From 31871147806c2b4a17130f1c9e7de6c2cc7f9cc0 Mon Sep 17 00:00:00 2001
From: Andy Oknen <andy.oknen@yandex.ru>
Date: Wed, 30 Jul 2025 13:21:30 +0000
Subject: [PATCH] Refactor static file serving in WebUI to allow CSS and JS
 access without authentication, and implement theme toggle functionality in
 login and main pages

---
 src/webui/server_dev.go     |  17 ++-
 src/webui/server_prod.go    |  20 ++-
 src/webui/static/index.html |  33 ++++-
 src/webui/static/lang/en.js |   9 +-
 src/webui/static/lang/ru.js |   9 +-
 src/webui/static/login.html | 173 +++++++++++++++++------
 src/webui/static/style.css  | 273 ++++++++++++++++++++++++++----------
 7 files changed, 408 insertions(+), 126 deletions(-)

diff --git a/src/webui/server_dev.go b/src/webui/server_dev.go
index 93c7f044..1da01b37 100644
--- a/src/webui/server_dev.go
+++ b/src/webui/server_dev.go
@@ -15,11 +15,20 @@ import (
 
 // setupStaticHandler configures static file serving for development (files from disk)
 func setupStaticHandler(mux *http.ServeMux, server *WebUIServer) {
-	// Serve static files from disk for development - with auth
+	// Serve static files from disk for development
 	staticHandler := http.StripPrefix("/static/", http.FileServer(http.Dir("src/webui/static/")))
-	mux.HandleFunc("/static/", server.authMiddleware(func(rw http.ResponseWriter, r *http.Request) {
-		staticHandler.ServeHTTP(rw, r)
-	}))
+	mux.HandleFunc("/static/", func(rw http.ResponseWriter, r *http.Request) {
+		// Allow access to CSS and JS files without auth (needed for login page)
+		path := strings.TrimPrefix(r.URL.Path, "/static/")
+		if strings.HasSuffix(path, ".css") || strings.HasSuffix(path, ".js") {
+			staticHandler.ServeHTTP(rw, r)
+			return
+		}
+		// For other static files, require auth
+		server.authMiddleware(func(rw http.ResponseWriter, r *http.Request) {
+			staticHandler.ServeHTTP(rw, r)
+		})(rw, r)
+	})
 }
 
 // serveFile serves any file from disk or returns 404 if not found
diff --git a/src/webui/server_prod.go b/src/webui/server_prod.go
index 7a81d246..5558b742 100644
--- a/src/webui/server_prod.go
+++ b/src/webui/server_prod.go
@@ -25,12 +25,22 @@ func setupStaticHandler(mux *http.ServeMux, server *WebUIServer) {
 		panic("failed to get embedded static files: " + err.Error())
 	}
 
-	// Serve static files from embedded FS - with auth
+	// Serve static files from embedded FS
 	staticHandler := http.FileServer(http.FS(staticFS))
-	mux.HandleFunc("/static/", server.authMiddleware(func(rw http.ResponseWriter, r *http.Request) {
-		// Strip the /static/ prefix before serving
-		http.StripPrefix("/static/", staticHandler).ServeHTTP(rw, r)
-	}))
+	mux.HandleFunc("/static/", func(rw http.ResponseWriter, r *http.Request) {
+		// Allow access to CSS and JS files without auth (needed for login page)
+		path := strings.TrimPrefix(r.URL.Path, "/static/")
+		if strings.HasSuffix(path, ".css") || strings.HasSuffix(path, ".js") {
+			// Strip the /static/ prefix before serving
+			http.StripPrefix("/static/", staticHandler).ServeHTTP(rw, r)
+			return
+		}
+		// For other static files, require auth
+		server.authMiddleware(func(rw http.ResponseWriter, r *http.Request) {
+			// Strip the /static/ prefix before serving
+			http.StripPrefix("/static/", staticHandler).ServeHTTP(rw, r)
+		})(rw, r)
+	})
 }
 
