* { 
            margin: 0; 
            padding: 0; 
            box-sizing: border-box; 
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            overflow-x: hidden;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: #333;
            font-family: Arial, sans-serif;
            transition: background 0.3s ease;
        }    
        
        body.dark-mode {
            background: #121212;
            color: #f4f4f9;
        }

        .app-container {
            position: relative;
            min-height: 100vh;
            transition: transform 0.3s ease;
        }

        /* Header Styles */
        .header {
            background: linear-gradient(135deg, #6e8efb, #a777e3);
            color: white;
            width: 100%;
            height: 4rem;
            padding: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 0.13rem 0.63rem rgba(0, 0, 0, 0.1);
            position: fixed;
            margin-bottom: 1rem;
            z-index: 10;
        }

        body.dark-mode .header {
            background: linear-gradient(135deg, #4a5bbf, #7d5ab8);
        }

        /* Distinct menu button styles */
        .menu-btn {
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0.5rem;
            width: auto;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0;
            border-radius: 0;
            box-shadow: none;
            position: relative;
            z-index: 100;
            transition: none;
        }

        .menu-btn:hover {
            background: none;
            transform: none;
            box-shadow: none;
        }

        .menu-btn::after {
            content: none;
        }

        .app-title {
            margin: 0;
            font-weight: 600;
            font-size: 1.2rem;
            flex-grow: 1;
            text-align: center;
            position: relative;
        }

        /* Side Menu Styles */
        .side-menu {
            position: fixed;
            top: 0;
            left: -17.5rem;
            width: 12.5rem;
            height: 100%;
            background: white;
            box-shadow: 0.13rem 0 0.94rem rgba(0, 0, 0, 0.1);
            z-index: 100;
            transition: left 0.2s ease-in-out, background 0.2s ease-in-out;
            display: flex;
            flex-direction: column;
        }

        body.dark-mode .side-menu {
            background: #1e1e1e;
            color: #f4f4f9;
        }

        .side-menu.open {
            left: 0;
        }

        .menu-header {
            background: linear-gradient(135deg, #6e8efb, #a777e3);
            padding: 1.25rem;
            color: white;
            display: flex;
            align-items: center;
            margin-bottom: 1.25rem;
        }
        body.dark-mode .menu-header {
            background: linear-gradient(135deg, #4a5bbf, #7d5ab8);
        }

        .menu-header img {
            width: 3.13rem;
            height: 3.13rem;
            border-radius: 50%;
            margin-right: 0.93rem;
            object-fit: cover;
            border: 0.13rem solid white;
        }

        .user-info h3 {
            font-size: 1rem;
            margin-bottom: 5px;
        }

        .user-info p {
            font-size: 0.88rem;
            opacity: 0.8;
        }

        .menu-items {
            flex: 1;
            overflow-y: auto;
        }

        .menu-item {
            padding: 0.94rem 1.55rem;
            display: flex;
            align-items: center;
            color: #555;
            text-decoration: none;
            transition: all 0.2s;
        }

        body.dark-mode .menu-item {
            color: #ccc;
        }

        .menu-item:hover {
            background-color: #f0f0f0;
            color: #6e8efb;
        }

        body.dark-mode .menu-item:hover {
            background-color: #333;
            color: #8da1ff;
        }

        .menu-item.active {
            background-color: #e6e9ff;
            color: #6e8efb;
            border-left: 0.25rem solid #6e8efb;
        }

        body.dark-mode .menu-item.active {
            background-color: #2a2a4a;
            color: #8da1ff;
            border-left: 0.25rem solid #8da1ff;
        }

        .menu-item i {
            margin-right: 0.94rem;
            font-size: 1.25rem;
        }

        .menu-footer {
            padding: 0.94rem;
            border-top: 0.06rem solid #eee;
            text-align: center;
            font-size: 0.75rem;
            color: #999;
        }

        body.dark-mode .menu-footer {
            border-top: 0.06rem solid #444;
            color: #777;
        }

        /* Overlay */
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 50;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.2s ease-in-out;
        }

        .overlay.active {
            opacity: 1;
            pointer-events: all;
        }

        /* Main Content */
        .main-content {
            padding: 5rem 0.1rem 1rem;
            min-height: calc(100vh - 3.75rem);
            display: flex;
            justify-content: center;
            align-items: center;
        }

        /* Dark Mode Toggle Button - Protected from other button styles */
        .mode-toggle {
            position: fixed;
            top: 1.0rem;
            right: 1.25rem;
            width: 1.88rem;
            height: 1.88rem;
            z-index: 100;
            border-radius: 50%;
            background-color: #333;
            color: #fff;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0.13rem 0.31rem rgba(0, 0, 0, 0.2);
            transition: background-color 0.3s, transform 0.3s;
        }

        .mode-toggle.light {
            background-color: #f4f4f9;
            color: #333;
        }

        .mode-toggle:hover {
            transform: scale(1.1);
        }

        @media (max-width: 30rem) {
            .side-menu {
                width: 15.63rem;
                left: -15.63rem;
            }

            .header { 
                height: 2.5rem; 
                padding: 0.5rem; 
            } 
            .app-title { 
                font-size: 1rem; 
                text-align: center; 
            }
        }

        :root {
            --glass: rgba(255, 255, 255, 0.1);
            --glass-dark: rgba(30, 30, 30, 0.8);
            --border: 1px solid rgba(255, 255, 255, 0.2);
            --border-dark: 1px solid rgba(255, 255, 255, 0.1);
            --shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
            --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.5);
            --primary: #667eea;
            --secondary: #764ba2;
        }

