:root {
  --ink: #1b2c32;
  --muted: #52646a;
  --line: #cfdbd6;
  --paper: #fffefa;
  --teal: #0e7065;
  --teal-dark: #075449;
  --coral: #e66c47;
  --wash: #e6f0ea;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  font-family: "Noto Sans Thai", sans-serif;
  background-color: #e2ebe5;
  background-image: linear-gradient(135deg, rgba(255,255,255,.42) 25%, transparent 25%), linear-gradient(225deg, rgba(255,255,255,.35) 25%, transparent 25%);
  background-size: 36px 36px;
}
.app-shell { display: grid; grid-template-columns: minmax(360px, 510px) minmax(400px, 1fr); min-height: 100vh; }
.form-panel { padding: 44px clamp(24px, 4vw, 64px); background: var(--paper); box-shadow: 12px 0 30px rgba(19, 57, 48, .1); z-index: 1; }
.panel-heading { margin-bottom: 28px; }
.eyebrow { margin: 0 0 4px; color: var(--teal); font-size: .76rem; font-weight: 700; letter-spacing: .08em; }
h1 { margin: 0; font-family: Pridi, serif; font-size: 2.15rem; font-weight: 600; line-height: 1.18; }
.panel-heading > p:last-child { margin: 8px 0 0; color: var(--muted); font-size: .9rem; line-height: 1.55; }
form { display: grid; gap: 20px; }
fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
legend { margin-bottom: 10px; font-size: .88rem; font-weight: 700; }
.field-grid { display: grid; gap: 11px; }
.identity-grid { grid-template-columns: 1fr 1.6fr; }
.identity-details { display: grid; grid-column: 1 / -1; grid-template-columns: minmax(0, 1fr) 92px; gap: 11px; }
.address-grid { grid-template-columns: .75fr .65fr 1.2fr 1.2fr; }
.address-grid label:nth-child(5), .address-grid label:nth-child(6) { grid-column: span 2; }
.date-grid { grid-template-columns: 1fr 1fr; }
label { display: grid; gap: 5px; min-width: 0; color: var(--muted); font-size: .78rem; font-weight: 600; }
input, select { width: 100%; min-width: 0; border: 1px solid var(--line); border-radius: 4px; padding: 9px 10px; color: var(--ink); font: 400 .94rem "Noto Sans Thai", sans-serif; background: #fff; outline: none; }
input:focus, select:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(14,112,101,.13); }
.gender-field { display: grid; gap: 5px; color: var(--muted); font-size: .78rem; font-weight: 600; }
.gender-options { display: flex; min-height: 39px; align-items: center; gap: 11px; }
.gender-options label { display: inline-flex; grid-template-columns: 16px auto; align-items: center; gap: 4px; color: var(--ink); font-size: .79rem; font-weight: 500; cursor: pointer; }
.gender-options input { width: 16px; height: 16px; margin: 0; padding: 0; accent-color: var(--teal); }
.signature-tools { display: flex; justify-content: flex-end; gap: 8px; margin: -31px 0 8px; }
.icon-button, .upload-label { border: 1px solid var(--line); border-radius: 4px; color: var(--teal-dark); background: #fff; cursor: pointer; font: 600 .78rem "Noto Sans Thai", sans-serif; }
.icon-button { width: 31px; height: 31px; font-size: 1.1rem; }
.upload-label { padding: 5px 9px; }
.upload-label input { display: none; }
#signature-pad { display: block; width: 100%; height: 112px; border: 1px dashed #91aaa0; border-radius: 4px; background: #fcfdf9; cursor: crosshair; touch-action: none; }
.hint { margin: 6px 0 0; color: var(--muted); font-size: .72rem; }
.form-error { margin: -4px 0 0; color: #b13a26; font-size: .82rem; }
.download-button { border: 0; border-radius: 4px; padding: 13px 18px; color: #fff; background: var(--teal); cursor: pointer; font: 700 1rem "Noto Sans Thai", sans-serif; transition: background .18s, transform .18s; }
.download-button:hover { background: var(--teal-dark); transform: translateY(-1px); }
.preview-panel { padding: 44px clamp(24px, 5vw, 92px); overflow: auto; }
.preview-heading { display: flex; align-items: center; justify-content: space-between; max-width: 700px; margin: 0 auto 18px; }
#preview-status { color: var(--muted); font-size: .77rem; }
.document-wrap { max-width: 700px; margin: 0 auto; box-shadow: 0 12px 30px rgba(15, 45, 40, .2); background: white; }
#pdf-preview { display: block; width: 100%; height: auto; }
@media (max-width: 980px) { .app-shell { grid-template-columns: 1fr; } .form-panel { box-shadow: none; } .preview-panel { padding-top: 30px; } }
@media (max-width: 550px) { .form-panel, .preview-panel { padding: 28px 18px; } .identity-grid, .address-grid, .date-grid { grid-template-columns: 1fr 1fr; } .identity-grid .wide { grid-column: span 2; } h1 { font-size: 1.85rem; } }