:root{
  --navy:#1b2a4a; --navy-deep:#13203a; --gold:#c9a227; --gold-soft:#e3c878;
  --ink:#2b2b2b; --sub:#666; --line:#e6e6e6; --bg:#f4f5f7; --card:#fff;
  --link:#1565c0;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.9;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--link);text-decoration:none} a:hover{text-decoration:underline}
img{max-width:100%;height:auto}

/* Header */
.site-header{background:var(--navy);color:#fff;border-bottom:3px solid var(--gold)}
.header-inner{max-width:1080px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:14px 20px;flex-wrap:wrap;gap:8px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:#fff;letter-spacing:.02em}
.logo:hover{text-decoration:none}
.logo .mark{width:34px;height:34px;border-radius:50%;background:var(--gold);display:grid;place-items:center;font-size:18px}
.gnav{display:flex;gap:2px;flex-wrap:wrap}
.gnav a{color:#e9edf4;font-size:13.5px;padding:6px 12px;border-radius:4px}
.gnav a:hover{background:rgba(255,255,255,.1);text-decoration:none}

/* Layout */
.wrap{max-width:1080px;margin:24px auto;padding:0 16px;display:grid;grid-template-columns:1fr 300px;gap:30px}
@media(max-width:880px){.wrap{grid-template-columns:1fr}}

.crumb{font-size:12px;color:var(--sub);margin-bottom:12px}
.crumb a{color:var(--sub)}

/* Article card */
.article{background:var(--card);border-radius:8px;box-shadow:0 1px 4px rgba(0,0,0,.06);overflow:hidden}
.eyecatch{position:relative}
.eyecatch img{width:100%;display:block}
.eyecatch .badge{position:absolute;left:14px;top:14px;background:var(--navy);color:#fff;font-size:12px;padding:5px 12px;border-radius:3px;font-weight:700}
.article-head{padding:26px 28px 0}
h1.title{font-size:25px;line-height:1.5;margin:0 0 14px;font-weight:800;color:var(--navy-deep)}
.meta-row{display:flex;align-items:center;gap:14px;font-size:12.5px;color:var(--sub);border-bottom:1px solid var(--line);padding-bottom:14px;margin-bottom:4px;flex-wrap:wrap}
.meta-row .cat-label{color:var(--sub)}
.share-x{margin-left:auto;background:#000;color:#fff;border-radius:4px;padding:4px 12px;font-size:12px}
.share-x:hover{text-decoration:none;opacity:.85}

/* TOC */
.toc{margin:24px 28px;background:#f7f8fa;border:1px solid var(--line);border-radius:6px;padding:16px 20px}
.toc-title{font-weight:700;color:var(--navy);margin-bottom:8px;font-size:15px}
.toc ol{margin:0;padding-left:22px;font-size:14px}
.toc ol ol{padding-left:18px;margin-top:4px}
.toc li{margin:5px 0} .toc a{color:#34495e}

/* Body */
.content{padding:6px 28px 30px}
.content h2{font-size:21px;color:var(--navy-deep);border-left:6px solid var(--gold);background:linear-gradient(90deg,#f3f5f8,transparent);padding:10px 0 10px 14px;margin:38px 0 16px;font-weight:800}
.content h3{font-size:18px;color:var(--navy-deep);border-bottom:2px solid var(--gold-soft);padding-bottom:6px;margin:30px 0 14px;font-weight:700}
.content h4{font-size:16px;color:var(--navy);margin:24px 0 10px;padding-left:12px;border-left:4px solid var(--navy);font-weight:700}
.content p{margin:14px 0}
.content strong{color:#c0392b;font-weight:700}
.content a{color:var(--link)}
.content ul{margin:14px 0;padding-left:0;list-style:none}
.content ul li{position:relative;padding-left:24px;margin:8px 0}
.content ul li::before{content:"";position:absolute;left:6px;top:11px;width:8px;height:8px;background:var(--gold);border-radius:50%}
.content ul ul{margin:8px 0}
.content ol{margin:14px 0;padding-left:26px}
.content ol li{margin:8px 0}
.content hr{border:0;border-top:1px dashed #ccc;margin:26px 0}
.content figure{margin:18px 0}
.content table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px;display:block;overflow-x:auto}
.content th{background:var(--navy);color:#fff;padding:10px 12px;text-align:left;font-weight:600;white-space:nowrap}
.content td{border:1px solid var(--line);padding:10px 12px}
.content tbody tr:nth-child(even){background:#f7f8fa}
.content blockquote{border-left:4px solid var(--gold-soft);background:#f7f8fa;margin:18px 0;padding:12px 18px;color:#444}

