/* Page-specific additions reuse the site's existing colour and spacing tokens. */
.mutation-skip { position: fixed; top: 8px; left: 8px; z-index: 30; padding: 12px; background: var(--white); transform: translateY(-160%); }
.mutation-skip:focus { transform: none; }
.mutation-hero .wrap { max-width: 1000px; }
.mutation-hero h1 { font-size: clamp(2rem, 4.8vw, 3.8rem); overflow-wrap: anywhere; }
.mutation-hero p { max-width: 720px; }
.mutations-page [hidden] { display: none !important; }
.mutation-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 28px 0 18px; }
.mutation-tabs button { min-height: 76px; padding: 16px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); color: var(--ink); font-weight: 800; cursor: pointer; text-align: left; }
.mutation-tabs button span { display: block; font-size: .78rem; font-weight: 500; margin-top: 7px; }
.mutation-tabs button[aria-selected="true"] { background: var(--soft); border: 2px solid var(--red); padding: 15px; }
.mutation-panel { max-width: 800px; margin-block: 18px; }
.mutation-table { width: 100%; border-collapse: collapse; text-align: left; }
.mutation-table caption { text-align: left; font-size: 1.1rem; font-weight: 800; line-height: 1.6; margin-bottom: 18px; }
.mutation-table caption span { display: inline-block; }
.mutation-table th, .mutation-table td { padding: 12px 10px; border-bottom: 1px solid var(--line); }
.mutation-table thead { background: var(--soft); font-size: .8rem; }
.mutation-table tbody { font-size: 1.1rem; }
.mutation-table tbody th { width: 40%; }
.mutation-change { color: var(--red); font-size: 1.2rem; font-weight: 800; }
/* Keep exact brand red, with a readable size and weight for letter changes. */
.mutation-examples { list-style: none; padding: 0; margin: 18px 0 0; }
.mutation-examples li { padding-block: 14px; border-top: 1px solid var(--line); line-height: 1.6; }
.mutation-examples li > span { display: block; font-size: 1.15rem; font-weight: 600; }
.mutation-examples small { font-size: .8rem; color: var(--muted); }
.mutation-examples small.mutation-change { color: var(--ink); font-weight: 500; }
.mutation-example-grid { align-items: start; }
.mutation-quiz { max-width: 800px; background: var(--soft); }
.mutation-quiz fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
.mutation-quiz legend { font-size: 1.2rem; font-weight: 700; line-height: 1.65; margin-bottom: 20px; }
.quiz-options { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.quiz-options button { min-height: 56px; background: var(--white); border: 1px solid var(--line); border-radius: 12px; padding: 14px 8px; color: var(--ink); font-size: 1.1rem; font-weight: 700; cursor: pointer; overflow-wrap: anywhere; }
.quiz-options button:hover { border-color: var(--green); }
.quiz-options button[aria-pressed="true"] { border: 2px solid var(--red); }
.quiz-options button[data-correct="true"] { border: 2px solid var(--green); }
.quiz-options button[aria-disabled="true"] { cursor: default; }
.quiz-feedback { margin-block: 20px; line-height: 1.8; min-height: 3.6em; }
.quiz-feedback strong { display: block; }
.mutations-page button.btn { cursor: pointer; }
.mutation-reference { margin-top: 28px; align-items: start; }
.mutation-reference .card { padding: 22px; }
@media (max-width: 850px) {
  .mutation-reference { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 580px) {
  .mutation-tabs { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .mutation-tabs button { min-height: 66px; }
  .quiz-options { grid-template-columns: minmax(0, 1fr); }
  .mutation-panel { padding: 18px; }
  .mutation-table th, .mutation-table td { padding-inline: 8px; }
}
@media print {
  @page { margin: 14mm; }
  html, body { background: #fff; color: #222; font-size: 10pt; }
  .mutations-page > :not(main), .mutations-page main > :not(#reference),
  #reference .reference-ui { display: none !important; }
  #reference { padding: 0; border: 0; }
  #reference .wrap { width: 100%; }
  #reference h2 { font-size: 22pt; margin-bottom: 10px; }
  #reference p { line-height: 1.5; color: #222; }
  .mutation-reference { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 18px; }
  .mutation-reference .card { padding: 12px; border-radius: 10px; box-shadow: none; break-inside: avoid; }
  .mutation-table caption { font-size: 11pt; line-height: 1.4; }
  .mutation-table th, .mutation-table td { padding: 7px 3px; font-size: 10pt; }
  .mutation-table tbody th { width: 28%; }
  .mutation-change { color: #222; }
  .mutation-table { break-inside: avoid; }
}

#quiz-next:disabled { opacity: .5; cursor: not-allowed; }

.quiz-context { display: block; margin-top: 12px; }
.quiz-context-translation { display: block; margin: 4px 0 12px; font-size: .9rem; font-weight: 400; color: var(--muted); }

#print-chart { background: var(--white); border: 4px solid var(--green); }