:root {
            --primary-color: #4361ee;
            --secondary-color: #3f37c9;
            --accent-color: #4895ef;
            --dark-color: #1a1a2e;
            --light-color: #f8f9fa;
            --success-color: #4cc9f0;
            --border-radius: 12px;
            --box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            background-color: #f5f7ff;
            color: var(--dark-color);
            line-height: 1.6;
        }
        
        /* Navigation */
        .navbar {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            padding: 1rem 0;
        }
        
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color);
            font-size: 1.5rem;
        }
        
        .nav-link {
            font-weight: 500;
            color: var(--dark-color);
            margin: 0 0.5rem;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        
        .nav-link:hover, .nav-link:focus {
            color: var(--primary-color);
            background-color: rgba(67, 97, 238, 0.1);
        }
        
        /* Hero Section */
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 5rem 0;
            margin-bottom: 0rem;
            position: relative;
            overflow: hidden;
        }
        
        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
            transform: rotate(30deg);
        }
        
        .hero-title {
            font-weight: 800;
            font-size: 3rem;
            margin-bottom: 1.5rem;
            position: relative;
        }
        
        .hero-lead {
            font-size: 1.25rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 2rem;
            position: relative;
        }
        
        /* Tool Container */
        .tool-container {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 2.5rem;
            margin-bottom: 4rem;
            border: 1px solid rgba(0,0,0,0.05);
        }
        
        .section-title {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 2rem;
            text-align: center;
            position: relative;
        }
        
        .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--accent-color);
            margin: 1rem auto;
            border-radius: 2px;
        }
        
        /* Upload Area */
        .upload-area {
            border: 2px dashed #d1d5db;
            border-radius: var(--border-radius);
            padding: 2rem;
            text-align: center;
            margin-bottom: 2rem;
            transition: var(--transition);
            background-color: #f9fafb;
            cursor: pointer;
        }
        
        .upload-area:hover {
            border-color: var(--accent-color);
            background-color: rgba(72, 149, 239, 0.05);
        }
        
        .upload-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        /* Controls */
        .control-card {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.03);
            border: 1px solid rgba(0,0,0,0.05);
        }
        
        .control-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--dark-color);
            display: flex;
            align-items: center;
        }
        
        .control-title i {
            margin-right: 0.5rem;
            color: var(--accent-color);
        }
        
        .dimension-inputs {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        
        .dimension-inputs .form-control {
            padding: 0.75rem 1rem;
            border-radius: 8px;
            border: 1px solid #e5e7eb;
            transition: var(--transition);
        }
        
        .dimension-inputs .form-control:focus {
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(72, 149, 239, 0.2);
        }
        
        .ratio-btn {
            border-radius: 8px;
            padding: 0.5rem 1rem;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid #e5e7eb;
        }
        
        .ratio-btn:hover, .ratio-btn.active {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        /* Cropper Container */
        #cropper-container {
            max-width: 100%;
            margin: 2rem auto;
            display: none;
        }
        
        #preview {
            width: 120px;
            height: 120px;
            overflow: hidden;
            margin: 1.5rem auto;
            border-radius: 8px;
            border: 1px solid #e5e7eb;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
        }
        
        /* Buttons */
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 1.5rem;
            font-weight: 600;
            border-radius: 8px;
            transition: var(--transition);
        }
        
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
        }
        
        .btn-outline-secondary {
            border-radius: 8px;
            padding: 0.75rem 1.5rem;
            font-weight: 600;
            transition: var(--transition);
        }
        
        .btn-outline-secondary:hover {
            background-color: #f3f4f6;
            transform: translateY(-2px);
        }
        
        /* How to Use Section */
        .how-to-step {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 2rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--box-shadow);
            border-left: 4px solid var(--accent-color);
            transition: var(--transition);
            height: 100%;
        }
        
        .how-to-step:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background-color: var(--accent-color);
            color: white;
            font-weight: 700;
            border-radius: 50%;
            margin-right: 1rem;
        }
        
        /* Features Section */
        .feature-card {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 2rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--box-shadow);
            text-align: center;
            transition: var(--transition);
            height: 100%;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        
        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        /* FAQ Section */
        .faq-item {
            margin-bottom: 1rem;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        
        .faq-header button {
            font-weight: 600;
            padding: 1.25rem;
            width: 100%;
            text-align: left;
            background-color: white;
            border: none;
            transition: var(--transition);
        }
        
        .faq-header button:hover {
            color: var(--primary-color);
        }
        
        .faq-header button:not(.collapsed) {
            color: var(--primary-color);
            background-color: rgba(67, 97, 238, 0.05);
        }
        
        .faq-body {
            padding: 1.25rem;
            background-color: white;
            border-top: 1px solid rgba(0,0,0,0.05);
        }
        
        /* About Section */
        .about-img {
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            transition: var(--transition);
        }
        
        .about-img:hover {
            transform: scale(1.02);
        }
        
        /* Future Section */
        .future-card {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
            border-top: 3px solid var(--accent-color);
        }
        
        .future-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        
        .future-icon {
            font-size: 1.5rem;
            color: var(--accent-color);
            margin-bottom: 1rem;
        }
        
        /* Footer */
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 4rem 0 2rem;
            position: relative;
        }
        
        footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
        }
        
        .footer-links h5 {
            font-weight: 600;
            margin-bottom: 1.5rem;
            position: relative;
            display: inline-block;
        }
        
        .footer-links h5::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -8px;
            width: 40px;
            height: 3px;
            background-color: var(--accent-color);
        }
        
        .footer-links ul li {
            margin-bottom: 0.75rem;
        }
        
        .footer-links a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            margin-right: 0.75rem;
            transition: var(--transition);
        }
        
        .social-icons a:hover {
            background-color: var(--accent-color);
            transform: translateY(-3px);
        }
        
        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.25rem;
            }
            
            .dimension-inputs {
                flex-direction: column;
            }
            
            .tool-container {
                padding: 1.5rem;
            }
        }