:root {
  --brand: #A855F7;
  --brand-light: #F3E8FF;
  --brand-dark: #9333EA;
  --slate-800: #1E293B;
  --slate-600: #475569;
  --slate-500: #64748B;
  --slate-400: #94A3B8;
  --slate-200: #E2E8F0;
  --slate-100: #F1F5F9;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', 'Microsoft YaHei', sans-serif;
  color: var(--slate-800); background: #FAFAFA; line-height: 1.8; -webkit-font-smoothing: antialiased;
}

header.blog-header {
  background: white; border-bottom: 1px solid var(--slate-200); padding: 16px 0; position: sticky; top: 0; z-index: 10;
}
header.blog-header .wrap {
  max-width: 760px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
header.blog-header .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--slate-800); }
header.blog-header .logo {
  width: 36px; height: 36px; background: var(--brand-dark); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; padding: 9px;
}
header.blog-header .logo img { width: 100%; height: 100%; display: block; }
header.blog-header .brand span { font-weight: 700; font-size: 16px; }
header.blog-header .lang a { font-size: 13px; color: var(--slate-500); text-decoration: none; margin-left: 12px; font-weight: 500; }
header.blog-header .lang a:hover { color: var(--brand-dark); }
header.blog-header .lang a.active { color: var(--brand-dark); font-weight: 700; }

main.article, main.blog { max-width: 760px; margin: 0 auto; padding: 32px 24px 80px; }

.breadcrumb { font-size: 14px; color: var(--slate-400); margin-bottom: 24px; }
.breadcrumb a { color: var(--slate-500); text-decoration: none; }
.breadcrumb a:hover { color: var(--brand-dark); }
.breadcrumb .sep { margin: 0 8px; color: var(--slate-200); }

article h1 { font-size: 30px; font-weight: 800; line-height: 1.35; margin-bottom: 12px; letter-spacing: -.5px; }
article .meta { font-size: 14px; color: var(--slate-400); margin-bottom: 32px; }
article .body { font-size: 16px; color: var(--slate-600); }
article .body h2 { font-size: 21px; font-weight: 700; margin: 36px 0 12px; color: var(--slate-800); }
article .body h3 { font-size: 17px; font-weight: 700; margin: 28px 0 8px; color: var(--slate-800); }
article .body p { margin-bottom: 16px; }
article .body ul { margin: 8px 0 16px 22px; }
article .body li { margin-bottom: 6px; }
article .body strong { color: var(--slate-800); font-weight: 700; }
article .body hr { border: none; border-top: 1px solid var(--slate-200); margin: 32px 0; }
article .body a { color: var(--brand-dark); text-decoration: none; }
article .body a:hover { text-decoration: underline; }

aside.cta {
  margin-top: 48px; background: linear-gradient(135deg, #FAF5FF 0%, #F3E8FF 100%);
  border: 1px solid var(--slate-200); border-radius: 16px; padding: 32px; text-align: center;
}
aside.cta h2 { font-size: 20px; font-weight: 800; margin-bottom: 8px; color: var(--slate-800); }
aside.cta p { font-size: 15px; color: var(--slate-600); margin-bottom: 20px; }
aside.cta .cta-btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--slate-800); color: white; padding: 12px 32px; border-radius: 100px;
  text-decoration: none; font-size: 15px; font-weight: 600; transition: all .15s;
  box-shadow: 0 4px 14px rgba(0,0,0,.15);
}
aside.cta .cta-btn:hover { background: black; transform: translateY(-1px); }

main.blog h1 { font-size: 30px; font-weight: 800; margin-bottom: 8px; letter-spacing: -.5px; }
main.blog .blog-intro { font-size: 15px; color: var(--slate-500); margin-bottom: 32px; }
.post-list { display: grid; gap: 20px; }
.post-card {
  background: white; border: 1px solid var(--slate-200); border-radius: 16px; padding: 24px;
  text-decoration: none; color: inherit; display: block; transition: all .2s;
}
.post-card:hover { border-color: var(--brand); box-shadow: 0 4px 12px rgba(168,85,247,.08); }
.post-card h2 { font-size: 18px; font-weight: 700; margin-bottom: 6px; color: var(--slate-800); }
.post-card p { font-size: 14px; color: var(--slate-500); margin-bottom: 8px; line-height: 1.7; }
.post-card .date { font-size: 13px; color: var(--slate-400); }

footer {
  text-align: center; padding: 32px 24px; border-top: 1px solid var(--slate-200);
  font-size: 13px; color: var(--slate-400);
}
footer a { color: var(--slate-500); text-decoration: none; }
footer a:hover { color: var(--brand-dark); }
footer .icp { margin-top: 6px; }
footer .icp a { font-size: 12px; color: var(--slate-400); text-decoration: none; }

@media (max-width: 640px) {
  article h1 { font-size: 24px; }
  main.article, main.blog { padding: 24px 20px 64px; }
}