:root{
  --bg:#FFFFFF;--alt:#F4F6FA;--alt2:#EEF2F8;
  --ink:#101A2B;--ink-mut:#55607A;--ink-soft:#8A94A6;
  --brand:#123C82;--brand-2:#2E6BD6;--brand-wash:#EAF0FB;--pos:#12946A;--pos-wash:#E6F5EF;--amber:#B4801F;
  --line:#E4E9F1;--line-2:#D5DCE7;
  --code-bg:#0d1c33;--code-fg:#d9e2f1;--code-mut:#7f90ad;--code-str:#9fd0a8;
  --sans:"Hiragino Kaku Gothic ProN","Yu Gothic Medium","Yu Gothic",Meiryo,system-ui,sans-serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;--measure:40em;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.95;-webkit-font-smoothing:antialiased;font-feature-settings:"palt" 1}
a{color:var(--brand-2);text-decoration:none}a:hover{text-decoration:underline}
.mono-t{font-family:var(--mono)}
header.bar{border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.93);backdrop-filter:blur(8px);z-index:20}
.bar-in{max-width:1080px;margin:0 auto;padding:15px 24px;display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:800;letter-spacing:.1em;color:var(--brand);display:flex;align-items:center;gap:.5em;font-size:1.05rem}
.brand .dot{width:7px;height:7px;border-radius:50%;background:var(--brand-2)}
.brand small{font-weight:600;color:var(--ink-soft);letter-spacing:.14em;font-family:var(--mono);font-size:.64rem}
.bar-in .home{font-size:.85rem;color:var(--ink-mut);cursor:pointer;background:none;border:none;font-family:var(--sans)}
/* index */
#index .hero{border-bottom:1px solid var(--line);background:linear-gradient(180deg,#fff,var(--alt))}
#index .hero-in{max-width:1080px;margin:0 auto;padding:60px 24px 46px}
#index .eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:var(--brand-2);font-weight:600}
#index h1{font-size:clamp(1.8rem,4vw,2.7rem);line-height:1.4;margin:.5em 0 .3em;letter-spacing:.01em}
#index .hero-in p{color:var(--ink-mut);max-width:34em;line-height:1.85;margin:0}
.grid{max-width:1080px;margin:0 auto;padding:44px 24px 70px;display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.pcardl{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 26px 24px;transition:transform .15s,box-shadow .2s,border-color .2s;color:inherit}
.pcardl:hover{transform:translateY(-2px);box-shadow:0 18px 44px -28px rgba(18,60,130,.4);border-color:var(--line-2);text-decoration:none}
.pcardl .row{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.pcardl .cat{font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;font-weight:700}
.pcardl .no{font-family:var(--mono);font-size:.72rem;color:var(--ink-soft)}
.pcardl h3{margin:0 0 8px;font-size:1.16rem;line-height:1.5;color:var(--ink)}
.pcardl p{margin:0;color:var(--ink-mut);font-size:.92rem;line-height:1.75}
.pcardl .read{margin-top:14px;font-family:var(--mono);font-size:.7rem;color:var(--ink-soft)}
@media(max-width:720px){.grid{grid-template-columns:1fr}}
/* article */
.post{display:none;max-width:var(--measure);margin:0 auto;padding:22px 24px 60px}
.post.show{display:block}
.backwrap{max-width:var(--measure);margin:0 auto;padding:20px 24px 0}
.back{font-size:.85rem;font-family:var(--mono);color:var(--ink-mut);cursor:pointer;background:none;border:none;padding:0}
.back:hover{color:var(--brand)}
.post .tag{display:inline-block;font-family:var(--mono);font-size:.7rem;letter-spacing:.16em;color:var(--brand-2);background:var(--brand-wash);padding:.4em .8em;border-radius:999px;text-transform:uppercase;margin-top:14px}
.post h1{font-size:clamp(1.7rem,3.6vw,2.5rem);line-height:1.45;margin:.5em 0 .35em;text-wrap:balance;letter-spacing:.01em}
.post .psub{color:var(--ink-mut);font-size:1.06rem;line-height:1.85;margin:0 0 18px}
.post .meta{color:var(--ink-soft);font-size:.85rem;border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:8px}
.post h2{font-size:clamp(1.3rem,2.5vw,1.7rem);line-height:1.5;margin:2.2em 0 .2em;letter-spacing:.01em}
.post h2 .eb{display:block;font-family:var(--mono);font-size:.7rem;letter-spacing:.18em;color:var(--brand-2);margin-bottom:.5em;font-weight:600;text-transform:uppercase}
.post h3{font-size:1.12rem;margin:1.6em 0 .1em}
.post p{margin:1.1em 0;color:#1c2740}
.post strong{font-weight:700}
.post ul,.post ol{margin:1.1em 0;padding-left:1.4em;color:#1c2740}
.post li{margin:.5em 0}
.post .lead{font-size:1.12rem;line-height:1.9;color:var(--ink);border-left:3px solid var(--brand-2);padding:.2em 0 .2em 1em;margin:1.5em 0}
.callout{background:var(--alt);border:1px solid var(--line);border-radius:10px;padding:20px 22px;margin:1.6em 0}
.callout .k{font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;color:var(--brand);font-weight:700;text-transform:uppercase}
.callout p{margin:.4em 0 0;font-size:.96rem}
.code{background:var(--code-bg);border-radius:10px;margin:1.6em 0;overflow:hidden;font-family:var(--mono);font-size:.82rem;line-height:1.85}
.code .cbar{display:flex;justify-content:space-between;padding:9px 16px;border-bottom:1px solid rgba(255,255,255,.08);color:var(--code-mut);font-size:.7rem;letter-spacing:.06em}
.code pre{margin:0;padding:16px 18px;overflow-x:auto;color:var(--code-fg)}
.code .c{color:var(--code-mut)}.code .s{color:var(--code-str)}
figure{margin:2em 0;background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px 20px 12px}
figure .fw{overflow-x:auto}
figure svg{display:block;max-width:100%;height:auto;margin:0 auto}
figcaption{margin-top:12px;color:var(--ink-mut);font-size:.82rem;text-align:center;line-height:1.7}
figcaption b{color:var(--brand)}
.next{background:var(--alt);border:1px solid var(--line);border-radius:12px;padding:22px 24px;margin:2.2em 0 0}
.next .k{font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;color:var(--brand-2)}
.next h3{margin:.35em 0 .3em;font-size:1.1rem}.next p{margin:0;color:var(--ink-mut);font-size:.92rem}
svg text{font-family:var(--sans)}
footer{border-top:1px solid var(--line);margin-top:20px}
.foot-in{max-width:1080px;margin:0 auto;padding:32px 24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;color:var(--ink-soft);font-size:.85rem}
.foot-in .brand{color:var(--brand);font-size:1rem}

.skip-link{position:absolute;left:8px;top:-48px;z-index:300;background:#E81414;color:#fff;padding:8px 16px;border-radius:0 0 8px 8px;font-weight:700;font-size:.85rem;text-decoration:none;transition:top .15s}
.skip-link:focus{top:0}