/* note CTA */
.note-cta{margin:28px;padding:22px 24px;background:linear-gradient(135deg,var(--navy),var(--navy-deep));border-radius:8px;color:#fff}
.note-cta h3{margin:0 0 10px;color:var(--gold-soft);font-size:17px;border:0;padding:0}
.note-cta p{margin:6px 0;font-size:14px;color:#dfe5ef}
.note-cta a.btn{display:inline-block;margin-top:12px;background:var(--gold);color:#1b2a4a;font-weight:700;padding:11px 22px;border-radius:6px;font-size:14px}
.note-cta a.btn:hover{text-decoration:none;background:var(--gold-soft)}

/* Author */
.author-box{margin:28px;border:1px solid var(--line);border-radius:8px;padding:20px;display:flex;gap:16px;align-items:flex-start;background:#fafbfc}
.author-box img{width:64px;height:64px;border-radius:50%;flex:none}
.author-box .name{font-weight:700;color:var(--navy);margin-bottom:4px}
.author-box .bio{font-size:13px;color:var(--sub);line-height:1.7}

.taglist{margin:0 28px 24px;display:flex;flex-wrap:wrap;gap:8px}
.tag{font-size:12px;background:#eef1f5;color:#46566f;padding:4px 11px;border-radius:14px}
.tag:hover{background:var(--navy);color:#fff;text-decoration:none}

/* Related */
.related{margin:0 28px 30px}
.related h2{font-size:17px;color:var(--navy);border-left:5px solid var(--gold);padding-left:10px;margin-bottom:14px}
.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:560px){.related-grid{grid-template-columns:1fr}}
.rcard{border:1px solid var(--line);border-radius:6px;padding:12px 14px;font-size:13px;line-height:1.6}
.rcard a{color:var(--navy-deep);font-weight:600}

/* Sidebar */
.side .widget{background:var(--card);border-radius:8px;box-shadow:0 1px 4px rgba(0,0,0,.05);margin-bottom:20px;overflow:hidden}
.side .wtitle{background:var(--navy);color:#fff;font-size:14px;font-weight:700;padding:11px 16px;border-bottom:2px solid var(--gold)}
.side ul{list-style:none;margin:0;padding:8px 16px}
.side ul li{padding:8px 0;border-bottom:1px dashed var(--line);font-size:13.5px}
.side ul li:last-child{border:0}
.side ul li a{color:var(--navy-deep)}
.side .profile{padding:20px;text-align:center}
.side .profile img{width:84px;height:84px;border-radius:50%}
.side .profile .pname{font-weight:700;color:var(--navy);margin:10px 0 6px}
.side .profile .pbio{font-size:12.5px;color:var(--sub);line-height:1.7;text-align:left}

/* Index */
.index-h1{font-size:22px;color:var(--navy-deep);border-left:6px solid var(--gold);padding-left:14px;margin:6px 0 20px}
.index-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:560px){.index-grid{grid-template-columns:1fr}}
.indexcard{display:block;background:var(--card);border-radius:8px;overflow:hidden;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.indexcard:hover{text-decoration:none;box-shadow:0 3px 10px rgba(0,0,0,.12);transform:translateY(-2px);transition:.2s}
.ic-thumb{position:relative}
.ic-thumb img{width:100%;display:block;aspect-ratio:16/9;object-fit:cover;background:#e9edf4}
.ic-badge{position:absolute;left:10px;top:10px;background:var(--navy);color:#fff;font-size:11px;padding:3px 9px;border-radius:3px;font-weight:700}
.ic-title{padding:12px 14px;font-size:14px;font-weight:700;color:var(--navy-deep);line-height:1.55}

/* Footer */
.site-footer{background:var(--navy-deep);color:#cfd6e2;margin-top:30px;padding:30px 16px}
.foot-inner{max-width:1080px;margin:0 auto;display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px;align-items:center}
.foot-nav a{color:#cfd6e2;font-size:13px;margin-right:18px}
.copy{font-size:12px;color:#7e8aa0;width:100%;text-align:center;margin-top:18px;border-top:1px solid #2b3a5a;padding-top:16px}