.line-page .pixel-controls h1 { font-size: clamp(1.9rem, 3vw, 2.65rem); }
.line-upload-actions { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 7px; }
.line-upload-actions .pixel-drop { min-height: 76px; }
.line-upload-actions .utility-btn { min-width: 94px; }
.line-sliders { display: grid; gap: 8px; }
.line-background { display: grid; gap: 5px; }
.line-background span { color: var(--muted); font: 800 .72rem/1.2 "Courier New", monospace; letter-spacing: .08em; text-transform: uppercase; }
.line-background select { min-height: 42px; }
.line-page .pixel-stage canvas { image-rendering: auto; background: white; }
.line-page .pixel-canvas-wrap.checker canvas { background-color: transparent; }
.line-limit-note { margin: 0; padding: 9px 10px; border-left: 3px solid var(--accent); background: #fff7de; color: var(--muted); font-size: .76rem; line-height: 1.4; }
@media (max-width: 560px) {
  .line-upload-actions { grid-template-columns: 1fr; }
  .line-upload-actions .utility-btn { min-height: 40px; }
}