*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #ef4444;
  --bg: #f1f5f9;
  --surface: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.12);
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
}

/* ── Toolbar ── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  flex-shrink: 0;
  flex-wrap: wrap;
  z-index: 10;
}

.file-name {
  flex: 1;
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.toolbar-right {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

/* ── Buttons ── */
button {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  padding: 7px 13px;
  transition: background 0.12s, opacity 0.12s;
  white-space: nowrap;
}

button:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) { background: var(--bg); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 6px;
}
.btn-ghost:hover:not(:disabled) { background: var(--bg); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: #dc2626; }

.btn-icon { background: var(--primary); color: #fff; }
.btn-icon:hover:not(:disabled) { background: var(--primary-dark); }

/* ── Error banner ── */
.error-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: #fef2f2;
  border-left: 4px solid var(--danger);
  color: #991b1b;
  font-size: 13px;
  flex-shrink: 0;
  z-index: 10;
}

.error-banner.warning {
  background: #fffbeb;
  border-left-color: #f59e0b;
  color: #92400e;
}

.error-banner-close {
  background: transparent;
  border: none;
  font-size: 18px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  color: inherit;
  flex-shrink: 0;
  font-weight: bold;
}

/* ── Main ── */
#main {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  height: 100%;
  min-height: 300px;
  padding: 32px;
  text-align: center;
  color: var(--text-muted);
  border: 2px dashed var(--border);
  margin: 24px;
  border-radius: 16px;
  transition: background 0.15s, border-color 0.15s;
}

.drop-zone.drag-over {
  background: #eff6ff;
  border-color: var(--primary);
}

.drop-zone h2 { font-size: 20px; color: var(--text); }
.drop-zone p { font-size: 14px; }

.hidden { display: none !important; }

/* ── PDF pages ── */
.pdf-pages {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 20px 16px;
}

.page-wrapper {
  position: relative;
  background: white;
  box-shadow: var(--shadow);
  border-radius: 4px;
  line-height: 0;
}

.page-wrapper canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-render-error {
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  font-size: 13px;
  color: #991b1b;
  background: #fef2f2;
  border: 1px solid #fecaca;
}

/* ── Free-text overlay ── */
.free-text-overlay {
  position: absolute;
  background: transparent;
  border: none;
  border-bottom: 1px dashed rgba(37,99,235,0.5);
  font-size: 14px;
  font-family: inherit;
  color: #000;
  outline: none;
  min-width: 80px;
  padding: 0 2px;
  z-index: 15;
  cursor: text;
}

.free-text-overlay:not(:focus) {
  cursor: move;
}

/* ── Form field overlays ── */
.form-field-overlay {
  position: absolute;
  background: rgba(255, 255, 150, 0.35);
  border: 1px solid rgba(0,0,0,0.2);
  font-family: inherit;
  font-size: 12px;
  padding: 1px 3px;
  outline: none;
  color: #000;
}

.form-field-overlay:focus {
  background: rgba(255, 255, 150, 0.65);
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(37,99,235,0.25);
  z-index: 5;
}

textarea.form-field-overlay { resize: none; }

/* ── Signature overlay on PDF ── */
.sig-overlay {
  position: absolute;
  cursor: move;
  border: 2px dashed var(--primary);
  border-radius: 2px;
  z-index: 20;
  user-select: none;
  touch-action: none;
}

.sig-overlay.confirmed {
  border: none;
  cursor: default;
}

.sig-overlay img {
  display: block;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.sig-overlay-controls {
  position: absolute;
  top: -30px;
  left: 0;
  display: flex;
  gap: 4px;
}

.sig-overlay-btn {
  padding: 3px 7px;
  font-size: 11px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  font-weight: 600;
}

/* Resize handle */
.sig-resize-handle {
  position: absolute;
  bottom: -5px;
  right: -5px;
  width: 14px;
  height: 14px;
  background: var(--primary);
  border-radius: 50%;
  cursor: se-resize;
  z-index: 21;
  touch-action: none;
}

/* Placement mode indicator */
.placement-mode-banner {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #1e293b;
  color: #fff;
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 500;
  z-index: 50;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  gap: 10px;
}

.placement-mode-banner button {
  background: #ef4444;
  color: #fff;
  padding: 4px 10px;
  font-size: 12px;
}

/* ── Modal ── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

@media (min-width: 600px) {
  .modal { align-items: center; }
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
}

.modal-content {
  position: relative;
  z-index: 1;
  background: var(--surface);
  border-radius: 16px 16px 0 0;
  padding: 20px 20px 32px;
  width: 100%;
  max-width: 680px;
  max-height: 92dvh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  box-shadow: 0 -4px 24px rgba(0,0,0,0.15);
}

@media (min-width: 600px) {
  .modal-content {
    border-radius: 16px;
    box-shadow: 0 8px 40px rgba(0,0,0,0.2);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.modal-header h2 { font-size: 18px; }

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.sig-import-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  flex-wrap: wrap;
}

.label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* ── Signature toolbar ── */
.sig-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.sig-toolbar input[type="range"] {
  flex: 1;
  min-width: 80px;
  accent-color: var(--primary);
  cursor: pointer;
}

.sig-toolbar #sig-linewidth-val {
  font-size: 12px;
  color: var(--text-muted);
  width: 28px;
  text-align: right;
}

.sig-toolbar input[type="color"] {
  width: 32px;
  height: 28px;
  padding: 1px;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  background: none;
}

.color-presets {
  display: flex;
  gap: 5px;
}

.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  padding: 0;
  cursor: pointer;
  transition: border-color 0.12s, transform 0.1s;
}

.color-swatch:hover  { transform: scale(1.15); }
.color-swatch.active { border-color: var(--primary); }

/* ── File input hidden — display:none works with <label for> on all platforms ── */
.file-input-hidden {
  display: none;
}

/* Labels styled as buttons */
.btn-label {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

/* ── Signature canvas ── */
.sig-canvas-wrapper {
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  touch-action: none;
}

#sig-canvas {
  display: block;
  width: 100%;
  cursor: crosshair;
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 39px,
      #e2e8f0 39px,
      #e2e8f0 40px
    );
  touch-action: none;
}

/* ── Saved signatures ── */
.saved-sigs-section { margin-top: 20px; }

.saved-sigs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sig-item {
  position: relative;
  padding: 8px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  background: #f8fafc;
  transition: border-color 0.12s;
  display: flex;
  align-items: center;
}

.sig-item:hover { border-color: #94a3b8; }
.sig-item.selected { border-color: var(--primary); background: #eff6ff; }

.sig-item img {
  max-height: 56px;
  max-width: 180px;
  display: block;
}

.sig-item-del {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 22px;
  height: 22px;
  padding: 0;
  border-radius: 50%;
  background: var(--danger);
  color: white;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid white;
}

.no-sigs {
  color: var(--text-muted);
  font-size: 13px;
  padding: 8px 0;
}

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #1e293b;
  color: #fff;
  padding: 10px 18px;
  border-radius: 24px;
  font-size: 13px;
  z-index: 200;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .toolbar { padding: 6px 8px; }
  .toolbar-right { gap: 4px; }
  button { padding: 6px 10px; font-size: 12px; }
  .pdf-pages { padding: 12px 8px; gap: 12px; }
}