         .form-container { 
            width: 100%; 
            max-width: 600px; 
            background: var(--glass); 
            backdrop-filter: blur(10px); 
            -webkit-backdrop-filter: blur(10px); 
            border-radius: 20px;            
            border: var(--border); 
            box-shadow: var(--shadow); 
            padding: 40px; 
            animation: fadeIn 0.8s ease-out, float 6s ease-in-out infinite alternate; 
            transform-style: preserve-3d; 
            transition: all var(--transition-speed) ease; 
        } 

        body.dark-mode .form-container {
            background: var(--glass-dark);
            border: var(--border-dark);
            box-shadow: var(--shadow-dark);
        }

        .form-container:hover { 
            transform: translateY(-5px) scale(1.005); 
            box-shadow: 0 12px 40px rgba(31, 38, 135, 0.5); 
        } 

        body.dark-mode .form-container:hover {
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.7);
        }

        h1 { 
            color: white;
            text-align: center; 
            margin-bottom: 30px; 
            font-weight: 600; 
            font-size: 2.0rem; 
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2); 
        } 

        body.dark-mode h1 {
            color: #f4f4f9;
        }

        .form-group { 
            margin-bottom: 25px; 
            position: relative; 
            animation: slideUp 0.6s ease-out; 
            animation-fill-mode: backwards; 
        } 
        .form-group:nth-child(1) { 
            animation-delay: 0.2s; 
        } 
        .form-group:nth-child(2) { 
            animation-delay: 0.3s; 
        } 
        .form-group:nth-child(3) { 
            animation-delay: 0.4s; 
        } 
        .form-group:nth-child(4) { 
            animation-delay: 0.5s; 
        } 
        .form-group:nth-child(5) { 
            animation-delay: 0.6s; 
        } 
        label { 
            display: block; 
            margin-bottom: 8px; 
            font-weight: 500; 
            font-size: 0.95rem; 
            color: rgba(255, 255, 255, 0.9); 
        } 

        body.dark-mode label {
            color: rgba(255, 255, 255, 0.8);
        }

        input, select, textarea { 
            width: 100%; 
            padding: 15px 20px; 
            background: rgba(255, 255, 255, 0.2); 
            border: var(--border); 
            border-radius: 12px; 
            font-size: 1rem; 
            color: white; 
            transition: all 0.3s ease; 
            backdrop-filter: blur(5px);
            -webkit-backdrop-filter: blur(5px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            outline: none; 
        } 

        body.dark-mode input,
        body.dark-mode select,
        body.dark-mode textarea {
            background: rgba(30, 30, 30, 0.5);
            border: var(--border-dark);
            color: #f4f4f9;
        }
        
           input:focus, select:focus { 
            background: rgba(255, 255, 255, 0.15); 
            border-color: rgba(255, 255, 255, 0.4); 
            box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1); 
        } 

        body.dark-mode input:focus,
        body.dark-mode select:focus {
            background: rgba(40, 40, 40, 0.7);
            border-color: rgba(255, 255, 255, 0.2);
            box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.05);
        }

        input::placeholder { 
            color: rgba(255, 255, 255, 0.6); 
        } 
        select option { 
            background: rgba(106, 90, 205, 0.9); 
            color: white; 
        } 
        button:not(.menu-btn):not(.mode-toggle) { 
            width: 100%; 
            padding: 16px; 
            background: linear-gradient(to right, var(--primary), var(--secondary)); 
            border: none; 
            border-radius: 12px; 
            color: white; 
            font-size: 1.1rem; 
            font-weight: 500; 
            cursor: pointer; 
            transition: all 0.4s ease; 
            margin-top: 10px; 
            box-shadow: 0 4px 15px rgba(106, 90, 205, 0.4); 
            overflow: hidden; 
            text-transform: uppercase;
            position: relative; 
        } 
        button:not(.menu-btn):not(.mode-toggle):hover { 
            transform: translateY(-3px); 
            box-shadow: 0 8px 25px rgba(106, 90, 205, 0.6); 
        } 
        button:not(.menu-btn):not(.mode-toggle):active { 
            transform: translateY(1px); 
        } 
        button:not(.menu-btn):not(.mode-toggle)::after { 
            content: ''; 
            position: absolute; 
            top: -50%; 
            left: -60%; 
            width: 200%; 
            height: 200%; 
            background: linear-gradient( 
                to right, 
                rgba(255, 255, 255, 0.13) 0%, 
                rgba(255, 255, 255, 0.13) 77%, 
                rgba(255, 255, 255, 0.5) 92%, 
                rgba(255, 255, 255, 0.0) 100% 
            ); 
            transform: rotate(30deg); 
            transition: all 0.7s ease; 
        } 
        button:not(.menu-btn):not(.mode-toggle):hover::after { 
            left: 100%; 
        } 
        .success-message {
            display: none;
            text-align: center;
            color: white;
            padding: 20px;
            background: rgba(76, 175, 80, 0.7);
            border-radius: 10px;
            margin-top: 20px;
            animation: fadeIn 0.5s ease-out;
        }

        .error-message {
            display: none;
            text-align: center;
            color: white;
            padding: 20px;
            background: rgba(244, 67, 54, 0.7);
            border-radius: 10px;
            margin-top: 20px;
            animation: fadeIn 0.5s ease-out;
        }

        .spinner {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255,255,255,.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
        }

        body.dark-mode .success-message, 
        body.dark-mode .error-message {
            background: rgba(46, 204, 113, 0.1);
            border: 1px solid rgba(46, 204, 113, 0.3);
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes float {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-15px); }
            100% { transform: translateY(0px); }
        }
        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        @media (max-width: 768px) { 
            .form-container { 
                padding: 30px; 
            } 

            input, select, textarea {
                padding: 12px 15px;
             }
          
            h1 { 
                font-size: 1.8rem; 
            } 
       }