:root{
  --night:#120e26;
  --night-2:#1b1539;
  --tube:#a9dcf5;
  --tube-dim:#5f8fa8;
  --tube-deep:#3d6b82;
  --pink:#f7c9df;
  --ink:#ece6ff;
  --ink-dim:#a79dc9;
  --line:rgba(169,220,245,.22);
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --sans:ui-sans-serif,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --pad:clamp(16px,4vw,40px);
}
*{box-sizing:border-box}
/* hidden 必须真的隐藏：下面 .cover/.loader 都写了 display:flex，
   会盖过浏览器默认的 [hidden]{display:none}，引擎控制显隐就失灵了。 */
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body.chassis{margin:0;background:var(--night);color:var(--ink);font:16px/1.7 var(--sans);
  background-image:radial-gradient(900px 480px at 12% -10%,rgba(169,220,245,.10),transparent 60%),radial-gradient(700px 420px at 96% 4%,rgba(247,201,223,.07),transparent 62%);
  background-attachment:fixed}
body.chassis::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:9;
  background:repeating-linear-gradient(to bottom,rgba(0,0,0,.16) 0 1px,transparent 1px 3px);opacity:.5}
body.in-tube{background:var(--night)}
body.in-tube::after{display:none}
a{color:var(--tube);text-decoration:none;border-bottom:1px solid rgba(169,220,245,.3)}
a:hover{color:#fff;border-bottom-color:var(--pink)}

/* masthead */
.masthead{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 18px;padding:18px var(--pad);border-bottom:1px solid var(--line)}
.brand{display:inline-flex;align-items:center;gap:10px;border:0;font:600 20px/1 var(--mono);letter-spacing:.16em;text-transform:lowercase;color:var(--tube)}
.brand-lamp{width:9px;height:9px;border-radius:50%;background:var(--pink);box-shadow:0 0 10px var(--pink);animation:blip 4.5s infinite}
@keyframes blip{0%,92%,100%{opacity:1}94%{opacity:.2}96%{opacity:1}}
.brand-sub{font:11px/1 var(--mono);letter-spacing:.22em;text-transform:uppercase;color:var(--ink-dim)}
.nav{margin-left:auto;display:flex;flex-wrap:wrap;gap:6px 20px;font:12px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase}
.nav a{border:0;color:var(--ink-dim)}
.nav a:hover{color:var(--tube)}

.main{max-width:1080px;margin:0 auto;padding:clamp(20px,3.5vw,38px) var(--pad) 56px}

/* headline block */
.marquee{text-align:center;margin:0 0 18px}
.marquee h1{margin:0;font:700 clamp(30px,7vw,58px)/1.02 var(--mono);letter-spacing:.06em;text-transform:uppercase;
  color:var(--tube);text-shadow:0 0 18px rgba(169,220,245,.45),0 0 42px rgba(169,220,245,.18)}
.marquee .kicker{margin:10px 0 0;font:11px/1.5 var(--mono);letter-spacing:.24em;text-transform:uppercase;color:var(--ink-dim)}

/* the tube */
.cabinet{position:relative;background:linear-gradient(180deg,#241c48,#191233 62%,#160f2d);
  border:1px solid rgba(169,220,245,.28);border-radius:26px;padding:clamp(10px,2vw,18px);
  box-shadow:0 0 0 1px rgba(0,0,0,.5),0 30px 70px -30px rgba(0,0,0,.9),inset 0 1px 0 rgba(255,255,255,.07)}
.stage{position:relative;aspect-ratio:16/9;width:100%;border-radius:16px;overflow:hidden;background:#0a0818;
  box-shadow:inset 0 0 0 1px rgba(169,220,245,.18),inset 0 0 60px rgba(0,0,0,.85)}
.stage>*{position:absolute;inset:0}
.scan{position:absolute;inset:0;pointer-events:none;z-index:6;
  background:repeating-linear-gradient(to bottom,rgba(169,220,245,.055) 0 1px,transparent 1px 4px);opacity:.85}
.scan::after{content:"";position:absolute;inset:0;background:radial-gradient(120% 90% at 50% 50%,transparent 55%,rgba(6,4,16,.75) 100%)}

