.duplicate-shell {
  width: min(1080px, calc(100% - 32px));
}

.game-heading {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: end;
  padding: 30px 34px;
  border-bottom: 3px solid var(--ink);
}

.game-heading .eyebrow { margin-bottom: 10px; }

.game-heading h1 {
  max-width: 790px;
  font-size: clamp(2.65rem, 7.2vw, 5.5rem);
  line-height: 0.9;
}

.lede {
  max-width: 700px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.round-box {
  min-width: 154px;
  padding: 16px;
  border: 2px solid var(--line);
  background: #171220;
  text-align: center;
}

.round-box > span,
.stat > span {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.round-box strong { color: var(--gold); font-size: 1.6rem; }

.game-card > .mode-panel {
  margin: 0;
  padding: 20px 24px;
  border-bottom: 3px solid var(--ink);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 3px solid var(--ink);
}

.stat {
  min-width: 0;
  padding: 18px 20px;
  border-right: 2px solid var(--line);
  text-align: center;
}

.stat:last-child { border-right: 0; }
.stat strong { color: var(--ink); font-size: clamp(1.05rem, 3vw, 1.65rem); }

.game-stage {
  display: flex;
  min-height: 740px;
  flex-direction: column;
  align-items: center;
  padding: 34px 26px 30px;
  background:
    linear-gradient(rgba(88, 199, 215, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(88, 199, 215, 0.025) 1px, transparent 1px),
    radial-gradient(circle at 50% 41%, #2b223a 0, transparent 55%);
  background-size: 24px 24px, 24px 24px, auto;
}

.stage-copy { min-height: 112px; text-align: center; }
.stage-kicker { margin: 0 0 10px; color: var(--gold); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.14em; }
.stage-copy h2 { margin: 0; font-size: clamp(1.55rem, 4vw, 2.7rem); line-height: 1.05; letter-spacing: -0.04em; }
.stage-copy > p:last-child { max-width: 650px; margin: 12px auto 0; color: var(--muted); font-size: 0.94rem; line-height: 1.5; }

.deadline-track {
  flex: none;
  width: min(620px, 96%);
  height: 12px;
  margin: 5px auto 18px;
  overflow: hidden;
  border: 2px solid #463b50;
  background: #171220;
}

.deadline-fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(1);
  transform-origin: left center;
  background: var(--green);
}

.deadline-fill.is-danger { background: var(--red); }

.symbol-board {
  display: grid;
  width: min(620px, 96%);
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0 auto 18px;
}

.symbol-cell {
  position: relative;
  display: grid;
  min-height: 112px;
  place-items: center;
  border: 3px solid var(--line);
  background: #211a2e;
  box-shadow: 5px 5px 0 var(--shadow);
}

.symbol-cell .cell-number {
  position: absolute;
  top: 8px;
  left: 9px;
  color: #91889d;
  font-size: 0.69rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.symbol-cell .pixel-symbol {
  color: #ded6e4;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(2.35rem, 7vw, 4rem);
  font-weight: 900;
  line-height: 1;
  text-shadow: 3px 3px 0 #0e0b14;
}

.symbol-cell.is-match {
  border-color: var(--green);
  background: #1b3a2a;
}

.symbol-cell.is-match .pixel-symbol { color: #b4ffd0; }

.pair-options {
  display: grid;
  width: min(620px, 96%);
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0 auto 14px;
}

.pair-option {
  display: grid;
  min-width: 0;
  min-height: 96px;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  gap: 4px 10px;
  align-items: center;
  padding: 14px;
  border: 3px solid #5a4e66;
  border-radius: 0;
  background: #171220;
  box-shadow: 5px 5px 0 var(--shadow);
  color: var(--ink);
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 80ms ease, box-shadow 80ms ease, border-color 100ms ease, background 100ms ease;
}

.pair-option:disabled { cursor: default; opacity: 0.58; }
.pair-option:not(:disabled):hover { border-color: var(--gold); background: #2c2438; }
.pair-option:not(:disabled):active,
.pair-option.is-pressed { transform: translate(3px, 3px); box-shadow: 2px 2px 0 var(--shadow); }
.pair-option:focus-visible { outline: 4px solid var(--blue); outline-offset: 3px; }
.pair-option kbd { grid-row: 1 / 3; width: 34px; height: 34px; color: var(--gold); }
.option-label { color: var(--muted); font-size: 0.67rem; font-weight: 800; letter-spacing: 0.08em; }
.option-pair { font-size: clamp(1rem, 3vw, 1.35rem); letter-spacing: 0.04em; }
.pair-option.is-correct { border-color: var(--green); background: #1b3a2a; }
.pair-option.is-wrong { border-color: var(--red); background: #491b29; }

.feedback {
  display: flex;
  min-height: 48px;
  margin: 0 0 15px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.feedback[hidden] { display: none; }
.feedback strong { color: var(--green); font-size: 1.3rem; }
.feedback span { margin-top: 4px; color: var(--muted); font-size: 0.8rem; line-height: 1.4; }

