:root{--bg:#fff;--fg:#1a1a1a;--muted:#666;--accent:#c0392b;--card:#f7f5f2;--border:#e5e0da}
@media (prefers-color-scheme:dark){:root{--bg:#181818;--fg:#eee;--muted:#aaa;--accent:#e67e22;--card:#242424;--border:#333}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;line-height:1.8}
a{color:var(--accent)}
main,.site-header,.site-footer{max-width:760px;margin:0 auto;padding:1rem}
.site-header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}
.brand{font-weight:bold;font-size:1.2rem;text-decoration:none;color:var(--fg)}
.site-nav{display:flex;gap:1rem;align-items:center}
.nav-toggle{display:none;background:none;border:none;font-size:1.4rem;color:var(--fg);cursor:pointer}
.dropdown{position:relative}
.dropdown-menu{display:none;position:absolute;background:var(--bg);border:1px solid var(--border);padding:.5rem;flex-direction:column;min-width:8rem}
.dropdown:hover .dropdown-menu{display:flex}
@media (max-width:600px){
 .nav-toggle{display:block}
 .site-nav{display:none;flex-direction:column;position:absolute;top:3rem;right:1rem;background:var(--bg);border:1px solid var(--border);padding:1rem;z-index:10}
 .site-nav.open{display:flex}
 .dropdown-menu{position:static}
}
.hero{padding:2rem 0;text-align:center}
.cards{display:grid;gap:1rem}
.card{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:1rem}
.card-meta{color:var(--muted);font-size:.9rem}
.chip{display:inline-block;background:var(--border);border-radius:1rem;padding:0 .5rem;font-size:.8rem}
.meta{color:var(--muted);font-size:.9rem}
.pr-notice{color:var(--accent);font-weight:bold}
.video{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:1rem 0}
.video iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%}
th,td{border:1px solid var(--border);padding:.4rem .6rem;text-align:left}
img{max-width:100%;height:auto}
blockquote{border-left:3px solid var(--border);margin:1rem 0;padding:.2rem 1rem;color:var(--muted)}
pre{background:var(--card);padding:1rem;overflow-x:auto;border-radius:6px}
code{background:var(--card);padding:.1rem .3rem;border-radius:4px}
pre code{background:none;padding:0}
.post-nav{display:flex;justify-content:space-between;margin-top:2rem;gap:1rem}
.site-footer{border-top:1px solid var(--border);color:var(--muted);font-size:.9rem;text-align:center}
.site-footer nav{display:flex;justify-content:center;gap:1rem;margin-bottom:.5rem}