:root{
    --paper:#F4EEDE;
    --paper-dark:#E8E0CB;
    --ink:#2B2722;
    --ink-soft:#6B6356;
    --stamp:#B23A2E;
    --confirm:#3F6B4F;
    --amber:#C9971F;
    --line:#D9D0B6;
    --shadow: 0 18px 40px -12px rgba(43,39,34,0.35);
  }
  *{box-sizing:border-box;}
  body{
    margin:0;
    font-family:'IBM Plex Sans Thai', sans-serif;
    background:
      radial-gradient(circle at 20% 10%, #2f3b35 0%, #1d2622 55%, #141b18 100%);
    color:var(--ink);
    min-height:100vh;
    padding:28px 14px 60px;
    display:flex;
    flex-direction:column;
    align-items:center;
  }
  .header{
    color:#F4EEDE;
    text-align:center;
    margin-bottom:22px;
    max-width:420px;
  }
  .header .eyebrow{
    font-family:'JetBrains Mono', monospace;
    font-size:11px;
    letter-spacing:.18em;
    text-transform:uppercase;
    color:var(--amber);
    margin-bottom:6px;
  }
  .header h1{
    font-family:'Special Elite', monospace;
    font-size:26px;
    margin:0 0 6px;
    letter-spacing:.01em;
  }
  .header p{
    font-size:13px;
    color:#cfd6cd;
    margin:0;
    line-height:1.5;
  }

  .receipt{
    width:100%;
    max-width:420px;
    background:var(--paper);
    box-shadow:var(--shadow);
    position:relative;
    padding:26px 22px 30px;
    border-radius:2px;
  }
  .receipt::before, .receipt::after{
    content:"";
    position:absolute;
    left:0; right:0;
    height:14px;
    background:
      radial-gradient(circle at 8px 50%, transparent 7px, var(--paper) 7.5px) ,
      radial-gradient(circle at 8px 50%, transparent 7px, var(--paper) 7.5px);
    background-size:16px 14px;
    background-repeat:repeat-x;
  }
  .receipt::before{ top:-7px; }
  .receipt::after{ bottom:-7px; transform:rotate(180deg); }

  .scan-zone{
    border:2px dashed var(--line);
    border-radius:6px;
    padding:26px 16px;
    text-align:center;
    cursor:pointer;
    transition:.15s;
    background:repeating-linear-gradient(135deg, rgba(0,0,0,0.015) 0 10px, transparent 10px 20px);
  }
  .scan-zone:hover{ border-color:var(--amber); background:#fbf8ee; }
  .scan-zone svg{ width:34px; height:34px; color:var(--ink-soft); margin-bottom:8px; }
  .scan-zone .main{ font-weight:600; font-size:14.5px; }
  .scan-zone .sub{ font-size:12px; color:var(--ink-soft); margin-top:3px; }
  #fileInput{ display:none; }

  .preview-img{
    width:100%; max-height:220px; object-fit:contain;
    border-radius:6px; margin-bottom:14px; background:#000;
  }

  .status-line{
    font-family:'JetBrains Mono', monospace;
    font-size:12.5px;
    color:var(--ink-soft);
    text-align:center;
    margin:14px 0 4px;
    min-height:16px;
  }
  .status-line.error{ color:var(--stamp); font-weight:600; }

  .field{ margin-bottom:14px; }
  .field label{
    display:block;
    font-size:11px;
    letter-spacing:.08em;
    text-transform:uppercase;
    color:var(--ink-soft);
    margin-bottom:5px;
    font-family:'JetBrains Mono', monospace;
  }
  .field input, .field select{
    width:100%;
    padding:10px 11px;
    border:1px solid var(--line);
    border-radius:5px;
    background:#fffdf7;
    font-size:15px;
    font-family:'IBM Plex Sans Thai', sans-serif;
    color:var(--ink);
  }
  .field input:focus, .field select:focus{ outline:2px solid var(--amber); border-color:var(--amber); }
  .amount-field input{
    font-family:'JetBrains Mono', monospace;
    font-weight:600;
    color:var(--stamp);
    font-size:19px;
  }

