #f3f5f8;
  --ink: #1d293d;
  --muted: #69768a;
  --line: #e4e9f0;
  --accent: #315ed5;
  --accent-soft: #edf2ff;
}
* { box-sizing: border-box; }
body.question-page {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.question-page a { color: inherit; text-decoration: none; }
.question-page button { font: inherit; }
.question-page a:focus-visible, .question-page button:focus-visible {
  outline: 3px solid #8da9ff;
  outline-offset: 4px;
}
.question-shell { width: min(1080px, calc(100% - 64px)); margin: 0 auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 32px 0; }
.site-brand { display: inline-flex; align-items: center; gap: 11px; font-size: 18px; font-weight: 700; letter-spacing: -.5px; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--accent); color: white; }
.brand-mark svg { width: 20px; height: 20px; }
.brand-light { color: var(--muted); font-weight: 400; }
.permit-badge { padding: 5px 12px; border: 1px solid #dce3ed; border-radius: 100px; font-size: 12px; font-weight: 600; color: #596780; white-space: nowrap; }
.question-card { padding: 40px; border: 1px solid var(--line); border-radius: 20px; background: white; box-shadow: 0 8px 32px #1d293d04; }
.question-heading { margin-bottom: 32px; }
.eyebrow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0 0 12px; color: var(--muted); font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }
.permalink { display: inline-flex; align-items: center; gap: 6px; min-height: 32px; padding: 4px 9px; border: 1px solid var(--line); border-radius: 7px; background: white; color: #69768a !important; font-size: 12px; font-weight: 500; letter-spacing: 0; text-transform: none; }
.permalink:hover { color: var(--accent) !important; background: #f5f8ff; border-color: #cbd8f8; }
.permalink svg { width: 14px; height: 14px; }
.share-question { display: inline-flex; align-items: center; gap: 6px; min-height: 32px; margin-left: 4px; padding: 4px 9px; border: 1px solid var(--line); border-radius: 7px; background: white; color: #69768a; font-size: 12px !important; font-weight: 500; letter-spacing: 0; text-transform: none; cursor: pointer; }
.share-question svg { width: 14px; height: 14px; }
.share-question:hover { color: var(--accent); background: #f5f8ff; border-color: #cbd8f8; }
.share-question:disabled { cursor: wait; opacity: .6; }
.share-status { color: var(--muted); font-size: 11px; font-weight: 400; letter-spacing: 0; text-transform: none; }
.share-url { width: 100%; margin: 0 0 16px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: #f8fafc; font: inherit; font-size: 13px; }
.share-url[hidden] { display: none; }
.question-title { margin: 0; max-width: 890px; font-size: clamp(23px, 2.4vw, 30px); font-weight: 650; line-height: 1.4; letter-spacing: -.65px; }
.question-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 24px; align-items: center; }
.question-figure { min-width: 0; margin: 0; }
.question-image { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: contain; border: 1px solid var(--line); border-radius: 12px; background: #f8fafc; }
.question-image-frame { position: relative; width: 100%; aspect-ratio: 4 / 3; }
.question-image-frame .question-image { position: absolute; inset: 0; height: 100%; visibility: hidden; }
.question-image-frame.is-ready .question-image { visibility: visible; }
.image-loading { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 12px; border: 1px solid var(--line); border-radius: 12px; background: #f8fafc; color: var(--muted); font-size: 13px; text-align: center; padding: 20px; }
.image-loading[hidden], .image-spinner[hidden] { display: none; }
.image-spinner { width: 22px; height: 22px; border: 2px solid #dfe6f3; border-top-color: var(--accent); border-radius: 50%; animation: image-spin 850ms linear infinite; }
@keyframes image-spin { to { transform: rotate(360deg); } }
.image-placeholder { display: flex; aspect-ratio: 4 / 3; align-items: center; justify-content: center; flex-direction: column; gap: 10px; width: 100%; border: 1px dashed #d8e0eb; border-radius: 12px; background: #f8fafc; color: #8490a3; font-size: 13px; }
.image-placeholder svg { width: 30px; height: 30px; stroke-width: 1.3; color: #a9b5c5; }
.answer-list { display: grid; gap: 10px; min-width: 0; }
.answer-option { display: flex; align-items: center; gap: 14px; width: 100%; min-height: 66px; padding: 14px 18px; border: 1px solid #dfe5ee; border-radius: 12px; background: white; color: var(--ink); text-align: left; line-height: 1.5; cursor: pointer; transition: border-color .15s, background-color .15s, box-shadow .15s; }
.answer-letter { display: grid; place-items: center; flex: 0 0 30px; height: 30px; border: 1px solid #e1e7f0; border-radius: 8px; background: #f5f7fa; color: #718097; font-size: 12px; font-weight: 650; }
.answer-text { min-width: 0; overflow-wrap: anywhere; }
