* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* Promo Banner */
        .promo-banner {
            background: linear-gradient(90deg, #ff6b6b 0%, #ff8e53 100%);
            color: white;
            text-align: center;
            padding: 12px 0;
            font-weight: 600;
            font-size: 15px;
        }
        
        /* Header */
        header {
            background-color: white;
            border-bottom: 1px solid #eaeaea;
            padding: 15px 0;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 22px;
            font-weight: 700;
            color: #2d3436;
            display: flex;
            align-items: center;
        }
        
        .logo i {
            color: #4dabf7;
            margin-right: 8px;
            font-size: 24px;
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 25px;
        }
        
        .nav-links a {
            text-decoration: none;
            color: #555;
            font-weight: 500;
            font-size: 15px;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: #4dabf7;
        }
        
        .user-menu {
            display: flex;
            align-items: center;
        }
        
        .user-menu a {
            color: #555;
            text-decoration: none;
            margin-left: 20px;
            font-size: 15px;
        }
        
        .login-btn {
            color: #4dabf7 !important;
        }
        
        .signup-btn {
            background-color: #4dabf7;
            color: white !important;
            padding: 8px 16px;
            border-radius: 4px;
            font-weight: 500;
        }
        
        /* Courses Sidebar */
        .main-layout {
            display: grid;
            grid-template-columns: 220px 1fr;
            gap: 30px;
            margin: 30px 0 50px;
        }
        
        .courses-sidebar {
            background-color: white;
            border-radius: 8px;
            padding: 20px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            height: fit-content;
        }
        
        .courses-sidebar h3 {
            font-size: 16px;
            margin-bottom: 20px;
            color: #2d3436;
            font-weight: 600;
        }
        
        .course-list {
            list-style: none;
        }
        
        .course-list li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px solid #f1f3f4;
        }
        
        .course-list a {
            text-decoration: none;
            color: #555;
            display: flex;
            align-items: center;
            font-size: 14px;
        }
        
        .course-list a:hover {
            color: #4dabf7;
        }
        
        .course-list i {
            margin-right: 10px;
            width: 20px;
            color: #777;
        }
        
        .course-list .ielts {
            color: #4dabf7;
            font-weight: 600;
        }
        
        /* Main Content */
        .main-content {
            background-color: white;
            border-radius: 8px;
            padding: 30px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        
        .page-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 15px;
            color: #2d3436;
        }
        
        .page-subtitle {
            font-size: 16px;
            color: #666;
            margin-bottom: 25px;
            line-height: 1.7;
        }
        
        .subtitle-link {
            color: #4dabf7;
            text-decoration: none;
        }
        
        .subtitle-link:hover {
            text-decoration: underline;
        }
        
        .explore-link {
            display: inline-block;
            background-color: #f8f9fa;
            color: #4dabf7;
            padding: 8px 15px;
            border-radius: 4px;
            text-decoration: none;
            font-size: 14px;
            margin-bottom: 30px;
            border: 1px solid #eaeaea;
        }
        
        .explore-link:hover {
            background-color: #f1f3f4;
        }
        
        /* Form Sections */
        .form-section {
            margin-bottom: 30px;
        }
        
        .form-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
        }
        
        .form-label {
            font-size: 16px;
            font-weight: 600;
            color: #2d3436;
        }
        
        .randomize-btn {
            background-color: #f8f9fa;
            border: 1px solid #ddd;
            padding: 6px 12px;
            border-radius: 4px;
            font-size: 13px;
            color: #555;
            cursor: pointer;
            display: flex;
            align-items: center;
        }
        
        .randomize-btn i {
            margin-right: 5px;
        }
        
        .randomize-btn:hover {
            background-color: #f1f3f4;
        }
        
        .topic-input {
            width: 100%;
            padding: 14px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 15px;
            color: #333;
        }
        
        .topic-input::placeholder {
            color: #999;
        }
        
        /* Image Upload Section */
        .image-upload-section {
            border: 2px dashed #ddd;
            border-radius: 8px;
            padding: 25px;
            text-align: center;
            background-color: #fafbfc;
            margin-top: 10px;
        }
        
        .file-input-wrapper {
            position: relative;
            display: inline-block;
            margin-bottom: 15px;
        }
        
        .file-input {
            position: absolute;
            left: 0;
            top: 0;
            opacity: 0;
            width: 100%;
            height: 100%;
            cursor: pointer;
        }
        
        .file-btn {
            display: inline-block;
            background-color: #4dabf7;
            color: white;
            padding: 10px 20px;
            border-radius: 4px;
            font-weight: 500;
            cursor: pointer;
        }
        
        .file-name {
            display: block;
            margin-top: 10px;
            color: #777;
            font-size: 14px;
        }
        
        .upload-note {
            font-size: 13px;
            color: #888;
            line-height: 1.5;
            max-width: 500px;
            margin: 0 auto;
        }
        
        /* Report Section */
        .report-section {
            margin-top: 30px;
        }
        
        .score-display {
            background-color: #f8f9fa;
            border-radius: 8px;
            padding: 25px;
            text-align: center;
            margin-bottom: 25px;
        }
        
        .score-label {
            font-size: 14px;
            color: #777;
            margin-bottom: 5px;
        }
        
        .score-value {
            font-size: 48px;
            font-weight: 700;
            color: #2d3436;
        }
        
        .score-details {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 30px;
        }
        
        .detail-box {
            background-color: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
        }
        
        .detail-label {
            font-size: 14px;
            color: #777;
            margin-bottom: 10px;
        }
        
        .detail-value {
            font-size: 24px;
            font-weight: 600;
            color: #2d3436;
        }
        
        .detail-value.na {
            color: #bbb;
        }
        
        /* Textarea */
        .report-textarea {
            width: 100%;
            min-height: 300px;
            padding: 20px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 15px;
            line-height: 1.6;
            resize: vertical;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        .report-textarea::placeholder {
            color: #999;
        }
        
        /* Check Button */
        .check-button {
            display: block;
            width: 100%;
            background: linear-gradient(90deg, #4dabf7 0%, #339af0 100%);
            color: white;
            border: none;
            padding: 16px;
            border-radius: 8px;
            font-size: 17px;
            font-weight: 600;
            cursor: pointer;
            margin-top: 25px;
            transition: all 0.3s;
        }
        
        .check-button:hover {
            background: linear-gradient(90deg, #339af0 0%, #228be6 100%);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
        }
        
        /* Footer */
        footer {
            background-color: white;
            border-top: 1px solid #eaeaea;
            padding: 40px 0;
            margin-top: 50px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
        }
        
        .footer-column h4 {
            font-size: 16px;
            margin-bottom: 20px;
            color: #2d3436;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #666;
            text-decoration: none;
            font-size: 14px;
        }
        
        .footer-links a:hover {
            color: #4dabf7;
        }
        
        .copyright {
            text-align: center;
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid #eee;
            color: #888;
            font-size: 14px;
        }
        
        /* Responsive */
        @media (max-width: 992px) {
            .main-layout {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
            }
            
            .nav-links {
                margin-top: 15px;
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .nav-links li {
                margin: 5px 10px;
            }
            
            .user-menu {
                margin-top: 15px;
            }
            
            .score-details {
                grid-template-columns: 1fr;
            }
            
            .page-title {
                font-size: 24px;
            }
        }