:root{
    --ink:#12151C;
    --panel:#181C25;
    --panel-2:#1F2430;
    --line:#2B3140;
    --brass:#C6924F;
    --brass-dim:#8A6A3E;
    --paper:#E9E4D8;
    --paper-dim:#9A9788;
    --ok:#7FA37A;
    --err:#B8654F;
  }
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  body{
    background:var(--ink);
    color:var(--paper);
    font-family:'IBM Plex Mono', ui-monospace, monospace;
    min-height:100vh;
    -webkit-font-smoothing:antialiased;
  }
  .wrap{max-width:760px;margin:0 auto;padding:48px 20px 80px;}
  h1,h2{font-family:'Fraunces', Georgia, serif; font-weight:600; letter-spacing:-0.01em;}
  header.top{margin-bottom:44px;}
  header.top h1{font-size:clamp(28px,5vw,40px); margin:0 0 8px; color:var(--paper);}
  header.top p{color:var(--paper-dim); margin:0; font-size:14px; line-height:1.6; max-width:52ch;}
  .badge-row{display:flex; gap:8px; margin-top:18px; flex-wrap:wrap;}
  .badge{
    border:1px solid var(--line); color:var(--paper-dim); font-size:11px;
    padding:4px 9px; border-radius:100px; letter-spacing:.04em; text-transform:uppercase;
  }

  .step{
    border:1px solid var(--line);
    background:var(--panel);
    border-radius:10px;
    margin-bottom:16px;
    overflow:hidden;
    transition:border-color .2s ease;
  }
  .step.active{border-color:var(--brass-dim);}
  .step.done{display:none;}
  .step-head{
    display:flex; align-items:center; gap:14px;
    padding:16px 20px;
  }
  .step-num{
    font-family:'Fraunces', serif; font-size:15px; font-weight:600;
    width:26px; height:26px; border-radius:50%;
    display:flex; align-items:center; justify-content:center;
    border:1px solid var(--line); color:var(--paper-dim); flex-shrink:0;
  }
  .step.active .step-num{border-color:var(--brass); color:var(--brass);}
  .step.done .step-num{border-color:#3A4736; color:var(--ok); background:rgba(127,163,122,.08);}
  .step-title{font-size:14.5px; color:var(--paper); font-weight:500;}
  .step-sub{font-size:12px; color:var(--paper-dim); margin-top:2px;}
  .step-body{padding:0 20px 20px; display:none;}
  .step.active .step-body, .step.done .step-body{display:block;}

  .role-pick{display:flex; gap:10px; margin-top:6px;}
  button{
    font-family:inherit; font-size:13px; cursor:pointer;
    background:var(--panel-2); color:var(--paper); border:1px solid var(--line);
    padding:10px 16px; border-radius:7px; transition:all .15s ease;
  }
  button:hover{border-color:var(--brass-dim); color:#fff;}
  button.primary{background:var(--brass); color:#1a1400; border-color:var(--brass); font-weight:600;}
  button.primary:hover{background:#D6A263;}
  button:disabled{opacity:.35; cursor:not-allowed;}
  button:focus-visible, textarea:focus-visible, input:focus-visible{
    outline:2px solid var(--brass); outline-offset:2px;
  }

  textarea{
    width:100%; background:var(--ink); color:var(--paper);
    border:1px solid var(--line); border-radius:7px; padding:12px;
    font-family:'IBM Plex Mono', monospace; font-size:11.5px; line-height:1.5;
    resize:vertical; min-height:88px; margin-top:10px;
    scrollbar-width:thin; scrollbar-color:var(--line) var(--ink);
  }
  textarea::-webkit-scrollbar{width:10px; height:10px;}
  textarea::-webkit-scrollbar-track{background:var(--ink);}
  textarea::-webkit-scrollbar-thumb{background:var(--line); border-radius:6px; border:2px solid var(--ink);}
  textarea::-webkit-scrollbar-thumb:hover{background:var(--brass-dim);}
  textarea::-webkit-scrollbar-corner{background:var(--ink);}
  .row{display:flex; gap:10px; margin-top:10px; flex-wrap:wrap; align-items:center;}
  .hint{font-size:11.5px; color:var(--paper-dim); margin-top:8px; line-height:1.5;}
  .status-line{font-size:11.5px; margin-top:8px; display:flex; align-items:center; gap:6px;}
  .dot{width:6px; height:6px; border-radius:50%; background:var(--paper-dim); flex-shrink:0;}
  .dot.ok{background:var(--ok);}
  .dot.err{background:var(--err);}

  .fingerprint{
    display:grid; grid-template-columns:repeat(10,1fr); gap:3px;
    max-width:280px; margin:14px 0;
  }
  .fp-cell{aspect-ratio:1; border-radius:2px; background:var(--line);}
  .fp-cell.on{background:var(--brass);}

  .chat{
    border:1px solid var(--line); border-radius:10px; background:var(--panel);
    display:none;
  }
  .chat.active{display:block;}
  .chat-log{
    height:320px; overflow-y:auto; padding:16px 20px; display:flex; flex-direction:column; gap:10px;
    scrollbar-width:thin; scrollbar-color:var(--line) var(--panel);
  }
  .chat-log::-webkit-scrollbar{width:10px;}
  .chat-log::-webkit-scrollbar-track{background:var(--panel);}
  .chat-log::-webkit-scrollbar-thumb{background:var(--line); border-radius:6px; border:2px solid var(--panel);}
  .chat-log::-webkit-scrollbar-thumb:hover{background:var(--brass-dim);}
  .msg{max-width:75%; padding:9px 13px; border-radius:9px; font-size:13px; line-height:1.5;}
  .msg.me{align-self:flex-end; background:var(--brass); color:#1a1400;}
  .msg.them{align-self:flex-start; background:var(--panel-2); border:1px solid var(--line);}
  .msg.sys{align-self:center; color:var(--paper-dim); font-size:11px; background:none;}
  .msg.sys-file{align-self:center; color:var(--paper-dim); font-size:11px; background:none;}
  .chat-input{display:flex; gap:10px; padding:14px 20px; border-top:1px solid var(--line);}
  .chat-input input[type="text"]{
    flex:1; background:var(--ink); border:1px solid var(--line); border-radius:7px;
    padding:11px 13px; color:var(--paper); font-family:inherit; font-size:13px;
  }
  #btnAttach{padding:10px 13px; font-size:15px; line-height:1;}
  .file-bubble{display:flex; flex-direction:column; gap:3px;}
  .file-bubble .fname{font-weight:600; font-size:12.5px;}
  .file-bubble .fmeta{font-size:11px; opacity:.75;}
  .file-bubble a{color:inherit; text-decoration:underline;}
  .msg.me .file-bubble a{color:#1a1400;}

  footer{margin-top:40px; font-size:11px; color:var(--paper-dim); line-height:1.6;}
  a{color:var(--brass);}

  body.connected .badge-row,
  body.connected header.top p,
  body.connected footer{
    display:none;
  }
  body.connected header.top{margin-bottom:20px;}
  body.connected .wrap{padding-top:32px;}
  body.connected .chat-log{height:min(60vh,520px);}

  @media (prefers-reduced-motion: reduce){ *{transition:none !important;} }