:root {
  color-scheme: light;
  --color-ink: #14212b;
  --color-muted: #52616d;
  --color-primary: #173f5f;
  --color-primary-strong: #0e2b43;
  --color-accent: #b93a3a;
  --color-surface: #ffffff;
  --color-tint: #eef5f8;
  --color-border: #cbd8de;
  --color-focus: #f3a712;
  --shadow-soft: 0 14px 40px rgb(23 63 95 / 10%);
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --font-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
}
a { color: var(--color-primary); }
a:focus-visible,
.button:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}
.skip-link {
  position: fixed;
  z-index: 20;
  top: var(--space-2);
  left: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: white;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }
.container {
  width: min(70rem, calc(100% - 2rem));
  margin-inline: auto;
}
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: rgb(255 255 255 / 94%);
}
.site-header__inner {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-block: var(--space-2);
}
.brand {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary-strong);
  font-weight: 800;
  text-decoration: none;
}
.brand__mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  font-size: 0.8rem;
}
.site-header__status {
  color: var(--color-muted);
  font-size: 0.85rem;
}
.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-2) var(--space-3);
  font-size: 0.9rem;
  font-weight: 700;
}
.site-nav a,
.link-button {
  color: var(--color-primary);
  text-decoration: none;
}
.site-nav form { margin: 0; }
.link-button {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  font: inherit;
}
.hero {
  overflow: hidden;
  background:
    radial-gradient(circle at 85% 20%, rgb(185 58 58 / 12%), transparent 25rem),
    linear-gradient(145deg, #f7fbfc 0%, #e6f1f5 100%);
}
.hero__content { padding-block: clamp(4rem, 10vw, 7rem); }
.eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--color-accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1, h2 {
  font-family: var(--font-display);
  line-height: 1.08;
}
h1 {
  max-width: 13ch;
  margin-bottom: var(--space-4);
  font-size: clamp(2.7rem, 8vw, 5.3rem);
  letter-spacing: -0.035em;
}
h2 {
  max-width: 18ch;
  margin-bottom: var(--space-5);
  font-size: clamp(2rem, 5vw, 3.25rem);
}
h3 {
  margin-bottom: var(--space-2);
  font-size: 1.2rem;
  line-height: 1.25;
}
.hero__lede {
  max-width: 42rem;
  margin-bottom: var(--space-5);
  color: var(--color-muted);
  font-size: clamp(1.1rem, 3vw, 1.3rem);
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1rem;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-weight: 750;
  text-align: center;
  text-decoration: none;
}
.button--primary { background: var(--color-primary); color: white; }
.button--secondary { background: transparent; color: var(--color-primary); }
.section { padding-block: clamp(3.5rem, 8vw, 6rem); }
.section--tinted { background: var(--color-primary-strong); color: white; }
.stage-grid { display: grid; gap: var(--space-4); }
.stage-card {
  position: relative;
  min-height: 15rem;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}
.stage-card__number {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: var(--space-5);
  place-items: center;
  border-radius: 50%;
  background: var(--color-tint);
  color: var(--color-primary);
  font-weight: 800;
}
.stage-card p { color: var(--color-muted); }
.badge {
  display: inline-flex;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: #d9ebe2;
  color: #174d33;
  font-size: 0.75rem;
  font-weight: 800;
}
.badge--muted { background: #edf0f2; color: #4b5963; }
.badge--attention { background: #fff0cc; color: #744c00; }
.split-panel { display: grid; gap: var(--space-4); }
.split-panel h2 { margin-bottom: 0; }
.split-panel p { color: #d7e5eb; font-size: 1.08rem; }
.site-footer {
  padding-block: var(--space-5);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.9rem;
}
.site-footer p:last-child { margin-bottom: 0; }
