:root {
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: #17212b;
  background: #f7f7f4;
  font-synthesis: none;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
}

button,
textarea,
input {
  font: inherit;
}

a { color: inherit; }

.shell {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  padding: 72px 0 44px;
}

.eyebrow {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  opacity: 0.62;
}

h1 {
  max-width: 780px;
  margin: 10px 0 14px;
  font-size: clamp(2.7rem, 8vw, 5.7rem);
  line-height: 0.92;
  letter-spacing: -0.055em;
}

.lede {
  max-width: 710px;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.55;
  color: #46515b;
}

.privacy-note {
  display: inline-flex;
  gap: 8px;
  margin-top: 18px;
  padding: 9px 12px;
  border: 1px solid #ccd1d3;
  border-radius: 999px;
  background: white;
  font-size: 0.9rem;
}

.lesson {
  margin: 0 0 28px;
  padding: clamp(22px, 5vw, 38px);
  border: 1px solid #d8dcdd;
  border-radius: 20px;
  background: white;
  box-shadow: 0 12px 40px rgba(30, 40, 45, 0.04);
}

.lesson-number {
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  opacity: 0.55;
}

.lesson h2 {
  margin: 6px 0 8px;
  font-size: clamp(1.65rem, 4vw, 2.4rem);
  letter-spacing: -0.03em;
}

.lesson p {
  max-width: 760px;
  line-height: 1.6;
}

textarea {
  width: 100%;
  min-height: 120px;
  margin-top: 8px;
  padding: 14px;
  resize: vertical;
  border: 1px solid #bcc4c7;
  border-radius: 12px;
  background: #fbfbfa;
}

.output {
  min-height: 52px;
  margin-top: 14px;
  padding: 14px;
  overflow-wrap: anywhere;
  border-radius: 12px;
  background: #18212a;
  color: #f3f6f7;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  line-height: 1.5;
}

.callout {
  margin-top: 18px;
  padding: 16px 18px;
  border-left: 4px solid #17212b;
  background: #f2f3ef;
  line-height: 1.55;
}

.roadmap {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.roadmap li {
  display: grid;
  grid-template-columns: 42px 1fr;
  align-items: start;
  gap: 10px;
  padding: 14px;
  border: 1px solid #dde0df;
  border-radius: 12px;
}

.roadmap-index {
  font-weight: 800;
  opacity: 0.45;
}

.status {
  font-size: 0.86rem;
  font-weight: 650;
  color: #5c676e;
}

footer {
  padding: 24px 0 64px;
  color: #5b656b;
  font-size: 0.92rem;
}