:root{
  --forest-deep:#1B2A4A;
  --forest-mid:#2C4270;
  --gold:#FFC531;
  --gold-light:#FFDD85;
  --gold-deep:#C99A12;
  --parchment:#FFFBF2;
  --parchment-deep:#FFF3D6;
  --ink:#1D2333;
  --ink-soft:#4E5770;
  --white:#FFFFFF;
  --shadow:0 10px 30px rgba(22,48,42,0.12);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:'Noto Sans JP',sans-serif;
  background:var(--parchment);
  color:var(--ink);
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,.serif{font-family:'Noto Serif JP',serif;}
a{text-decoration:none;color:inherit;}
.wrap{max-width:960px;margin:0 auto;padding:0 24px;}

header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,251,242,0.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(27,42,74,0.08);
}
.header-inner{
  max-width:1080px;margin:0 auto;padding:16px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.logo{display:flex;align-items:center;gap:10px;}
.logo-mark{
  width:34px;height:34px;border-radius:50%;
  background:var(--forest-deep);
  display:flex;align-items:center;justify-content:center;
}
.logo-mark svg{width:18px;height:18px;}
.logo-text{
  font-family:'Noto Serif JP',serif;font-weight:600;
  font-size:17px;color:var(--forest-deep);
}
.logo-text small{
  display:block;font-family:'Noto Sans JP',sans-serif;
  font-size:9px;letter-spacing:.18em;color:#8B96B0;
}
.nav-menu{display:flex;align-items:center;gap:20px;font-size:12.5px;color:var(--forest-deep);font-weight:500;}
.nav-menu a:hover{color:var(--gold-deep);}
.btn-line{
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 20px;border-radius:999px;
  background:var(--forest-deep);color:var(--parchment);
  font-size:13px;font-weight:600;
}

.page-hero{
  padding:74px 0 54px;
  text-align:center;
  background:
    radial-gradient(circle at 85% -10%, rgba(255,197,49,.16), transparent 50%),
    radial-gradient(circle at 0% 100%, rgba(44,66,112,.08), transparent 45%);
}
.eyebrow{
  display:inline-block;
  color:var(--gold-deep);
  font-size:12px;font-weight:700;letter-spacing:.18em;
  margin-bottom:14px;
}
.page-hero h1{
  color:var(--forest-deep);
  font-size:clamp(28px,4vw,42px);
  margin-bottom:14px;
}
.page-hero p{font-size:14px;color:var(--ink-soft);}

.rules-section{padding:56px 0 80px;}
.rule-card{
  background:var(--white);
  border:1px solid rgba(27,42,74,.08);
  border-radius:20px;
  padding:34px 32px;
  margin-bottom:22px;
  box-shadow:var(--shadow);
}
.rule-number{
  display:inline-flex;
  align-items:center;justify-content:center;
  width:36px;height:36px;border-radius:50%;
  background:var(--gold);color:var(--forest-deep);
  font-family:'Noto Serif JP',serif;font-weight:700;
  margin-bottom:16px;
}
.rule-card h2{
  color:var(--forest-deep);
  font-size:21px;
  margin-bottom:16px;
}
.rule-card h3{
  color:var(--forest-mid);
  font-size:16px;
  margin:22px 0 8px;
}
.rule-card p{
  color:var(--ink-soft);
  font-size:14px;
  margin-bottom:12px;
}
.rule-card ul{
  list-style:none;
  margin:16px 0;
}
.rule-card li{
  position:relative;
  padding-left:22px;
  margin-bottom:10px;
  color:var(--ink-soft);
  font-size:14px;
}
.rule-card li::before{
  content:"";
  position:absolute;left:0;top:.72em;
  width:8px;height:8px;border-radius:50%;
  background:var(--gold);
}
.notice{
  margin-top:18px;
  padding:16px 18px;
  background:var(--parchment-deep);
  border-left:4px solid var(--gold);
  border-radius:8px;
}

.back-area{text-align:center;margin-top:36px;}
.back-area .btn-line{padding:14px 28px;}

footer{
  background:var(--forest-deep);
  color:rgba(255,251,242,.62);
  padding:34px 0;
  text-align:center;
}
.footer-links{
  display:flex;justify-content:center;gap:18px;flex-wrap:wrap;
  margin-bottom:14px;font-size:12px;
}
.footer-copy{font-size:11px;}

@media(max-width:760px){
  .header-inner{flex-wrap:wrap;}
  .nav-menu{order:3;width:100%;justify-content:center;gap:14px;flex-wrap:wrap;}
  .header-inner>.btn-line{display:none;}
  .rule-card{padding:26px 20px;}
  .page-hero{padding:56px 0 40px;}
}