* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; padding: 24px 16px; background: #f4f7f6; color: #333; font: 16px/1.7 "Microsoft YaHei", "PingFang SC", Arial, sans-serif; }
.container { max-width: 1080px; margin: 0 auto; padding: 28px 32px; background: #fff; border: 1px solid #ddd; border-radius: 8px; }
header { text-align: center; margin-bottom: 28px; }
h1 { margin: 0; color: #2c3e50; font-size: 27px; }
.subtitle { margin: 2px 0 0; font-size: 13px; color: #777; letter-spacing: .02em; }
h2 { margin: 0 0 12px; font-size: 21px; color: #2c3e50; }
h3 { margin: 0 0 6px; font-size: 18px; }
p { margin: 10px 0; }
button { font: inherit; }
select { font: inherit; padding: 8px 10px; border: 1px solid #bbb; border-radius: 4px; background: white; color: #333; }
button { border: 1px solid #3498db; border-radius: 4px; padding: 8px 22px; background: #3498db; color: #fff; cursor: pointer; }
button:hover { background: #2980b9; }
button:disabled { cursor: default; opacity: .6; }
button:disabled:hover { background: #3498db; }
.secondary { background: #fff; color: #27638c; border-color: #bbcbd6; }
.secondary:hover { background: #edf4f8; }
:focus-visible { outline: 3px solid #2476ad; outline-offset: 3px; }
a { color: #2476ad; }
.muted { color: #6b7278; font-size: 14px; }
#intro { max-width: 760px; margin: 0 auto; }
.difficulty-path { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid #dce2e6; border-radius: 4px; margin-top: 22px; background: #fafbfc; text-align: center; font-size: 14px; }
.difficulty-path span { padding: 10px 4px; }
.difficulty-path span + span { border-left: 1px solid #dce2e6; }
.difficulty-path b { display: block; font-weight: normal; color: #777; font-size: 12px; }
.start-controls { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-top: 24px; }
body.game-active { overflow: hidden; }
body.game-active .container > header, body.game-active .data-note, body.game-active footer { display: none; }
#game { position: fixed; inset: 0; z-index: 20; width: 100%; max-width: 1080px; margin-inline: auto; height: 100vh; height: 100dvh; display: grid; grid-template-rows: auto minmax(0, 1fr) auto; background: #fff; }
.game-scroll { overflow-y: auto; overscroll-behavior-y: contain; min-height: 0; padding: 20px 32px 24px; }
.scoreboard { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 32px; border-bottom: 1px solid #e0e4e6; background: #fff; z-index: 1; }
.scoreboard b { font-size: 23px; margin-left: 6px; color: #2c3e50; }
.lives { display: inline-flex; gap: 3px; color: #b94a48; font-size: 23px; }
.heart { position: relative; display: inline-block; width: 1em; text-align: center; }
.heart-fragment { display: none; position: absolute; inset: 0; color: #b94a48; pointer-events: none; }
.heart-fragment.left { clip-path: polygon(0 0, 55% 0, 43% 35%, 58% 53%, 45% 73%, 50% 100%, 0 100%); }
.heart-fragment.right { clip-path: polygon(55% 0, 100% 0, 100% 100%, 50% 100%, 45% 73%, 58% 53%, 43% 35%); }
.mobile-actions { display: flex; align-items: center; gap: 16px; padding: 12px 32px; border-top: 1px solid #dce2e6; background: #fff; }
#mobile-action-status { flex: 1; min-width: 0; font-size: 14px; color: #52616c; }
#mobile-next { min-width: 200px; min-height: 46px; font-size: 17px; font-weight: bold; }
.lost { color: #d8dcde; }
.round-heading { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.round-heading h2 { margin: 0; }
.tag { padding: 2px 9px; background: #edf3f7; border-radius: 4px; font-size: 13px; color: #376381; }
.count-hints { margin: 16px 0 12px; padding: 10px 14px; background: #f5f8fa; border-radius: 4px; }
.count-hints-title { display: block; color: #6b7278; font-size: 13px; }
.count-hints-values { display: flex; flex-wrap: wrap; gap: 6px 20px; margin-top: 4px; color: #445460; font-size: 18px; font-weight: bold; font-variant-numeric: tabular-nums; }
.options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 18px 0; }
.option { border: 1px solid #ced6dc; border-radius: 5px; padding: 14px; min-width: 0; display: flex; flex-direction: column; background: #fff; }
.option-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.option-label { font-size: 17px; font-weight: bold; color: #445460; }
.answer-count { font-size: 17px; font-weight: bold; font-variant-numeric: tabular-nums; color: #52616c; }
.card-row { display: grid; grid-template-columns: repeat(var(--cards), minmax(0, 1fr)); gap: 8px; flex: 1; align-content: start; }
.card-tile { min-width: 0; position: relative; text-align: center; }
.card-image-button { display: block; position: relative; width: 100%; max-width: 155px; margin-inline: auto; padding: 0; border: 0; background: #f2f3f5; border-radius: 4px; overflow: hidden; }
.card-image-button:hover { background: #e8edf1; }
.card-image { display: block; width: 100%; aspect-ratio: 536 / 698; object-fit: contain; font-size: 12px; }
.card-quantity { position: absolute; bottom: 5px; right: 5px; padding: 0 7px; background: #283c4d; color: #fff; border: 1px solid #fff; border-radius: 3px; font-size: 15px; font-weight: bold; line-height: 1.65; }
.card-name { font-size: 12px; line-height: 1.55; margin: 6px 0 10px; overflow-wrap: anywhere; }
