:root{
    --navy:#0b1f3a;
    --navy-2:#10294a;
    --ink:#0a1422;
    --blue:#1f6feb;
    --blue-bright:#3b82f6;
    --line:#e3e8ef;
    --line-dk:#1c3354;
    --paper:#ffffff;
    --bg:#f4f6fa;
    --muted:#5b6b82;
    --good:#0f9d6b;
    --bad:#d23f4a;
    --warn:#b8860b;
    --radius:12px;
    --font:"Segoe UI",-apple-system,Roboto,Helvetica,Arial,sans-serif;
    --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  }
  *{box-sizing:border-box}
  body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);line-height:1.5}
  a{color:var(--blue)}

  /* ---- top bar (echoes signerx.signxca.com) ---- */
  header.nav{
    background:var(--navy);
    color:#fff;
    padding:14px 24px;
    display:flex;align-items:center;gap:18px;
    position:sticky;top:0;z-index:50;
    border-bottom:1px solid var(--line-dk);
  }
  .brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:19px;letter-spacing:.2px;color:#fff;text-decoration:none}
  .brand:hover{opacity:.92}
  .brand-logo{height:40px;width:auto;display:block}
  .brand .mark{
    width:34px;height:34px;border-radius:9px;
    background:linear-gradient(135deg,var(--blue),#0c4bb3);
    display:grid;place-items:center;font-weight:800;color:#fff;font-size:17px;
    box-shadow:0 2px 10px rgba(31,111,235,.4);
  }
  .brand small{font-weight:500;color:#9fb4d4;font-size:12px;display:block;letter-spacing:.3px}
  .nav .pill{
    margin-left:auto;font-size:12px;font-weight:600;color:#bcd0ef;
    border:1px solid var(--line-dk);padding:6px 12px;border-radius:999px;
  }

  /* ---- hero strip ---- */
  .hero{
    background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 60%,#0e2342 100%);
    color:#fff;padding:30px 24px 26px;
  }
  .hero h1{margin:0 0 6px;font-size:26px;letter-spacing:.2px}
  .hero h1 span{color:var(--blue-bright)}
  .hero p{margin:0;color:#aebfd9;max-width:760px;font-size:14.5px}
  .hero .tags{margin-top:14px;display:flex;gap:8px;flex-wrap:wrap}
  .hero .tags span{font-size:11.5px;font-weight:600;color:#cdddf5;border:1px solid var(--line-dk);padding:5px 10px;border-radius:999px;background:rgba(255,255,255,.03)}

  /* ---- layout ---- */
  .wrap{max-width:1280px;margin:0 auto;padding:24px;display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:24px;align-items:start}
  @media(max-width:1040px){.wrap{grid-template-columns:1fr}}

  .card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
  .card h2{margin:0;padding:15px 18px;font-size:14px;letter-spacing:.4px;text-transform:uppercase;color:var(--navy);border-bottom:1px solid var(--line);background:#fafbfd}
  .card .body{padding:18px}

  /* ---- left: pdf stage ---- */
  .uploadbar{display:flex;align-items:center;gap:12px;margin-bottom:16px}
  .btn-upload{
    border:0;background:var(--blue);color:#fff;font-size:14px;font-weight:700;
    padding:10px 18px;border-radius:9px;cursor:pointer;transition:.15s;flex:none;
  }
  .btn-upload:hover{background:#1a5fd0}
  .filename{font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

  .stage-tools{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}
  .stage-tools .seg{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
  .stage-tools .seg button{border:0;background:#fff;padding:7px 12px;font-size:13px;cursor:pointer;color:var(--navy)}
  .stage-tools .seg button.active{background:var(--navy);color:#fff}
  .stage-tools .pginfo{font-size:13px;color:var(--muted)}
  .stage-tools .hint{margin-left:auto;font-size:12px;color:var(--muted)}

  /* host shrink-wraps the canvas; overlay is sized to match the canvas exactly */
  .canvas-host{position:relative;display:block;width:max-content;max-width:100%;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff}
  #pdfCanvas{display:block;max-width:100%}
  #overlay{position:absolute;top:0;left:0;cursor:crosshair}
  .sigbox{
    position:absolute;border:2px solid var(--blue);background:rgba(31,111,235,.12);
    pointer-events:none;border-radius:3px;
  }
  .sigbox::after{
    content:attr(data-label);position:absolute;top:-20px;left:0;font-size:11px;
    background:var(--blue);color:#fff;padding:1px 6px;border-radius:4px;white-space:nowrap;font-weight:600;
  }

  .coordreadout{margin-top:12px;font-family:var(--mono);font-size:12.5px;color:var(--navy);background:#f1f6ff;border:1px solid #d4e3ff;border-radius:8px;padding:10px 12px}
  .coordreadout b{color:var(--blue)}