@media (hover: hover) {
  .answer-option:hover { border-color: #9aafe5; background: #f8faff; box-shadow: 0 0 0 1px #315ed510; }
  .next-question:hover { background: #274eb5; color: white; }
  .explanation-toggle:not(:disabled):hover { background: var(--accent-soft); border-color: #bbcaf0; }
}
.answer-option.is-correct { border-color: #6bb69a; background: #edf8f2; color: #196245; }
.answer-option.is-correct .answer-letter { background: #d9f0e3; border-color: #b4dbc7; color: #196245; }
.answer-option.is-incorrect { border-color: #df9f9f; background: #fff3f2; color: #9d3939; }
.answer-option.is-incorrect .answer-letter { background: #fbe0de; border-color: #efc1bf; color: #9d3939; }
.answer-result { display: grid; place-items: center; flex: 0 0 20px; width: 20px; height: 20px; margin-left: auto; opacity: 0; }
.answer-result svg { display: none; width: 20px; height: 20px; }
.is-correct .answer-result, .is-incorrect .answer-result { opacity: 1; }
.is-correct .result-check, .is-incorrect .result-cross { display: block; }
.answer-option.feedback-correct { animation: answer-success 420ms ease-out; }
.answer-option.feedback-incorrect { animation: answer-shake 340ms ease-in-out; }
.feedback-correct .answer-result, .feedback-incorrect .answer-result { animation: result-appear 260ms ease-out; }
@keyframes answer-success {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 #6bb69a00; }
  40% { transform: scale(1.012); box-shadow: 0 0 0 5px #6bb69a22; }
}
@keyframes answer-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}
@keyframes result-appear {
  0% { opacity: 0; transform: scale(.55); }
  65% { opacity: 1; transform: scale(1.16); }
  100% { opacity: 1; transform: scale(1); }
}
.answer-feedback { margin: 2px 0 0; min-height: 20px; font-size: 12px; color: var(--muted); }
.answer-feedback[data-state="correct"] { color: #196245; }
.answer-feedback[data-state="incorrect"] { color: #9d3939; }
.explanation-section { margin-top: 28px; padding-top: 24px; border-top: 1px solid #edf0f5; }
.explanation-toggle { display: inline-flex; align-items: center; gap: 8px; padding: 9px 14px; border: 1px solid #d8e2f7; border-radius: 9px; background: #f5f8ff; color: var(--accent); font-size: 13px !important; font-weight: 600 !important; cursor: pointer; }
.explanation-toggle svg { width: 16px; height: 16px; }
.explanation-toggle:disabled { color: #8993a3; background: #f7f8fa; border-color: #e7ebf0; cursor: not-allowed; }
.explanation-toggle .chevron { transition: transform .15s; }
.explanation-toggle[aria-expanded="true"] .chevron { transform: rotate(180deg); }
.explanation-hint { display: inline-block; margin-left: 12px; font-size: 12px; color: #7b8799; }
.explanation-content { margin-top: 18px; padding: 20px 22px; border-radius: 12px; background: #f5f8fd; font-size: 15px; line-height: 1.8; overflow-wrap: anywhere; }
.explanation-content img { display: block; max-width: 100%; height: auto; margin-top: 14px; border-radius: 8px; }
.explanation-content[hidden] { display: none; }
.question-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 24px 0 32px; }
.back-link { color: var(--muted) !important; font-size: 13px; }
.back-link:hover { color: var(--accent) !important; }
.next-question { display: inline-flex; align-items: center; justify-content: center; gap: 12px; padding: 12px 20px; border-radius: 10px; background: var(--accent); color: white !important; font-size: 14px; font-weight: 600; transition: background .15s; }
.next-question svg { width: 17px; height: 17px; }
.community { margin: 0 0 32px; padding-top: 20px; border-top: 1px solid var(--line); }
.community-title { margin: 0 0 12px; font-size: 13px; font-weight: 500; color: var(--muted); }
.dev-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.dev-actions a { padding: 6px 10px; border: 1px solid var(--line); border-radius: 6px; font-size: 12px; cursor: pointer; }
@media (min-width: 992px) {
  .question-layout { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 32px; }
}
@media (max-width: 599px) {
  .question-shell { width: calc(100% - 28px); }
  .site-header { padding: 22px 2px; }
  .site-brand { font-size: 16px; gap: 9px; }
  .brand-mark { width: 30px; height: 30px; border-radius: 9px; }
  .permit-badge { padding: 4px 9px; font-size: 11px; }
  .question-card { padding: 23px 18px; border-radius: 16px; }
  .question-heading { margin-bottom: 24px; }
  .question-title { font-size: 23px; letter-spacing: -.5px; }
  .answer-option { padding: 13px 12px; gap: 11px; font-size: 15px; }
  .answer-letter { flex-basis: 28px; height: 28px; }
  .question-footer { align-items: stretch; flex-direction: column-reverse; gap: 18px; padding-top: 20px; text-align: center; }
  .next-question { padding: 14px 20px; }
  .explanation-hint { display: block; margin: 9px 0 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}