:root{color-scheme:dark;font-family:system-ui,sans-serif;background:#0c1524;color:#eaf0fa}
*{box-sizing:border-box}body{margin:0}main{max-width:1080px;margin:auto;padding:32px 20px}
h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.1;max-width:750px;margin:12px 0 20px}
h2{font-size:1.4rem}.eyebrow{color:#79d4df;letter-spacing:.12em;font-size:.8rem}
p{line-height:1.7;color:#c1cce0}.heading{display:flex;align-items:start;gap:20px;flex-wrap:wrap}
label{font-size:.85rem}select{display:block;margin-top:8px;padding:10px;border-radius:8px}
section{margin-top:32px}.choices{display:flex;flex-wrap:wrap;gap:10px}
button,select{font:inherit;background:#17273e;color:#eaf0fa;border:1px solid #63809e}
button{padding:12px 16px;min-height:44px;border-radius:8px;cursor:pointer}
button[aria-pressed=true]{background:#174e60;border-color:#8ae5ee}button:hover{border-color:#a7eff6}
button:disabled{opacity:.55;cursor:default}:focus-visible{outline:3px solid #ffcf79;outline-offset:3px}
.panel{padding:24px;border:1px solid #47617f;border-radius:16px;background:#111e31}
.controls{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
ol{padding-left:24px}li{padding:12px 0}pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:.85rem;line-height:1.6;background:#0c1524;padding:16px;border-radius:8px}
#result{border-left:3px solid #79d4df;padding-left:16px;margin:20px 0}
summary{cursor:pointer;padding:12px 0}aside{margin-top:28px;padding:4px 20px;border-left:3px solid #ffcf79}
a{color:#8ae5ee}footer{padding-top:28px}#progress{color:#c1cce0}
@media(max-width:500px){main{padding:20px 12px}.panel{padding:16px}button{flex-grow:1}}