:root{
  --paper:#ECEBE3;
  --paper2:#F5F4EE;
  --ink:#1B1D1A;
  --chalk:#2E63B4;
  --tape:#E0A23C;
  --vermilion:#C24033;
  --rule:#C9C6B8;
  --rule-soft:#dedbcf;
  --muted:#6b6b60;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--paper);color:var(--ink);
  font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--chalk);text-decoration:none}
a:hover{text-decoration:underline}

/* ---- header ---- */
.site-header{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  padding:12px 20px;border-bottom:2px solid var(--ink);
  background:var(--paper2);position:sticky;top:0;z-index:10;
}
.site-header .brand{
  font-size:22px;font-weight:800;letter-spacing:.22em;
  text-decoration:none;color:var(--ink);
}
.site-header .brand b{color:var(--vermilion)}
.site-header .tag{font-size:12px;color:var(--muted);letter-spacing:.04em;flex:1}
.hdr-btn{
  margin-left:auto;
  background:var(--ink);color:var(--paper2);
  padding:7px 16px;border-radius:2px;
  font-size:13px;font-weight:700;letter-spacing:.04em;
  text-decoration:none;white-space:nowrap;
}
.hdr-btn:hover{background:#333;text-decoration:none}

/* ---- news banner ---- */
.news-bar{
  background:var(--paper2);border-bottom:1px solid var(--rule);
  font-size:13px;
}
.news-inner{
  max-width:860px;margin:0 auto;
  display:flex;align-items:center;gap:10px;
  padding:8px 20px;
}
.news-label{
  background:var(--vermilion);color:#fff;
  font-size:10px;font-weight:700;letter-spacing:.12em;
  padding:2px 6px;border-radius:2px;white-space:nowrap;
}
.news-head{
  background:none;border:none;cursor:pointer;
  font-size:13px;color:var(--ink);font-weight:600;
  display:flex;align-items:center;gap:5px;padding:0;
}
.news-arrow{font-size:10px;color:var(--muted)}
.news-x{
  margin-left:auto;background:none;border:none;cursor:pointer;
  font-size:18px;color:var(--muted);line-height:1;padding:0 2px;
}
.news-x:hover{color:var(--ink)}
.news-body{padding:0 20px 10px;max-width:860px;margin:0 auto}
.news-list{list-style:disc;padding-left:20px;display:flex;flex-direction:column;gap:4px}
.news-list li{font-size:13px;color:var(--muted)}
.news-list time{color:var(--tape);margin-right:6px;font-size:11px;font-style:normal}

/* ---- shared section ---- */
.section-inner{max-width:860px;margin:0 auto;padding:0 20px}
.sec-title{
  font-size:18px;font-weight:800;margin-bottom:20px;
  padding-bottom:8px;border-bottom:2px solid var(--ink);
  letter-spacing:.03em;
}
.sec-sub{font-size:13px;color:var(--muted);margin:-12px 0 16px;line-height:1.7}

/* ---- hero ---- */
.hero{
  padding:48px 20px 40px;
  background:var(--paper2);border-bottom:1.5px solid var(--rule);
  display:flex;justify-content:center;
}
.hero-inner{max-width:860px;width:100%;display:flex;gap:32px;align-items:center}
.hero-h{
  font-size:28px;font-weight:800;line-height:1.4;
  letter-spacing:.02em;margin-bottom:16px;
}
.hero-sub{
  font-size:14px;line-height:1.85;color:var(--muted);
  margin-bottom:24px;max-width:440px;
}
.cta-btn{
  display:inline-block;
  background:var(--ink);color:var(--paper2);
  padding:12px 24px;border-radius:2px;
  font-size:14px;font-weight:700;letter-spacing:.04em;
  text-decoration:none;
}
.cta-btn:hover{background:#333;text-decoration:none}
.hero-deco{flex-shrink:0;opacity:.5}

