/* Outer gate — deep tech blue, one CTA */
:root{
  --bg1:#050814;
  --bg3:#0c1f3d;
  --text:#f3f7ff;
  --muted:#aeb9d2;
  --line:rgba(255,255,255,.14);
  --green:#2fbf56;
  --green2:#1f9d45;
  --accent:#6ee7a0;
  --warm:#ffd166;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%}
body{
  font-family:"Noto Sans JP","Hiragino Sans","Segoe UI",sans-serif;
  color:var(--text);
  background:var(--bg1);
}
.gate{
  min-height:100vh;
  display:grid;
  place-items:center;
  padding:36px 20px;
  background:
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(40,90,180,.22), transparent 55%),
    linear-gradient(165deg, var(--bg3) 0%, var(--bg1) 45%, #03060f 100%);
}
.gate-inner{
  width:min(520px,100%);
  display:flex;
  flex-direction:column;
  gap:18px;
}
h1{
  margin:0;
  font-size:clamp(26px,5.4vw,36px);
  line-height:1.4;
  font-weight:900;
}
h1 span{color:var(--warm)}
.copy p{
  margin:0 0 12px;
  color:var(--muted);
  font-size:clamp(15px,2.5vw,17px);
  line-height:1.9;
}
.copy p:last-child{margin-bottom:0}
.copy strong{color:#e8eefc;font-weight:700}
.copy .highlight{
  color:#e8eefc;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:12px 0;
  margin:4px 0 12px;
}
.copy .highlight strong{color:var(--accent)}
.rules{
  margin:0 0 12px;
  padding:14px 16px 14px 1.4em;
  list-style:disc;
  color:var(--muted);
  font-size:15px;
  line-height:1.85;
  background:rgba(255,255,255,.04);
  border:1px solid var(--line);
  border-radius:12px;
}
.rules b{color:var(--text)}
.copy .cta-line{
  color:var(--text);
  font-weight:700;
}
.enter-btn{
  display:flex;
  align-items:center;
  justify-content:center;
  margin-top:4px;
  width:100%;
  max-width:280px;
  align-self:center;
  min-height:52px;
  border-radius:10px;
  font-weight:800;
  font-size:17px;
  text-decoration:none;
  color:#04150a;
  background:var(--green);
}
.enter-btn:active{background:var(--green2);color:#fff}
@media (max-width:480px){
  .gate{padding:28px 16px}
  .enter-btn{min-height:50px;font-size:16px;max-width:100%}
}