  /* ---- right: options ---- */
  .field{margin-bottom:13px}
  .field label{display:block;font-size:12px;font-weight:600;color:var(--navy);margin-bottom:4px}
  .field input[type=text],.field input[type=number],.field select{
    width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:7px;font-size:13px;font-family:var(--font);color:var(--ink);background:#fff;
  }
  .field input:focus,.field select:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(31,111,235,.12)}
  .grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}

  /* signature logo: upload + draw */
  .logo-controls{display:flex;flex-wrap:wrap;gap:8px}
  .btn-mini{border:0;background:var(--blue);color:#fff;font-size:12.5px;font-weight:600;padding:7px 12px;border-radius:7px;cursor:pointer;transition:.15s}
  .btn-mini:hover{background:#1a5fd0}
  .btn-mini.ghost{background:#eef2f8;color:var(--navy)}
  .btn-mini.ghost:hover{background:#e2e9f3}
  .logo-preview{margin-top:10px;border:1px solid var(--line);border-radius:8px;padding:8px;background:#fbfcfe;display:inline-block}
  .logo-preview img{max-width:240px;max-height:90px;display:block}
  .logo-preview img:not([src]){display:none}
  .sigpad-wrap{margin:12px 0;border:1px solid var(--line);border-radius:8px;padding:12px;background:#fbfcfe}
  .sigpad-label{font-size:12px;color:var(--muted);margin-bottom:8px}
  #sigpad{width:100%;max-width:100%;height:200px;background:#fff;border:1px dashed var(--line);border-radius:6px;cursor:crosshair;touch-action:none}
  .sigpad-actions{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}

  .toggle{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 0;border-bottom:1px dashed var(--line)}
  .toggle:last-child{border-bottom:0}
  .toggle .tl{font-size:13px;color:var(--ink)}
  .toggle .tl small{display:block;color:var(--muted);font-size:11px}
  .sw{position:relative;width:40px;height:22px;flex:none}
  .sw input{opacity:0;width:0;height:0}
  .sw span{position:absolute;inset:0;background:#cdd6e4;border-radius:999px;transition:.15s;cursor:pointer}
  .sw span::before{content:"";position:absolute;width:16px;height:16px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.15s;box-shadow:0 1px 3px rgba(0,0,0,.25)}
  .sw input:checked + span{background:var(--blue)}
  .sw input:checked + span::before{transform:translateX(18px)}

  .group-title{font-size:11px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:var(--muted);margin:16px 0 6px}
  .group-title:first-child{margin-top:0}

  /* ---- key + actions ---- */
  .keyrow{display:flex;gap:8px;align-items:flex-end}
  .keyrow .field{flex:1;margin-bottom:0}
  .actions{display:flex;gap:10px;margin-top:16px}
  .btn{flex:1;border:0;border-radius:9px;padding:12px;font-size:14px;font-weight:700;cursor:pointer;transition:.15s}
  .btn-primary{background:var(--blue);color:#fff}
  .btn-primary:hover{background:#1a5fd0}
  .btn-primary:disabled{background:#9bb8e8;cursor:not-allowed}
  .btn-ghost{flex:none;background:#eef2f8;color:var(--navy);padding:12px 16px}
  .btn-ghost:hover{background:#e2e9f3}

  .status{margin-top:14px;border-radius:9px;padding:12px 14px;font-size:13px;display:none}
  .status.show{display:block}
  .status.ok{background:#e7f7f0;border:1px solid #b9e7d3;color:#0c6a49}
  .status.err{background:#fdeaec;border:1px solid #f4c4c9;color:#a52630}
  .status.info{background:#eef4ff;border:1px solid #cfe0ff;color:#1f5ec4}
  .status .msg{font-weight:600;margin-bottom:6px}
  .status .dl{display:inline-block;margin-top:4px;font-weight:700}

  /* ---- payload preview ---- */
  .payload{margin-top:18px}
  .payload pre{margin:0;background:var(--ink);color:#d6e2f5;font-family:var(--mono);font-size:11.5px;line-height:1.45;padding:14px;border-radius:9px;overflow:auto;max-height:320px}
  .payload pre .k{color:#7fc4ff}.payload pre .s{color:#8ee6a8}.payload pre .b{color:#ffb86b}.payload pre .n{color:#ff9ec7}
  .copybtn{float:right;background:#1c3354;color:#cfe0ff;border:0;font-size:11px;padding:4px 9px;border-radius:6px;cursor:pointer;margin:-2px 0 8px}

  footer{padding:22px 24px;text-align:center;color:var(--muted);font-size:12px}
  footer b{color:var(--navy)}