:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --secondary: #0ea5e9;
            --danger: #ef4444;
            --success: #10b981;
            --warning: #f59e0b;
            --light: #f8fafc;
            --dark: #1e293b;
            --darker: #0f172a;
            --gray: #64748b;
            --light-gray: #f1f5f9;
            --dark-gray: #475569;
            --card-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
            --card-shadow-hover: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
            --gradient: linear-gradient(135deg, var(--primary), #3b82f6);
            --nav-height: 70px;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            -webkit-tap-highlight-color: transparent;
        }
        
        body {
            font-family: 'Inter', sans-serif;
            line-height: 1.6;
            color: var(--dark);
            background: #ffffff;
            min-height: 100vh;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* Header */
        header {
            background: #ffffff;
            color: var(--dark);
            padding: 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
            border-bottom: 1px solid #e5e7eb;
            height: var(--nav-height);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            height: 100%;
        }
        
        .logo-container {
            display: flex;
            align-items: center;
            height: 100%;
            gap: 12px;
        }
        
        .logo-img {
            height: 36px;
        }
        
        .logo-text {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--primary);
        }
        
        /* Main Content */
        main {
            padding-top: calc(var(--nav-height) + 40px);
            min-height: calc(100vh - var(--nav-height));
        }
        
        /* Hero Section - Minimal */
        .hero {
            text-align: center;
            padding: 40px 0 30px;
            margin-bottom: 10px;
        }
        
        .hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--dark);
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -0.5px;
        }
        
        .hero-subtitle {
            font-size: 1.2rem;
            color: var(--gray);
            max-width: 600px;
            margin: 0 auto;
            font-weight: 400;
            line-height: 1.6;
        }
        
        /* Tool Interface */
        .tool-interface {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 60px;
        }
        
        @media (max-width: 968px) {
            .tool-interface {
                grid-template-columns: 1fr;
            }
        }
        
        /* Card Design */
        .card {
            background: #ffffff;
            border-radius: 12px;
            box-shadow: var(--card-shadow);
            padding: 30px;
            border: 1px solid #e5e7eb;
            position: relative;
        }
        
        .card-title {
            font-size: 1.3rem;
            color: var(--dark);
            margin-bottom: 20px;
            font-weight: 600;
            display: flex;
            align-items: center;
        }
        
        .card-title i {
            margin-right: 12px;
            font-size: 1.5rem;
            color: var(--primary);
        }
        
        /* Form Elements */
        .form-group {
            margin-bottom: 20px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--dark);
            font-size: 0.95rem;
        }
        
        textarea {
            width: 100%;
            padding: 16px;
            border: 1px solid #d1d5db;
            border-radius: 8px;
            font-size: 15px;
            transition: all 0.2s;
            background-color: white;
            font-family: 'Roboto Mono', monospace;
            min-height: 200px;
            resize: vertical;
        }
        
        textarea:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }
        
        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 600;
            transition: all 0.2s;
            text-align: center;
            margin-right: 10px;
            margin-bottom: 10px;
            font-family: 'Inter', sans-serif;
        }
        
        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
        }
        
        .btn-danger {
            background: var(--danger);
        }
        
        .btn-danger:hover {
            background: #dc2626;
        }
        
        .btn-success {
            background: var(--success);
        }
        
        .btn-success:hover {
            background: #059669;
        }
        
        .btn-group {
            display: flex;
            flex-wrap: wrap;
            margin-top: 20px;
        }
        
        /* Output Container */
        .output-container {
            position: relative;
        }
        
        .copy-float-btn {
            position: absolute;
            top: 10px;
            right: 10px;
            padding: 10px 16px;
            font-size: 0.85rem;
            z-index: 10;
        }
        
        /* Stats */
        .stats {
            display: flex;
            gap: 15px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        
        .stat-box {
            background-color: var(--primary-light);
            padding: 12px 16px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.9rem;
            font-weight: 500;
        }
        
        .stat-box i {
            color: var(--primary);
            font-size: 1.1rem;
        }
        
        /* Notification */
        .notification {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background-color: var(--success);
            color: white;
            padding: 14px 22px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.3s ease;
            z-index: 1000;
            font-weight: 500;
        }
        
        .notification.show {
            opacity: 1;
            transform: translateY(0);
        }
        
        /* Loader */
        .loader {
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top: 2px solid white;
            width: 16px;
            height: 16px;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        /* Information Sections */
        .info-section {
            margin-bottom: 60px;
        }
        
        .section-title {
            font-size: 1.8rem;
            color: var(--dark);
            margin-bottom: 25px;
            text-align: center;
            font-weight: 600;
        }
        
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--gray);
            margin-bottom: 40px;
            text-align: center;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.6;
        }
        
        /* Features */
        .features-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
            margin-bottom: 40px;
        }
        
        .feature-card {
            background: #ffffff;
            border-radius: 12px;
            box-shadow: var(--card-shadow);
            padding: 25px;
            transition: all 0.2s;
            text-align: center;
            border: 1px solid #e5e7eb;
        }
        
        .feature-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--card-shadow-hover);
        }
        
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 20px;
            background: var(--primary-light);
            width: 70px;
            height: 70px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            margin: 0 auto 20px;
        }
        
        .feature-title {
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--dark);
            font-size: 1.2rem;
        }
        
        .feature-desc {
            color: var(--gray);
            font-size: 0.95rem;
            line-height: 1.6;
        }
        
        /* How It Works */
        .how-it-works {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }
        
        .step-card {
            background: #ffffff;
            border-radius: 12px;
            box-shadow: var(--card-shadow);
            padding: 25px;
            text-align: center;
            border: 1px solid #e5e7eb;
            position: relative;
        }
        
        .step-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-light);
            position: absolute;
            top: 10px;
            right: 20px;
            opacity: 0.7;
        }
        
        .step-icon {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        .step-title {
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--dark);
            font-size: 1.2rem;
        }
        
        .step-desc {
            color: var(--gray);
            font-size: 0.95rem;
            line-height: 1.6;
        }
        
        /* About Tool */
        .about-tool {
            background: #ffffff;
            border-radius: 12px;
            box-shadow: var(--card-shadow);
            padding: 35px;
            margin-bottom: 40px;
            border: 1px solid #e5e7eb;
        }
        
        .about-content {
            max-width: 900px;
            margin: 0 auto;
        }
        
        .about-content h3 {
            font-size: 1.3rem;
            color: var(--dark);
            margin: 25px 0 15px;
            font-weight: 600;
        }
        
        .about-content p {
            margin-bottom: 16px;
            line-height: 1.7;
            color: var(--dark-gray);
        }
        
        .about-content ul {
            margin-bottom: 16px;
            padding-left: 20px;
        }
        
        .about-content li {
            margin-bottom: 8px;
            line-height: 1.6;
            color: var(--dark-gray);
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.2rem;
            }
            
            .hero-subtitle {
                font-size: 1rem;
            }
            
            .btn-group {
                justify-content: center;
            }
            
            .stats {
                justify-content: center;
            }
            
            .copy-float-btn {
                position: relative;
                top: auto;
                right: auto;
                margin-top: 15px;
                width: 100%;
            }
            
            .card {
                padding: 25px;
            }
            
            .section-title {
                font-size: 1.6rem;
            }
        }
        
        @media (max-width: 576px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            
            .btn-group .btn {
                width: 100%;
                margin-right: 0;
            }
            
            .stats {
                flex-direction: column;
            }
            
            .stat-box {
                width: 100%;
                justify-content: center;
            }
        }