:root {
            --bg: #ffffff;
            --bg-alt: #f5f5f7;
            --text: #1d1d1f;
            --text-secondary: #6e6e73;
            --accent: #e6a800;
            --accent-light: #fff3cc;
            --card-bg: #ffffff;
            --card-border: rgba(0, 0, 0, 0.06);
            --card-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
            --hero-gradient: linear-gradient(160deg, #fffbe6 0%, #fff9d6 30%, #ffffff 70%);
            --badge-bg: #f0f0f0;
            --divider: rgba(0, 0, 0, 0.08);
            --relation-pill-bg: #ece5ca;
            --relation-pill-text: #c9a017;
        }

        @media (prefers-color-scheme: dark) {
            :root {
                --bg: #000000;
                --bg-alt: #1c1c1e;
                --text: #f5f5f7;
                --text-secondary: #a1a1a6;
                --accent: #ffd60a;
                --accent-light: #332b00;
                --card-bg: #1c1c1e;
                --card-border: rgba(255, 255, 255, 0.08);
                --card-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
                --hero-gradient: linear-gradient(160deg, #1a1700 0%, #121000 30%, #000000 70%);
                --badge-bg: #2c2c2e;
                --divider: rgba(255, 255, 255, 0.1);
                --relation-pill-bg: #565037;
                --relation-pill-text: #c8ab01;
            }
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Screenshot: light/dark variants */
        .phone-screenshot img { display: none; }
        .phone-screenshot .screenshot-light { display: block; }

        /* Navigation */
        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            padding: 16px 24px;
            background: var(--bg);
            opacity: 0.95;
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--divider);
        }

        nav .nav-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        nav .logo {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        nav .logo .logo-icon {
            display: inline-block;
            width: 32px;
            height: 32px;
            border-radius: 8px;
            overflow: hidden;
        }

        nav .logo .logo-icon img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        nav .logo .logo-icon .icon-light {
            display: block;
        }

        nav .logo .logo-icon .icon-dark {
            display: none;
        }

        @media (prefers-color-scheme: dark) {
            nav .logo .logo-icon .icon-light {
                display: none;
            }

            nav .logo .logo-icon .icon-dark {
                display: block;
            }
        }

        nav ul {
            list-style: none;
            display: flex;
            gap: 32px;
        }

        nav ul li a {
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 0.9rem;
            font-weight: 500;
            transition: color 0.2s;
        }

        nav ul li a:hover {
            color: var(--accent);
        }

        /* Hero */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 120px 24px 80px;
            background: var(--hero-gradient);
            position: relative;
        }

        .hero::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(to bottom, transparent, var(--bg));
        }

        .hero-content {
            max-width: 1080px;
            width: 100%;
        }

        .hero-content > .hero-badge,
        .hero-content > h1,
        .hero-content > p {
            max-width: 720px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-badge {
            display: inline-block;
            background: var(--badge-bg);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .hero h1 {
            font-size: clamp(2.5rem, 7vw, 4.5rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 24px;
            letter-spacing: -0.02em;
        }

        .hero h1 .highlight {
            color: var(--accent);
        }

        .hero p {
            font-size: clamp(1.1rem, 2.5vw, 1.35rem);
            color: var(--text-secondary);
            max-width: 645px;
            margin: 0 auto 40px;
            line-height: 1.5;
        }

        .hero-stage {
            margin-top: 56px;
            display: flex;
            justify-content: center;
            max-width: 480px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-visual {
            position: relative;
        }

        .phone-screenshot {
            margin: 0 auto;
            max-width: 300px;
            filter: drop-shadow(0 20px 60px rgba(0, 0, 0, 0.15));
        }

        .phone-screenshot img {
            width: 100%;
            height: auto;
        }


        @media (prefers-color-scheme: dark) {
            .phone-screenshot {
                filter: drop-shadow(0 20px 60px rgba(0, 0, 0, 0.4));
            }

            .phone-screenshot .screenshot-light { display: none; }
            .phone-screenshot .screenshot-dark { display: block; }
        }

