:root{color-scheme:dark;--bg:#000;--panel:#0d0d0d;--ink:#fff;--muted:#aaa;--line:#333;--spark:#fc0}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:20px}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.6 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace}
a{color:inherit;text-underline-offset:4px}a:hover{color:var(--spark)}
button,input,select,textarea{font:inherit}button,select,input{min-height:44px}button,select,input,textarea{border:1px solid #555;border-radius:0;background:#111;color:var(--ink);padding:9px 12px}
button{cursor:pointer}button:hover{border-color:var(--spark)}button:disabled{opacity:.45;cursor:not-allowed}button[aria-pressed=true],button.active,.button-row .active{background:var(--spark);color:#000;border-color:var(--spark)}
:focus-visible{outline:3px solid var(--spark);outline-offset:3px}select,input,textarea{width:100%;max-width:100%}input[type=checkbox],input[type=radio]{width:22px;min-height:22px;accent-color:var(--spark)}
select{padding-right:28px}h1,h2,h3,p,figure{margin:0}h2{font-size:19px;font-weight:600;line-height:1.35}h3{font-size:16px;font-weight:600}p+p{margin-top:12px}label{display:block;font-size:13px;color:var(--muted);margin-bottom:7px}fieldset{margin:0;padding:0;border:0;min-width:0}legend{font-size:13px;color:var(--muted);margin-bottom:7px}
.tool-shell{width:min(1180px,calc(100% - 64px));margin:auto}.topline{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;padding:14px 0;border-bottom:1px solid var(--line)}
.home{display:flex;align-items:center;gap:10px;min-height:44px;font-size:13px;text-decoration:none;white-space:nowrap}.home img{width:36px;height:36px}.home code{font:inherit}.spark,.home .spark,.home code span{color:var(--spark)}
.section-nav{display:flex;flex-wrap:wrap;gap:0 20px;font-size:13px}.section-nav a{display:flex;align-items:center;min-height:44px;text-decoration:none}.section-nav [aria-current]{color:var(--spark)}
.skip{position:fixed;z-index:10;top:12px;left:12px;transform:translateY(-160%);padding:12px 20px;background:var(--spark);color:#000}.skip:focus{transform:translateY(0)}
.intro{padding:34px 0 27px;border-bottom:3px solid var(--ink);margin-bottom:24px}.eyebrow{text-transform:uppercase;color:var(--spark);font-size:12px;letter-spacing:.09em;margin-bottom:9px}h1{font:900 clamp(36px,5vw,64px)/1.05 Impact,Haettenschweiler,"Arial Narrow","Arial Black",sans-serif;text-transform:uppercase;letter-spacing:-.02em}.subtitle{color:var(--muted);max-width:850px;margin-top:14px;font-size:14px}
.controls,.field-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px}.controls{padding:20px;border:1px solid var(--line);background:var(--panel);margin-bottom:24px}.control{min-width:0}.control.full,.full{grid-column:1/-1}.button-row,.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:9px}.toolbar{margin-top:16px}.control small,.muted,.help,.status{color:var(--muted)}.control small{display:block;font-size:12px;margin-top:6px}
.summary{padding:24px 0;border-bottom:1px solid var(--line);margin-bottom:24px}.summary h2{font-size:clamp(23px,3vw,35px);color:var(--spark);margin-bottom:8px}.summary p{font-size:14px;color:var(--muted)}
.panel,.card{border:1px solid var(--line);background:var(--panel);padding:22px;margin-bottom:22px;min-width:0}.panel h2,.panel h3,.card h2,.card h3{margin-bottom:13px}.results-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.results-grid>.panel{margin:0}.note-pills{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.note-pills span,.chip,.badge{display:inline-flex;align-items:center;gap:7px;padding:5px 10px;border:1px solid var(--line);font-size:13px}.note-pills .root,.chip.root{border-color:var(--spark);color:var(--spark)}
.help{font-size:13px;margin:20px 0}.help h2,.help h3{color:var(--ink)}.help p{margin:10px 0}.help ul{padding-left:22px}.help a{color:var(--ink)}.status{font-size:13px;min-height:21px;margin-top:10px}.legend{font-size:12px;color:var(--muted);margin:12px 0}.table-wrap{max-width:100%;overflow:auto}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:12px;border-bottom:1px solid var(--line)}th{font-size:12px;color:var(--muted);font-weight:500}td button{white-space:nowrap}.diagram-scroll{overflow-x:auto;max-width:100%;padding-bottom:5px}.diagram-scroll svg{display:block;width:100%;height:auto;min-width:448px}.diagram-scroll svg[viewBox]{max-height:none}
.tool-footer{display:flex;flex-wrap:wrap;align-items:center;gap:0 24px;border-top:1px solid var(--line);padding:20px 0 30px;font-size:12px;color:var(--muted);margin-top:32px}.tool-footer a{display:flex;align-items:center;min-height:44px}.empty{color:var(--muted);padding:15px 0}.inline-label{display:flex;align-items:center;gap:9px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}[hidden]{display:none!important}
.instrument-pair>section,.field-grid>*{min-width:0}.note-pills{list-style:none;padding:0}.note-pills li{border:1px solid var(--line);padding:5px 10px}.note-pills li.root{border-color:var(--spark);color:var(--spark)}details summary{cursor:pointer;min-height:44px;display:list-item;padding:10px 0}.copy-fallback{min-height:160px;margin:12px 0}
@media(max-width:800px){.tool-shell{width:calc(100% - 40px)}.topline{gap:5px 16px}.section-nav{gap:0 14px}.results-grid{grid-template-columns:1fr}.panel,.card{padding:18px}.controls{padding:18px}.intro{padding-top:28px}}
@media(max-width:480px){.tool-shell{width:calc(100% - 32px)}.home{font-size:12px;gap:7px}.home img{width:30px;height:30px}.section-nav{font-size:12px;gap:0 14px}.controls,.field-grid{grid-template-columns:1fr}.controls{gap:15px;padding:16px}.panel,.card{padding:16px}.intro{padding:24px 0}.subtitle{font-size:13px}.diagram-scroll svg{min-width:420px}th,td{padding:9px}.button-row button{flex-grow:1}.tool-footer{gap:0 16px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}