:root{color-scheme:light;--ink:#163029;--muted:#536b63;--line:#dce6de;--green:#235944;--paper:#fbfcf8}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","Noto Sans JP",sans-serif;line-height:1.9}main{max-width:850px;margin:auto;padding:56px 28px 24px}header{padding:32px 0 40px;border-bottom:1px solid var(--line)}.label{font-size:.72rem;font-weight:700;letter-spacing:.17em;color:var(--green)}h1{font-size:clamp(1.8rem,5vw,2.9rem);line-height:1.35;letter-spacing:-.03em;margin:20px 0 12px}h2{font-size:1.18rem;line-height:1.6;margin:0 0 15px}.lead{font-size:1.12rem;color:var(--muted);margin:0}section{padding:30px 0 4px}p{margin:0 0 16px}a{color:var(--green);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}.button{display:inline-block;border:1px solid #aec6b6;border-radius:8px;padding:10px 18px;margin:4px 0 18px;text-decoration:none;font-size:.95rem}.button:hover{background:#edf3ea}footer{border-top:1px solid var(--line);margin-top:38px;padding-top:24px;font-size:.8rem;color:var(--muted)}footer p{margin:0 0 5px}.date{font-size:.83rem;color:var(--muted);margin:16px 0 0}nav{font-size:.85rem}a:focus-visible{outline:3px solid #75a487;outline-offset:4px}@media(max-width:500px){main{padding:24px 22px}header{padding-top:25px;padding-bottom:30px}section{padding-top:25px}}