:root{--ink:#1c2430;--mute:#5d6977;--line:#e3e7eb;--bg:#ffffff;--soft:#f5f7f9;--acc:#0f766e;--acc2:#fde68a}
*{box-sizing:border-box}
html{font-size:16px}
body{margin:0;font-family:"Noto Sans JP",system-ui,-apple-system,"Hiragino Sans","Yu Gothic",sans-serif;color:var(--ink);background:var(--bg);line-height:1.9;-webkit-font-smoothing:antialiased}
a{color:var(--acc);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:baseline;gap:14px;padding:22px 0 18px}
.brand a{color:var(--ink);font-weight:700;font-size:1.35rem;letter-spacing:.02em}
.brand small{color:var(--mute);font-size:.8rem}
nav.top{display:flex;gap:18px;padding-bottom:14px;font-size:.9rem}
nav.top a{color:var(--mute)}
.hero{padding:44px 0 30px;border-bottom:1px solid var(--line)}
.hero h1{font-size:1.9rem;line-height:1.4;margin:0 0 12px;letter-spacing:.01em}
.hero p{color:var(--mute);margin:0;max-width:600px}
.eyebrow{display:inline-block;font-size:.72rem;letter-spacing:.14em;color:var(--acc);font-weight:700;border-bottom:2px solid var(--acc2);padding-bottom:2px;margin-bottom:10px}
.grid{display:grid;grid-template-columns:1fr;gap:18px;padding:28px 0}
.card{display:block;border:1px solid var(--line);border-left:5px solid var(--acc);padding:18px 20px;color:var(--ink);background:#fff;transition:background .15s}
.card:hover{background:var(--soft);text-decoration:none}
.card .cat{font-size:.72rem;color:var(--acc);font-weight:700;letter-spacing:.1em}
.card h3{margin:6px 0 6px;font-size:1.08rem;line-height:1.5}
.card p{margin:0;color:var(--mute);font-size:.92rem}
.card time{font-size:.78rem;color:var(--mute)}
article{padding:40px 0}
article h1{font-size:1.75rem;line-height:1.45;margin:8px 0 10px}
article .meta{color:var(--mute);font-size:.85rem;margin-bottom:32px}
article h2{font-size:1.3rem;margin:44px 0 14px;padding-left:12px;border-left:4px solid var(--acc)}
article h3{font-size:1.08rem;margin:28px 0 8px}
article p{margin:0 0 1.2em}
article ul,article ol{padding-left:1.4em}
article li{margin-bottom:.4em}
table{border-collapse:collapse;width:100%;margin:16px 0 24px;font-size:.92rem}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
th{background:var(--soft);font-weight:700}
.note{background:var(--soft);border-left:4px solid var(--acc2);padding:14px 18px;margin:24px 0;font-size:.92rem}
.box{border:1px solid var(--line);padding:18px 20px;margin:24px 0}
.box strong{display:block;margin-bottom:6px}
.cta{display:inline-block;background:var(--acc);color:#fff;padding:12px 22px;border-radius:4px;font-weight:700}
.cta:hover{text-decoration:none;opacity:.92}
.related{border-top:1px solid var(--line);padding-top:24px;margin-top:48px}
.related h4{margin:0 0 10px;font-size:.85rem;color:var(--mute);letter-spacing:.1em}
.related ul{list-style:none;padding:0;margin:0}
.related li{margin-bottom:6px}
footer{border-top:1px solid var(--line);margin-top:40px;padding:28px 0 40px;font-size:.82rem;color:var(--mute)}
footer nav{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:12px}
footer nav a{color:var(--mute)}
.disc{font-size:.78rem;color:var(--mute);border:1px dashed var(--line);padding:10px 14px;margin:0 0 28px}
@media(min-width:720px){.grid{grid-template-columns:1fr 1fr}}