:root{
    --paper:#F7F4EE;
    --paper-line:#E1DBCB;
    --card:#FFFFFF;
    --ink:#1C2B3A;
    --ink-soft:#5B6B78;
    --ink-faint:#8B968F;
    --wax:#8C2F39;
    --wax-dark:#6E232B;
    --wax-tint:#F3E3E1;
    --brass:#A9803F;
    --brass-tint:#F1E7D3;
    --signed:#3F6C51;
    --signed-tint:#E4EEE6;
    --pending:#A97A2E;
    --pending-tint:#F5EBD9;
    --shadow: 0 18px 40px -20px rgba(28,43,58,0.35);
    --shadow-sm: 0 6px 16px -10px rgba(28,43,58,0.3);
  }
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  body{
    background:var(--paper);
    background-image:
      linear-gradient(var(--paper-line) 1px, transparent 1px);
    background-size: 100% 42px;
    color:var(--ink);
    font-family:'IBM Plex Sans', sans-serif;
    font-size:15px;
    line-height:1.55;
    -webkit-font-smoothing:antialiased;
  }
  #app{max-width:1040px;margin:0 auto;padding:28px 22px 80px;}
  h1,h2,h3{font-family:'Fraunces', serif; font-weight:600; color:var(--ink); margin:0 0 6px;}
  a{color:var(--wax);}
  button{font-family:inherit;}
  .muted{color:var(--ink-soft);}
  .faint{color:var(--ink-faint); font-size:13px;}

  /* ---------- header ---------- */
  .topbar{display:flex; align-items:center; justify-content:space-between; gap:16px; margin-bottom:34px; flex-wrap:wrap;}
  .brand{display:flex; align-items:center; gap:14px; cursor:pointer;}
  .brand-text h1{font-size:26px; letter-spacing:0.2px; margin:0;}
  .brand-text .tag{font-size:12.5px; color:var(--ink-soft); margin-top:1px;}
  .topbar-actions{display:flex; gap:10px;}

  .seal-svg{display:block;}

  /* ---------- buttons ---------- */
  .btn{
    display:inline-flex; align-items:center; justify-content:center; gap:8px;
    border-radius:4px; border:1.5px solid var(--ink); background:transparent; color:var(--ink);
    padding:10px 18px; font-size:14px; font-weight:600; cursor:pointer;
    transition:transform .08s ease, background .15s ease, color .15s ease, border-color .15s ease;
  }
  .btn:hover{background:var(--ink); color:var(--paper);}
  .btn:active{transform:translateY(1px);}
  .btn:disabled{opacity:.4; cursor:not-allowed; pointer-events:none;}
  .btn-primary{background:var(--wax); border-color:var(--wax); color:#fff;}
  .btn-primary:hover{background:var(--wax-dark); border-color:var(--wax-dark); color:#fff;}
  .btn-ghost{border-color:var(--paper-line); color:var(--ink-soft);}
  .btn-ghost:hover{background:var(--ink); border-color:var(--ink); color:var(--paper);}
  .btn-sm{padding:6px 12px; font-size:12.5px; border-radius:3px;}
  .btn-danger{border-color:var(--wax); color:var(--wax);}
  .btn-danger:hover{background:var(--wax); border-color:var(--wax); color:#fff;}
  .link-btn{background:none; border:none; color:var(--wax); font-weight:600; cursor:pointer; padding:0; font-size:13.5px;}

  /* ---------- layout shell for the create/sign flow ---------- */
  .shell{display:grid; grid-template-columns:200px 1fr; gap:36px; align-items:start;}
  @media (max-width:760px){ .shell{grid-template-columns:1fr;} .rail{display:none;} .rail-mobile{display:flex !important;} }
  .rail{display:flex; flex-direction:column; gap:2px; position:sticky; top:20px;}
  .rail-mobile{display:none; gap:10px; margin-bottom:20px; overflow-x:auto;}
  .rail-step{display:flex; align-items:flex-start; gap:10px; padding:10px 0; position:relative;}
  .rail-step:not(:last-child)::after{content:""; position:absolute; left:11px; top:32px; width:1px; height:22px; background:var(--paper-line);}
  .rail-num{width:23px; height:23px; border-radius:50%; border:1.5px solid var(--paper-line); display:flex; align-items:center; justify-content:center; font-size:12px; font-weight:600; color:var(--ink-faint); flex-shrink:0; background:var(--paper);}
  .rail-step.active .rail-num{border-color:var(--wax); color:var(--wax); background:var(--wax-tint);}
  .rail-step.done .rail-num{border-color:var(--signed); color:#fff; background:var(--signed);}
  .rail-label{font-size:13.5px; font-weight:600; color:var(--ink-faint); padding-top:2px;}
  .rail-step.active .rail-label{color:var(--ink);}
  .rail-step.done .rail-label{color:var(--ink-soft);}

