fix(calc-02): adjust display button layout and enter key spacing

samples/calc-02/index.css

@@ -75,8 +75,7 @@ body {
 .display-buttons-panel,
 .keypad-panel,
 .functions-panel,
-.trigo-panel,
-.status-line {
+.trigo-panel {
 	border-radius: 8px;
 	border: 1px solid rgba(255, 255, 255, 0.06);
 	background: rgba(6, 10, 16, 0.16);
@@ -108,10 +107,6 @@ body {
 	margin-bottom: 0;
 }
 
-.display-frame {
-	margin: 0;
-	padding: 0;
-}
 
 .display-grid {
 	height: 100%;
@@ -169,14 +164,7 @@ body {
 	box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), 0 3px 0 rgba(0, 0, 0, 0.28);
 }
 
-.display-button-offset {
-	grid-column-start: 2;
-}
 
-.display-button-spacer {
-	opacity: 0;
-	pointer-events: none;
-}
 
 .mode-menu {
 	position: fixed;
@@ -303,18 +291,12 @@ button:hover {
 	filter: brightness(1.06);
 }
 
-.display-button:hover {
-	filter: brightness(1.08);
-}
 
 button:active {
 	transform: translateY(2px);
 	box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 1px 0 rgba(0, 0, 0, 0.25);
 }
 
-.display-button:active {
-	transform: translateY(2px);
-}
 
 .stack-copy-button {
 	padding: 4px;
@@ -376,11 +358,6 @@ button:active {
 	color: #eef2f7;
 }
 
-.key-alt {
-	background: linear-gradient(180deg, var(--btnAltTop), var(--btnAltBottom));
-	color: #eef2f7;
-}
-
 .key-danger {
 	background: linear-gradient(180deg, var(--btnDangerTop), var(--btnDangerBottom));
 	color: #eef2f7;
@@ -389,6 +366,14 @@ button:active {
 .key-enter {
 	background: linear-gradient(180deg, var(--btnEnterTop), var(--btnEnterBottom));
 	color: #eef2f7;
+	padding-inline: 6px;
+}
+
+@media (max-width: 700px) {
+	.key-enter {
+		padding-inline: 4px;
+		letter-spacing: 0.01em;
+	}
 }
 
 .hidden-input {