:root{
  --paper:#FFF9EE;
  --paper-2:#F3EBDB;
  --ink:#29335E;
  --ink-2:#4A4A46;
  --ink-3:#7A7872;
  --rule:#EDE3D1;
  --mint:#BFE4F2;
  --mint-ink:#2A79A3;
  --max:760px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN","Hiragino Sans",system-ui,sans-serif;
  font-size:16px;line-height:1.9;letter-spacing:.02em;
  overflow-wrap:anywhere;
}
a{color:var(--mint-ink);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{color:var(--ink)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* header */
.site-header{border-bottom:1px solid var(--rule)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px;max-width:1040px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:700;letter-spacing:.08em}
.brand-mark{width:12px;height:12px;background:var(--mint);display:inline-block}
.nav{display:flex;gap:20px;font-size:13px}
.nav a{color:var(--ink-2);text-decoration:none}
.nav a:hover,.nav a[aria-current="page"]{color:var(--ink);box-shadow:inset 0 -2px 0 var(--mint)}

/* hero */
.hero{border-bottom:1px solid var(--rule)}
.hero .wrap{max-width:1040px;padding-top:96px;padding-bottom:88px}
.eyebrow{font-size:12px;letter-spacing:.24em;color:var(--mint-ink);font-weight:700;margin:0 0 28px}
.hero h1{font-family:"Zen Old Mincho","Shippori Mincho","Hiragino Mincho ProN",serif;font-weight:700;
  font-size:clamp(36px,7.4vw,76px);line-height:1.3;letter-spacing:.04em;margin:0 0 32px}
.hero h1 em{font-style:normal;box-shadow:inset 0 -.22em 0 rgba(59,185,138,.38)}
.lead{font-size:17px;color:var(--ink-2);max-width:560px;margin:0 0 40px}
.store{display:inline-flex;align-items:center;gap:14px;border:1px solid var(--ink);padding:12px 22px;font-size:14px;color:var(--ink);text-decoration:none;cursor:default}
.store small{font-size:11px;letter-spacing:.14em;color:var(--paper);background:var(--ink);padding:2px 8px}
.note-18{font-size:12px;color:var(--ink-3);margin-top:20px}

/* features */
.section{border-bottom:1px solid var(--rule)}
.section .wrap{max-width:1040px;padding-top:72px;padding-bottom:72px}
.section-title{display:flex;align-items:baseline;gap:16px;margin:0 0 40px;font-size:13px;letter-spacing:.2em;color:var(--ink-3);font-weight:500}
.section-title::after{content:"";flex:1;height:1px;background:var(--rule)}
.features{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);border-top:1px solid var(--ink)}
.features li{padding:28px 28px 32px 0;border-bottom:1px solid var(--rule)}
.features li:nth-child(odd){border-right:1px solid var(--rule)}
.features li:nth-child(even){padding-left:28px}
.features .num{font-family:"Zen Old Mincho",serif;color:var(--mint-ink);font-size:14px;letter-spacing:.1em}
.features h3{font-size:19px;margin:6px 0 8px;letter-spacing:.04em}
.features p{margin:0;color:var(--ink-2);font-size:14.5px;line-height:1.85}

.links{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}
.links a{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 0;border-bottom:1px solid var(--rule);color:var(--ink);text-decoration:none;font-size:17px}
.links a span{font-size:13px;color:var(--ink-3)}
.links a:hover{color:var(--mint-ink)}
.links a::after{content:"→";color:var(--mint-ink);margin-left:auto;padding-left:12px}

/* document pages */
.doc .wrap{padding-top:64px;padding-bottom:80px}
.doc-head{border-bottom:1px solid var(--ink);padding-bottom:28px;margin-bottom:40px}
.doc-head .eyebrow{margin-bottom:14px}
.doc-head h1{font-family:"Zen Old Mincho","Shippori Mincho",serif;font-size:clamp(28px,5.4vw,40px);line-height:1.4;margin:0 0 12px;letter-spacing:.04em}
.updated{font-size:13px;color:var(--ink-3);margin:0}
.doc h2{font-size:18px;margin:52px 0 14px;padding-left:14px;border-left:3px solid var(--mint);line-height:1.6;letter-spacing:.04em}
.doc h3{font-size:16px;margin:28px 0 8px}
.doc p,.doc li{font-size:15.5px;color:#262624}
.doc ul,.doc ol{padding-left:1.4em;margin:10px 0 16px}
.doc li{margin:4px 0}
.doc li::marker{color:var(--mint-ink)}
.callout{border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);padding:18px 0;margin:24px 0}
.callout p{margin:0}
.callout strong{color:var(--mint-ink)}
table.info{width:100%;border-collapse:collapse;margin:12px 0 8px;font-size:15px}
table.info th,table.info td{text-align:left;vertical-align:top;padding:12px 0;border-bottom:1px solid var(--rule)}
table.info th{width:9em;color:var(--ink-3);font-weight:500;padding-right:16px}
.table-scroll{overflow-x:auto}
table.grid{width:100%;border-collapse:collapse;font-size:14.5px;margin:12px 0}
table.grid th,table.grid td{text-align:left;vertical-align:top;padding:10px 12px 10px 0;border-bottom:1px solid var(--rule)}
table.grid thead th{border-bottom:1px solid var(--ink);font-size:13px;color:var(--ink-3);font-weight:500}

/* faq */
.faq{border-top:1px solid var(--ink);margin-top:8px}
.faq details{border-bottom:1px solid var(--rule)}
.faq summary{cursor:pointer;list-style:none;padding:20px 32px 20px 0;font-weight:700;position:relative;line-height:1.7}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"Q.";color:var(--mint-ink);margin-right:10px;font-family:"Zen Old Mincho",serif}
.faq summary::after{content:"+";position:absolute;right:4px;top:18px;font-weight:400;font-size:20px;color:var(--ink-3)}
.faq details[open] summary::after{content:"−"}
.faq .a{padding:0 0 22px 0}
.faq .a p,.faq .a li{font-size:15px}
.mail{display:inline-block;font-size:clamp(18px,4.6vw,24px);font-weight:700;color:var(--ink);text-decoration:none;border-bottom:2px solid var(--mint);padding-bottom:2px;margin:6px 0 10px}

/* footer */
.site-footer{padding:48px 0 56px;font-size:13px;color:var(--ink-3)}
.site-footer .wrap{max-width:1040px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px}
.site-footer nav{display:flex;flex-wrap:wrap;gap:8px 20px}
.site-footer a{color:var(--ink-2);text-decoration:none}
.site-footer a:hover{color:var(--mint-ink)}
.site-footer address{font-style:normal;line-height:1.8}

@media (max-width:640px){
  .nav{gap:14px;font-size:12px}
  .nav .hide-sm{display:none}
  .hero .wrap{padding-top:64px;padding-bottom:60px}
  .features{grid-template-columns:1fr}
  .features li,.features li:nth-child(odd),.features li:nth-child(even){padding:24px 0 26px;border-right:0}
  .section .wrap{padding-top:56px;padding-bottom:56px}
  table.info th{width:6.5em}
}