/* Explicit mobile layout: large touch targets and controls in the thumb zone. */
.intro.pc-intro{display:block;text-align:center;margin:8px 0 16px;padding:0}
.intro.pc-intro h1{font-size:clamp(20px,5.4vw,26px);line-height:1.4;letter-spacing:-.04em;margin:0;text-wrap:balance}
.intro.pc-intro>p{display:none}
header{padding:10px 12px}.brand{font-size:16px}.version-links{display:flex;gap:10px;font-size:11px}.version-links a{color:#a2b1aa;text-decoration:none}.version-links a[href="mobile.html"]{color:#d6f78c}
main{max-width:780px;padding:0 10px 180px!important}.mode-switch{gap:5px;margin-bottom:10px}.mode-switch button{font-size:12px;min-height:44px}
.quick-guide{font-size:12px;line-height:1.7;margin-bottom:12px}.guide-title{display:block;color:#d6f78c!important;font-size:13px;margin-bottom:3px}.units-note{display:block;margin-top:3px;color:#a2b1aa;font-size:11px}
.lab:not([hidden])>.controls{position:fixed;left:0;right:0;bottom:0;z-index:20;background:#18211ff5;border-top:1px solid #415045;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;padding:8px 12px}.speed-settings small{display:none}
.stage-controls button{min-height:54px;font-size:14px;padding:12px 8px}.stage-controls kbd{display:none}.controls>.primary{width:100%;min-height:50px}
.screen,.screen.game-screen{height:clamp(170px,30svh,350px)}.lab[data-running="true"] .screen{height:clamp(200px,43svh,470px)}
#video-lab .screen.video-screen{width:100%;height:auto;aspect-ratio:16/9}
.f-warning{font-size:15px;padding:12px 14px}.warning-title{font-size:16px}.test-feedback{font-size:12px}.frequency{font-size:15px}
@media(min-width:768px){.lab:not([hidden])>.controls,.lab:not([hidden])>.speed-settings{left:50%;width:780px;right:auto;transform:translateX(-50%)}}