:root {
  --green-900: #0e3b2e;
  --green-700: #1f7a4d;
  --green-600: #2e9e5b;
  --green-100: #e7f5ec;
  --ink: #1c2523;
  --muted: #5c6b66;
  --border: #d8e2dd;
  --bg: #f4f7f5;
  --card: #ffffff;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(16, 40, 30, 0.08), 0 1px 2px rgba(16, 40, 30, 0.06);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  overflow-x: hidden;
  max-width: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.app { display: flex; flex-direction: column; min-height: 100vh; }

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--green-900);
  color: #fff;
  flex-wrap: wrap;
  gap: 10px;
}
.brand { display: flex; align-items: center; gap: 8px; font-size: 18px; font-weight: 700; }
.brand-icon { font-size: 22px; }
.tabs { display: flex; gap: 6px; }
.tab {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}
.tab.active { background: var(--green-600); border-color: var(--green-600); }

main { flex: 1; padding: 20px; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- Workspace ---------- */
.workspace {
  display: grid;
  grid-template-columns: minmax(340px, 460px) 1fr;
  gap: 20px;
  align-items: start;
}
.workspace > * { min-width: 0; }
@media (max-width: 980px) {
  .workspace { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  main { padding: 12px; }
  .field-group.grid-2, .field-group.grid-3 { grid-template-columns: 1fr; }
  .field-group.grid-3 .span-2 { grid-column: auto; }
  .action-row { flex-direction: column; }
  .action-row button { width: 100%; }
  .topbar { padding: 10px 14px; }
  .brand-text { font-size: 15px; }
  .tabs { width: 100%; }
  .tab { flex: 1; text-align: center; padding: 8px 6px; }
}

/* ---------- Form ---------- */
.form-panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.field-group { display: flex; flex-direction: column; gap: 6px; }
.field-group.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field-group.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.field-group.grid-3 .span-2 { grid-column: span 2; }
.field-group > div { display: flex; flex-direction: column; gap: 6px; }

label { font-size: 12.5px; font-weight: 600; color: var(--muted); }
.group-label { font-size: 13px; font-weight: 700; color: var(--ink); text-transform: uppercase; letter-spacing: .03em; }
.group-label-row { display: flex; align-items: center; justify-content: space-between; }

input[type=text], input[type=number], input[type=date], select {
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  width: 100%;
  background: #fff;
  color: var(--ink);
}
input:focus, select:focus { outline: 2px solid var(--green-600); outline-offset: 1px; }
input[readonly] { background: var(--green-100); }

.radio-row { display: flex; gap: 10px; flex-wrap: wrap; }
.radio-pill {
  display: flex; align-items: center; gap: 6px;
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}
.radio-pill:has(input:checked) { background: var(--green-100); border-color: var(--green-600); color: var(--green-700); }

.checkbox-row { display: flex; align-items: flex-start; gap: 8px; font-size: 13px; font-weight: 500; color: var(--ink); }
.checkbox-row input { margin-top: 3px; }

.sig-pad-wrap { margin-top: 8px; display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
#sig-pad { border: 1px dashed var(--border); border-radius: 8px; background: #fff; touch-action: none; }

.med-table-wrap { display: flex; flex-direction: column; gap: 8px; }
.med-input-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.med-input-table th { text-align: left; font-size: 11px; color: var(--muted); padding: 4px 4px; }
.med-input-table td { padding: 3px 4px; }
.med-input-table input { padding: 6px 8px; font-size: 13px; }
.med-input-table .qty-col, .med-input-table .rate-col { width: 70px; }
.med-input-table .total-col { width: 80px; }
.row-total { font-weight: 600; padding-top: 8px; display: inline-block; }
.remove-row-btn {
  background: #fde7e7; color: #b3261e; border: none; border-radius: 6px;
  width: 26px; height: 26px; cursor: pointer; font-weight: 700;
}
.grand-total-row { text-align: right; font-weight: 700; font-size: 14px; color: var(--green-700); }

.action-row { display: flex; flex-wrap: wrap; gap: 10px; padding-top: 4px; }
.btn-primary, .btn-secondary, .btn-ghost, .btn-small {
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
}
.btn-primary { background: var(--green-600); color: #fff; }
.btn-primary:hover { background: var(--green-700); }
.btn-secondary { background: var(--green-100); color: var(--green-700); border: 1px solid var(--green-600); }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-small { background: var(--green-100); color: var(--green-700); border: 1px solid var(--green-600); padding: 5px 10px; font-size: 12px; }
.status-line { font-size: 13px; color: var(--muted); min-height: 18px; }
.status-line.ok { color: var(--green-700); }
.status-line.err { color: #b3261e; }

