#seiIntro { box-sizing:border-box; width:min(92vw,480px); max-height:90dvh; overflow:auto; border:1px solid #eadfc9; border-radius:28px; padding:28px; background:#fffaf0; color:#3c3328; }
#seiIntro::backdrop { background:rgba(35,29,23,.55); }
#seiIntro .sei-intro-top { display:flex; align-items:center; justify-content:space-between; gap:16px; }
#seiIntro [data-intro-skip] { border:0; background:transparent; color:#665c4b; padding:10px; font:inherit; cursor:pointer; }
#seiIntro .sei-intro-star { font-size:56px; text-align:center; color:#c79839; margin:20px 0; }
#seiIntro h2 { font-size:clamp(23px,5vw,30px); line-height:1.4; margin:0 0 18px; }
#seiIntro p { font-size:17px; line-height:1.8; word-break:keep-all; }
#seiIntro [data-intro-detail] { color:#746345; }
#seiIntro [data-intro-next] { width:100%; margin-top:22px; border:0; border-radius:16px; padding:18px 12px; background:#6b5636; color:#fff; font:inherit; font-size:19px; font-weight:700; cursor:pointer; }
.sei-intro-highlight { outline:3px solid #c79839!important; outline-offset:5px; }
@media(prefers-reduced-motion:reduce) { #seiIntro * { scroll-behavior:auto; } }