.choose { display: block; width: 100%; margin-top: 8px; }
.option.correct { border: 2px solid #458b64; padding: 13px; background: #f4faf6; }
.option.wrong { border: 2px solid #b86b66; padding: 13px; background: #fcf6f5; }
.option.correct .answer-count { color: #287548; }
.option.wrong .answer-count { color: #a34a43; }
.answer-label { margin-top: 7px; text-align: center; font-size: 14px; font-weight: bold; min-height: 24px; }
.option.correct .answer-label { color: #287548; }
.option.wrong .answer-label { color: #a34a43; }
.deck-examples { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 8px; border-top: 1px solid #dce2e6; padding-top: 9px; margin-top: 9px; font-size: 14px; }
.deck-example-links { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.deck-example-links a { padding-block: 3px; text-underline-offset: 3px; }
#summary { text-align: center; padding: 10px 0; }
.final-score { color: #27638c; }
.final-score b { font-size: 52px; line-height: 1.2; }
.actions { display: flex; justify-content: center; gap: 12px; margin: 22px 0; }
details { font-size: 13px; color: #666; }
summary { cursor: pointer; color: #48545d; }
.data-note { border-top: 1px solid #ddd; margin-top: 30px; padding-top: 16px; }
footer { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 22px; font-size: 13px; color: #888; }
.error { color: #a13d36; background: #fff3f1; padding: 14px; border-radius: 4px; }
#history { text-align: left; margin-top: 22px; }
.history-item { border-bottom: 1px solid #e2e5e8; padding: 12px 0; }
.history-item p { margin: 4px 0; }
.history-wrong { color: #a34a43; }
dialog { max-width: 530px; width: calc(100% - 28px); max-height: 92vh; overflow: auto; border: 1px solid #c6d0d7; border-radius: 6px; padding: 22px; color: #333; }
dialog::backdrop { background: rgba(20, 30, 40, .5); }
.close-dialog { float: right; padding: 5px 13px; margin-left: 12px; }
dialog h2 { font-size: 18px; padding-top: 5px; }
#dialog-image { display: block; width: min(100%, 310px); margin: 14px auto; }
#dialog-text { white-space: pre-wrap; font-size: 14px; }
@media (min-width: 850px) { .options.many { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 600px) {
  body { padding: 12px 8px; }
  .container { padding: 20px 14px; }
  h1 { font-size: 23px; }
  h2 { font-size: 19px; }
  .game-scroll { padding: 12px max(10px, env(safe-area-inset-right)) 16px max(10px, env(safe-area-inset-left)); }
  .options { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 12px 0; }
  .option { padding: 8px; }
  .option.correct, .option.wrong { padding: 7px; }
  .option-head { gap: 4px; margin-bottom: 6px; align-items: baseline; flex-wrap: wrap; }
  .option-label, .answer-count { font-size: 13px; }
  .card-row { width: 100%; gap: 4px; }
  .card-image-button { max-width: 95px; }
  .card-name { font-size: 11px; line-height: 1.4; margin: 4px 0 6px; }
  .card-quantity { font-size: 11px; right: 2px; bottom: 2px; padding: 0 3px; }
  .choose { font-size: 14px; padding: 6px; min-height: 40px; margin-top: 6px; }
  .scoreboard { align-items: center; margin: 0; border-top: 0; padding: max(10px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) 10px max(12px, env(safe-area-inset-left)); font-size: 13px; gap: 8px; background: #fff; z-index: 1; }
  .scoreboard b { font-size: 19px; margin-left: 3px; }
  .lives { font-size: 21px; gap: 1px; white-space: nowrap; }
  .mobile-actions { display: flex; align-items: center; gap: 10px; padding: 10px max(12px, env(safe-area-inset-right)) max(10px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left)); border-top: 1px solid #dce2e6; background: #fff; }
  #mobile-action-status { flex: 1; min-width: 0; font-size: 12px; line-height: 1.5; color: #52616c; }
  #mobile-next { min-height: 44px; min-width: 134px; padding: 8px 12px; font-size: 15px; }
  .mobile-actions { flex-direction: column; gap: 6px; }
  #mobile-action-status { flex: none; text-align: center; }
  #mobile-next { width: 100%; min-height: 48px; font-size: 17px; font-weight: bold; }
  #round-hint { font-size: 12px; margin: 6px 0; }
  .count-hints { margin: 10px 0; padding: 7px 10px; }
  .count-hints-title { font-size: 11px; }
  .count-hints-values { gap: 4px 14px; font-size: 16px; }
  .answer-label, .deck-examples { font-size: 12px; }
  .deck-example-links { gap: 2px 10px; }
  .round-heading { gap: 6px 10px; }
  .start-controls { gap: 10px; }
  .start-controls button { flex: 1; }
  footer { gap: 8px 15px; }
}
@media (prefers-reduced-motion: no-preference) {
  button { transition: background .12s; }
  .heart.breaking .heart-fragment { display: block; animation: heart-break-left .65s ease-out both; }
  .heart.breaking .heart-fragment.right { animation-name: heart-break-right; }
}
@keyframes heart-break-left { 0% { transform: translate(0, 0) rotate(0); opacity: 1; } 30% { transform: translate(-3px, -4px) rotate(-12deg); opacity: 1; } 100% { transform: translate(-9px, 12px) rotate(-30deg); opacity: 0; } }
@keyframes heart-break-right { 0% { transform: translate(0, 0) rotate(0); opacity: 1; } 30% { transform: translate(3px, -4px) rotate(12deg); opacity: 1; } 100% { transform: translate(9px, 12px) rotate(30deg); opacity: 0; } }