 // serveFile serves any file from embedded files or returns 404 if not found
diff --git a/src/webui/static/index.html b/src/webui/static/index.html
index f41d9c98..5a8cf906 100644
--- a/src/webui/static/index.html
+++ b/src/webui/static/index.html
@@ -19,7 +19,10 @@
                     <p data-key="subtitle">Network mesh management dashboard</p>
                 </div>
                 <div class="header-actions">
-                    <div class="language-switcher">
+                    <div class="controls-group">
+                        <button onclick="toggleTheme()" class="theme-btn" id="theme-btn">
+                            <span class="theme-icon">🌙</span>
+                        </button>
                         <button onclick="switchLanguage('ru')" class="lang-btn" id="lang-ru">RU</button>
                         <button onclick="switchLanguage('en')" class="lang-btn" id="lang-en">EN</button>
                     </div>
@@ -126,6 +129,7 @@
 
     <script>
         let currentLanguage = localStorage.getItem('yggdrasil-language') || 'ru';
+        let currentTheme = localStorage.getItem('yggdrasil-theme') || 'light';
 
         function updateTexts() {
             const elements = document.querySelectorAll('[data-key]');
@@ -137,6 +141,28 @@
             });
         }
 
+        function toggleTheme() {
+            currentTheme = currentTheme === 'light' ? 'dark' : 'light';
+            localStorage.setItem('yggdrasil-theme', currentTheme);
+            applyTheme();
+        }
+
+        function applyTheme() {
+            const body = document.body;
+            const themeIcon = document.querySelector('.theme-icon');
+            const themeBtn = document.getElementById('theme-btn');
+
+            if (currentTheme === 'dark') {
+                body.setAttribute('data-theme', 'dark');
+                themeIcon.textContent = '☀️';
+                themeBtn.title = window.translations[currentLanguage]['theme_light'] || 'Light theme';
+            } else {
+                body.removeAttribute('data-theme');
+                themeIcon.textContent = '🌙';
+                themeBtn.title = window.translations[currentLanguage]['theme_dark'] || 'Dark theme';
+            }
+        }
+
         function switchLanguage(lang) {
             currentLanguage = lang;
             localStorage.setItem('yggdrasil-language', lang);
@@ -146,6 +172,7 @@
             document.getElementById('lang-' + lang).classList.add('active');
 
             updateTexts();
+            applyTheme(); // Update theme button tooltip
         }
 
         function logout() {
@@ -174,12 +201,14 @@
             event.target.closest('.nav-item').classList.add('active');
         }
 
-        // Initialize language on page load
+        // Initialize language and theme on page load
         document.addEventListener('DOMContentLoaded', function () {
             // Set active language button
             document.getElementById('lang-' + currentLanguage).classList.add('active');
             // Update all texts
             updateTexts();
+            // Apply saved theme
+            applyTheme();
         });
     </script>
 </body>
diff --git a/src/webui/static/lang/en.js b/src/webui/static/lang/en.js
index 7001e9c2..ca88564d 100644
--- a/src/webui/static/lang/en.js
+++ b/src/webui/static/lang/en.js
@@ -29,5 +29,12 @@ window.translations.en = {
     'network_settings_description': 'Network interaction parameters',
     'coming_soon': 'Coming soon...',
     'footer_text': 'Yggdrasil Network • Minimal WebUI v1.0',
-    'logout_confirm': 'Are you sure you want to logout?'
+    'logout_confirm': 'Are you sure you want to logout?',
+    'theme_light': 'Light theme',
+    'theme_dark': 'Dark theme',
+    'login_subtitle': 'Enter password to access the web interface',
+    'password_label': 'Password:',
+    'access_dashboard': 'Access Dashboard',
+    'error_invalid_password': 'Invalid password. Please try again.',
+    'error_too_many_attempts': 'Too many failed attempts. Please wait 1 minute before trying again.'
 }; 
\ No newline at end of file
diff --git a/src/webui/static/lang/ru.js b/src/webui/static/lang/ru.js
index 09586a6f..7dd6b5c1 100644
--- a/src/webui/static/lang/ru.js
+++ b/src/webui/static/lang/ru.js
@@ -29,5 +29,12 @@ window.translations.ru = {
     'network_settings_description': 'Параметры сетевого взаимодействия',
     'coming_soon': 'Функция в разработке...',
     'footer_text': 'Yggdrasil Network • Minimal WebUI v1.0',
-    'logout_confirm': 'Вы уверены, что хотите выйти?'
+    'logout_confirm': 'Вы уверены, что хотите выйти?',
+    'theme_light': 'Светлая тема',
+    'theme_dark': 'Темная тема',
+    'login_subtitle': 'Введите пароль для доступа к веб-интерфейсу',
+    'password_label': 'Пароль:',
+    'access_dashboard': 'Войти в панель',
+    'error_invalid_password': 'Неверный пароль. Попробуйте снова.',
+    'error_too_many_attempts': 'Слишком много неудачных попыток. Подождите 1 минуту перед повторной попыткой.'
 }; 
\ No newline at end of file
diff --git a/src/webui/static/login.html b/src/webui/static/login.html
index 43e38a7f..c829aa34 100644
--- a/src/webui/static/login.html
+++ b/src/webui/static/login.html
@@ -6,7 +6,18 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Yggdrasil Web Interface - Login</title>
     <link rel="stylesheet" href="static/style.css">
+    <script src="static/lang/ru.js"></script>
+    <script src="static/lang/en.js"></script>
     <style>
+        body {
+            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+            background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
+            min-height: 100vh;
+            color: var(--text-primary);
+            margin: 0;
+            padding: 0;
+        }
+
         .login-container {
             display: flex;
             align-items: center;
@@ -16,24 +27,27 @@
         }
 
