PCB ReTrace initial

docs/common.css

@@ -0,0 +1,43 @@
+:root {
+	--border: #cbd5e1;
+	--text-muted: #94a3b8;
+	--bg-default: #f1f5f9;
+	--text-default: #1e293b;
+}
+
+body {
+	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
+	margin: 0;
+	padding: 0;
+
+	/* MOBILE VIEWPORT FIX */
+	height: 100vh;		/* Fallback */
+	height: 100dvh;		/* Dynamic height handles mobile toolbars */
+
+	display: flex;
+	flex-direction: column;
+	overflow: hidden; /* Prevent body scroll, let containers scroll */
+}
+
+/* COMPACT FOOTER */
+.app-footer {
+	padding: 0.2rem 0;
+	text-align: center;
+	font-size: 0.65rem;
+	color: var(--text-muted);
+	border-top: 1px solid var(--border);
+	background: rgba(255, 255, 255, 0.9); /* Slight transparency */
+	flex-shrink: 0;
+	z-index: 20;
+	width: 100%;
+}
+
+.app-footer a {
+	color: inherit;
+	text-decoration: none;
+	border-bottom: 1px dotted var(--border);
+}
+
+@keyframes spin {
+	100% { -webkit-transform: rotate(360deg); transform:rotate(360deg); }
+}