:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #111111;
  --danger: #b91c1c;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Noto Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.app-header, .app-footer {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}
.app-footer { border-top: 1px solid var(--border); border-bottom: none; color: var(--muted); }

.app-header h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 16px;
}

.panel {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}

.panel h2 {
  margin: 0 0 12px 0;
  font-size: 18px;
}

.uploader {
  display: grid;
  gap: 12px;
}

#fileInput { display: none; }

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--fg);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  transition: transform .04s ease, background .2s ease, border-color .2s ease;
  touch-action: manipulation;
}
.btn:hover { background: #f9fafb; }
.btn:active { transform: scale(0.98); }
.btn.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn.danger {
  border-color: var(--danger);
  color: var(--danger);
}

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

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 18px;
  text-align: center;
  color: var(--muted);
  min-height: 70px;
}
.drop-zone.dragover {
  border-color: var(--accent);
  color: var(--fg);
  background: #fafafa;
}

.thumb-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
@media (min-width: 640px) {
  .thumb-grid { grid-template-columns: repeat(4, 1fr); }
}
.thumb {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: #f8f8f8;
  display: grid;
  grid-template-rows: auto 80px;
}
.thumb-media {
  aspect-ratio: 1 / 1;
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.thumb img {
  max-width: 100%;
  max-height: 100%;
  object-fit: cover;
  display: block;
}
.thumb .remove {
  position: absolute;
  top: 6px;
  right: 6px;
  background: rgba(17,17,17,0.85);
  color: #fff;
  border: none;
  border-radius: 999px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  cursor: pointer;
  font-weight: 700;
}

.thumb-ocr {
  position: absolute;
  bottom: 6px;
  left: 6px;
  background: rgba(17,17,17,0.8);
  color: #fff;
  font-size: 11px;
  padding: 4px 6px;
  border-radius: 6px;
}

.thumb-desc {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  resize: vertical;
  min-height: 64px;
  font-size: 14px;
  outline: none;
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 640px) {
  .options-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.field {
  display: grid;
  gap: 6px;
}
.field.row {
  grid-auto-flow: column;
  align-items: center;
  justify-content: start;
  gap: 16px;
}
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 16px;
  background: #fff;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  user-select: none;
}

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

.preview-wrap {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  height: 60vh;
  min-height: 320px;
}
#pdfPreview {
  width: 100%;
  height: 100%;
  border: 0;
}

.layout-preview {
  width: 100%;
  height: auto;
  display: block;
  background: #fff;
  border: 1px dashed var(--border);
  border-radius: 10px;
}