New commit

-  Added Audio 🎧
  -  Added system calls 🛠
  -  Started to reimplement UI 🖼
  -  Implemented skin change drop-down 👕

app/assets/css/index.css

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+@import url("https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100..900;1,100..900&display=swap");
+@import url("https://cdn.jsdelivr.net/gh/hung1001/font-awesome-pro@4cac1a6/css/all.css");
+
+* {
+    margin: 0px;
+    padding: 0px;
+    box-sizing: border-box;
+    font-family: "Roboto", sans-serif;
+}
+
+body {
+    background-image: url("../img/index_wallpaper.gif");
+    background-size: cover;
+    background-repeat: no-repeat;
+    background-position: center center;
+    background-attachment: fixed;
+}
+
+main {
+    position: absolute;
+    top: 0px;
+    left: 0px;
+    right: 0px;
+    bottom: 0px;
+    width: 100%;
+    height: 100%;
+}
+
+main > nav {
+    margin-left: 1rem;
+    width: 20%;
+    height: 100%;
+    background-color: #3e3e3ee6;
+}
+
+main > nav > img {
+    width: 70%;
+    margin-left: 15%;
+    margin-top: 3%;
+    margin-bottom: 10px;
+}
+
+details > article {
+    margin-left: 20px;
+    margin-right: 20px;
+    margin-top: 5px;
+    background-color: #343434;
+    padding: 7px 7px 7px 7px;
+    color: #ffffff;
+    box-shadow: rgba(0, 0, 0, 0.5) 0px 3px 8px;
+}
+
+details > summary {
+    text-align: center;
+    list-style: none;
+}
+
+button.nav {
+    position: relative;
+    width: 100%;
+    height: 40px;
+    border: none;
+    font-size: large;
+    text-align: left;
+    padding: 13px 13px 13px 13px;
+    margin-bottom: 10px;
+    background-color: transparent;
+}
+
+button.nav > i {
+    position: relative;
+    width: 35px;
+    height: 35px;
+    margin-left: 8px;
+    text-align: center;
+    padding-top: 0.67rem;
+    border-radius: 10px;
+    vertical-align: middle;
+    background-color: gray;
+}
+
+button.nav > span {
+    margin-left: 12px;
+    color: #ffffff;
+}
+
+fieldset {
+    font-size: small;
+    border: none;
+}
+
+fieldset > legend {
+    font-weight: bolder;
+    margin-bottom: 5px;
+}
+
+input[type=radio] {
+    accent-color: #12865c;
+}
+
+button.classic {
+    width: 96%;
+    height: 30px;
+    margin-left: 2%;
+    margin-top: 5px;
+    border: none;
+    color: #ffffff;
+    border-radius: 5px;
+    background-color: #39aa6d;
+}

app/assets/js/inex.js

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+const audio = new Audio()
+
+function startAudio() {
+    audio.src = "/app/assets/audio/Golden Hill (Radio Edit).mp3"
+    audio.loop = true
+    audio.onended = () => {
+        if (!audio.paused) {
+            audio.play()
+        }
+    }
+}
+
+function muteAudio() {
+    audio.muted = true
+}
+
+function unmuteAudio() {
+    audio.muted = false
+}