.game-stage[data-state="active"] .primary-button,
.game-stage[data-state="feedback"] .primary-button,
.game-stage[data-state="wrong"] .primary-button,
.game-stage[data-state="timeout"] .primary-button { visibility: hidden; }
.game-stage[data-state="active"] .symbol-board { animation: board-enter 120ms steps(2, end); }
.game-stage[data-state="wrong"],
.game-stage[data-state="timeout"],
.game-stage[data-state="game-over"] { background-color: #351521; }
.game-stage[data-state="complete"] { background-color: #2d2515; }

.control-note { max-width: 720px; margin: 18px 0 0; color: var(--muted); font-size: 0.78rem; line-height: 1.55; text-align: center; }

.content-section { display: grid; grid-template-columns: 0.85fr 1.6fr; gap: 64px; padding: 76px 18px 58px; }
.content-section h2,
.info-panel h2,
.faq-section h2,
.related-section h2 { margin: 0; font-size: clamp(1.8rem, 4vw, 3rem); line-height: 1.08; letter-spacing: -0.05em; }
.steps-list { margin: 0; padding: 0; border-top: 2px solid var(--line); list-style: none; }
.steps-list li { display: grid; grid-template-columns: 54px 1fr; gap: 18px; padding: 20px 0; border-bottom: 2px solid var(--line); }
.steps-list span { color: var(--gold); font-weight: 800; }
.steps-list p,
.info-panel p,
.faq-list p { margin: 0; color: var(--muted); font-size: 1rem; line-height: 1.7; }
.reading-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.info-panel { padding: 30px; border: 2px solid var(--line); background: var(--panel); }
.info-panel h2 { margin-bottom: 22px; }
.info-panel > p:not(.section-kicker) + p { margin-top: 16px; }
.faq-section,
.related-section { padding: 72px 18px 0; }
.faq-list { margin-top: 28px; border-top: 2px solid var(--line); }
.faq-list details { border-bottom: 2px solid var(--line); }
.faq-list summary { padding: 22px 44px 22px 0; color: var(--ink); cursor: pointer; font-size: 1.05rem; font-weight: 800; line-height: 1.4; }
.faq-list details p { max-width: 850px; padding: 0 0 24px; }
.related-links { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-top: 28px; }
.related-links a { display: flex; min-height: 118px; flex-direction: column; justify-content: space-between; padding: 18px; border: 2px solid var(--line); background: var(--panel); color: var(--ink); font-weight: 800; line-height: 1.35; text-decoration: none; }
.related-links a:hover,
.related-links a:focus-visible { border-color: var(--gold); outline: 0; }
.related-links small { color: var(--muted); font-size: 0.76rem; font-weight: 400; }

@keyframes board-enter { from { opacity: 0.72; } to { opacity: 1; } }

@media (max-width: 820px) {
  .game-heading { grid-template-columns: 1fr; }
  .round-box { display: flex; align-items: center; justify-content: space-between; }
  .round-box > span { margin: 0; }
  .related-links { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .duplicate-shell { width: min(100% - 18px, 600px); padding-top: 10px; }
  .game-heading { gap: 20px; padding: 24px 18px; }
  .game-heading h1 { font-size: clamp(2.35rem, 13vw, 3.8rem); }
  .game-card > .mode-panel { padding-inline: 16px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n + 2) { border-bottom: 2px solid var(--line); }
  .game-stage { min-height: 670px; padding: 28px 9px 24px; }
  .stage-copy { min-height: 126px; }
  .symbol-board,
  .pair-options { width: min(430px, calc(100vw - 42px)); gap: 7px; }
  .symbol-cell { min-height: 84px; border-width: 2px; box-shadow: 3px 3px 0 var(--shadow); }
  .pair-option { min-height: 86px; grid-template-columns: 1fr; grid-template-rows: auto auto; gap: 3px; padding: 9px 5px; text-align: center; }
  .pair-option kbd { display: none; }
  .option-pair { font-size: clamp(0.9rem, 4vw, 1.14rem); }
  .content-section,
  .reading-grid { grid-template-columns: 1fr; }
  .content-section { gap: 30px; padding: 58px 8px 44px; }
  .info-panel { padding: 24px 20px; }
  .faq-section,
  .related-section { padding: 58px 8px 0; }
  .related-links { grid-template-columns: 1fr; }
  .related-links a { min-height: 92px; }
}

@media (max-width: 350px) {
  .symbol-board,
  .pair-options { width: calc(100vw - 36px); gap: 5px; }
  .symbol-cell { min-height: 76px; }
  .symbol-cell .pixel-symbol { font-size: 2rem; }
  .pair-option { min-height: 80px; }
  .option-label { font-size: 0.58rem; }
}

@media (prefers-reduced-motion: reduce) {
  .pair-option,
  .deadline-fill { transition: none !important; }
  .game-stage[data-state="active"] .symbol-board { animation: none; }
}