feat: enhance search component with improved styling and functionality

Author: Ghassen-Lassoued

docs/_sass/custom/custom.scss

@@ -327,12 +327,32 @@ tr:hover {
 }
 
 // Search
+.search {
+  position: relative;
+  margin-bottom: 1rem;
+  padding: 0 1rem;
+}
+
+.search-input-wrap {
+  display: flex;
+  align-items: center;
+  position: relative;
+}
+
 .search-input {
   font-family: var(--font-body);
-  border-radius: 0.5rem;
-  border: 1px solid var(--color-border);
-  padding: 0.625rem 1rem;
+  width: 100%;
+  padding: 0.625rem 1rem 0.625rem 2.5rem;
   font-size: 0.9rem;
+  background-color: var(--color-bg);
+  border: 1px solid var(--color-border);
+  border-radius: 0.5rem;
+  color: var(--color-text);
+  transition: all 0.15s ease;
+
+  &::placeholder {
+    color: var(--color-text-muted);
+  }
 
   &:focus {
     border-color: var(--color-primary);
@@ -341,6 +361,92 @@ tr:hover {
   }
 }
 
+.search-label {
+  position: absolute;
+  left: 0.75rem;
+  top: 50%;
+  transform: translateY(-50%);
+  color: var(--color-text-muted);
+  pointer-events: none;
+
+  .search-icon {
+    width: 1rem;
+    height: 1rem;
+  }
+}
+
+.search-results {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+  margin-top: 0.5rem;
+  background-color: var(--color-bg);
+  border: 1px solid var(--color-border);
+  border-radius: 0.5rem;
+  box-shadow: var(--shadow-md);
+  max-height: 20rem;
+  overflow-y: auto;
+  z-index: 100;
+}
+
+.search-results-list {
+  list-style: none;
+  padding: 0.5rem;
+  margin: 0;
+}
+
+.search-results-list-item {
+  padding: 0.5rem 0.75rem;
+  border-radius: 0.375rem;
+  cursor: pointer;
+
+  &:hover,
+  &.active {
+    background-color: var(--color-bg-tertiary);
+  }
+}
+
+.search-result-title {
+  font-weight: 600;
+  color: var(--color-text);
+  font-size: 0.9rem;
+}
+
+.search-result-doc {
+  font-size: 0.8rem;
+  color: var(--color-text-secondary);
+  margin-top: 0.125rem;
+
+  .search-result-doc-title {
+    font-weight: 500;
+  }
+}
+
+.search-result-previews {
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+  margin-top: 0.25rem;
+}
+
+.search-result-preview + .search-result-preview {
+  margin-top: 0.125rem;
+}
+
+.search-result-highlight {
+  background-color: rgba(124, 58, 237, 0.15);
+  color: var(--color-primary-dark);
+  padding: 0.125em 0.25em;
+  border-radius: 0.25rem;
+}
+
+.search-no-result {
+  padding: 1rem;
+  text-align: center;
+  color: var(--color-text-muted);
+  font-size: 0.9rem;
+}
+
 // TOC
 .toc {
   background-color: var(--color-bg-secondary);