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

        :root {
            --primary: #4361ee;
            --primary-dark: #3a56d4;
            --secondary: #7209b7;
            --accent: #f72585;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --success: #4cc9f0;
            --warning: #f8961e;
            --danger: #f94144;
            --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            --radius: 12px;
            --transition: all 0.3s ease;
        }

        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            color: var(--dark);
            min-height: 100vh;
            padding: 20px;
            line-height: 1.6;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
        }

        /* Header Styles */
        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            margin-bottom: 30px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
        }

        .logo i {
            color: var(--accent);
        }

        .badge {
            background: var(--accent);
            color: white;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.7rem;
            font-weight: 600;
            margin-left: 10px;
        }

        .user-actions {
            display: flex;
            gap: 15px;
            align-items: center;
        }

        .btn {
            padding: 10px 20px;
            border-radius: var(--radius);
            border: none;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

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

        .btn-accent {
            background: var(--accent);
            color: white;
        }

        .btn-accent:hover {
            background: #e11575;
            transform: translateY(-2px);
        }

        /* Main Layout */
        .main-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 40px;
        }

        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }

        /* Input Card */
        .card {
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 30px;
            height: 100%;
        }

        .card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }

        .card-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--dark);
        }

        .card-subtitle {
            color: var(--gray);
            font-size: 0.9rem;
        }

        /* Text Area */
        .text-input-container {
            position: relative;
            margin-bottom: 25px;
        }

        .text-input {
            width: 100%;
            height: 300px;
            padding: 20px;
            border: 2px solid #eaeaea;
            border-radius: var(--radius);
            font-size: 1rem;
            resize: vertical;
            transition: var(--transition);
        }

        .text-input:focus {
            outline: none;
            border-color: var(--primary);
        }

        .word-count {
            position: absolute;
            bottom: 15px;
            right: 15px;
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 5px 10px;
            border-radius: 20px;
            font-size: 0.8rem;
        }

        /* File Upload */
        .upload-area {
            border: 2px dashed #ddd;
            border-radius: var(--radius);
            padding: 40px 20px;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            margin-bottom: 20px;
        }

        .upload-area:hover, .upload-area.active {
            border-color: var(--primary);
            background: rgba(67, 97, 238, 0.05);
        }

        .upload-area i {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 15px;
        }

        .upload-text {
            font-weight: 600;
            margin-bottom: 10px;
        }

        .upload-subtext {
            color: var(--gray);
            font-size: 0.9rem;
        }

        /* Settings */
        .settings {
            margin-top: 25px;
        }

        .settings-title {
            font-weight: 600;
            margin-bottom: 15px;
            color: var(--dark);
        }

        .setting-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid #f0f0f0;
        }

        .toggle-switch {
            position: relative;
            width: 50px;
            height: 26px;
        }

        .toggle-switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }

        .slider {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: #ccc;
            transition: .4s;
            border-radius: 34px;
        }

        .slider:before {
            position: absolute;
            content: "";
            height: 18px;
            width: 18px;
            left: 4px;
            bottom: 4px;
            background-color: white;
            transition: .4s;
            border-radius: 50%;
        }

        input:checked + .slider {
            background-color: var(--primary);
        }

        input:checked + .slider:before {
            transform: translateX(24px);
        }

        /* Results Card */
        .results-card {
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 30px;
            height: 100%;
        }

        .results-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
        }

        .results-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--dark);
        }

        .score-container {
            text-align: center;
            margin-bottom: 40px;
        }

        .score-circle {
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: conic-gradient(var(--success) 0% 85%, var(--warning) 85% 95%, var(--danger) 95% 100%);
            margin: 0 auto 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .score-inner {
            width: 140px;
            height: 140px;
            background: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
        }

        .score-value {
            font-size: 3rem;
            font-weight: 800;
            color: var(--dark);
        }

        .score-label {
            font-size: 1rem;
            color: var(--gray);
        }

        .results-details {
            margin-bottom: 30px;
        }

        .detail-item {
            display: flex;
            justify-content: space-between;
            padding: 15px 0;
            border-bottom: 1px solid #f0f0f0;
        }

        .detail-label {
            font-weight: 600;
        }

        .detail-value {
            color: var(--dark);
        }

        .plagiarism-highlights {
            margin-top: 30px;
        }

        .highlight-title {
            font-weight: 700;
            margin-bottom: 15px;
            color: var(--dark);
        }

        .highlighted-text {
            background: #fff9e6;
            padding: 20px;
            border-radius: var(--radius);
            border-left: 4px solid var(--warning);
            max-height: 200px;
            overflow-y: auto;
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .highlight {
            background-color: rgba(248, 150, 30, 0.3);
            padding: 2px 4px;
            border-radius: 3px;
        }

        .highlight.severe {
            background-color: rgba(249, 65, 68, 0.3);
        }

        .highlight.mild {
            background-color: rgba(76, 201, 240, 0.3);
        }

        /* Sources */
        .sources-list {
            margin-top: 30px;
        }

        .source-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px;
            background: #f8f9fa;
            border-radius: var(--radius);
            margin-bottom: 10px;
        }

        .source-url {
            font-weight: 600;
            color: var(--primary);
            text-decoration: none;
        }

        .source-url:hover {
            text-decoration: underline;
        }

        .source-similarity {
            color: var(--danger);
            font-weight: 600;
        }

        /* Premium Features */
        .premium-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin-top: 40px;
        }

        .feature-card {
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 25px;
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }

        .feature-icon {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            flex-shrink: 0;
        }

        .feature-content h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--dark);
        }

        .feature-content p {
            color: var(--gray);
            font-size: 0.95rem;
        }

        /* Footer */
        footer {
            text-align: center;
            padding: 30px 0;
            color: var(--gray);
            font-size: 0.9rem;
            border-top: 1px solid #eee;
            margin-top: 50px;
        }

        /* Loading Animation */
        .loading {
            display: none;
            text-align: center;
            padding: 40px;
        }

        .spinner {
            width: 60px;
            height: 60px;
            border: 5px solid rgba(67, 97, 238, 0.2);
            border-top: 5px solid var(--primary);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto 20px;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Responsive */
        @media (max-width: 768px) {
            header {
                flex-direction: column;
                gap: 20px;
                text-align: center;
            }
            
            .user-actions {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .card, .results-card {
                padding: 20px;
            }
            
            .score-circle {
                width: 150px;
                height: 150px;
            }
            
            .score-inner {
                width: 110px;
                height: 110px;
            }
            
            .score-value {
                font-size: 2.5rem;
            }
            
            .premium-features {
                grid-template-columns: 1fr;
            }
        }

        /* Toast Notification */
        .toast {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--dark);
            color: white;
            padding: 15px 25px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            display: flex;
            align-items: center;
            gap: 10px;
            z-index: 1000;
            transform: translateY(100px);
            opacity: 0;
            transition: var(--transition);
        }

        .toast.show {
            transform: translateY(0);
            opacity: 1;
        }

        .toast i {
            color: var(--success);
        }