.install-guide {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  left: 1rem;
  z-index: 10;
  display: flex;
  max-width: 36rem;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: white;
  box-shadow: var(--shadow-soft);
}
.install-guide[hidden] { display: none; }
.install-guide p { margin-bottom: 0; }
.messages { padding-top: var(--space-3); }
.message {
  padding: var(--space-3);
  border: 1px solid #9bbac7;
  border-radius: var(--radius-sm);
  background: var(--color-tint);
}
.message--success { border-color: #86b99c; background: #edf8f1; }
.message--warning { border-color: #d5ae5d; background: #fff8e8; }
.narrow-panel { max-width: 42rem; }
.page-title { max-width: 20ch; font-size: clamp(2.3rem, 7vw, 4rem); }
.form-card,
.info-card,
.warning-card {
  margin-block: var(--space-4);
  padding: clamp(1.25rem, 4vw, 2rem);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: white;
  box-shadow: var(--shadow-soft);
}
.info-card { background: var(--color-tint); }
.warning-card { border-color: #d8a2a2; background: #fff2f2; }
.warning-card p:last-child,
.info-card p:last-child { margin-bottom: 0; }
.mode-note,
.recall-prompt {
  padding: var(--space-3);
  border-left: 0.3rem solid var(--color-primary);
  background: var(--color-tint);
}
.field { margin-bottom: var(--space-4); }
.field > label,
.answer-form legend {
  display: block;
  margin-bottom: var(--space-1);
  color: var(--color-ink);
  font-weight: 800;
}
.field input:not([type="checkbox"]):not([type="radio"]),
.field select {
  width: 100%;
  min-height: 3rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid #8298a3;
  border-radius: var(--radius-sm);
  background: white;
  color: var(--color-ink);
  font: inherit;
}
.field ul,
.answer-form ul { margin: 0; padding: 0; list-style: none; }
.field li { margin-bottom: var(--space-1); }
.field li label { display: flex; gap: var(--space-2); align-items: flex-start; }
.help-text { margin-top: var(--space-1); color: var(--color-muted); font-size: 0.85rem; }
.help-text ul { padding-left: 1.2rem; list-style: disc; }
.field-errors,
.form-errors { margin-block: var(--space-2); color: #8f1d1d; font-weight: 700; }
.field-errors ul,
.form-errors ul { margin: 0; padding-left: 1.2rem; }
.field--error input,
.field--error select { border-color: #a82424; }
.form-links,
.account-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-4);
}
.button--danger { border-color: #9c2525; background: #9c2525; color: white; }
.practice-shell { max-width: 52rem; }
.practice-meta {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
  color: var(--color-muted);
  font-size: 0.9rem;
  font-weight: 700;
}
.progress-track {
  height: 0.55rem;
  margin-bottom: var(--space-4);
  overflow: hidden;
  border-radius: 999px;
  background: #dce6ea;
}
.progress-track span { display: block; height: 100%; border-radius: inherit; background: var(--color-accent); }
.question-card,
.feedback-card {
  padding: clamp(1.25rem, 5vw, 3rem);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: white;
  box-shadow: var(--shadow-soft);
}
.question-card__category,
.result-label {
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.question-title { max-width: 24ch; margin-bottom: var(--space-5); font-size: clamp(1.8rem, 5vw, 3rem); }
.answer-form fieldset { margin: 0; padding: 0; border: 0; }
.answer-form li { margin-bottom: var(--space-2); }
.answer-form li label {
  display: flex;
  min-height: 3.5rem;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.answer-form input { width: 1.25rem; height: 1.25rem; flex: 0 0 auto; }
.answer-form li label:has(input:checked) { border-color: var(--color-primary); background: var(--color-tint); }
.practice-actions,
.preference-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-5);
}
.preference-actions { justify-content: flex-start; }
.feedback-card { border-top: 0.45rem solid #a82424; }
.feedback-card--correct { border-top-color: #24764a; }
.feedback-section { padding-block: var(--space-3); border-top: 1px solid var(--color-border); }