  /* ---------- cards / page ---------- */
  .page-card{background:var(--card); border:1px solid var(--paper-line); border-radius:6px; box-shadow:var(--shadow-sm); padding:30px 32px;}
  .section-title{font-size:20px; margin-bottom:4px;}
  .hr{height:1px; background:var(--paper-line); border:none; margin:22px 0;}
  .field{margin-bottom:16px;}
  .field label{display:block; font-size:12.5px; font-weight:600; color:var(--ink-soft); margin-bottom:6px;}
  .field input[type=text], .field input[type=email]{
    width:100%; padding:10px 12px; border:1.5px solid var(--paper-line); border-radius:4px;
    font-size:14px; font-family:inherit; color:var(--ink); background:#fff;
  }
  .field input:focus{outline:2px solid var(--brass); outline-offset:1px; border-color:var(--brass);}

  /* ---------- dashboard ---------- */
  .empty-state{text-align:center; padding:70px 20px; border:1.5px dashed var(--paper-line); border-radius:6px;}
  .empty-state h2{margin-bottom:8px;}
  .env-list{display:flex; flex-direction:column; gap:12px;}
  .env-row{
    display:flex; align-items:center; justify-content:space-between; gap:16px;
    background:var(--card); border:1px solid var(--paper-line); border-radius:6px; padding:18px 20px;
    cursor:pointer; transition:box-shadow .15s ease, transform .1s ease;
  }
  .env-row:hover{box-shadow:var(--shadow-sm); transform:translateY(-1px);}
  .env-row-main h3{font-size:16.5px; margin-bottom:4px;}
  .env-progress{display:flex; gap:5px; margin-top:8px;}
  .dot{width:8px; height:8px; border-radius:50%; background:var(--paper-line);}
  .dot.signed{background:var(--signed);}
  .dot.turn{background:var(--pending);}
  .badge{font-size:11.5px; font-weight:700; padding:4px 9px; border-radius:3px; white-space:nowrap;}
  .badge-progress{background:var(--pending-tint); color:var(--pending);}
  .badge-done{background:var(--signed-tint); color:var(--signed);}

  /* ---------- upload ---------- */
  .upload-tabs{display:flex; gap:8px; margin-bottom:20px; flex-wrap:wrap;}
  .tab-btn{padding:8px 16px; border-radius:4px; border:1.5px solid var(--paper-line); background:#fff; color:var(--ink-soft); font-weight:600; font-size:13.5px; cursor:pointer;}
  .tab-btn.active{border-color:var(--wax); color:var(--wax); background:var(--wax-tint);}
  .dropzone{border:1.5px dashed var(--paper-line); border-radius:6px; padding:44px 20px; text-align:center; color:var(--ink-soft);}
  .dropzone.drag{border-color:var(--brass); background:var(--brass-tint);}
  .file-chip{display:inline-flex; align-items:center; gap:8px; background:var(--brass-tint); border:1px solid var(--brass); color:var(--ink); padding:7px 12px; border-radius:4px; font-size:13px; margin-top:10px;}

  /* ---------- document preview ---------- */
  .doc-preview{background:#EFEAE0; border:1px solid var(--paper-line); border-radius:6px; padding:20px; display:flex; flex-direction:column; gap:14px; align-items:center;}
  .doc-page-img{max-width:100%; border:1px solid var(--paper-line); box-shadow:var(--shadow-sm); background:#fff;}
  .doc-html-preview{background:#fff; border:1px solid var(--paper-line); padding:24px; max-height:420px; overflow-y:auto; width:100%; font-size:13.5px; line-height:1.6;}
  .doc-fallback{padding:40px; color:var(--ink-soft); text-align:center;}

  /* ---------- signers ---------- */
  .signer-row{display:grid; grid-template-columns:30px 1fr 1fr auto; gap:12px; align-items:center; padding:12px 0; border-bottom:1px solid var(--paper-line);}
  @media (max-width:600px){ .signer-row{grid-template-columns:24px 1fr; row-gap:8px;} .signer-row input{grid-column:1/3;} }
  .order-num{width:26px; height:26px; border-radius:50%; background:var(--brass-tint); color:var(--brass); font-weight:700; font-size:12.5px; display:flex; align-items:center; justify-content:center;}
  .signer-row input{padding:8px 10px; border:1.5px solid var(--paper-line); border-radius:4px; font-size:13.5px; font-family:inherit;}
  .row-actions{display:flex; gap:4px;}
  .icon-btn{width:26px; height:26px; border-radius:3px; border:1.5px solid var(--paper-line); background:#fff; color:var(--ink-soft); cursor:pointer; font-size:13px; display:flex; align-items:center; justify-content:center;}
  .icon-btn:hover{border-color:var(--wax); color:var(--wax);}
  .toggle-row{display:flex; align-items:center; gap:10px; margin-top:18px;}
  .switch{position:relative; width:40px; height:22px; flex-shrink:0;}
  .switch input{opacity:0; width:0; height:0;}
  .slider{position:absolute; inset:0; background:var(--paper-line); border-radius:20px; cursor:pointer; transition:.15s;}
  .slider::before{content:""; position:absolute; width:16px; height:16px; left:3px; top:3px; background:#fff; border-radius:50%; transition:.15s;}
  input:checked + .slider{background:var(--wax);}
  input:checked + .slider::before{transform:translateX(18px);}
  .warn-text{color:var(--wax); font-size:13px; margin-top:8px;}

