style: update border-radius and padding values across components

- standardize border-radius from 8px to 6px for consistent styling
- adjust padding values from 1rem to 0.75rem for better visual hierarchy
- remove redundant overflow-y properties for cleaner code

docs/.vitepress/theme/components/appendix/ai-history/AttentionMechanismDemo.vue

@@ -140,7 +140,7 @@ const getInsight = (index) => {
   margin-bottom: 24px;
   padding: 16px;
   background-color: var(--vp-c-bg-alt);
-  border-radius: 8px;
+  border-radius: 6px;
 }
 
 .word-token {

docs/.vitepress/theme/components/appendix/ai-history/BackpropagationDemo.vue

@@ -234,7 +234,7 @@ onMounted(() => {
   display: flex;
   justify-content: center;
   background-color: var(--vp-c-bg-alt);
-  border-radius: 8px;
+  border-radius: 6px;
   padding: 10px;
 }
 

docs/.vitepress/theme/components/appendix/ai-history/CombinatorialExplosionDemo.vue

@@ -213,7 +213,7 @@ watch([featureCount, valuesPerFeature], () => {
   text-align: center;
   background-color: var(--vp-c-bg-alt);
   padding: 16px;
-  border-radius: 8px;
+  border-radius: 6px;
 }
 
 .formula-suffix {
@@ -234,7 +234,7 @@ watch([featureCount, valuesPerFeature], () => {
   width: 50px;
   height: 50px;
   border: 2px solid;
-  border-radius: 8px;
+  border-radius: 6px;
   display: flex;
   flex-direction: column;
   align-items: center;

docs/.vitepress/theme/components/appendix/ai-history/DiscriminativeVsGenerativeDemo.vue

@@ -208,7 +208,7 @@ const mode = ref('discriminative')
   gap: 10px;
   background-color: var(--vp-c-bg);
   padding: 16px;
-  border-radius: 8px;
+  border-radius: 6px;
 }
 
 .io-box {

docs/.vitepress/theme/components/appendix/ai-history/GPTEvolutionDemo.vue

@@ -149,7 +149,7 @@ const handleTabClick = (tab) => {
 }
 
 .main-card {
-  border-radius: 8px;
+  border-radius: 6px;
 }
 
 .card-header {

docs/.vitepress/theme/components/appendix/ai-history/NeuralNetworkVisualizationDemo.vue

@@ -334,7 +334,7 @@ const isConnectionFocus = (c) => {
   display: flex;
   justify-content: center;
   background-color: var(--vp-c-bg-alt);
-  border-radius: 8px;
+  border-radius: 6px;
   padding: 10px;
 }
 

docs/.vitepress/theme/components/appendix/ai-history/RuleBasedVsLearningDemo.vue

@@ -274,7 +274,7 @@ const train = () => {
 .result-box {
   background-color: var(--vp-c-bg-alt);
   padding: 12px;
-  border-radius: 8px;
+  border-radius: 6px;
   border: 1px solid var(--vp-c-divider);
   text-align: center;
 }