:root{
    --paper:#ffffff;
    --paper-2:#f5f6f4;
    --paper-3:#eef0ed;
    --ink:#12181a;
    --ink-2:#5b6568;
    --line:#dde2df;
    --signal:#2a5cff;
    --signal-dim:#e7edff;
    --hot:#ff6a1a;
    --good:#1f9d55;
    --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --radius: 10px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:var(--sans);
    line-height:1.5;
    -webkit-font-smoothing:antialiased;
  }
  a{color:var(--signal);}
  .visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);}

  /* ---------- bench readout bar ---------- */
  .bench-bar{
    background:var(--ink);
    color:#cfd8da;
    font-family:var(--mono);
    font-size:11px;
    letter-spacing:.04em;
    padding:6px 16px;
    display:flex;
    flex-wrap:wrap;
    gap:4px 18px;
    justify-content:center;
  }
  .bench-bar span b{color:#7fd6a8;font-weight:600;}
  .bench-bar .dim{color:#6c7679;}

  /* ---------- nav ---------- */
  .topnav{
    position:sticky; top:0; z-index:20;
    background:rgba(255,255,255,.92);
    backdrop-filter:saturate(180%) blur(6px);
    border-bottom:1px solid var(--line);
    display:flex; align-items:center; justify-content:space-between;
    padding:12px 20px;
    gap:12px;
    flex-wrap:wrap;
  }
  .logo{
    font-family:var(--mono); font-weight:700; font-size:15px;
    letter-spacing:.02em; color:var(--ink); text-decoration:none;
    display:flex; align-items:center; gap:6px;
  }
  .logo .dot{width:8px;height:8px;border-radius:2px;background:var(--signal);display:inline-block;}
  .navlinks{display:flex; gap:16px; flex-wrap:wrap; font-family:var(--mono); font-size:12px;}
  .navlinks a{color:var(--ink-2); text-decoration:none; text-transform:uppercase; letter-spacing:.05em;}
  .navlinks a:hover{color:var(--signal);}
  .crt-toggle{
    font-family:var(--mono); font-size:11px; letter-spacing:.05em;
    background:var(--paper-2); border:1px solid var(--line); border-radius:20px;
    padding:6px 12px; cursor:pointer; color:var(--ink-2);
  }
  .crt-toggle:hover{border-color:var(--signal); color:var(--signal);}

  /* ---------- hero ---------- */
  .hero{
    padding:72px 20px 56px;
    text-align:center;
    background-image: radial-gradient(var(--line) 1px, transparent 1px);
    background-size: 22px 22px;
    background-position: center top;
  }
  .eyebrow{
    font-family:var(--mono); font-size:12px; letter-spacing:.12em;
    color:var(--ink-2); text-transform:uppercase; margin-bottom:18px;
  }
  .eyebrow b{color:var(--hot);}
  .hero h1{
    font-family:var(--mono); font-weight:700;
    font-size:clamp(22px, 4vw, 40px);
    max-width:820px; margin:0 auto 18px; line-height:1.35;
  }
  .cursor{display:inline-block; width:.55em; background:var(--signal); animation:blink 1s steps(1) infinite; margin-left:2px;}
  @keyframes blink{50%{opacity:0;}}
  .hero p{
    max-width:560px; margin:0 auto; color:var(--ink-2); font-size:15px;
  }

  /* ---------- category sections ---------- */
  .category{ padding:36px 20px 8px; max-width:1080px; margin:0 auto; }
  .cat-head{
    display:flex; align-items:baseline; gap:10px; margin-bottom:20px;
    border-bottom:1px solid var(--line); padding-bottom:12px;
  }
  .cat-head .mark{color:var(--signal); font-family:var(--mono); font-weight:700;}
  .cat-head h2{font-family:var(--mono); font-size:14px; letter-spacing:.08em; text-transform:uppercase; margin:0;}
  .cat-head p{margin:0 0 0 auto; color:var(--ink-2); font-size:13px; font-family:var(--mono);}

  .tool-grid{
    display:grid; grid-template-columns:repeat(auto-fill, minmax(280px,1fr));
    gap:14px; margin-bottom:40px;
  }
  .tool{
    background:var(--paper); border:1px solid var(--line); border-radius:var(--radius);
    overflow:hidden; transition:border-color .15s ease;
  }
  .tool:hover{border-color:var(--signal);}
  .tool-head{
    width:100%; background:none; border:none; cursor:pointer; text-align:left;
    display:flex; align-items:center; gap:10px; padding:14px 16px; font:inherit; color:var(--ink);
  }
  .tool-tag{
    width:28px; height:28px; flex:none; display:flex; align-items:center; justify-content:center;
    background:var(--paper-2); border:1px solid var(--line); border-radius:6px;
    font-family:var(--mono); font-weight:700; font-size:12px; color:var(--signal);
  }
  .tool-name{font-weight:600; font-size:14.5px; flex:1;}
  .tool-sub{display:block; font-weight:400; font-size:12px; color:var(--ink-2); margin-top:2px;}
  .chev{font-family:var(--mono); color:var(--ink-2); transition:transform .15s ease;}
  .tool-head[aria-expanded="true"] .chev{transform:rotate(45deg); color:var(--signal);}
  .tool-body{padding:0 16px 18px;}
  .tool-body[hidden]{display:none;}
  .tool-desc{font-size:13px; color:var(--ink-2); margin:0 0 14px;}

