:root {
  --primary: #297ED3;
  --bg: #fafafa;
  --text: #1c1c1e;
  --muted: #666;
  --card-bg: #fff;
  --border: #e0e0e0;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1b1f;
    --text: #e6e1e5;
    --muted: #aaa;
    --card-bg: #2b2930;
    --border: #3a3a3c;
  }
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 0;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
header {
  background: var(--primary);
  color: #fff;
  padding: 40px 24px;
  text-align: center;
}
header h1 { font-size: 2rem; margin-bottom: 8px; }
header p { opacity: 0.9; font-size: 1.1rem; }
nav {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 16px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  background: var(--card-bg);
}
nav a {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
}
nav a:hover { background: var(--primary); color: #fff; text-decoration: none; }
.lang-switch { font-size: 0.85rem; }
main {
  max-width: 780px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}
h2 { margin: 32px 0 12px; color: var(--primary); font-size: 1.3rem; }
h3 { margin: 20px 0 8px; font-size: 1.05rem; }
p, ul, ol { margin-bottom: 12px; }
ul { padding-left: 20px; }
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin: 16px 0;
}
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 24px 0; }
.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.feature-card .icon { font-size: 2rem; margin-bottom: 8px; }
footer {
  text-align: center;
  padding: 24px;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}