:root {
            --primary-color: #6a0dad;
            --primary-dark: #4b0082;
            --primary-light: #9b59b6;
            --secondary-color: #f8f9fa;
            --text-color: #333;
            --light-gray: #e9ecef;
            --medium-gray: #ced4da;
            --dark-gray: #495057;
            --error-color: #e74c3c;
            --success-color: #2ecc71;
        }

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

        body {
            background-color: #f5f5f5;
            color: var(--text-color);
            line-height: 1.6;
        }

        /* Main Content Layout */
        .main-content {
            margin-left: 250px;
            padding: 2rem;
            min-height: 100vh;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        /* Card Styling */
        .card {
            background: white;
            border-radius: 10px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            margin-bottom: 2rem;
        }

        .header {
            background: var(--primary-color);
            color: white;
            padding: 1.5rem 2rem;
            border-bottom: 4px solid var(--primary-dark);
        }

        .header h2 {
            font-weight: 600;
            font-size: 1.8rem;
        }

        /* Form Container */
        .form-container {
            padding: 2rem;
        }

        /* Teacher Info Section */
        .teacher-info {
            display: flex;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid var(--light-gray);
        }

        .teacher-img {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            object-fit: cover;
            border: 3px solid var(--primary-light);
            margin-right: 1.5rem;
        }

        .teacher-details h3 {
            color: var(--primary-dark);
            margin-bottom: 0.5rem;
            font-size: 1.3rem;
        }

        .teacher-details p {
            color: var(--dark-gray);
            font-size: 0.95rem;
        }

        /* Form Grid Layout - 3 Columns */
        .form-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
            margin-bottom: 1.5rem;
        }

        /* Column Span Utilities */
        .form-group-span-2 {
            grid-column: span 2;
        }

        .form-group-span-3 {
            grid-column: span 3;
        }

        /* Responsive adjustments */
        @media (max-width: 1024px) {
            .form-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .form-group-span-2,
            .form-group-span-3 {
                grid-column: span 2;
            }
        }

        @media (max-width: 768px) {
            .form-grid {
                grid-template-columns: 1fr;
            }
            
            .form-group-span-2,
            .form-group-span-3 {
                grid-column: span 1;
            }
        }

        /* Form Group Styling */
        .form-group {
            margin-bottom: 1.25rem;
        }

        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: var(--dark-gray);
        }

        .form-group input[type="text"],
        .form-group input[type="date"],
        .form-group input[type="tel"],
        .form-group input[type="email"],
        .form-group input[type="password"],
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid var(--medium-gray);
            border-radius: 6px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(106, 13, 173, 0.1);
        }

        /* Radio Button Styling */
        .gender-options {
            display: flex;
            gap: 1.5rem;
            margin-top: 0.5rem;
            flex-wrap: wrap;
        }

        .gender-options label {
            display: flex;
            align-items: center;
            cursor: pointer;
            font-weight: normal;
        }

        .gender-options input[type="radio"] {
            margin-right: 0.5rem;
            accent-color: var(--primary-color);
        }

        /* Button Styling */
        .form-actions {
            text-align: right;
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--light-gray);
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
        }

        /* Message Styling */
        .message {
            padding: 1rem;
            border-radius: 6px;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .message.error {
            background-color: rgba(231, 76, 60, 0.1);
            color: var(--error-color);
            border-left: 4px solid var(--error-color);
        }

        /* Error Message Styling */
        small.error {
            color: var(--error-color);
            font-size: 0.85rem;
            margin-top: 0.5rem;
            display: block;
        }

        /* Required Field Indicator */
        label[required]::after {
            content: " *";
            color: var(--error-color);
        }

        /* Responsive Adjustments */
        @media (max-width: 992px) {
            .main-content {
                margin-left: 0;
                padding: 1rem;
            }
            
            .form-container {
                padding: 1.5rem;
            }
        }

        /* Profile Upload Styles */
        .profile-upload-container {
            margin-bottom: 1.5rem;
        }

        .profile-upload-wrapper {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }

        .profile-preview {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            object-fit: cover;
            border: 4px solid var(--primary-light);
            background-color: var(--light-gray);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            position: relative;
        }

        .profile-preview img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .profile-preview::before {
            content: "No Image";
            position: absolute;
            color: var(--dark-gray);
            font-size: 0.8rem;
            display: none;
        }

        .profile-preview:not(.has-image)::before {
            display: block;
        }

        .upload-controls {
            flex: 1;
        }

        .upload-btn {
            display: inline-block;
            background-color: var(--primary-light);
            color: white;
            padding: 0.6rem 1.2rem;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 0.9rem;
            font-weight: 500;
            margin-bottom: 0.5rem;
            text-align: center;
        }

        .upload-btn:hover {
            background-color: var(--primary-color);
        }

        .upload-btn input[type="file"] {
            display: none;
        }

        .file-info {
            font-size: 0.85rem;
            color: var(--dark-gray);
            margin-top: 0.5rem;
        }

        .file-requirements {
            font-size: 0.8rem;
            color: var(--medium-gray);
            margin-top: 0.5rem;
        }

        /* Drag and Drop Area */
        .drag-drop-area {
            border: 2px dashed var(--medium-gray);
            border-radius: 8px;
            padding: 1.5rem;
            text-align: center;
            margin-top: 1rem;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .drag-drop-area:hover,
        .drag-drop-area.dragover {
            border-color: var(--primary-color);
            background-color: rgba(106, 13, 173, 0.05);
        }

        .drag-drop-area i {
            font-size: 2rem;
            color: var(--primary-light);
            margin-bottom: 0.5rem;
            display: block;
        }

        .drag-drop-area p {
            margin-bottom: 0.5rem;
        }

        .drag-drop-area .small {
            font-size: 0.8rem;
            color: var(--medium-gray);
        }