  .field-row{display:flex; flex-wrap:wrap; gap:10px; margin-bottom:10px;}
  .field{flex:1; min-width:110px;}
  .field label{
    display:block; font-family:var(--mono); font-size:10.5px; letter-spacing:.05em;
    text-transform:uppercase; color:var(--ink-2); margin-bottom:4px;
  }
  .field input, .field select, .field textarea{
    width:100%; padding:8px 10px; border:1px solid var(--line); border-radius:6px;
    font-family:var(--mono); font-size:13.5px; background:var(--paper); color:var(--ink);
  }
  .field input:focus, .field select:focus, .field textarea:focus{
    outline:2px solid var(--signal); outline-offset:1px; border-color:var(--signal);
  }
  .btn{
    font-family:var(--mono); font-size:12.5px; letter-spacing:.03em;
    background:var(--ink); color:#fff; border:none; border-radius:6px;
    padding:9px 16px; cursor:pointer;
  }
  .btn:hover{background:var(--signal);}
  .btn.ghost{background:var(--paper-2); color:var(--ink); border:1px solid var(--line);}
  .btn.ghost:hover{border-color:var(--signal); color:var(--signal); background:var(--paper);}
  .btn-row{display:flex; gap:8px; flex-wrap:wrap; margin:8px 0 12px;}
  .field input[type="range"]{padding:0; border:none; background:transparent; height:28px; accent-color:var(--signal);}

  .out{
    background:var(--paper-2); border-left:3px solid var(--signal); border-radius:0 6px 6px 0;
    padding:12px 14px; font-family:var(--mono); font-size:13px; white-space:pre-wrap;
    word-break:break-word; min-height:20px;
  }
  .out .k{color:var(--ink-2);}
  .out .v{color:var(--ink); font-weight:600;}
  .out .hi{color:var(--signal); font-weight:700;}

  .swatches{display:flex; gap:6px; margin:10px 0; flex-wrap:wrap;}
  .swatch{width:26px; height:38px; border-radius:3px; border:1px solid rgba(0,0,0,.18);}

  table.ref{width:100%; border-collapse:collapse; font-size:12.5px; font-family:var(--mono);}
  table.ref th, table.ref td{ text-align:left; padding:6px 8px; border-bottom:1px solid var(--line); }
  table.ref th{color:var(--ink-2); font-weight:600; text-transform:uppercase; font-size:10.5px; letter-spacing:.04em;}

  .kb-pad{
    border:1px dashed var(--line); border-radius:8px; padding:18px; text-align:center;
    font-family:var(--mono); color:var(--ink-2); cursor:text; font-size:13px;
  }
  .kb-pad:focus{outline:2px solid var(--signal);}

  .wifi-row{display:flex; align-items:flex-end; gap:3px; height:70px; margin:10px 0;}
  .wifi-bar{flex:1; background:var(--paper-3); border-radius:3px 3px 0 0; position:relative; transition:background .15s;}
  .wifi-bar span{position:absolute; bottom:-18px; left:0; right:0; text-align:center; font-family:var(--mono); font-size:9px; color:var(--ink-2);}
  .wifi-bar.selected{background:var(--signal);}
  .wifi-bar.overlap{background:#ffd8c2;}

  footer{
    border-top:1px solid var(--line); padding:34px 20px 60px; text-align:center;
    color:var(--ink-2); font-size:12.5px; font-family:var(--mono);
  }
  footer a{color:var(--ink-2);}

  @media (max-width:640px){
    .cat-head p{display:none;}
  }

  /* ---------- CRT / phosphor easter egg ---------- */
  body.crt{ background:#04120a; color:#7dffb0; }
  body.crt .topnav{ background:rgba(4,18,10,.92); border-bottom-color:#0f3a25; }
  body.crt .logo, body.crt .navlinks a{ color:#7dffb0; }
  body.crt .hero{ background-image: radial-gradient(#0f3a25 1px, transparent 1px); }
  body.crt .hero p, body.crt .eyebrow, body.crt .cat-head p, body.crt .tool-sub, body.crt .tool-desc, body.crt .ink-2, body.crt .field label{ color:#4fae7c; }
  body.crt .tool, body.crt .field input, body.crt .field select, body.crt .field textarea{
    background:#04120a; border-color:#0f3a25; color:#7dffb0;
  }
  body.crt .tool-tag{ background:#04120a; border-color:#0f3a25; color:#7dffb0; }
  body.crt .out{ background:#06190f; border-left-color:#7dffb0; color:#7dffb0; }
  body.crt .btn{ background:#0f3a25; color:#7dffb0; }
  body.crt .btn:hover{ background:#7dffb0; color:#04120a; }
  body.crt footer{ border-top-color:#0f3a25; color:#4fae7c; }
  body.crt::before{
    content:""; position:fixed; inset:0; pointer-events:none; z-index:999;
    background:repeating-linear-gradient(0deg, rgba(0,0,0,.15) 0px, rgba(0,0,0,.15) 1px, transparent 1px, transparent 3px);
    mix-blend-mode:multiply;
  }
  @media (prefers-reduced-motion: reduce){
    .cursor{animation:none;}
    html{scroll-behavior:auto;}
  }