.feedback-section h2 { margin-bottom: var(--space-2); font-family: var(--font-body); font-size: 1rem; }
.revealed-answer {
  margin-block: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  background: #edf8f1;
}
.revealed-answer ul { margin-bottom: 0; }
.category-summary { margin-block: var(--space-5); }
.category-summary h2 { margin-bottom: var(--space-3); font-size: 1.5rem; }
.listening-shell { max-width: 56rem; }
.listening-card { min-height: 18rem; padding: clamp(1.25rem, 5vw, 3rem); border-radius: var(--radius-md); background: var(--color-primary-strong); color: white; }
.listening-card h2 { max-width: 28ch; margin-bottom: var(--space-4); font-size: clamp(1.8rem, 5vw, 3rem); }
.listening-position { color: #cfe0e8; }
.transport-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-2); margin-block: var(--space-4); }
.voice-button { min-height: 4rem; padding: var(--space-2); border: 2px solid var(--color-primary); border-radius: var(--radius-sm); background: white; color: var(--color-primary); font: inherit; font-weight: 800; }
.voice-button--primary { background: var(--color-primary); color: white; }
.listening-settings { display: grid; gap: var(--space-4); padding: clamp(1rem, 3vw, 1.5rem); border-radius: var(--radius-md); background: var(--color-tint); }
.listening-setting { display: grid; align-content: start; gap: var(--space-1); min-width: 0; }
.listening-setting > label { font-weight: 800; }
.listening-setting select { width: 100%; min-height: 3rem; padding: 0.5rem; border: 1px solid #8298a3; border-radius: .2rem; background: white; font: inherit; font-weight: 650; }
.listening-toggles { display: grid; gap: var(--space-2); padding-top: var(--space-3); border-top: 1px solid var(--color-border); }
.listening-settings .check-setting { display: flex; align-items: center; gap: var(--space-2); min-height: 2.75rem; font-weight: 800; }
.listening-settings .check-setting input { width: 1.25rem; height: 1.25rem; margin: 0; accent-color: var(--color-primary); }
.listening-settings .check-setting span { line-height: 1.2; }
.listening-builder { display: grid; gap: var(--space-3); }
.listening-builder .field { margin: 0; }
.listening-shell.is-drive-mode .listening-builder,
.listening-shell.is-drive-mode .listening-setting,
.listening-shell.is-drive-mode .listening-toggles .check-setting:first-child,
.listening-shell.is-drive-mode [data-action="reveal"] { display: none; }
.listening-shell.is-drive-mode .transport-controls { position: sticky; bottom: 1rem; padding: 1rem; background: rgba(255, 255, 255, .96); border: 2px solid var(--color-primary); border-radius: var(--radius-md); }
@media (min-width: 46rem) { .transport-controls { grid-template-columns: repeat(4, minmax(0, 1fr)); } .listening-settings { grid-template-columns: repeat(2, minmax(0, 1fr)); } .listening-toggles { grid-column: 1 / -1; grid-template-columns: repeat(2, minmax(0, 1fr)); } .listening-builder { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }
.speech-input-controls { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-block: var(--space-3); }
.spoken-form textarea { width: 100%; padding: var(--space-3); border: 1px solid #8298a3; border-radius: var(--radius-sm); font: inherit; }
.evaluation-card { margin-block: var(--space-4); padding: var(--space-4); border: 1px solid var(--color-border); border-top: 0.45rem solid #a82424; border-radius: var(--radius-md); }
.evaluation-card--correct { border-top-color: #24764a; }
.evaluation-card--partial, .evaluation-card--needs_review { border-top-color: #d0921f; }
.evaluation-card h2 { margin-bottom: var(--space-3); font-size: 2rem; }
.current-answer-note { margin-bottom: var(--space-4); padding: var(--space-3); border-left: 0.35rem solid #d0921f; background: #fff8e8; }
.current-answer-note--current { border-left-color: #24764a; background: #edf8f1; }
.current-answer-note p:last-child { margin-bottom: 0; }
