:root{--bg:#fff;--ink:#111;--mute:#7a7a7a;--line:#e3e3e3;--soft:#f6f6f6}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.9 -apple-system,"Hiragino Sans","Hiragino Kaku Gothic ProN","PingFang SC","Noto Sans CJK SC","Noto Sans CJK JP",system-ui,sans-serif;padding-inline:24px;letter-spacing:.02em;font-weight:300}
a{color:inherit}
b,strong,h1,h2,h3,summary,th{font-weight:500}
.wrap{max-width:720px;margin:0 auto}
header{display:flex;align-items:baseline;justify-content:space-between;padding-block:36px 0;gap:16px;border-bottom:1px solid var(--line);padding-bottom:18px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:17px;letter-spacing:.12em}
.brand img{width:15px;height:auto;transform:translateY(2px)}
.brand small{color:var(--mute);letter-spacing:.06em;font-size:12px;text-transform:uppercase}
nav{display:flex;gap:26px}
nav a{text-decoration:none;color:var(--mute);font-size:13px;letter-spacing:.1em;padding-bottom:2px}
nav a:hover,nav a.on{color:var(--ink);border-bottom:1px solid var(--ink)}
.hero{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center;padding-block:96px 72px}
.hero h1{font:400 clamp(28px,4.6vw,40px)/1.5 "Hiragino Mincho ProN","Yu Mincho","Songti SC","Noto Serif CJK SC","Noto Serif CJK JP",Georgia,serif;margin:0 0 22px;letter-spacing:.06em}
.hero h1 em{font-style:normal;border-bottom:1px solid var(--ink);padding-bottom:2px}
.hero p{color:var(--mute);margin:0 0 34px;max-width:34em}
.btn{display:inline-block;border:1px solid var(--ink);cursor:pointer;font:inherit;font-weight:400;font-size:13px;letter-spacing:.12em;padding:11px 26px;background:var(--ink);color:#fff;text-decoration:none;transition:opacity .15s}
.btn:hover{opacity:.75}
.btn.red{background:var(--ink)}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:var(--soft);opacity:1}
.btn.sm{padding:8px 16px;font-size:12px}
.btn:disabled{opacity:.4;cursor:default}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line)}
.grid3 .card{border:0;border-right:1px solid var(--line);padding:28px 22px 28px 0;margin-right:22px}
.grid3 .card:last-child{border-right:0;margin-right:0}
.card{background:transparent;border:1px solid var(--line);padding:26px}
.card h3{margin:0 0 10px;font-size:15px;letter-spacing:.06em}
.card p{margin:0;color:var(--mute);font-size:14px}
.fold{position:relative}
section{padding-block:40px;border-top:1px solid var(--line)}
section:first-of-type{border-top:0}
h2{font:400 13px/1 inherit;letter-spacing:.24em;color:var(--mute);margin:0 0 30px;text-transform:uppercase}
.price{text-align:left}
.price .n{font:400 30px/1.2 "Hiragino Mincho ProN","Yu Mincho","Songti SC","Noto Serif CJK SC",Georgia,serif;margin:8px 0 4px}
.price .d{color:var(--mute);font-size:13px;margin-bottom:16px}
.muted{color:var(--mute);font-size:13px}
footer{padding-block:48px 56px;color:var(--mute);font-size:12px;letter-spacing:.08em;border-top:1px solid var(--line);margin-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
footer a{text-decoration:none}
input,textarea{font:inherit;width:100%;padding:12px 0;border:0;border-bottom:1px solid var(--ink);background:transparent;color:var(--ink);outline:none;border-radius:0;letter-spacing:.08em}
input::placeholder{color:#c4c4c4}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.num{font-size:26px;letter-spacing:.18em;font-weight:400}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.kv{display:grid;grid-template-columns:repeat(5,1fr);gap:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.kv div{padding:16px 0;border-right:1px solid var(--line);padding-right:12px;margin-right:12px}
.kv div:last-child{border-right:0}
.kv b{display:block;font-size:18px;font-weight:400;white-space:nowrap}
.kv span{font-size:11px;color:var(--mute);letter-spacing:.1em}
.pill{display:inline-block;font-size:13px;font-weight:400}
.pill.ok:before,.pill.no:before,.pill.gray:before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:7px;vertical-align:1px;background:var(--ink)}
.pill.no:before{background:transparent;box-shadow:inset 0 0 0 1px var(--ink)}
.pill.gray:before{background:#c8c8c8}
.msg{padding:10px 0 0;font-size:13px;display:none;color:var(--ink)}
.msg.ok{display:block}.msg.err{display:block;color:var(--ink)}
.msg.err:before{content:"— "}
.stack{display:grid;gap:40px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:56px}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:14px 10px 14px 0;border-bottom:1px solid var(--line);font-size:14px}
th{font-size:11px;color:var(--mute);letter-spacing:.14em;font-weight:400}
.steps{counter-reset:s;display:grid;gap:14px;padding:0;margin:0}
.steps li{list-style:none;position:relative;padding-left:44px}
.steps li:before{counter-increment:s;content:"0" counter(s);position:absolute;left:0;top:0;color:var(--mute);font-size:12px;letter-spacing:.1em;line-height:inherit}
code{background:var(--soft);padding:1px 6px;font-size:13px}
details{border-top:1px solid var(--line);padding:18px 0}
details:last-child{border-bottom:1px solid var(--line)}
summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;font-size:15px}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";color:var(--mute)}
details[open] summary:after{content:"−"}
.hide{display:none!important}
@media(max-width:720px){.hero{grid-template-columns:1fr;padding-block:56px 40px}.grid3{grid-template-columns:1fr}.grid3 .card{border-right:0;border-bottom:1px solid var(--line);margin-right:0;padding-right:0}.grid3 .card:last-child{border-bottom:0}.two{grid-template-columns:1fr;gap:40px}.num{font-size:20px;letter-spacing:.12em}.kv{grid-template-columns:1fr 1fr}.kv div:nth-child(2n){border-right:0}.kv b{font-size:18px}header{flex-direction:column;gap:14px}nav{gap:18px}}