        /* Hero benefit pills */
        .hero-pills {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            max-width: 980px;
            margin: 64px auto 0;
        }

        .hero-pill {
            display: flex;
            gap: 14px;
            align-items: flex-start;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 18px;
            padding: 22px 20px;
            text-align: left;
            box-shadow: var(--card-shadow);
        }

        .hero-pill .pill-icon {
            font-size: 1.7rem;
            line-height: 1;
            flex-shrink: 0;
        }

        .hero-pill .pill-title {
            font-weight: 600;
            font-size: 0.98rem;
            color: var(--text);
            margin-bottom: 6px;
            line-height: 1.3;
        }

        .hero-pill .pill-text {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        @media (max-width: 900px) {
            .hero-stage {
                max-width: 480px;
            }

            .hero-pills {
                grid-template-columns: 1fr;
                gap: 12px;
                max-width: 480px;
            }
        }

        /* Sections */
        section {
            padding: 100px 24px;
        }

        .section-header {
            text-align: center;
            max-width: 980px;
            margin: 0 auto 64px;
        }

        .section-header h2 {
            font-size: clamp(1.8rem, 4vw, 2.8rem);
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }

        .section-header p {
            font-size: 1.1rem;
            color: var(--text-secondary);
        }

        /* Problem Section */
        .problem {
            background: var(--bg-alt);
        }

        .problem-grid {
            max-width: 900px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 24px;
        }

        .problem-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 20px;
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--card-shadow);
        }

        .problem-card .icon {
            font-size: 2.5rem;
            margin-bottom: 16px;
        }

        .problem-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .problem-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* Core Feature */
        .core-feature {
            background: var(--bg);
        }

        .core-content {
            max-width: 1000px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
        }

        .core-text h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .core-text p {
            font-size: 1rem;
            color: var(--text-secondary);
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .core-diagram {
            background: var(--bg-alt);
            border-radius: 24px;
            padding: 40px 32px;
            border: 1px solid var(--card-border);
        }

        .diagram-article {
            text-align: center;
            margin-bottom: 24px;
        }

        .diagram-article span {
            display: inline-block;
            background: var(--accent-light);
            color: var(--accent);
            padding: 8px 20px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 0.95rem;
        }

        .diagram-lines {
            display: flex;
            justify-content: center;
            gap: 4px;
            margin-bottom: 16px;
        }

        .diagram-line {
            width: 2px;
            height: 40px;
            background: var(--accent);
            opacity: 0.5;
            border-radius: 1px;
        }

        .diagram-shops {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .diagram-shop {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            padding: 8px 16px;
            border-radius: 10px;
            font-size: 0.85rem;
            font-weight: 500;
        }

        /* Features Grid */
        .features {
            background: var(--bg-alt);
        }

        .features-grid {
            max-width: 1100px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }

        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 20px;
            padding: 36px 28px;
            box-shadow: var(--card-shadow);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 40px rgba(0, 0, 0, 0.1);
        }

        .feature-card .feature-icon {
            width: 48px;
            height: 48px;
            background: var(--accent-light);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 20px;
        }

        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* How it works */
        .how-it-works {
            background: var(--bg);
        }

        .steps {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .step {
            display: flex;
            gap: 24px;
            align-items: flex-start;
            position: relative;
            padding-bottom: 48px;
        }

        .step:last-child {
            padding-bottom: 0;
        }

        .step-number {
            width: 48px;
            height: 48px;
            flex-shrink: 0;
            background: var(--accent);
            color: #000;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
            position: relative;
            z-index: 1;
        }

        .step::before {
            content: "";
            position: absolute;
            left: 23px;
            top: 48px;
            bottom: 0;
            width: 2px;
            background: var(--divider);
        }

        .step:last-child::before {
            display: none;
        }

        .step-content h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 6px;
            padding-top: 10px;
        }

        .step-content p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* Sharing Section */
        .sharing {
            background: var(--bg-alt);
            text-align: center;
        }

        .sharing-visual {
            max-width: 600px;
            margin: 0 auto;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 24px;
            padding: 48px 32px;
            box-shadow: var(--card-shadow);
        }

