header{max-width:1200px;padding:10px 18px;border:0}.brand{font-size:17px}.brand-icon{font-size:22px}.local-badge{font-size:11px}
main{max-width:1200px;padding:0 16px 12px}.intro,.details,footer{display:none}
.mode-switch{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;margin:0 0 10px}
.mode-switch button{padding:11px 8px;font-size:14px;white-space:nowrap}
.lab{display:flex;flex-direction:column;border-radius:13px}.lab-top{order:0;font-size:13px;padding:12px 16px}
.video-info,.f-warning{order:1}.speed-settings{order:5}.controls{order:6;padding:12px 14px;position:relative}
.screen{order:2}.test-feedback{order:3}.test-results,.return-home{order:4}
.quick-guide{font-size:13px;line-height:1.7;color:#a2b1aa;margin:0 4px 12px}.quick-guide strong{color:#eff4ed;font-weight:600}
.screen,.screen.game-screen{height:clamp(180px,36svh,390px)}
.lab[data-running="true"] .screen{height:clamp(220px,54svh,580px)}
.screen.video-screen{height:clamp(200px,52svh,580px);aspect-ratio:auto;min-height:0}
#video-lab .screen.video-screen{width:min(100%,calc(52svh * 16 / 9));height:auto;aspect-ratio:16/9;min-height:0;margin-inline:auto}
button{font-size:14px;padding:12px 16px}.stage-controls{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.text-button{font-size:13px;margin-top:9px}#f-stop,#m-stop,#g-stop{padding:8px 16px}
#v-stop{display:none}.test-feedback,#f-feedback{font-size:12px;line-height:1.6;padding:10px 16px;min-height:0}
.speed-settings{padding:10px 16px;gap:8px;font-size:13px}.speed-settings select{padding:6px 9px}.speed-settings small{font-size:11px}
.f-warning{padding:14px 18px;font-size:16px;line-height:1.7}.warning-title{font-size:18px;margin-bottom:7px}.f-warning p{margin-bottom:10px}.f-warning label{font-size:14px}
.frequency,#f-frequency{font-size:16px;top:14px;left:16px;padding:7px 11px}
#f-overlay h2,#m-overlay h2,#g-overlay h2,#v-overlay h2{font-size:21px;margin:8px 0}
#f-copy,#m-copy,#g-copy,#v-copy{font-size:14px;line-height:1.7}
.video-info{font-size:12px;padding:9px 16px}.video-decoder{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none;left:-2px;top:0}
.return-home{padding:0 16px 10px}.return-home>.text-button{display:none}.video-download{font-size:11px;margin:4px 0}
@media(max-width:600px){
  main{padding-bottom:170px!important}.quick-guide{font-size:12px;margin-bottom:10px}.local-badge{max-width:180px;text-align:right}
  .lab:not([hidden])>.controls{position:fixed;left:0;right:0;bottom:0;z-index:20;border-top:1px solid #415045;background:#18211ff5;padding:12px 12px calc(12px + env(safe-area-inset-bottom));box-shadow:0 -8px 24px #0004}
  .lab:not([hidden])>.speed-settings{position:fixed;left:0;right:0;bottom:calc(118px + env(safe-area-inset-bottom));z-index:19;background:#18211ff5;border-top:1px solid #2b3833;padding:8px 12px}
  .stage-controls button{min-height:54px!important;font-size:14px!important}.controls .primary{min-height:48px}.controls>.primary{width:100%}
  header{padding:8px 12px}.local-badge{font-size:10px}main{padding:0 8px 8px}
  .mode-switch button{font-size:12px;padding:10px 3px;min-height:42px}
  .lab-top{padding:10px 12px;font-size:12px}.lab-top span:last-child{font-size:10px}
  .controls{padding:10px}.stage-controls button{font-size:13px;padding:12px 6px;min-height:48px}
  .stage-controls kbd{display:none}.screen,.screen.game-screen{height:clamp(160px,29svh,280px)}
  .lab[data-running="true"] .screen{height:clamp(200px,48svh,450px)}
  .screen.video-screen{height:clamp(200px,46svh,460px)}
  .f-warning{font-size:15px;padding:12px 14px}.warning-title{font-size:16px}.f-warning label{font-size:13px}
  .speed-settings small{display:none}#f-copy,#m-copy,#g-copy,#v-copy{font-size:13px}
}
@media(max-height:500px){.screen,.screen.game-screen,.screen.video-screen,.lab[data-running="true"] .screen{height:clamp(150px,42svh,250px)}.f-warning{font-size:13px;padding:10px 14px}.f-warning p{margin-bottom:6px}.warning-title{font-size:14px}.controls{padding:8px 10px}}
.display-status{font-size:12px;line-height:1.6;color:#a6c5b1;margin:0 0 12px}.pc-intro{display:none}
/* Center the main interface; keep mobile thumb controls fixed at the bottom. */
main{text-align:center}
.lab-top,.speed-settings,.f-warning label{justify-content:center}
.return-home,.video-info,.details{text-align:center}
footer{justify-content:center;align-items:center;text-align:center}
.return-home .video-download{display:inline-block;font-size:10px;line-height:1.5;color:rgba(200,219,207,.62);text-decoration:none;margin:3px 0;font-weight:400}
.return-home .video-download:hover,.return-home .video-download:focus-visible{color:#c8dbcf;text-decoration:underline}
#video-lab[data-paused="true"] #v-stop{display:block}