.drill-intro {
  padding-block: clamp(2.3rem, 5vw, 4.4rem);
  border-bottom: 1px solid var(--line);
  background: #f0efe5;
}

.drill-intro > .drill-hero,
main > section.drill-intro > .shell.drill-hero {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
  align-items: center;
  gap: clamp(1.3rem, 5vw, 4.5rem);
  overflow: hidden;
  padding: clamp(1.1rem, 4vw, 3.1rem);
  border: 1px solid #c4d0bf;
  border-radius: calc(var(--radius) * 1.2);
  background: var(--paper);
  box-shadow: 0 .6rem 1.6rem #172a2108;
}

.drill-hero::after {
  position: absolute;
  z-index: -1;
  inset: 0;
  content: "";
  background:
    radial-gradient(#637b6a50 1px, transparent 1px) 0 0 / .85rem .85rem,
    linear-gradient(100deg, transparent, #e0e9d8 75%);
  opacity: .62;
  mask-image: linear-gradient(90deg, transparent 43%, #000);
  pointer-events: none;
}

.drill-intro-copy { min-width: 0; }
.drill-intro-copy .eyebrow { color: #84351e; }
.drill-intro-copy h2 {
  margin-block: .45rem .65rem;
  color: var(--ink-deep);
  font-size: clamp(1.8rem, 4.5vw, 3.2rem);
  font-weight: 780;
  letter-spacing: -.06em;
  text-wrap: balance;
}
.drill-intro-copy > p:not(.eyebrow) { max-width: 55ch; color: var(--muted); text-wrap: pretty; }

.drill-actions,
.drill-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
}

.drill-actions { margin-top: 1.1rem; }
.drill-actions .button { min-height: 2.9rem; }

.drill-example-card {
  min-width: 0;
  padding: clamp(1rem, 3vw, 1.65rem);
  border: 1px solid #4f6857;
  border-radius: var(--radius);
  background: var(--terminal);
  color: #e9f0e9;
  box-shadow: 0 .65rem 1.6rem #172a212a;
}

.drill-example-card .eyebrow,
.drill-example-card small {
  color: #bcd8c1;
  font-size: .75rem;
}

.drill-example-card > * + * { margin-top: .68rem; }
.drill-example-card pre,
.drill-example-card > code {
  display: block;
  font: 660 clamp(1rem, 3vw, 1.35rem)/1.65 var(--mono);
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.drill-example-card .drill-blank { color: #ffb298; }

.drill-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .65rem;
  margin-top: .9rem;
  color: var(--muted);
  font-size: .78rem;
}

.drill-metrics > * {
  padding: .25rem .55rem;
  border: 1px solid #d3ddcf;
  border-radius: 1rem;
  background: #eef3ea;
}

.drill-example-card .drill-metrics { color: #d7e6d9; }
.drill-example-card .drill-metrics > * { border-color: #54705c; background: #263f31; }

#drill-dialog { width: min(57rem, calc(100vw - 2rem)); }
#drill-dialog .icon-button { min-width: 2.75rem; min-height: 2.75rem; }
#drill-body { padding: clamp(.85rem, 3.2vw, 1.65rem); }
#drill-body h3 { letter-spacing: -.03em; }
#drill-body > .drill-explain { max-width: 67ch; }

.drill-stage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12.5rem), 1fr));
  gap: .55rem;
}

.drill-stage-button {
  display: grid;
  align-content: start;
  justify-items: start;
  gap: .3rem;
  min-width: 0;
  min-height: 5.2rem;
  padding: .65rem .75rem;
  border: 1px solid #ccd5ca;
  border-radius: .58rem;
  background: var(--paper);
  color: var(--ink);
  text-align: left;
  line-height: 1.35;
}

.drill-stage-button:not(:disabled):hover { border-color: #91ad93; background: #f0f4eb; }
.drill-stage-button > :is(.drill-stage-id, .eyebrow) {
  color: var(--green);
  font: 740 .7rem/1.2 var(--mono);
  letter-spacing: .06em;
}

.drill-stage-button strong { display: block; font-size: .88rem; }
.drill-stage-button small { display: block; color: var(--muted); font-size: .72rem; }
.drill-stage-button[data-state="current"] { border-color: #b25535; background: #fff4e9; }
.drill-stage-button[data-state="current"] > :is(.drill-stage-id, .eyebrow) { color: #84351e; }
.drill-stage-button[data-state="done"] { border-color: #a9c2ab; background: #eff5eb; }
.drill-stage-button:disabled { border-color: #e0e1d9; background: #f2f1e9; color: var(--muted); }

.drill-session-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: .5rem .75rem;
  padding: .65rem .8rem;
  border: 1px solid #c7d6c5;
  border-radius: .6rem;
  background: #eff3eb;
}

.drill-session-top > * { min-width: 0; }
.drill-session-top progress { flex: 1 1 100%; }
.drill-counter,
.drill-timer {
  color: var(--green);
  font: 700 clamp(.75rem, 2.5vw, .95rem)/1.45 var(--mono);
  font-variant-numeric: tabular-nums;
}