        .sharing-icons {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 24px;
            margin-bottom: 24px;
            font-size: 2rem;
        }

        .sharing-icons .arrow {
            font-size: 1.5rem;
            color: var(--accent);
        }

        .sharing-visual h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .sharing-visual p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            max-width: 400px;
            margin: 0 auto;
        }

        /* Design DNA / Blueprint */
        .design-dna {
            background:
                radial-gradient(ellipse at top, #1e3f6b 0%, #0d2240 60%, #07182e 100%);
            color: #e8efff;
            position: relative;
            overflow: hidden;
            padding: 120px 24px;
        }

        .design-dna::before {
            content: "";
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
            background-size: 40px 40px;
            mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
            -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
            pointer-events: none;
        }

        .design-dna .section-header {
            position: relative;
            z-index: 1;
        }

        .design-dna .design-tag {
            display: inline-block;
            font-family: "SF Mono", "Menlo", "Consolas", monospace;
            font-size: 0.75rem;
            letter-spacing: 0.2em;
            color: #7fb3ff;
            border: 1px solid rgba(127, 179, 255, 0.4);
            padding: 6px 14px;
            border-radius: 4px;
            margin-bottom: 20px;
            text-transform: uppercase;
        }

        .design-dna .section-header h2 {
            color: #ffffff;
        }

        .design-dna .section-header p {
            color: #a8c2e8;
        }

        .blueprint-frame {
            max-width: 720px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
            border-radius: 16px;
            overflow: hidden;
            box-shadow:
                0 0 0 1px rgba(127, 179, 255, 0.2),
                0 30px 80px rgba(0, 0, 0, 0.6),
                0 0 100px rgba(30, 100, 200, 0.15);
        }

        .blueprint-frame img {
            display: block;
            width: 100%;
            height: auto;
        }

        .blueprint-corner {
            position: absolute;
            width: 18px;
            height: 18px;
            border: 1.5px solid rgba(127, 179, 255, 0.6);
            z-index: 2;
            pointer-events: none;
        }

        .blueprint-corner.tl { top: -6px; left: -6px; border-right: none; border-bottom: none; }
        .blueprint-corner.tr { top: -6px; right: -6px; border-left: none; border-bottom: none; }
        .blueprint-corner.bl { bottom: -6px; left: -6px; border-right: none; border-top: none; }
        .blueprint-corner.br { bottom: -6px; right: -6px; border-left: none; border-top: none; }

        .blueprint-wrapper {
            max-width: 720px;
            margin: 0 auto;
            position: relative;
        }

        .design-caption {
            max-width: 600px;
            margin: 32px auto 0;
            text-align: center;
            font-family: "SF Mono", "Menlo", "Consolas", monospace;
            font-size: 0.8rem;
            letter-spacing: 0.05em;
            color: #7fb3ff;
            opacity: 0.7;
            position: relative;
            z-index: 1;
        }

        @media (max-width: 768px) {
            .design-dna {
                padding: 80px 20px;
            }
        }

        /* FAQ Section */
        .faq {
            background: var(--bg);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-list details {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 16px;
            margin-bottom: 12px;
            box-shadow: var(--card-shadow);
            overflow: hidden;
        }

        .faq-list details summary {
            padding: 20px 24px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .faq-list details summary::-webkit-details-marker {
            display: none;
        }

        .faq-list details summary::after {
            content: "+";
            font-size: 1.4rem;
            font-weight: 300;
            color: var(--text-secondary);
            flex-shrink: 0;
            transition: transform 0.2s;
        }

        .faq-list details[open] summary::after {
            content: "\2212";
        }

        .faq-list details .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .faq-list details .faq-answer code {
            font-family: "SF Mono", "Menlo", "Consolas", monospace;
            font-size: 0.88em;
            background: var(--bg-alt);
            padding: 2px 6px;
            border-radius: 5px;
            color: var(--text);
            border: 1px solid var(--card-border);
        }

        .faq-list details .faq-answer ul {
            list-style: disc;
            padding-left: 22px;
            margin: 10px 0;
        }

