修改配色，修改功能

codes/minipro/calculation/miniprogram/pages/calculator/calculator.wxss

@@ -38,42 +38,55 @@ page {
   display: flex;
   justify-content: space-between;
   align-items: center;
+  z-index: 10;
 }
 
 .top-actions {
   display: flex;
-  gap: 16rpx;
+  gap: 20rpx;
 }
 
 .action-btn {
-  width: 64rpx;
-  height: 64rpx;
+  width: 72rpx;
+  height: 72rpx;
   display: flex;
   align-items: center;
   justify-content: center;
   border-radius: 50%;
-  background: rgba(17, 97, 107, 0.1); /* Color 01 with opacity */
+  background: #ffffff;
+  box-shadow: 0 4rpx 12rpx rgba(17, 97, 107, 0.15); /* Teal shadow */
 }
 
 .action-icon {
-  font-size: 30rpx;
+  font-size: 36rpx;
   color: #11616B; /* Color 01 */
 }
 
 /* 模式切换 */
+.mode-indicator {
+  display: flex;
+  background: #ffffff;
+  padding: 6rpx;
+  border-radius: 16rpx; /* Reduced radius */
+  box-shadow: 0 4rpx 12rpx rgba(17, 97, 107, 0.1);
+}
+
 .mode-indicator text {
-  color: #7BBDB6; /* Color 02 text */
-  font-size: 24rpx;
-  padding: 10rpx 24rpx;
-  border-radius: 30rpx;
-  background: rgba(123, 189, 182, 0.2); /* Color 02 bg */
+  color: #7BBDB6; /* Color 02 */
+  font-size: 26rpx;
+  padding: 10rpx 30rpx;
+  border-radius: 12rpx; /* Reduced radius */
+  background: transparent;
   border: none;
+  font-weight: 500;
+  transition: all 0.2s ease;
 }
 
 .mode-indicator text.active {
-  color: #11616B; /* Color 01 text */
-  background: rgba(17, 97, 107, 0.15); /* Color 01 bg */
+  color: #ffffff;
+  background: #11616B; /* Color 01 */
   font-weight: 600;
+  box-shadow: 0 2rpx 8rpx rgba(17, 97, 107, 0.2);
 }
 
 /* 表达式行 */
@@ -260,7 +273,7 @@ page {
   position: relative;
   z-index: 101;
   background: #EBF4F8; /* Color 03 */
-  border-radius: 0 0 36rpx 36rpx;
+  border-radius: 0 0 16rpx 16rpx; /* Reduced radius */
   max-height: 70vh;
   display: flex;
   flex-direction: column;
@@ -306,25 +319,25 @@ page {
 
 .history-item {
   padding: 28rpx 40rpx;
-  border-bottom: 1rpx solid rgba(255,255,255,0.05);
+  border-bottom: 1rpx solid rgba(17, 97, 107, 0.08); /* Darker border for light bg */
   display: flex;
   flex-direction: column;
   align-items: flex-end;
 }
 
 .history-item:active {
-  background: rgba(255,255,255,0.06);
+  background: rgba(17, 97, 107, 0.05); /* Dark interaction state */
 }
 
 .history-expr {
-  color: rgba(255,255,255,0.45);
+  color: rgba(17, 97, 107, 0.6); /* Color 01 faded - Visible on light bg */
   font-size: 26rpx;
   margin-bottom: 8rpx;
   font-family: -apple-system, 'SF Pro Display', monospace;
 }
 
 .history-result {
-  color: #ffffff;
+  color: #11616B; /* Color 01 - Visible High Contrast */
   font-size: 42rpx;
   font-weight: 500;
   font-family: -apple-system, 'SF Pro Display', 'Helvetica Neue', sans-serif;
@@ -344,6 +357,67 @@ page {
   opacity: 0.5;
 }
 
+/* Help Panel Styles */
+.help-list {
+  padding: 0; /* padding moved to inner section to avoid scroll-view width issues */
+}
+
+.help-section {
+  display: flex;
+  flex-direction: column;
+  gap: 40rpx;
+  padding: 30rpx 40rpx 60rpx; /* Apply padding here */
+  box-sizing: border-box;
+}
+
+.help-item {
+  display: flex;
+  gap: 24rpx;
+  align-items: flex-start;
+}
+
+.help-icon {
+  font-size: 44rpx;
+  width: 60rpx;
+  text-align: center;
+  padding-top: 4rpx;
+}
+
+.help-text {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+}
+
+.help-h1 {
+  font-size: 30rpx;
+  font-weight: bold;
+  color: #11616B; /* Color 01 */
+  margin-bottom: 12rpx;
+}
+
+.help-p {
+  font-size: 26rpx;
+  color: #2d3436;
+  line-height: 1.6;
+  opacity: 0.8;
+}
+
+.share-btn-large {
+  background-color: #11616B !important; /* Color 01 */
+  color: white !important;
+  border-radius: 16rpx !important; /* Unified radius */
+  font-size: 30rpx !important;
+  font-weight: 500 !important;
+  margin-top: 20rpx;
+  width: 100% !important;
+  box-shadow: 0 8rpx 20rpx rgba(17, 97, 107, 0.25);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 24rpx 0;
+}
+
 /* ========== 小屏适配 ========== */
 @media (max-width: 360px) {
   .btn {