/* ---- how section ---- */
.how-section{padding:40px 0;border-bottom:1px solid var(--rule-soft)}
.how-steps{
  list-style:none;counter-reset:step;
  display:flex;gap:20px;flex-wrap:wrap;
}
.how-steps li{
  flex:1;min-width:180px;
  position:relative;padding:16px 16px 16px 50px;
  background:var(--paper2);border:1.5px solid var(--rule);border-radius:2px;
  font-size:13.5px;line-height:1.7;
}
.how-steps li::before{
  counter-increment:step;content:counter(step);
  position:absolute;left:14px;top:16px;
  width:22px;height:22px;line-height:22px;text-align:center;
  background:var(--chalk);color:#fff;font-size:12px;font-weight:700;border-radius:50%;
}
.how-steps li b{display:block;font-weight:700;margin-bottom:4px}

/* ---- patterns section ---- */
.pat-section{padding:40px 0;border-bottom:1px solid var(--rule-soft)}
.cat-block{margin-bottom:24px}
.cat-h{
  font-size:12px;font-weight:700;letter-spacing:.14em;
  color:var(--muted);margin-bottom:10px;
}
.pat-list{
  list-style:none;
  display:flex;flex-wrap:wrap;gap:6px;
}
.pat-list li{
  background:var(--paper2);border:1.5px solid var(--rule);border-radius:2px;
}
.pat-list li a{
  display:block;padding:6px 14px;
  font-size:13px;color:var(--ink);font-weight:600;
  text-decoration:none;
}
.pat-list li a:hover{background:var(--rule-soft);text-decoration:none}
.pat-cta{margin-top:28px}

/* ---- features ---- */
.feat-section{padding:40px 0;border-bottom:1px solid var(--rule-soft)}
.feat-list{
  list-style:none;
  display:flex;flex-wrap:wrap;gap:16px;
}
.feat-list li{
  flex:1;min-width:200px;
  padding:16px 18px;
  background:var(--paper2);border:1.5px solid var(--rule);border-radius:2px;
}
.feat-list li b{display:block;font-size:14px;font-weight:700;margin-bottom:6px}
.feat-list li p{font-size:13px;color:var(--muted);line-height:1.7;margin:0}

/* ---- howto links ---- */
.howto-section{padding:40px 0}
.howto-links{
  list-style:none;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:4px;
}
.howto-links li a{
  display:block;padding:8px 12px;
  font-size:13px;background:var(--paper2);
  border:1px solid var(--rule);border-radius:2px;
  color:var(--chalk);text-decoration:none;
}
.howto-links li a:hover{background:var(--rule-soft);text-decoration:none}

/* ---- footer ---- */
.site-footer{
  border-top:1px solid var(--rule);padding:12px 20px;
  display:flex;gap:16px;align-items:center;flex-wrap:wrap;
  font-size:11px;color:var(--muted);background:var(--paper2);
}
.site-footer a{color:var(--muted);text-decoration:underline;cursor:pointer}
.site-footer a:hover{color:var(--ink)}

/* ---- privacy modal ---- */
.modal-overlay{
  display:none;position:fixed;inset:0;
  background:rgba(27,29,26,.55);z-index:100;
  align-items:center;justify-content:center;
}
.modal-overlay.open{display:flex}
.modal-box{
  background:#fff;max-width:560px;width:90%;max-height:80vh;
  border-radius:2px;overflow:hidden;display:flex;flex-direction:column;
}
.modal-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;border-bottom:1px solid var(--rule);
}
.modal-head h2{font-size:15px;font-weight:700}
.modal-close{
  background:none;border:none;cursor:pointer;
  font-size:22px;color:var(--muted);line-height:1;
}
.modal-body{padding:16px 20px 24px;overflow-y:auto;font-size:13px;line-height:1.85}
.modal-body h3{font-size:13.5px;font-weight:700;margin:16px 0 6px}
.modal-body p{margin:0 0 8px}
.modal-body a{color:var(--chalk)}
.policy-date{color:var(--muted);font-size:11px;margin-top:16px}

@media(max-width:600px){
  .hero-inner{flex-direction:column;gap:20px}
  .hero-deco{display:none}
  .hero-h{font-size:22px}
  .hdr-btn{display:none}
  .how-steps{flex-direction:column}
}