  .divider{
    border:none;
    border-top:1px dashed var(--line);
    margin:18px 0;
  }

  .btn{
    width:100%;
    padding:13px;
    border:none;
    border-radius:5px;
    font-size:15px;
    font-weight:600;
    cursor:pointer;
    font-family:'IBM Plex Sans Thai', sans-serif;
    transition:.12s;
  }
  .btn-confirm{ background:var(--confirm); color:#fff; margin-bottom:9px; }
  .btn-confirm:hover{ background:#345a41; }
  .btn-confirm:disabled{ background:#9aa89f; cursor:not-allowed; }
  .btn-ghost{ background:transparent; color:var(--ink-soft); border:1px solid var(--line); }
  .btn-ghost:hover{ background:var(--paper-dark); }

  .stamp-overlay{
    position:absolute; inset:0;
    display:flex; align-items:center; justify-content:center;
    background:rgba(244,238,222,0.0);
    pointer-events:none;
  }
  .stamp{
    font-family:'Special Elite', monospace;
    font-size:34px;
    color:var(--confirm);
    border:4px solid var(--confirm);
    padding:8px 22px;
    border-radius:8px;
    transform:rotate(-8deg) scale(0);
    opacity:0;
    text-transform:uppercase;
    letter-spacing:.05em;
  }
  .stamp.show{
    animation: stampIn .35s ease-out forwards;
  }
  @keyframes stampIn{
    0%{ transform:rotate(-8deg) scale(2); opacity:0; }
    60%{ transform:rotate(-8deg) scale(0.95); opacity:1; }
    100%{ transform:rotate(-8deg) scale(1); opacity:1; }
  }

  .footer-link{
    margin-top:16px;
    text-align:center;
  }
  .footer-link button{
    background:none; border:none;
    color:#9fb0a5;
    font-size:12px;
    text-decoration:underline;
    cursor:pointer;
    font-family:'IBM Plex Sans Thai', sans-serif;
  }

  .history{
    width:100%; max-width:420px;
    margin-top:22px;
  }
  .history h3{
    color:#dfe5da; font-size:13px; font-family:'JetBrains Mono', monospace;
    letter-spacing:.08em; text-transform:uppercase; margin:0 0 8px 4px;
  }
  .history-item{
    display:flex; justify-content:space-between; align-items:baseline;
    background:rgba(244,238,222,0.92);
    border-radius:5px; padding:9px 12px; margin-bottom:6px;
    font-size:13px;
  }
  .history-item .h-left{ display:flex; flex-direction:column; }
  .history-item .h-merchant{ font-weight:600; }
  .history-item .h-meta{ font-size:11px; color:var(--ink-soft); }
  .history-item .h-amount{ font-family:'JetBrains Mono', monospace; font-weight:600; color:var(--stamp); }

  .modal-backdrop{
    position:fixed; inset:0; background:rgba(20,25,22,0.7);
    display:flex; align-items:center; justify-content:center;
    z-index:50; padding:20px;
  }
  .modal{
    background:var(--paper); border-radius:8px; padding:22px;
    max-width:380px; width:100%;
  }
  .modal h3{ font-family:'Special Elite', monospace; margin:0 0 10px; font-size:18px; }
  .modal p{ font-size:13px; line-height:1.6; color:var(--ink-soft); margin:0 0 14px; }
  .modal input{
    width:100%; padding:10px; border:1px solid var(--line); border-radius:5px;
    margin-bottom:10px; font-size:13px; font-family:'JetBrains Mono', monospace;
  }
  .modal-actions{ display:flex; gap:8px; }
  .modal-actions .btn{ flex:1; }
  .hidden{ display:none !important; }