:root {
            --primary: #0077FF;
            --primary-dark: #0057cc;
            --primary-light: #e6f0ff;
            --secondary: #6c757d;
            --light: #f8f9fa;
            --dark: #1a1a2e;
            --success: #10b981;
            --info: #0ea5e9;
            --warning: #fbbf24;
            --danger: #ef4444;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-600: #4b5563;
            --gray-800: #1f2937;
            --radius: 12px;
            --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            --card-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
            --gradient: linear-gradient(135deg, #0077FF, #00aaff);
        }

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

        body {
            background-color: #f5f9ff;
            color: var(--dark);
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 1rem 1rem;
        }

        header {
            text-align: center;
            margin-bottom: 3rem;
        }

        h1 {
            color: var(--dark);
            background: var(--gradient);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 0.5rem;
            font-weight: 800;
            font-size: 2.25rem;
        }

        .subtitle {
            color: var(--gray-600);
            font-size: 1.2rem;
            max-width: 600px;
            margin: 0 auto;
        }

        .main-content {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        @media (min-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
                margin: 0 auto;
            }
        }

        .card {
            background-color: white;
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--card-shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        .card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }

        .upload-container {
            text-align: center;
        }

        .upload-area {
            border: 2px dashed var(--gray-300);
            border-radius: var(--radius);
            padding: 2rem;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 1.5rem;
            position: relative;
            height: 350px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .upload-default-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            width: 100%;
            height: 100%;
            transition: opacity 0.3s ease;
        }

        .upload-preview {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: none;
            align-items: center;
            justify-content: center;
            background-color: rgba(255, 255, 255, 0.9);
        }

        .upload-preview.show {
            display: flex;
        }

        .close-preview {
            position: absolute;
            top: 10px;
            right: 10px;
            width: 30px;
            height: 30px;
            background-color: rgba(0, 0, 0, 0.6);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 12px;
            z-index: 10;
            transition: all 0.2s ease;
        }

        .close-preview:hover {
            background-color: rgba(0, 0, 0, 0.8);
            transform: scale(1.1);
        }

        .upload-buttons {
            display: flex;
            gap: 1rem;
            margin-top: 1rem;
        }

        .upload-area:hover {
            border-color: var(--primary);
            background-color: rgba(58, 134, 255, 0.05);
        }

        .upload-area.active {
            border-color: var(--primary);
            background-color: rgba(58, 134, 255, 0.1);
        }

        .upload-icon {
            font-size: 3.5rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }

        .upload-text {
            margin-bottom: 1.5rem;
            color: var(--gray-600);
            font-size: 1.1rem;
        }

        .btn {
            background: var(--gradient);
            color: white;
            border: none;
            padding: 0.85rem 2rem;
            border-radius: 30px;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            box-shadow: 0 4px 10px rgba(0, 119, 255, 0.2);
            position: relative;
        }

        .btn-icon {
            font-style: normal;
            font-size: 1.2rem;
        }

        .btn-download {
            background: linear-gradient(135deg, #4CAF50, #8BC34A);
            box-shadow: 0 4px 10px rgba(76, 175, 80, 0.2);
        }

        .btn-download:hover {
            background: linear-gradient(135deg, #388E3C, #689F38);
            box-shadow: 0 6px 15px rgba(76, 175, 80, 0.3);
        }

        .analyze-btn {
            min-width: 160px;
        }

        .btn-loader {
            display: none;
            width: 20px;
            height: 20px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-top: 2px solid white;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            position: absolute;
            right: 15px;
            margin-left: 10px;
        }

        .btn-loader.show {
            display: block;
        }

        .btn-secondary {
            background: var(--light);
            color: var(--dark);
            border: 1px solid var(--gray-300);
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
        }

        .btn:hover {
            background: linear-gradient(135deg, #0062d3, #0096e2);
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(0, 119, 255, 0.3);
        }

