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:root {
  --accent: #4361EE;
  --accent-dark: #2D4BD4;
  --text: #0F172A;
  --text-2: #4B5563;
  --text-3: #94A3B8;
  --bg: #F5F7FF;
  --border: #E2E8F0;
  --white: #fff;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --max: 720px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.blog-top {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.blog-top-brand { font-weight: 800; font-size: 15px; color: var(--text); }
.blog-top-nav { font-size: 14px; color: var(--text-2); display: flex; gap: 18px; align-items: center; }
article.blog-article {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 24px 80px;
}
.blog-article h1 {
  font-size: clamp(1.45rem, 4vw, 2rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.blog-meta {
  font-size: 14px;
  color: var(--text-3);
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.blog-lead {
  font-size: 18px;
  color: var(--text-2);
  margin-bottom: 28px;
  line-height: 1.75;
}
.blog-article h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 36px 0 14px;
  color: var(--text);
}
.blog-article p { margin-bottom: 16px; color: var(--text-2); }
.blog-article ul, .blog-article ol { margin: 0 0 16px 1.2em; color: var(--text-2); }
.blog-article li { margin-bottom: 8px; }
.blog-callout {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  margin: 24px 0;
  font-size: 15px;
  color: var(--text-2);
  box-shadow: 0 2px 12px rgba(67,97,238,0.06);
}
.blog-callout strong { color: var(--text); }
.blog-cta {
  margin-top: 40px;
  padding: 28px;
  background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
  border-radius: 14px;
  border: 1px solid rgba(67,97,238,0.15);
}
.blog-cta h3 { font-size: 1.05rem; margin-bottom: 10px; color: var(--text); }
.blog-cta p { font-size: 15px; margin-bottom: 14px; }
.blog-cta .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: var(--white) !important;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 22px;
  border-radius: 8px;
  text-decoration: none !important;
}
.blog-cta .btn:hover { background: var(--accent-dark); }
.blog-footnote {
  margin-top: 32px;
  font-size: 12px;
  color: var(--text-3);
  line-height: 1.65;
}
.blog-related { margin-top: 28px; font-size: 14px; color: var(--text-2); }
.blog-related h3 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-3); margin-bottom: 10px; }
.blog-index { max-width: 900px; margin: 0 auto; padding: 40px 24px 80px; }
.blog-index h1 { font-size: 1.75rem; font-weight: 800; margin-bottom: 8px; }
.blog-index .sub { color: var(--text-2); margin-bottom: 36px; font-size: 16px; }
.blog-list { list-style: none; }
.blog-list li {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px 24px;
  margin-bottom: 14px;
  transition: box-shadow 0.2s;
}
.blog-list li:hover { box-shadow: var(--shadow-sm, 0 4px 20px rgba(67,97,238,0.08)); }
.blog-list a { color: var(--text); font-weight: 700; font-size: 1.05rem; text-decoration: none; display: block; margin-bottom: 6px; }
.blog-list a:hover { color: var(--accent); }
.blog-list .excerpt { font-size: 14px; color: var(--text-2); line-height: 1.65; }
.blog-tag { display: inline-block; font-size: 11px; font-weight: 600; color: var(--accent-dark); background: rgba(67,97,238,0.1); padding: 3px 10px; border-radius: 100px; margin-bottom: 8px; }
@media (max-width: 600px) {
  article.blog-article { padding-top: 32px; }
  body { font-size: 16px; }
}