.stop-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: 850px; font-size: clamp(2.35rem, 6.5vw, 4.8rem); line-height: 0.94; }
.lede { max-width: 700px; margin: 18px 0 0; color: var(--muted); font-size: 1rem; line-height: 1.6; }

.progress-box {
  min-width: 150px;
  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: 0.7rem; font-weight: 800; letter-spacing: 0.08em; }
.progress-box strong { color: var(--gold); font-size: 1.6rem; }

.stats-grid { display: grid; grid-template-columns: repeat(5, 1fr); border-bottom: 3px solid var(--ink); }
.stat { min-width: 0; padding: 16px 8px; border-right: 2px solid var(--line); text-align: center; }
.stat:last-child { border-right: 0; }
.stat strong { font-size: clamp(1rem, 2.4vw, 1.4rem); }

.test-stage {
  min-height: 610px;
  padding: 38px 34px 30px;
  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% 28%, #2a2039 0, transparent 52%);
  background-size: 24px 24px, 24px 24px, auto;
}

.prompt-panel { display: flex; min-height: 400px; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.stage-kicker { margin: 0 0 12px; color: var(--gold); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.14em; }

.signal-frame {
  position: relative;
  display: grid;
  width: 166px;
  height: 142px;
  margin-bottom: 20px;
  place-items: center;
  border: 4px solid var(--line);
  background: #1c1627;
  box-shadow: 7px 7px 0 var(--shadow);
}

.arrow-symbol { color: var(--muted); font-size: 6rem; font-weight: 900; line-height: 1; }
.stop-badge {
  position: absolute;
  inset: 17px 12px;
  display: none;
  place-items: center;
  border: 4px solid #ffb1b8;
  background: var(--red);
  box-shadow: 0 0 32px rgba(237, 78, 92, 0.52);
  color: #fff6e9;
  font-size: 1.55rem;
  font-weight: 950;
  letter-spacing: 0.08em;
}

.test-stage[data-state="active"] .signal-frame { border-color: var(--cyan); }
.test-stage[data-stop-visible="true"] .signal-frame { border-color: var(--red); }
.test-stage[data-stop-visible="true"] .stop-badge { display: grid; }
.test-stage[data-state="feedback"][data-result="incorrect"],
.test-stage[data-state="game-over"] { background-color: #351521; }
.test-stage[data-state="complete"] { background-color: #2d2515; }

.prompt-panel h2 { margin: 0; font-size: clamp(1.45rem, 3.8vw, 2.55rem); letter-spacing: -0.04em; }
.prompt-panel > p:not(.stage-kicker) { max-width: 680px; min-height: 48px; margin: 14px 0 16px; color: var(--muted); line-height: 1.55; }

.deadline-track { width: min(520px, 100%); height: 9px; margin: 2px 0 14px; overflow: hidden; border: 2px solid var(--line); background: #120f1d; }
.deadline-track[hidden] { display: none; }
.deadline-fill { display: block; width: 100%; height: 100%; transform-origin: left; background: var(--cyan); }
.deadline-fill.is-danger { background: var(--red); }

.result-flash { display: flex; min-height: 52px; margin-bottom: 12px; flex-direction: column; justify-content: center; }
.result-flash[hidden] { display: none; }
.result-flash strong { color: var(--green); font-size: 1.8rem; }
.result-flash span { color: var(--muted); font-size: 0.84rem; }

.direction-pad { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; width: min(720px, 100%); margin: 12px auto 0; }
.direction-button {
  display: grid;
  grid-template-columns: auto 1fr auto;
  min-height: 92px;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  border: 3px solid var(--ink);
  border-radius: 0;
  background: #261e34;
  box-shadow: 6px 6px 0 var(--shadow);
  color: var(--ink);
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
}

.direction-button:disabled { cursor: default; opacity: 0.52; }
.direction-button:not(:disabled):hover { background: #332743; }
.direction-button:not(:disabled):active,
.direction-button.is-pressed { transform: translate(3px, 3px); box-shadow: 3px 3px 0 var(--shadow); }
.direction-button:focus-visible { outline: 4px solid var(--gold); outline-offset: 3px; }
.direction-mark { color: var(--cyan); font-size: 2.8rem; line-height: 1; }
.direction-button strong { justify-self: start; font-size: 0.95rem; letter-spacing: 0.08em; }
.key-pair { display: flex; gap: 5px; }
.key-pair kbd { min-width: 34px; padding: 6px; }

.control-note { margin: 18px 0 0; color: var(--muted); font-size: 0.86rem; line-height: 1.5; text-align: center; }
.test-stage[data-state="countdown"] .primary-button,
.test-stage[data-state="active"] .primary-button,
.test-stage[data-state="feedback"] .primary-button { visibility: hidden; }

.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; }

@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; }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .stat:nth-child(3) { border-right: 0; }
  .stat:nth-child(-n + 3) { border-bottom: 2px solid var(--line); }
  .stat:nth-child(4) { grid-column: span 1; }
  .stat:nth-child(5) { grid-column: span 2; border-right: 0; }
  .related-links { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .stop-shell { width: min(100% - 18px, 600px); padding-top: 10px; }
  .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, 3.5rem); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(odd), .stat:nth-child(even) { grid-column: span 1; border-right: 2px solid var(--line); border-bottom: 2px solid var(--line); }
  .stat:nth-child(even) { border-right: 0; }
  .stat:nth-child(5) { grid-column: span 2; border-right: 0; border-bottom: 0; }
  .test-stage { min-height: 680px; padding: 32px 14px 24px; }
  .prompt-panel { min-height: 420px; }
  .signal-frame { width: 142px; height: 122px; }
  .arrow-symbol { font-size: 5rem; }
  .direction-pad { gap: 10px; }
  .direction-button { grid-template-columns: 1fr; min-height: 120px; gap: 5px; padding: 12px 8px; text-align: center; }
  .direction-button strong { justify-self: center; }
  .direction-mark { font-size: 2.4rem; }
  .key-pair { justify-content: center; }
  .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) {
  .deadline-fill { transition: none !important; }
  .direction-button { transition: none; }
}