         .login-form {
-            background: white;
-            border-radius: 12px;
+            background: var(--bg-info-card);
+            border-radius: 4px;
             padding: 40px;
-            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
+            box-shadow: 0 2px 8px var(--shadow-dark);
+            border: 1px solid var(--border-card);
             width: 100%;
             max-width: 400px;
             text-align: center;
         }
 
         .login-form h1 {
-            color: #495057;
+            color: var(--text-heading);
             margin-bottom: 10px;
             font-size: 2rem;
+            font-weight: 700;
         }
 
         .login-form p {
-            color: #6c757d;
+            color: var(--text-body);
             margin-bottom: 30px;
+            font-weight: 500;
         }
 
         .form-group {
@@ -44,95 +58,164 @@
         .form-group label {
             display: block;
             margin-bottom: 5px;
-            color: #495057;
-            font-weight: 500;
+            color: var(--text-heading);
+            font-weight: 600;
         }
 
         .form-group input {
             width: 100%;
             padding: 12px;
-            border: 1px solid #ced4da;
-            border-radius: 6px;
+            border: 1px solid var(--border-card);
+            border-radius: 2px;
             font-size: 16px;
             transition: border-color 0.2s ease;
+            background: var(--bg-status-card);
+            color: var(--text-body);
+            font-weight: 500;
         }
 
         .form-group input:focus {
             outline: none;
-            border-color: #667eea;
-            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
+            border-color: var(--border-hover);
+            box-shadow: 0 1px 4px var(--shadow-light);
         }
 
         .form-group input:disabled {
-            background-color: #f8f9fa;
-            border-color: #e9ecef;
-            color: #6c757d;
+            background-color: var(--bg-nav-item);
+            border-color: var(--border-nav-item);
+            color: var(--text-muted);
             cursor: not-allowed;
         }
 
         .login-button {
             width: 100%;
-            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
-            color: white;
-            border: none;
-            padding: 12px;
-            border-radius: 6px;
+            background: var(--bg-nav-active);
+            color: var(--text-white);
+            border: 1px solid var(--bg-nav-active-border);
+            padding: 12px 16px;
+            border-radius: 2px;
             font-size: 16px;
-            font-weight: 500;
+            font-weight: 600;
             cursor: pointer;
-            transition: transform 0.2s ease, box-shadow 0.2s ease;
+            transition: background 0.2s ease, box-shadow 0.2s ease;
         }
 
         .login-button:hover {
-            transform: translateY(-1px);
-            box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
-        }
-
-        .login-button:active {
-            transform: translateY(0);
+            background: var(--bg-nav-active-border);
+            box-shadow: 0 2px 8px var(--shadow-medium);
         }
 
         .error-message {
-            background: #f8d7da;
-            color: #721c24;
-            border: 1px solid #f1aeb5;
-            border-radius: 6px;
-            padding: 10px;
+            background: var(--bg-status-card);
+            color: var(--bg-logout);
+            border: 1px solid var(--border-logout);
+            border-radius: 2px;
+            padding: 12px;
             margin-bottom: 20px;
             display: none;
+            font-weight: 500;
         }
 
         .lock-icon {
             font-size: 3rem;
             margin-bottom: 20px;
-            color: #667eea;
+            color: var(--bg-nav-active);
+        }
+
+        .login-header {
+            position: absolute;
+            top: 20px;
+            right: 20px;
+            z-index: 10;
+        }
+
+        .login-container {
+            position: relative;
+            z-index: 1;
         }
     </style>
 </head>
 
