/* layout.css — アプリ全体の三段レイアウトと分割プレビュー */

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100dvh;
}

.app-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 16px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand__logo {
  font-size: 20px;
  color: var(--accent);
}

.brand__title {
  font-size: 15px;
  letter-spacing: 0.02em;
}

.brand__badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--success) 18%, transparent);
  color: var(--success);
  border: 1px solid color-mix(in srgb, var(--success) 35%, transparent);
}

.app-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: flex-end;
}

.spacer {
  flex: 1;
}

.app-main {
  display: grid;
  grid-template-columns: 320px 1fr;
  min-height: 0;
  overflow: hidden;
}

.panel--controls {
  border-right: 1px solid var(--border);
  background: var(--bg-elev);
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.preview {
  display: grid;
  grid-template-columns: 1fr 6px 1fr;
  min-height: 0;
}

.preview__pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.preview__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px 6px 12px;
  font-size: 12px;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--border);
  background: var(--bg-sunken);
  min-height: 38px;
}

.preview__viewport {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  background:
    repeating-conic-gradient(var(--bg-sunken) 0 25%, transparent 0 50%) 0 0 / 20px 20px;
  touch-action: none;
}

.viewport__content {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  will-change: transform;
}

.preview__divider {
  background: var(--border);
  cursor: col-resize;
  transition: background var(--transition-fast);
  touch-action: none;
}

.preview__divider:hover,
.preview__divider:active {
  background: var(--accent);
}

.preview__actions {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.brush-tools {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding-right: 6px;
  border-right: 1px solid var(--border);
  margin-right: 2px;
}

.brush-tools .brush-size {
  width: 70px;
  accent-color: var(--accent);
}

.preview__viewport[data-brush-tool='paint'] {
  cursor: crosshair;
}

.preview__viewport[data-brush-tool='erase'] {
  cursor: cell;
}

.app-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: var(--bg-elev);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--fg-muted);
}

@media (max-width: 880px) {
  .app-main {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }
  .panel--controls {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 40vh;
  }
  .preview {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 6px 1fr;
  }
  .preview__divider {
    cursor: row-resize;
  }
}