:root{
  --ink:#17213a;
  --ink-soft:#44506b;
  --paper:#edeff2;
  --card:#f8f9fb;
  --tile-1:#c8d0dc;
  --tile-2:#9aa7bd;
  --tile-3:#5b6b88;
  --tape:#f0c419;
  --rule:#cfd5de;
  --todo:#fff1b8;
  --font-body:"Zen Kaku Gothic New","Hiragino Sans","Yu Gothic",Meiryo,sans-serif;
  --font-pixel:"DotGothic16","Zen Kaku Gothic New",monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-body);font-size:16px;line-height:1.85;letter-spacing:.02em}
img,canvas{max-width:100%;display:block}
a{color:var(--ink);text-underline-offset:3px}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--tape);outline-offset:2px}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
.prose > *{max-width:720px}
.prose .tool,.prose .table-wrap{max-width:720px}

/* header */
.site-header{border-bottom:1px solid var(--rule);background:var(--paper)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.logo{font-family:var(--font-pixel);font-size:22px;text-decoration:none;letter-spacing:.04em}
.logo small{font-family:var(--font-body);font-size:12px;color:var(--ink-soft);margin-left:8px;letter-spacing:.06em}
.nav{display:flex;gap:20px;flex-wrap:wrap;font-size:14px}
.nav a{text-decoration:none}
.nav a[aria-current="page"]{border-bottom:3px solid var(--tape)}

/* hero */
.hero{padding:56px 0 48px}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center}
.hero h1{font-family:var(--font-pixel);font-weight:400;font-size:clamp(34px,6vw,58px);line-height:1.2;margin:0 0 20px;letter-spacing:.02em}
.hero .lead{font-size:17px;max-width:30em;margin:0 0 28px}
.btn{display:inline-block;background:var(--ink);color:var(--paper);padding:14px 22px;text-decoration:none;font-weight:700;border:0;cursor:pointer;font-family:inherit;font-size:15px}
.btn.tape{background:var(--tape);color:var(--ink)}
.btn + .btn{margin-left:10px}
.demo{background:var(--card);border:1px solid var(--rule);padding:16px}
.demo canvas{width:100%;height:auto;image-rendering:pixelated;background:var(--tile-1)}
.demo-controls{display:flex;align-items:center;gap:12px;margin-top:12px;font-size:14px}
.demo-controls input[type=range]{flex:1;accent-color:var(--ink)}
.demo-controls output{font-family:var(--font-pixel);min-width:5.5em;text-align:right}
.demo-note{font-size:13px;color:var(--ink-soft);margin:8px 0 0}

/* sections */
section{padding:48px 0;border-top:1px solid var(--rule)}
h2{font-size:26px;line-height:1.4;margin:0 0 20px}
h3{font-size:18px;margin:28px 0 8px}
p{margin:0 0 1em}
.muted{color:var(--ink-soft)}

.price{display:grid;grid-template-columns:auto 1fr;gap:12px 32px;align-items:baseline}
.price .big{font-family:var(--font-pixel);font-size:clamp(44px,8vw,72px);line-height:1}
.price .big span{font-size:.35em;margin-left:.2em}

table{border-collapse:collapse;width:100%;font-size:15px}
.table-wrap{overflow-x:auto}
th,td{border-bottom:1px solid var(--rule);padding:12px 10px;text-align:left;vertical-align:top}
th{font-weight:700;background:var(--card)}

.promises{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border-top:1px solid var(--rule);border-left:1px solid var(--rule)}
.promises div{padding:20px;border-right:1px solid var(--rule);border-bottom:1px solid var(--rule);background:var(--card)}
.promises h3{margin:0 0 6px}
.promises p{margin:0;font-size:15px}
.promises .key{background:var(--tape)}

ol.steps{list-style:none;padding:0;margin:0;counter-reset:s}
ol.steps li{counter-increment:s;display:grid;grid-template-columns:48px 1fr;gap:12px;padding:14px 0;border-bottom:1px solid var(--rule)}
ol.steps li::before{content:counter(s);font-family:var(--font-pixel);font-size:26px;line-height:1.2}
ol.steps strong{display:block}

details{border-bottom:1px solid var(--rule);padding:14px 0}
summary{cursor:pointer;font-weight:700}
details p{margin:10px 0 0}

.cta-band{background:var(--ink);color:var(--paper);padding:40px 0;border:0}
.cta-band a{color:var(--paper)}
.cta-band .btn{background:var(--tape);color:var(--ink)}

.todo{background:#fff1b8;color:#17213a;padding:0 .2em;outline:1px dashed #b08a00}

.card-list{list-style:none;padding:0;margin:0}
.card-list li{border-bottom:1px solid var(--rule);padding:18px 0}
.card-list a{font-weight:700;font-size:18px}
.card-list p{margin:4px 0 0;font-size:15px;color:var(--ink-soft)}

.tool{background:var(--card);border:1px solid var(--rule);padding:20px;margin:24px 0}
.tool-row{display:flex;flex-wrap:wrap;gap:12px;align-items:end;margin-bottom:16px}
.tool label{display:block;font-size:13px;color:var(--ink-soft)}
.tool select,.tool input[type=number]{font:inherit;padding:8px 10px;border:1px solid var(--tile-2);background:#fff;min-width:9em}
.result{font-family:var(--font-pixel);font-size:40px;line-height:1.1}
.result small{font-family:var(--font-body);font-size:14px;margin-left:6px}

.breadcrumb{font-size:13px;color:var(--ink-soft);padding-top:20px}
.breadcrumb a{color:var(--ink-soft)}
.page-title{padding-top:28px;padding-bottom:8px;border:0}
.page-title h1{font-size:clamp(26px,4vw,36px);line-height:1.35;margin:0 0 12px}

.site-footer{border-top:1px solid var(--rule);padding:32px 0 48px;font-size:13px;color:var(--ink-soft)}
.site-footer nav{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:10px}

@media (max-width:760px){
  .hero-grid{grid-template-columns:1fr}
  .promises{grid-template-columns:1fr}
  .price{grid-template-columns:1fr}
  .btn + .btn{margin:10px 0 0}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}