        .faq-list details .faq-answer ul li {
            margin-bottom: 6px;
        }

        .faq-list details .faq-answer ul li:last-child {
            margin-bottom: 0;
        }

        .faq-list details .faq-answer strong {
            color: var(--text);
        }

        /* Contact Section */
        .contact {
            background: var(--bg-alt);
            text-align: center;
        }

        .contact-card {
            max-width: 600px;
            margin: 0 auto;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 24px;
            padding: 48px 32px;
            box-shadow: var(--card-shadow);
        }

        .contact-icon {
            font-size: 3rem;
            margin-bottom: 20px;
        }

        .contact-card h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .contact-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-bottom: 24px;
            line-height: 1.6;
        }

        .contact-card a.email-link {
            display: inline-block;
            background: var(--accent);
            color: #000;
            padding: 14px 32px;
            border-radius: 14px;
            font-weight: 600;
            font-size: 1.05rem;
            text-decoration: none;
            transition: opacity 0.2s;
        }

        .contact-card a.email-link:hover {
            opacity: 0.85;
        }

        /* CTA */
        .cta {
            background: var(--hero-gradient);
            text-align: center;
            padding: 120px 24px;
        }

        .cta h2 {
            font-size: clamp(2rem, 5vw, 3rem);
            font-weight: 800;
            margin-bottom: 16px;
        }

        .cta p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 40px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .app-store-badge {
            display: inline-block;
            transition: opacity 0.2s, transform 0.2s;
        }

        .app-store-badge:hover {
            opacity: 0.85;
            transform: translateY(-2px);
        }

        .app-store-badge img {
            display: block;
            height: 56px;
            width: auto;
        }

        .app-store-badge .badge-light { display: block; }
        .app-store-badge .badge-dark { display: none; }

        @media (prefers-color-scheme: dark) {
            .app-store-badge .badge-light { display: none; }
            .app-store-badge .badge-dark { display: block; }
        }

        .hero-app-store {
            display: block;
            width: max-content;
            margin: 32px auto 0;
        }

        .hero-app-store img {
            height: 52px;
        }

        /* Footer */
        footer {
            background: var(--bg-alt);
            padding: 40px 24px;
            text-align: center;
            border-top: 1px solid var(--divider);
        }

        footer .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 16px;
        }

        footer .footer-brand {
            font-weight: 700;
            font-size: 1rem;
        }

        footer .footer-links {
            display: flex;
            gap: 24px;
        }

        footer .footer-links a {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 0.85rem;
            transition: color 0.2s;
        }

        footer .footer-links a:hover {
            color: var(--accent);
        }

        footer .footer-copy {
            font-size: 0.8rem;
            color: var(--text-secondary);
        }

        /* Responsive */
        @media (max-width: 768px) {
            nav ul {
                display: none;
            }

            .hero {
                padding: 100px 20px 60px;
                min-height: auto;
            }

            .hero-visual {
                margin-top: 40px;
            }

            .phone-screenshot {
                max-width: 260px;
            }

            section {
                padding: 72px 20px;
            }

            .core-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }

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

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

            .step {
                gap: 16px;
            }

            .sharing-icons {
                font-size: 1.5rem;
                gap: 16px;
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 2.2rem;
            }

            .phone-screenshot {
                max-width: 220px;
            }

            .diagram-shops {
                flex-direction: column;
                align-items: center;
            }
        }

        /* Animations */
        @media (prefers-reduced-motion: no-preference) {
            .feature-card,
            .problem-card,
            .step,
            .core-content,
            .sharing-visual,
            .blueprint-wrapper,
            .contact-card {
                opacity: 0;
                transform: translateY(20px);
                animation: fadeUp 0.6s ease forwards;
            }

            .feature-card:nth-child(1) { animation-delay: 0.1s; }
            .feature-card:nth-child(2) { animation-delay: 0.2s; }
            .feature-card:nth-child(3) { animation-delay: 0.3s; }
            .feature-card:nth-child(4) { animation-delay: 0.4s; }
            .feature-card:nth-child(5) { animation-delay: 0.5s; }
            .feature-card:nth-child(6) { animation-delay: 0.6s; }

