add CSS for UI shell

- add CSS for all UI elements outside of article content
- add additional CSS classes to be activated by JavaScript
- add Roboto and Roboto Mono font packages as dev dependencies
- change navigation button in toolbar to a toggle

1 files changed, 273 insertions, 0 deletions

diff --git a/src/css/header.css b/src/css/header.css
new file mode 100644
index 0000000..65ce47c
--- /dev/null
+++ b/src/css/header.css
@@ -0,0 +1,273 @@
+:root {
+  --navbar-height: 3.25rem;
+}
+
+html.is-clipped--navbar {
+  overflow-y: hidden;
+}
+
+body {
+  padding-top: var(--navbar-height);
+}
+
+.navbar {
+  background-color: var(--color-navbar-bg);
+  color: var(--color-navbar-text);
+  font-size: 0.83333rem;
+  height: var(--navbar-height);
+  position: fixed;
+  top: 0;
+  width: 100%;
+  word-wrap: break-word;
+  z-index: 3;
+}
+
+.navbar a {
+  text-decoration: none;
+}
+
+.navbar-brand .navbar-item {
+  color: var(--color-navbar-text);
+  font-size: 1.15rem;
+}
+
+@media screen and (min-width: 1024px) {
+  .navbar-end > .navbar-item,
+  .navbar-end .navbar-link {
+    color: var(--color-navbar-text);
+  }
+
+  .navbar-end > a.navbar-item:hover,
+  .navbar-end .navbar-link:hover {
+    background-color: var(--color-navbar-bg-focus);
+    color: var(--color-navbar-text);
+  }
+
+  .navbar-end .navbar-link::after {
+    border-color: var(--color-navbar-text);
+  }
+
+  .navbar-item.has-dropdown:hover .navbar-link {
+    background-color: var(--color-navbar-bg-focus);
+    color: var(--color-navbar-text);
+  }
+}
+
+.navbar-brand {
+  align-items: stretch;
+  display: flex;
+  flex-shrink: 0;
+  height: var(--navbar-height);
+}
+
+.navbar-burger {
+  color: var(--color-navbar-text);
+  background: none;
+  border: none;
+  outline: none;
+  cursor: pointer;
+  display: block;
+  height: var(--navbar-height);
+  position: relative;
+  /* width: var(--navbar-height); */
+  width: 2.75rem;
+  margin-left: auto;
+  padding: 0;
+}
+
+.navbar-burger::-moz-focus-inner {
+  border: none;
+}
+
+.navbar-burger span {
+  background-color: currentColor;
+  display: block;
+  height: 1px;
+  left: 50%;
+  margin-left: -7px;
+  position: absolute;
+  top: 50%;
+  width: 15px;
+}
+
+.navbar-burger span:nth-child(1) {
+  margin-top: -6px;
+}
+
+.navbar-burger span:nth-child(2) {
+  margin-top: -1px;
+}
+
+.navbar-burger span:nth-child(3) {
+  margin-top: 4px;
+}
+
+.navbar-burger:hover {
+  background-color: var(--color-navbar-bg-focus);
+}
+
+.navbar-burger.is-active span:nth-child(1) {
+  margin-left: -5px;
+  transform: rotate(45deg);
+  transform-origin: left top;
+}
+
+.navbar-burger.is-active span:nth-child(2) {
+  opacity: 0;
+}
+
+.navbar-burger.is-active span:nth-child(3) {
+  margin-left: -5px;
+  transform: rotate(-45deg);
+  transform-origin: left bottom;
+}
+
+.navbar-menu {
+  display: none;
+}
+
+.navbar-item,
+.navbar-link {
+  color: var(--color-text);
+  display: block;
+  line-height: 1.5;
+  padding: 0.5rem 1rem;
+  position: relative;
+}
+
+.navbar-item {
+  flex: none;
+}
+
+.navbar-item.has-dropdown {
+  padding: 0;
+}
+
+.navbar-link {
+  padding-right: 2.5em;
+}
+
+.navbar-dropdown {
+  font-size: 0.875rem;
+}
+
+.navbar-dropdown .navbar-item {
+  padding-left: 1.5rem;
+  padding-right: 1.5rem;
+}
+
+@media screen and (max-width: 1023px) {
+  .navbar-brand .navbar-item {
+    align-items: center;
+    display: flex;
+  }
+
+  .navbar-menu {
+    background-color: #fff;
+    padding: 0.5rem 0;
+  }
+
+  .navbar-menu.is-active {
+    display: block;
+    box-shadow: 0 8px 16px rgba(10, 10, 10, 0.1);
+    max-height: calc(100vh - var(--navbar-height));
+    overflow-y: auto;
+  }
+
+  .navbar-menu a.navbar-item:hover,
+  .navbar-menu .navbar-link:hover {
+    background-color: #fafafa;
+  }
+}
+
+@media screen and (min-width: 1024px) {
+  .navbar,
+  .navbar-menu,
+  .navbar-end {
+    align-items: stretch;
+    display: flex;
+  }
+
+  .navbar-burger {
+    display: none;
+  }
+
+  .navbar-item,
+  .navbar-link {
+    align-items: center;
+    display: flex;
+  }
+
+  .navbar-item.has-dropdown {
+    align-items: stretch;
+  }
+
+  .navbar-item.is-hoverable:hover .navbar-dropdown {
+    display: block;
+  }
+
+  .navbar-link::after {
+    border-width: 0 0 1px 1px;
+    border-style: solid;
+    content: " ";
+    display: block;
+    height: 0.5em;
+    pointer-events: none;
+    position: absolute;
+    transform: rotate(-45deg);
+    width: 0.5em;
+    margin-top: -0.375em;
+    right: 1.125em;
+    top: 50%;
+  }
+
+  .navbar-menu {
+    flex-grow: 1;
+  }
+
+  .navbar-end {
+    justify-content: flex-end;
+    margin-left: auto;
+  }
+
+  .navbar-dropdown {
+    background-color: #fff;
+    border: 1px solid #e1e1e1;
+    display: none;
+    font-size: 0.875rem;
+    top: 100%;
+    left: 0;
+    min-width: 100%;
+    position: absolute;
+  }
+
+  .navbar-dropdown .navbar-item {
+    padding: 0.5rem 1rem;
+    white-space: nowrap;
+  }
+
+  .navbar-dropdown a.navbar-item {
+    padding-right: 3rem;
+  }
+
+  .navbar-dropdown.is-right {
+    left: auto;
+    right: 0;
+  }
+
+  .navbar-dropdown a.navbar-item:hover {
+    background-color: #fafafa;
+  }
+}
+
+.navbar .button {
+  display: inline-flex;
+  align-items: center;
+  background-color: #fff;
+  border: 1px solid #e1e1e1;
+  border-radius: 0.15rem;
+  height: 1.75rem;
+  color: #333;
+  padding: 0 0.75em;
+  white-space: nowrap;
+}