 <body>
+    <div class="login-header">
+        <div class="controls-group">
+            <button onclick="toggleTheme()" class="theme-btn" id="theme-btn">
+                <span class="theme-icon">🌙</span>
+            </button>
+            <button onclick="switchLanguage('ru')" class="lang-btn" id="lang-ru">RU</button>
+            <button onclick="switchLanguage('en')" class="lang-btn" id="lang-en">EN</button>
+        </div>
+    </div>
+
     <div class="login-container">
         <form class="login-form" onsubmit="return handleLogin(event)">
             <div class="lock-icon">🔒</div>
-            <h1>🌳 Yggdrasil</h1>
-            <p>Enter password to access the web interface</p>
+            <h1 data-key="title">🌳 Yggdrasil</h1>
+            <p data-key="login_subtitle">Enter password to access the web interface</p>
 
             <div class="error-message" id="errorMessage">
-                Invalid password. Please try again.
+                <span data-key="error_invalid_password">Invalid password. Please try again.</span>
             </div>
 
             <div class="form-group">
-                <label for="password">Password:</label>
+                <label for="password" data-key="password_label">Password:</label>
                 <input type="password" id="password" name="password" required autofocus>
             </div>
 
-            <button type="submit" class="login-button">
+            <button type="submit" class="login-button" data-key="access_dashboard">
                 Access Dashboard
             </button>
         </form>
     </div>
 
     <script>
+        let currentLanguage = localStorage.getItem('yggdrasil-language') || 'ru';
+        let currentTheme = localStorage.getItem('yggdrasil-theme') || 'light';
+
+        function updateTexts() {
+            const elements = document.querySelectorAll('[data-key]');
+            elements.forEach(element => {
+                const key = element.getAttribute('data-key');
+                if (window.translations && window.translations[currentLanguage] && window.translations[currentLanguage][key]) {
+                    element.textContent = window.translations[currentLanguage][key];
+                }
+            });
+        }
+
+        function toggleTheme() {
+            currentTheme = currentTheme === 'light' ? 'dark' : 'light';
+            localStorage.setItem('yggdrasil-theme', currentTheme);
+            applyTheme();
+        }
+
+        function applyTheme() {
+            const body = document.body;
+            const themeIcon = document.querySelector('.theme-icon');
+            const themeBtn = document.getElementById('theme-btn');
+
+            if (currentTheme === 'dark') {
+                body.setAttribute('data-theme', 'dark');
+                themeIcon.textContent = '☀️';
+                themeBtn.title = window.translations[currentLanguage]['theme_light'] || 'Light theme';
+            } else {
+                body.removeAttribute('data-theme');
+                themeIcon.textContent = '🌙';
+                themeBtn.title = window.translations[currentLanguage]['theme_dark'] || 'Dark theme';
+            }
+        }
+
+        function switchLanguage(lang) {
+            currentLanguage = lang;
+            localStorage.setItem('yggdrasil-language', lang);
+
+            // Update active button
+            document.querySelectorAll('.lang-btn').forEach(btn => btn.classList.remove('active'));
+            document.getElementById('lang-' + lang).classList.add('active');
+
+            updateTexts();
+            applyTheme(); // Update theme button tooltip
+        }
+
         async function handleLogin(event) {
             event.preventDefault();
 
@@ -153,7 +236,7 @@
                     window.location.href = '/';
                 } else if (response.status === 429) {
                     // Too many requests - IP blocked
-                    errorMessage.textContent = 'Too many failed attempts. Please wait 1 minute before trying again.';
+                    errorMessage.querySelector('span').textContent = window.translations[currentLanguage]['error_too_many_attempts'] || 'Too many failed attempts. Please wait 1 minute before trying again.';
                     errorMessage.style.display = 'block';
                     document.getElementById('password').value = '';
                     document.getElementById('password').disabled = true;
@@ -166,7 +249,7 @@
                     }, 60000);
                 } else {
                     // Invalid password
-                    errorMessage.textContent = 'Invalid password. Please try again.';
+                    errorMessage.querySelector('span').textContent = window.translations[currentLanguage]['error_invalid_password'] || 'Invalid password. Please try again.';
                     errorMessage.style.display = 'block';
                     document.getElementById('password').value = '';
                     document.getElementById('password').focus();
@@ -183,6 +266,16 @@
         document.getElementById('password').addEventListener('input', function () {
             document.getElementById('errorMessage').style.display = 'none';
         });
+
+        // Initialize language and theme on page load
+        document.addEventListener('DOMContentLoaded', function () {
+            // Set active language button
+            document.getElementById('lang-' + currentLanguage).classList.add('active');
+            // Update all texts
+            updateTexts();
+            // Apply saved theme
+            applyTheme();
+        });
     </script>
 </body>
 
