:root{
  --bg-0:#ffffff; --bg-1:#f4f8fb; --line:#dbe4ec;
  --text-0:#132433; --text-1:#5c7182; --text-2:#8a9aa8;
  --heat:#1f6fa8; --heat-tint:#eaf3fa;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg-0);color:var(--text-0);font-family:Inter,"Hiragino Sans","Noto Sans JP",sans-serif;line-height:1.9;-webkit-font-smoothing:antialiased}
a{color:var(--heat)}
.wrap{max-width:760px;margin:0 auto;padding:0 16px}
header{border-bottom:1px solid var(--line);background:rgba(255,255,255,.92);backdrop-filter:blur(8px);position:sticky;top:0;z-index:10}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;max-width:1080px}
header img{height:40px;width:auto;display:block}
.btn{display:inline-block;background:var(--heat);color:#fff;text-decoration:none;font-weight:600;font-size:14px;padding:10px 18px;border-radius:4px}
.eyebrow{font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.12em;color:var(--heat);text-transform:uppercase}
h1{font-family:"Space Grotesk","Hiragino Sans",sans-serif;font-size:clamp(24px,5vw,34px);line-height:1.4;margin:8px 0 12px}
.meta{color:var(--text-2);font-size:13px;font-family:"IBM Plex Mono",monospace}
main{padding:40px 0 80px}
.post-list{list-style:none;margin-top:32px;border-top:1px solid var(--line)}
.post-list li{border-bottom:1px solid var(--line)}
.post-list a{display:block;padding:20px 0;text-decoration:none;color:inherit}
.post-list h2{font-size:18px;line-height:1.5;margin:4px 0}
.post-list p{color:var(--text-1);font-size:14px}
.empty{color:var(--text-1);margin-top:32px}
article h2{font-size:22px;line-height:1.5;margin:48px 0 16px;padding-left:12px;border-left:3px solid var(--heat)}
article h3{font-size:18px;margin:32px 0 12px}
article p{margin:0 0 20px}
article ul,article ol{margin:0 0 20px 1.4em}
article img{max-width:100%;height:auto;border-radius:4px}
.note{background:var(--bg-1);border:1px solid var(--line);border-radius:4px;padding:16px 20px;font-size:14px;color:var(--text-1);margin:24px 0}
.cta-box{background:var(--heat-tint);border-radius:6px;padding:28px 24px;text-align:center;margin-top:56px}
.cta-box p{margin-bottom:16px;font-weight:600}
.cta-box .sub{display:block;margin-top:14px;font-size:14px}
footer{border-top:1px solid var(--line);padding:24px 0;font-size:13px;color:var(--text-2)}
footer .wrap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
footer a{color:inherit}