.color-background-tool * { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
}
.color-background-tool .tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--icatdev-color-surface);
  border-bottom: 1px solid var(--icatdev-color-border);
  padding: 1rem 1.5rem;
}
.color-background-tool .tool-header h1 { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.025em; }

.color-background-tool .header-controls {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
}

.color-background-tool .header-controls .group {
  margin-bottom: 0;
}

.color-background-tool .header-controls label {
  white-space: nowrap;
}

/* Ghi đè cho input file nhỏ hơn */
.color-background-tool .header-controls input[type="file"] {
  padding: 0.5rem;
}

.color-background-tool .color-selector-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.color-background-tool .color-selector-wrapper #id-color {
  width: 200px; /* Giới hạn chiều rộng của dropdown */
}
.color-background-tool .color-selector-wrapper .palette-preview {
  width: 100px; /* Đặt chiều rộng cố định cho ô xem trước */
  margin-top: 0; /* Bỏ margin-top khi ở trên header */
}

.color-background-tool .main-container {
  display: flex;
  overflow: hidden;
  /* Xóa height để nó tự động co giãn theo nội dung */
  gap: 25px; /* Thêm khoảng cách giữa sidebar và preview */
}

.color-background-tool .sidebar {
  width: 340px;
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  overflow-y: auto;
}

.color-background-tool .group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.color-background-tool .group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--icatdev-color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.color-background-tool select, .color-background-tool button, .color-background-tool input[type="file"], .color-background-tool .color-palette-grid {
  width: 100%;
  padding: 0.625rem;
  background: var(--icatdev-color-bg);
  border: 1px solid var(--icatdev-color-border);
  color: var(--icatdev-color-text);
  border-radius: 6px;
  font-size: 0.9rem;
  outline: none;
}
.color-background-tool select:focus, .color-background-tool button:focus, .color-background-tool .color-palette-grid:focus-within { border-color: var(--icatdev-color-text); }

.color-background-tool .checkbox-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  background: #2b2d35;
  padding: 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--icatdev-color-border);
  max-height: 220px;
  overflow-y: auto;
}
.color-background-tool .checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;/* Giảm kích thước font */
  cursor: pointer;
  /* Sử dụng font hệ thống để hiển thị tiếng Việt tốt hơn ở size nhỏ */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; 
}
.color-background-tool .checkbox-item input {
  width: auto;
  cursor: pointer;
}

.color-background-tool .palette-preview {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  height: 32px;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--icatdev-color-border);
  margin-top: 0.25rem;
}
.color-background-tool .color-swatch {
  height: 100%;
}
.color-background-tool .btn-primary {
  background: var(--icatdev-color-text);
  color: var(--icatdev-color-bg);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: opacity 0.15s;
}
.color-background-tool .btn-primary:hover { opacity: 0.85; }

.color-background-tool .btn-secondary {
  background: var(--icatdev-color-border);
  color: #fff;
  cursor: pointer;
  border: none;
}
.color-background-tool .btn-secondary:hover { background: #4b5563; }

.color-background-tool .preview-area {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem;
  background: var(--icatdev-color-bg);
  overflow: auto;
}

.color-background-tool .canvas-wrapper {
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--icatdev-color-border);
  line-height: 0;
  max-width: 100%;
  max-height: 100%;
  background-image: linear-gradient(45deg, #18181b 25%, transparent 25%), 
                    linear-gradient(-45deg, #18181b 25%, transparent 25%), 
                    linear-gradient(45deg, transparent 75%, #18181b 75%), 
                    linear-gradient(-45deg, transparent 75%, #18181b 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.color-background-tool canvas {
  display: block;
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
}

@media (max-width: 992px) {
    .color-background-tool .main-container {
        flex-direction: column;
    }
}