diff --git a/src/webui/static/style.css b/src/webui/static/style.css
index 3aae1d3a..0249120e 100644
--- a/src/webui/static/style.css
+++ b/src/webui/static/style.css
@@ -1,3 +1,91 @@
+/* Light theme (default) */
+:root {
+    /* Background colors */
+    --bg-primary: #667eea;
+    --bg-secondary: #764ba2;
+    --bg-sidebar: #ffffff;
+    --bg-nav-item: #f8f9fa;
+    --bg-nav-hover: #e9ecef;
+    --bg-nav-active: #3498db;
+    --bg-nav-active-border: #2980b9;
+    --bg-main-content: #fafafa;
+    --bg-status-card: #f5f5f5;
+    --bg-info-card: #ffffff;
+    --bg-logout: #dc3545;
+    --bg-logout-hover: #c82333;
+    --bg-lang-switcher: rgba(255, 255, 255, 0.2);
+    --bg-lang-btn-hover: rgba(255, 255, 255, 0.3);
+    --bg-lang-btn-active: rgba(255, 255, 255, 0.4);
+
+    /* Border colors */
+    --border-sidebar: #e0e0e0;
+    --border-nav-item: #dee2e6;
+    --border-main: #e0e0e0;
+    --border-card: #e0e0e0;
+    --border-hover: #3498db;
+    --border-footer: #dee2e6;
+    --border-logout: #c82333;
+    --border-lang: rgba(255, 255, 255, 0.3);
+
+    /* Text colors */
+    --text-primary: #333;
+    --text-white: white;
+    --text-nav: #495057;
+    --text-heading: #343a40;
+    --text-body: #495057;
+    --text-muted: #6c757d;
+
+    /* Shadow colors */
+    --shadow-light: rgba(0, 0, 0, 0.1);
+    --shadow-medium: rgba(0, 0, 0, 0.15);
+    --shadow-dark: rgba(0, 0, 0, 0.2);
+    --shadow-heavy: rgba(0, 0, 0, 0.3);
+}
+
+/* Dark theme */
+[data-theme="dark"] {
+    /* Background colors */
+    --bg-primary: #2c3e50;
+    --bg-secondary: #34495e;
+    --bg-sidebar: #37474f;
+    --bg-nav-item: #455a64;
+    --bg-nav-hover: #546e7a;
+    --bg-nav-active: #3498db;
+    --bg-nav-active-border: #2980b9;
+    --bg-main-content: #37474f;
+    --bg-status-card: #455a64;
+    --bg-info-card: #455a64;
+    --bg-logout: #dc3545;
+    --bg-logout-hover: #c82333;
+    --bg-lang-switcher: rgba(0, 0, 0, 0.3);
+    --bg-lang-btn-hover: rgba(255, 255, 255, 0.1);
+    --bg-lang-btn-active: rgba(255, 255, 255, 0.2);
+
+    /* Border colors */
+    --border-sidebar: #455a64;
+    --border-nav-item: #546e7a;
+    --border-main: #455a64;
+    --border-card: #546e7a;
+    --border-hover: #3498db;
+    --border-footer: #546e7a;
+    --border-logout: #c82333;
+    --border-lang: rgba(255, 255, 255, 0.3);
+
+    /* Text colors */
+    --text-primary: #333;
+    --text-white: white;
+    --text-nav: #eceff1;
+    --text-heading: #eceff1;
+    --text-body: #cfd8dc;
+    --text-muted: #b0bec5;
+
+    /* Shadow colors */
+    --shadow-light: rgba(0, 0, 0, 0.2);
+    --shadow-medium: rgba(0, 0, 0, 0.3);
+    --shadow-dark: rgba(0, 0, 0, 0.4);
+    --shadow-heavy: rgba(0, 0, 0, 0.5);
+}
+
 * {
     margin: 0;
     padding: 0;
@@ -5,10 +93,10 @@
 }
 
 body {
-    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
     min-height: 100vh;
-    color: #333;
+    color: var(--text-primary);
 }
 
