Improve serach function with quick suggestions

assets/style.css

@@ -72,22 +72,36 @@ a:hover {
     color: var(--link-hover);
 }
 
-/* === Header === */
+/* === Header ===
+   Three-column grid (breadcrumbs left, search centre, actions right) using
+   named grid-areas so the centre stays reserved even when search is hidden
+   in editor mode. Mobile (≤1100px) collapses to a two-row layout — see the
+   responsive block at the bottom of this file. */
 header {
     padding: 0.75rem 1rem;
     border-bottom: 1px dashed var(--secondary);
-    display: flex;
+    display: grid;
+    grid-template-columns: 1fr minmax(0, auto) 1fr;
+    grid-template-areas: "crumbs search actions";
     align-items: center;
     gap: 0.5rem;
-    flex-wrap: wrap;
 }
 
 .breadcrumb {
+    grid-area: crumbs;
     display: flex;
     align-items: center;
     gap: 0.25rem;
+    min-width: 0;
+}
+
+.header-actions {
+    grid-area: actions;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    justify-content: flex-end;
     flex-wrap: wrap;
-    flex: 1;
 }
 
 .logo {
@@ -96,8 +110,14 @@ header {
     vertical-align: center;
 }
 
-.sep {
+.nav-up {
+    display: inline-flex;
+    align-items: center;
     color: var(--secondary);
+    padding: 0 0.25rem;
+}
+.nav-up:hover {
+    color: var(--primary-hover);
 }
 
 .btn {
@@ -429,8 +449,13 @@ textarea {
 
 /* === Search === */
 .search-form {
+    grid-area: search;
     display: flex;
     gap: 0.25rem;
+    position: relative;
+    justify-self: center;
+    width: 24rem;
+    max-width: 100%;
 }
 .search-input {
     background: var(--bg-panel);
@@ -440,13 +465,73 @@ textarea {
     font-size: 0.9rem;
     padding: 0.3rem 0.5rem;
     min-width: 0;
-    width: 12rem;
+    width: 100%;
     max-width: 100%;
     outline: none;
 }
 .search-input:focus {
     border-color: var(--primary-hover);
 }
+
+/* === Suggestion dropdown (header + editor link picker) ===
+   Anchored to a position:relative host (search-form, or the modal body
+   for the link picker). Visuals mirror .dropdown-menu — dashed border,
+   bg-panel-hover for the active row. */
+.suggest-host {
+    position: relative;
+}
+.suggest-dropdown {
+    position: absolute;
+    top: 100%;
+    left: 0;
+    right: 0;
+    z-index: 200;
+    background: var(--bg-panel);
+    border: 1px dashed var(--secondary);
+    border-top: none;
+    display: none;
+}
+.suggest-dropdown.is-open {
+    display: block;
+}
+.suggest-row {
+    display: flex;
+    flex-direction: column;
+    gap: 0.1rem;
+    padding: 0.4rem 0.6rem;
+    cursor: pointer;
+    border: none;
+    background: none;
+    color: inherit;
+    font: inherit;
+    text-align: left;
+    width: 100%;
+}
+.suggest-row + .suggest-row {
+    border-top: 1px solid var(--secondary);
+}
+.suggest-row:hover,
+.suggest-row.is-active {
+    background: var(--bg-panel-hover);
+}
+.suggest-row.is-empty {
+    color: var(--text-muted);
+    cursor: default;
+}
+.suggest-row.is-empty:hover {
+    background: none;
+}
+.suggest-name {
+    color: var(--text);
+}
+.suggest-path {
+    color: var(--text-muted);
+    font-size: 0.8rem;
+}
+.suggest-footer {
+    color: var(--link);
+    font-size: 0.85rem;
+}
 .search-card {
     display: flex;
     flex-direction: column;
@@ -880,6 +965,16 @@ aside.sidebar:empty {
     .page-wrap {
         grid-template-columns: 1fr;
     }
+    /* Single-row mobile header: logo + Up icon are compact so search
+       can take the middle flex column, with actions on the right. */
+    header {
+        grid-template-columns: auto 1fr auto;
+    }
+    .search-form {
+        width: 100%;
+        max-width: none;
+        justify-self: stretch;
+    }
     /* Sidebar on mobile is a floating overlay toggled by the FAB. The aside
        itself is the scroll container; its children render at natural height. */
     .sidebar {