            .step:nth-child(1) { animation-delay: 0.1s; }
            .step:nth-child(2) { animation-delay: 0.2s; }
            .step:nth-child(3) { animation-delay: 0.3s; }
            .step:nth-child(4) { animation-delay: 0.4s; }

            @keyframes fadeUp {
                to {
                    opacity: 1;
                    transform: translateY(0);
                }
            }
        }

        /* Article Types Section (Das Kernprinzip) */
        .article-types {
            background: var(--bg);
        }

        .article-types-summary,
        .workflow-summary,
        .section-summary-list {
            width: fit-content;
            max-width: 100%;
            margin: 0 auto;
            padding-left: 1.4em;
            color: var(--text-secondary);
            font-size: 1.1rem;
            line-height: 1.6;
            text-align: left;
        }

        .article-types-summary li + li,
        .workflow-summary li + li,
        .section-summary-list li + li {
            margin-top: 4px;
        }

        .article-types-grid {
            max-width: 1000px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .type-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 20px;
            padding: 32px 28px;
            box-shadow: var(--card-shadow);
        }

        .type-badge {
            display: inline-block;
            padding: 5px 14px;
            border-radius: 999px;
            font-size: 0.72rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            margin-bottom: 18px;
            text-transform: uppercase;
            background: var(--accent-light);
            color: var(--accent);
        }

        .type-badge-once {
            background: rgba(220, 80, 80, 0.12);
            color: #c2403d;
        }

        .type-badge-checklist {
            background: rgba(60, 140, 220, 0.12);
            color: #1f6fc0;
        }

        @media (prefers-color-scheme: dark) {
            .type-badge-once {
                background: rgba(255, 110, 110, 0.18);
                color: #ff8585;
            }
            .type-badge-checklist {
                background: rgba(110, 180, 255, 0.18);
                color: #79b6ff;
            }
        }

        .type-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
            line-height: 1.3;
        }

        .type-card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        @media (max-width: 900px) {
            .article-types-grid {
                grid-template-columns: 1fr;
                max-width: 480px;
            }
        }

        /* Export / Import / Backup Section */
        .export-import {
            background: var(--bg);
        }

        .export-diagram-wrapper {
            max-width: 700px;
            margin: 0 auto 56px;
        }

        .export-diagram {
            width: 100%;
            height: auto;
            display: block;
        }

        .export-diagram .exp-format-box {
            fill: var(--card-bg);
            stroke: var(--card-border);
            stroke-width: 1.5;
        }

        .export-diagram .exp-format-label {
            fill: var(--text);
            font-size: 22px;
            font-weight: 700;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
            text-anchor: middle;
        }

        .export-diagram .exp-format-label-mono {
            fill: var(--text);
            font-size: 14px;
            font-weight: 600;
            font-family: "SF Mono", "Menlo", "Consolas", monospace;
            text-anchor: middle;
        }

        .export-diagram .exp-format-sublabel {
            fill: var(--text-secondary);
            font-size: 10px;
            font-weight: 600;
            font-family: -apple-system, BlinkMacSystemFont, sans-serif;
            text-anchor: middle;
            letter-spacing: 0.12em;
        }

        .export-diagram .exp-list-box {
            fill: var(--card-bg);
            stroke: var(--card-border);
            stroke-width: 1.5;
        }

        .export-diagram .exp-list-header {
            fill: var(--accent-light);
        }

        .export-diagram .exp-bullet {
            fill: var(--accent);
        }

        .export-diagram .exp-line {
            fill: var(--divider);
        }

        .export-diagram .exp-arrow {
            stroke: var(--text-secondary);
            stroke-width: 1.6;
            fill: none;
            opacity: 0.75;
        }

        .export-diagram .exp-arrow-head {
            fill: var(--text-secondary);
            opacity: 0.75;
        }

        .export-diagram-legend {
            display: flex;
            justify-content: center;
            gap: 32px;
            margin-top: 20px;
            font-size: 0.82rem;
            color: var(--text-secondary);
            font-weight: 500;
            letter-spacing: 0.04em;
        }

