:root { --black:#1a1a1a; --k10:#e4e4e4; --k20:#cccccc; --k60:#666666; --k80:#333333; }
* { box-sizing:border-box; margin:0; padding:0; }
body { font-family:'Noto Sans JP','Yu Gothic','YuGothic',sans-serif; background:#fff; color:var(--black); min-height:100vh; }
.header { border-bottom:1px solid var(--k10); padding:16px 24px; display:flex; align-items:center; }
.logo-link { display:flex; align-items:center; gap:12px; text-decoration:none; color:inherit; }
.logo-icon { width:28px; height:28px; object-fit:contain; }
.logo-text { font-size:0.95rem; font-weight:700; letter-spacing:0.04em; }
.logo-sub { font-size:0.65rem; color:var(--k60); margin-top:2px; }
main { max-width:680px; margin:0 auto; padding:48px 20px 80px; }
.page-title { font-size:1.3rem; font-weight:900; margin-bottom:6px; }
.updated { font-size:0.75rem; color:var(--k60); margin-bottom:28px; }
.lead { font-size:0.88rem; line-height:1.9; color:var(--k80); margin-bottom:32px; padding-bottom:32px; border-bottom:1px solid var(--k10); }
h2 { font-size:1rem; font-weight:700; margin:36px 0 12px; padding-bottom:8px; border-bottom:1px solid var(--k10); }
h3 { font-size:0.82rem; font-weight:700; color:var(--k60); letter-spacing:0.06em; margin:20px 0 8px; }
p { font-size:0.88rem; line-height:1.9; color:var(--k80); margin-bottom:10px; }
ul, ol { font-size:0.88rem; line-height:2; color:var(--k80); padding-left:1.5em; margin-bottom:10px; }
li { margin-bottom:2px; }
a { color:var(--k60); }
a:hover { color:var(--black); }
.section { margin-bottom:8px; }
.back-link { display:inline-block; margin-top:48px; font-size:0.78rem; color:var(--k60); text-decoration:none; border:1px solid var(--k20); border-radius:4px; padding:8px 16px; }
.back-link:hover { color:var(--black); border-color:var(--black); }
@media (max-width:600px) { main { padding:28px 16px 60px; } .header { padding:12px 16px; } }