.cover{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:clamp(10px,2vw,18px);
  background:radial-gradient(circle at 50% 42%,#2b2154,#150f2c 72%);padding:16px;text-align:center;cursor:pointer;z-index:2}
.cover-title{font:700 clamp(18px,4vw,34px)/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--tube);text-shadow:0 0 22px rgba(169,220,245,.5)}
.cover-art{width:min(46%,240px);height:auto;filter:drop-shadow(0 0 26px rgba(169,220,245,.35))}
.cover-sub{font:10px/1.6 var(--mono);letter-spacing:.2em;text-transform:uppercase;color:var(--ink-dim);max-width:34ch}
.play{appearance:none;border:0;cursor:pointer;font:700 14px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;
  color:#10122a;background:var(--tube);padding:15px 32px;border-radius:999px;
  box-shadow:0 0 0 2px rgba(169,220,245,.35),0 0 34px rgba(169,220,245,.4);transition:transform .12s,box-shadow .2s}
.play:hover{transform:translateY(-1px);box-shadow:0 0 0 3px var(--pink),0 0 40px rgba(247,201,223,.55)}
.play:focus-visible{outline:2px solid var(--pink);outline-offset:4px}

.loader{display:none;flex-direction:column;align-items:center;justify-content:center;gap:14px;z-index:4;background:#0d0a1e}
.stage[data-gf-state="loading"] .loader{display:flex}
.stage[data-gf-state="loading"] .cover{display:none}
/* 游戏已经在播时封面必须彻底让位：封面 z-index 高于普通 iframe，
   不隐藏会一直盖在游戏上面，再点按钮又被 started 锁死，看起来就是没反应。 */
.stage[data-gf-state="playing"] .cover{display:none}
.rew{font:700 clamp(16px,3vw,26px)/1 var(--mono);letter-spacing:.3em;color:var(--tube);animation:rew 1.1s steps(2,end) infinite}
@keyframes rew{0%,49%{opacity:1}50%,100%{opacity:.25}}
.rew-bar{width:min(60%,280px);height:3px;background:rgba(169,220,245,.18);overflow:hidden;border-radius:2px}
.rew-bar i{display:block;height:100%;width:40%;background:var(--pink);animation:rewbar 1.5s ease-in-out infinite}
@keyframes rewbar{0%{transform:translateX(-100%)}100%{transform:translateX(350%)}}
.rew-label{font:10px/1 var(--mono);letter-spacing:.28em;text-transform:uppercase;color:var(--ink-dim)}

.tube-iframe{width:100%;height:100%;border:0;display:block}
/* 播放器插进来的 iframe 要压在封面（2）之上、加载层（4）之下 */
.stage iframe{z-index:3}

/* controls under the tube */
.controls{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:14px 0 0;padding:0;list-style:none}
.ctrl{display:inline-flex;align-items:center;gap:8px;font:11px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;
  background:rgba(169,220,245,.06);border:1px solid var(--line);color:var(--ink);padding:11px 16px;border-radius:999px;cursor:pointer;appearance:none}
.ctrl:hover{border-color:var(--tube);color:#fff}
.ctrl[aria-pressed="true"]{background:rgba(247,201,223,.16);border-color:var(--pink);color:#fff}
.ctrl .num{color:var(--tube)}
.share-note{font:10px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--pink);opacity:0;transition:opacity .25s}
.share-note.on{opacity:1}

.disclaimer{margin:16px 0 0;padding:12px 16px;border-left:2px solid var(--pink);background:rgba(247,201,223,.06);
  font-size:13.5px;color:var(--ink-dim);border-radius:0 8px 8px 0}
.disclaimer strong{color:var(--pink);font-weight:600}

/* prose */
.prose{max-width:74ch;margin:0 auto}
.prose h2{margin:38px 0 10px;font:700 clamp(17px,2.6vw,23px)/1.25 var(--mono);letter-spacing:.04em;color:var(--tube);text-transform:none}
.prose h2::before{content:"▸ ";color:var(--pink);opacity:.8}
.prose h3{margin:24px 0 6px;font:600 15px/1.4 var(--sans);color:#fff;letter-spacing:.01em}
.prose p{margin:0 0 13px;color:#d9d2f2}
.prose li{margin:0 0 7px;color:#d9d2f2}
.prose ul,.prose ol{padding-left:22px;margin:0 0 15px}
.prose strong{color:#fff}
.prose code{font:13px/1 var(--mono);background:rgba(169,220,245,.1);border:1px solid var(--line);padding:2px 6px;border-radius:5px;color:var(--tube)}
.prose blockquote{margin:18px 0;padding:12px 18px;border-left:2px solid var(--tube);background:rgba(169,220,245,.05);color:var(--ink-dim)}
.prose table{width:100%;border-collapse:collapse;margin:8px 0 18px;font-size:14px}
.prose th,.prose td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line)}
.prose th{font:11px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-dim)}

