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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #fff;
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 1px solid #eee;
}
header h1 { font-size: 2rem; font-weight: 600; margin-bottom: 8px; }
header p { color: #666; font-size: 1rem; }

nav { margin-top: 20px; }
nav a {
  display: inline-block;
  color: #333;
  text-decoration: none;
  margin: 8px 6px;
  padding: 8px 16px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 0.9rem;
  transition: all 0.2s;
}
nav a:hover { background: #f5f5f5; border-color: #ccc; }

@media (max-width: 600px) {
  nav a { margin: 6px 4px; padding: 6px 12px; font-size: 0.85rem; }
}

main { min-height: 400px; }

h1, h2, h3 { margin-top: 2rem; margin-bottom: 1rem; font-weight: 600; }
h1 { font-size: 1.8rem; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.2rem; }
p { margin-bottom: 1rem; }

a { color: #333; text-decoration: underline; }
a:hover { color: #000; }

table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; }
th, td { padding: 12px; text-align: left; border-bottom: 1px solid #eee; }
th { font-weight: 600; background: #fafafa; }

img { max-width: 100%; height: auto; border-radius: 8px; }

.btn {
  display: inline-block;
  padding: 12px 24px;
  background: #333;
  color: #fff !important;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
  margin: 8px 8px 8px 0;
  transition: background 0.2s;
}
.btn:hover { background: #000; }

footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid #eee;
  text-align: center;
  color: #999;
  font-size: 0.85rem;
}

.lang-switch { text-align: center; margin-bottom: 2rem; color: #666; }
.lang-switch a { color: #666; text-decoration: none; }
.lang-switch a:hover { text-decoration: underline; }
.lang-switch .current { text-decoration: underline; font-weight: 600; }

.center { text-align: center; }

ul, ol { margin-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.5rem; }

.hero {
  text-align: center;
  padding: 2rem 1rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e9f0 100%);
  border-radius: 12px;
}
.hero-text {
  font-size: 1.2rem;
  line-height: 1.8;
  color: #222;
  font-weight: 500;
  margin: 0;
}