:root {
            --bg-primary: #ffffff;
            --bg-secondary: #f6f6f6;
            --bg-dark: #111111;
            --text-primary: #111111;
            --text-secondary: #666666;
            --text-light: #999999;
            --border-color: #dddddd;
            --accent-color: #000000;
            --max-width: 1200px;
            --font-serif: "Playfair Display", Georgia, "Noto Serif CJK SC", serif;
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        }

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

        body {
            font-family: var(--font-sans);
            color: var(--text-primary);
            background-color: var(--bg-primary);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Container */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Monochrome aesthetic details */
        .section-title {
            font-family: var(--font-serif);
            font-size: 2.2rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 12px;
            display: inline-block;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
            margin-bottom: 48px;
            text-transform: uppercase;
            letter-spacing: 2px;
        }

        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

        section:nth-child(even) {
            background-color: var(--bg-secondary);
        }

        a {
            color: var(--text-primary);
            text-decoration: none;
            transition: all 0.3s ease;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 32px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            border: 2px solid var(--accent-color);
            background-color: transparent;
            color: var(--text-primary);
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 0.9rem;
        }

        .btn-primary {
            background-color: var(--accent-color);
            color: #ffffff;
        }

        .btn-primary:hover {
            background-color: transparent;
            color: var(--text-primary);
        }

        .btn-secondary:hover {
            background-color: var(--accent-color);
            color: #ffffff;
        }

        /* Header */
        header {
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            background: rgba(255, 255, 255, 0.95);
            z-index: 1000;
            backdrop-filter: blur(5px);
        }

        .nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .logo-area img {
            height: 40px;
            width: auto;
        }

        .nav-menu {
            display: flex;
            gap: 24px;
            list-style: none;
        }

        .nav-menu a {
            font-size: 0.85rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-secondary);
        }

        .nav-menu a:hover, .nav-menu a.active {
            color: var(--text-primary);
            border-bottom: 1px solid var(--accent-color);
            padding-bottom: 4px;
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 6px;
            cursor: pointer;
            background: none;
            border: none;
        }

        .menu-toggle span {
            display: block;
            width: 25px;
            height: 2px;
            background-color: var(--text-primary);
            transition: 0.3s;
        }

        /* Hero - No Images Allowed */
        .hero {
            padding: 120px 0;
            background-color: var(--bg-primary);
            text-align: center;
            border-bottom: 2px solid var(--text-primary);
        }

        .hero-inner {
            max-width: 800px;
            margin: 0 auto;
        }

        .hero h1 {
            font-family: var(--font-serif);
            font-size: 3.5rem;
            line-height: 1.15;
            font-weight: 800;
            margin-bottom: 24px;
            letter-spacing: -1px;
            color: var(--text-primary);
        }

        .hero p {
            font-size: 1.25rem;
            color: var(--text-secondary);
            margin-bottom: 40px;
            font-weight: 300;
            line-height: 1.8;
        }

        .hero-btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Grid Framework */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        /* Cards Style - Black & White Film Aesthetic */
        .card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 40px 30px;
            position: relative;
            transition: all 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
            border-color: var(--accent-color);
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .card-num {
            font-family: var(--font-serif);
            font-size: 3rem;
            font-weight: 700;
            color: #eaeaea;
            position: absolute;
            top: 20px;
            right: 30px;
            line-height: 1;
            z-index: 1;
        }

        .card-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 16px;
            position: relative;
            z-index: 2;
            padding-right: 40px;
        }

        .card-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            position: relative;
            z-index: 2;
        }

        /* Stats Section */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
        }

        .stat-item {
            padding: 30px 10px;
            border-right: 1px solid var(--border-color);
        }

        .stat-item:last-child {
            border-right: none;
        }

        .stat-number {
            font-family: var(--font-serif);
            font-size: 3.5rem;
            font-weight: 700;
            line-height: 1;
            margin-bottom: 10px;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-secondary);
            letter-spacing: 1px;
            text-transform: uppercase;
        }

        /* Workflow Steps */
        .workflow-steps {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .step-item {
            display: flex;
            align-items: flex-start;
            gap: 30px;
            padding: 30px;
            border: 1px solid var(--border-color);
            background: #fff;
        }

        .step-num {
            font-family: var(--font-serif);
            font-size: 2rem;
            font-weight: 700;
            background: var(--text-primary);
            color: #fff;
            width: 50px;
            height: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .step-content h4 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }

        /* Table Style */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border: 1px solid var(--border-color);
            margin-top: 20px;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 0.9rem;
        }

        th, td {
            padding: 16px 24px;
            border-bottom: 1px solid var(--border-color);
        }

        th {
            background-color: var(--bg-secondary);
            font-weight: 700;
            text-transform: uppercase;
            font-size: 0.8rem;
            letter-spacing: 1px;
        }

