WebApp production ver

Web/css/index.css

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+html, body {
+    height: 100%;
+    margin: 0;
+}
+
+body {
+    display: flex;
+    flex-direction: column;
+}
+
+main {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    justify-content: flex-start;
+    align-items: center;
+    padding-top: 7%;
+}
+
+.fixed {
+    -ms-flex: 0 0 300px;
+    flex: 0 0 300px;
+    min-width: 300px;
+}
+
+.hover-effect {
+    transition: opacity 0.3s ease;
+}
+
+.hover-effect:hover {
+    opacity: 0.8;
+}
+
+.theme-toggle {
+    position: fixed;
+    top: 20px;
+    right: 20px;
+    z-index: 1000;
+}
+
+.theme-light .dark-logo {
+    display: none;
+}
+
+.theme-dark .light-logo {
+    display: none;
+}

Web/css/preloader.css

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+/* Preloader styles */
+.preloader {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    z-index: 9999;
+    transition: opacity 0.5s;
+}
+
+.theme-light .preloader {
+    background-color: #ffffff;
+}
+
+.theme-dark .preloader {
+    background-color: #212529;
+}
+
+.spinner {
+    width: 50px;
+    height: 50px;
+    border: 5px solid rgba(0, 0, 0, 0.1);
+    border-radius: 50%;
+    border-top-color: #0d6efd;
+    animation: spin 1s ease-in-out infinite;
+}
+
+.theme-dark .spinner {
+    border: 5px solid rgba(255, 255, 255, 0.1);
+    border-top-color: #0d6efd;
+}
+
+@keyframes spin {
+    to {
+        transform: rotate(360deg);
+    }
+}
+
+.fade-in {
+    opacity: 0;
+    animation: fadeIn 0.5s forwards;
+}
+
+@keyframes fadeIn {
+    to {
+        opacity: 1;
+    }
+}
+
+.content-wrapper {
+    opacity: 0;
+    transition: opacity 0.3s;
+}
+
+.content-wrapper.visible {
+    opacity: 1;
+}