:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #292c31;
  background: #fffefa;
  font-synthesis: none;
  line-height: 1.65;
  --accent: #944631;
  --muted: #66686c;
  --border: #dddcd6;
}

* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; text-underline-offset: 0.22em; }
a:hover, button:hover { color: var(--accent); }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 5px;
}

.site-header, main, footer { width: min(100% - 5rem, 70rem); margin-inline: auto; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}
.wordmark {
  display: inline-flex;
  gap: 0.6rem;
  align-items: center;
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: -0.04em;
  text-decoration: none;
}
.introduction { max-width: 45rem; padding-block: 4.5rem 4rem; }
.eyebrow { color: var(--accent); font-size: 0.8rem; font-weight: 650; letter-spacing: 0.04em; margin: 0 0 0.85rem; }
h1 { font-size: clamp(2.75rem, 5.5vw, 4.5rem); font-weight: 550; letter-spacing: -0.055em; line-height: 1.08; margin: 0 0 1.25rem; }
.lead { font-size: 1.3rem; line-height: 1.5; margin-block: 0 1rem; }
.introduction > p:not(.eyebrow):not(.lead) { color: var(--muted); max-width: 38rem; }
.start-link { display: inline-block; font-size: 0.95rem; margin-top: 0.5rem; color: var(--accent); }
h2 { font-size: clamp(1.4rem, 2.2vw, 1.8rem); font-weight: 550; letter-spacing: -0.025em; line-height: 1.25; margin: 0 0 1rem; }
.exercise {
  display: grid;
  grid-template-columns: minmax(15rem, 0.85fr) minmax(0, 1.3fr);
  align-items: start;
  gap: 3.5rem;
  padding-block: 3rem;
  border-top: 1px solid var(--border);
  scroll-margin-top: 1.5rem;
}
.lesson-copy > p { margin-top: 0; }
ol { padding-left: 1.35rem; margin-block: 1.35rem; }
li { padding-left: 0.3rem; margin-bottom: 0.8rem; }
li::marker { color: var(--muted); font-size: 0.85rem; font-weight: 600; }
.quests { list-style: none; padding: 0; margin-bottom: 0.75rem; }
.quests li { display: grid; grid-template-columns: 1.5rem minmax(0, 1fr); align-items: baseline; gap: 0.65rem; padding: 0; }
.task-marker { display: inline-grid; place-items: center; width: 1.5rem; height: 1.5rem; border: 1px solid var(--border); border-radius: 50%; color: var(--muted); font-size: 0.75rem; font-weight: 600; }
.completed .task-marker { color: #fff; background: #387255; border-color: #387255; }
.lesson-progress { font-size: 0.8rem; color: #387255; margin-block: 0 1.3rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
strong { font-weight: 600; }
.aside, .session-note { color: var(--muted); font-size: 0.875rem; }
.editor-example { min-width: 0; }
.editor-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 2.5rem;
  font-size: 0.8rem;
  color: var(--muted);
}
.reset { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0.5rem 0.1rem 0.5rem 0.75rem; }
.reset span { margin-left: 0.2rem; font-size: 1.1rem; }
iframe { display: block; width: 100%; height: 19rem; border: 1px solid var(--border); border-radius: 4px; background: #f6f6f8; }
.editor-note { color: var(--muted); font-size: 0.75rem; margin: 0.6rem 0 0; min-height: 1.5rem; }
kbd { font: inherit; font-size: 0.9em; border: 1px solid var(--border); border-bottom-width: 2px; padding: 0.05em 0.3em; border-radius: 3px; white-space: nowrap; }
code { font-size: 0.95em; }
.next { border-top: 1px solid var(--border); padding-block: 3rem 3.5rem; }
.next p { max-width: 38rem; }
.next > a { color: var(--accent); }
.next .session-note { margin-top: 1.5rem; max-width: 42rem; }
footer { border-top: 1px solid var(--border); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem; padding-block: 1.5rem 2.5rem; font-size: 0.8rem; color: var(--muted); }

@media (max-width: 800px) {
  .site-header, main, footer { width: calc(100% - 2.5rem); }
  .introduction { padding-block: 3rem; }
  .exercise { grid-template-columns: minmax(0, 1fr); gap: 0.75rem; padding-block: 2.5rem; }
  .lesson-copy { max-width: 38rem; }
}