        .export-diagram-legend .exp-legend-item {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .export-diagram-legend .exp-legend-arrow {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: var(--bg-alt);
            border: 1px solid var(--card-border);
            color: var(--text);
            font-size: 0.95rem;
            font-weight: 700;
            line-height: 1;
        }

        .export-cards {
            max-width: 1100px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .export-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 20px;
            padding: 32px 28px;
            box-shadow: var(--card-shadow);
        }

        .export-card-icon {
            width: 48px;
            height: 48px;
            background: var(--accent-light);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 18px;
        }

        .export-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .export-card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .export-card p strong {
            color: var(--text);
            font-weight: 600;
        }

        .export-card code {
            font-family: "SF Mono", "Menlo", "Consolas", monospace;
            font-size: 0.85em;
            background: var(--bg-alt);
            padding: 2px 6px;
            border-radius: 5px;
            color: var(--text);
            border: 1px solid var(--card-border);
        }

        @media (max-width: 900px) {
            .export-cards {
                grid-template-columns: 1fr;
                max-width: 480px;
            }

            .export-diagram-legend {
                gap: 20px;
            }
        }

        /* Refined shared layout */
        :root {
            --nav-offset: 76px;
        }

        html {
            scroll-padding-top: var(--nav-offset);
        }

        section[id] {
            scroll-margin-top: var(--nav-offset);
        }

        img {
            max-width: 100%;
        }

        .skip-link {
            position: fixed;
            top: 8px;
            left: 12px;
            z-index: 1000;
            padding: 10px 14px;
            border-radius: 10px;
            background: var(--bg);
            color: var(--text);
            border: 1px solid var(--card-border);
            text-decoration: none;
            transform: translateY(-160%);
        }

        .skip-link:focus {
            transform: translateY(0);
        }

        a:focus-visible,
        summary:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 4px;
        }

        nav .nav-inner {
            max-width: 1240px;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 24px;
            min-width: 0;
        }

        nav ul.nav-links {
            gap: clamp(14px, 2vw, 28px);
        }

        .language-switch {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 40px;
            min-height: 34px;
            padding: 5px 10px;
            border: 1px solid var(--card-border);
            border-radius: 999px;
            background: var(--bg-alt);
            color: var(--text);
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.04em;
            text-decoration: none;
        }

        .language-switch:hover {
            color: var(--accent);
        }

        .hero-content {
            position: relative;
            z-index: 1;
        }

        .trust-strip {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px;
            max-width: 820px;
            margin: 54px auto 0;
        }

        .trust-strip span {
            padding: 8px 14px;
            border-radius: 999px;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            box-shadow: var(--card-shadow);
            color: var(--text-secondary);
            font-size: 0.83rem;
            font-weight: 600;
        }

        .relation-map {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 7px;
            margin-top: 20px;
            font-size: 0.78rem;
            line-height: 1.35;
        }

        .relation-item,
        .relation-shop {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 7px 12px;
            border-radius: 999px;
            border: none;
            background: var(--relation-pill-bg);
            color: var(--relation-pill-text);
            font-weight: 600;
            white-space: nowrap;
        }

        .relation-shops {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 7px;
        }

        .relation-arrow {
            color: var(--accent);
            font-size: 1.15rem;
            font-weight: 800;
            line-height: 1;
        }

        .setup-step,
        .workflow-note {
            max-width: 900px;
            margin: 0 auto 32px;
            padding: 26px 28px;
            border: 1px solid var(--card-border);
            border-radius: 20px;
            background: var(--bg-alt);
        }

        .setup-step {
            display: flex;
            align-items: flex-start;
            gap: 20px;
        }

        .setup-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex: 0 0 42px;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--accent);
            color: #000;
            font-weight: 800;
        }

        .setup-step h3,
        .workflow-card h3,
        .feature-spotlight h3 {
            line-height: 1.3;
            margin-bottom: 8px;
        }

        .setup-step p,
        .workflow-card p,
        .workflow-note p,
        .spotlight-copy p {
            color: var(--text-secondary);
        }

