:root{--ink:#1f2a37;--muted:#5f6b7a;--line:#e3e7ee;--surface:#f6f7fb;--accent:#2f5bd3;--accent-dark:#2448a8}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--surface);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;font-size:15px;line-height:1.8}
a{color:var(--accent)}
a:focus-visible{outline:3px solid #8aa6ef;outline-offset:3px}
.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:16px;top:12px;background:white;padding:8px 12px;border-radius:6px}
.site-header{max-width:1080px;margin:auto;padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:800;font-size:20px;letter-spacing:-.3px}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--accent);color:white;font-size:17px}
.site-header nav{display:flex;gap:18px;font-size:14px}.site-header nav a{color:var(--muted);text-decoration:none}.site-header nav a:hover{color:var(--ink)}
main{max-width:1080px;margin:auto;padding:0 24px}
.hero{padding:56px 0 40px;text-align:center}
.hero h1{font-size:38px;line-height:1.45;margin:0 0 14px;letter-spacing:.5px}
.hero p{color:var(--muted);margin:0 auto;max-width:640px}
.section-title{font-size:22px;margin:0 0 16px}
.tools{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-bottom:48px}
.tool-card{display:flex;flex-direction:column;background:white;border:1px solid var(--line);border-radius:16px;padding:24px}
.tool-card .tool-head{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.tool-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;color:white;font-size:22px;flex:none}
.tool-card h3{font-size:19px;margin:0}.tool-card .for{display:block;font-size:12px;color:var(--muted);font-weight:400}
.tool-card p{margin:0 0 14px;color:#3a4553}
.tool-card ul{margin:0 0 18px;padding-left:20px;color:#3a4553;font-size:14px}
.tool-card .open{margin-top:auto;align-self:flex-start;background:var(--accent);color:white;text-decoration:none;font-weight:700;padding:10px 18px;border-radius:8px}
.tool-card .open:hover{background:var(--accent-dark)}
.info{background:white;border:1px solid var(--line);border-radius:16px;padding:24px 28px;margin-bottom:48px}
.info h2{font-size:20px;margin:0 0 10px}.info p{margin:0 0 10px}
.doc{max-width:760px;margin:24px auto 56px;background:white;border:1px solid var(--line);border-radius:16px;padding:36px 40px}
.doc h1{font-size:28px;line-height:1.5;margin:0 0 6px}.doc .updated{color:var(--muted);font-size:13px;margin:0 0 20px}
.doc h2{font-size:19px;margin:32px 0 10px;padding-left:10px;border-left:4px solid var(--accent)}
.doc dl{display:grid;grid-template-columns:8em 1fr;gap:8px 14px;margin:0}.doc dt{font-weight:700}.doc dd{margin:0;overflow-wrap:anywhere}
.site-footer{border-top:1px solid var(--line);max-width:1080px;margin:auto;padding:24px;display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px;color:var(--muted);font-size:13px}
.site-footer nav{display:flex;flex-wrap:wrap;gap:6px 16px}.site-footer nav a{color:var(--muted)}
.site-footer small{margin-left:auto}
@media(max-width:760px){.tools{grid-template-columns:1fr}.hero h1{font-size:30px}.site-header{flex-wrap:wrap}.site-footer small{margin-left:0;width:100%}}
@media(max-width:480px){.site-header{padding:16px}main{padding:0 16px}.hero{padding:36px 0 28px}.hero h1{font-size:25px}.doc{padding:24px 18px;margin:16px auto 40px}.doc h1{font-size:23px}.doc dl{grid-template-columns:1fr;gap:2px}.doc dd{margin-bottom:10px}.info{padding:20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}