:root {
  --ink: #1b1f24;
  --muted: #52606d;
  --accent: #1c5b4a;
  --accent-tint: #e6f2ee;
  --bg: #fdfdfb;
  --surface: #ffffff;
  --border: #e2e6e4;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eceef0;
    --muted: #a7b0b8;
    --accent: #6fceb4;
    --accent-tint: #16241f;
    --bg: #14171a;
    --surface: #1b1f23;
    --border: #2a2f34;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 0;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.brand-name {
  font-weight: 600;
  font-size: 1.1rem;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

.lede {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0;
}

.module {
  margin-top: 2.25rem;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.module h2 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  color: var(--accent);
}

.module p {
  margin: 0;
  color: var(--ink);
}

.module-next {
  background: var(--accent-tint);
  border-color: transparent;
}

.status {
  margin-top: 2.25rem;
  padding: 1rem 1.25rem;
  border: 1px dashed var(--border);
  border-radius: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.status p {
  margin: 0;
}

.site-footer {
  max-width: 40rem;
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0;
}