  /* ---------- cert / signature block panel ---------- */
  .sig-block-panel{margin-top:26px; display:flex; flex-direction:column; gap:14px;}
  .sig-block{border:1px solid var(--paper-line); border-radius:6px; padding:16px 18px; background:#fff;}
  .sig-block.is-active{border-color:var(--wax); box-shadow:0 0 0 3px var(--wax-tint);}
  .sig-block-head{display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap;}
  .sig-who{display:flex; align-items:center; gap:10px;}
  .sig-status{font-size:12px; font-weight:700; padding:3px 9px; border-radius:3px;}
  .sig-status.pending{background:var(--pending-tint); color:var(--pending);}
  .sig-status.signed{background:var(--signed-tint); color:var(--signed);}
  .sig-status.waiting{background:#EFEAE0; color:var(--ink-faint);}
  .sig-img{max-height:60px; max-width:220px; margin-top:10px;}

  /* ---------- signing panel ---------- */
  .sign-method-tabs{display:flex; gap:8px; margin:16px 0 14px; flex-wrap:wrap;}
  canvas.pad{border:1.5px dashed var(--paper-line); border-radius:4px; touch-action:none; background:#fff; width:100%; max-width:420px; height:150px;}
  .typed-preview{font-size:40px; padding:14px 10px; border-bottom:2px solid var(--ink); color:var(--ink); min-height:60px; display:flex; align-items:center;}
  .font-choice{display:flex; gap:8px; margin-top:10px;}
  .consent{display:flex; align-items:flex-start; gap:10px; margin-top:18px; font-size:13.5px; color:var(--ink-soft);}
  .consent input{margin-top:3px;}

  /* ---------- audit trail ---------- */
  .audit-log{display:flex; flex-direction:column; gap:0;}
  .audit-item{display:flex; gap:12px; padding:9px 0; border-bottom:1px solid var(--paper-line); font-size:13px;}
  .audit-item:last-child{border-bottom:none;}
  .audit-time{color:var(--ink-faint); white-space:nowrap; font-size:12px; padding-top:1px;}

  /* ---------- toast / modal ---------- */
  .overlay{position:fixed; inset:0; background:rgba(28,43,58,0.55); display:flex; align-items:center; justify-content:center; padding:20px; z-index:50;}
  .modal{background:var(--card); border-radius:8px; max-width:560px; width:100%; max-height:85vh; overflow-y:auto; padding:28px 30px; box-shadow:var(--shadow);}
  .email-preview{background:var(--paper); border:1px solid var(--paper-line); border-radius:5px; padding:14px 16px; margin-bottom:12px; font-size:13px;}
  .email-preview .em-line{margin-bottom:3px;}
  .email-preview .em-label{color:var(--ink-faint); font-weight:600; margin-right:5px;}

  /* ---------- seal reveal ---------- */
  .seal-reveal{display:flex; flex-direction:column; align-items:center; gap:14px; padding:30px 10px 10px;}
  @keyframes stampDown{
    0%{transform:translateY(-90px) scale(1.5) rotate(-10deg); opacity:0;}
    55%{transform:translateY(6px) scale(1.06) rotate(3deg); opacity:1;}
    100%{transform:translateY(0) scale(1) rotate(0deg); opacity:1;}
  }
  .stamp-anim{animation:stampDown .75s cubic-bezier(.22,.8,.32,1) both;}
  @media (prefers-reduced-motion: reduce){ .stamp-anim{animation:none;} }

  .fingerprint{font-family:monospace; font-size:11.5px; word-break:break-all; color:var(--ink-soft); background:var(--paper); border:1px solid var(--paper-line); padding:8px 10px; border-radius:4px;}
  .kicker{font-size:12.5px; color:var(--ink-faint); margin-bottom:2px;}
  .banner{border-radius:5px; padding:12px 16px; font-size:13.5px; margin-bottom:18px;}
  .banner-info{background:var(--brass-tint); color:#7A5B22; border:1px solid var(--brass);}
  .banner-warn{background:#F5EBD9; color:#8A5A16; border:1px solid var(--pending);}