:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #0ea5e9;
  --border: #e2e8f0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: linear-gradient(180deg, #e8f4fc 0%, var(--bg) 40%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.55;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  background: var(--surface);
  min-height: 100vh;
  box-shadow: 0 0 0 1px var(--border);
}

.brand {
  margin: 0 0 0.35rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  font-size: 1.5rem;
  color: var(--accent);
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.65rem;
  letter-spacing: -0.03em;
}

h2 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.05rem;
}

.meta {
  color: var(--muted);
  margin: 0 0 1.25rem;
  font-size: 0.92rem;
}

p, li { font-size: 0.98rem; color: #334155; }

ul, ol { padding-left: 1.2rem; }

.btn {
  display: inline-block;
  margin: 0.25rem 0 0.5rem;
  padding: 0.7rem 1.25rem;
  background: var(--accent);
  color: #ffffff;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}

.btn:hover { opacity: 0.92; }

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.links a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.links a:hover { text-decoration: underline; }

@media (min-width: 800px) {
  body { padding: 2rem 1rem; }
  main {
    min-height: auto;
    border-radius: 16px;
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
  }
}