/* =========================================================
   Block 4 - Preview Layout (CLIENT-ONLY)
   BƯỚC 2.4: Chỉ layout/trưng bày:
   - khung preview-area
   - sheet header
   - grid 3 cột
   Không chứa CSS in ấn cốt lõi (base.css)
   ========================================================= */

/* Khối preview (container ngoài) */
.block--preview {
  background: #f9fafb;
  border-radius: 16px;
  padding: 16px 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.block--preview .block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0;
}

/* Vùng preview */
#preview-area,
.preview-area {
  position: relative;
  width: 100%;
  min-height: 460px;
  border-radius: 16px;
  border: 1px dashed #d0d7e2;
  background: #fdfdfd;
  padding: 16px;
  box-sizing: border-box;
  overflow: auto;
}

/* Canvas wrapper */
.preview-canvas {
  position: relative;
  width: 100%;
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Placeholder / Error */
.preview-placeholder,
.preview-error {
  padding: 16px 20px;
  border-radius: 10px;
  font-size: 14px;
  color: #6b7280;
  background: #f3f4f6;
  text-align: center;
  max-width: 520px;
}

.preview-error {
  color: #b91c1c;
  background: #fef2f2;
}

/* Sheet (khung giấy hiển thị nhiều label để xem) */
.preview-sheet {
  position: relative;
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 0 0 1px #e5e7eb;
  padding: 20px 26px 26px;
  box-sizing: border-box;
  max-width: 1100px;
  width: 100%;
}

/* Header: tên bộ hình + mã đơn */
.preview-sheet-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 14px;
  font-weight: 600;
  color: #111827;
}

.preview-sheet-title {
  font-weight: 700;
}

.preview-sheet-sub {
  font-size: 13px;
  color: #6b7280;
}

/* Grid 3 cột */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px 24px;
}

/* Label wrapper trong grid (để tương thích base.css) */
.preview-grid .label-item {
  width: 100%;
}

/* Thanh nút */
.preview-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 6px;
}

/* Wrapper preview (có thể có viền xanh) */
.preview-grid-item {
  position: relative;
  display: inline-block; /* hoặc flex item tuỳ grid */
}

/* Viền xanh chỉ áp cho wrapper */
.preview-grid-item {
  outline: 1px dashed rgba(0, 140, 255, 0.35);
  outline-offset: -1px;
}

/* PRINT LAYER - tuyệt đối không có border/outline */
.label-item {
  position: relative;
  display: inline-block;
  border: none !important;
  outline: none !important;
  box-shadow: none !important;
}

/* Ảnh nền */
.label-bg {
  display: block;
  width: 100%;
  height: auto;
}

/* Textbox in */
.label-textbox {
  position: absolute;
}

/* Debug layer (khung đỏ) - đặt trên cùng nhưng KHÔNG nằm trong .label-item */
.preview-debug-layer {
  position: absolute;
  pointer-events: none;
  border: 2px dashed rgba(255, 0, 0, 0.45);
  box-sizing: border-box;
  z-index: 5;
}