:root {
  color-scheme: dark;
  --bg: #0d2b45;
  --panel: #102a43;
  --text: #e2e8f0;
  --muted: #98a6c4;
  --azure: #3ecbff;
  --border: rgba(62, 203, 255, 0.35);
  --shadow: 0 16px 36px rgba(5, 8, 20, 0.35);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 820px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 4.5rem;
}

header {
  margin-bottom: 2rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.75rem;
  color: var(--azure);
  margin: 0 0 0.6rem;
}

.subtitle {
  color: var(--muted);
  max-width: 65ch;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.lesson-list {
  padding-left: 1.2rem;
  display: grid;
  gap: 0.5rem;
}

.lesson-list a {
  color: var(--azure);
  text-decoration: none;
}

.lesson-list a:hover {
  text-decoration: underline;
}

.lesson-list span {
  color: var(--muted);
}