        .workflow-showcase {
            display: grid;
            grid-template-columns: minmax(210px, 0.72fr) minmax(560px, 1.9fr) minmax(210px, 0.72fr);
            align-items: start;
            gap: 22px;
            max-width: 1240px;
            margin: 0 auto 32px;
        }

        .workflow-card {
            min-width: 0;
            overflow: hidden;
            border: 1px solid var(--card-border);
            border-radius: 22px;
            background: var(--card-bg);
            box-shadow: var(--card-shadow);
        }

        .workflow-card--shopping {
            position: relative;
            border: 2px solid var(--accent);
            box-shadow: 0 18px 60px rgba(0, 0, 0, 0.14);
            transform: translateY(-12px);
        }

        .theme-screenshot,
        .theme-screenshot img {
            display: block;
            width: 100%;
            height: auto;
        }

        .workflow-card--support > .theme-screenshot {
            border-bottom: 1px solid var(--card-border);
        }

        .workflow-card-copy {
            padding: 24px 22px 26px;
        }

        .workflow-card-copy--shopping {
            padding: 28px 28px 20px;
        }

        .workflow-card-copy--shopping h3 {
            font-size: clamp(1.45rem, 2.6vw, 2rem);
        }

        .shopping-compare {
            display: grid;
            grid-template-columns: minmax(0, 1fr) minmax(72px, 92px) minmax(0, 1fr);
            align-items: center;
            gap: 10px;
            padding: 0 24px 24px;
        }

        .shopping-state {
            min-width: 0;
        }

        .shopping-state figcaption {
            min-height: 58px;
            margin-bottom: 12px;
            text-align: center;
        }

        .shopping-state figcaption strong,
        .shopping-state figcaption span {
            display: block;
        }

        .shopping-state figcaption strong {
            color: var(--text);
            font-size: 0.88rem;
        }

        .shopping-state figcaption span {
            color: var(--text-secondary);
            font-size: 0.74rem;
            line-height: 1.35;
        }

        .shopping-state-media,
        .shopping-state-media img {
            display: block;
            width: 100%;
            height: auto;
        }

        .shopping-transition {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 8px;
            color: var(--accent);
            text-align: center;
            font-size: 0.72rem;
            font-weight: 800;
            line-height: 1.35;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .shopping-transition b {
            font-size: 1.8rem;
            line-height: 1;
        }

        .shopping-customization {
            margin: 0 28px 28px;
            padding-top: 18px;
            border-top: 1px solid var(--card-border);
            font-size: 0.82rem;
            line-height: 1.55;
            text-align: center;
        }

        .step-label,
        .section-kicker {
            display: block;
            margin-bottom: 10px;
            color: var(--accent);
            font-size: 0.75rem;
            font-weight: 800;
            letter-spacing: 0.06em;
            text-transform: uppercase;
        }

        .workflow-note {
            margin-bottom: 0;
            text-align: center;
        }

        .feature-spotlight,
        .data-layout {
            max-width: 1100px;
            margin: 56px auto 0;
            display: grid;
            align-items: center;
            gap: 54px;
            padding: 44px;
            border: 1px solid var(--card-border);
            border-radius: 28px;
            background: var(--card-bg);
            box-shadow: var(--card-shadow);
        }

        .feature-spotlight {
            grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.28fr);
        }

        .spotlight-media {
            width: min(100%, 360px);
            justify-self: center;
            overflow: hidden;
            border-radius: 20px;
        }

        .spotlight-copy h3 {
            font-size: clamp(1.5rem, 3vw, 2.15rem);
        }

        .spotlight-copy ul {
            margin: 24px 0 0;
            padding-left: 20px;
            color: var(--text-secondary);
        }

        .spotlight-copy li + li {
            margin-top: 8px;
        }

        .data-layout {
            grid-template-columns: minmax(220px, 0.62fr) minmax(0, 1.38fr);
            margin-top: 0;
        }

        .data-media {
            width: min(100%, 320px);
            justify-self: center;
            overflow: hidden;
            border-radius: 20px;
        }

