:root{--ink:#20332f;--muted:#5f6f69;--line:#d7e3dd;--paper:#fbfdfb;--accent:#2c7667;--warm:#f2f6e9}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",sans-serif;line-height:1.85}header,main,footer{max-width:1080px;margin:auto;padding:0 24px}header{padding-top:34px;padding-bottom:22px;border-bottom:1px solid var(--line)}.brand{color:var(--ink);font-size:1.55rem;font-weight:750;text-decoration:none}header p{margin:.2rem 0 1rem;color:var(--muted)}nav{display:flex;flex-wrap:wrap;gap:.5rem}nav a{padding:.2rem .65rem;border:1px solid var(--line);border-radius:99px;color:var(--ink);text-decoration:none;font-size:.9rem}main{padding-top:42px;padding-bottom:52px;max-width:820px}h1{font-size:clamp(1.8rem,5vw,2.65rem);line-height:1.35;margin:0 0 1.5rem}h2{margin-top:2.5rem;line-height:1.45}h3{margin-top:1.6rem}.lead{font-size:1.15rem;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:25px 0}.card{display:block;padding:18px;background:#fff;border:1px solid var(--line);border-radius:12px;color:var(--ink);text-decoration:none}.card small{color:var(--muted)}.notice{padding:18px 20px;border-left:4px solid var(--accent);background:var(--warm);border-radius:6px}.related{margin-top:42px;padding:20px;background:#f2f7f5;border-radius:12px}.related a{color:#135f50}footer{border-top:1px solid var(--line);padding-top:24px;padding-bottom:32px;color:var(--muted);font-size:.88rem}.tool{max-width:520px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:12px}.tool label{display:block;margin:.7rem 0}.tool input{width:100%;padding:.6rem;font-size:1rem}.tool button{background:var(--accent);color:white;border:0;border-radius:7px;padding:.7rem 1rem;font-size:1rem;cursor:pointer}@media(max-width:600px){header,main,footer{padding-left:16px;padding-right:16px}}