        .btn:disabled {
            background: linear-gradient(135deg, #9E9E9E, #BDBDBD);
            cursor: not-allowed;
            transform: none;
            box-shadow: 0 4px 10px rgba(158, 158, 158, 0.2);
        }

        .image-preview {
            max-width: 90%;
            max-height: 90%;
            border-radius: var(--radius);
            object-fit: contain;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        .button-group {
            display: flex;
            gap: 1rem;
            justify-content: center;
            margin-top: 1.5rem;
        }

        .results-container {
            height: 100%;
            display: none;
        }

        .results-container.show {
            display: block;
        }

        .results-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            border-bottom: 2px solid var(--primary-light);
            padding-bottom: 0.75rem;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .results-actions {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .result-title {
            color: var(--dark);
            font-weight: 700;
            font-size: 1.6rem;
            margin: 0;
        }

        /* Food header with image */
        .food-header {
            display: flex;
            gap: 1.5rem;
            margin-bottom: 2rem;
            align-items: center;
        }

        .food-image-container {
            width: 120px;
            height: 120px;
            overflow: hidden;
            border-radius: var(--radius);
            flex-shrink: 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            border: 3px solid white;
            outline: 1px solid var(--gray-200);
        }

        .food-result-image {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .food-info {
            flex: 1;
        }

        .nutrition-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        }

        .nutrition-table th {
            background-color: var(--primary);
            color: white;
            text-align: left;
            padding: 1rem;
            font-weight: 600;
        }

        .nutrition-table td {
            padding: 1rem;
            border-bottom: 1px solid var(--gray-200);
        }

        .nutrition-table tr:last-child td {
            border-bottom: none;
        }

        .nutrition-table tr:nth-child(even) {
            background-color: var(--primary-light);
        }

        .food-name {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--dark);
        }

        .food-description {
            color: var(--gray-600);
            font-size: 1.05rem;
            margin-bottom: 1rem;
        }

        .macro-chart {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
            margin: 1.5rem 0;
            background: white;
            padding: 1.5rem;
            border-radius: var(--radius);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
        }

        .macro-item {
            text-align: center;
            background: var(--primary-light);
            padding: 1rem;
            border-radius: var(--radius);
            transition: transform 0.3s ease;
        }

        .macro-item:hover {
            transform: translateY(-5px);
        }

        .macro-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 0.5rem;
        }

        .macro-label {
            font-size: 0.9rem;
            color: var(--gray-600);
            font-weight: 500;
        }

        .health-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 0.4rem 1rem;
            border-radius: 20px;
            font-size: 0.85rem;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
            font-weight: 600;
            transition: all 0.3s ease;
            border: 1px solid rgba(0, 119, 255, 0.2);
        }

        .health-tag:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-2px);
        }

        .health-tags {
            margin: 1.5rem 0;
        }

        /* Recipe section styles */
        .recipe-section {
            margin-top: 2rem;
            padding: 1.5rem;
            background: var(--primary-light);
            border-radius: var(--radius);
            border-left: 4px solid var(--primary);
        }

        .recipe-title {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 1rem;
        }

        .recipe-text {
            font-size: 1rem;
            line-height: 1.7;
            color: var(--gray-800);
            white-space: pre-line;
        }

        /* Reset button styles */
        .reset-btn {
            background-color: white;
            color: var(--gray-600);
            border: 1px solid var(--gray-300);
            padding: 0.85rem 2rem;
            border-radius: 30px;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .reset-btn:hover {
            background-color: var(--gray-100);
            color: var(--gray-800);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        /* Loading spinner */
        .loader {
            display: none;
            width: 40px;
            height: 40px;
            border: 4px solid var(--primary-light);
            border-top: 4px solid var(--primary);
            border-radius: 50%;
            margin: 2rem auto;
            animation: spin 1s linear infinite;
        }

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

        .error-message {
            color: var(--danger);
            margin-top: 1rem;
            display: none;
            padding: 0.75rem;
            background-color: rgba(239, 68, 68, 0.1);
            border-radius: var(--radius);
            font-weight: 500;
        }

