:root{--ink:#101820;--paper:#eef1f5;--line:#c4ccd6;--blue:#0b5fd8;--amber:#f28c28}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%}
body{font:18px/1.5 Verdana,Tahoma,system-ui,sans-serif;background:var(--paper);color:var(--ink);padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
main{max-width:34rem;margin:0 auto}
.screen{padding:1.5rem 1.25rem 2rem}
.screen.dark{background:var(--ink);color:#fff;min-height:100vh;padding:0 0 1.5rem}
h1{font-size:3.2rem;line-height:1;margin:2rem 0 .75rem;letter-spacing:-.02em}
h2{font-size:1.7rem;line-height:1.2}
.lead{font-size:1.35rem;line-height:1.35}
.note{font-size:.9rem;opacity:.75}
button,select{font:inherit;min-height:3.25rem;border-radius:.75rem;border:2px solid var(--ink);background:transparent;color:inherit;padding:.5rem 1rem;width:100%;margin:.4rem 0;cursor:pointer}
button.pri{background:var(--blue);border-color:var(--blue);color:#fff;font-weight:700}
.dark button,.dark select{border-color:#fff;background:#1b2733}
button:focus-visible,select:focus-visible,input:focus-visible{outline:4px solid var(--amber);outline-offset:2px}
.plate{width:min(88vw,20rem);margin:1rem auto;border-radius:50%;box-shadow:0 0 0 3px var(--ink);background:#fff}
.plate canvas{width:100%;display:block}
.q{text-align:center;font-weight:700}
#keys{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem}
#keys button{margin:0;font-size:1.6rem;font-weight:700}
#rlist{padding-left:1.2rem}
.view{position:relative;background:#000}
#view{width:100%;display:block;max-height:68vh;object-fit:contain}
#tag{position:absolute;transform:translate(-50%,-130%);background:#fff;color:var(--ink);padding:.3rem .7rem;border-radius:.5rem;font-weight:700;pointer-events:none;white-space:nowrap}
#camerr{margin:0;padding:1rem;color:#ffd7a8}
.panel{padding:1rem 1.25rem}
.panel label{display:block;margin:.5rem 0}
input[type=range]{width:100%;height:2.5rem;accent-color:var(--amber)}
.row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:.5rem}
.row button{padding:.25rem;font-size:.9rem}
@media(prefers-reduced-motion:no-preference){.screen{animation:in .25s ease-out}@keyframes in{from{opacity:0}}}
footer{max-width:34rem;margin:0 auto;padding:1rem 1.25rem 2rem;font-size:.9rem;display:flex;flex-wrap:wrap;gap:.5rem 1.2rem}footer a,.doc a{color:var(--blue);padding:.4rem 0}.doc{max-width:40rem;margin:0 auto;padding:1.5rem 1.25rem 3rem}.doc h1{font-size:2rem;margin:.5rem 0 1rem}.doc h2{font-size:1.25rem;margin-top:1.8rem}.todo{background:#fff3cd;padding:.1rem .35rem;border-radius:.25rem}