/* ---------- Preview ---------- */
.preview-panel { display: flex; flex-direction: column; gap: 10px; width: 100%; }
.preview-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 8px 12px; box-shadow: var(--shadow);
}
.preview-toolbar-label { font-size: 12.5px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.preview-scroll { width: 100%; overflow: hidden; padding: 4px; }
.preview-scroll.full-size { overflow-x: auto; height: auto !important; display: flex; justify-content: center; }

.a4-sheet {
  width: 210mm;
  min-height: 297mm;
  background: #fff;
  padding: 16mm 14mm;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  color: #14251d;
  font-size: 13px;
  line-height: 1.55;
  flex-shrink: 0;
  transform-origin: top left;
}

.cert-header { display: flex; align-items: center; gap: 14px; }
.cert-logo { width: 78px; height: 78px; object-fit: contain; }
.cert-clinic-info h1 { margin: 0; font-size: 22px; color: var(--green-900); letter-spacing: .02em; }
.cert-clinic-info .tagline { margin: 2px 0; font-size: 11.5px; color: var(--green-700); font-style: italic; }
.cert-clinic-info .doctor-line { margin: 2px 0 0; font-size: 12.5px; font-weight: 600; }

.header-rule { border: none; border-top: 2px solid var(--green-600); margin: 10px 0 14px; }

.cert-title { text-align: center; margin-bottom: 10px; }
.cert-title h2 { margin: 0; font-size: 17px; letter-spacing: .08em; text-decoration: underline; text-underline-offset: 4px; }

.cert-meta { display: flex; justify-content: space-between; font-size: 12.5px; margin-bottom: 14px; flex-wrap: wrap; gap: 6px; }

.cert-body p { text-align: justify; margin: 0 0 14px; }

.med-table { width: 100%; border-collapse: collapse; margin: 10px 0 16px; font-size: 12px; }
.med-table th, .med-table td { border: 1px solid #b9c9c1; padding: 6px 8px; }
.med-table thead th { background: var(--green-100); color: var(--green-900); text-align: left; }
.med-table td.tright { text-align: right; }
.med-table tbody td:nth-child(1) { text-align: center; width: 24px; }
.med-table tbody td:nth-child(4), .med-table tbody td:nth-child(5), .med-table tbody td:nth-child(6) { text-align: right; }
.med-table tfoot td { font-weight: 700; background: #fbfdfc; }

.declaration { font-size: 11.5px; color: var(--muted); font-style: italic; }

.cert-footer { display: flex; justify-content: space-between; align-items: flex-end; margin-top: 40px; gap: 20px; }
.sign-block { text-align: center; min-width: 180px; }
.sign-block.left .sig-line { height: 60px; border-bottom: 1px solid #14251d; margin-bottom: 6px; display: flex; align-items: flex-end; justify-content: center; }
.sign-block.left .sig-line img { max-height: 55px; max-width: 100%; object-fit: contain; }
.sign-block.right .stamp-wrap { display: flex; align-items: flex-end; justify-content: center; gap: 10px; height: 90px; }
.sign-block.right .seal-img { width: 78px; height: 78px; object-fit: contain; }
.sign-block.right .sig-img { max-height: 68px; max-width: 140px; object-fit: contain; }
.sig-caption { margin: 2px 0; font-size: 12px; }
.sig-caption.doctor-name { font-weight: 700; border-top: 1px solid #14251d; padding-top: 4px; margin-top: 4px; }
.sig-caption.reg { color: var(--muted); font-size: 11px; }

/* ---------- Settings ---------- */
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; max-width: 1100px; }
.settings-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px; display: flex; flex-direction: column; gap: 8px;
}
.settings-card h3 { margin: 0 0 6px; color: var(--green-900); }
.settings-card .hint { font-size: 12px; color: var(--muted); margin: 0 0 8px; }
.upload-row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.upload-preview { width: 56px; height: 56px; object-fit: contain; border: 1px solid var(--border); border-radius: 6px; background: #fafafa; }
.settings-card button { margin-top: 6px; align-self: flex-start; }

/* ---------- History ---------- */
.history-wrap { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; max-width: 1100px; }
.history-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.history-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.history-table th, .history-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.history-table .empty-row { text-align: center; color: var(--muted); padding: 24px; }
.history-table .hist-btn { background: none; border: 1px solid var(--border); border-radius: 6px; padding: 4px 8px; cursor: pointer; font-size: 12px; margin-right: 6px; }

@media print {
  .topbar, .form-panel, .tabs { display: none !important; }
  .a4-sheet { box-shadow: none; border: none; margin: 0; }
}