*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;font-size:18px;line-height:1.7;color:#1a1a1a;background:#fff;max-width:100%;overflow-x:hidden}
main{max-width:760px;margin:0 auto;padding:0 20px}
article{padding-bottom:40px}
.site-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:900px;margin:0 auto;border-bottom:1px solid #e5e5e5}
.site-header .logo{text-decoration:none;font-size:1.2rem;font-weight:700;color:#1e3a8a}
.site-header nav{display:flex;gap:20px;list-style:none;margin:0;padding:0}
.site-header nav a{color:#1a1a1a;text-decoration:none;font-size:15px}
h1{font-size:2rem;line-height:1.2;margin:32px 0 16px;color:#0f172a}
h2{font-size:1.5rem;margin:36px 0 16px;color:#0f172a;border-bottom:2px solid #1e3a8a;padding-bottom:6px}
h3{font-size:1.2rem;margin:24px 0 12px;color:#334155}
p{margin-bottom:16px}
a{color:#2563eb}
strong{color:#0f172a}
ul,ol{margin:0 0 16px 24px}
li{margin-bottom:6px}
.article-meta{font-size:14px;color:#64748b;margin-bottom:20px}
.breadcrumb{font-size:14px;color:#64748b;margin:16px 0 0;max-width:760px;margin-left:auto;margin-right:auto;padding:0 20px}
.breadcrumb a{color:#64748b;text-decoration:none}
.breadcrumb a:hover{color:#1e3a8a}
.key-points{background:#eff6ff;border-left:4px solid #1e3a8a;padding:16px 20px;margin:20px 0 28px;border-radius:0 6px 6px 0;font-size:15px;line-height:1.6}
.key-points strong{display:block;margin-bottom:8px;font-size:16px}
.ad-slot{min-height:90px;margin:28px 0;text-align:center;overflow:hidden}
footer{border-top:1px solid #e5e5e5;padding:24px 20px;text-align:center;font-size:14px;color:#64748b;max-width:900px;margin:40px auto 0}
footer a{color:#1e3a8a;text-decoration:none;font-weight:600}
@media(max-width:640px){h1{font-size:1.5rem}h2{font-size:1.25rem}body{font-size:16px}}