:root {
  --color-bg: #faf8f5;
  --color-text: #1f2a26;
  --color-primary: #2f5d50;
  --color-primary-dark: #1f4238;
  --color-accent: #e8ddc8;
  --color-card-bg: #ffffff;
  --color-border: #e3ddd2;
  --max-width: 880px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #15201c;
    --color-text: #eef0ee;
    --color-primary: #7fc9af;
    --color-primary-dark: #a7ddc6;
    --color-accent: #233330;
    --color-card-bg: #1c2824;
    --color-border: #2b3a35;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

h1, h2, h3 {
  line-height: 1.25;
  color: var(--color-primary-dark);
}

.site-header {
  padding: 1.5rem 0;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary-dark);
}

.hero {
  padding: 3rem 0 3.5rem;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 0 0 1rem;
}

.lead {
  font-size: 1.1rem;
  max-width: 36rem;
  margin: 0 0 1.75rem;
}

.cta {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  transition: background 0.15s ease;
}

.cta:hover,
.cta:focus {
  background: var(--color-primary-dark);
}

.course, .contact {
  padding: 2.5rem 0;
  border-top: 1px solid var(--color-border);
}

.contact .email {
  font-size: 1.1rem;
  font-weight: 600;
}

.contact a {
  color: var(--color-primary);
}

.site-footer {
  padding: 2rem 0 3rem;
  font-size: 0.85rem;
  opacity: 0.7;
}

.course h2 {
  margin: 0 0 0.25rem;
}

.subtitle {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
}

.course p {
  max-width: 40rem;
}

.lead + .lead {
  margin-top: -0.75rem;
}