* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background: #f8f9fa;
        }

        /* Top Bar */
        .top-bar {
            background: #2d3748;
            color: white;
            padding: 8px 0;
            font-size: 14px;
        }

        .top-bar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .contact-info {
            display: flex;
            gap: 20px;
        }

        .contact-info span {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .social-links {
            display: flex;
            gap: 10px;
        }

        .social-links a {
            color: white;
            text-decoration: none;
            padding: 5px;
            border-radius: 3px;
            transition: background 0.3s;
        }

        .social-links a:hover {
            background: rgba(255,255,255,0.1);
        }

        /* Header */
        .header {
            background: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            min-height: 70px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            color: #2d3748;
        }

        .logo-icon {
            font-size: 2rem;
        }

        .logo-text {
            font-size: 1.5rem;
            font-weight: bold;
        }

        .main-nav {
            display: flex;
            list-style: none;
            gap: 30px;
        }

        .main-nav a {
            text-decoration: none;
            color: #4a5568;
            font-weight: 600;
            padding: 10px 15px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .main-nav a:hover, .main-nav a.active {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
        }

        .mobile-menu-toggle {
            display: none;
            flex-direction: column;
            cursor: pointer;
            padding: 5px;
        }

        .mobile-menu-toggle span {
            width: 25px;
            height: 3px;
            background: #4a5568;
            margin: 3px 0;
            transition: 0.3s;
        }

        /* Hero Section with Breadcrumb */
        .tool-hero {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 40px 0 60px;
            text-align: center;
        }

        .breadcrumb {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 10px;
            margin-bottom: 30px;
            font-size: 14px;
            opacity: 0.9;
        }

        .breadcrumb a {
            color: white;
            text-decoration: none;
            transition: opacity 0.3s;
        }

        .breadcrumb a:hover {
            opacity: 0.7;
        }

        .breadcrumb span {
            font-weight: 600;
        }

        .tool-hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .hero-subtitle {
            font-size: 1.2rem;
            opacity: 0.95;
            max-width: 800px;
            margin: 0 auto 30px;
            line-height: 1.6;
        }

        .hero-features {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin-top: 30px;
        }

        .hero-feature {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1rem;
            opacity: 0.95;
        }

        .hero-feature span {
            color: #a7f3d0;
        }

        /* Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* About Section */
        .about-section {
            padding: 80px 0;
            background: white;
        }

        .about-content {
            max-width: 900px;
            margin: 0 auto;
            text-align: center;
        }

        .about-content h2 {
            font-size: 2.5rem;
            color: #2d3748;
            margin-bottom: 25px;
        }

        .about-content p {
            font-size: 1.1rem;
            color: #4a5568;
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .about-content .highlight {
            color: #667eea;
            font-weight: 600;
        }

        /* Key Features */
        .key-features {
            padding: 60px 0;
            background: #f8f9fa;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 50px;
        }

        .feature-card {
            background: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            text-align: center;
            transition: transform 0.3s ease;
        }

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

        .feature-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin: 0 auto 20px;
        }

        .feature-title {
            font-size: 1.3rem;
            color: #2d3748;
            margin-bottom: 10px;
        }

        .feature-description {
            color: #4a5568;
            line-height: 1.6;
        }

        /* Calculators Grid */
        .calculators-section {
            padding: 80px 0;
            background: white;
        }

        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-header h2 {
            font-size: 2.5rem;
            color: #2d3748;
            margin-bottom: 15px;
        }

        .section-header p {
            font-size: 1.2rem;
            color: #4a5568;
            max-width: 700px;
            margin: 0 auto;
        }

        .calculators-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 40px;
            margin-top: 50px;
        }

        .calculator-card-detailed {
            background: white;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .calculator-card-detailed:hover {
            transform: translateY(-10px);
            box-shadow: 0 25px 50px rgba(0,0,0,0.15);
        }

        .card-header {
            padding: 30px;
            color: white;
            position: relative;
        }

        .card-header-profit { background: linear-gradient(135deg, #667eea, #764ba2); }
        .card-header-gross { background: linear-gradient(135deg, #48bb78, #38a169); }
        .card-header-net { background: linear-gradient(135deg, #ed64a6, #d53f8c); }
        .card-header-markup { background: linear-gradient(135deg, #ed8936, #dd6b20); }
        .card-header-breakeven { background: linear-gradient(135deg, #805ad5, #6b46c1); }
        .card-header-roi { background: linear-gradient(135deg, #10b981, #059669); }

        .card-icon {
            font-size: 3rem;
            margin-bottom: 15px;
        }

        .card-title {
            font-size: 1.8rem;
            margin-bottom: 10px;
        }

        .card-subtitle {
            opacity: 0.9;
            font-size: 0.95rem;
        }

