:root {
  color-scheme: light;
  --ivory: #FBF7EE;
  --surface: #FFFDF8;
  --navy: #17253F;
  --muted: #58647A;
  --teal: #087E78;
  --teal-dark: #065F5B;
  --sand: #E9DDC6;
  --line: #CFC6B5;
  --focus: #A64600;
  --danger: #8B2F2F;
  --radius: 18px;
  font-family: Tahoma, Arial, "Noto Sans Arabic", system-ui, sans-serif;
  background: var(--ivory);
  color: var(--navy);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --ivory: #101A2E;
  --surface: #17253F;
  --navy: #F8F3E9;
  --muted: #D2CCBF;
  --teal: #54C8BE;
  --teal-dark: #8ADBD4;
  --sand: #293953;
  --line: #52617A;
  --focus: #FFB56F;
  --danger: #FFB0A8;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  min-inline-size: 320px;
  background: var(--ivory);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-block-size: 100vh;
  background:
    radial-gradient(circle at 15% 0%, color-mix(in srgb, var(--teal) 8%, transparent), transparent 30rem),
    var(--ivory);
  color: var(--navy);
  font-size: 18px;
  line-height: 1.65;
  overflow-x: hidden;
  overflow-wrap: anywhere;
}

button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
[hidden] { display: none !important; }

a { color: var(--teal-dark); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute !important;
  inline-size: 1px !important;
  block-size: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: fixed;
  inset-block-start: 10px;
  inset-inline-start: 10px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--navy);
  color: var(--ivory);
  transform: translateY(-180%);
}
.skip-link:focus { transform: translateY(0); }

.page-shell {
  inline-size: min(100% - 28px, 1120px);
  margin-inline: auto;
}

.site-header {
  border-block-end: 1px solid var(--line);
  background: color-mix(in srgb, var(--ivory) 92%, transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-block-size: 72px;
}

.brand {
  color: var(--navy);
  font-size: 1.35rem;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -0.02em;
}
.brand span { color: var(--teal); }

.primary-nav, .footer-nav, .header-actions, .view-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.primary-nav a, .footer-nav a {
  min-block-size: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--navy);
  text-decoration: none;
}

.header-actions { flex-wrap: nowrap; }

.text-button, .icon-button, .primary-button, .secondary-button,
.reasoning-option, .comparison-button, .memory-cell {
  min-block-size: 44px;
  min-inline-size: 44px;
  border: 2px solid transparent;
  border-radius: 12px;
  cursor: pointer;
}

.text-button, .icon-button {
  background: transparent;
  color: var(--navy);
}

.primary-button, .secondary-button {
  padding: 10px 22px;
  font-weight: 700;
}

.primary-button {
  border-color: var(--teal-dark);
  background: var(--teal);
  color: #FFFFFF;
}

:root[data-theme="dark"] .primary-button { color: #071B1A; }
.primary-button:hover { background: var(--teal-dark); }

.secondary-button {
  border-color: var(--line);
  background: var(--surface);
  color: var(--navy);
}

button:disabled { cursor: not-allowed; opacity: 0.55; }

main {
  inline-size: min(100% - 28px, 960px);
  min-block-size: calc(100vh - 190px);
  margin-inline: auto;
  padding-block: clamp(28px, 6vw, 72px);
}

.session-notice {
  margin: 0 auto 18px;
  padding: 12px 16px;
  border-inline-start: 5px solid var(--teal);
  border-radius: 10px;
  background: var(--surface);
}

.landing-view, .readiness-view, .loading-view, .error-view,
.practice-feedback, .task-view, .results-view, .research-view {
  inline-size: min(100%, 840px);
  margin-inline: auto;
}

.hero-card, .readiness-form, .task-view, .quality-card, .raw-task-card,
.limitations-card, .receipt-card, .research-view, .practice-feedback,
.loading-view, .error-view {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.hero-card {
  padding: clamp(24px, 7vw, 64px);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--teal-dark);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

h1, h2, p { margin-block-start: 0; }
h1 { font-size: clamp(2rem, 8vw, 4.25rem); line-height: 1.13; letter-spacing: -0.035em; }
h2 { line-height: 1.3; }
.task-heading, .results-view h1, .research-view h1, .practice-feedback h1, .readiness-view h1 { font-size: clamp(1.75rem, 5vw, 2.7rem); }
.hero-lead, .view-lead { font-size: 1.15rem; color: var(--muted); }

.claim-boundary {
  padding: 14px 16px;
  border-inline-start: 5px solid var(--teal);
  background: color-mix(in srgb, var(--teal) 8%, var(--surface));
  font-weight: 700;
}

.visual-disclosure { color: var(--muted); }

.readiness-form, .research-view, .practice-feedback, .loading-view, .error-view {
  padding: clamp(20px, 5vw, 40px);
}

.readiness-form { display: grid; gap: 24px; }
.check-row, .consent-row { display: flex; align-items: flex-start; gap: 12px; }
.check-row input, .consent-row input { inline-size: 24px; block-size: 24px; flex: none; margin-block-start: 5px; }

fieldset { min-inline-size: 0; }
.mode-options { display: grid; gap: 12px; margin: 0; padding: 0; border: 0; }
.mode-options legend { margin-block-end: 12px; font-weight: 800; }
.mode-card {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 2px 12px;
  padding: 15px;
  border: 2px solid var(--line);
  border-radius: 14px;
  cursor: pointer;
}
.mode-card:has(input:checked) { border-color: var(--teal); background: color-mix(in srgb, var(--teal) 8%, var(--surface)); }
.mode-card input { inline-size: 22px; block-size: 22px; grid-row: 1 / 3; }
.mode-title { font-weight: 800; }
.mode-card small { color: var(--muted); }

