:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --accent: #2563eb;
  --border: #dbe2ea;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Verdana, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* HERO */

.hero {
  text-align: center;
  padding: 5rem 1rem 4rem;
  background: linear-gradient(180deg, #eef4ff 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  font-size: 3.5rem;
  margin: 0;
}

.tagline {
  font-size: 1.3rem;
  margin: 1rem 0 2rem;
  color: #374151;
}

/* BUTTON */

.button {
  display: inline-block;
  padding: 0.8rem 1.4rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 0.6rem;
  font-weight: bold;
}

/* LAYOUT */

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

/* SECTIONS */

section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 1.2rem;
}

/* CTA */

.cta {
  text-align: center;
}

/* CODE */

pre {
  background: #0f172a;
  color: #e5eefc;
  padding: 1rem;
  border-radius: 0.7rem;
  overflow-x: auto;
}

/* FOOTER */

.footer {
  text-align: center;
  padding: 2rem 1rem;
  color: #6b7280;
}