:root{
      --bg:#f3f6fb;
      --panel:#ffffff;
      --panel-2:#f7f9fe;
      --border:#d8e2f1;
      --text:#111827;
      --muted:#667085;
      --accent:#5b6cff;
      --accent2:#7a86ff;
      --danger:#e24d5a;
      --ok:#16a34a;
      --shadow:0 14px 40px rgba(16,24,40,.08);
      --input:#ffffff;
    }

    body[data-theme="dark"]{
      --bg:#0b0d12;
      --panel:#121622;
      --panel-2:#171c2a;
      --border:#27304a;
      --text:#e9eefc;
      --muted:#9aa6c5;
      --accent:#6d7cff;
      --accent2:#8f9bff;
      --shadow:0 10px 30px rgba(0,0,0,.28);
      --input:#0f1320;
    }

    *{box-sizing:border-box}
    html,body{margin:0;padding:0}
    body{
      color:var(--text);
      font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      line-height:1.45;
      background:
        radial-gradient(circle at top left, rgba(109,124,255,.18), transparent 26%),
        radial-gradient(circle at top right, rgba(74,222,128,.08), transparent 18%),
        var(--bg);
    }

    .wrap{
      max-width:1360px;
      margin:0 auto;
      padding:20px;
    }

    .hero, .panel, .preview-panel, .modal-card{
      background:linear-gradient(180deg, color-mix(in srgb, var(--panel) 96%, transparent), color-mix(in srgb, var(--panel-2) 96%, transparent));
      border:1px solid var(--border);
      border-radius:24px;
      box-shadow:var(--shadow);
    }

    .hero{
      padding:20px;
      margin-bottom:18px;
    }

    .hero-top{
      display:flex;
      align-items:flex-start;
      justify-content:space-between;
      gap:16px;
      flex-wrap:wrap;
    }

    .title h1{
      margin:0 0 8px;
      font-size:clamp(24px, 3vw, 36px);
      letter-spacing:-0.04em;
    }

    .title p{
      margin:0;
      max-width:900px;
      color:var(--muted);
    }

    .btn-row{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      align-items:center;
    }

    button{
      border:none;
      border-radius:14px;
      padding:11px 14px;
      font-weight:700;
      color:white;
      cursor:pointer;
      background:linear-gradient(135deg, var(--accent), #4c60ff);
      box-shadow:0 8px 16px rgba(109,124,255,.18);
      transition:.18s ease;
    }

    button:hover{transform:translateY(-1px)}
    button:active{transform:translateY(0)}
    button:disabled{opacity:.6;cursor:not-allowed;transform:none}

    .btn-secondary{
      background:linear-gradient(135deg, #2b3247, #20273a);
      box-shadow:none;
      border:1px solid var(--border);
    }

    .btn-danger{
      background:linear-gradient(135deg, #ff6b7a, #e85a68);
      box-shadow:none;
    }

    .btn-success{
      background:linear-gradient(135deg, #22c55e, #16a34a);
      box-shadow:none;
    }

    .btn-ghost{
      background:transparent;
      color:var(--text);
      border:1px solid var(--border);
      box-shadow:none;
    }

    .status{
      min-height:22px;
      margin-top:10px;
      font-size:14px;
      color:var(--muted);
    }

    .grid-layout{
      display:grid;
      grid-template-columns: 1.06fr .94fr;
      gap:18px;
      align-items:start;
    }

    .panel, .preview-panel{
      padding:18px;
    }

    .panel h2, .panel h3, .preview-panel h2{
      margin:0 0 14px;
      letter-spacing:-0.02em;
    }

    .section{
      padding-bottom:18px;
      margin-bottom:18px;
      border-bottom:1px solid color-mix(in srgb, var(--border) 82%, transparent);
    }

    .section:last-child{
      margin-bottom:0;
      padding-bottom:0;
      border-bottom:none;
    }

    .dropzone{
      border:1.5px dashed color-mix(in srgb, var(--muted) 45%, transparent);
      background:color-mix(in srgb, var(--panel-2) 76%, transparent);
      border-radius:20px;
      padding:18px;
      text-align:center;
      cursor:pointer;
      user-select:none;
      transition:.18s ease;
    }

    .dropzone:hover{
      transform:translateY(-1px);
      border-color:var(--accent2);
    }

    .dropzone strong{display:block;margin-bottom:6px}
    .dropzone small{color:var(--muted)}
    input[type="file"]{display:none}

    .controls{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:12px;
    }

    .control{
      background:color-mix(in srgb, var(--panel-2) 84%, transparent);
      border:1px solid var(--border);
      border-radius:16px;
      padding:12px;
    }

