:root {
  --accent: #448aff;
  --text: #1f1f1f;
  --bg: #f7f9fc;
  --radius: 12px;
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}
header {
  background: white;
  box-shadow: var(--shadow);
  padding: 2rem 0;
  margin-bottom: 2rem;
  text-align: center;
}
h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--accent);
}
.subtitle {
  font-size: 18px;
  margin-top: 0.5rem;
  color: #555;
}
nav {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  transition: 0.2s;
}
nav a:hover,
nav a.active {
  color: var(--accent);
  font-weight: 600;
}
main section {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}
h2 {
  font-size: 24px;
  margin-bottom: 1rem;
  color: var(--accent);
}
ul {
  list-style: none;
  padding-left: 0;
}
ul li {
  margin-bottom: 0.5rem;
}
.btn {
  display: inline-block;
  margin-top: 1rem;
  background-color: var(--accent);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: 0.3s;
}
.btn:hover {
  background-color: #005ecb;
}
footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 14px;
  color: #777;
}