:root {
  --main-color: #4e54c8;
  --accent-color: #8f94fb;
  --bg: #f9f9f9;
  --text: #222;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  background: linear-gradient(to right, var(--main-color), var(--accent-color));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 3rem;
  margin-bottom: 10px;
}

nav a {
  margin: 0 10px;
  text-decoration: none;
  color: var(--main-color);
  font-weight: bold;
}

main {
  max-width: 800px;
  margin: 0 auto;
}

section {
  margin-bottom: 40px;
}

section h2 {
  font-size: 1.8rem;
  border-bottom: 2px solid var(--main-color);
  margin-bottom: 10px;
}

details summary {
  cursor: pointer;
  padding: 10px;
  background: #eee;
  border-radius: 5px;
}

footer {
  text-align: center;
  margin-top: 50px;
  font-size: 0.9rem;
  color: #777;
}

code {
    font-size: 1.5rem;
}