        /* File input styling */
        input[type="file"] {
            display: none;
        }

        footer {
            text-align: center;
            margin-top: 3rem;
            color: var(--gray-600);
            padding: 1.5rem 0;
            border-top: 1px solid var(--gray-200);
        }

        /* Features section */
        .features-section {
            margin: 4rem 0;
            text-align: center;
        }

        .features-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--gray-800);
            margin-bottom: 2rem;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }

        .feature-card {
            background-color: white;
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: transform 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-5px);
        }

        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }

        .feature-title {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--gray-800);
        }

        .feature-desc {
            color: var(--gray-600);
            font-size: 0.95rem;
        }

        /* How it works section */
        .how-it-works {
            margin: 4rem 0;
        }

        .how-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--gray-800);
            margin-bottom: 2rem;
            text-align: center;
        }

        .steps {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        @media (min-width: 768px) {
            .steps {
                flex-direction: row;
            }
        }

        .step {
            flex: 1;
            position: relative;
            padding: 1.5rem;
            background-color: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }

        .step-number {
            position: absolute;
            top: -15px;
            left: -15px;
            background-color: var(--primary);
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .step-title {
            margin-bottom: 1rem;
            font-weight: 600;
            color: var(--gray-800);
        }

        .step-desc {
            color: var(--gray-600);
            font-size: 0.95rem;
        }

        /* FAQ Section */
        .faq-section {
            margin: 4rem 0;
        }

        .faq-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--gray-800);
            margin-bottom: 2rem;
            text-align: center;
        }

        .faq-item {
            background-color: white;
            border-radius: var(--radius);
            padding: 1.5rem;
            margin-bottom: 1rem;
            box-shadow: var(--shadow);
        }

        .faq-question {
            font-weight: 600;
            color: var(--gray-800);
            margin-bottom: 0.75rem;
            font-size: 1.1rem;
        }

        .faq-answer {
            color: var(--gray-600);
        }

        /* Site Header */
        .site-header {
            background: var(--gradient);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .logo-icon {
            font-size: 1.8rem;
        }

        .logo-text {
            font-weight: 800;
            font-size: 1.5rem;
            letter-spacing: -0.5px;
        }

        .header-tagline {
            font-size: 1rem;
            font-weight: 500;
            opacity: 0.9;
        }

        @media (max-width: 480px) {
            .header-tagline {
                display: none;
            }
        }
        
        /* Responsive styles */
        @media (max-width: 768px) {
            h1 {
                font-size: 1rem;
            }
            
            .subtitle {
                font-size: 1rem;
            }
            
            .main-content {
                gap: 1.5rem;
            }
            
            .card {
                padding: 1.5rem;
            }
            
            .upload-area {
                height: 300px;
                padding: 1rem;
            }
            
            .btn {
                padding: 0.75rem 1.5rem;
                font-size: 0.95rem;
            }
            
            .food-header {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            
            .food-image-container {
                margin-bottom: 1rem;
            }
            
            .macro-chart {
                grid-template-columns: repeat(2, 1fr);
                gap: 0.75rem;
            }
            
            .results-header {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            
            .results-actions {
                margin-top: 1rem;
                justify-content: center;
            }
        }
        
        @media (max-width: 480px) {
            .upload-buttons {
                flex-direction: column;
                gap: 0.75rem;
            }
            
            .btn {
                width: 100%;
            }
            
            .result-title {
                font-size: 1.4rem;
            }
            
            .food-name {
                font-size: 1.4rem;
            }
            
            .nutrition-table th,
            .nutrition-table td {
                padding: 0.75rem;
            }
        }

        .analyze-btn span {
            margin-right: 0;
        }

        /* Show margin only when loader is active */
        .btn-loader.show {
            display: block;
        }

        .btn-loader.show ~ span {
            margin-right: 30px;
        }