/**
 * Viewport Component Styles
 */

.viewport {
  flex: 1;
  position: relative;
  background-color: var(--color-bg-primary);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===========================
   Viewport Toolbar
   =========================== */

.viewport__toolbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  height: 40px;
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: 0 var(--spacing-md);
  z-index: 10;
}

.viewport__toolbar .toolbar__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.viewport__toolbar .toolbar__btn:hover:not(:disabled) {
  background-color: var(--color-bg-hover);
  border-color: var(--color-accent);
}

.viewport__toolbar .toolbar__btn:active:not(:disabled) {
  background-color: var(--color-accent);
  transform: scale(0.95);
}

.viewport__toolbar .toolbar__btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.viewport__toolbar .toolbar__btn svg {
  display: block;
}

/* ===========================
   Canvas
   =========================== */

.viewport__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  cursor: default;
}

.viewport__canvas.panning {
  cursor: grabbing;
}

.viewport__canvas.zoom-region {
  cursor: crosshair;
}

/* ===========================
   Placeholder State (Empty State)
   =========================== */

.viewport__placeholder {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-viewport-placeholder);
  pointer-events: none;
  z-index: 1;
}

.viewport__placeholder-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-lg);
  max-width: 420px;
  padding: var(--spacing-xl);
  background-color: #f8f8f8; /* Light document area */
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.viewport__placeholder svg {
  color: #666;
  opacity: 0.7;
}

.viewport__placeholder-title {
  margin: 0;
  font-size: 24px;
  font-weight: 500;
  color: #1a1a1a;
  text-align: center;
}

.viewport__placeholder-text {
  margin: 0;
  font-size: 15px;
  color: #666;
  text-align: center;
  line-height: 1.6;
}

/* Hide placeholder when canvas has content */
.viewport.has-document .viewport__placeholder {
  display: none;
}

/* ===========================
   Loading State
   =========================== */

.viewport__loading {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  background-color: rgba(26, 26, 26, 0.9);
  z-index: 2;
}

.viewport__loading p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

.viewport__spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-bg-tertiary);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===========================
   Error State
   =========================== */

.viewport__error {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  background-color: rgba(26, 26, 26, 0.95);
  z-index: 2;
}

.viewport__error svg {
  color: var(--color-error);
}

.viewport__error-message {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  margin: 0;
}

.viewport__error-retry {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-accent);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  transition: background-color var(--transition-fast);
}

.viewport__error-retry:hover {
  background-color: var(--color-accent-hover);
}

.viewport__error-retry:active {
  background-color: var(--color-accent-active);
}

/* ===========================
   Zoom Region Selection
   =========================== */

.viewport__zoom-selection {
  position: absolute;
  border: 2px solid var(--color-accent);
  background-color: rgba(74, 158, 255, 0.1);
  pointer-events: none;
  z-index: 1;
}

/* ===========================
   Context Menu Override
   =========================== */

.viewport {
  /* Suppress right-click context menu */
  -webkit-touch-callout: none;
}