        .data-card-list {
            display: grid;
            gap: 16px;
        }

        .data-card-list .export-card {
            padding: 24px;
        }

        .data-card-list .export-card-icon {
            float: left;
            margin: 0 18px 8px 0;
        }

        .data-card-list .export-card p {
            clear: both;
        }

        .faq-group-title {
            margin: 42px 4px 14px;
            color: var(--text-secondary);
            font-size: 0.78rem;
            font-weight: 800;
            letter-spacing: 0.08em;
            text-transform: uppercase;
        }

        .faq-group-title:first-child {
            margin-top: 0;
        }

        .faq-answer p + p {
            margin-top: 12px;
        }

        .contact-card a.email-link {
            max-width: 100%;
            overflow-wrap: anywhere;
        }

        @media (max-width: 1080px) {
            .workflow-showcase {
                grid-template-columns: 1fr;
                max-width: 800px;
            }

            .workflow-card--shopping {
                transform: none;
            }

            .workflow-card--support {
                display: grid;
                grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
                align-items: center;
            }

            .workflow-card--support > .theme-screenshot {
                border-right: 1px solid var(--card-border);
                border-bottom: 0;
            }
        }

        @media (max-width: 960px) {
            :root {
                --nav-offset: 114px;
            }

            nav {
                padding: 10px 16px 8px;
            }

            nav .nav-inner {
                display: grid;
                grid-template-columns: minmax(0, 1fr) auto;
                gap: 8px 12px;
            }

            nav .logo {
                grid-column: 1;
                grid-row: 1;
                width: max-content;
            }

            .nav-actions {
                display: contents;
            }

            .language-switch {
                grid-column: 2;
                grid-row: 1;
            }

            nav ul.nav-links {
                grid-column: 1 / -1;
                grid-row: 2;
                display: flex;
                width: 100%;
                gap: 20px;
                overflow-x: auto;
                padding: 2px 1px 4px;
                scrollbar-width: none;
            }

            nav ul.nav-links::-webkit-scrollbar {
                display: none;
            }

            nav ul.nav-links li {
                flex: 0 0 auto;
            }

            .hero {
                padding-top: 156px;
            }
        }

        @media (max-width: 820px) {
            .feature-spotlight,
            .data-layout {
                grid-template-columns: 1fr;
                gap: 32px;
                padding: 28px;
            }

            .spotlight-media,
            .data-media {
                width: min(100%, 280px);
            }
        }

        @media (max-width: 640px) {
            .hero {
                padding-top: 146px;
            }

            nav ul.nav-links {
                gap: 10px;
            }

            nav ul.nav-links li a {
                font-size: 0.76rem;
                white-space: nowrap;
            }

            .hero-stage {
                margin-top: 42px;
            }

            .trust-strip {
                margin-top: 40px;
            }

            .setup-step {
                padding: 22px 20px;
            }

            .workflow-card--support {
                grid-template-columns: minmax(125px, 38%) minmax(0, 1fr);
            }

            .workflow-card--support .workflow-card-copy {
                padding: 20px 18px 22px;
            }

            .workflow-card-copy--shopping {
                padding: 24px 20px 18px;
            }

            .shopping-compare {
                grid-template-columns: 1fr;
                gap: 16px;
                padding: 0 16px 22px;
            }

            .shopping-state {
                width: min(100%, 280px);
                margin: 0 auto;
            }

            .shopping-state figcaption {
                min-height: 0;
                margin-bottom: 10px;
            }

            .shopping-transition {
                gap: 4px;
            }

            .shopping-transition b {
                transform: rotate(90deg);
            }

            .shopping-customization {
                margin: 0 20px 24px;
            }

            .feature-spotlight,
            .data-layout {
                margin-top: 40px;
                padding: 22px 18px;
                border-radius: 22px;
            }

            .contact-card a.email-link {
                padding-left: 18px;
                padding-right: 18px;
                font-size: 0.96rem;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            html {
                scroll-behavior: auto;
            }

            .feature-card,
            .app-store-badge {
                transition: none;
            }
        }