.inline-error { color: var(--danger); font-weight: 700; }

.task-view { padding: clamp(18px, 4vw, 34px); }
.task-instruction { color: var(--muted); }
.task-meta { display: grid; gap: 6px; margin-block-end: 20px; }
.task-meta progress { inline-size: 100%; block-size: 10px; accent-color: var(--teal); }
.task-time { margin: 0; color: var(--muted); font-size: 0.88rem; }

.visual-invariant { direction: ltr; }
.reasoning-stimulus {
  display: grid;
  gap: 10px;
  min-inline-size: 226px;
  max-inline-size: 470px;
  margin: 20px auto;
  overflow-x: auto;
}
.reasoning-cell {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  min-block-size: 72px;
  border: 2px solid var(--line);
  border-radius: 12px;
  background: var(--ivory);
  color: var(--navy);
}
.reasoning-cell.is-missing { font-size: 2rem; font-weight: 800; }
.geometry-svg { inline-size: 100%; block-size: 100%; max-inline-size: 104px; }

.reasoning-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(68px, 1fr));
  gap: 12px;
  max-inline-size: 460px;
  margin-inline: auto;
}
.reasoning-option {
  min-block-size: 82px;
  padding: 4px;
  border-color: var(--line);
  background: var(--ivory);
  color: var(--navy);
}
.reasoning-option:hover { border-color: var(--teal); }

.comparison-pair {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-block: 24px;
}
.comparison-symbol { inline-size: min(32vw, 112px); block-size: min(32vw, 112px); color: var(--navy); }
.comparison-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; direction: ltr; }
.comparison-button { min-block-size: 56px; padding: 8px; border-color: var(--line); background: var(--surface); font-weight: 800; }
.comparison-button:hover { border-color: var(--teal); }

.memory-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(44px, 88px));
  gap: 8px;
  justify-content: center;
  margin-block: 24px;
}
.memory-cell {
  aspect-ratio: 1;
  border-color: var(--line);
  background: var(--ivory);
  color: var(--navy);
}
.memory-cell.is-flash {
  border-color: var(--navy);
  background: var(--teal);
  box-shadow: inset 0 0 0 5px var(--navy);
}
.selection-dots { display: flex; justify-content: center; gap: 9px; margin-block: 18px; }
.selection-dots span { inline-size: 12px; block-size: 12px; border: 2px solid var(--navy); border-radius: 50%; background: transparent; }
.selection-dots span.is-filled { background: var(--teal); box-shadow: inset 0 0 0 2px var(--surface); }
.memory-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.memory-controls .primary-button { grid-column: 1 / -1; }

.feedback-message { padding: 16px; border: 3px solid var(--navy); border-radius: 12px; }
.feedback-message.is-correct { background: color-mix(in srgb, var(--teal) 15%, var(--surface)); }
.feedback-message.is-review { background: color-mix(in srgb, var(--sand) 45%, var(--surface)); }

.calm-loader {
  inline-size: 64px;
  block-size: 8px;
  border-radius: 999px;
  background: var(--teal);
  animation: calm-pulse 1.4s ease-in-out infinite alternate;
}
@keyframes calm-pulse { from { opacity: 0.35; transform: scaleX(0.55); } to { opacity: 1; transform: scaleX(1); } }

.results-view { display: grid; gap: 18px; }
.quality-card, .limitations-card, .receipt-card { padding: 20px; }
.raw-results { display: grid; gap: 14px; }
.raw-task-card { padding: 20px; border-block-start: 6px solid var(--teal); }
.metric-list { padding-inline-start: 1.25em; }
.receipt-card code { display: block; direction: ltr; overflow-wrap: anywhere; }
.receipt-credentials { display: grid; gap: 12px; margin-block: 16px; }
.receipt-credentials div { display: grid; gap: 4px; }
.receipt-credentials dd { margin: 0; }
.view-actions { margin-block-start: 12px; }

.research-form { display: grid; gap: 18px; }
.research-explanation { color: var(--muted); }
.research-stats { padding: 12px; border-radius: 10px; background: var(--sand); }

.site-footer { border-block-start: 1px solid var(--line); }
.footer-inner { padding-block: 22px; display: grid; gap: 10px; }
.footer-inner p { margin: 0; color: var(--muted); }

@media (min-width: 720px) {
  .raw-results { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-inner { grid-template-columns: 1fr auto; align-items: center; }
}

@media (max-width: 620px) {
  .primary-nav { display: none; }
  .header-inner { min-block-size: 64px; }
  main { inline-size: min(100% - 20px, 960px); padding-block: 24px; }
  .task-view { padding-inline: 12px; }
  .view-actions > * { inline-size: 100%; }
}

@media (max-width: 370px) {
  body { font-size: 17px; }
  .page-shell { inline-size: min(100% - 18px, 1120px); }
  .comparison-pair { gap: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}