:root{--ink:#0f2238;--ink2:#33475b;--muted:#6b7c93;--line:#e4ebf3;--brand:#2563eb;--brand2:#06b6d4;--radius:14px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:#fff;font-family:"Segoe UI","Hiragino Kaku Gothic ProN","Yu Gothic UI",Meiryo,sans-serif;line-height:1.9;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}

.bt{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bt .in{max-width:1080px;margin:0 auto;padding:0 20px;height:58px;display:flex;align-items:center;gap:12px}
.bt .logo{display:flex;align-items:center;gap:9px;font-weight:900;font-size:17px;color:var(--ink)}
.bt .logo .mk{width:30px;height:33px;flex:0 0 30px}
.bt .logo small{display:block;font-size:8px;font-weight:700;color:var(--muted);letter-spacing:1.5px;margin-top:-2px}
.bt .sp{flex:1}
.bt a.lnk{font-size:13.5px;font-weight:700;color:var(--ink2)}
.bt a.lnk:hover{color:var(--brand)}
.bt a.cta{font-size:13px;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand2));padding:9px 16px;border-radius:999px;box-shadow:0 6px 16px rgba(37,99,235,.28)}
@media(max-width:560px){.bt a.lnk{display:none}}

.wrap{max-width:760px;margin:0 auto;padding:0 20px}
.post-head{padding:40px 0 6px}
.post-head .date{font-size:13px;color:var(--muted);font-weight:700}
.post-head h1{font-size:32px;line-height:1.42;margin:10px 0 8px;letter-spacing:-.3px}
.post{padding:14px 0 10px;font-size:16.5px;color:#23364d}
.post h2{font-size:23px;margin:40px 0 14px;padding-top:10px;line-height:1.5;letter-spacing:-.2px;border-top:1px solid var(--line)}
.post h3{font-size:18px;margin:28px 0 10px}
.post p{margin:0 0 20px}
.post ul,.post ol{margin:0 0 22px;padding-left:1.4em}
.post li{margin:9px 0}
.post strong{font-weight:800;color:var(--ink);background:linear-gradient(transparent 65%,#dbeeff 65%)}
.post a{text-decoration:underline}
.post blockquote{border-left:3px solid var(--brand);margin:0 0 22px;padding:6px 0 6px 18px;color:var(--ink2)}
.post hr{border:none;border-top:1px solid var(--line);margin:34px 0}
.post code{background:#eef2f7;padding:2px 6px;border-radius:6px;font-size:.92em}

.cta-box{background:linear-gradient(135deg,#0f1622,#16263c);color:#e8eef6;border-radius:18px;padding:28px 26px;margin:38px 0;text-align:center}
.cta-box h3{font-size:19px;color:#fff;margin:0 0 8px}
.cta-box p{color:#a9bdd6;font-size:14px;margin:0 0 16px;line-height:1.75}
.cta-box .btn{display:inline-block;background:#fff;color:var(--brand);font-weight:800;padding:12px 22px;border-radius:999px;font-size:14.5px}
.cta-box .btn:hover{transform:translateY(-2px)}

.pn{display:flex;justify-content:space-between;gap:12px;margin:30px 0}
.pn a{flex:1;border:1px solid var(--line);border-radius:12px;padding:13px 16px;color:var(--ink2);font-weight:700;font-size:13.5px;line-height:1.45}
.pn a.next{text-align:right}
.pn a:hover{border-color:var(--brand);color:var(--brand)}
.pn .ph{font-size:11px;color:var(--muted);display:block;margin-bottom:3px;font-weight:700}

.blog-hero{padding:44px 0 6px}
.blog-hero h1{font-size:32px;margin:12px 0 8px;letter-spacing:-.3px}
.blog-hero p{color:var(--ink2);font-size:16px;max-width:660px;margin:0}
.posts{display:grid;gap:16px;padding:26px 0 6px}
.pcard{display:block;border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;box-shadow:0 2px 8px rgba(20,50,90,.05);transition:.15s;color:inherit}
.pcard:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(20,50,90,.1);border-color:#cfe0f5}
.pcard .date{font-size:12.5px;color:var(--muted);font-weight:700}
.pcard h2{font-size:19px;margin:6px 0 8px;color:var(--ink);line-height:1.5}
.pcard p{color:var(--ink2);font-size:14px;margin:0;line-height:1.7}
.pcard .more{color:var(--brand);font-weight:800;font-size:13.5px;margin-top:12px;display:inline-block}

.bf{border-top:1px solid var(--line);margin-top:44px;padding:26px 20px;text-align:center;color:var(--muted);font-size:13px}
.bf a{font-weight:700}
@media(max-width:600px){.post-head h1{font-size:25px}.post{font-size:16px}.blog-hero h1{font-size:26px}.post h2{font-size:20px}}