:root{--border:#e2e8f0;--ink:#0f172a;--muted:#475569;--accent:#0ea5e9;--accent-2:#1d4ed8;--container:1100px;--chip:#f1f5f9;--radius:12px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Noto Sans JP",sans-serif;line-height:1.8}.container{max-width:var(--container);margin:0 auto;padding:0 16px}.site-header{border-bottom:1px solid var(--border);background:#fff;position:sticky;top:0;z-index:50}.navbar{display:flex;align-items:center;justify-content:space-between;min-height:68px}.brand{display:flex;align-items:center;gap:10px;font-weight:800}.brand img{height:28px}.menu{display:flex;gap:16px;flex-wrap:wrap}.menu a{color:var(--ink);opacity:.85}.hero{padding:56px 0 16px}.hero h1{font-size:clamp(26px,4.5vw,40px);margin:0 0 6px}.hero p.lead{color:var(--muted);margin:0}.index{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0 8px}.index a{display:inline-block;background:var(--chip);border:1px solid var(--border);padding:8px 12px;border-radius:999px;font-weight:700;color:var(--ink)}.section{padding:36px 0;border-top:1px solid var(--border)}.section h2{font-size:clamp(22px,3.5vw,30px);margin:0 0 6px}.section p.lead{color:var(--muted);margin:0 0 16px}.grid{display:grid;gap:14px}.grid-4{grid-template-columns:repeat(4,1fr)}@media(max-width:980px){.grid-4{grid-template-columns:repeat(2,1fr)}}@media(max-width:560px){.grid-4{grid-template-columns:1fr}}.card{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff}.card .media{aspect-ratio:4/3;background:#f8fafc}.card img{width:100%;height:100%;object-fit:cover;display:block}.card .cap{padding:10px 12px;font-size:14px;color:var(--muted);font-weight:700}.card .excerpt{padding:0 12px 12px;color:#334155;font-size:14px}.footer{border-top:1px solid var(--border);padding:28px 0;color:#334155;font-size:14px;background:#fff}.badge{display:inline-block;background:#e0f2fe;color:#0369a1;border-radius:999px;padding:3px 8px;font-size:12px;font-weight:800}.btn{display:inline-block;padding:10px 14px;border-radius:10px;border:1px solid var(--border);font-weight:700}.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border:none}small.mono{font-family:ui-monospace,Menlo,Consolas,monospace;color:#64748b}