:root {
    --primary-color: #4285F4;
    --secondary-color: #34A853;
    --accent-color: #FBBC05;
    --danger-color: #EA4335;
    --background-light: #F8F9FA;
    --text-dark: #202124;
    --text-light: #70757A;
    --sidebar-width: 260px;
    --header-height: 70px;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --border-radius: 10px;
    --transition: all 0.3s ease;
}

/* Dark Mode */
body.dark-mode {
    --background-light: #202124;
    --text-dark: #F8F9FA;
    --text-light: #BDC1C6;
    --shadow: 0 2px 10px rgba(255, 255, 255, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-light);
    color: var(--text-dark);
    line-height: 1.6;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    width: var(--sidebar-width);
    background-color: #0A2647;
    color: white;
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
}

.logo-container {
    text-align: center;
    padding: 20px 0;
}

.logo {
    max-width: 80px;
    height: auto;
}

.logo-text {
    margin-top: 10px;
    font-weight: bold;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
}

.sidebar-nav ul li {
    margin-bottom: 5px;
}

.sidebar-nav ul li a {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.sidebar-nav ul li a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.sidebar-nav ul li a i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    margin-top: auto;
    padding: 20px;
}

/* Main Content Styles */
.main-content {
    flex: 1;
    margin-