    .control.full{grid-column:1/-1}

    .control label{
      display:block;
      font-size:13px;
      color:var(--muted);
      margin-bottom:8px;
    }

    .control input[type="text"],
    .control input[type="number"],
    .control select{
      width:100%;
      background:var(--input);
      color:var(--text);
      border:1px solid var(--border);
      border-radius:12px;
      padding:10px 12px;
      outline:none;
    }

    .control input[type="range"]{width:100%}

    .inline{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      align-items:center;
    }

    .toggle{
      display:flex;
      align-items:center;
      gap:10px;
      user-select:none;
    }

    .toggle input{transform:scale(1.05)}

    .hint{
      margin-top:8px;
      font-size:13px;
      color:var(--muted);
    }

    .thumbs{
      display:grid;
      grid-template-columns:repeat(auto-fill,minmax(170px,1fr));
      gap:12px;
      margin-top:12px;
    }

    .card{
      background:color-mix(in srgb, var(--panel-2) 90%, transparent);
      border:1px solid var(--border);
      border-radius:18px;
      overflow:hidden;
      box-shadow:var(--shadow);
    }

    .card .img-wrap{
      aspect-ratio:1/1;
      background:#0e111b;
      border-bottom:1px solid var(--border);
    }

    .card img{
      width:100%;
      height:100%;
      object-fit:cover;
      display:block;
    }

    .card .meta{padding:10px}
    .card .name{
      font-size:13px;
      white-space:nowrap;
      overflow:hidden;
      text-overflow:ellipsis;
      margin-bottom:8px;
    }

    .card .actions{
      display:flex;
      gap:8px;
      flex-wrap:wrap;
    }

    .card .actions button{
      flex:1 1 auto;
      padding:9px 10px;
      border-radius:11px;
      font-size:12px;
    }

    .signature-wrap{
      background:color-mix(in srgb, var(--panel-2) 88%, transparent);
      border:1px solid var(--border);
      border-radius:18px;
      padding:12px;
    }

    canvas#sign-pad{
      width:100%;
      height:180px;
      display:block;
      background:linear-gradient(180deg, #fff, #f7f7fb);
      border-radius:14px;
      touch-action:none;
      cursor:crosshair;
    }

    .signature-tools{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:12px;
      margin-top:12px;
    }

    .modal{
      display:none;
      position:fixed;
      inset:0;
      z-index:999;
      background:rgba(3,5,10,.86);
      backdrop-filter: blur(10px);
      padding:16px;
      overflow:auto;
    }

    .modal-inner{
      max-width:1240px;
      margin:0 auto;
      min-height:100%;
      display:flex;
      flex-direction:column;
      justify-content:center;
      gap:12px;
    }

    .modal-card{
      padding:14px;
    }

    .crop-stage{
      max-height:66vh;
      display:flex;
      justify-content:center;
      align-items:center;
      overflow:hidden;
      background:#0b0f18;
      border-radius:18px;
    }

    .crop-stage img{
      display:block;
      max-width:100%;
      max-height:66vh;
    }

    .crop-actions{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:12px;
    }

    .crop-actions button{
      flex:1 1 auto;
    }

    .preview-panel{
      margin-top:18px;
    }

    .preview-header{
      display:flex;
      justify-content:space-between;
      gap:12px;
      align-items:center;
      flex-wrap:wrap;
      margin-bottom:12px;
    }

    .preview-grid{
      display:grid;
      grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
      gap:14px;
    }

    .page-card{
      background:color-mix(in srgb, var(--panel-2) 92%, transparent);
      border:1px solid var(--border);
      border-radius:18px;
      overflow:hidden;
      box-shadow:var(--shadow);
    }

    .page-card .page-title{
      padding:10px 12px;
      font-size:13px;
      color:var(--muted);
      border-bottom:1px solid var(--border);
    }

    .page-card canvas{
      width:100%;
      display:block;
      background:white;
    }

    .page-empty{
      padding:14px;
      color:var(--muted);
      font-size:14px;
    }

    .save-badge{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 12px;
      border-radius:999px;
      font-size:13px;
      background:color-mix(in srgb, var(--panel-2) 82%, transparent);
      border:1px solid var(--border);
      color:var(--muted);
    }

    .split{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:12px;
    }

    @media (max-width: 980px){
      .grid-layout{grid-template-columns:1fr}
    }

    @media (max-width: 640px){
      .controls, .signature-tools, .split{grid-template-columns:1fr}
      .wrap{padding:12px}
      .hero, .panel, .preview-panel{padding:14px;border-radius:20px}
      .thumbs{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
    }