:root {
  --background: #f4f6fa;
  --surface: #ffffff;
  --text: #16202f;
  --muted: #5a6b84;
  --accent: #1a5fd0;
  --border: #d9e0ec;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 18px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

main { max-width: 1280px; margin: 0 auto; padding: 80px 32px; }
.eyebrow { margin: 0; color: var(--accent); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; font-size: .85rem; }
h1 { margin: .1em 0; font-size: clamp(2.5rem, 7vw, 5rem); letter-spacing: -.04em; line-height: 1.05; }
h2 { margin: 3.2rem 0 1rem; font-size: 1.6rem; }
.lead { max-width: 760px; font-size: 1.3rem; color: var(--muted); }
.courses { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; }
.course { display: block; padding: 28px; border: 1px solid var(--border); border-radius: 18px; background: var(--surface); color: inherit; text-decoration: none; box-shadow: 0 1px 3px rgba(20, 35, 60, .07); }
a.course:hover, a.course:focus-visible { border-color: var(--accent); box-shadow: 0 8px 28px rgba(26, 95, 208, .16); transform: translateY(-2px); }
.course h3 { margin: .35rem 0; font-size: 1.8rem; }
.course p { color: var(--muted); }
.tag { color: var(--accent); font-size: .84rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
.open { color: var(--accent); font-weight: 700; }
.planned { opacity: .7; }
.how { max-width: 900px; padding: 4px 24px; border-left: 4px solid var(--accent); background: #eaf1fd; }
.how h2 { margin-top: 1.2rem; }

@media (max-width: 600px) { main { padding: 48px 20px; } }