        .card-body {
            padding: 30px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

        .card-description {
            color: #4a5568;
            margin-bottom: 25px;
            line-height: 1.6;
        }

        .feature-list {
            list-style: none;
            margin-bottom: 30px;
            flex-grow: 1;
        }

        .feature-list li {
            padding: 8px 0;
            color: #4a5568;
            position: relative;
            padding-left: 25px;
        }

        .feature-list li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: #48bb78;
            font-weight: bold;
        }

        .card-actions {
            display: flex;
            gap: 15px;
        }

        .btn {
            padding: 12px 25px;
            border-radius: 25px;
            text-decoration: none;
            font-weight: 600;
            text-align: center;
            transition: all 0.3s ease;
            flex: 1;
        }

        .btn-primary {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
        }

        .btn-secondary {
            background: white;
            color: #667eea;
            border: 2px solid #667eea;
        }

        .btn-secondary:hover {
            background: #f8f9ff;
        }

        /* Why Use Section */
        .why-use-section {
            padding: 80px 0;
            background: #f8f9fa;
        }

        .why-use-content {
            max-width: 900px;
            margin: 0 auto;
        }

        .why-use-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-top: 50px;
        }

        .why-card {
            background: white;
            padding: 25px;
            border-radius: 10px;
            border-left: 4px solid #667eea;
        }

        .why-card h3 {
            color: #2d3748;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .why-card p {
            color: #4a5568;
            line-height: 1.6;
        }

        /* Comparison Table */
        .comparison-section {
            padding: 80px 0;
            background: white;
        }

        .comparison-table {
            background: white;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
        }

        .comparison-table table {
            width: 100%;
            border-collapse: collapse;
        }

        .comparison-table th {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            padding: 20px;
            text-align: left;
            font-weight: 600;
        }

        .comparison-table td {
            padding: 20px;
            border-bottom: 1px solid #e2e8f0;
        }

        .comparison-table tr:hover {
            background: #f8f9ff;
        }

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

        /* Supported Types */
        .supported-types {
            padding: 80px 0;
            background: #f8f9fa;
        }

        .types-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 50px;
        }

        .type-badge {
            background: white;
            padding: 15px 20px;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
        }

        .type-badge:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
        }

        .type-badge-icon {
            color: #667eea;
            font-size: 1.5rem;
            margin-bottom: 8px;
        }

        .type-badge-name {
            font-weight: 600;
            color: #2d3748;
        }

        /* How To Section */
        .how-to-section {
            padding: 80px 0;
            background: white;
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-top: 50px;
        }

        .step-card {
            text-align: center;
        }

        .step-number {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: bold;
            margin: 0 auto 20px;
        }

        .step-title {
            font-size: 1.3rem;
            color: #2d3748;
            margin-bottom: 10px;
        }

        .step-description {
            color: #4a5568;
            line-height: 1.6;
        }

        /* CTA Section */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            text-align: center;
        }

        .cta-content h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
        }

        .cta-content p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            opacity: 0.95;
        }

        .cta-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .cta-button {
            background: white;
            color: #667eea;
            padding: 15px 35px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: bold;
            font-size: 1.1rem;
            transition: all 0.3s ease;
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        }

        /* Footer */
        .footer {
            background: #2d3748;
            color: white;
            padding: 60px 0 20px;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-section h3 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }

        .footer-section p {
            color: #a0aec0;
            line-height: 1.6;
            margin-bottom: 15px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: #a0aec0;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: white;
        }

        .footer-bottom {
            border-top: 1px solid #4a5568;
            padding-top: 20px;
            text-align: center;
            color: #a0aec0;
        }

        /* Mobile Optimization */
        @media (max-width: 768px) {
            .top-bar-content {
                flex-direction: column;
                gap: 10px;
            }

            .contact-info {
                display: none;
            }

            .main-nav {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                gap: 0;
                box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            }

            .main-nav.active {
                display: flex;
            }

            .main-nav a {
                padding: 15px 20px;
                border-radius: 0;
                border-bottom: 1px solid #e2e8f0;
            }

            .mobile-menu-toggle {
                display: flex;
            }

            .tool-hero h1 {
                font-size: 2rem;
            }

            .hero-features {
                flex-direction: column;
                gap: 15px;
            }

            .calculators-grid {
                grid-template-columns: 1fr;
            }

            .comparison-table {
                overflow-x: auto;
            }

            .card-actions {
                flex-direction: column;
            }
        }

        /* Animation for mobile menu */
        .mobile-menu-toggle.active span:nth-child(1) {
            transform: rotate(-45deg) translate(-5px, 6px);
        }

        .mobile-menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .mobile-menu-toggle.active span:nth-child(3) {
            transform: rotate(45deg) translate(-5px, -6px);
        }