/**
 * viewer.css
 * Infinite canvas viewport and workstation tools.
 */

.viewer-panel {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  position: relative;
  height: 100%;
  overflow: hidden;
}

.viewer-toolbar {
  height: 48px;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
  z-index: 10;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.canvas-hint {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.canvas-hint kbd {
  background: var(--badge);
  border: 1px solid var(--rule);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.64rem;
}

.view-bg-options {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bg-toggle {
  width: 18px;
  height: 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--rule);
  cursor: pointer;
  transition: transform 0.15s ease;
}

.bg-toggle:hover { transform: scale(1.12); }
.bg-toggle[data-bg="nobg"] {
  background: conic-gradient(#dcdbd5 90deg, #ffffff 90deg 180deg, #dcdbd5 180deg 270deg, #ffffff 270deg);
  background-size: 8px 8px;
}
.bg-toggle[data-bg="paper"] { background: #f5f4ef; }
.bg-toggle[data-bg="ink"] { background: #0e0d0a; }

html[data-theme="dark"] .bg-toggle[data-bg="nobg"] {
  background: conic-gradient(#2a2924 90deg, #12110e 90deg 180deg, #2a2924 180deg 270deg, #12110e 270deg);
  background-size: 8px 8px;
}

.bg-toggle.active {
  border-color: var(--ink);
  box-shadow: 0 0 0 1.5px var(--ink);
}

.canvas-viewport {
  flex: 1;
  position: relative;
  overflow: hidden !important;
  user-select: none;
  overscroll-behavior: none;
  touch-action: none;
}

.editor-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-empty {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  max-width: 360px;
  pointer-events: none;
  z-index: 5;
}

.empty-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--tertiary);
}

.empty-icon svg { width: 40px; height: 40px; display: block; }

.canvas-empty h3 {
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.025em;
  margin-bottom: 8px;
  color: var(--ink);
}

.canvas-empty h3 em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
}

.canvas-empty p {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.6;
}

.viewer-footer {
  height: 52px;
  border-top: 1px solid var(--rule);
  background: var(--card);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
  z-index: 10;
}

.stats-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.stat-pill {
  padding: 4px 11px;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  background: var(--badge);
  border-radius: var(--radius-pill);
  color: var(--muted);
}

.stat-pill.accent {
  color: var(--ink);
  font-weight: 700;
}

.stat-btn {
  background: transparent;
  border: 1px solid var(--rule);
  cursor: pointer;
  transition: all 0.2s ease;
}

.stat-btn:hover {
  background: var(--ink);
  color: var(--paper);
}

/* Floating Recenter Button */
.recenter-pill-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.16);
  cursor: pointer;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              background 0.15s ease,
              box-shadow 0.15s ease;
  user-select: none;
}

.recenter-pill-btn svg {
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.recenter-pill-btn:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.26);
  transform: translateY(-1px);
}

.recenter-pill-btn:hover svg {
  transform: rotate(90deg);
}

.recenter-pill-btn:active {
  transform: translateY(1px);
}

.recenter-pill-btn.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
}