.simple-shell {
  width: min(1060px, calc(100% - 32px));
}

.test-card {
  overflow: hidden;
  border: 3px solid var(--ink);
  background: var(--panel);
  box-shadow: 10px 10px 0 var(--shadow);
}

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

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

.test-heading h1 {
  max-width: 760px;
  font-size: clamp(2.35rem, 7vw, 5rem);
  line-height: 0.94;
}

.lede {
  max-width: 650px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.progress-box {
  min-width: 168px;
  padding: 16px;
  border: 2px solid var(--line);
  background: #171220;
  text-align: center;
}

.progress-box > span,
.stat > span {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

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

.test-card > .mode-panel {
  margin: 0;
  padding: 22px 24px;
  border-bottom: 3px solid var(--ink);
  background: #16111f;
}

.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(1.08rem, 3vw, 1.7rem);
}

.test-stage {
  display: flex;
  min-height: 590px;
  flex-direction: column;
  align-items: center;
  padding: 40px 34px 32px;
  background:
    linear-gradient(rgba(247, 201, 72, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(247, 201, 72, 0.025) 1px, transparent 1px),
    radial-gradient(circle at 50% 42%, #2a2039 0, transparent 55%);
  background-size: 24px 24px, 24px 24px, auto;
  transition: background-color 120ms ease;
}

.test-stage .status-copy {
  width: 100%;
  max-width: 680px;
  min-height: 130px;
  margin: 0;
  text-align: center;
}

.stage-kicker {
  margin: 0 0 10px;
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.status-copy h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(1.6rem, 4vw, 2.8rem);
  letter-spacing: -0.04em;
}

.status-copy > p:last-child {
  max-width: 620px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.55;
}

.signal-pad {
  display: flex;
  width: min(700px, 100%);
  min-height: 270px;
  flex-direction: column;
  gap: 13px;
  align-items: center;
  justify-content: center;
  padding: 26px;
  border: 4px solid var(--ink);
  border-radius: 0;
  background: #211a2e;
  box-shadow: 8px 8px 0 var(--shadow);
  color: var(--ink);
  cursor: pointer;
  touch-action: manipulation;
  transition: background 100ms ease, box-shadow 80ms ease, transform 80ms ease;
  user-select: none;
}

.signal-pad:active {
  transform: translate(4px, 4px);
  box-shadow: 4px 4px 0 var(--shadow);
}

.signal-pad:focus-visible,
.related-links a:focus-visible,
.faq-list summary:focus-visible {
  outline: 4px solid var(--blue);
  outline-offset: 4px;
}

.signal-core {
  display: grid;
  width: 112px;
  height: 112px;
  place-items: center;
  border: 4px solid #554967;
  background: #30273d;
  box-shadow: inset 0 0 0 7px #17121f;
  color: #786d87;
  font-size: 3.5rem;
  line-height: 1;
}

.signal-action {
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.signal-keys {
  display: flex;
  gap: 8px;
}

.signal-keys kbd {
  width: auto;
  min-width: 74px;
  padding: 0 8px;
  color: var(--muted);
  font-size: 0.72rem;
}

.test-stage > .deadline-track {
  margin: 18px auto 0;
}

.test-stage .primary-button {
  margin-top: 24px;
}

.control-note {
  max-width: 700px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
  text-align: center;
}

.test-stage[data-state="waiting"] .primary-button,
.test-stage[data-state="signal"] .primary-button,
.test-stage[data-mode="endless"][data-state="result"] .primary-button {
  visibility: hidden;
}

.test-stage[data-state="waiting"] .signal-core {
  animation: waiting-pulse 900ms steps(2, end) infinite;
}

.test-stage[data-state="signal"] {
  background-color: #123720;
}

.test-stage[data-state="signal"] .signal-pad {
  border-color: #b9ffd0;
  background: var(--green);
  box-shadow: 8px 8px 0 #071a0d, 0 0 40px rgba(83, 221, 131, 0.28);
  color: #082313;
}

.test-stage[data-state="signal"] .signal-core {
  border-color: #082313;
  background: #b9ffd0;
  box-shadow: inset 0 0 0 7px #4fce7b;
  color: #082313;
  transform: scale(1.08);
}

.test-stage[data-state="signal"] .signal-keys kbd {
  border-color: #287846;
  background: #8bf2ad;
  color: #082313;
}

.test-stage[data-state="false-start"],
.test-stage[data-state="game-over"] {
  background-color: #351521;
}

.test-stage[data-state="complete"] {
  background-color: #2d2515;
}

.test-stage[data-state="result"] {
  background-color: #153244;
}

.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);
}

.related-links small {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 400;
}

@keyframes waiting-pulse {
  0%, 49% { border-color: #554967; color: #786d87; }
  50%, 100% { border-color: var(--gold); color: var(--gold); }
}

@media (max-width: 820px) {
  .test-heading {
    grid-template-columns: 1fr;
  }

  .progress-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .progress-box > span {
    margin: 0;
  }

  .related-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .simple-shell {
    width: min(100% - 18px, 600px);
    padding-top: 10px;
  }

  .topbar {
    align-items: flex-start;
  }

  .topbar-meta {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .best-label,
  #saved-best {
    display: none;
  }

  .language-chip {
    margin-left: 0;
  }

  .test-card {
    box-shadow: 6px 6px 0 var(--shadow);
  }

  .test-heading {
    gap: 20px;
    padding: 24px 18px;
  }

  .test-heading h1 {
    font-size: clamp(2.15rem, 11vw, 3.7rem);
  }

  .test-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);
  }

  .test-stage {
    min-height: 570px;
    padding: 32px 14px 24px;
  }

  .test-stage .status-copy {
    min-height: 150px;
  }

  .signal-pad {
    min-height: 238px;
    padding: 20px 12px;
  }

  .signal-core {
    width: 96px;
    height: 96px;
    font-size: 3rem;
  }

  .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 (prefers-reduced-motion: reduce) {
  .test-stage,
  .signal-pad,
  .signal-core {
    transition: none;
  }

  .test-stage[data-state="waiting"] .signal-core {
    animation: none;
  }

  .deadline-fill {
    transition-duration: 0s !important;
  }
}