Migrate to app router (#2254)

components/Header/Header.module.css

@@ -0,0 +1,82 @@
+.header {
+  width: 100%;
+  height: 4.5em;
+  padding: 0.7em 1.5em;
+  border-bottom: 1px solid var(--colors-kindaLight);
+  background-color: var(--colors-backgroundHeader);
+  transition:
+    background var(--transitions-fade),
+    border var(--transitions-fade);
+  z-index: 9999px;
+
+  /* blurry glass-like background effect (except on firefox...?) */
+  backdrop-filter: saturate(180%) blur(5px);
+}
+
+.selfieImage {
+  width: 50px;
+  height: 50px;
+  border: 1px solid var(--colors-light);
+  border-radius: 50%;
+}
+
+.selfieLink {
+  display: inline-flex;
+  flex-shrink: 0;
+  align-items: center;
+  color: var(--colors-mediumDark) !important;
+}
+
+.selfieLink:hover,
+.selfieLink:focus-visible {
+  color: var(--colors-link) !important;
+}
+
+.name {
+  margin: 0 0.6em;
+  font-size: 1.15em;
+  font-weight: 500;
+  letter-spacing: 0.02em;
+  line-height: 1;
+}
+
+.nav {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  width: 100%;
+  max-width: var(--sizes-maxLayoutWidth);
+  margin: 0 auto;
+}
+
+@media (max-width: 768px) {
+  .header {
+    padding: 0.75em 1.25em;
+    height: 5.9em;
+  }
+
+  .selfieImage {
+    width: 70px;
+    height: 70px;
+    border-width: 2px;
+  }
+
+  .selfieLink:hover .selfieImage,
+  .selfieLink:focus-visible .selfieImage {
+    border-color: var(--colors-linkUnderline);
+  }
+
+  .name {
+    display: none;
+  }
+
+  .menu {
+    max-width: 325px;
+  }
+}
+
+@media (max-width: 380px) {
+  .menu {
+    max-width: 225px;
+  }
+}