:root {
  --primary-color: #007AFF;
  --bg-color: #ffffff;
  --text-color: #1d1d1f;
  --secondary-text: #86868b;
  --card-bg: #f5f5f7;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #000000;
    --text-color: #f5f5f7;
    --secondary-text: #a1a1a6;
    --card-bg: #1c1c1e;
  }
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 60px;
}

.logo {
  width: 120px;
  height: 120px;
  border-radius: 24px;
  margin-bottom: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

h1 {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 20px;
  color: var(--secondary-text);
  max-width: 600px;
  margin: 0 auto;
}

section {
  margin-bottom: 60px;
}

h2 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 20px;
}

ul {
  list-style: none;
}

li {
  margin-bottom: 15px;
  padding-left: 30px;
  position: relative;
}

li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
}

.card {
  background-color: var(--card-bg);
  padding: 30px;
  border-radius: 18px;
  margin-bottom: 20px;
}

.footer {
  text-align: center;
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid var(--card-bg);
  font-size: 14px;
  color: var(--secondary-text);
}

.footer-links {
  margin-bottom: 20px;
}

.footer-links a {
  color: var(--primary-color);
  text-decoration: none;
  margin: 0 15px;
  transition: opacity 0.2s;
}

.footer-links a:hover {
  opacity: 0.7;
}

.btn {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  padding: 12px 24px;
  border-radius: 980px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.2s, background-color 0.2s;
}

.btn:hover {
  transform: scale(1.05);
  background-color: #0062cc;
}

@media (max-width: 600px) {
  h1 {
    font-size: 36px;
  }
}