 .container {
@@ -19,7 +107,7 @@ body {
 
 header {
     margin-bottom: 40px;
-    color: white;
+    color: var(--text-white);
 }
 
 .header-content {
@@ -35,33 +123,58 @@ header {
     gap: 15px;
 }
 
-.language-switcher {
+.controls-group {
     display: flex;
-    background: rgba(255, 255, 255, 0.15);
-    border-radius: 8px;
-    padding: 4px;
-    border: 1px solid rgba(255, 255, 255, 0.2);
+    background: var(--bg-lang-switcher);
+    border-radius: 2px;
+    padding: 2px;
+    border: 1px solid var(--border-lang);
+    gap: 2px;
+}
+
+.theme-btn {
+    background: transparent;
+    color: var(--text-white);
+    border: none;
+    padding: 6px 12px;
+    border-radius: 1px;
+    cursor: pointer;
+    font-size: 12px;
+    font-weight: 600;
+    transition: background 0.2s ease;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
+.theme-btn:hover {
+    background: var(--bg-lang-btn-hover);
+}
+
+.theme-icon {
+    display: block;
+    transition: transform 0.3s ease;
+    font-size: 12px;
 }
 
 .lang-btn {
     background: transparent;
-    color: white;
+    color: var(--text-white);
     border: none;
     padding: 6px 12px;
-    border-radius: 6px;
+    border-radius: 1px;
     cursor: pointer;
     font-size: 12px;
-    font-weight: 500;
-    transition: all 0.2s ease;
+    font-weight: 600;
+    transition: background 0.2s ease;
 }
 
 .lang-btn:hover {
-    background: rgba(255, 255, 255, 0.2);
+    background: var(--bg-lang-btn-hover);
 }
 
 .lang-btn.active {
-    background: rgba(255, 255, 255, 0.3);
-    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
+    background: var(--bg-lang-btn-active);
 }
 
 .header-content > div:first-child {
@@ -70,9 +183,11 @@ header {
 }
 
 header h1 {
-    font-size: 2.5rem;
+    font-size: 2.2rem;
     margin-bottom: 10px;
-    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
+    text-shadow: 1px 1px 2px var(--shadow-heavy);
+    font-weight: 700;
+    letter-spacing: -0.5px;
 }
 
 header p {
@@ -83,20 +198,20 @@ header p {
 .sidebar-footer {
     margin-top: 20px;
     padding-top: 20px;
-    border-top: 1px solid rgba(255, 255, 255, 0.2);
+    border-top: 1px solid var(--border-footer);
 }
 
 .logout-btn {
     width: 100%;
-    background: rgba(220, 53, 69, 0.2);
-    color: white;
-    border: 1px solid rgba(220, 53, 69, 0.3);
-    padding: 12px 16px;
-    border-radius: 10px;
+    background: var(--bg-logout);
+    color: var(--text-white);
+    border: 1px solid var(--border-logout);
+    padding: 10px 16px;
+    border-radius: 2px;
     cursor: pointer;
     font-size: 14px;
-    font-weight: 500;
-    transition: all 0.3s ease;
+    font-weight: 600;
+    transition: background 0.2s ease;
     display: flex;
     align-items: center;
     justify-content: center;
@@ -104,9 +219,7 @@ header p {
 }
 
 .logout-btn:hover {
-    background: rgba(220, 53, 69, 0.3);
-    transform: translateY(-2px);
-    box-shadow: 0 4px 15px rgba(220, 53, 69, 0.2);
+    background: var(--bg-logout-hover);
 }
 
 .logout-btn:before {
@@ -122,12 +235,11 @@ header p {
 
 .sidebar {
     min-width: 250px;
-    background: rgba(255, 255, 255, 0.15);
-    backdrop-filter: blur(10px);
-    border-radius: 12px;
+    background: var(--bg-sidebar);
+    border-radius: 4px;
     padding: 20px;
-    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
-    border: 1px solid rgba(255, 255, 255, 0.18);
+    box-shadow: 0 2px 8px var(--shadow-heavy);
+    border: 1px solid var(--border-sidebar);
     display: flex;
     flex-direction: column;
     justify-content: space-between;
@@ -143,25 +255,24 @@ header p {
     display: flex;
     align-items: center;
     gap: 12px;
-    padding: 15px 18px;
-    background: rgba(255, 255, 255, 0.1);
-    border-radius: 10px;
+    padding: 12px 16px;
+    background: var(--bg-nav-item);
+    border-radius: 2px;
     cursor: pointer;
-    transition: all 0.3s ease;
-    color: white;
-    border: 1px solid rgba(255, 255, 255, 0.2);
+    transition: background 0.2s ease;
+    color: var(--text-nav);
+    border: 1px solid var(--border-nav-item);
+    font-weight: 500;
 }
 
