:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #52606d;
  --paper: #fbfaf7;
  --surface: #ffffff;
  --line: #ccd5dc;
  --accent: #075985;
  --accent-dark: #083e5b;
  --amber: #b45309;
  --focus: #d97706;
  --shadow: 0 5px 20px rgb(23 33 43 / 8%);
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.5; }
button, select { font: inherit; }
.shell { width: min(1160px, calc(100% - 2rem)); margin: 0 auto; padding: 2.5rem 0 4rem; }
.masthead { max-width: 850px; margin-bottom: 2rem; }
.masthead h1 { font-size: clamp(2rem, 6vw, 3.75rem); line-height: 1.05; margin: .2rem 0 .8rem; letter-spacing: -.04em; }
.masthead p:last-child { color: var(--muted); font-size: 1.1rem; max-width: 72ch; }
.eyebrow, .step { color: var(--accent-dark); font-weight: 750; letter-spacing: .05em; text-transform: uppercase; font-size: .78rem; margin: 0 0 .25rem; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: .8rem; box-shadow: var(--shadow); padding: clamp(1rem, 3vw, 1.6rem); }
h2 { font-size: 1.35rem; line-height: 1.15; margin: 0; }
.intro, .recap, .activity-heading { display: flex; justify-content: space-between; align-items: start; gap: 1rem; }
.game-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 1rem 0; }
.activity { display: flex; flex-direction: column; }
.counter { color: var(--accent-dark); font-weight: 700; margin: 0; white-space: nowrap; }
.hint { color: var(--muted); max-width: 75ch; }
.flash-card { display: grid; place-content: center; min-height: 190px; margin: 1rem 0; padding: 1.5rem; text-align: center; cursor: pointer; border: 2px solid var(--accent); border-radius: .7rem; background: linear-gradient(135deg, #eff8ff, #fff7ed); }
.flash-card:focus, button:focus, select:focus, input:focus { outline: 3px solid var(--focus); outline-offset: 3px; }
.card-label { color: var(--accent-dark); font-size: .78rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; margin: 0; }
.card-text { max-width: 40ch; margin: .7rem auto 0; font-size: 1.2rem; font-weight: 750; }
.button-row { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: auto; }
.button { cursor: pointer; padding: .62rem .85rem; color: #fff; background: var(--accent); border: 1px solid var(--accent); border-radius: .4rem; font-weight: 700; }
.button:hover { background: var(--accent-dark); }
.button.secondary { color: var(--accent-dark); background: #fff; border-color: var(--accent-dark); }
.matching-puzzle { display: grid; gap: .7rem; margin: 1rem 0; }
.match-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(150px, .7fr); align-items: center; gap: .75rem; padding: .7rem; border: 1px solid var(--line); border-radius: .45rem; font-weight: 650; }
select { min-height: 2.5rem; color: var(--ink); background: #fff; border: 1px solid #94a3b8; border-radius: .35rem; padding: .35rem; }
fieldset { border: 1px solid var(--line); border-radius: .5rem; margin: 1rem 0; padding: .8rem 1rem; }
legend { padding: 0 .25rem; font-weight: 750; }
.choice { display: flex; gap: .55rem; align-items: start; margin: .65rem 0 0; font-weight: 600; }
.choice input { width: 1.1rem; height: 1.1rem; margin-top: .2rem; accent-color: var(--accent); flex: 0 0 auto; }
.scenario { padding: 1rem; border-left: 4px solid var(--amber); background: #fff7ed; font-weight: 600; }
.feedback { min-height: 2.1rem; margin-top: 1rem; padding: .75rem; background: #f0f8fc; border-left: 4px solid var(--accent); }
.feedback:empty { display: none; }
.recap { margin-top: 1rem; }

@media (max-width: 760px) {
  .shell { width: min(100% - 1rem, 1160px); padding-top: 1rem; }
  .game-grid { grid-template-columns: 1fr; }
  .intro, .recap { flex-direction: column; }
  .match-row { grid-template-columns: 1fr; }
}