Improve login screen design and functionality

- Increased logo size from 60x60 to 120x120px with proper styling
- Enhanced card layout with better padding and rounded corners
- Added modern gradient background and improved visual hierarchy
- Improved form styling with larger inputs and better spacing
- Enhanced password visibility toggle with better UX
- Improved error message styling with icons and rounded corners
- Added responsive design improvements for better mobile experience
- Updated color scheme with modern gradients and improved contrast

static/css/custom.css

@@ -2,7 +2,72 @@
 
 /* Additional styles can be added here */
 body {
-    background-color: #f8f9fa;
+    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+    min-height: 100vh;
+    display: flex;
+    align-items: center;
+    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+}
+
+/* Login page specific styles */
+.container {
+    min-height: 100vh;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 20px;
+}
+
+/* Enhanced card styling for login */
+.card {
+    backdrop-filter: blur(10px);
+    background: rgba(255, 255, 255, 0.95);
+    border: 1px solid rgba(255, 255, 255, 0.2);
+}
+
+/* Logo styling */
+.card .card-body .text-center img {
+    border-radius: 50%;
+    background: white;
+    padding: 10px;
+    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
+}
+
+/* Input group styling */
+.input-group-lg .form-control {
+    border-radius: 8px !important;
+    border: 2px solid #e9ecef;
+    transition: all 0.3s ease;
+}
+
+.input-group-lg .form-control:focus {
+    border-color: #667eea;
+    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
+    background: white;
+}
+
+.input-group-text {
+    border-radius: 8px 0 0 8px !important;
+    border: 2px solid #e9ecef;
+    border-right: none;
+    background: #f8f9fa;
+}
+
+/* Button styling */
+.btn-primary {
+    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+    border: none;
+    border-radius: 8px;
+    padding: 12px 24px;
+    font-size: 16px;
+    font-weight: 600;
+    transition: all 0.3s ease;
+}
+
+.btn-primary:hover {
+    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
+    transform: translateY(-2px);
+    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
 }
 
 /* Custom navbar styles */