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

        /* FAQ Accordion */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            border: 1px solid var(--border-color);
            background-color: #ffffff;
        }

        .faq-header {
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
        }

        .faq-question {
            font-weight: 700;
            font-size: 1rem;
        }

        .faq-icon {
            font-size: 1.2rem;
            transition: transform 0.3s;
        }

        .faq-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }

        .faq-content {
            padding: 0 24px 20px 24px;
            color: var(--text-secondary);
            font-size: 0.9rem;
            border-top: 1px dashed var(--border-color);
            padding-top: 15px;
        }

        .faq-item.active .faq-body {
            max-height: 300px;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }

        /* Review Cards */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .review-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 30px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .review-text {
            font-style: italic;
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-bottom: 24px;
            position: relative;
        }

        .review-text::before {
            content: "“";
            font-family: var(--font-serif);
            font-size: 4rem;
            color: #eaeaea;
            position: absolute;
            top: -20px;
            left: -10px;
            z-index: 0;
        }

        .review-text p {
            position: relative;
            z-index: 1;
        }

        .review-author {
            display: flex;
            flex-direction: column;
            border-top: 1px solid var(--border-color);
            padding-top: 15px;
        }

        .author-name {
            font-weight: 700;
            font-size: 0.9rem;
        }

        .author-title {
            font-size: 0.8rem;
            color: var(--text-light);
        }

        /* Media Elements */
        .image-showcase {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 20px;
            margin-top: 30px;
        }

        .image-container {
            border: 1px solid var(--border-color);
            padding: 8px;
            background: #fff;
        }

        .image-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: grayscale(100%);
            transition: filter 0.5s;
        }

        .image-container img:hover {
            filter: grayscale(0%);
        }

        /* Form styling */
        .contact-form {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 40px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        label {
            display: block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 6px;
        }

        input, select, textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border-color);
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            font-family: var(--font-sans);
            font-size: 0.9rem;
            transition: all 0.3s;
        }

        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--accent-color);
            background-color: #ffffff;
        }

        /* Tags and Lists */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }

        .tag-item {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            font-size: 0.8rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        /* Double column layout for solutions / details */
        .detail-block {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .detail-item {
            border-left: 3px solid var(--accent-color);
            padding-left: 20px;
        }

        .detail-item h4 {
            font-size: 1.1rem;
            margin-bottom: 6px;
        }

        /* Articles list */
        .articles-list {
            margin-top: 24px;
        }
        
        .article-card {
            border-bottom: 1px solid var(--border-color);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .article-card:last-child {
            border-bottom: none;
        }

        .article-title {
            font-weight: 700;
            font-size: 1.05rem;
        }

        /* Footer */
        footer {
            background-color: var(--bg-dark);
            color: #ffffff;
            padding: 60px 0 30px 0;
            font-size: 0.85rem;
            border-top: 3px solid var(--accent-color);
        }

        footer a {
            color: #bbbbbb;
        }

        footer a:hover {
            color: #ffffff;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h5 {
            font-family: var(--font-serif);
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid #333;
            padding-bottom: 10px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 15px;
        }

        .friend-links a {
            background: #222;
            padding: 4px 10px;
            border: 1px solid #333;
            font-size: 0.75rem;
        }

        .footer-bottom {
            border-top: 1px solid #222;
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-light);
        }

        /* Float QR Box */
        .float-qr {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #ffffff;
            border: 2px solid var(--accent-color);
            padding: 15px;
            z-index: 999;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
        }

        .float-qr img {
            width: 100px;
            height: 100px;
        }

        .float-qr span {
            font-size: 0.75rem;
            font-weight: 700;
            text-transform: uppercase;
        }

        .float-qr-close {
            position: absolute;
            top: -10px;
            right: -10px;
            background: #000;
            color: #fff;
            border-radius: 50%;
            width: 20px;
            height: 20px;
            font-size: 0.7rem;
            line-height: 20px;
            cursor: pointer;
            font-weight: bold;
        }

        /* Tooltip and calculators */
        .interactive-tool {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            padding: 30px;
            margin-top: 20px;
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-4, .stats-grid, .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .reviews-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 80px;
                left: 0;
                width: 100%;
                background: #ffffff;
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                gap: 15px;
            }

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

            .menu-toggle {
                display: flex;
            }

            .hero h1 {
                font-size: 2.2rem;
            }

            .grid-2, .grid-3, .grid-4, .stats-grid, .footer-grid {
                grid-template-columns: 1fr;
            }

            .form-row {
                grid-template-columns: 1fr;
            }

            .image-showcase {
                grid-template-columns: 1fr;
            }
            
            .float-qr {
                bottom: 20px;
                right: 20px;
                padding: 10px;
            }
            
            .float-qr img {
                width: 80px;
                height: 80px;
            }
        }