/* ---------- scroll-driven logo interlude ---------- */
.interlude{position:relative;height:300vh;margin-top:56px}
.interlude .stick{position:sticky;top:64px;height:calc(100vh - 64px);display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:hidden}
.interlude .glow{position:absolute;left:50%;top:52%;width:min(900px,160vw);height:min(900px,160vw);transform:translate(-50%,-50%) scale(var(--gs,.6));border-radius:50%;background:radial-gradient(circle,rgba(113,134,255,.28),rgba(113,134,255,.08) 40%,transparent 65%);opacity:var(--go,.3);pointer-events:none}
.interlude svg.biglogo{width:min(520px,78vw);height:auto;overflow:visible;transform:scale(var(--ls,.85))}
.interlude .bl-sun{transform:translateY(var(--sy,46px));transform-box:fill-box}
.interlude .bl-line{stroke-dasharray:100;stroke-dashoffset:var(--d,100)}
.interlude .words{position:relative;height:3.4em;width:100%;margin-top:34px;text-align:center}
.interlude .w{position:absolute;inset:0;font:700 clamp(28px,4.6vw,60px)/1.05 var(--display);letter-spacing:-.03em;opacity:0;transform:translateY(16px);transition:opacity .45s,transform .45s}
.interlude .w.on{opacity:1;transform:none}
.interlude .w em{font-style:normal;color:var(--cobalt)}
.interlude .w small{display:block;font:500 16px/1.5 var(--body);color:var(--ink2);letter-spacing:0;margin-top:12px}
.interlude .prog{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);display:flex;gap:8px}
.interlude .prog i{width:26px;height:3px;border-radius:2px;background:var(--rule);transition:background .3s}
.interlude .prog i.on{background:var(--cobalt)}

/* ---------- mini game ---------- */
.game{margin-top:72px;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:40px;align-items:center}
.game h2{font-size:clamp(30px,3.6vw,44px);line-height:1.05}
.game .lead{color:var(--ink2);font-size:17px;margin:14px 0 20px;max-width:44ch}
.scoreboard{display:flex;gap:12px;flex-wrap:wrap}
.scoreboard div{background:var(--paper);border:1px solid var(--rule);border-radius:12px;padding:10px 14px;min-width:96px}
.scoreboard span{display:block;font-size:12px;color:var(--ink2)}
.scoreboard b{font:700 24px var(--display)}
.gcard{background:var(--paper);border:1px solid var(--rule);border-radius:20px;padding:22px;position:relative;overflow:hidden;transition:border-color .3s,box-shadow .3s}
.gcard.right{border-color:var(--up);box-shadow:0 0 0 1px var(--up),0 24px 60px -30px var(--up)}
.gcard.wrong{border-color:var(--down);box-shadow:0 0 0 1px var(--down),0 24px 60px -30px var(--down)}
.gcard .gtop{display:flex;align-items:center;gap:12px}
.gcard .gtop .mark{width:44px;height:44px;border-radius:12px;font-size:14px}
.gcard .gtop b{font:700 22px var(--display);display:block}
.gcard .gtop small{color:var(--ink2)}
.gcard .gtop .px{margin-left:auto;text-align:right}
.gcard .gtop .px b{font-size:18px}
.gsig{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:16px 0}
.gsig div{background:var(--fog);border:1px solid var(--rule);border-radius:10px;padding:10px 12px;font-size:13px}
.gsig span{display:block;color:var(--ink2);font-size:12px}
.gsig b{font-size:15px}
.gbtns{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.gbtns button{border:1px solid var(--rule);background:var(--fog);border-radius:12px;padding:14px;font-weight:700;font-size:15px;transition:transform .15s,border-color .2s}
.gbtns button:hover{transform:translateY(-2px)}
.gbtns .safe:hover{border-color:var(--up);color:var(--up)}
.gbtns .risky:hover{border-color:var(--down);color:var(--down)}
.gverdict{display:none;gap:10px;align-items:flex-start;margin-top:4px;animation:rise .4s cubic-bezier(.2,.7,.2,1)}
.gcard.done .gverdict{display:flex}
.gcard.done .gbtns{display:none}
.gverdict .bubble{flex:1}
.gverdict .res{font:700 16px var(--display);margin-bottom:4px}
.gnext{margin-top:12px;width:100%;justify-content:center}
.gcard.flip{animation:flip .45s ease}
@keyframes flip{0%{transform:rotateY(0)}50%{transform:rotateY(90deg)}100%{transform:rotateY(0)}}

/* ---------- page headers on inner pages ---------- */
.phead{position:relative;isolation:isolate;padding:36px 0 30px;margin:-40px 0 8px}
.phead:before{content:"";position:absolute;top:0;bottom:0;left:50%;width:100vw;transform:translateX(-50%);z-index:-1;
  background:radial-gradient(520px 260px at 82% 100%,rgba(113,134,255,.22),transparent 70%),
             repeating-linear-gradient(to bottom,transparent 0 23px,color-mix(in srgb,var(--cobalt) 10%,transparent) 23px 24px);
  -webkit-mask-image:linear-gradient(to bottom,#000 40%,transparent);mask-image:linear-gradient(to bottom,#000 40%,transparent)}
.phead:after{content:"";position:absolute;right:max(0px,calc(50% - 50vw + 28px));bottom:0;width:180px;height:90px;border-radius:180px 180px 0 0;background:radial-gradient(circle at 50% 100%,rgba(154,168,255,.55),rgba(113,134,255,.15) 60%,transparent 72%);z-index:-1;animation:bigrise 1.6s cubic-bezier(.2,.7,.2,1) both}
.phead .h-page{font-size:clamp(40px,5vw,64px);letter-spacing:-.035em;animation:rise .6s cubic-bezier(.2,.7,.2,1) both}
.phead .lede{animation:rise .6s .08s cubic-bezier(.2,.7,.2,1) both}
.phead .pstat{display:inline-flex;align-items:center;gap:10px;margin-top:16px;font-size:13px;color:var(--ink2);border:1px solid var(--rule);border-radius:999px;padding:5px 12px 5px 6px;background:color-mix(in srgb,var(--paper) 80%,transparent)}
.phead .pstat b{color:var(--ink)}
.phead .hline{position:absolute;left:50%;bottom:0;width:100vw;height:1px;transform:translateX(-50%);background:linear-gradient(90deg,transparent,var(--rule) 20%,var(--ink2) 80%,transparent)}

/* ---------- pointer spotlight on cards ---------- */
.spot{background-image:radial-gradient(360px circle at var(--mx,50%) var(--my,50%),rgba(113,134,255,.12),transparent 60%)}

@media (max-width:900px){.game{grid-template-columns:1fr;gap:24px}}
@media (max-width:600px){
  .interlude{height:260vh;margin-top:40px}
  .interlude .words{height:4.6em}
  .interlude .w small{font-size:14px}
  .gsig b{font-size:14px}
  .phead{padding:28px 0 22px;margin-top:-28px}
  .phead:after{width:120px;height:60px}
}
@media (prefers-reduced-motion:reduce){.interlude{height:auto}.interlude .stick{position:relative;height:auto;padding:60px 0}.interlude .w{position:relative;opacity:1;transform:none;margin-bottom:12px}.interlude .words{height:auto}}