:root{
  --p:#241a12;--ink:#2a211a;--paper:#f7f1e6;--card:#fffdf7;
  --line:#e2d7c4;--accent:#c2543c;--accent2:#8a4a2f;--mut:#6d655b;--maxw:1120px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:"Hiragino Mincho ProN","Yu Mincho",Georgia,serif;line-height:1.85}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
ul.list{margin:14px 0 0 22px}.list li{margin-bottom:10px}

header.site{position:sticky;top:0;z-index:50;background:rgba(247,241,230,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.hd{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:11px;font-weight:800;font-size:1.2rem;letter-spacing:.02em}
.logo img{border-radius:50%}
nav.main{display:flex;gap:22px;align-items:center;font-size:.94rem;font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif}
nav.main a{padding:6px 2px;border-bottom:2px solid transparent;font-weight:600;color:#4d453c}
nav.main a:hover,nav.main a.active{color:var(--accent);border-color:var(--accent)}
.nav-toggle{display:none;background:none;border:0;font-size:1.6rem;color:var(--ink);cursor:pointer}

.btn{display:inline-block;background:var(--p);color:#f7f1e6;padding:13px 30px;border-radius:2px;font-weight:700;font-size:.95rem;font-family:"Hiragino Kaku Gothic ProN",sans-serif;border:1px solid var(--p);transition:.15s}
.btn:hover{background:var(--accent);border-color:var(--accent)}
.btn.ghost{background:transparent;color:var(--p);border:1.4px solid var(--p)}
.btn.light{background:#f7f1e6;color:var(--p);border-color:#f7f1e6}
.btn.sm{padding:8px 18px;font-size:.85rem}

.hero{padding:84px 0 70px;background:
  radial-gradient(circle at 15% 20%, #efe2cb 0, transparent 46%),
  radial-gradient(circle at 88% 12%, #ead6c0 0, transparent 44%),
  var(--paper)}
.hrow{display:grid;grid-template-columns:1.1fr .9fr;gap:54px;align-items:center}
.eyebrow{display:inline-block;color:var(--accent);font-weight:700;letter-spacing:.2em;font-size:.78rem;margin-bottom:18px;border-bottom:2px solid var(--accent);padding-bottom:6px}
.hero h1{font-size:clamp(2.3rem,5.4vw,3.8rem);line-height:1.16;font-weight:900;letter-spacing:.01em}
.hero .sub{margin:24px 0 0;max-width:600px;color:#575045;font-size:1.05rem}
.cta-row{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}
.hcard{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:24px;box-shadow:0 18px 46px rgba(60,40,20,.12)}
.term{font-size:1.5rem;font-weight:900;color:var(--p);font-family:"Courier New",monospace}
.termsub{margin:10px 0 18px;color:var(--mut);font-size:.9rem;font-family:sans-serif;line-height:1.5}
.term-prev{display:flex;gap:10px}
.pp{flex:1;height:110px;border-radius:4px}

.blk{padding:62px 0}
.blk.alt{background:#efe6d4}
h2.sec{font-size:1.65rem;font-weight:900;margin-bottom:12px}
p.sec-sub{color:var(--mut);margin-bottom:32px;max-width:680px}
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:26px}
.card h3{font-size:1.14rem;margin-bottom:8px;color:var(--accent2)}
.card p{color:#575045;font-size:.95rem}
.panel{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:28px}
.ph-line{padding:14px 0;border-bottom:1px dashed var(--line);font-size:.96rem;color:#4d453c}
.ph-line:last-child{border-bottom:0}
.ph-line b{display:block;color:var(--p);margin-bottom:3px}
.note{background:#fbefdf;border-left:4px solid var(--accent);padding:16px 20px;border-radius:4px;color:#575045;font-size:.92rem;margin-top:26px}
.note a{color:var(--accent);font-weight:700}
.narrow{max-width:840px!important}
code{background:var(--line);padding:2px 7px;border-radius:3px;font-size:.9em}

.phead{padding:56px 0 30px;border-bottom:1px solid var(--line)}
.phead h1{font-size:clamp(1.9rem,4.4vw,2.8rem);font-weight:900;line-height:1.15}
.lede{margin-top:14px;max-width:700px;color:#575045;font-size:1.03rem}
.crumb{font-size:.85rem;color:var(--mut);margin-bottom:16px}
.crumb a{color:var(--accent)}

.steps{display:flex;flex-direction:column;gap:14px}
.step{display:flex;gap:18px;background:var(--card);border:1px solid var(--line);border-radius:6px;padding:20px 22px;align-items:flex-start}
.step b{font-size:1.15rem;font-weight:900;color:var(--accent);min-width:42px}
.step strong{color:var(--p)}
.step p{color:#575045;font-size:.94rem}

.cta-band{background:var(--p);color:#f7f1e6;padding:64px 0;text-align:center}
.cta-band .wrap{display:flex;flex-direction:column;align-items:center;max-width:760px}
.cta-band h2{color:#f7f1e6;font-size:1.7rem;font-weight:900}
.cta-band p{color:rgba(247,241,230,.88);margin:12px 0 26px}

table.tb{width:100%;border-collapse:collapse;font-size:.95rem;background:var(--card);border:1px solid var(--line)}
.tb th,.tb td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tb th{background:#efe6d4;font-weight:800}

.faqwrap{display:flex;flex-direction:column;gap:12px}
.faq{background:var(--card);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.faq summary{padding:18px 22px;cursor:pointer;font-weight:800;color:var(--accent2);list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.3rem;color:var(--accent)}
.faq[open] summary::after{content:"–"}
.faq .a{padding:2px 22px 18px;color:#575045;font-size:.95rem}

footer.site{border-top:1px solid var(--line);margin-top:60px;padding:42px 0 34px;background:#efe6d4;color:var(--mut);font-size:.88rem}
.ft{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
.ft p{max-width:400px;margin-top:10px;font-size:.85rem;line-height:1.7}
.ft nav{display:flex;gap:18px;flex-wrap:wrap}
.ft nav a:hover{color:var(--accent)}
.ft .logo{font-weight:800;color:var(--p)}

@media(max-width:840px){
  .g3{grid-template-columns:1fr}
  .g2{grid-template-columns:1fr}
  .hrow{grid-template-columns:1fr}
  .nav-toggle{display:block}
  nav.main{position:fixed;top:68px;left:0;right:0;background:var(--paper);flex-direction:column;align-items:flex-start;padding:18px 24px;gap:15px;border-bottom:1px solid var(--line);display:none;box-shadow:0 12px 30px rgba(0,0,0,.08)}
  nav.main.open{display:flex}
  nav.main .btn{display:inline-block}
  .hero{padding:54px 0 50px}
  .phead{padding:38px 0 22px}
}