 .nav-item:hover {
-    background: rgba(255, 255, 255, 0.2);
-    transform: translateY(-2px);
-    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
+    background: var(--bg-nav-hover);
 }
 
 .nav-item.active {
-    background: rgba(255, 255, 255, 0.25);
-    border-color: rgba(255, 255, 255, 0.4);
-    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
+    background: var(--bg-nav-active);
+    border-color: var(--bg-nav-active-border);
+    color: var(--text-white);
 }
 
 .nav-icon {
@@ -175,12 +286,11 @@ header p {
 
 .main-content {
     flex: 1;
-    background: rgba(255, 255, 255, 0.95);
-    border-radius: 12px;
+    background: var(--bg-main-content);
+    border-radius: 4px;
     padding: 30px;
-    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
-    backdrop-filter: blur(10px);
-    border: 1px solid rgba(255, 255, 255, 0.18);
+    box-shadow: 0 2px 8px var(--shadow-dark);
+    border: 1px solid var(--border-main);
 }
 
 .content-section {
@@ -192,13 +302,25 @@ header p {
 }
 
 .status-card {
-    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
-    border-radius: 15px;
-    padding: 25px;
+    background: var(--bg-status-card);
+    border-radius: 4px;
+    padding: 20px;
     margin-bottom: 30px;
     text-align: center;
-    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
-    border: 1px solid rgba(255, 255, 255, 0.5);
+    box-shadow: 0 1px 4px var(--shadow-light);
+    border: 1px solid var(--border-card);
+}
+
+.status-card h2 {
+    color: var(--text-heading);
+    font-weight: 700;
+    margin-bottom: 15px;
+    font-size: 1.3rem;
+}
+
+.status-card p {
+    color: var(--text-body);
+    font-weight: 500;
 }
 
 .status-indicator {
@@ -213,11 +335,11 @@ header p {
     width: 12px;
     height: 12px;
     border-radius: 50%;
-    background: #6c757d;
+    background: var(--text-muted);
 }
 
 .status-dot.active {
-    background: #28a745;
+    background: var(--bg-nav-active);
     animation: pulse 2s infinite;
 }
 
@@ -234,39 +356,44 @@ header p {
 }
 
 .info-card {
-    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
-    border: 1px solid rgba(233, 236, 239, 0.6);
-    border-radius: 15px;
-    padding: 25px;
+    background: var(--bg-info-card);
+    border: 1px solid var(--border-card);
+    border-radius: 4px;
+    padding: 20px;
     text-align: center;
-    transition: all 0.3s ease;
-    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
+    transition: box-shadow 0.2s ease;
+    box-shadow: 0 1px 4px var(--shadow-light);
 }
 
 .info-card:hover {
-    transform: translateY(-5px);
-    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
-    border-color: rgba(102, 126, 234, 0.3);
+    box-shadow: 0 2px 8px var(--shadow-medium);
+    border-color: var(--border-hover);
 }
 
 .info-card h3 {
-    color: #495057;
+    color: var(--text-heading);
     margin-bottom: 10px;
+    font-weight: 600;
+    font-size: 1.1rem;
 }
 
 .info-card p {
-    color: #6c757d;
+    color: var(--text-body);
     margin-bottom: 10px;
+    font-weight: 500;
 }
 
 .info-card small {
-    color: #adb5bd;
-    font-style: italic;
+    color: var(--text-muted);
+    font-weight: 500;
+    text-transform: uppercase;
+    font-size: 0.75rem;
+    letter-spacing: 0.5px;
 }
 
 footer {
     text-align: center;
-    color: white;
+    color: var(--text-white);
     opacity: 0.8;
 }
 
@@ -310,7 +437,7 @@ footer {
         margin-left: 15px;
         padding-top: 0;
         border-top: none;
-        border-left: 1px solid rgba(255, 255, 255, 0.2);
+        border-left: 1px solid var(--border-footer);
         padding-left: 15px;
     }