:root {
  color-scheme: light;
  --bg: #f5f7f4;
  --surface: #ffffff;
  --surface-muted: #eef2ec;
  --text: #18201b;
  --muted: #5b665f;
  --line: #d8dfd5;
  --accent: #19764b;
  --accent-dark: #105c39;
  --danger: #a93a2f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

button,
input,
textarea {
  font: inherit;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(360px, 1fr) minmax(280px, 360px);
  gap: 1px;
  min-height: 100vh;
  background: var(--line);
}

.setup-pane,
.practice-pane,
.feedback-pane {
  background: var(--surface);
  padding: 28px;
}

.practice-pane {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 750;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.08;
}

h1 {
  max-width: 9ch;
  font-size: clamp(42px, 6vw, 74px);
}

h2 {
  font-size: 22px;
}

.lede {
  max-width: 28ch;
  margin: 18px 0 30px;
  color: var(--muted);
  line-height: 1.5;
}

.stacked-form,
.answer-form {
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfcfa;
  color: var(--text);
  padding: 12px;
  outline: none;
}

textarea {
  min-height: 160px;
  resize: vertical;
  line-height: 1.45;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(25, 118, 75, 0.12);
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font-weight: 750;
}

button:hover:not(:disabled) {
  background: var(--accent-dark);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.status-line,
.error-line {
  min-height: 20px;
  margin: 18px 0 0;
  font-size: 13px;
}

.status-line {
  color: var(--muted);
}

.error-line {
  color: var(--danger);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
}

.question-list {
  display: grid;
  gap: 10px;
}

.question-button {
  border: 1px solid var(--line);
  background: #fbfcfa;
  color: var(--text);
  padding: 16px;
  min-height: 72px;
  text-align: left;
}

.question-button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--surface-muted);
}

.question-id {
  display: block;
  margin-bottom: 5px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 750;
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: 6px;
  color: var(--muted);
  padding: 18px;
}

.feedback {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.progress-heading {
  margin-top: 34px;
}

.small-button {
  min-height: 34px;
  padding: 0 12px;
  font-size: 12px;
}

.metric-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.grade {
  color: var(--accent);
  font-size: 38px;
  font-weight: 800;
}

.readiness-value {
  color: var(--accent);
  font-size: 48px;
  font-weight: 850;
  line-height: 1;
}

.concept-pill {
  display: inline-flex;
  margin: 4px 6px 4px 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 9px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.small-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.45;
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: 100%;
    font-size: 42px;
  }
}