:root { color-scheme: light dark; --bg:#fbfaf7; --surface:#fff; --ink:#263044; --muted:#626a78; --line:#e5e5e2; --link:#285dc0; }
* { box-sizing:border-box; }
body { margin:0; background:var(--bg); color:var(--ink); font:17px/1.85 -apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif; -webkit-text-size-adjust:100%; }
a { color:var(--link); text-underline-offset:4px; overflow-wrap:anywhere; }
a:focus-visible { outline:3px solid var(--link); outline-offset:5px; }
.wrap { max-width:800px; margin:auto; padding:32px 24px 56px; }
.brand { display:inline-flex; align-items:center; gap:14px; color:var(--ink); text-decoration:none; font-weight:750; font-size:24px; }
.brand img { width:64px; height:64px; border-radius:14px; }
nav { display:flex; flex-wrap:wrap; gap:8px 24px; border-bottom:1px solid var(--line); padding:18px 0; margin-bottom:36px; font-size:15px; }
nav a { display:inline-block; padding:5px 0; }
h1 { font-size:clamp(26px,5vw,36px); line-height:1.5; letter-spacing:.01em; margin:0 0 16px; }
h2 { font-size:21px; line-height:1.6; margin:36px 0 12px; }
h3 { font-size:17px; margin:24px 0 6px; }
p { margin:0 0 16px; }
ul { padding-left:1.5em; }
.muted { color:var(--muted); }
.contact { background:var(--surface); border:1px solid var(--line); border-radius:16px; padding:24px; margin:28px 0; }
.contact h2 { margin-top:0; }
.button { display:inline-flex; justify-content:center; min-height:48px; align-items:center; padding:10px 24px; border-radius:12px; background:var(--link); color:white; text-decoration:none; font-weight:700; }
.email { display:block; margin:14px 0 0; }
footer { border-top:1px solid var(--line); padding-top:24px; margin-top:40px; font-size:14px; color:var(--muted); }
@media (prefers-color-scheme:dark) { :root { --bg:#17191e; --surface:#22252c; --ink:#f0f1f5; --muted:#b5bbc7; --line:#383c45; --link:#94bbff; } .button { color:#14213a; } }
@media (max-width:420px) { .wrap { padding:24px 20px 40px; } .contact { padding:20px; } }