:root{background:#f4f6f5;color:#122631;color-scheme:light;font-family:system-ui,-apple-system,sans-serif}*{box-sizing:border-box}body{margin:0;padding:24px}main{margin:0 auto;max-width:1080px}h1{font-size:clamp(1.5rem,4vw,2.4rem);line-height:1.15}p{line-height:1.55}.notice{background:#fff6da;border-left:4px solid #997200;padding:16px}.controls{background:#fff;border:1px solid #ccd6d8;border-radius:10px;display:grid;gap:16px;padding:20px}label,legend{font-weight:600}select{display:block;font:inherit;margin-top:8px;min-height:180px;padding:8px;width:100%}fieldset{border:1px solid #ccd6d8;padding:12px}#widths,.actions{display:flex;flex-wrap:wrap;gap:12px}#widths label{align-items:center;display:inline-flex;gap:5px;padding:4px 0}button{background:#133f48;border:1px solid #245058;border-radius:5px;color:#fff;cursor:pointer;font:inherit;min-height:44px;padding:8px 16px}button:disabled{background:#e1e7e7;border-color:#bbc9c9;color:#657474;cursor:not-allowed}button#stop{background:#8a3020;border-color:#8a3020}button#stop:disabled{background:#e1e7e7;border-color:#bbc9c9;color:#657474}:focus-visible{outline:3px solid #c36a00;outline-offset:3px}.ack{align-items:flex-start;display:flex;font-weight:400;gap:8px;line-height:1.5}#status{background:#e7eff0;border-radius:5px;overflow-wrap:anywhere;padding:14px}#viewport{background:#dfe6e7;border:1px solid #bdcbce;max-height:720px;overflow:auto;width:100%}#viewport:empty{display:none}#viewport iframe{border:0;display:block;flex:none;max-width:none!important;min-width:0;pointer-events:none;transform:none}#results{line-height:1.5;padding-left:24px}#results li{overflow-wrap:anywhere;padding:6px}.fail{color:#8a3020}.pass{color:#176440}.review{color:#51480c}small{color:#45565e}@media(max-width:480px){.controls,body{padding:12px}}