:root{
  --ink:#1F2A37; --ink-2:#4B5B6B; --line:rgba(31,42,55,.14); --paper:#fff; --tint:#F3F8FB;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB",sans-serif;
}
*{box-sizing:border-box;margin:0}
html{-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased;line-height:1.65}
a{color:inherit}
nav{max-width:760px;margin:0 auto;height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:18px;text-decoration:none}
.brand img{width:30px;height:30px;border-radius:8px}
.lang{font-size:14px;color:var(--ink-2)}
.lang a{text-decoration:none;padding:4px 6px}.lang a:hover{text-decoration:underline}
main{max-width:760px;margin:0 auto;padding:24px 20px 80px}
h1{font-size:clamp(30px,6vw,40px);letter-spacing:-.02em;line-height:1.15}
.meta{color:var(--ink-2);font-size:14px;margin:10px 0 28px}
.lead{font-size:17px;margin-bottom:8px}
h2{font-size:20px;letter-spacing:-.01em;margin:36px 0 10px}
p,li{font-size:16px;color:var(--ink-2)}
p+p{margin-top:10px}
ul{padding-left:1.2em;margin-top:8px}li+li{margin-top:6px}
strong{color:var(--ink);font-weight:600}
.note{background:var(--tint);border-radius:12px;padding:16px 18px;margin:20px 0}
.note p{color:var(--ink)}
hr{border:0;border-top:1px solid var(--line);margin:64px 0 48px}
details{border-top:1px solid var(--line)}details:last-of-type{border-bottom:1px solid var(--line)}
summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;padding:18px 0;font-size:17px;font-weight:500}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--ink-2);font-size:22px;line-height:1}
details[open] summary::after{content:"−"}
details p{padding:0 0 18px}
.mail{display:inline-block;margin-top:12px;background:var(--ink);color:#fff;text-decoration:none;border-radius:999px;padding:11px 20px;font-size:15px;word-break:break-all}
footer{background:var(--ink);color:#fff;padding:36px 20px}
.foot{max-width:760px;margin:0 auto;display:flex;flex-wrap:wrap;gap:12px 24px;font-size:14px}
.foot a{opacity:.85;text-decoration:none}.foot a:hover{opacity:.6}
.foot .copy{width:100%;opacity:.6;font-size:13px}