.drill-timer { padding: .24rem .48rem; border-radius: .35rem; background: #dae8d8; }
.drill-explain { color: var(--muted); font-size: .87rem; line-height: 1.54; text-wrap: pretty; }

.drill-workspace {
  min-width: 0;
  padding: clamp(.75rem, 2.4vw, 1.15rem);
  border: 1px solid var(--line);
  border-radius: .75rem;
  background: #f5f3ea;
}

.drill-workspace > * + * { margin-top: .7rem; }
.drill-prompt {
  display: block;
  min-width: 0;
  max-width: 100%;
  min-height: 3.75rem;
  padding: clamp(.75rem, 2.2vw, 1.15rem);
  border: 1px solid #486454;
  border-radius: .55rem;
  background: var(--terminal);
  color: #f5f0df;
  font: 660 clamp(1rem, 3vw, 1.25rem)/1.62 var(--mono);
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.drill-blank { color: #f5aa8d; font-weight: 900; }

.drill-answer-form {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: .6rem;
}

.drill-answer-form > label {
  display: grid;
  flex: 1 1 100%;
  gap: .35rem;
  min-width: 0;
  color: var(--green);
  font-size: .82rem;
  font-weight: 720;
}
.drill-answer-form > label:has(.drill-answer) { flex-basis: 13rem; }
.drill-answer {
  flex: 1 1 13rem;
  width: 100%;
  min-width: 0;
  min-height: 2.85rem;
  padding: .5rem .65rem;
  border: 1px solid #8b9e8e;
  border-radius: .45rem;
  background: var(--paper);
  color: var(--ink-deep);
  font: 650 1rem/1.35 var(--mono);
}
.drill-answer-form .button { min-height: 2.85rem; }
.drill-answer[aria-invalid="true"] { border-color: #a24122; }
.drill-answer:focus-visible { outline-offset: 2px; }

.drill-keys {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  padding: 0;
}
.drill-keys button {
  min-width: 2.8rem;
  min-height: 2.8rem;
  padding: .33rem .48rem;
  border: 1px solid #a9baaa;
  border-radius: .44rem;
  background: var(--paper);
  color: var(--ink-deep);
  font: 740 1.05rem/1 var(--mono);
}
.drill-keys button:not(:disabled):hover { border-color: var(--green); background: #e7efe4; }

.drill-sample,
.drill-status {
  padding: .65rem .75rem;
  border: 1px solid #cbd9ca;
  border-radius: .48rem;
  background: #edf3e9;
  color: var(--green);
  font-size: .86rem;
}
.drill-sample summary { cursor: pointer; font-weight: 750; }
.drill-sample pre { overflow-wrap: anywhere; white-space: pre-wrap; }
.drill-sample pre:not(:first-child) { margin-top: .5rem; }
.drill-status:empty { padding: 0; border: 0; margin: 0; }
.drill-status[data-state="error"], .drill-status[data-state="incorrect"] {
  border-color: #e1b59e;
  background: #fceddf;
  color: #803119;
}
.drill-status[data-state="success"], .drill-status[data-state="correct"] {
  border-color: #aac7a9;
  color: #1c5338;
}

.drill-results {
  display: grid;
  gap: .7rem;
  padding: clamp(.85rem, 3vw, 1.25rem);
  border: 1px solid #c6d6c3;
  border-radius: .7rem;
  background: #f0f5ec;
}
.drill-score { color: var(--green); font-weight: 800; font-variant-numeric: tabular-nums; }
.drill-results .drill-score { font-size: clamp(1.2rem, 4vw, 1.75rem); letter-spacing: -.035em; }
.drill-results > p { max-width: 65ch; }

@media (max-width: 43rem) {
  .drill-intro > .drill-hero,
  main > section.drill-intro > .shell.drill-hero { grid-template-columns: minmax(0, 1fr); }
  .drill-hero::after { mask-image: linear-gradient(150deg, transparent 37%, #000); }
  .drill-stage-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 9rem), 1fr)); }
  .drill-answer-form > label:has(.drill-answer) { flex-basis: 100%; }
}

@media (max-width: 29rem) {
  #drill-dialog { width: calc(100vw - 1rem); }
  .drill-answer-form .button { width: 100%; }
  .drill-keys button { min-width: 2.75rem; }
  .drill-stage-button { min-height: 4.5rem; }
}

@media (forced-colors: active) {
  .drill-stage-button:is([data-state="current"], [data-state="done"]) { border: 2px solid Highlight; }
  .drill-prompt, .drill-keys button { border: 1px solid ButtonText; }
}

.drill-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.drill-time-option {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  min-height: 44px;
  cursor: pointer;
  font-weight: 650;
}

.drill-time-option input {
  width: 1.15rem;
  height: 1.15rem;
  accent-color: #244838;
}

.drill-map {
  margin-top: 1.25rem;
}

.drill-map summary {
  width: fit-content;
  padding: .6rem 0;
  font-weight: 700;
  cursor: pointer;
}

.drill-home-summary .progress-track {
  margin: .45rem 0 .8rem;
}

.drill-map h3 {
  margin: .8rem 0 .35rem;
  font-size: .92rem;
}