.learn-filters { display: grid; gap: var(--space-3); }
.learn-filters .field { margin-bottom: 0; }
.learn-list { margin-top: var(--space-5); }
.learn-row { display: grid; gap: var(--space-3); padding-block: var(--space-4); border-top: 1px solid var(--color-border); }
.learn-row h2 { max-width: none; margin-bottom: var(--space-2); font-family: var(--font-body); font-size: 1.2rem; }
.learn-row p { margin-bottom: 0; color: var(--color-muted); }
.learn-badges, .learn-audio-actions, .learn-state-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
.learn-audio-actions label { display: grid; gap: .25rem; font-weight: 800; }
.learn-audio-actions select { min-height: 3rem; max-width: 20rem; padding: .5rem; font: inherit; }
.learn-card .revealed-answer h2, .learn-explanation h2 { margin-bottom: var(--space-2); font-family: var(--font-body); font-size: 1.2rem; }
.learn-state-actions { margin-top: var(--space-4); }
.learn-state-actions form { margin: 0; }
.review-actions form { margin: 0; }
.mastery-list { margin-top: var(--space-5); }
.mastery-list article { display: grid; gap: var(--space-3); padding-block: var(--space-4); border-top: 1px solid var(--color-border); }
.mastery-list h2 { max-width: none; margin-bottom: var(--space-2); font-family: var(--font-body); font-size: 1.1rem; }
.mastery-list p { margin-bottom: var(--space-1); color: var(--color-muted); }
@media (min-width: 46rem) { .mastery-list article { grid-template-columns: 1fr auto; } }
.source-note { color: var(--color-muted); font-size: 0.85rem; }
.score-card {
  display: inline-flex;
  flex-direction: column;
  min-width: 10rem;
  margin-block: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: white;
  text-align: center;
}
.score-card strong { font-size: 2.5rem; line-height: 1; }
.result-list { margin-block: var(--space-5); }
.result-list article { display: flex; gap: var(--space-3); padding-block: var(--space-3); border-top: 1px solid var(--color-border); }
.result-list h2 { max-width: none; margin-bottom: 0; font-family: var(--font-body); font-size: 1rem; }
.result-list p { margin-bottom: 0; color: var(--color-muted); }
.result-dot { width: 0.85rem; height: 0.85rem; margin-top: 0.35rem; flex: 0 0 auto; border-radius: 50%; background: #a82424; }
.result-dot--correct { background: #24764a; }
.dashboard-hero { background: var(--color-tint); }
.metric-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); margin-bottom: var(--space-6); }
.metric-grid article { display: flex; flex-direction: column; padding: var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.metric-grid strong { color: var(--color-primary); font-size: 2rem; }
.metric-grid span { color: var(--color-muted); font-size: 0.85rem; }
.dashboard-grid { display: grid; gap: var(--space-5); }
.dashboard-grid h2 { margin-bottom: var(--space-3); font-family: var(--font-body); font-size: 1.3rem; }
.category-list > div { display: grid; grid-template-columns: 1fr auto; gap: 0 var(--space-3); padding-block: var(--space-2); border-top: 1px solid var(--color-border); }
.category-list small { color: var(--color-muted); }
.recent-list { margin: 0; padding: 0; list-style: none; }
.recent-list li { display: grid; grid-template-columns: 5rem 1fr; gap: var(--space-2); padding-block: var(--space-2); border-top: 1px solid var(--color-border); }
.recent-list span { color: var(--color-accent); font-size: 0.78rem; font-weight: 800; text-transform: uppercase; }

@media (min-width: 44rem) {
  .container { width: min(70rem, calc(100% - 4rem)); }
  .stage-grid { grid-template-columns: repeat(2, 1fr); }
  .split-panel { grid-template-columns: 0.9fr 1.1fr; gap: var(--space-7); }
  .metric-grid { grid-template-columns: repeat(4, 1fr); }
  .dashboard-grid { grid-template-columns: repeat(2, 1fr); }
  .learn-filters { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learn-row { grid-template-columns: 1fr auto; }
}
@media (min-width: 68rem) {
  .stage-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}