* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif; line-height: 1.8; color: #333; background: #f8f9fa; }
.container { max-width: 860px; margin: 0 auto; padding: 0 20px; }

header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: #fff; padding: 50px 0; text-align: center; }
header h1 { font-size: 2em; margin-bottom: 8px; }
header .subtitle { font-size: 1em; opacity: 0.85; }

nav { background: #fff; border-bottom: 1px solid #e0e0e0; position: sticky; top: 0; z-index: 100; }
nav a { display: inline-block; padding: 12px 18px; color: #555; text-decoration: none; font-size: 0.95em; }
nav a:hover { color: #667eea; }
nav a.current { color: #667eea; font-weight: 600; }

main { padding: 30px 0; }
section { margin-bottom: 30px; }
h2 { font-size: 1.4em; margin-bottom: 20px; color: #222; border-left: 4px solid #667eea; padding-left: 12px; }

.article-card { background: #fff; border-radius: 8px; padding: 24px; margin-bottom: 16px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); transition: transform 0.2s; }
.article-card:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.article-card h3 { font-size: 1.2em; margin-bottom: 8px; }
.article-card h3 a { color: #222; text-decoration: none; }
.article-card h3 a:hover { color: #667eea; }
.article-card p { color: #666; margin-bottom: 8px; }
.article-card .meta { font-size: 0.85em; color: #999; }

/* Article content */
.article-body { background: #fff; border-radius: 8px; padding: 40px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.article-body h1 { font-size: 1.8em; margin-bottom: 10px; line-height: 1.4; }
.article-body .meta { color: #999; font-size: 0.9em; margin-bottom: 25px; padding-bottom: 20px; border-bottom: 1px solid #e0e0e0; }
.article-body h2 { font-size: 1.35em; margin: 30px 0 15px; border: none; padding-left: 0; }
.article-body h3 { font-size: 1.15em; margin: 22px 0 10px; color: #444; }
.article-body p { color: #444; margin-bottom: 14px; }
.article-body ul, .article-body ol { padding-left: 24px; margin-bottom: 16px; }
.article-body li { margin-bottom: 8px; color: #444; }
.article-body .cta-box { background: #f0f4ff; border: 1px solid #d0d9ff; border-radius: 8px; padding: 20px; margin: 24px 0; text-align: center; }
.article-body .cta-box p { color: #555; }
.article-body .cta-box a { display: inline-block; background: #667eea; color: #fff; padding: 12px 28px; border-radius: 6px; text-decoration: none; font-weight: 600; margin-top: 10px; }
.article-body .cta-box a:hover { background: #5568d9; }
.article-body blockquote { border-left: 4px solid #667eea; padding: 12px 20px; margin: 20px 0; background: #f8f9ff; color: #555; }
.article-body blockquote p { margin: 0; }
.article-body table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.article-body th, .article-body td { border: 1px solid #e0e0e0; padding: 10px 14px; text-align: left; }
.article-body th { background: #f0f4ff; font-weight: 600; }
.article-body .back-link { margin-bottom: 20px; display: inline-block; color: #667eea; text-decoration: none; }
.article-body .back-link:hover { text-decoration: underline; }

footer { text-align: center; padding: 30px 0; color: #999; font-size: 0.85em; border-top: 1px solid #e0e0e0; }

@media (max-width: 600px) {
  header { padding: 30px 0; }
  header h1 { font-size: 1.5em; }
  .article-body { padding: 20px; }
}