feat: add collapsible map controls

styles.css

@@ -1,7 +1,7 @@
 :root {
   color-scheme: light;
   --bg: #f3efe3;
-  --panel: rgba(253, 249, 240, 0.92);
+  --panel: rgba(253, 249, 240, 0.75);
   --panel-border: rgba(92, 73, 49, 0.18);
   --ink: #1f2a2e;
   --muted: #5f6b6f;
@@ -30,10 +30,8 @@ body {
 }
 
 .app-shell {
-  display: grid;
-  grid-template-columns: minmax(320px, 380px) 1fr;
+  position: relative;
   min-height: 100vh;
-  gap: 24px;
   padding: 24px;
 }
 
@@ -43,9 +41,70 @@ body {
 }
 
 .sidebar {
+  position: fixed;
+  z-index: 10;
+  top: 24px;
+  bottom: 24px;
+  left: 24px;
+  width: min(266px, calc(100vw - 48px));
   display: flex;
   flex-direction: column;
   gap: 16px;
+  overflow-y: auto;
+  padding: 8px;
+  transition: transform 240ms ease;
+  backdrop-filter: blur(3px);
+}
+
+.sidebar-toggle {
+  position: fixed;
+  z-index: 11;
+  display: grid;
+  width: 42px;
+  height: 42px;
+  padding: 0;
+  place-items: center;
+  border: 1px solid var(--panel-border);
+  border-radius: 14px;
+  background: var(--panel);
+  color: var(--ink);
+  font-size: 1.65rem;
+  font-weight: 500;
+  line-height: 1;
+  box-shadow: var(--shadow);
+}
+
+.sidebar-toggle:hover {
+  transform: translateY(-1px);
+}
+
+.sidebar-open {
+  top: 32px;
+  left: 32px;
+  opacity: 0;
+  visibility: hidden;
+  pointer-events: none;
+  transition: opacity 180ms ease;
+}
+
+.sidebar-close {
+  position: absolute;
+  top: 18px;
+  right: 18px;
+}
+
+.sidebar-close span[aria-hidden="true"] {
+  transform: translateY(-1px);
+}
+
+.app-shell.sidebar-is-collapsed .sidebar {
+  transform: translateX(calc(-100% - 24px));
+}
+
+.app-shell.sidebar-is-collapsed .sidebar-open {
+  opacity: 1;
+  visibility: visible;
+  pointer-events: auto;
 }
 
 .brand,
@@ -61,6 +120,32 @@ body {
   padding: 24px;
 }
 
+.brand-logo {
+  display: block;
+  width: min(100%, 178px);
+  height: auto;
+}
+
+.brand-subtitle {
+  margin-top: 8px;
+  color: var(--muted);
+  font-size: 1rem;
+  font-weight: 700;
+  letter-spacing: 0.04em;
+}
+
+.visually-hidden {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
 h1,
 h2,
 p {
@@ -210,11 +295,12 @@ button:disabled {
 }
 
 .map-wrap {
-  position: relative;
+  position: fixed;
+  z-index: 0;
+  inset: 24px;
   overflow: hidden;
   border-radius: 32px;
   box-shadow: var(--shadow);
-  min-height: 70vh;
 }
 
 #map {
@@ -222,12 +308,40 @@ button:disabled {
   inset: 0;
 }
 
+.map-wrap .ol-zoom {
+  top: 16px;
+  right: 16px;
+  left: auto;
+}
+
 @media (max-width: 920px) {
   .app-shell {
-    grid-template-columns: 1fr;
+    padding: 16px;
   }
 
   .map-wrap {
-    min-height: 62vh;
+    inset: 16px;
+    border-radius: 24px;
+  }
+
+  .map-wrap .ol-zoom {
+    top: 12px;
+    right: 12px;
+  }
+
+  .sidebar {
+    top: 16px;
+    bottom: 16px;
+    left: 16px;
+    width: min(266px, calc(100vw - 32px));
+  }
+
+  .sidebar-open {
+    top: 24px;
+    left: 24px;
+  }
+
+  .app-shell.sidebar-is-collapsed .sidebar {
+    transform: translateX(calc(-100% - 16px));
   }
 }