/* faq */
.faq{margin:10px 0 0}
.faq details{border-bottom:1px solid var(--line);padding:12px 0}
.faq summary{cursor:pointer;font:600 15px/1.45 var(--sans);color:#fff;list-style:none;display:flex;gap:10px;align-items:flex-start}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";font-family:var(--mono);color:var(--pink);flex:0 0 auto}
.faq details[open] summary::before{content:"−"}
.faq p{margin:9px 0 0 20px;font-size:14.5px;color:var(--ink-dim)}

/* comments */
.talkbox{margin:44px 0 0;padding:22px var(--pad);border:1px solid var(--line);border-radius:20px;background:rgba(27,21,57,.55)}
.talkbox h2{margin:0 0 4px;font:700 17px/1.3 var(--mono);letter-spacing:.06em;color:var(--tube);text-transform:uppercase}
.talkbox .lede{margin:0 0 16px;font-size:13.5px;color:var(--ink-dim)}
.cform{display:grid;gap:9px;margin:0 0 20px}
.cform input,.cform textarea{width:100%;background:#0e0b20;border:1px solid var(--line);color:var(--ink);border-radius:10px;padding:11px 13px;font:14px/1.5 var(--sans)}
.cform input:focus,.cform textarea:focus{outline:0;border-color:var(--tube);box-shadow:0 0 0 3px rgba(169,220,245,.14)}
.cform textarea{min-height:88px;resize:vertical}
.cform button{justify-self:start;appearance:none;border:1px solid var(--tube);background:transparent;color:var(--tube);
  font:700 11px/1 var(--mono);letter-spacing:.18em;text-transform:uppercase;padding:11px 22px;border-radius:999px;cursor:pointer}
.cform button:hover{background:var(--tube);color:#10122a}
.cmsg{font:12px/1.5 var(--mono);color:var(--pink);min-height:18px}
.clist{display:grid;gap:14px;margin:0;padding:0;list-style:none}
.clist[data-gf-empty]::before{content:"No one has written on the wall yet. Tell us your best score, or leave a hint for the next visitor.";display:block;font-size:14px;color:var(--ink-dim);padding:14px 0}
.comment{border-top:1px solid var(--line);padding:14px 0 0}
.comment[data-gf-owner]{background:rgba(247,201,223,.05);border-left:2px solid var(--pink);padding-left:12px;border-radius:0 8px 8px 0}
.c-head{display:flex;gap:10px;align-items:baseline;font:11px/1 var(--mono);letter-spacing:.1em;color:var(--ink-dim)}
.c-name{color:var(--tube);font-weight:700}
.owner-tag{display:none;font:9px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;background:var(--pink);color:#1a1030;padding:3px 6px;border-radius:4px}
[data-gf-owner] .owner-tag{display:inline-block}
.c-text{margin:8px 0 6px;font-size:14.5px;color:#ded7f5;white-space:pre-wrap}
.c-tools{display:flex;gap:14px;align-items:center;font:10px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase}
.c-reply-btn{appearance:none;background:none;border:0;padding:0;color:var(--ink-dim);cursor:pointer;font:inherit;letter-spacing:inherit;text-transform:inherit}
.c-reply-btn:hover{color:var(--tube)}
.c-replies{margin:12px 0 0;padding:0 0 0 14px;list-style:none;border-left:1px solid var(--line)}
.c-to{color:var(--pink)}

/* footer */
.signoff{margin-top:56px;border-top:1px solid var(--line);padding:30px var(--pad) 40px;background:rgba(10,8,22,.55)}
.signoff-inner{max-width:1080px;margin:0 auto;display:grid;gap:9px}
.signoff-brand{margin:0;font:600 14px/1 var(--mono);letter-spacing:.18em;text-transform:lowercase;color:var(--tube)}
.signoff-line{margin:0;max-width:62ch;font-size:13.5px;color:var(--ink-dim)}
.signoff-nav{display:flex;flex-wrap:wrap;gap:6px 18px;font:11px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase}
.signoff-copy{margin:6px 0 0;font:11px/1.6 var(--mono);color:var(--tube-deep)}

/* simple pages */
.sheet{max-width:74ch;margin:0 auto}
.sheet h1{margin:0 0 6px;font:700 clamp(24px,4.6vw,38px)/1.1 var(--mono);letter-spacing:.02em;color:var(--tube);text-transform:none}
.sheet .stamp{font:10px/1 var(--mono);letter-spacing:.24em;text-transform:uppercase;color:var(--ink-dim);margin:0 0 24px}

@media(max-width:640px){
  .masthead{padding-bottom:14px}
  .nav{margin-left:0;width:100%;font-size:11px;gap:6px 14px}
  .brand-sub{display:none}
  .controls{gap:8px}
  .ctrl{padding:9px 13px;font-size:10px}
  .signoff{padding-bottom:32px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
}