major features update

static/index.css

@@ -0,0 +1,101 @@
+html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,summary,time,mark,audio,video{box-sizing:border-box;margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:before,blockquote:after,q:before,q:after{content:'';content:none}table{border-collapse:collapse;border-spacing:0}
+
+:root {
+  --main-bg-color: #f2f3f6;
+  --line-color: #8b687f;
+  --link-color: #3e7543;
+}
+
+body {
+  width: 100%;
+  min-height: 100vh;
+  font-size: 24px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 1em;
+  background-color: var(--main-bg-color);
+}
+
+body > header {
+  display: flex;
+  flex-direction: row;
+  gap: 0.5em;
+  border-bottom: 1px solid var(--line-color);
+  padding-bottom: 0.5em;
+  width: 100%;
+  @media only screen and (min-width: 651px) {
+    #sidebar-show-hide { display: none; }
+  }
+  h1 {
+    flex: 1;
+  }
+}
+
+section#content {
+  display: flex;
+  flex-direction: row;
+  width: 100%;
+  @media only screen and (max-width: 650px) {
+    position: relative;
+  }
+}
+
+#contacts-sidebar {
+  display: flex;
+  flex-direction: column;
+  padding-right: 1em;
+  @media only screen and (max-width: 650px) {
+    position: absolute;
+    float: left;
+    z-index: 1;
+    left: 0;
+    width: 100%;
+    background-color: #0003;
+    height: 100%;
+
+    &.hide {
+      display: none;
+    }
+  }
+
+  ul {
+    flex: 1;
+    width: fit-content;
+    background-color: var(--main-bg-color);
+    padding: 0.5em 1em 0 0;
+    @media only screen and (min-width: 651px) {
+      border-right: 1px solid var(--line-color);
+    }
+
+    button {
+      width: 100%;
+    }
+  }
+
+  li {
+    border-bottom: 1px solid var(--line-color);
+    padding: 0.5em 0;
+    &:last-of-type {
+      border-bottom: none;
+    }
+  }
+}
+
+main {
+  display: flex;
+  flex-direction: column;
+  flex: 1;
+}
+
+.icon {
+  width: 1em;
+  height: 1em;
+  vertical-align: -0.125em;
+  overflow: visible;
+}
+
+a, a:visited {
+  color: var(--link-color);
+  text-decoration: underline dotted;
+}