split up css style files

styles/layout/main_content.css

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+.main-content {
+    margin-left: var(--nav-w);
+    --margin-main-content: 7vw;
+    --margin-top: 100px;
+}
+
+@media (max-width: 1500px) {
+    .main-content {
+        --margin-main-content: 4vw;
+    }
+}
+
+@media (max-width: 1000px) or (max-height: 700px) {
+    .main-content {
+        margin-left: 0;
+        --margin-main-content: 20px;
+        --margin-top: 50px;
+    }
+}

styles/layout/mobile_bar.css

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+#navbar-mobile {
+    position: fixed;
+    top: 0;
+    left: 0;
+    display: flex;
+    flex-direction: column;
+    width: var(--nav-mobile-w);
+    height: 100vh;
+    justify-content: flex-start;
+    align-items: center;
+    border-right: 1px solid var(--border);
+    gap: 10px;
+    transition: left 0.3s;
+    -webkit-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+    z-index: 10;
+}
+
+#navbar-mobile::before {
+    content: "";
+    position: absolute;
+    inset: 0;
+    background: var(--bg);
+    opacity: 0.992;
+    z-index: -1;
+}
+
+#navbar-mobile.inactive {
+    left: calc(var(--nav-mobile-w) * (-1))
+}
+
+/* Hidden together with the menu button (mobile_menu_button.css) on large screens */
+@media (min-width: 1001px) and (min-height: 701px) {
+    #navbar-mobile {
+        display: none;
+    }
+}
+
+#navbar-mobile-links {
+    display: flex;
+    flex-direction: column;
+    justify-content: flex-start;
+    align-items: center;
+    width: 100%;
+    border-bottom: 1px solid var(--border);
+    height: fit-content;
+}
+
+.navbar-item-mobile {
+    width: 100%;
+    height: 8vh;
+    list-style: none;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    border-top: 1px solid var(--border);
+}
+
+@media (hover: hover) and (pointer: fine) {
+    .navbar-item-mobile:hover {
+        background: var(--surface);
+    }
+}
+
+.nav-link-mobile {
+    text-align: center;
+    font-size: calc(var(--font-size) - 0.2rem);
+    width: 100%;
+    height: 100%;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    padding: 10px;
+}
+
+.mobile-config {
+    display: flex;
+    flex-direction: column;
+    align-items: flex-start;
+    margin-top: auto;
+    margin-bottom: 20px;
+    gap: 20px;
+    height: fit-content;
+    width: 100%;
+}
+
+.mobile-config .switch {
+    margin-left: 40px;
+    ;
+}
+
+.mobile-config .lang-dropdown {
+    margin-left: 19.5px;
+}

styles/layout/navbar.css

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+/* Navbar */
+
+#navbar {
+    list-style: none;
+    display: flex;
+    flex-direction: column;
+    padding: var(--padding);
+}
+
+.navbar-group {
+    margin-top: 25px;
+    margin-bottom: 5px;
+    font-size: calc(var(--font-size) + 0.1rem);
+    font-family: var(--serif);
+}
+
+.navbar-item {
+    -webkit-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+    position: relative;
+    font-weight: normal;
+    margin: 5px 0px 5px 0px;
+    user-select: none;
+}
+
+.nav-link {
+    font-size: 0.75rem;
+}
+
+@media (hover: hover) and (pointer: fine) {
+    .nav-link:hover {
+        color: var(--text);
+    }
+}
+
+.nav-link.active {
+    color: var(--text);
+    font-weight: bold;
+}
+
+.nav-link::before {
+    content: "";
+    position: absolute;
+    background: var(--text);
+    width: 2px;
+    height: 0px;
+    top: 50%;
+    transform: translateY(-50%);
+    left: calc(var(--padding) * (-1) + 1px);
+    border-radius: 20px;
+    transition: height 0.18s;
+}
+
+.nav-link.active::before {
+    height: 14px;
+}
+
+.idx {
+    font-weight: normal;
+    font-size: 0.75rem;
+}

styles/layout/sidebar.css

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+.sidebar {
+    position: fixed;
+    top: 0;
+    left: 0;
+    border-right: 1px solid var(--border);
+    width: var(--nav-w);
+    height: 100vh;
+    padding: 0;
+    margin: 0;
+    display: flex;
+    flex-direction: column;
+    background-color: var(--bg);
+
+    --padding: 30px;
+}
+
+@media (max-width: 1000px) or (max-height: 700px) {
+    .sidebar {
+        display: none;
+    }
+}
+
+/* Sidebar Top */
+
+#sidebar-top {
+    border-bottom: 1px solid var(--border);
+    padding: var(--padding);
+    padding-top: calc(var(--padding) * 2);
+    display: flex;
+    flex-direction: column;
+    gap: 20px;
+}
+
+#sidebar-top-head {
+    padding: 0;
+    margin: 0;
+}
+
+#sidebar-top-content {
+    padding: 0;
+    margin: 0;
+    display: flex;
+    flex-direction: column;
+    gap: 0px;
+}
+
+#sidebar-top-content p {
+    font-size: calc(var(--font-size) - 0.15rem);
+    margin: 0;
+    padding: 0;
+    height: fit-content;
+    width: fit-content;
+}
+
+/* Sidebar Bottom */
+
+.sidebar-bottom-margin {
+    margin-top: auto;
+}
+
+/* Language and Color */
+
+.website-config {
+    height: fit-content;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    border-bottom: 1px solid var(--border);
+    padding-bottom: 20px;
+    gap: 20px;
+    -webkit-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+}
+
+/* Contact */
+
+#sidebar-bottom {
+    height: 100px;
+    padding: calc(var(--padding) / 2);
+    display: flex;
+    flex-direction: column;
+    justify-content: space-evenly;
+    align-items: flex-start;
+}
+
+#sidebar-bottom a {
+    font-size: calc(var(--font-size) - 0.15rem);
+}